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WO2012026246A1 - Wireless communication system, communication control apparatus, communication terminal apparatus and control program - Google Patents

Wireless communication system, communication control apparatus, communication terminal apparatus and control program Download PDF

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Publication number
WO2012026246A1
WO2012026246A1 PCT/JP2011/066475 JP2011066475W WO2012026246A1 WO 2012026246 A1 WO2012026246 A1 WO 2012026246A1 JP 2011066475 W JP2011066475 W JP 2011066475W WO 2012026246 A1 WO2012026246 A1 WO 2012026246A1
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WIPO (PCT)
Prior art keywords
communication
signal
frequency
communication terminal
retransmission
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PCT/JP2011/066475
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French (fr)
Japanese (ja)
Inventor
一成 横枕
泰弘 浜口
中村 理
淳悟 後藤
高橋 宏樹
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シャープ株式会社
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Publication of WO2012026246A1 publication Critical patent/WO2012026246A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation
    • H04L5/0041Frequency-non-contiguous
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management

Definitions

  • the present invention relates to a signal retransmission method in which duplication is permitted when communication is performed by duplicating signals using at least some of the same frequencies at the same time.
  • LTE-A Long Term Evolution-Advanced
  • IMT-A International Mobile Broadband
  • the SC-FDMA spectrum is divided into clusters composed of a plurality of subcarriers, and each cluster is arbitrarily assigned on the frequency axis.
  • Clustered DFT-S-OFDM also called Dynamic Spectrum Control (DSC)
  • SC-ASA SingleCarrier Adaptive Adaptive Spectrum Allocation
  • SORM spectrum overlap resource management
  • FIG. 9 is a diagram illustrating an example of a SORM.
  • SORM is applied to an uplink that can detect signals of all connected users.
  • an example is shown in which there are two mobile station devices (transmitting device, first communication device) that are simultaneously connected to a base station device (receiving device, second communication device).
  • transmitting device first communication device
  • base station device receiving device, second communication device
  • the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 (hereinafter, the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 are combined, It is assumed that the mobile station device 101) transmits signals arranged on the frequency axis as transmission signal 102-1 and transmission signal 102-2, respectively.
  • the base station apparatus 103 receives each signal.
  • the received signal 104 on the frequency axis at this time is as shown in FIG.
  • the partial spectrum 104-A of the received signal 104 included in the received signal 104 is received in an overlapping manner because both mobile station apparatuses 101-1 and 101-2 have arranged the signal.
  • the transmission signals from the respective mobile station apparatuses can be separated by separating the overlapped signals by turbo equalization.
  • signals from each mobile station apparatus 101 can be separated by turbo equalization technology even if partial spectra overlap. For this reason, in consideration of the fact that they may overlap, it is possible to assign a frequency for transmitting a signal to each mobile station apparatus 101 with priority on the propagation path characteristics, thereby improving the transmission characteristics.
  • Non-Patent Document 2 partial spectrum retransmission control (Non-Patent Document 2) has been proposed as a single carrier retransmission method.
  • Non-Patent Document 2 it is described that only the signal spectrum of the frequency whose propagation path characteristics are significantly deteriorated in the initial transmission is described, but there is no description regarding the SORM, and the cause of the deterioration in the characteristics of the SORM is due to duplication. Considering this, there is a problem that efficient retransmission cannot be performed even if the method of this document is used.
  • the present invention has been made in view of such circumstances, and wireless communication that enables efficient retransmission in the case of performing communication by overlapping signals using at least some of the same frequencies at the same time.
  • An object is to provide a system, a communication control device, a communication terminal device, and a control program.
  • the wireless communication system of the present invention allows wireless communication that allows some or all of the frequencies used when a plurality of first communication devices transmit wireless signals to the second communication device overlap.
  • the wireless communication system when each of the first communication devices transmits a retransmission signal to the second communication device, only a partial spectrum that is a part of an initial transmission signal is transmitted to the second communication device. It is characterized by transmitting.
  • each first communication device transmits a retransmission signal to the second communication device
  • only the partial spectrum that is a part of the initial transmission signal is transmitted to the second communication device.
  • efficient retransmission can be performed.
  • the partial spectrum is a spectrum arranged at an overlapping frequency when each first communication device transmits an initial transmission signal.
  • the partial spectrum is a spectrum that is arranged at an overlapping frequency when each first communication device transmits the initial transmission signal, the first communication device has at least a part of the same frequency at the same time.
  • efficient retransmission can be performed.
  • the partial spectrum is received in the second communication device by a reception SNR (Signal to Noise power Ratio) or reception of a radio signal received from each of the first communication devices. It is set based on SINR (Signalto
  • the partial spectrum is set in the second communication device based on the reception SNR (SignaltoalNoise power Ratio) or the reception SINR (Signal toInterferenceplus Noise power Ratio) of the radio signal received from each first communication device. Therefore, the second communication device can detect the overlapped partial spectrum from the initial transmission signal included in the control signal.
  • any one of the first communication devices has a partial spectrum arranged at a frequency that does not overlap with a frequency used by any other first communication device. It transmits to said 2nd communication apparatus, It is characterized by the above-mentioned.
  • the first communication device transmits the partial spectrum arranged at a frequency that does not overlap with the frequency used by any other first communication device to the second communication device.
  • efficient retransmission can be performed.
  • a part or all of the frequencies used when a plurality of first communication devices transmit wireless signals to the second communication device are allowed to overlap.
  • the second communication is performed by cyclically shifting the retransmission signal on the frequency axis. It transmits to the apparatus.
  • each first communication device transmits a retransmission signal to the second communication device
  • the retransmission signal is cyclically shifted on the frequency axis and transmitted to the second communication device.
  • the first communication apparatus performs communication by overlapping signals using at least some of the same frequencies at the same time, so that the probability that the same partial spectrum as that of the initial transmission will overlap at the time of retransmission is reduced, so that the retransmission efficiency is improved. Rise.
  • the amount by which the retransmission signal is cyclically shifted on the frequency axis is determined by the first communication device transmitting the initial transmission signal in the second communication device. It is characterized in that it is determined on the basis of spectra arranged at overlapping frequencies.
  • the amount of cyclic shift of the retransmitted signal on the frequency axis is based on the spectrum arranged in the overlapping frequency when each first communication device transmits the initial transmission signal in the second communication device. Therefore, when the first communication apparatus performs communication by overlapping signals using at least a part of the same frequency at the same time, the probability that the same partial spectrum as that of the initial transmission is overlapped at the time of retransmission is low. Therefore, retransmission efficiency is increased.
  • the amount of cyclic shift of the retransmission signal on the frequency axis is the reception of the wireless signal received from each first communication device in the second communication device. It is characterized in that it is set based on SNR (Signal to Noise power Ratio) or received SINR (Signalto Interference plus Noise power Ratio).
  • the amount of cyclic shift of the retransmitted signal on the frequency axis is determined by the reception SNR (Signal to Noise power Ratio) or the reception SINR of the radio signal received from each first communication device in the second communication device. Since it is set based on (Signalto
  • any one of the first communication devices uses a retransmission signal on a frequency axis so as not to overlap with a frequency used by any other first communication device.
  • a cyclic shift is performed above, and transmission is performed to the second communication device.
  • any of the first communication devices cyclically shifts the retransmission signal on the frequency axis so as not to overlap with the frequency used by any other first communication device. Probability of overlapping the same partial spectrum as the initial transmission at the time of retransmission when the first communication device performs communication by overlapping signals using at least a part of the same frequency at the same time because it is transmitted to the communication device Thus reducing the efficiency of retransmission.
  • the communication control apparatus of this invention is a radio
  • a determination unit (corresponding to a data detection / combination unit and an error detection unit) that determines whether or not there is an error in the decoding result of the radio signal received from each communication terminal device. If there is an error as a result of the determination, the communication terminal device includes an overlapping frequency detection unit that detects an overlapping frequency when transmitting an initial transmission signal, and indicates information indicating the detected frequency. And transmitting to each of the communication terminal devices.
  • the communication terminal device detects the overlapping frequency when each communication terminal device transmits the initial transmission signal, so that the communication terminal device at least at the same time.
  • efficient retransmission can be performed.
  • the communication terminal device of the present invention is a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal devices transmit radio signals to the communication control device.
  • a response signal detection unit that detects a response signal received from the communication control device, and the communication control device when the detected response signal is NACK (Negative Acknowledge)
  • NACK Negative Acknowledge
  • a partial spectrum extraction unit that extracts a partial spectrum that is a part of the initial transmission signal based on the information indicating the overlapped frequency received from the mobile station, and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control device. It is characterized by transmitting to.
  • the communication terminal apparatus is a part of the initial transmission signal based on the information indicating the overlapping frequency received from the communication control apparatus. Since the spectrum is extracted and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control apparatus, it is efficient when communication is performed by overlapping signals using at least some of the same frequencies at the same time. Retransmission can be performed.
  • the communication control apparatus of the present invention is a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus. And a determination unit that determines whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices, and if the result of the determination is an error, A cyclic shift calculation unit that calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each of the communication terminal devices.
  • the communication control device calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each communication terminal device. Therefore, in the case where the communication terminal apparatus performs communication by duplicating signals using at least some of the same frequencies at the same time, the probability that the same partial spectrum as that of the initial transmission is duplicated at the time of retransmission is reduced, so that the retransmission efficiency is improved. Rise.
  • the communication terminal device of the present invention is a wireless communication system that allows some or all of the frequencies used when a plurality of communication terminal devices transmit a radio signal to the communication control device.
  • a response signal detection unit that detects a response signal received from the communication control device, and the communication control device when the detected response signal is NACK (Negative Acknowledge)
  • NACK Negative Acknowledge
  • a modulo unit that cyclically shifts the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the transmitter, and transmits the cyclically shifted retransmission signal to the communication control device It is characterized by that.
  • the communication terminal apparatus cyclically transmits the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the communication control apparatus. Since the click-shift is performed and the cyclic-shifted retransmission signal is transmitted to the communication control device, in the case of performing communication by overlapping signals using at least a part of the same frequency at the same time, Since the probability that the same partial spectrum overlaps decreases, retransmission efficiency increases.
  • control program of the present invention is a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit wireless signals to the communication control apparatus.
  • the communication control device detects an overlapped frequency when each communication terminal device transmits the initial transmission signal, and information indicating the detected frequency is set for each communication. Since transmission is performed to the terminal device, efficient retransmission can be performed when the communication terminal device performs communication by overlapping signals using at least some of the same frequencies at the same time.
  • control program of the present invention is a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit wireless signals to the communication control apparatus.
  • a control program for a communication terminal device to be applied in which processing for detecting a response signal received from the communication control device, and when the detected response signal is NACK (Negative Acknowledge), from the communication control device Based on the received information indicating the overlapping frequency, a process of extracting a partial spectrum that is a part of the initial transmission signal, a process of transmitting only the extracted partial spectrum as a retransmission signal to the communication control device, A series of processes is commanded to be readable and executable by a computer.
  • the communication terminal apparatus is a part of the initial transmission signal based on the information indicating the overlapping frequency received from the communication control apparatus. Since the spectrum is extracted and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control apparatus, it is efficient when communication is performed by overlapping signals using at least some of the same frequencies at the same time. Retransmission can be performed.
  • the control program of the present invention is applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus.
  • a series of processes of calculating a cyclic shift amount on the axis and transmitting information indicating the calculated cyclic shift amount to each of the communication terminal devices can be read and executed by a computer. It is characterized by being commanded.
  • the communication control device calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each communication terminal device. Therefore, when the communication terminal apparatus performs communication by overlapping signals using at least a part of the same frequency at the same time, the probability that the same partial spectrum as that of the initial transmission is overlapped at the time of retransmission is reduced, so that retransmission efficiency is increased. .
  • the control program of the present invention is applied to a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus.
  • a communication terminal device control program for detecting a response signal received from the communication control device, and if the detected response signal is NACK (Negative Acknowledge), received from the communication control device A series of processes including a process of cyclically shifting a retransmission signal on the frequency axis based on information indicating a cyclic shift amount, and a process of transmitting the cyclically shifted retransmission signal to the communication control device Is characterized by being commanded to be readable and executable by a computer.
  • the communication terminal apparatus cyclically transmits the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the communication control apparatus. Since the click-shift is performed and the cyclic-shifted retransmission signal is transmitted to the communication control device, in the case of performing communication by overlapping signals using at least a part of the same frequency at the same time, Since the probability that the same partial spectrum overlaps decreases, retransmission efficiency increases.
  • efficient retransmission can be performed in the case where communication is performed by overlapping signals using at least some of the same frequencies at the same time.
  • FIG. 3 is a block diagram showing an example of the configuration of data detection / synthesis units 21-1 to 21-U according to the first embodiment of the present invention. It is a figure which shows an example of the concept of the retransmission method which concerns on the 2nd Embodiment of this invention.
  • FIG. 2 is a block diagram illustrating an example of a basic configuration of a mobile station apparatus 101.
  • FIG. 3 is a block diagram showing a configuration of a base station apparatus 103.
  • MIMO Multiple Input Multiple Output
  • the present invention can be applied if it exists.
  • FIG. 10 is a block diagram illustrating an example of a basic configuration of the mobile station apparatus 101.
  • the mobile station apparatus 101 receives the control signal notified from the base station apparatus 103 on the downlink by the antenna 111, and the radio reception unit 112 down-converts it to a baseband signal and performs A / D conversion.
  • the control signal detection unit 113 detects information (MCS) on the modulation scheme and coding rate necessary for generating the data signal, information on the reference signal sequence, frequency allocation information, etc. To do.
