WO2011016489A1 - 通信システム、通信方法及び基地局 - Google Patents

通信システム、通信方法及び基地局 Download PDF

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Publication number
WO2011016489A1
WO2011016489A1 PCT/JP2010/063195 JP2010063195W WO2011016489A1 WO 2011016489 A1 WO2011016489 A1 WO 2011016489A1 JP 2010063195 W JP2010063195 W JP 2010063195W WO 2011016489 A1 WO2011016489 A1 WO 2011016489A1
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WIPO (PCT)
Prior art keywords
base station
mobile station
data signal
signal
unit
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Ceased
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PCT/JP2010/063195
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English (en)
French (fr)
Japanese (ja)
Inventor
貴司 吉本
寿之 示沢
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Sharp Corp
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Sharp Corp
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Priority to US13/388,895 priority Critical patent/US8971265B2/en
Publication of WO2011016489A1 publication Critical patent/WO2011016489A1/ja
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Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information

Definitions

  • the present invention relates to a communication system and the like including a mobile station transmitting a data signal and a plurality of base stations receiving the data signal transmitted by the mobile station.
  • the communication area can be expanded by providing a cellular configuration in which a plurality of areas covered by a base station (eNodeB) are arranged in a cell (referred to as a cellular system).
  • a base station eNodeB
  • a mobile station mobile terminal, UE (User Equipment)
  • UE User Equipment
  • LTE Long Term Evolution
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • DFT-spread OFDM Discrete Fourier Transform-spread Orthogonal Frequency Division
  • CP Cyclic Prefix
  • the CP is a guard interval added to the head of effective symbols to avoid the influence of multipath fading in multicarrier transmission such as OFDM transmission, and in the OFDMA and SC-FDMA, the head of OFDMA symbols and SC-FDMA symbols. It is a guard interval added to.
  • multiplexing (multiple access) between mobile stations can be performed based on a region (for example, resource block) in which resources are divided in the frequency direction or the time direction. Therefore, in the uplink, the propagation distance of each mobile station to the base station is different depending on the relative position of the base station and the mobile station.
  • the mobile station 1000-1 and the mobile station 1000-2 select to connect to the base station 2000
  • the mobile station 1000-3 and the mobile station 1000-4 select to connect to the base station 3000.
  • An example of t 12 is time time signal which the mobile station 1000-1 transmits arrives at the base station 2000
  • t 22 is the signal that the mobile station 1000-2 transmits arrives at the base station 2000
  • t 33 is the mobile station 1000-3
  • time transmitted signal arrives at the base station 3000
  • t 43 is the time when the signal which the mobile station 1000-4 transmits arrives at the base station 3000.
  • base station 2000 sets
  • a control signal (timing adjustment signal, Timing Advance command) for notifying transmission timing of a data signal satisfying ⁇ tcp is transmitted, and each mobile station transmits a data signal to the base station 2000 based on the transmission timing.
  • mobile station 1000-3 and mobile station 1000-4 transmit data signals to base station 3000 at timings satisfying
  • the base station management unit 10 is a device that manages the base station 2000 and the base station 3000, and is connected to the base station via a wired network or the like. For example, it has functions such as control for performing coordinated communication between base stations and handover control.
  • the base station 2000 and / or the base station 3000 may have the function of the base station management unit 10.
  • Non-Patent Document 1 considers CoMP (Cooperative Multipoint) transmission method as such a method.
  • FIG. 25 is a diagram showing an example in which the mobile station 100-1 located in the cell edge area performs cooperative communication as a CoMP transmission scheme in uplink.
  • the mobile station 100-1 is a mobile station that performs cooperative communication with the base station 200 and the base station 300.
  • t '12 is the time to signal the mobile station 100-1 transmits arrives at the base station 200
  • t' 13 is the time when the signal which the mobile station 100-1 transmits arrives at the base station 300.
  • time t '22 is a signal that the mobile station 100-2 transmits arrives at the base station 200
  • the mobile station (t ′ 33 is the time when the signal transmitted by the mobile station 100-3 arrives at the base station 300) communicating with only the station 300.
  • Mobile station 100-1 transmits the same data signal to both base station 200 and base station 300.
  • the base station 300 transmits the received data signal of the mobile station 100-1 to the base station 200 using a wired channel such as an optical fiber (for example, X2 interface in LTE), and the base station 200 transmits the data signal of the mobile station 100-1.
  • a signal detection process such as a decoding process is performed using the data signal of the mobile station 100-1 directly received from the mobile station 100-1 and the data signal of the mobile station 100-1 transmitted from the base station 300.
  • the data signal transmitted by the mobile station 100-1 is reduced in inter-cell interference and data by resource allocation scheduling and site diversity effect taking into account the channel conditions (cell environment) of both the base station 200 and the base station 300.
  • the signal power at the time of signal detection can be increased, and the transmission characteristics of the mobile station located in the cell edge region can be improved.
  • a base station that performs various controls for communication with mobile stations transmitting data signals to a plurality of base stations is called an anchor base station, and other base stations are called coordinated base stations.
  • the anchor base station may be a base station transmitting downlink control information (DCI: Downlink Control Information) through PDCCH (Physical Downlink Control CHannel).
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control CHannel
  • the channel state between mobile station 100-1 and base station 200 and the channel state between mobile station 100-1 and base station 300 are different.
  • ⁇ may not satisfy the same time tcp occur.
  • the mobile station 100-1 when the data signal transmission timing of the mobile station 100-1 is set based on the channel condition between the mobile station 100-1 and the base station 200, the mobile station 100-1 connected to the base station 200 and the mobile station 100-1 move.
  • the arrival time difference with the station 100-2 can be within the time range equal to or less than the CP length.
  • the transmission timing does not take into consideration the channel conditions of the mobile station 100-1 and the base station 300, the data signal of the mobile station 100-1 arriving at the base station 300 and the data of the mobile station 100-3
  • the arrival time difference with the signal may be equal to or greater than the CP length.
  • OFDM transmission there is a problem that the characteristic is degraded due to intersymbol interference and intercarrier interference.
  • characteristic degradation due to the breakdown of the periodicity of FFT (DFT) and characteristic degradation due to interference between signals in the FFT section (inter-block interference) occur.
  • Non-Patent Document 2 there is a method of extending the CP length together with a new transmission timing control method assuming cooperative communication so that the problem regarding the delay does not occur when cooperative communication is performed in the uplink. Have been described. By this method, interference is suppressed by keeping the arrival time difference within the CP length.
  • Non-Patent Document 2 since CP longer than usual is used when performing cooperative communication, there is a problem that the insertion loss of the CP increases and the transmission efficiency decreases. In addition, there is also a problem that the addition of a control signal accompanied by the switching of the CP length lowers the transmission efficiency and complicates control.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a communication system or the like in which good transmission characteristics can be obtained without adding a CP length longer than usual, in uplink coordinated communication. It is to do.