  • MCS information
  • the data signal generation unit 114 first generates a frequency signal of data to be transmitted.
  • the information bit string is subjected to error correction coding based on the information on the MCS, modulation symbols such as QPSK and 16QAM are generated, and converted into frequency signals by DFT.
  • a reference signal (RS) for propagation path estimation is generated by reference signal generation section 115 based on information relating to the series of reference signals, and multiplexed with a data signal in reference signal multiplexing section 116.
  • the frequency allocation unit 117 arranges the frequency based on the frequency allocation information notified by the frequency allocation unit 117, and converts it into a time signal by the IFFT unit 118.
  • the CP insertion unit 119 copies a part of the rear of the time signal forward.
  • the radio transmission unit 120 performs D / A conversion, up-converts the radio frequency, and then transmits from the antenna 111.
  • FIG. 11 is a block diagram showing the configuration of the base station apparatus 103.
  • mobile station apparatus 101 of U station is connected to base station apparatus 103.
  • a reception signal received by the antenna 201 is converted into a baseband signal by the wireless reception unit 202 and then converted into a digital signal.
  • CP is removed by CP removing section 203 and converted into a frequency signal by FFT section 204.
  • the multiplexed reference signal of each mobile station apparatus 101 is separated by reference signal separation section 205, and propagation path characteristics and noise power estimation sections 206-1 to 206-U estimate propagation path characteristics and noise power.
  • units that need to be processed for each mobile station apparatus 101 are marked as * -1 to * -U.
  • the noise includes thermal noise generated in the circuit and interference due to communication of other mobile station apparatuses 101.
  • the received signal from which the reference signal is separated is inter-symbol interference (ISI) caused by the delayed wave of the radio propagation path by the signal canceling unit 207, and interference between users that is caused by different mobile station apparatus 101 signals.
  • ISI inter-symbol interference
  • IUI remove interference
  • the frequency demapping unit 208 separates the signals of each mobile station apparatus 101.
  • the transmission data is detected by the data detection units 209-1 to 209-U.
  • the data detection units 209-1 to 209-U perform equalization processing for suppressing the residual interference components related to ISI and IUI and synthesizing desired signals, and then converting them into the time domain by IDFT, and receiving the received signals of code bits (LLR And error correction decoding is performed. That is, LLRs of information bits and code bits are output from the data detection units 209-1 to 209-U.
  • the LLRs of the obtained code bits are output as expected values (hereinafter referred to as soft estimation) of amplitudes of received signals from the mobile station apparatuses 101 in the soft estimation generation units 210-1 to 210-U.
  • the signal is input again to the signal cancel unit 207.
  • Soft estimation generation sections 210-1 to 210-U calculate the expected value of the amplitude of each modulation symbol called a soft replica from the LLR of the code bit, convert it to a frequency signal by DFT, and each mobile station apparatus 101 transmits The signal is mapped to the same frequency as the frequency assigned at the time. Thereafter, the soft estimation is calculated by multiplying the propagation path characteristics estimated by the propagation path characteristics / noise power estimation units 206-1 to 206-U.
  • the repetition of a series of processes of the signal cancellation unit 207, frequency demapping unit 208, data detection units 209-1 to 209-U, and soft estimation generation units 210-1 to 210-U is generally referred to as a turbo equalization technique. This is repeated an arbitrary number of times, a desired number of times, or until there is no detection error, and the decoded bits are obtained by making a hard decision on the LLR of the information bits output from the data detection units 209-1 to 209-U.
  • a reference signal sequence for MCS, frequency allocation, and other control purposes calculated from the propagation path characteristics of each mobile station apparatus 101 estimated by the propagation path characteristics / noise power estimation units 206-1 to 206-U
  • Control information generators 211-1 to 211 -U generate control information such as information indicating response and response signals, and after D / A conversion and up-conversion to a radio frequency are performed in radio transmission unit 212, antenna 201 To each mobile station apparatus 101.
  • signals from each mobile station apparatus 101 are obtained even if partial spectra overlap by a turbo equalization technique configured from the signal cancel unit 207 to the soft estimation generation units 210-1 to 210-U. Can be separated. For this reason, in consideration of the fact that they may overlap, it is possible to assign a frequency for transmitting a signal to each mobile station apparatus 101 with priority on the propagation path characteristics, thereby improving the transmission characteristics.
  • FIG. 1 is a diagram illustrating an example of a concept of a retransmission method according to the first embodiment of the present invention.
  • the state of the frequency signal is taken as an example, and the number of mobile station apparatuses connected to the base station apparatus 103 at the same time is two.
  • first mobile station apparatus 101-1 and second mobile station apparatus 101-2 arrange and transmit signals on the frequency axis like transmission signal 1 and transmission signal 2 (this is the initial transmission and transmission). Call).
  • the reception signal 3 at this time is expressed as shown in FIG. 1, and the partial spectrum 4 is received in an overlapping manner.
  • the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 perform retransmission processing.
  • the cause of the signal detection error is the overlapping partial spectrum 4
  • Only the partial spectrum 4 that has been transmitted is retransmitted. That is, only the partial spectrum arranged at the position of partial spectrum 4 at the time of initial transmission (partial spectrums 6 and 8 of retransmission signals 5 and 7) is retransmitted.
  • FIG. 2 is a block diagram showing an example of the configuration of the mobile station apparatus 101 according to the first embodiment of the present invention.
  • a response signal detection unit 11, a retransmission signal generation unit 12, a partial spectrum extraction unit 13, and an initial transmission / retransmission switching unit 14 are added to the configuration of FIG.
  • a feature of the embodiment is a partial spectrum extraction unit 13.
  • subjected since it is the same as the function described in FIG. 10, description is abbreviate
  • in the base station apparatus 103 it is assumed that information on the spectrum frequency overlapping with the response signal is multiplexed on the control information.
  • the information bit string is input to the data signal generation unit 114 and simultaneously to the retransmission signal generation unit 12.
  • the response signal detected from the control signal detection unit 113 is input to the response signal detection unit 11 and determines whether it is ACK or NACK.
  • the obtained ACK and NACK information is input to the retransmission signal generation unit 12 and the initial transmission / retransmission switching unit 14.
  • the retransmission signal generation unit 12 if the response signal from the response signal detection unit 11 is NACK, the same frequency signal is generated from the information bit string transmitted at the previous transmission opportunity and input to the partial spectrum extraction unit 13.
  • the partial spectrum extraction unit 13 extracts the overlapping partial spectrum based on the information regarding the frequency of the overlapping spectrum with the initial transmission signal included in the control signal.
  • the frequency of the overlapping spectrum may be based on the received signal-to-noise power ratio (SNR) of the received signal from the mobile station apparatus 101 in the base station apparatus 103. Further, it may be based on SINR (Signal to Interference plus Noise power Ratio) including interference in noise.
  • SINR Signal-to-noise power ratio
  • the initial transmission / retransmission switching unit 14 inputs a signal from the data signal generation unit 114 to the reference signal multiplexing unit 116, and in the case of NACK Switches to input the retransmission signal of the partial spectrum output from the partial spectrum extraction unit 13 to the reference signal multiplexing unit 116.
  • the retransmission signal is generated again from the information bit string. However, since the same signal as the transmission data transmitted at the previous transmission opportunity is generated, the transmission data at the previous transmission opportunity is buffered.
  • the functional block having the function to be stored may be replaced with the retransmission signal generation unit 12.
  • FIG. 3 is a block diagram showing an example of the configuration of the base station apparatus 103 according to the first embodiment of the present invention.
  • the configuration is the same as that of FIG. 11, but the data detection units 209-1 to 209-U of FIG.
  • the data detection / combination units 21-1 to 21-U are collectively replaced with the data detection / synthesis unit 21).
  • error detection units 22-1 to 22-U that detect whether the decoded bit string is correct
  • overlap frequency detection units 23-1 to 23-U that detect information on the frequency of the overlapping spectrum
  • ACK when decoding is correctly performed
  • the response signal generators 24-1 to 24-U that perform NACK when there is an error in the decoding result are different from those in FIG. 11, and the feature of the present embodiment is the overlap frequency detectors 23-1 to 23-U. is there.
  • the received signal from each mobile station apparatus 101 is initially transmitted by the data detection / combination units 21-1 to 21-U, the same processing as the data detection units 209-1 to 209-U in FIG. If so, it is combined with the received signal at the time of initial transmission.
  • the decoded bit strings output from the data detection / combination units 21-1 to 21-U are determined by the error detection units 22-1 to 22-U to determine whether the decoding result is correct, and the determination result is the overlap frequency detection unit 23. -1 to 23-U and response signal generators 24-1 to 24-U.
  • the overlapping frequency detectors 23-1 to 23-U output the frequency position of the overlapping partial spectrum
  • the response signal generators 24-1 to 24-U output ACK or NACK.
  • the information is input to the control information generation units 211-1 to 211-U. Next, the data detection / synthesis units 21-1 to 21-U will be described.
  • FIG. 4 is a block diagram showing an example of the configuration of the data detection / synthesis units 21-1 to 21-U according to the first embodiment of the present invention.
  • the data detection / synthesis unit 21-U includes an equalization unit 31-U, an initial transmission signal holding unit 32-U, a synthesis unit 33-U, a switching unit 34-U, an IDFT unit 35-U, a demodulation unit 36-U, It comprises a decoding unit 37-U.
  • the signal input from the frequency demapping unit 208 is equalized by the equalization unit 31-U.
  • the equalized signal is held until the decoded bit is correctly detected by the initial transmission signal holding unit 32-U. If it is a retransmission signal, the transmission signal at the time of initial transmission held by the initial transmission signal holding unit 32-U is called, and the signal is synthesized by the synthesis unit 33-U. At this time, since the retransmitted signal is a partial spectrum having a bandwidth that is at least equal to the frequency bandwidth of the initial transmission signal, the retransmitted signal is synthesized by combining the frequency positions.
  • N DFT the number of subcarriers in the initial transmission
  • the partial spectrum used for retransmission be the Mth partial spectrum from m of the initial transmission signal.
  • Equation (1) S com (k) is the amplitude of the kth subcarrier after synthesis, S est f is the amplitude of the initial transmission signal of the kth subcarrier, and S est Re is the kth subcarrier. This is the amplitude of the carrier retransmission signal.
  • the subcarrier index is a virtual frequency index after performing a demapping process for extracting only a frequency signal to which a desired signal is assigned from a frequency at which the signal is actually arranged. As described above, by combining and retransmitting / combining only the overlapped spectrum, efficient retransmission can be performed.
  • a simple addition may be used, a method of selecting a larger amplitude of the spectrum amplitude of each discrete frequency of the initial transmission signal and the retransmission signal, or a maximum ratio synthesis. Weighted synthesis may be performed.
  • information frequency index or the like
  • the partial spectrum may be retransmitted in a predetermined pattern. In this case, it is not necessary to notify in particular.
  • the first embodiment discloses a method of rearranging and transmitting only overlapping partial spectra at the time of retransmission
  • the frequency spectrum is cyclically shifted (modulo, remainder) on the frequency axis. Then, the overlapping partial spectrum is rearranged.
  • FIG. 5 is a diagram illustrating an example of a concept of a retransmission method according to the second embodiment of the present invention.
  • the frequency signal is cyclically shifted at the time of retransmission.
  • partial spectrums 4 arranged at overlapping frequencies are partially spectrumd 42 in retransmission signal 41 of first mobile station apparatus 101-1 and partially transmitted in retransmission signal 43 of second mobile station apparatus 101-2. It is assumed that a cyclic shift is performed so as to be arranged in the spectrum 44. Thereby, since the probability that the same partial spectrum as the initial transmission overlaps at the time of retransmission decreases, retransmission efficiency increases.
  • FIG. 6 is a block diagram showing an example of the configuration of the mobile station apparatus 101 according to the second embodiment of the present invention.
  • the partial spectrum extraction unit 13 of FIG. 2 is a modulo unit 51, which is a feature of the present embodiment.
  • the modulo unit 51 gives a cyclic shift to the same frequency signal as the cyclic transmission amount detected by the control signal detection unit 113 and the initial transmission signal output from the retransmission signal generation unit 12. . If the cyclic shift amount given to the u th mobile station apparatus 101 is K (u) and the original signal bandwidth of the u th mobile station apparatus 101 is N DFT (u), the cyclically shifted k th frequency.
  • the amplitude S cyc (u, k) represented by the complex number of the frequency signal at is expressed by Equation (2).
  • k is a natural number from 0 to N DFT (u) ⁇ 1
  • S (u, k) is represented by a complex number of frequency signals at the k-th frequency of the original frequency signal of the u-th mobile station apparatus 101. Amplitude.
  • K (u) is set for each mobile station apparatus 101 so that the processing of equation (2) can be performed.
  • K (u) is set for each mobile station apparatus 101 so that the processing of equation (2) can be performed.
  • the frequency of the overlapping spectrum may be based on a received signal-to-noise power ratio (SNR) of the received signal from the mobile station apparatus 101 in the base station apparatus 103.
  • SINR Signal-to-noise power ratio
  • SINR Signal to Interference plus Noise power Ratio
  • this embodiment is a cyclic shift, the frequency arrangement of the initial transmission signal may be reversed as in the case of mirroring.
  • FIG. 7 is a block diagram showing an example of the configuration of the base station apparatus 103 according to the second embodiment of the present invention.
  • cyclic shift calculation units 61-1 to 61-U for modulo are added, and this is the point of this embodiment.