  • a communication system is a communication system including a mobile station transmitting a data signal and a plurality of base stations receiving a data signal transmitted by the mobile station.
  • a first base station including a first signal detection unit that detects a data signal transmitted by the mobile station; and the first base station that detects a data signal transmitted by the mobile station.
  • the mobile station is characterized by including at least one second base station including a second signal detection unit that detects a data signal transmitted by the mobile station using the result.
  • the second signal detection unit uses the detection result detected by the first base station to move the data signal among the data signals received by the second base station. It is characterized by removing the data signal transmitted by the station.
  • the second base station further includes a decoding unit that performs a decoding process on the result of detection of the data signal transmitted by the mobile station by the second signal detection unit,
  • the second signal detection unit detects the data signal transmitted by the mobile station using the detection result of the decoding process.
  • the first base station detects the data signal transmitted by the mobile station by the first signal detection unit, and the second signal detection unit detects the mobile station. And a synthesis unit that synthesizes the data signal transmitted by the unit with the detection result of the data signal.
  • the second base station detects the data signal transmitted by the mobile station by the first signal detection unit, and the second signal detection unit detects the second signal by the mobile station.
  • the apparatus further comprises a combining unit that combines the transmitted data signal with the detection result.
  • the mobile station transmits a transmission timing measurement signal for measuring a timing at which the mobile station transmits a data signal to the first base station and the second base station. It is characterized by
  • the first base station is a control signal that generates correction information of timing when the mobile station transmits a data signal based on reference timing held by the first base station.
  • the mobile station includes a generation unit and a wireless unit that transmits a control signal including correction information of the timing, and the mobile station transmits a data signal according to resource allocation information based on transmission timing correction information notified by the control signal. It is characterized by
  • the second base station is characterized by using the resource allocation information to determine whether a timing of receiving a data signal transmitted by a mobile station exceeds a GI length. Do.
  • the second base station requests the first base station to transmit a result of detection of a data signal transmitted by the mobile station.
  • the second base station is a control signal that generates correction information of timing when the mobile station transmits a data signal based on reference timing held by the first base station.
  • the mobile station includes a generation unit and a wireless unit that transmits a control signal including correction information of the timing, and the mobile station transmits a data signal according to resource allocation information based on transmission timing correction information notified by the control signal. It is characterized by
  • the second base station is characterized by using the resource allocation information to determine whether the timing of receiving a data signal transmitted by the mobile station exceeds a GI length. I assume.
  • the second base station requests the first base station to transmit a result of detection of a data signal transmitted by the mobile station.
  • the first base station is a decoding unit that performs a decoding process on a result detected by the first signal detection unit, and a result that the decoding unit performs a decoding process. And a higher layer for transferring, to the second base station, a decoding processing result on the data signal transmitted by the mobile station.
  • the second signal detection unit receives a data signal of a mobile station received by the own station from a result of detection of a data signal transmitted by the mobile station by the first base station.
  • the apparatus may further include a replica generation unit that generates a signal replica, and an interference removal unit that subtracts the received signal replica from the data signal.
  • the second signal detection unit generates a replica of a reception signal of a data signal of a communication apparatus other than the mobile station received by the own station from the result of the decoding process of the decoding unit.
  • an interference removing unit that subtracts the received signal replica from the data signal.
  • a communication method is a communication method in a communication system including a mobile station transmitting a data signal and at least first and second base stations receiving a data signal transmitted by the mobile station.
  • a base station is connected to a communication system including a mobile station transmitting a data signal and another base station including a first signal detection unit detecting a data signal transmitted by the mobile station.
  • a second station wherein the other base station detects a data signal received by the own station using a detection result of the first base station detecting a data signal transmitted by the mobile station;
  • a signal detection unit is provided.
  • the base station receiving the same data signal detects the signal detection results of other base stations receiving the same data signal. It is used to detect the same data signal. Therefore, even when the reception timing of the signal from the mobile station transmitting the same data signal becomes so large as to exceed the GI length with respect to the reception timing of the signal from the other mobile station, between the reception signals from the mobile station Interference due to reception timing can be suppressed, and characteristic degradation can be reduced without introducing a long CP.
  • a communication system comprises a mobile station that transmits the same data signal to a plurality of base stations in the uplink, and the plurality of base stations cooperate to perform a data signal detection process of the mobile station.
  • a mobile station that transmits the same data signal to the plurality of base stations is called a coordinated mobile station.
  • the mobile station in a communication system in which a mobile station (mobile terminal) transmits the same data signal to one anchor base station (Serving base station) and a cooperative base station, the mobile station In this case, the transmission timing is set by the reference timing of the anchor base station.
  • three mobile stations 100-n (n 1, 2, 3) exist in the cell formed by the two base stations (base stations 200 and 300) shown in FIG. 25, and one of the mobile stations The case where one mobile station 100-1 transmits data signals to both base stations will be described. Further, although a case where SC-FDMA is used as a transmission method will be described below, the present invention is not limited to this.
  • FIG. 1 is a schematic block diagram showing the configuration of the mobile station 100-n in the first embodiment.
  • the mobile station 100-n includes an upper layer 101, a coding unit 102, a puncturing unit 103, a scrambling unit 104, a modulation unit 105, a DFT unit 106, a mapping unit 107, an IFFT unit 108, a GI insertion unit (CP insertion unit) 109, a radio
  • the unit 110 includes a transmission antenna unit 111, a reference signal generation unit 112, a control signal detection unit 113, a radio unit 114, and a reception antenna unit 115.
  • the upper layer 101 is a portion having a function located in the upper layer such as a MAC (Media Access Control, medium access control) layer, a network layer, etc., and transmits information data and / or control data to be transmitted in uplink to the encoding unit 102. input.
  • MAC Media Access Control, medium access control
  • the encoding unit 102 encodes the input data using an error correction code such as convolutional code, turbo code, low density parity check (LDPC) code, etc., and generates coded bits. .
  • error correction code such as convolutional code, turbo code, low density parity check (LDPC) code, etc.
  • the puncturing unit 103 performs puncturing processing on the coded bits output from the coding unit 102 in accordance with the MCS (Modulation and Coding Scheme) of the signal transmitted by the mobile station 100-n.
  • the puncturing process may be different for each transmission destination (for each base station).
  • the scrambling unit 104 performs scrambling processing by multiplying the signal output from the puncturing unit 103 by a data sequence specific to the mobile station.
  • the data sequence is a pseudo noise sequence.
  • the modulator 105 maps the signal output from the scrambler 104 on a modulation symbol such as PSK (Phase Shift Keying) or QAM (Quadrature Amplitude Modulation).
  • PSK Phase Shift Keying
  • QAM Quadrature Amplitude Modulation
  • the DFT unit 106 performs DFT processing (discrete Fourier transform processing) on the modulation symbol output from the modulation unit 105.
  • the mapping unit 107 maps the output signal of the DFT unit 106 and the reference signal generated by the reference signal generation unit 112 onto the determined resource (resource element), and the mapped signal is frequency-time transformed by the IFFT unit 108. .