  • the cyclic shift calculation units 61-1 to 61-U calculate the amount of cyclic shift from the overlapping frequency information detected by the overlapping frequency detection units 23-1 to 23-U.
  • the amount of cyclic shift may be set to the same amount for all mobile station apparatuses 101 at the same time, or may be determined for each mobile station apparatus 101.
  • an example of the setting method will be described.
  • the p-th to P-th frequency signals are set to be cyclically shifted by p so that there is a high possibility that the p-th to P-th frequency signals will not overlap in retransmission.
  • FIG. 8 is a conceptual diagram specifically showing the cyclic shift setting method according to the second embodiment of the present invention.
  • the present invention is based on the essence of retransmitting duplicated spectrums with high accuracy, and therefore a retransmission method that reduces the probability that duplicated spectra are duplicated again is included in the present invention.
  • the basic configuration of the data detecting / synthesizing unit 21 is the same as that shown in FIG. 4, but the synthesizing process is performed after returning the spectrum cyclically shifted by modulo to the original order.
  • this combining process is not specifically described, it is technical common sense to restore the spectrum and combine the initial transmission signal and the retransmission signal, and the essence of the present invention is the resending in the SORM.
  • control or the probability of overlapping is made low so that the overlapping spectrum does not overlap as much as possible at the time of retransmission.
  • the program that operates in the mobile station apparatus 101 and the base station apparatus 103 related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention.
  • Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary.
  • a recording medium for storing the program a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient.
  • the processing is performed in cooperation with the operating system or other application programs.
  • the functions of the invention may be realized.
  • the program when distributing to the market, can be stored and distributed on a portable recording medium, or transferred to a server computer connected via a network such as the Internet.
  • the storage device of the server computer is also included in the present invention.
  • LSI which is typically an integrated circuit.
  • Each functional block of the mobile station apparatus 101 and the base station apparatus 103 may be individually chipped, or a part or all of them may be integrated into a chip.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • an integrated circuit based on the technology can also be used.

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Abstract

In a case where communications are performed in such a manner that identical frequencies, which are at least some of a plurality of frequencies, are used, at the same time, to cause signals to overlap each other, retransmissions can be efficiently performed. A wireless communication system permits the coincidences of some or all of the frequencies that are used for a plurality of first communication apparatuses to transmit radio signals to a second communication apparatus. In the wireless communication system, when the first communication apparatuses perform the signal retransmissions to the second communication apparatus, only partial spectra (6, 8), which are respective parts of the initially-transmitted signals (1, 2), are transmitted to the second communication apparatus. The partial spectra (6, 8) correspond to a spectrum (4) located at the frequencies that were coincident with each other when the first communication apparatuses transmitted the initially-transmitted signals.

Description

無線通信システム、通信制御装置、通信端末装置および制御プログラムWireless communication system, communication control device, communication terminal device, and control program
 本発明は、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、重複を許容した信号の再送方法に関する。 The present invention relates to a signal retransmission method in which duplication is permitted when communication is performed by duplicating signals using at least some of the same frequencies at the same time.
 第3.9世代の携帯電話の無線通信システムであるLTE(Long Term Evolution)システムの標準化がほぼ完了し、最近ではLTEシステムをより発展させたLTE-A(LTE-Advanced)が、第4世代の無線通信システム(IMT-Aなどとも称する)の候補の一つとして標準化が行なわれている。一般的に、移動通信システムの上り回線(移動局から基地局への通信)では、移動局が送信局となるため、限られた送信電力で増幅器の電力利用効率を高く維持でき、ピーク電力の低いシングルキャリア方式(LTEではSC-FDMA(Single Carrier FrequencyDivision Multiple Access)方式が採用されている)が有効とされている。なお、SC-FDMAはDFT-S-OFDM(Discrete Fourier Transform Spread Orthogonal Frequency DivisionMultiplexing)やDFT-precoded OFDMなどとも呼ばれる。 Standardization of the LTE (Long Term Evolution) system, which is the wireless communication system for the 3.9th generation mobile phone, is almost completed. Recently, LTE-A (LTE-Advanced), which is a further development of the LTE system, is the fourth generation. Standardization is being carried out as one of the candidates for wireless communication systems (also referred to as IMT-A, etc.). Generally, in the uplink of a mobile communication system (communication from a mobile station to a base station), the mobile station becomes a transmitting station, so that the power utilization efficiency of the amplifier can be maintained high with limited transmission power, and the peak power A low single carrier system (LTE adopts SC-FDMA (Single Carrier Frequency Division Multiple Access) system) is effective. Note that SC-FDMA is also called DFT-S-OFDM (Discrete Fourier Transform Spread OrthogonalMultiFrequency DivisionMultiplexing) or DFT-precoded OFDM.
 LTE-Aでは、さらに周波数利用効率を改善させるために、送信電力に余裕のある端末については、SC-FDMAスペクトルを複数のサブキャリアから構成されるクラスタに分割し、各クラスタを周波数軸の任意の周波数に配置するClustered DFT-S-OFDM(ダイナミックスペクトル制御(DSC:Dynamic Spectrum Control)、SC-ASA(SingleCarrier Adaptive Spectrum Allocation)などとも称される)と呼ばれるアクセス方式を新たにサポートすることが決定されている。さらに、受信処理にターボ等化を前提に、各ユーザのスペクトル割当の際に周波数分割多重ではなく、伝搬路特性を優先して受信側で重複することを許容するスペクトル重複リソースマネジメント(SORM:Spectrum-Overlapped Resource Allocation、非特許文献1では、Spectrum-Overlapped ResourceManagementと書かれている)が提案されている(例えば、非特許文献1)。 In LTE-A, in order to further improve the frequency utilization efficiency, for terminals with sufficient transmission power, the SC-FDMA spectrum is divided into clusters composed of a plurality of subcarriers, and each cluster is arbitrarily assigned on the frequency axis. Decided to support a new access method called Clustered DFT-S-OFDM (also called Dynamic Spectrum Control (DSC), SC-ASA (SingleCarrier Adaptive Adaptive Spectrum Allocation)). Has been. Furthermore, on the premise of turbo equalization for reception processing, spectrum overlap resource management (SORM: Spectrum) that allows the receiver side to prioritize propagation path characteristics and not to perform frequency division multiplexing when assigning spectrum for each user. -Overlapped Resource Allocation, written as Spectrum-Overlapped ResourceManagement in Non-Patent Document 1) is proposed (for example, Non-Patent Document 1).
 図9は、SORMの一例を示す図である。一般的に、接続する全ユーザの信号を検出可能な上り回線に対してSORMを適用するものとする。同図では、基地局装置(受信装置、第2の通信装置)に同時に接続する移動局装置(送信装置、第1の通信装置)が2局である場合を例としている。なお、全ユーザの信号を検出可能である場合は上り回線としているが、他のユーザを検出することが許容される場合には下り回線にも勿論適用できる。図9において、第1の移動局装置101-1と、第2の移動局装置101-2(以下、第1の移動局装置101-1、第2の移動局装置101-2を合わせて、移動局装置101と表す)が、それぞれ周波数軸上に信号を送信信号102-1、送信信号102-2のように配置して送信するものとする。それぞれの信号を基地局装置103が受信する。このときの周波数軸上の受信信号104は、図9のようになるものとする。このとき、受信信号104に含まれる、受信信号104の部分スペクトル104-Aは移動局装置101-1、101-2の両方が信号を配置したため、重複されて受信される。SORMでは、このように重複された信号をターボ等化により分離することで、それぞれの移動局装置からの送信信号を分離できる。 FIG. 9 is a diagram illustrating an example of a SORM. In general, it is assumed that SORM is applied to an uplink that can detect signals of all connected users. In the figure, an example is shown in which there are two mobile station devices (transmitting device, first communication device) that are simultaneously connected to a base station device (receiving device, second communication device). In addition, although it is set as the uplink when the signals of all users can be detected, it is of course applicable to the downlink when it is allowed to detect other users. In FIG. 9, the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 (hereinafter, the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 are combined, It is assumed that the mobile station device 101) transmits signals arranged on the frequency axis as transmission signal 102-1 and transmission signal 102-2, respectively. The base station apparatus 103 receives each signal. The received signal 104 on the frequency axis at this time is as shown in FIG. At this time, the partial spectrum 104-A of the received signal 104 included in the received signal 104 is received in an overlapping manner because both mobile station apparatuses 101-1 and 101-2 have arranged the signal. In SORM, the transmission signals from the respective mobile station apparatuses can be separated by separating the overlapped signals by turbo equalization.
 SORMでは、ターボ等化技術により、部分スペクトルが重複したとしても各移動局装置101からの信号を分離することができる。そのため、重複してもよいということを考慮すれば伝搬路特性を優先して各移動局装置101に信号を伝送する周波数を割り当てることができるようになり、伝送特性を高めることができる。 In SORM, signals from each mobile station apparatus 101 can be separated by turbo equalization technology even if partial spectra overlap. For this reason, in consideration of the fact that they may overlap, it is possible to assign a frequency for transmitting a signal to each mobile station apparatus 101 with priority on the propagation path characteristics, thereby improving the transmission characteristics.
 しかしながら、SORMはターボ等化が正しく収束しない、即ち、ターボ等化の1回目の処理でシンボル間干渉(ISI:Inter-SymbolInterference)やユーザ間干渉(IUI:Inter-User Interference)を抑圧できない場合には、そこからの改善が見られなくなるため、何回繰り返しても信号を分離することができず、検出誤りとなる。このような検出誤りが発生した場合に、同一データや前の伝送機会で送信したパケットや同一のパケットの冗長ビットを送信することで受信品質を高める、あるいは誤り訂正能力を高めるハイブリッド自動再送制御(HARQ:Hybrid Automatic Repeat-reQuest)が存在するが、ターボ等化が正しく収束しない理由が重複した部分スペクトルであることを考慮すると、効率的な再送方法とはいえない。 However, SORM does not converge correctly for turbo equalization, that is, when inter-symbol interference (ISI: Inter-User Interference) or inter-user interference (IUI) cannot be suppressed in the first turbo equalization process. Since no improvement is seen from there, the signal cannot be separated no matter how many times it is repeated, resulting in a detection error. When such a detection error occurs, a hybrid automatic retransmission control that improves the reception quality by transmitting the same data, the packet transmitted at the previous transmission opportunity or the redundant bit of the same packet, or the error correction capability ( HARQ: Hybrid (Automatic Repeat-reQuest) exists, but considering that the reason why turbo equalization does not converge correctly is an overlapping partial spectrum, it is not an efficient retransmission method.
 一方、シングルキャリアの再送方法として、部分スペクトル再送制御(非特許文献2)が提案されている。上記文献には、初送において伝搬路特性の著しく劣化した周波数の信号スペクトルのみを再送するということが記載されているが、SORMに関して記載されておらず、SORMの特性劣化の原因が重複によるものであることを考慮すると、この文献の方法を利用しても効率的な再送ができないという問題があった。 Meanwhile, partial spectrum retransmission control (Non-Patent Document 2) has been proposed as a single carrier retransmission method. In the above document, it is described that only the signal spectrum of the frequency whose propagation path characteristics are significantly deteriorated in the initial transmission is described, but there is no description regarding the SORM, and the cause of the deterioration in the characteristics of the SORM is due to duplication. Considering this, there is a problem that efficient retransmission cannot be performed even if the method of this document is used.
 本発明は、このような事情に鑑みてなされたものであり、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を可能とする無線通信システム、通信制御装置、通信端末装置および制御プログラムを提供することを目的とする。 The present invention has been made in view of such circumstances, and wireless communication that enables efficient retransmission in the case of performing communication by overlapping signals using at least some of the same frequencies at the same time. An object is to provide a system, a communication control device, a communication terminal device, and a control program.
 (1)上記の目的を達成するために、本発明は、以下のような手段を講じた。すなわち、本発明の無線通信システムは、複数の第1の通信装置が第2の通信装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムであって、前記各第1の通信装置が前記第2の通信装置に対して再送信号を送信する場合は、初送信号の一部である部分スペクトルのみを前記第2の通信装置に対して送信することを特徴としている。 (1) In order to achieve the above object, the present invention has taken the following measures. In other words, the wireless communication system of the present invention allows wireless communication that allows some or all of the frequencies used when a plurality of first communication devices transmit wireless signals to the second communication device overlap. In the system, when each of the first communication devices transmits a retransmission signal to the second communication device, only a partial spectrum that is a part of an initial transmission signal is transmitted to the second communication device. It is characterized by transmitting.
 このように、各第1の通信装置が第2の通信装置に対して再送信号を送信する場合は、初送信号の一部である部分スペクトルのみを第2の通信装置に対して送信するので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 Thus, when each first communication device transmits a retransmission signal to the second communication device, only the partial spectrum that is a part of the initial transmission signal is transmitted to the second communication device. When the first communication apparatus performs communication by overlapping signals using at least some of the same frequencies at the same time, efficient retransmission can be performed.
 (2)また、本発明の無線通信システムにおいて、前記部分スペクトルは、前記各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルであることを特徴としている。 (2) Further, in the wireless communication system of the present invention, the partial spectrum is a spectrum arranged at an overlapping frequency when each first communication device transmits an initial transmission signal.
 このように、部分スペクトルは、各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルであるので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 Thus, since the partial spectrum is a spectrum that is arranged at an overlapping frequency when each first communication device transmits the initial transmission signal, the first communication device has at least a part of the same frequency at the same time. In the case where communication is performed by duplicating signals using, efficient retransmission can be performed.
 (3)また、本発明の無線通信システムにおいて、前記部分スペクトルは、前記第2の通信装置において、前記各第1の通信装置から受信した無線信号の受信SNR(Signal to Noise power Ratio)または受信SINR(Signalto Interference plus Noise power Ratio)に基づいて設定されることを特徴としている。 (3) Further, in the wireless communication system of the present invention, the partial spectrum is received in the second communication device by a reception SNR (Signal to Noise power Ratio) or reception of a radio signal received from each of the first communication devices. It is set based on SINR (Signalto | Interference | plus | Noise | power * Ratio).
 このように、部分スペクトルは、第2の通信装置において、各第1の通信装置から受信した無線信号の受信SNR(Signalto Noise power Ratio)または受信SINR(Signal to Interferenceplus Noise power Ratio)に基づいて設定されるので、第2の通信装置は、制御信号に含まれる初送時の信号から、重複した部分スペクトルを検出することができる。 Thus, the partial spectrum is set in the second communication device based on the reception SNR (SignaltoalNoise power Ratio) or the reception SINR (Signal toInterferenceplus Noise power Ratio) of the radio signal received from each first communication device. Therefore, the second communication device can detect the overlapped partial spectrum from the initial transmission signal included in the control signal.
 (4)また、本発明の無線通信システムにおいて、いずれかの前記第1の通信装置は、いずれか他の前記第1の通信装置が使用する周波数とは重複しない周波数に配置された部分スペクトルを前記第2の通信装置に対して送信することを特徴としている。 (4) Further, in the wireless communication system of the present invention, any one of the first communication devices has a partial spectrum arranged at a frequency that does not overlap with a frequency used by any other first communication device. It transmits to said 2nd communication apparatus, It is characterized by the above-mentioned.
 このように、第1の通信装置は、いずれか他の第1の通信装置が使用する周波数とは重複しない周波数に配置された部分スペクトルを第2の通信装置に対して送信するので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 In this way, the first communication device transmits the partial spectrum arranged at a frequency that does not overlap with the frequency used by any other first communication device to the second communication device. When the communication devices perform communication by overlapping signals using at least some of the same frequencies at the same time, efficient retransmission can be performed.
 (5)また、本発明の無線通信システムにおいて、複数の第1の通信装置が第2の通信装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムであって、前記各第1の通信装置が前記第2の通信装置に対して再送信号を送信する場合は、再送信号を周波数軸上でサイクリックシフトして前記第2の通信装置に対して送信することを特徴としている。 (5) Further, in the wireless communication system of the present invention, a part or all of the frequencies used when a plurality of first communication devices transmit wireless signals to the second communication device are allowed to overlap. When each of the first communication devices transmits a retransmission signal to the second communication device, the second communication is performed by cyclically shifting the retransmission signal on the frequency axis. It transmits to the apparatus.
 このように、各第1の通信装置が第2の通信装置に対して再送信号を送信する場合は、再送信号を周波数軸上でサイクリックシフトして第2の通信装置に対して送信するので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 Thus, when each first communication device transmits a retransmission signal to the second communication device, the retransmission signal is cyclically shifted on the frequency axis and transmitted to the second communication device. In the case where the first communication apparatus performs communication by overlapping signals using at least some of the same frequencies at the same time, the probability that the same partial spectrum as that of the initial transmission will overlap at the time of retransmission is reduced, so that the retransmission efficiency is improved. Rise.
 (6)また、本発明の無線通信システムにおいて、前記再送信号を周波数軸上でサイクリックシフトする量は、前記第2の通信装置において、前記各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルに基づいて決定されることを特徴としている。 (6) In the wireless communication system of the present invention, the amount by which the retransmission signal is cyclically shifted on the frequency axis is determined by the first communication device transmitting the initial transmission signal in the second communication device. It is characterized in that it is determined on the basis of spectra arranged at overlapping frequencies.
 このように、再送信号を周波数軸上でサイクリックシフトする量は、第2の通信装置において、各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルに基づいて決定されるので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 As described above, the amount of cyclic shift of the retransmitted signal on the frequency axis is based on the spectrum arranged in the overlapping frequency when each first communication device transmits the initial transmission signal in the second communication device. Therefore, when the first communication apparatus performs communication by overlapping signals using at least a part of the same frequency at the same time, the probability that the same partial spectrum as that of the initial transmission is overlapped at the time of retransmission is low. Therefore, retransmission efficiency is increased.
 (7)また、本発明の無線通信システムにおいて、前記再送信号を周波数軸上でサイクリックシフトする量は、前記第2の通信装置において、前記各第1の通信装置から受信した無線信号の受信SNR(Signal to Noise power Ratio)または受信SINR(Signalto Interference plus Noise power Ratio)に基づいて設定されることを特徴としている。 (7) Further, in the wireless communication system of the present invention, the amount of cyclic shift of the retransmission signal on the frequency axis is the reception of the wireless signal received from each first communication device in the second communication device. It is characterized in that it is set based on SNR (Signal to Noise power Ratio) or received SINR (Signalto Interference plus Noise power Ratio).
 このように、再送信号を周波数軸上でサイクリックシフトする量は、第2の通信装置において、各第1の通信装置から受信した無線信号の受信SNR(Signal to Noise power Ratio)または受信SINR(Signalto Interference plus Noise power Ratio)に基づいて設定されるので、第2の通信装置は、制御信号に含まれる初送時の信号から、重複した部分スペクトルを検出することができる。 As described above, the amount of cyclic shift of the retransmitted signal on the frequency axis is determined by the reception SNR (Signal to Noise power Ratio) or the reception SINR of the radio signal received from each first communication device in the second communication device. Since it is set based on (Signalto | Interference | plus | Noise | power | Ratio), the 2nd communication apparatus can detect the overlapping partial spectrum from the signal at the time of the initial transmission contained in a control signal.
 (8)また、本発明の無線通信システムにおいて、いずれかの前記第1の通信装置は、いずれか他の前記第1の通信装置が使用する周波数とは重複しないように、再送信号を周波数軸上でサイクリックシフトして前記第2の通信装置に対して送信することを特徴としている。 (8) Further, in the wireless communication system of the present invention, any one of the first communication devices uses a retransmission signal on a frequency axis so as not to overlap with a frequency used by any other first communication device. A cyclic shift is performed above, and transmission is performed to the second communication device.
 このように、いずれかの第1の通信装置は、いずれか他の第1の通信装置が使用する周波数とは重複しないように、再送信号を周波数軸上でサイクリックシフトして前記第2の通信装置に対して送信するので、第1の通信装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 In this way, any of the first communication devices cyclically shifts the retransmission signal on the frequency axis so as not to overlap with the frequency used by any other first communication device. Probability of overlapping the same partial spectrum as the initial transmission at the time of retransmission when the first communication device performs communication by overlapping signals using at least a part of the same frequency at the same time because it is transmitted to the communication device Thus reducing the efficiency of retransmission.
 (9)また、本発明の通信制御装置は、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置であって、前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する判定部(データ検出・合成部、誤り検出部に該当)と、前記判定の結果、誤りがあった場合は、前記各通信端末装置が初送信号を送信した際に重複した周波数を検出する重複周波数検出部と、を備え、前記検出した周波数を示す情報を、前記各通信端末装置に送信することを特徴としている。 (9) Moreover, the communication control apparatus of this invention is a radio | wireless communications system which accept | permits the one part or all part of the frequency used when a some communication terminal device transmits a radio signal with respect to a communication control apparatus overlapping. And a determination unit (corresponding to a data detection / combination unit and an error detection unit) that determines whether or not there is an error in the decoding result of the radio signal received from each communication terminal device. If there is an error as a result of the determination, the communication terminal device includes an overlapping frequency detection unit that detects an overlapping frequency when transmitting an initial transmission signal, and indicates information indicating the detected frequency. And transmitting to each of the communication terminal devices.
 このように、通信制御装置が、判定の結果、誤りがあった場合は、前記各通信端末装置が初送信号を送信した際に重複した周波数を検出するので、通信端末装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 As described above, when there is an error as a result of the determination, the communication terminal device detects the overlapping frequency when each communication terminal device transmits the initial transmission signal, so that the communication terminal device at least at the same time. When performing communication by overlapping signals using some of the same frequency, efficient retransmission can be performed.
 (10)また、本発明の通信端末装置は、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置であって、前記通信制御装置から受信した応答信号を検出する応答信号検出部と、前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出する部分スペクトル抽出部と、を備え、前記抽出した部分スペクトルのみを再送信号として前記通信制御装置に対して送信することを特徴としている。 (10) Further, the communication terminal device of the present invention is a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal devices transmit radio signals to the communication control device. And a response signal detection unit that detects a response signal received from the communication control device, and the communication control device when the detected response signal is NACK (Negative Acknowledge) A partial spectrum extraction unit that extracts a partial spectrum that is a part of the initial transmission signal based on the information indicating the overlapped frequency received from the mobile station, and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control device. It is characterized by transmitting to.
 このように、通信端末装置は、検出した応答信号が、NACK(Negative Acknowledge)である場合は、通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出し、抽出した部分スペクトルのみを再送信号として通信制御装置に対して送信するので、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 In this way, when the detected response signal is NACK (Negative Acknowledge), the communication terminal apparatus is a part of the initial transmission signal based on the information indicating the overlapping frequency received from the communication control apparatus. Since the spectrum is extracted and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control apparatus, it is efficient when communication is performed by overlapping signals using at least some of the same frequencies at the same time. Retransmission can be performed.
 (11)また、本発明の通信制御装置は、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置であって、前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する判定部と、前記判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出するサイクリックシフト算出部と、を備え、前記算出したサイクリックシフト量を示す情報を、前記各通信端末装置に送信することを特徴としている。 (11) Further, the communication control apparatus of the present invention is a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus. And a determination unit that determines whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices, and if the result of the determination is an error, A cyclic shift calculation unit that calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each of the communication terminal devices.
 このように、通信制御装置が、判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出し、算出したサイクリックシフト量を示す情報を、各通信端末装置に送信するので、通信端末装置が、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 As described above, when there is an error as a result of the determination, the communication control device calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each communication terminal device. Therefore, in the case where the communication terminal apparatus performs communication by duplicating signals using at least some of the same frequencies at the same time, the probability that the same partial spectrum as that of the initial transmission is duplicated at the time of retransmission is reduced, so that the retransmission efficiency is improved. Rise.
 (12)また、本発明の通信端末装置は、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置であって、前記通信制御装置から受信した応答信号を検出する応答信号検出部と、前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行なうモジュロ部と、を備え、前記サイクリックシフトした再送信号を前記通信制御装置に対して送信することを特徴としている。 (12) Further, the communication terminal device of the present invention is a wireless communication system that allows some or all of the frequencies used when a plurality of communication terminal devices transmit a radio signal to the communication control device. And a response signal detection unit that detects a response signal received from the communication control device, and the communication control device when the detected response signal is NACK (Negative Acknowledge) A modulo unit that cyclically shifts the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the transmitter, and transmits the cyclically shifted retransmission signal to the communication control device It is characterized by that.
 このように、通信端末装置は、検出した応答信号が、NACK(Negative Acknowledge)である場合は、通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行ない、サイクリックシフトした再送信号を通信制御装置に対して送信するので、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 As described above, when the detected response signal is NACK (Negative Acknowledge), the communication terminal apparatus cyclically transmits the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the communication control apparatus. Since the click-shift is performed and the cyclic-shifted retransmission signal is transmitted to the communication control device, in the case of performing communication by overlapping signals using at least a part of the same frequency at the same time, Since the probability that the same partial spectrum overlaps decreases, retransmission efficiency increases.
 (13)また、本発明の制御プログラムは、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置の制御プログラムであって、前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する処理と、前記判定の結果、誤りがあった場合は、前記各通信端末装置が初送信号を送信した際に重複した周波数を検出する処理と、前記検出した周波数を示す情報を、前記各通信端末装置に送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴としている。 (13) Further, the control program of the present invention is a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit wireless signals to the communication control apparatus. A control program for the communication control apparatus to be applied, a process for determining whether or not there is an error in the decoding result of the radio signal received from each communication terminal apparatus; A series of processes including a process of detecting a duplicate frequency when each communication terminal apparatus transmits an initial transmission signal, and a process of transmitting information indicating the detected frequency to each communication terminal apparatus, It is characterized by being commanded to be readable and executable on a computer.
 このように、通信制御装置が、判定の結果、誤りがあった場合は、各通信端末装置が初送信号を送信した際に重複した周波数を検出し、検出した周波数を示す情報を、各通信端末装置に送信するので、通信端末装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 As described above, when there is an error as a result of the determination, the communication control device detects an overlapped frequency when each communication terminal device transmits the initial transmission signal, and information indicating the detected frequency is set for each communication. Since transmission is performed to the terminal device, efficient retransmission can be performed when the communication terminal device performs communication by overlapping signals using at least some of the same frequencies at the same time.
 (14)また、本発明の制御プログラムは、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置の制御プログラムであって、前記通信制御装置から受信した応答信号を検出する処理と、前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出する処理と、前記抽出した部分スペクトルのみを再送信号として前記通信制御装置に対して送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴としている。 (14) Further, the control program of the present invention is a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit wireless signals to the communication control apparatus. A control program for a communication terminal device to be applied, in which processing for detecting a response signal received from the communication control device, and when the detected response signal is NACK (Negative Acknowledge), from the communication control device Based on the received information indicating the overlapping frequency, a process of extracting a partial spectrum that is a part of the initial transmission signal, a process of transmitting only the extracted partial spectrum as a retransmission signal to the communication control device, A series of processes is commanded to be readable and executable by a computer.