  • the resource is a unit for arranging the output signal of the DFT unit 106 and the reference signal, which is composed of one subcarrier and one SC-FDMA symbol in a frame transmitted by the mobile station 100-n.
  • the reference signal is a signal used for propagation path estimation, and is a signal known in the communication system to which it belongs.
  • the reference signal may be different depending on the application, for example, a reference signal (SRS: Sounding Reference Signal) for channel state measurement for performing resource allocation scheduling in uplink, or a data signal transmitted by a mobile station as a base
  • SRS Sounding Reference Signal
  • DMRS Demodulation Reference Signal
  • the demodulation reference signal may be inserted into a signal before the DFT unit 106.
  • the GI insertion unit 109 adds a guard interval to the time signal generated by the IFFT unit 108.
  • the signal output from the GI insertion unit 109 is subjected to digital / analog conversion (D / A conversion), waveform shaping by a transmission filter, conversion to a radio frequency in the radio unit 110, and transmitted from the transmission antenna unit 111.
  • D / A conversion digital / analog conversion
  • the signal output from the GI insertion unit 109 that is, the section output by the IFFT unit 108 and the GI section added by the GI insertion section 109 are collectively called an SC-FDMA symbol.
  • the receiving antenna unit 115 receives the signal transmitted by the base station, converts the radio frequency to baseband by the wireless unit 114, limits the band by the receiving filter, and performs analog / digital conversion (A / D conversion), and outputs it as a received signal Be done.
  • the control signal detection unit 113 detects a control signal among the received signals, and notifies the upper layer 101 of control information.
  • the control information includes uplink transmission timing information (Timing Advance Command).
  • the mobile station 100-1 (cooperative mobile station) receives a control signal including the transmission timing information from a base station 200 (an anchor base station, which will be described later).
  • the mobile station 100-2 receives a control signal including the transmission timing information from the base station 200.
  • the mobile station 100-3 receives a control signal including the transmission timing information from the base station 300.
  • the scrambler 104, the modulator 105, the DFT unit 106, the mapping unit 107, the IFFT unit 108, the GI insertion unit 109, the radio unit 110, and the transmission antenna unit 111 correspond to the number of base stations to which the mobile station 100-n is connected. It is also possible to provide a system.
  • FIG. 2 is a schematic block diagram showing the configuration of the base station 200 (anchor base station) in the first embodiment.
  • the base station 200 includes a reception antenna unit 201, a radio unit 202, a signal detection unit 203, a descrambling unit 205, a combining unit 206, a depuncture unit 207, a decoding unit 208, an upper layer 209, a propagation path estimation unit 210, and a transmission antenna unit 211.
  • a radio unit 212, a control signal generation unit 213, and a coded bit LLR storage unit 214 are examples of the base station 200 (anchor base station) in the first embodiment.
  • the base station 200 includes a reception antenna unit 201, a radio unit 202, a signal detection unit 203, a descrambling unit 205, a combining unit 206, a depuncture unit 207, a decoding unit 208, an upper layer 209, a propagation path estimation unit 210, and a transmission antenna unit
  • Reception antenna section 201 receives a signal transmitted from a mobile station connected to base station 200.
  • the radio unit 202 converts the signal received by the reception antenna unit 201 from radio frequency to baseband, performs band limitation by a reception filter, analog-to-digital conversion (A / D conversion), and outputs the signal as a reception signal.
  • the signal detection unit 203 performs propagation path distortion compensation of the received signal using the propagation path estimated value generated by the propagation path estimation unit 210, and then outputs the demodulation result to the descrambler.
  • FIG. 3 is a schematic block diagram showing the configuration of the signal detection unit 203.
  • the signal detection unit 203 includes a GI removal unit 231, an FFT unit 232, a filter unit 233, an IDFT unit 234, and a demodulation unit 204.
  • the GI removal unit 231 removes the GI from the received signal.
  • the FFT unit 232 transforms the signal output from the GI removing unit 231 from the time domain to the frequency domain by fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • the filter unit 233 multiplies the channel compensation weight calculated using the channel estimation value by the signal in the frequency domain output by the FFT unit.
  • the channel compensation weight may be, for example, a weighting factor based on the Minimum Mean Square Error (MMSE) standard.
  • MMSE Minimum Mean Square Error
  • the IDFT unit 234 performs IDFT (inverse discrete Fourier transform) processing on the signal output from the filter unit 233.
  • the demodulation unit 204 demaps the output signal from the IDFT unit 234, and calculates a coded likelihood LLR (Log Likelihood Ratio: soft likelihood value) which is likelihood information of bits. Note that coded bits (hard decision values) may be calculated instead of the coded bit LLRs.
  • coded likelihood LLR Log Likelihood Ratio: soft likelihood value
  • the descrambling unit 205 performs a descrambling process by multiplying the encoded bit LLR after demodulation by a scrambling code sequence unique to each mobile station.
  • the coded bit LLR storage unit 214 stores the coded bit LLR after demodulation for the cooperative mobile station among the coded bit LLRs after demodulation output from the descrambling unit 205.
  • the combining unit 206 combines the coded bit LLR of the data signal of the cooperative mobile station transmitted from the cooperative base station with the coded bit LLR stored in the coded bit LLR storage unit 214. Transmission of a data signal or the like from the base station to the base station is also referred to as transfer.
  • the depuncturing unit 207 performs puncturing processing according to the MCS applied to the coded bits of the coded bit LLRs after demodulation output from the descrambler or the coded bit LLRs after demodulation output from the combining unit.
  • the decoding unit 208 performs an error correction decoding process on the coded bit LLR output from the depuncture unit 207.
  • the result of the error correction decoding process (coded bit LLR after decoding, soft decision value) is transmitted to the cooperative base station 300 in cooperation with the anchor base station 200 through the upper layer 209.
  • the error correction decoding process result may be a coded bit (hard decision value) after decoding.
  • the above-described GI removing unit 231, FFT unit 232, filter unit 233, and IDFT unit 234 are referred to as an SC-FDMA signal detection processing unit.
  • the control signal generator 213 generates a control signal (DCI) for each mobile station based on the control information for each mobile station output from the upper layer 209.
  • the control signal includes a transmission timing adjustment signal (Timing Advance Command), and is notified to the mobile station through the PDCCH.
  • the wireless unit 212 performs digital / analog conversion (D / A conversion), waveform shaping by a transmission filter, conversion to a radio frequency, and transmission from the transmission antenna unit 111. Further, although not shown, information data for the mobile station can be transmitted together with a control signal through PDSCH (Physical Downlink Shared CHannel). In addition, a control signal can also be transmitted through PDSCH. Also, OFDMA can be used as the downlink. In addition to control information from the upper layer, control information in the physical layer can also be included as a control signal.
  • PDSCH Physical Downlink Shared CHannel
  • OFDMA can be used as the downlink.
  • control information in the physical layer can also be included as a control signal.
  • FIG. 4 is a schematic block diagram showing the configuration of the base station 300 (coordinated base station) in the first embodiment.
  • the base station 300 includes a receiving antenna unit 201, a radio unit 202, a signal detection unit 303, a descrambling unit 305, a depuncture unit 207, a decoding unit 208, an upper layer 309, and a channel estimation unit 210.
  • the base station 300 is different from the base station 200 in the signal detection unit 303, the descrambling unit 305, and the upper layer 309. The following description will focus on the different portions.
  • the signal detection unit 303 uses the propagation path estimation value generated by the propagation path estimation unit 210 and the detection result of the data signal transmitted from the anchor base station (base station 200) to generate a reception signal output from the radio unit 202. A signal detection process is performed.
  • the signal detection unit 303 performs signal detection on the received signal output from the wireless unit 202 using the channel estimation value generated by the channel estimation unit 210 and the decoding result of the data signal output from the decoding unit 208. Do the processing.
  • the detection result of the data signal and the decoding result of the data signal include a coded bit LLR (soft decision value), a coded bit (hard decision value) and the like.
  • FIG. 5 is a schematic block diagram showing the configuration of the signal detection unit 303.
  • the signal detection unit 303 includes a replica generation unit 331, an interference removal unit 332, a GI removal unit 231, an FFT unit 232, a filter unit 233, an IDFT unit 234, and a demodulation unit 204.
  • the replica generation unit 331 generates a transmission signal replica of the mobile station 100-1 from the coded bit LLR of the data signal of the mobile station 100-1 transmitted from the anchor base station (base station 200).
  • the replica generation unit 331 generates a reception signal replica of the mobile station 100-1 received by the base station 300 using the transmission signal replica and the propagation path estimation value.
  • the replica generation unit 331 generates a transmission signal replica of the mobile station 100-3 from the coded bit LLR of the data signal of the mobile station 100-3 output by the decoding unit 208. Further, the replica generation unit 331 generates a reception signal replica of the mobile station 100-3 received by the base station 300 using the transmission signal replica and the propagation path estimation value.
  • the transmission signal replica of the mobile station 100-3 may be generated from the coded bit LLR of the data signal of the mobile station 100-3 output from the demodulation unit 204.
  • the interference removing unit 332 subtracts one of the received signal replicas from the received signal output from the wireless unit 202.
  • FIG. 6 is a schematic diagram in which the interference removing unit 332 removes the signal component of the mobile station 100-1.
  • the horizontal axis is time, and the vertical axis is frequency.
  • s1 and s2 are received signals output from the radio unit 202
  • s1 is a data signal component of the mobile station 100-3 received by the base station 300
  • s2 is a data signal of the mobile station 100-1 received by the base station 300. It is an ingredient.
  • the transmission timing of the mobile station 100-1 is set on the basis of the connection with the base station 200, the arrival time difference of the s1 with respect to the s2 is greater than the GI length. At this time, it is assumed that the arrival time difference between the mobile station 100-1 and the mobile station 100-2 in the base station 200 is within the GI length.
  • the interference removing unit 332 extracts the data signal component s1 of the mobile station 100-3 by removing the received signal replica for s2 generated by the replica generating unit 331 from the received signal input from the wireless unit 202.
  • the received signal replica for s2 is generated from coded bit LLRs of the data signal of the mobile station 100-1 transmitted from the anchor base station.
  • the GI removing unit 231 removes the GI interval from the signal output from the interference removing unit 332.
  • the GI interval of s1 in FIG. 6 is removed.
  • the FFT unit 232 transforms the signal output from the GI removing unit 231 from the time domain to the frequency domain by fast Fourier transform processing (FFT) according to the timing of the data signal component s1 of the mobile station 100-3. That is, the section t1 of FIG. 6 is an FFT section.
  • a signal for the data signal of the mobile station 100-3 output from the FFT unit 232 is processed by each of the filter unit 233, the IDFT unit 234, the demodulation unit 204, the descrambling unit 305, the depuncture unit 207, and the decoding unit 208, and the decoding unit
  • the coded bit LLRs after decoding of the mobile station 100-3 output from 208 are input to the upper layer 309 and the signal detection unit 303.
  • FIG. 7 is a schematic diagram in which the interference removing unit 332 removes the signal component of the mobile station 100-3.
  • the interference removal unit 332 extracts the data signal component s2 of the mobile station 100-1 by removing the received signal replica for s1 generated by the replica generation unit 331 from the wireless unit 202 from the input received signal, and removes the GI removal unit 231. Enter in The received signal replica for s 1 is generated from the coded bit LLR of the data signal of the mobile station 100-3 output from the decoding unit 208.
  • the GI removing unit 231 removes the GI interval of s2 in FIG. 6, and the FFT unit 232 performs fast Fourier transform processing according to the timing of the data signal component s2 of the mobile station 100-1 with the signal output from the GI removing unit 231. Transform from time domain to frequency domain by (FFT). That is, the section t2 of FIG. 6 is an FFT section.
  • a signal for the data signal of the mobile station 100-1 output from the FFT unit 232 is subjected to each processing in the filter unit 233, the IDFT unit 234, the demodulation unit 204 and the descrambling unit 305.
  • the coded bit LLRs after demodulation for the data signal of the mobile station 100-1 output from the descrambling unit 305 are input to the depuncturing unit 207 and the upper layer 309. Similar to the anchor base station, the above-described GI removing unit 231, FFT unit 232, filter unit 233, and IDFT unit 234 are referred to as an SC-FDMA signal detection processing unit.
  • the coded bit LLRs after demodulation for the data signal of the mobile station 100-1 may be further converted into coded bit LLRs after decoding by the decoding unit 208, and may be input to the interference removal unit 332.
  • the interference removal unit 332 performs signal detection on the mobile station 100-3 data signal again using the coded bit LLR after decoding for the data signal of the mobile station 100-1, thereby performing signal detection with higher accuracy. Is possible.
  • the upper layer 309 calculates information data by determining the coded bit LLR of the mobile station 100-3 output from the decoding unit 208. Also, the coded bit LLR of the mobile station 100-1 is transmitted to the anchor base station (base station 200). The signal transmitted to the anchor base station may be a coded bit which is a hard decision result of the coded bit LLR.
  • the coordinated base station has a transmission system for generating a control signal excluding the downlink data signal that the coordinated base station transmits to each mobile station and the control signal that controls the coordinated mobile station. It is omitted in 4.
  • the cooperative mobile station (mobile station 100-1) transmits a data signal to the anchor base station and the cooperative base station, and from the data signal transmitted to both of them, the information bit of the cooperative mobile station It is a sequence diagram which shows the operation example which acquires.
  • the anchor base station instructs the coordinated mobile station to transmit a control signal (transmission timing measurement signal, for example, random access preamble in LTE) to measure transmission timing (for example, RACH in LTE)
  • a control signal transmission timing measurement signal, for example, random access preamble in LTE
  • transmission timing for example, RACH in LTE
  • the Preamble Indicator is transmitted (S101).