 このように、通信端末装置は、検出した応答信号が、NACK(Negative Acknowledge)である場合は、通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出し、抽出した部分スペクトルのみを再送信号として通信制御装置に対して送信するので、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 In this way, when the detected response signal is NACK (Negative Acknowledge), the communication terminal apparatus is a part of the initial transmission signal based on the information indicating the overlapping frequency received from the communication control apparatus. Since the spectrum is extracted and only the extracted partial spectrum is transmitted as a retransmission signal to the communication control apparatus, it is efficient when communication is performed by overlapping signals using at least some of the same frequencies at the same time. Retransmission can be performed.
 (15)本発明の制御プログラムは、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置の制御プログラムであって、前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する処理と、前記判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出する処理と、前記算出したサイクリックシフト量を示す情報を、前記各通信端末装置に送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴としている。 (15) The control program of the present invention is applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus. A process for determining whether or not there is an error in the decoding result of the radio signal received from each communication terminal apparatus, and if there is an error as a result of the determination, A series of processes of calculating a cyclic shift amount on the axis and transmitting information indicating the calculated cyclic shift amount to each of the communication terminal devices can be read and executed by a computer. It is characterized by being commanded.
 このように、通信制御装置が、判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出し、算出したサイクリックシフト量を示す情報を、各通信端末装置に送信するので、通信端末装置が同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 As described above, when there is an error as a result of the determination, the communication control device calculates a cyclic shift amount on the frequency axis, and transmits information indicating the calculated cyclic shift amount to each communication terminal device. Therefore, when the communication terminal apparatus performs communication by overlapping signals using at least a part of the same frequency at the same time, the probability that the same partial spectrum as that of the initial transmission is overlapped at the time of retransmission is reduced, so that retransmission efficiency is increased. .
 (16)本発明の制御プログラムは、複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置の制御プログラムであって、前記通信制御装置から受信した応答信号を検出する処理と、前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行なう処理と、前記サイクリックシフトした再送信号を前記通信制御装置に対して送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴としている。 (16) The control program of the present invention is applied to a radio communication system that allows a part or all of the frequencies used when a plurality of communication terminal apparatuses transmit radio signals to the communication control apparatus. A communication terminal device control program for detecting a response signal received from the communication control device, and if the detected response signal is NACK (Negative Acknowledge), received from the communication control device A series of processes including a process of cyclically shifting a retransmission signal on the frequency axis based on information indicating a cyclic shift amount, and a process of transmitting the cyclically shifted retransmission signal to the communication control device Is characterized by being commanded to be readable and executable by a computer.
 このように、通信端末装置は、検出した応答信号が、NACK(Negative Acknowledge)である場合は、通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行ない、サイクリックシフトした再送信号を通信制御装置に対して送信するので、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 As described above, when the detected response signal is NACK (Negative Acknowledge), the communication terminal apparatus cyclically transmits the retransmission signal on the frequency axis based on the information indicating the cyclic shift amount received from the communication control apparatus. Since the click-shift is performed and the cyclic-shifted retransmission signal is transmitted to the communication control device, in the case of performing communication by overlapping signals using at least a part of the same frequency at the same time, Since the probability that the same partial spectrum overlaps decreases, retransmission efficiency increases.
 本発明により、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう場合において、効率的な再送を行なうことができる。 According to the present invention, efficient retransmission can be performed in the case where communication is performed by overlapping signals using at least some of the same frequencies at the same time.
本発明の第1の実施形態に係る再送方法の概念の一例を示す図である。It is a figure which shows an example of the concept of the retransmission method which concerns on the 1st Embodiment of this invention. 本発明の第1の実施形態に係る移動局装置101の構成の一例を示すブロック図である。It is a block diagram which shows an example of a structure of the mobile station apparatus 101 which concerns on the 1st Embodiment of this invention. 本発明の第1の実施形態に係る基地局装置103の構成の一例を示すブロック図である。It is a block diagram which shows an example of a structure of the base station apparatus 103 which concerns on the 1st Embodiment of this invention. 本発明の第1の実施形態に係るデータ検出・合成部21-1~21-Uの構成の一例を示すブロック図である。FIG. 3 is a block diagram showing an example of the configuration of data detection / synthesis units 21-1 to 21-U according to the first embodiment of the present invention. 本発明の第2の実施形態に係る再送方法の概念の一例を示す図である。It is a figure which shows an example of the concept of the retransmission method which concerns on the 2nd Embodiment of this invention. 本発明の第2の実施形態に係る移動局装置101の構成の一例を示すブロック図である。It is a block diagram which shows an example of a structure of the mobile station apparatus 101 which concerns on the 2nd Embodiment of this invention. 本発明の第2の実施形態に係る基地局装置103の構成の一例を示すブロック図である。It is a block diagram which shows an example of a structure of the base station apparatus 103 which concerns on the 2nd Embodiment of this invention. 本発明の第2の実施形態に係るサイクリックシフト設定方法を具体的に示す概念図である。It is a conceptual diagram which shows concretely the cyclic shift setting method which concerns on the 2nd Embodiment of this invention. SORMの一例を示す図である。It is a figure which shows an example of SORM. 移動局装置101の基本構成の一例を示すブロック図である。2 is a block diagram illustrating an example of a basic configuration of a mobile station apparatus 101. FIG. 基地局装置103の構成を示すブロック図である。3 is a block diagram showing a configuration of a base station apparatus 103. FIG.
 以下、本発明の実施形態について図面を参照して説明する。なお、以下の実施形態では、SORMを前提として説明をするが、例えば、MIMO(Multiple Input Multiple Output)など、同一時刻に少なくとも一部の同一周波数を用いて信号を重複させて通信を行なう方法であれば本発明を適用できる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, description will be made on the assumption that SORM is used. However, for example, MIMO (Multiple Input Multiple Output) is used to perform communication by overlapping signals using at least some of the same frequencies at the same time. The present invention can be applied if it exists.
 図10は、移動局装置101の基本構成の一例を示すブロック図である。まず、移動局装置101は基地局装置103から下り回線で通知された制御信号をアンテナ111で受信し、無線受信部112により、ベースバンド信号にダウンコンバートし、A/D変換する。得られたベースバンド信号から、制御信号検出部113により、データ信号を生成するために必要な変調方式や符号化率に関する情報(MCS)や、参照信号の系列に関する情報、周波数割当情報などを検出する。 FIG. 10 is a block diagram illustrating an example of a basic configuration of the mobile station apparatus 101. First, the mobile station apparatus 101 receives the control signal notified from the base station apparatus 103 on the downlink by the antenna 111, and the radio reception unit 112 down-converts it to a baseband signal and performs A / D conversion. From the obtained baseband signal, the control signal detection unit 113 detects information (MCS) on the modulation scheme and coding rate necessary for generating the data signal, information on the reference signal sequence, frequency allocation information, etc. To do.
 これら得られた制御情報に基づき、まずデータ信号生成部114により、送信するデータの周波数信号を生成する。データ信号生成部114では、MCSに関する情報に基づいて情報ビット列が誤り訂正符号化され、QPSKや16QAMなどの変調シンボルが生成され、DFTにより周波数信号に変換される。次に、参照信号の系列に関する情報に基づいて参照信号生成部115により伝搬路推定用の参照信号(RS)が生成され、参照信号多重部116においてデータ信号と多重される。次に、周波数割当部117により通知された周波数割当情報に基づいて周波数に配置され、IFFT部118により時間信号に変換される。その後、CP挿入部119により、時間信号の後方の一部を前方にコピーする。その後、無線送信部120において、D/A変換し、無線周波数にアップコンバートした後、アンテナ111から送信する。 Based on the obtained control information, the data signal generation unit 114 first generates a frequency signal of data to be transmitted. In the data signal generation unit 114, the information bit string is subjected to error correction coding based on the information on the MCS, modulation symbols such as QPSK and 16QAM are generated, and converted into frequency signals by DFT. Next, a reference signal (RS) for propagation path estimation is generated by reference signal generation section 115 based on information relating to the series of reference signals, and multiplexed with a data signal in reference signal multiplexing section 116. Next, the frequency allocation unit 117 arranges the frequency based on the frequency allocation information notified by the frequency allocation unit 117, and converts it into a time signal by the IFFT unit 118. Thereafter, the CP insertion unit 119 copies a part of the rear of the time signal forward. Thereafter, the radio transmission unit 120 performs D / A conversion, up-converts the radio frequency, and then transmits from the antenna 111.
 図11は、基地局装置103の構成を示すブロック図である。ここでは、U局の移動局装置101が基地局装置103と接続しているものとする。アンテナ201で受信した受信信号は、無線受信部202により、ベースバンド信号に変換された後、ディジタル信号に変換される。その後、CP除去部203によりCPを除去し、FFT部204により周波数信号に変換される。次に、多重されている各移動局装置101の参照信号を参照信号分離部205により分離し、伝搬路特性・雑音電力推定部206-1~206-Uにより伝搬路特性と、雑音電力を推定する。ここで、移動局装置101毎に処理が必要なユニットについては、*-1~*-Uのように標記している。また、雑音には、回路内で生じる熱雑音や他の移動局装置101の通信による干渉も含む。 FIG. 11 is a block diagram showing the configuration of the base station apparatus 103. Here, it is assumed that mobile station apparatus 101 of U station is connected to base station apparatus 103. A reception signal received by the antenna 201 is converted into a baseband signal by the wireless reception unit 202 and then converted into a digital signal. Thereafter, CP is removed by CP removing section 203 and converted into a frequency signal by FFT section 204. Next, the multiplexed reference signal of each mobile station apparatus 101 is separated by reference signal separation section 205, and propagation path characteristics and noise power estimation sections 206-1 to 206-U estimate propagation path characteristics and noise power. To do. Here, units that need to be processed for each mobile station apparatus 101 are marked as * -1 to * -U. Further, the noise includes thermal noise generated in the circuit and interference due to communication of other mobile station apparatuses 101.
 参照信号を分離された受信信号は、信号キャンセル部207により、無線伝搬路の遅延波に起因して生じるシンボル間干渉(ISI)、および異なる移動局装置101の信号に起因した干渉であるユーザ間干渉(IUI)を除去する。ただし、1回目の処理では、ISIやIUIに関する情報が未知であることから何もキャンセルされない。その後、周波数デマッピング部208により各移動局装置101の信号を分離する。その後、データ検出部209-1~209-Uにより送信データを検出する。データ検出部209-1~209-Uでは、ISIおよびIUIに関する残留干渉成分の抑圧と、希望信号の合成を行なう等化処理の後、IDFTにより時間領域に変換し、符号ビットの受信信号(LLR)に分解され、誤り訂正復号が行なわれる。即ち、データ検出部209-1~209-Uから情報ビットおよび符号ビットのLLRが出力される。 The received signal from which the reference signal is separated is inter-symbol interference (ISI) caused by the delayed wave of the radio propagation path by the signal canceling unit 207, and interference between users that is caused by different mobile station apparatus 101 signals. Remove interference (IUI). However, in the first process, nothing is canceled because the information about the ISI and IUI is unknown. Thereafter, the frequency demapping unit 208 separates the signals of each mobile station apparatus 101. Thereafter, the transmission data is detected by the data detection units 209-1 to 209-U. The data detection units 209-1 to 209-U perform equalization processing for suppressing the residual interference components related to ISI and IUI and synthesizing desired signals, and then converting them into the time domain by IDFT, and receiving the received signals of code bits (LLR And error correction decoding is performed. That is, LLRs of information bits and code bits are output from the data detection units 209-1 to 209-U.
 まず、得られた符号ビットのLLRは、軟推定生成部210-1~210-Uにおいて、各移動局装置101からの受信信号の振幅の期待値(以後、軟推定と称する)が出力され、再び信号キャンセル部207に入力される。軟推定生成部210-1~210-Uでは、符号ビットのLLRから、ソフトレプリカと呼ばれる各変調シンボルの振幅の期待値を算出し、DFTにより周波数信号に変換し、各移動局装置101が送信する際に割り当てた周波数と同一の周波数に信号をマッピングする。その後、伝搬路特性・雑音電力推定部206-1~206-Uにより推定された伝搬路特性を乗算することで軟推定を算出している。この信号キャンセル部207、周波数デマッピング部208、データ検出部209-1~209-U、軟推定生成部210-1~210-Uの一連の処理の繰り返しがターボ等化技術と一般的に称され、これを任意の回数、所望の回数、或いは検出誤りがなくなるまで繰り返し、データ検出部209-1~209-Uから出力された情報ビットのLLRを硬判定することで、復号ビットを得る。 First, the LLRs of the obtained code bits are output as expected values (hereinafter referred to as soft estimation) of amplitudes of received signals from the mobile station apparatuses 101 in the soft estimation generation units 210-1 to 210-U. The signal is input again to the signal cancel unit 207. Soft estimation generation sections 210-1 to 210-U calculate the expected value of the amplitude of each modulation symbol called a soft replica from the LLR of the code bit, convert it to a frequency signal by DFT, and each mobile station apparatus 101 transmits The signal is mapped to the same frequency as the frequency assigned at the time. Thereafter, the soft estimation is calculated by multiplying the propagation path characteristics estimated by the propagation path characteristics / noise power estimation units 206-1 to 206-U. The repetition of a series of processes of the signal cancellation unit 207, frequency demapping unit 208, data detection units 209-1 to 209-U, and soft estimation generation units 210-1 to 210-U is generally referred to as a turbo equalization technique. This is repeated an arbitrary number of times, a desired number of times, or until there is no detection error, and the decoded bits are obtained by making a hard decision on the LLR of the information bits output from the data detection units 209-1 to 209-U.