  • resources for transmitting the transmission timing measurement signal and a format (for example, a preamble sequence) of the transmission timing measurement signal are indicated.
  • the cooperative mobile station transmits a transmission timing measurement signal to the anchor base station according to the control signal instructing the transmission of the transmission timing measurement signal (S102).
  • the transmission timing measurement signal is performed through a random access channel (RACH).
  • RACH random access channel
  • the cooperative mobile station can transmit the transmission timing measurement signal regardless of the presence or absence of the control signal instructing transmission of the transmission timing measurement signal.
  • PBCH Physical Broadcast CHannel
  • the anchor base station that has received the transmission timing measurement signal calculates the time difference between the transmission timing measurement signal and the reference timing held by the own base station, creates transmission timing correction information, and sets it (S103).
  • the anchor base station receives a transmission timing measurement signal from another mobile station (mobile station 100-2 in FIG. 25) that has selected connection with the base station, the anchor base station also creates transmission timing correction information for each mobile station.
  • the anchor base station is a transmission timing at which the time difference between the transmission timing measurement signal from each mobile station and the reference timing held by the anchor base station is less than or equal to the GI length for all mobile stations connected as the anchor base station. It will be corrected.
  • the reference timing held by the anchor base station is preferably the same as the reference timing held by the cooperative base station.
  • the anchor base station notifies the coordinated mobile station of the transmission timing correction information by the downlink control signal (S104).
  • the cooperative mobile station transmits uplink resource allocation request (SR: Scheduling Request) to the anchor base station according to the transmission timing notified by the transmission timing correction information (S 105).
  • uplink resource allocation requests are made via PUCCH (Physical Uplink Control CHannel).
  • the anchor base station reports uplink resource allocation information to the coordinated mobile station via PDCCH or the like (S106). At that time, the anchor base station also notifies the cooperative base station of resource allocation information for the cooperative mobile station (S107).
  • the cooperative mobile station transmits a data signal to the anchor base station and the cooperative base station based on the resource assignment information (S108 and S109).
  • the resource which transmits a data signal is scheduled so that it may not collide with the other signal of an anchor base station and a cooperation base station by another control signal.
  • the anchor base station performs detection processing on the received data signal of the coordinated mobile station (S110) to obtain coded bit LLRs.
  • the anchor base station transmits the coded bit LLR to the cooperative base station through the upper layer interface (for example, the X2 interface in LTE) (S111).
  • the upper layer interface for example, the X2 interface in LTE
  • the cooperative base station performs signal detection processing of the data signal received in S109, using the coded bit LLR received in S111 (S112).
  • the cooperative base station transmits the coded bit LLR of the data signal of the cooperative mobile station among the data signals obtained by the signal detection process to the anchor base station through the interface of the upper layer (S113).
  • the coded bit LLRs of the data signal of the other mobile station for example, the mobile station 100-3 in FIG. 25 obtained by the signal detection process are determined in the upper layer to obtain information data.
  • the anchor base station combines the coded bit LLR of the data signal from the cooperative mobile station received by the anchor base station and the coded bit LLR of the data signal of the cooperative mobile station transmitted from the cooperative base station at S113.
  • the decoding process (decoding unit 208 in FIG. 2) is performed on the synthesized coded bit LLR to calculate the coded bit LLR after decoding.
  • the anchor base station acquires the information data of the cooperative mobile station from the coded bit LLR after the decoding in the upper layer (S114).
  • the information data of each mobile station acquired by the above-mentioned is transmitted to the mobile station of transmission destination of each information data in downlink.
  • FIG. 9 is a flow chart showing an operation example related to reception processing for a data signal received from the mobile station of the anchor base station in the first embodiment.
  • the anchor base station receives data signals from a plurality of mobile stations that have selected to connect to the base station (step S201).
  • the received data signal also includes the data signal of the cooperative mobile station.
  • the anchor base station performs SC-FDMA signal detection, demodulation, descrambling processing and the like on the received data signal, and calculates coded bit LLRs after demodulation (step S202).
  • step S203 it is determined whether the coded bit LLR of the data signal of the cooperative mobile station is present among the coded bit LLRs after the demodulation.
  • step S203 when there is no coded bit LLR of the data signal of the cooperative mobile station, that is, in the case of coded bit LLR of the data signal of other than the cooperative mobile station (step S203; NO), depuncture and decoding processing is performed.
  • the coded bit LLR after decoding is calculated (step S204), and the information data of each mobile station is acquired from the coded bit LLR after the decoding (step S205).
  • step S203 if there is the coded bit LLR after demodulation, that is, if it is the coded bit LLR of the data signal of the cooperative mobile station (step S203; YES), the coded bits after demodulation of the data signal of the cooperative mobile station The LLRs are stored in the storage unit, and the coded bit LLRs after decoding of the data signal of the cooperative mobile station are calculated by performing depuncture and decoding on the coded bit LLRs after the demodulation (step S206). . Then, the coded bit LLR after decoding of the data signal of the cooperative mobile station calculated in step S206 is transmitted to the cooperative base station (step S207).
  • the anchor base station determines whether or not there is transmission of the coded bit LLR of the data signal of the cooperative mobile station received by the cooperative base station from the cooperative base station (step S208). If there is no transmission (step S208; NO), it waits for transmission (step S208; NO).
  • step S208 If there is transmission (step S208; YES), the coded bit LLR after demodulation of the data signal of the coordinated mobile station received by the coordinated base station transmitted and the data signal of the coordinated mobile station received by the anchor base station
  • the coded bit LLR after demodulation (the coded bit LLR stored in the coded bit LLR storage unit) is synthesized (step S 209).
  • depuncture processing, decoding processing and the like are performed on the coded bit LLR of the data signal of the cooperative mobile station that has been synthesized, and the coded bit LLR after decoding of the cooperative mobile station is calculated (step S204).
  • the coded bit LLRs after decoding of the cooperative mobile station are determined to obtain information data of the cooperative mobile station (step S205).
  • the anchor base station uses the received signal replica to calculate the coded bit LLRs after demodulation of the cooperative mobile station calculated by the cooperative base station, and the coded bits after demodulation of the cooperative mobile station calculated by the own station.
  • Information data of the cooperative mobile station is calculated using the LLR combined signal. As a result, it becomes possible to acquire information data of the coordinated mobile station without receiving interference due to a shift in transmission timing at the coordinated base station.
  • FIG. 10 is a flow chart showing an operation example related to reception processing for a data signal received from the mobile station of the cooperative base station in the first embodiment.
  • the cooperative base station receives data signals from a plurality of mobile stations that have selected to connect with the own base station (step S301).
  • the received data signal also includes the data signal of the cooperative mobile station.
  • step S302 it is determined whether or not there is a transmission from the anchor base station of the coded bit LLR related to the data signal of the cooperative mobile station received by the own base station (step S302). If there is no transmission (step S302; NO), the process waits for transmission.