 一方で、伝搬路特性・雑音電力推定部206-1~206-Uで推定された各移動局装置101の伝搬路特性から算出されるMCSや周波数割当、その他の制御を目的とする参照信号系列を示す情報や応答信号などの制御情報を制御情報生成部211-1~211-Uにより生成し、無線送信部212においてD/A変換、無線周波数へのアップコンバートが行なわれた後、アンテナ201から各移動局装置101に送信される。 On the other hand, a reference signal sequence for MCS, frequency allocation, and other control purposes calculated from the propagation path characteristics of each mobile station apparatus 101 estimated by the propagation path characteristics / noise power estimation units 206-1 to 206-U Control information generators 211-1 to 211 -U generate control information such as information indicating response and response signals, and after D / A conversion and up-conversion to a radio frequency are performed in radio transmission unit 212, antenna 201 To each mobile station apparatus 101.
 このように、SORMでは、信号キャンセル部207から軟推定生成部210-1~210-Uまでで構成されるターボ等化技術により、部分スペクトルが重複したとしても各移動局装置101からの信号を分離することができる。そのため、重複してもよいということを考慮すれば伝搬路特性を優先して各移動局装置101に信号を伝送する周波数を割り当てることができるようになり、伝送特性を高めることができる。 As described above, in the SORM, signals from each mobile station apparatus 101 are obtained even if partial spectra overlap by a turbo equalization technique configured from the signal cancel unit 207 to the soft estimation generation units 210-1 to 210-U. Can be separated. For this reason, in consideration of the fact that they may overlap, it is possible to assign a frequency for transmitting a signal to each mobile station apparatus 101 with priority on the propagation path characteristics, thereby improving the transmission characteristics.
 [第1の実施形態]
 図1は、本発明の第1の実施形態に係る再送方法の概念の一例を示す図である。ここでは、周波数信号の様子を例とし、同時に基地局装置103と接続する移動局装置数を2とする。まず、第1の移動局装置101-1と第2の移動局装置101-2は、送信信号1および送信信号2のように信号を周波数軸上に配置し、送信する(これを初送と呼ぶ)。このときの受信信号3は、図1のように表され、部分スペクトル4は重複して受信されている。
[First Embodiment]
FIG. 1 is a diagram illustrating an example of a concept of a retransmission method according to the first embodiment of the present invention. Here, the state of the frequency signal is taken as an example, and the number of mobile station apparatuses connected to the base station apparatus 103 at the same time is two. First, first mobile station apparatus 101-1 and second mobile station apparatus 101-2 arrange and transmit signals on the frequency axis like transmission signal 1 and transmission signal 2 (this is the initial transmission and transmission). Call). The reception signal 3 at this time is expressed as shown in FIG. 1, and the partial spectrum 4 is received in an overlapping manner.
 ここで、第1の移動局装置101-1および第2の移動局装置101-2の復号ビットの誤り(信号検出誤り)があったものとする。このとき、第1の移動局装置101-1および第2の移動局装置101-2は再送処理を行なうことになるが、信号の検出誤りの原因が重複した部分スペクトル4であるため、重複していた部分スペクトル4のみを再送する。すなわち、初送時の部分スペクトル4の位置に配置されている部分スペクトルのみを配置したもの(再送信号5、7の部分スペクトル6、8)のみを再送する。さらにこのとき、他の移動局装置101と重複しないように部分スペクトルのみを配置して送信することも可能とする。これにより、再送の効率が高まる。 Here, it is assumed that there is a decoding bit error (signal detection error) of the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2. At this time, the first mobile station apparatus 101-1 and the second mobile station apparatus 101-2 perform retransmission processing. However, since the cause of the signal detection error is the overlapping partial spectrum 4, Only the partial spectrum 4 that has been transmitted is retransmitted. That is, only the partial spectrum arranged at the position of partial spectrum 4 at the time of initial transmission (partial spectrums 6 and 8 of retransmission signals 5 and 7) is retransmitted. Furthermore, at this time, it is also possible to arrange and transmit only a partial spectrum so as not to overlap with other mobile station apparatuses 101. This increases the efficiency of retransmission.
 図2は、本発明の第1の実施形態に係る移動局装置101の構成の一例を示すブロック図である。図2において、図10の構成に対して、再送処理を行なえるよう応答信号検出部11、再送信号生成部12、部分スペクトル抽出部13、初送/再送切替部14を追加しており、本実施形態の特徴は、部分スペクトル抽出部13である。なお、図10と同じ符号が付してあるユニットについては、図10で述べた機能と同一であるため、説明を省略する。ここでは、後述するが基地局装置103において制御情報に応答信号と重複したスペクトルの周波数に関する情報が多重されているものとしている。 FIG. 2 is a block diagram showing an example of the configuration of the mobile station apparatus 101 according to the first embodiment of the present invention. In FIG. 2, a response signal detection unit 11, a retransmission signal generation unit 12, a partial spectrum extraction unit 13, and an initial transmission / retransmission switching unit 14 are added to the configuration of FIG. A feature of the embodiment is a partial spectrum extraction unit 13. In addition, about the unit to which the same code | symbol as FIG. 10 is attached | subjected, since it is the same as the function described in FIG. 10, description is abbreviate | omitted. Here, as will be described later, in the base station apparatus 103, it is assumed that information on the spectrum frequency overlapping with the response signal is multiplexed on the control information.
 情報ビット列はデータ信号生成部114に入力されると同時に、再送信号生成部12に入力される。制御信号検出部113から検出された応答信号は、応答信号検出部11に入力され、ACKかNACKかを判断する。得られたACKおよびNACKの情報は再送信号生成部12および初送/再送切替部14に入力される。再送信号生成部12では、応答信号検出部11による応答信号がNACKであれば前の伝送機会で送信した情報ビット列から同一の周波数信号を生成し、部分スペクトル抽出部13に入力される。部分スペクトル抽出部13では、制御信号に含まれる初送時の信号で、重複したスペクトルの周波数に関する情報に基づいて重複した部分スペクトルを抽出する。なお、重複したスペクトルがどの周波数であるかは、基地局装置103における移動局装置101からの受信信号の受信信号対雑音電力比(SNR:Signal to Noise power Ratio)に基づいても良い。さらに、雑音に干渉を含んだSINR(Signal to Interference plus Noise power Ratio)に基づいても良い。 The information bit string is input to the data signal generation unit 114 and simultaneously to the retransmission signal generation unit 12. The response signal detected from the control signal detection unit 113 is input to the response signal detection unit 11 and determines whether it is ACK or NACK. The obtained ACK and NACK information is input to the retransmission signal generation unit 12 and the initial transmission / retransmission switching unit 14. In the retransmission signal generation unit 12, if the response signal from the response signal detection unit 11 is NACK, the same frequency signal is generated from the information bit string transmitted at the previous transmission opportunity and input to the partial spectrum extraction unit 13. The partial spectrum extraction unit 13 extracts the overlapping partial spectrum based on the information regarding the frequency of the overlapping spectrum with the initial transmission signal included in the control signal. Note that the frequency of the overlapping spectrum may be based on the received signal-to-noise power ratio (SNR) of the received signal from the mobile station apparatus 101 in the base station apparatus 103. Further, it may be based on SINR (Signal to Interference plus Noise power Ratio) including interference in noise.
 これを、初送/再送切替部14に入力し、初送/再送切替部14では応答信号がACKの場合ではデータ信号生成部114からの信号を参照信号多重部116に入力し、NACKの場合は、部分スペクトル抽出部13から出力された部分スペクトルの再送信号を参照信号多重部116に入力するよう切り替える。ここでは、情報ビット列から再送信号を再び生成するような構成を一例としているが、前の伝送機会で送信した送信データと同一の信号を生成するので、前の伝送機会における送信データをバッファしておく機能を有する機能ブロックを再送信号生成部12と置き換えてもよい。 This is input to the initial transmission / retransmission switching unit 14, and when the response signal is ACK, the initial transmission / retransmission switching unit 14 inputs a signal from the data signal generation unit 114 to the reference signal multiplexing unit 116, and in the case of NACK Switches to input the retransmission signal of the partial spectrum output from the partial spectrum extraction unit 13 to the reference signal multiplexing unit 116. In this example, the retransmission signal is generated again from the information bit string. However, since the same signal as the transmission data transmitted at the previous transmission opportunity is generated, the transmission data at the previous transmission opportunity is buffered. The functional block having the function to be stored may be replaced with the retransmission signal generation unit 12.
 図3は、本発明の第1の実施形態に係る基地局装置103の構成の一例を示すブロック図である。基本的には、図11と同じ構成だが、再送信号を合成する手段も含めて図11のデータ検出部209-1~209-Uをデータ検出・合成部21-1~21-U(以下、データ検出・合成部21-1~21-Uを合わせて、データ検出・合成部21と表す)に置き換えている。また、復号ビット列が正しいかを検出する誤り検出部22-1~22-U、重複したスペクトルの周波数に関する情報を検出する重複周波数検出部23-1~23-U、正しく復号できた場合にACKおよび復号結果に誤りがある場合にNACKとする応答信号生成部24-1~24-Uが図11と異なる点であり、本実施形態の特徴は重複周波数検出部23-1~23-Uである。 FIG. 3 is a block diagram showing an example of the configuration of the base station apparatus 103 according to the first embodiment of the present invention. Basically, the configuration is the same as that of FIG. 11, but the data detection units 209-1 to 209-U of FIG. The data detection / combination units 21-1 to 21-U are collectively replaced with the data detection / synthesis unit 21). Also, error detection units 22-1 to 22-U that detect whether the decoded bit string is correct, overlap frequency detection units 23-1 to 23-U that detect information on the frequency of the overlapping spectrum, and ACK when decoding is correctly performed The response signal generators 24-1 to 24-U that perform NACK when there is an error in the decoding result are different from those in FIG. 11, and the feature of the present embodiment is the overlap frequency detectors 23-1 to 23-U. is there.
 各移動局装置101からの受信信号は、データ検出・合成部21-1~21-Uにより初送であれば図11のデータ検出部209-1~209-Uと同じ処理を行ない、再送信号であれば、初送時の受信信号との合成を行なう。データ検出・合成部21-1~21-Uから出力された復号ビット列は誤り検出部22-1~22-Uにより復号結果が正しいか否かが判定され、その判定結果が重複周波数検出部23-1~23-Uおよび応答信号生成部24-1~24-Uに入力される。重複周波数検出部23-1~23-Uでは、誤りが検出された場合に、重複した部分スペクトルの周波数位置が出力され、応答信号生成部24-1~24-UではACKあるいはNACKが出力される。制御情報生成部211-1~211-Uにそれぞれ入力する。次に、データ検出・合成部21-1~21-Uについて説明する。 If the received signal from each mobile station apparatus 101 is initially transmitted by the data detection / combination units 21-1 to 21-U, the same processing as the data detection units 209-1 to 209-U in FIG. If so, it is combined with the received signal at the time of initial transmission. The decoded bit strings output from the data detection / combination units 21-1 to 21-U are determined by the error detection units 22-1 to 22-U to determine whether the decoding result is correct, and the determination result is the overlap frequency detection unit 23. -1 to 23-U and response signal generators 24-1 to 24-U. In the case where an error is detected, the overlapping frequency detectors 23-1 to 23-U output the frequency position of the overlapping partial spectrum, and the response signal generators 24-1 to 24-U output ACK or NACK. The The information is input to the control information generation units 211-1 to 211-U. Next, the data detection / synthesis units 21-1 to 21-U will be described.
 図4は、本発明の第1の実施形態に係るデータ検出・合成部21-1~21-Uの構成の一例を示すブロック図である。基本的に、どの移動局装置101のデータ検出・合成部21も同一であるため、ここではU番目の移動局装置101のデータ検出・合成部21-Uとして説明する。データ検出・合成部21-Uは、等化部31-U、初送信号保持部32-U、合成部33-U、切替部34-U、IDFT部35-U、復調部36-U、復号部37-Uから構成される。周波数デマッピング部208より入力された信号は、等化部31-Uにより、信号の等化が行なわれる。等化後の信号は、もし受信信号が初送信号であれば初送信号保持部32-Uにより復号ビットが正しく検出されるまで保持される。また、もし再送信号であれば、初送信号保持部32-Uにより保持されている初送時の送信信号を呼び出し、合成部33-Uにより信号を合成する。このとき、再送信号は少なくとも初送信号の周波数帯域幅以下の帯域幅の部分スペクトルであるため、周波数位置を合わせて合成する。 FIG. 4 is a block diagram showing an example of the configuration of the data detection / synthesis units 21-1 to 21-U according to the first embodiment of the present invention. Basically, since the data detection / combination unit 21 of any mobile station apparatus 101 is the same, the data detection / combination unit 21-U of the U-th mobile station apparatus 101 will be described here. The data detection / synthesis unit 21-U includes an equalization unit 31-U, an initial transmission signal holding unit 32-U, a synthesis unit 33-U, a switching unit 34-U, an IDFT unit 35-U, a demodulation unit 36-U, It comprises a decoding unit 37-U. The signal input from the frequency demapping unit 208 is equalized by the equalization unit 31-U. If the received signal is the initial transmission signal, the equalized signal is held until the decoded bit is correctly detected by the initial transmission signal holding unit 32-U. If it is a retransmission signal, the transmission signal at the time of initial transmission held by the initial transmission signal holding unit 32-U is called, and the signal is synthesized by the synthesis unit 33-U. At this time, since the retransmitted signal is a partial spectrum having a bandwidth that is at least equal to the frequency bandwidth of the initial transmission signal, the retransmitted signal is synthesized by combining the frequency positions.