  • step S302 the process waits for transmission.
  • the transmission of coded bit LLR from the anchor base station S 302; YES
  • the reception signal of the data signal of the cooperative mobile station received by the cooperative base station A replica is generated (step S303), and the received signal replica is removed from the received signal of the cooperative base station (the signal received in step S301) (step S304).
  • SC-FDMA signal detection, demodulation, descrambling, depuncture, and decoding are performed on the signal from which the received signal replica of the data signal of the cooperative mobile station is removed in step S304, and the mobile station other than the cooperative mobile station
  • the coded bit LLRs after decoding are calculated (step S305).
  • information data of mobile stations other than the cooperative mobile station is acquired from the coded bit LLRs after decoding of the mobile stations other than the cooperative mobile station (step S306).
  • the coded bit LLRs after decoding of mobile stations other than the cooperative mobile station are fed back to the signal detection unit (step S307).
  • the signal detection unit generates a reception signal replica of the data signal received from the mobile station other than the cooperative mobile station, using the fed back coded bit LLR after decoding (step S308).
  • the received signal replica of the data signal received from the mobile station other than the coordinated mobile station is removed from the received signal of the coordinated base station (the signal received in step S301) (step S309).
  • SC-FDMA signal detection, demodulation, and descrambling are performed on the signal from which the received signal replica has been removed in step S309, and the coordinated base station decodes the data signal received from the coordinated mobile station after the encoded bit LLR. Is calculated (step S310).
  • the coded bit LLRs after demodulation calculated in step S310 are transmitted to the anchor base station (step S311), and the process is completed.
  • the received signal replica from the cooperative mobile station generated from the coded bit LLR of the data signal of the cooperative mobile station transmitted by the anchor base station from the received signal of the cooperative base station
  • the transmission timing deviation of the cooperative mobile station that the mobile station other than the cooperative mobile station receives from the cooperative mobile station The resulting interference can be reduced, and degradation of the decoding accuracy of data signals from mobile stations other than the cooperative mobile station can be suppressed.
  • the received signal replicas received from mobile stations other than the cooperative mobile station generated from the coded bit LLRs after decoding calculated in the above steps S303 to S306 After removal from the received signal, signal detection and demodulation processing of the data signal received from the coordinated mobile station is performed to reduce interference due to a shift in transmission timing of the coordinated mobile station that the coordinated mobile station receives from another mobile station. It is possible to reduce the deterioration of the demodulation accuracy of the data signal from the cooperative mobile station.
  • Signal detection processing to decoding processing using coded bit LLRs of data signals of cooperative mobile stations transmitted by the anchor base station and signal detection to decoding processing using coded bit LLRs calculated by the decoding processing of the own station And may be repeated.
  • transmission of coded bit LLRs is performed a plurality of times in both directions between the cooperative base station and the anchor base station.
  • the coded bit LLR is added to the coded bit LLRs of the data signal of the cooperative mobile station, and the mobile bit other than the cooperative mobile station
  • the coded bit LLRs of the data signal of the station may be used.
  • signal detection and decoding processing using coded bit LLRs of data signals of cooperative mobile stations and signal detection and decoding processing using coded bit LLRs of data signals of mobile stations other than cooperative mobile stations are alternately repeated. It can also be done.
  • the cooperative mobile station when the cooperative mobile station transmits the same data signal to a plurality of base stations, the cooperative mobile station transmits the same data signal based on the reference timing held by the anchor base station among the plurality of transmitted base stations. Send data to multiple base stations.
  • the data transmitted by the cooperative mobile station to the anchor base station when the cooperative base station detects data signals from the plurality of mobile stations including the cooperative mobile station among the plurality of base stations receiving the signal from the cooperative mobile station Use the coded bit LLRs of the signal.
  • the cooperative base station suffers from characteristic degradation due to the collapse of the FFT periodicity and interference between signals in the FFT section (inter-block interference It is possible to reduce the characteristic deterioration due to the
  • the coded bit LLR for the data signal of the coordinated mobile station received by the coordinated base station is transmitted to the anchor base station, and the code for the data signal of the coordinated mobile station received by the coordinated base station at the anchor base station.
  • the coded bit LLR and the coded bit LLR for the data signal of the coordinated mobile station received by the anchor base station are combined, but the encoded bit for the data signal of the coordinated mobile station received by the coordinated base station at the coordinated base station Information data may be acquired by combining the LLR and the coded bit LLR for the data signal of the coordinated mobile station received by the anchor base station.
  • the combined coded bit LLR can be transmitted to the anchor base station.
  • the cooperative base station 300 includes the coded bit LLR storage unit 214 and the combining unit 206 of FIG. 2 as well as the descrambling unit 305 between the depuncturing units 207.
  • the cooperation base station received the signal detection process using the coding bit LLR transmitted from the anchor base station and the signal detection process using the coding bit LLR input from the decoding unit. It is also possible to repeat for the same received signal.
  • the anchor base station has been described as a base station that transmits PDCCH, the base station that performs transmission timing control may be the anchor base station.
  • the anchor base station may be fixed for all mobile stations.
  • cooperative communication may be performed between a plurality of base station apparatuses and at least one mobile terminal apparatus.
  • they may be combined to perform cooperative communication.
  • transmitting apparatuses when these transmitting apparatuses have a plurality of transmitting antenna units (antenna ports), cooperative communication may be performed using a part of the transmitting antennas. Also, among these transmitting devices, communication may be performed with at least one mobile terminal device in coordination among a plurality of antenna ports.
  • the coded bit LLR is used as a data signal of the cooperative mobile station that communicates between the cooperative base station and the anchor base station
  • the present invention is not limited to this.
  • the coded bit LLR may be a signal whose information amount has been reduced using various compression methods such as quantization, or a signal which is hard-decided.
  • the anchor base station when the anchor base station correctly receives the data signal from the coordination base station, the above-described processing can be stopped. In addition, when the coordinated base station correctly receives the data signal from the coordinated mobile station, the anchor base station can be made to stop the processing described above.
  • FIG. 11 is a schematic block diagram showing the configuration of a base station 200 (an anchor base station) in the second embodiment.
  • the base station 200 includes a reception antenna unit 201, a radio unit 202, a signal detection unit 403, a descrambling unit 205, a combining unit 406, a depuncture unit 207, a decoding unit 408, an upper layer 209, a channel estimation unit 210, and coded bit LLRs.
  • a storage unit 414, a transmission antenna unit 211, a wireless unit 212, and a control signal generation unit 213 are provided.
  • the base station 200 of FIG. 11 is different from the base station 200 of FIG. 2 in the configurations of a signal detection unit 403, a combining unit 406, a decoding unit 408, and a decoded bit LLR storage unit 414.
  • the following description will focus on the above different configurations.
  • the signal detection unit 403 is output from the wireless unit 202 using the channel estimation value generated by the channel estimation unit 210 and the detection result of the data signal transmitted from the cooperative base station (base station 300, which will be described later). Signal detection processing on the received signal. Also, the signal detection unit 403 uses the channel estimation value generated by the channel estimation unit 210 and the decoding result of the data signal output from the decoding unit 408 to the received signal output from the wireless unit 202. Perform signal detection processing.