 次に、部分スペクトルの合成法について述べる。初送におけるサブキャリア数をNDFT、再送に使用した部分スペクトルを、初送信号のmからM番目の部分スペクトルとする。このとき、等化後の信号を単純に加算する場合、合成された周波数信号は、次式で表される。 Next, a method for synthesizing a partial spectrum will be described. Let N DFT be the number of subcarriers in the initial transmission, and let the partial spectrum used for retransmission be the Mth partial spectrum from m of the initial transmission signal. At this time, when the equalized signals are simply added, the synthesized frequency signal is expressed by the following equation.
Figure JPOXMLDOC01-appb-M000001

 式(1)において、Scom(k)は、k番目のサブキャリアの合成後の振幅、Sest は、k番目のサブキャリアの初送信号の振幅、Sest Reは、k番目のサブキャリアの再送信号の振幅である。また、サブキャリアのインデックスは、信号が実際に配置された周波数から、希望信号が割り当てられた周波数信号だけを抽出するデマッピング処理を行なった後の仮想的な周波数インデックスである。このように、合成することで、重複したスペクトルのみ再送・合成することで、効率的な再送が可能となる。なお、合成法としては、単純な加算でもよいし、初送信号と再送信号の各離散周波数のスペクトルの振幅について、振幅の大きさが大きい方を選択する方法でもよいし、最大比合成のような重みづけ合成を行なってもよい。また、本実施形態では、重複したスペクトルに関する情報(周波数インデックスなど)を通知したが、予め決まったパターンで、部分スペクトルを再送してもよい。この場合は、特に通知する必要はない。
Figure JPOXMLDOC01-appb-M000001

In Equation (1), S com (k) is the amplitude of the kth subcarrier after synthesis, S est f is the amplitude of the initial transmission signal of the kth subcarrier, and S est Re is the kth subcarrier. This is the amplitude of the carrier retransmission signal. The subcarrier index is a virtual frequency index after performing a demapping process for extracting only a frequency signal to which a desired signal is assigned from a frequency at which the signal is actually arranged. As described above, by combining and retransmitting / combining only the overlapped spectrum, efficient retransmission can be performed. As a synthesis method, a simple addition may be used, a method of selecting a larger amplitude of the spectrum amplitude of each discrete frequency of the initial transmission signal and the retransmission signal, or a maximum ratio synthesis. Weighted synthesis may be performed. In the present embodiment, information (frequency index or the like) related to the overlapping spectrum is notified, but the partial spectrum may be retransmitted in a predetermined pattern. In this case, it is not necessary to notify in particular.
 [第2の実施形態]
 第1の実施形態は、重複した部分スペクトルのみを再送時に再配置して送信する方法について開示したが、第2の実施形態では、周波数スペクトルを周波数軸でサイクリックシフト(モジュロ、剰余)することで、重複する部分スペクトルを再配置する。
[Second Embodiment]
Although the first embodiment discloses a method of rearranging and transmitting only overlapping partial spectra at the time of retransmission, in the second embodiment, the frequency spectrum is cyclically shifted (modulo, remainder) on the frequency axis. Then, the overlapping partial spectrum is rearranged.
 図5は、本発明の第2の実施形態に係る再送方法の概念の一例を示す図である。同図に示されるように、再送時に周波数信号をサイクリックシフトする。ここでは、重複する周波数に配置されていた部分スペクトル4が、それぞれ第1の移動局装置101-1の再送信号41では部分スペクトル42、第2の移動局装置101-2の再送信号43では部分スペクトル44に配置されるようにサイクリックシフトしたものとする。これにより、再送時に初送と同じ部分スペクトルが重複する確率が低くなるため、再送効率が高まる。 FIG. 5 is a diagram illustrating an example of a concept of a retransmission method according to the second embodiment of the present invention. As shown in the figure, the frequency signal is cyclically shifted at the time of retransmission. Here, partial spectrums 4 arranged at overlapping frequencies are partially spectrumd 42 in retransmission signal 41 of first mobile station apparatus 101-1 and partially transmitted in retransmission signal 43 of second mobile station apparatus 101-2. It is assumed that a cyclic shift is performed so as to be arranged in the spectrum 44. Thereby, since the probability that the same partial spectrum as the initial transmission overlaps at the time of retransmission decreases, retransmission efficiency increases.
 図6は、本発明の第2の実施形態に係る移動局装置101の構成の一例を示すブロック図である。基本的には図2の構成と同じだが、図2の部分スペクトル抽出部13がモジュロ部51になっており、これが本実施形態の特徴である。否定応答を検出した場合には、モジュロ部51により、制御信号検出部113により検出されたサイクリックシフト量と再送信号生成部12から出力された初送信号と同じ周波数信号にサイクリックシフトを与える。u番目の移動局装置101に与えられるサイクリックシフト量をK(u)、u番目の移動局装置101の元の信号帯域幅をNDFT(u)とすると、サイクリックシフトしたk番目の周波数における周波数信号の複素数で表される振幅Scyc(u,k)は式(2)で表される。 FIG. 6 is a block diagram showing an example of the configuration of the mobile station apparatus 101 according to the second embodiment of the present invention. Although basically the same as the configuration of FIG. 2, the partial spectrum extraction unit 13 of FIG. 2 is a modulo unit 51, which is a feature of the present embodiment. When a negative response is detected, the modulo unit 51 gives a cyclic shift to the same frequency signal as the cyclic transmission amount detected by the control signal detection unit 113 and the initial transmission signal output from the retransmission signal generation unit 12. . If the cyclic shift amount given to the u th mobile station apparatus 101 is K (u) and the original signal bandwidth of the u th mobile station apparatus 101 is N DFT (u), the cyclically shifted k th frequency. The amplitude S cyc (u, k) represented by the complex number of the frequency signal at is expressed by Equation (2).
Figure JPOXMLDOC01-appb-M000002

 ただし、kは0からNDFT(u)-1までの自然数、S(u,k)はu番目の移動局装置101の元の周波数信号のk番目の周波数における周波数信号の複素数で表される振幅である。
Figure JPOXMLDOC01-appb-M000002

Here, k is a natural number from 0 to N DFT (u) −1, and S (u, k) is represented by a complex number of frequency signals at the k-th frequency of the original frequency signal of the u-th mobile station apparatus 101. Amplitude.
 後述するサイクリックシフト算出部61-1~61-Uでは、式(2)の処理ができるようK(u)を原則として移動局装置101毎に設定する。この設定方法としては、原則として初送で重複した部分スペクトルが再送時に重複しないようにする。なお、重複したスペクトルがどの周波数であるかは、基地局装置103における移動局装置101からの受信信号の受信信号対雑音電力比(SNR:Signal to Noise power Ratio)に基づいてもよい。さらに、雑音に干渉を含んだSINR(Signal to Interference plus Noise power Ratio)に基づいてもよい。これにより、SORMにおける再送効率が高まる。また、本実施形態はサイクリックシフトだが、ミラーリングのように、周波数配置を初送信号の周波数順を反転させてもよい。 In cyclic shift calculation units 61-1 to 61-U, which will be described later, in principle, K (u) is set for each mobile station apparatus 101 so that the processing of equation (2) can be performed. As a setting method, as a general rule, partial spectra that are duplicated in the initial transmission are not duplicated during retransmission. Note that the frequency of the overlapping spectrum may be based on a received signal-to-noise power ratio (SNR) of the received signal from the mobile station apparatus 101 in the base station apparatus 103. Furthermore, it may be based on SINR (Signal to Interference plus Noise power Ratio) including interference in noise. This increases the retransmission efficiency in the SORM. Further, although this embodiment is a cyclic shift, the frequency arrangement of the initial transmission signal may be reversed as in the case of mirroring.
 図7は、本発明の第2の実施形態に係る基地局装置103の構成の一例を示すブロック図である。基本的には図3の構成と同一であるが、モジュロするための、サイクリックシフト算出部61-1~61-Uが追加されており、これが本実施形態のポイントである。サイクリックシフト算出部61-1~61-Uでは、重複周波数検出部23-1~23-Uで検出された重複している周波数の情報から、サイクリックシフトする量を算出する。このサイクリックシフトする量は、全移動局装置101で同時に同じだけの量に設定してもよいし、移動局装置101ごとに決定してもよい。ここでは、その設定方法の一例について説明する。まず、ある移動局装置101において、デマッピング後の仮想的なサブキャリアのp番目からP番目の周波数信号が他の移動局装置101と重複したものとする。この場合、p番目からP番目の周波数信号が再送で重複しない可能性が高くなるよう、pだけサイクリックシフトするように設定する。 FIG. 7 is a block diagram showing an example of the configuration of the base station apparatus 103 according to the second embodiment of the present invention. Although basically the same as the configuration of FIG. 3, cyclic shift calculation units 61-1 to 61-U for modulo are added, and this is the point of this embodiment. The cyclic shift calculation units 61-1 to 61-U calculate the amount of cyclic shift from the overlapping frequency information detected by the overlapping frequency detection units 23-1 to 23-U. The amount of cyclic shift may be set to the same amount for all mobile station apparatuses 101 at the same time, or may be determined for each mobile station apparatus 101. Here, an example of the setting method will be described. First, in a certain mobile station apparatus 101, it is assumed that p-th to P-th frequency signals of virtual subcarriers after demapping overlap with other mobile station apparatuses 101. In this case, the p-th to P-th frequency signals are set to be cyclically shifted by p so that there is a high possibility that the p-th to P-th frequency signals will not overlap in retransmission.
 図8は、本発明の第2の実施形態に係るサイクリックシフト設定方法を具体的に示す概念図である。なお、本発明は重複したスペクトルを高い精度で再送することを本質としているため、重複したスペクトルが再び重複する確率を低くするような再送方法は本発明に含まれる。データ検出・合成部21の基本的な構成については、図4と同一であるが、合成処理は、モジュロによりサイクリックシフトしたスペクトルを元の順番に戻した上で、合成を行なう。なお、この合成処理については、具体的に記載していないが、スペクトルを元に戻し、初送信号と再送信号を合成するというのは技術的常識であり、本発明の本質は、SORMにおいて再送する際に重複したスペクトルが再送時になるべく重複しないよう制御または重複する確率を低くすることである。なお、これまで述べた実施形態はSORMを前提としたが、複数の移動局装置101からの信号を空間多重するマルチユーザMIMOにも勿論適用できる。 FIG. 8 is a conceptual diagram specifically showing the cyclic shift setting method according to the second embodiment of the present invention. Note that the present invention is based on the essence of retransmitting duplicated spectrums with high accuracy, and therefore a retransmission method that reduces the probability that duplicated spectra are duplicated again is included in the present invention. The basic configuration of the data detecting / synthesizing unit 21 is the same as that shown in FIG. 4, but the synthesizing process is performed after returning the spectrum cyclically shifted by modulo to the original order. Although this combining process is not specifically described, it is technical common sense to restore the spectrum and combine the initial transmission signal and the retransmission signal, and the essence of the present invention is the resending in the SORM. In this case, the control or the probability of overlapping is made low so that the overlapping spectrum does not overlap as much as possible at the time of retransmission. Although the embodiments described so far are based on SORM, it is of course applicable to multi-user MIMO in which signals from a plurality of mobile station apparatuses 101 are spatially multiplexed.
 本発明に関わる移動局装置101および基地局装置103で動作するプログラムは、本発明に関わる上記実施形態の機能を実現するように、CPU等を制御するプログラム(コンピュータを機能させるプログラム)である。そして、これら装置で取り扱われる情報は、その処理時に一時的にRAMに蓄積され、その後、各種ROMやHDDに格納され、必要に応じてCPUによって読み出し、修正・書き込みが行なわれる。プログラムを格納する記録媒体としては、半導体媒体(例えば、ROM、不揮発性メモリカード等)、光記録媒体(例えば、DVD、MO、MD、CD、BD等)、磁気記録媒体(例えば、磁気テープ、フレキシブルディスク等)等のいずれであってもよい。また、ロードしたプログラムを実行することにより、上述した実施形態の機能が実現されるだけでなく、そのプログラムの指示に基づき、オペレーティングシステムあるいは他のアプリケーションプログラム等と共同して処理することにより、本発明の機能が実現される場合もある。 The program that operates in the mobile station apparatus 101 and the base station apparatus 103 related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention. Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.
 また市場に流通させる場合には、可搬型の記録媒体にプログラムを格納して流通させたり、インターネット等のネットワークを介して接続されたサーバコンピュータに転送したりすることができる。この場合、サーバコンピュータの記憶装置も本発明に含まれる。また、上述した実施形態における移動局装置101および基地局装置103の一部、または全部を典型的には集積回路であるLSIとして実現してもよい。移動局装置101および基地局装置103の各機能ブロックは個別にチップ化してもよいし、一部、または全部を集積してチップ化してもよい。また、集積回路化の手法はLSIに限らず専用回路、または汎用プロセッサで実現しても良い。また、半導体技術の進歩によりLSIに代替する集積回路化の技術が出現した場合、当該技術による集積回路を用いることも可能である。 Also, when distributing to the market, the program can be stored and distributed on a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention. Moreover, you may implement | achieve part or all of the mobile station apparatus 101 in the embodiment mentioned above and the base station apparatus 103 as LSI which is typically an integrated circuit. Each functional block of the mobile station apparatus 101 and the base station apparatus 103 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.
 以上、この発明の実施形態を、図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計等も特許請求の範囲に含まれる。 The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope not departing from the gist of the present invention are also claimed. Included in the range.
1、2 送信信号
3 受信信号
4 部分スペクトル
5、7 再送信号
6、8 部分スペクトル
11 応答信号検出部
12 再送信号生成部
13 部分スペクトル抽出部
14 初送/再送切替部
21、21-1~21-U データ検出・合成部
22-1~22-U 誤り検出部
23-1~23-U 重複周波数検出部
24-1~24-U 応答信号生成部
31-U 等化部
32-U 初送信号保持部
33-U 合成部
34-U 切替部
35-U IDFT部
36-U 復調部
37-U 復号部
41、43 再送信号
42、44 部分スペクトル
51 モジュロ部
61-1~61-U サイクリックシフト算出部
101、101-1、101-2 移動局装置
102-1、102-2 送信信号
103 基地局装置
104 受信信号
104-A 部分スペクトル
111 アンテナ
112 無線受信部
113 制御信号検出部
114 データ信号生成部
115 参照信号生成部
116 参照信号多重部
117 周波数割当部
118 IFFT部
119 CP挿入部
120 無線送信部
201 アンテナ
202 無線受信部
203 CP除去部
204 FFT部
205 参照信号分離部
206-1~206-U 伝搬路特性・雑音電力推定部
207 信号キャンセル部
208 周波数デマッピング部
209-1~209-U データ検出部
210-1~210-U 軟推定生成部
211-1~211-U 制御情報生成部
212 無線送信部
1, 2 Transmission signal 3 Reception signal 4 Partial spectrum 5, 7 Retransmission signal 6, 8 Partial spectrum 11 Response signal detection unit 12 Retransmission signal generation unit 13 Partial spectrum extraction unit 14 Initial transmission / retransmission switching unit 21, 21-1 to 21 -U Data detection / combination units 22-1 to 22-U Error detection units 23-1 to 23-U Overlapping frequency detection units 24-1 to 24-U Response signal generation unit 31-U Equalization unit 32-U Initial transmission Signal holding unit 33-U Combining unit 34-U Switching unit 35-U IDFT unit 36-U Demodulating unit 37-U Decoding unit 41, 43 Retransmission signal 42, 44 Partial spectrum 51 Modulo unit 61-1 to 61-U Cyclic Shift calculation units 101, 101-1 and 101-2 Mobile station apparatuses 102-1 and 102-2 Transmission signal 103 Base station apparatus 104 Reception signal 104-A Partial spectrum 111 Antenna 112 Radio Reception unit 113 Control signal detection unit 114 Data signal generation unit 115 Reference signal generation unit 116 Reference signal multiplexing unit 117 Frequency allocation unit 118 IFFT unit 119 CP insertion unit 120 Radio transmission unit 201 Antenna 202 Radio reception unit 203 CP removal unit 204 FFT unit 205 Reference signal demultiplexing units 206-1 to 206-U Propagation path characteristic / noise power estimation unit 207 Signal cancellation unit 208 Frequency demapping units 209-1 to 209-U Data detection units 210-1 to 210-U Soft estimation generation unit 211-1 to 211 -U Control information generation unit 212 Wireless transmission unit

Claims (16)

  1.  複数の第1の通信装置が第2の通信装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムであって、
     前記各第1の通信装置が前記第2の通信装置に対して再送信号を送信する場合は、初送信号の一部である部分スペクトルのみを前記第2の通信装置に対して送信することを特徴とする無線通信システム。
    A wireless communication system that allows a part or all of frequencies used when a plurality of first communication devices transmit a radio signal to a second communication device,
    When each of the first communication devices transmits a retransmission signal to the second communication device, only the partial spectrum that is a part of the initial transmission signal is transmitted to the second communication device. A wireless communication system.
  2.  前記部分スペクトルは、前記各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルであることを特徴とする請求項1記載の無線通信システム。 The wireless communication system according to claim 1, wherein the partial spectrum is a spectrum arranged at an overlapping frequency when each of the first communication devices transmits an initial transmission signal.
  3.  前記部分スペクトルは、前記第2の通信装置において、前記各第1の通信装置から受信した無線信号の受信SNR(Signalto Noise power Ratio)または受信SINR(Signal to Interferenceplus Noise power Ratio)に基づいて設定されることを特徴とする請求項1記載の無線通信システム。 The partial spectrum is set in the second communication device based on a reception SNR (Signalto Noise power Ratio) or a reception SINR (Signal toInterferenceplus Noise power Ratio) of the radio signal received from each of the first communication devices. The wireless communication system according to claim 1.
  4.  いずれかの前記第1の通信装置は、いずれか他の前記第1の通信装置が使用する周波数とは重複しない周波数に配置された部分スペクトルを前記第2の通信装置に対して送信することを特徴とする請求項1記載の無線通信システム。 Any one of the first communication devices transmits a partial spectrum arranged at a frequency not overlapping with a frequency used by any other first communication device to the second communication device. The wireless communication system according to claim 1.
  5.  複数の第1の通信装置が第2の通信装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムであって、
     前記各第1の通信装置が前記第2の通信装置に対して再送信号を送信する場合は、再送信号を周波数軸上でサイクリックシフトして前記第2の通信装置に対して送信することを特徴とする無線通信システム。
    A wireless communication system that allows a part or all of frequencies used when a plurality of first communication devices transmit a radio signal to a second communication device,
    When each first communication device transmits a retransmission signal to the second communication device, the retransmission signal is cyclically shifted on the frequency axis and transmitted to the second communication device. A wireless communication system.
  6.  前記再送信号を周波数軸上でサイクリックシフトする量は、前記第2の通信装置において、前記各第1の通信装置が初送信号を送信した際に重複した周波数に配置されたスペクトルに基づいて決定されることを特徴とする請求項5記載の無線通信システム。 The amount by which the retransmission signal is cyclically shifted on the frequency axis is based on the spectrum arranged in the overlapping frequency when each first communication device transmits the initial transmission signal in the second communication device. 6. The wireless communication system according to claim 5, wherein the wireless communication system is determined.
  7.  前記再送信号を周波数軸上でサイクリックシフトする量は、前記第2の通信装置において、前記各第1の通信装置から受信した無線信号の受信SNR(Signal to Noise power Ratio)または受信SINR(Signalto Interference plus Noise power Ratio)に基づいて設定されることを特徴とする請求項5記載の無線通信システム。 The amount by which the retransmission signal is cyclically shifted on the frequency axis is determined by the second communication device by the reception SNR (Signal to Noise power Ratio) or the reception SINR (SignaltoR) of the radio signal received from each of the first communication devices. 6. The wireless communication system according to claim 5, wherein the wireless communication system is set based on (Interference plus Noise power Ratio).
  8.  いずれかの前記第1の通信装置は、いずれか他の前記第1の通信装置が使用する周波数とは重複しないように、再送信号を周波数軸上でサイクリックシフトして前記第2の通信装置に対して送信することを特徴とする請求項5記載の無線通信システム。 Any one of the first communication devices cyclically shifts a retransmission signal on the frequency axis so as not to overlap with a frequency used by any other first communication device, and the second communication device. The wireless communication system according to claim 5, wherein the wireless communication system is transmitted.
  9.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置であって、
     前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する判定部と、
     前記判定の結果、誤りがあった場合は、前記各通信端末装置が初送信号を送信した際に重複した周波数を検出する重複周波数検出部と、を備え、
     前記検出した周波数を示す情報を、前記各通信端末装置に送信することを特徴とする通信制御装置。
    A communication control apparatus applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to a communication control apparatus,
    A determination unit that determines whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices;
    If there is an error as a result of the determination, the communication terminal device includes an overlapping frequency detection unit that detects an overlapping frequency when transmitting an initial transmission signal,
    A communication control apparatus that transmits information indicating the detected frequency to each of the communication terminal apparatuses.
  10.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置であって、
     前記通信制御装置から受信した応答信号を検出する応答信号検出部と、
     前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出する部分スペクトル抽出部と、を備え、
     前記抽出した部分スペクトルのみを再送信号として前記通信制御装置に対して送信することを特徴とする通信端末装置。
    A communication terminal device applied to a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal devices transmit a radio signal to a communication control device,
    A response signal detector for detecting a response signal received from the communication control device;
    When the detected response signal is NACK (Negative Acknowledge), partial spectrum extraction that extracts a partial spectrum that is a part of the initial transmission signal based on the information indicating the overlapping frequency received from the communication control device And comprising
    A communication terminal apparatus, wherein only the extracted partial spectrum is transmitted as a retransmission signal to the communication control apparatus.
  11.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置であって、
     前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する判定部と、
     前記判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出するサイクリックシフト算出部と、を備え、
     前記算出したサイクリックシフト量を示す情報を、前記各通信端末装置に送信することを特徴とする通信制御装置。
    A communication control apparatus applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to a communication control apparatus,
    A determination unit that determines whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices;
    If there is an error as a result of the determination, a cyclic shift calculation unit that calculates a cyclic shift amount on the frequency axis, and
    A communication control apparatus that transmits information indicating the calculated cyclic shift amount to each of the communication terminal apparatuses.
  12.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置であって、
     前記通信制御装置から受信した応答信号を検出する応答信号検出部と、
     前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行なうモジュロ部と、を備え、
     前記サイクリックシフトした再送信号を前記通信制御装置に対して送信することを特徴とする通信端末装置。
    A communication terminal device applied to a wireless communication system that allows a part or all of the frequencies used when a plurality of communication terminal devices transmit a radio signal to a communication control device,
    A response signal detector for detecting a response signal received from the communication control device;
    When the detected response signal is NACK (Negative Acknowledge), based on the information indicating the cyclic shift amount received from the communication control device, a modulo unit that cyclically shifts the retransmission signal on the frequency axis; With
    A communication terminal apparatus that transmits the cyclic-shifted retransmission signal to the communication control apparatus.
  13.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置の制御プログラムであって、
     前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する処理と、
     前記判定の結果、誤りがあった場合は、前記各通信端末装置が初送信号を送信した際に重複した周波数を検出する処理と、
     前記検出した周波数を示す情報を、前記各通信端末装置に送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴とする制御プログラム。
    A control program for a communication control apparatus applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to a communication control apparatus. ,
    A process of determining whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices;
    As a result of the determination, if there is an error, a process of detecting a duplicate frequency when each communication terminal apparatus transmits an initial transmission signal;
    A control program characterized in that a series of processes including a process of transmitting information indicating the detected frequency to each of the communication terminal devices is commanded to be readable and executable by a computer.
  14.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置の制御プログラムであって、
     前記通信制御装置から受信した応答信号を検出する処理と、
     前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信した重複した周波数を示す情報に基づいて、初送信号の一部である部分スペクトルを抽出する処理と、
     前記抽出した部分スペクトルのみを再送信号として前記通信制御装置に対して送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴とする制御プログラム。
    A communication terminal device control program applied to a wireless communication system that allows a part or all of frequencies used when a plurality of communication terminal devices transmit wireless signals to a communication control device. ,
    Processing for detecting a response signal received from the communication control device;
    When the detected response signal is NACK (Negative Acknowledge), based on the information indicating the overlapping frequency received from the communication control device, a process of extracting a partial spectrum that is a part of the initial transmission signal;
    A control program characterized in that a series of processes including a process of transmitting only the extracted partial spectrum as a retransmission signal to the communication control apparatus is commanded to be readable and executable by a computer.
  15.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信制御装置の制御プログラムであって、
     前記各通信端末装置から受信した無線信号の復号結果に誤りがあるか否かを判定する処理と、
     前記判定の結果、誤りがあった場合は、周波数軸上のサイクリックシフト量を算出する処理と、
     前記算出したサイクリックシフト量を示す情報を、前記各通信端末装置に送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴とする制御プログラム。
    A control program for a communication control apparatus applied to a radio communication system that allows a part or all of frequencies used when a plurality of communication terminal apparatuses transmit radio signals to a communication control apparatus. ,
    A process of determining whether or not there is an error in the decoding result of the radio signal received from each of the communication terminal devices;
    As a result of the determination, if there is an error, a process of calculating a cyclic shift amount on the frequency axis;
    A control program characterized in that a series of processes including a process of transmitting information indicating the calculated cyclic shift amount to each of the communication terminal devices is converted into a command that can be read and executed by a computer.
  16.  複数の通信端末装置が通信制御装置に対して無線信号を送信する際に使用する周波数の一部または全部が重複することを許容する無線通信システムに適用される通信端末装置の制御プログラムであって、
     前記通信制御装置から受信した応答信号を検出する処理と、
     前記検出した応答信号が、NACK(Negative Acknowledge)である場合は、前記通信制御装置から受信したサイクリックシフト量を示す情報に基づいて、再送信号を周波数軸上でサイクリックシフトを行なう処理と、
     前記サイクリックシフトした再送信号を前記通信制御装置に対して送信する処理と、の一連の処理を、コンピュータに読み取り可能および実行可能にコマンド化したことを特徴とする制御プログラム。
    A communication terminal device control program applied to a wireless communication system that allows a part or all of frequencies used when a plurality of communication terminal devices transmit wireless signals to a communication control device. ,
    Processing for detecting a response signal received from the communication control device;
    When the detected response signal is NACK (Negative Acknowledge), based on the information indicating the cyclic shift amount received from the communication control device, a process of cyclically shifting the retransmission signal on the frequency axis;
    A control program characterized in that a series of processes including a process of transmitting the cyclic-shifted retransmission signal to the communication control apparatus is commanded to be readable and executable by a computer.
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