  • the configuration of the signal detection unit 403 is the same as that shown in FIG.
  • the coded bit LLR storage unit 414 stores the detection result (the coded bit LLR after demodulation) of the data signal of the cooperative mobile station transmitted from the cooperative base station.
  • the combining unit 406 combines the demodulated coded bit LLR stored in the coded bit LLR storage unit 414 with the coded bit LLR after demodulation of the data signal of the cooperative mobile station output from the descrambling unit 205. .
  • the decoding unit 408 outputs the calculated coded bit LLRs after decoding to the upper layer, and feeds back the coded bit LLRs after decoding to the signal detection unit 403.
  • FIG. 12 is a schematic block diagram showing the configuration of a base station 300 (coordinated base station) in the second embodiment.
  • the base station 300 includes a reception antenna unit 201, a radio unit 202, a signal detection unit 203, a descrambling unit 305, a depuncture unit 207, a decoding unit 208, an upper layer 509, and a propagation path estimation unit 210.
  • the base station 300 is different from the base station 300 in the first embodiment in that the base station 300 includes a signal detection unit 203 instead of the signal detection unit 303, and includes an upper layer 509 instead of the upper layer 309.
  • the signal detection unit 203 has the configuration shown in FIG.
  • the portions of the base station 300 to which the same reference numerals are attached are the same as the functions shown in the first embodiment.
  • the upper layer 509 obtains the information data of each mobile station from the coded bit LLR after decoding output from the decoding unit 208. Also, the upper layer 509 transmits, to the anchor base station, coded bit LLRs after demodulation of the data signal of the cooperative mobile station output from the descrambling unit 305.
  • the cooperative mobile station (mobile station 100-1) transmits a data signal to the anchor base station and the cooperative base station, and from the data signal transmitted to both of them, the information bit of the cooperative mobile station It is a sequence diagram which shows the operation example which acquires.
  • the anchor base station instructs the coordinated mobile station to transmit a control signal (transmission timing measurement signal, for example, random access preamble in LTE) to measure transmission timing (for example, RACH in LTE)
  • a control signal transmission timing measurement signal, for example, random access preamble in LTE
  • transmission timing for example, RACH in LTE
  • the Preamble Indicator is transmitted (S401).
  • resources for transmitting the transmission timing measurement signal and a format (for example, a preamble sequence) of the transmission timing measurement signal are indicated.
  • the cooperative mobile station transmits a transmission timing measurement signal to the cooperative base station according to the control signal instructing the transmission of the transmission timing measurement signal (S402).
  • the transmission timing measurement signal is transmitted through a random access channel (RACH).
  • the cooperative mobile station can transmit the transmission timing measurement signal regardless of the presence or absence of the control signal instructing transmission of the transmission timing measurement signal.
  • the cooperative base station that has received the transmission timing measurement signal calculates the time difference between the transmission timing measurement signal and the reference timing held by the own base station, creates transmission timing correction information, and sets it (S403).
  • the coordinated base station receives a transmission timing measurement signal from another mobile station (mobile station 100-3 in FIG. 25) that has selected connection with the own base station, it also creates transmission timing correction information for each mobile station.
  • the cooperative base station is a transmission timing at which the time difference between the transmission timing measurement signal from each mobile station and the reference timing held by the cooperative base station becomes GI length or less for all mobile stations connected to the cooperative base station. It will be corrected.
  • maintains it is desirable that it is the same as the reference timing which an anchor base station hold
  • the cooperative base station transmits the transmission timing correction information to the anchor base station through the interface of the upper layer (S404), and the anchor base station transmits the transmitted transmission timing correction information to the cooperative mobile station using the downlink control signal. (S405).
  • the cooperative mobile station transmits uplink resource allocation request (SR: Scheduling Request) to the anchor base station according to the transmission timing notified by the transmission timing correction information (S406).
  • uplink resource allocation requests are made via PUCCH (Physical Uplink Control CHannel).
  • the anchor base station notifies the coordinated mobile station of uplink resource allocation information via PDCCH or the like (S407). At this time, the anchor base station also notifies the cooperative base station of resource allocation information for the cooperative mobile station (S408).
  • the cooperative mobile station transmits data signals to the anchor base station and the cooperative base station based on the resource assignment information (S409 and S410).
  • the resource which transmits a data signal is scheduled so that it may not collide with the other signal of an anchor base station and a cooperation base station by another control signal.
  • the cooperative base station performs detection processing, demodulation processing and the like on the received data signal of the cooperative mobile station, and obtains coded bit LLRs after demodulation. Furthermore, decoding processing and the like are performed on the coded bit LLR after demodulation, and the coded bit LLR after decoding is calculated, and a data signal is detected (S411).
  • the cooperative base station transmits the coded bit LLRs after demodulation for the data signal of the cooperative mobile station to the anchor base station through the interface of the upper layer (for example, X2 interface in LTE) Send. Furthermore, the cooperative base station transmits the coded bit LLRs after decoding for the data signal of the cooperative mobile station among the coded bit LLRs after decoding to the anchor base station through the interface of the upper layer (for example, X2 interface in LTE) (S412).
  • the anchor base station calculates coded bit LLRs after decoding for the data signal of the cooperative mobile station received by the cooperative base station, only transmission of the coded bits after demodulation may be performed in S412.
  • the anchor base station When there is transmission of the coded bit LLR of the cooperative mobile station from the cooperative base station, the anchor base station performs signal detection processing on the data signal received in S409 using the transmitted coded bit LLR after decoding.
  • the coded bit LLRs after decoding of the mobile stations other than the cooperative mobile station are calculated by performing the decoding process (S413).
  • the anchor base station calculates coded bit LLRs after demodulation of the cooperative mobile station by signal detection processing on the data signal received in S409 using coded bit LLRs after decoding of the mobile stations other than the cooperative mobile station. Using the combined signal of the coded bit LLR after demodulation of the cooperative mobile station and the coded bit LLR after demodulation of the cooperative mobile station transmitted from the cooperative base station; Calculate the coded bit LLR of
  • the upper layer acquires information data of each mobile station from the cooperative mobile station calculated as described above and the coded bit LLRs for mobile stations other than the cooperative mobile station (S 414).
  • the information data of each mobile station acquired by the above-mentioned is transmitted to the mobile station of transmission destination of each information data in downlink.
  • FIG. 14 is a flowchart showing an operation example according to reception processing for a data signal received from a mobile station of an anchor base station in the second embodiment.
  • the anchor base station receives data signals from a plurality of mobile stations that have selected to connect to the own base station (step S501).
  • the received data signal also includes the data signal of the cooperative mobile station.
  • step S502 it is determined whether or not there is transmission of coded bit LLRs related to the data signal of the coordinated mobile station received by the own base station from the coordinated base station (step S502). If there is no transmission (step S502; NO), the process waits for transmission. If there is a transmission of coded bit LLRs from the cooperative base station (step S502; YES), using the transmitted coded bit LLRs of the cooperative mobile station, reception of the data signal of the cooperative mobile station received by the anchor base station A signal replica is generated (step S503), and the received signal replica is removed from the received signal of the anchor base station (the signal received in step S501) (step S504).
  • SC-FDMA signal detection, demodulation, descrambling, depuncture, and decoding are performed on the signal from which the received signal replica of the data signal of the cooperative mobile station has been removed in step S504, and decoding of mobile stations other than the cooperative mobile station
  • the subsequent coded bit LLR is calculated (step S505).
  • step S506 information data of the mobile stations other than the cooperative mobile station is acquired from the coded bit LLRs after decoding of the mobile stations other than the cooperative mobile station.
  • the coded bit LLRs after decoding of the mobile stations other than the cooperative mobile station are fed back to the signal detection unit (step S507).
  • the signal detection unit generates a reception signal replica of the data signal received from the mobile station other than the cooperative mobile station, using the fed back coded bit LLR after decoding (step S508).
  • the received signal replica of the data signal received from the mobile station other than the cooperative mobile station is removed from the received signal of the anchor base station (the signal received in step S501) (step S509).
  • SC-FDMA signal detection, demodulation, and descrambling are performed on the signal from which the received signal replica has been removed in step S509, and the anchor base station decodes the data signal received from the coordinated mobile station, and then decodes the encoded bit LLR. Is calculated (step S510).
  • the coded bit LLR after demodulation calculated in step S510 is combined with the coded bit LLR after demodulation for the data signal of the cooperative mobile station transmitted from the cooperative base station (step S511).
  • step S511 depuncturing and decoding are performed on the signal synthesized in step S511, and the code bit LLR after decoding is calculated (step S512). Then, information data is acquired from the coded bit LLR of the data signal of the cooperative mobile station calculated in step S512 (step S513), and the process is completed.
  • the received signal replica from the coordinated mobile station generated from the coded bit LLR of the coordinated mobile station data signal transmitted from the coordinated base station from the received signal of the anchor base station
  • the transmission timing deviation of the cooperative mobile station that the mobile station other than the cooperative mobile station receives from the cooperative mobile station The resulting interference can be reduced, and degradation of the decoding accuracy of data signals from mobile stations other than the cooperative mobile station can be suppressed.
  • the received signal replicas received from mobile stations other than the cooperative mobile station generated from the coded bit LLRs after decoding calculated in the above steps S503
  • signal detection and demodulation processing of the data signal received from the coordinated mobile station is performed to reduce interference due to a shift in transmission timing of the coordinated mobile station that the coordinated mobile station receives from another mobile station. It is possible to reduce the deterioration of the demodulation accuracy of the data signal from the cooperative mobile station.
  • FIG. 15 is a flowchart showing an operation example according to reception processing for a data signal received from the mobile station of the coordinated base station in the second embodiment.
  • step S601 when the cooperative base station receives data signals from a plurality of mobile stations that have selected to connect to the own base station (step S601), SC-CDMA signal detection, demodulation, and descrambling are performed on the received signals. To calculate the coded bit LLR after demodulation (step S602).
  • step S603 it is determined whether the coded bit LLR after demodulation is the coded bit LLR for the data signal of the cooperative mobile station (step S603).
  • the coded bit LLRs of the data signals of mobile stations other than the cooperative mobile station are directly subjected to depuncture and decoding processing to calculate the coded bit LLRs after decoding (step S604).
  • information data of mobile stations other than the cooperative mobile station is acquired from the coded bit LLR after the above-mentioned code (step S605).
  • step S603 in the case of the coded bit LLR of the data signal of the cooperative mobile station (step S603; YES), it is transmitted to the anchor base station through the upper layer interface (step S606). Also, the coded bit LLR of the data signal of the cooperative mobile station is depunctured and decoded, and the coded bit LLR after decoding is calculated (step S 607). The coded bit LLRs after decoding of the cooperative mobile station are transmitted to the anchor base station through the upper layer (step S608).
  • the cooperative mobile station transmits the same data signal to a plurality of base stations
  • the cooperative mobile station transmits the same data signal based on the reference timing held by the cooperative base station among the plurality of transmitted base stations.
  • an anchor base station detects data signals from a plurality of mobile stations including the cooperative mobile station, the data transmitted by the cooperative mobile station to the cooperative base station Use the coded bit LLRs of the signal.
  • the anchor base station suffers from characteristic degradation due to the collapse of the periodicity of the FFT and interference between signals in the FFT section (inter-block interference It is possible to reduce the characteristic deterioration due to the
  • the third embodiment will explain a case where a coordinated mobile station exceeding the GI length and a mobile station not exceeding the GI length coexist in a plurality of base stations receiving data transmitted by the coordinated mobile station.
  • FIG. 16 is a diagram showing the entire system of the third embodiment.
  • the mobile station 100-2 is connected to only the base station 200
  • the mobile station 100-3 is connected to only the base station 300
  • the mobile station 100-4 is connected to only the base station 400.
  • the anchor base station (base station 200) and two cooperative base stations (base station 300, base station 400) are transmitted at transmission timing based on the reference timing that the cooperative mobile station (mobile station 100-1) holds. ) And the base station 300 and the base station 400 receive the data signal of the cooperative mobile station at the reception timing exceeding the GI length, the data signals transmitted to all the base stations are transmitted to the cooperative mobile station.
  • each coordinated base station determines whether the reception timing from the coordinated mobile station exceeds the GI length.
  • the anchor base station instructs the coordinated mobile station to transmit a control signal (transmission timing measurement signal, for example, random access preamble in LTE) to measure transmission timing (for example, RACH in LTE) Transmit the Preamble Indicator) (S700).
  • a control signal transmission timing measurement signal, for example, random access preamble in LTE
  • transmission timing for example, RACH in LTE
  • Transmit the Preamble Indicator S700.
  • resources for transmitting the transmission timing measurement signal and a format (for example, a preamble sequence) of the transmission timing measurement signal are indicated.
  • the cooperative mobile station transmits the transmission timing measurement signal to the anchor base station and the cooperative base station (base station 300 and base station 400) through the RACH according to the control signal instructing the transmission of the transmission timing measurement signal (S701, S702 and S703).
  • the cooperative mobile station can transmit the transmission timing measurement signal regardless of the presence or absence of the control signal instructing transmission of the transmission timing measurement signal. In that case, since the available resources and formats are broadcasted from the anchor base station through the PBCH, the transmission timing measurement signal can be transmitted based thereon.
  • the anchor base station having received the transmission timing measurement signal calculates a time difference (transmission timing correction value) between the transmission timing measurement signal and the reference timing held by the own base station, and generates transmission timing correction information.
  • the anchor base station receives a transmission timing measurement signal from another mobile station (mobile station 100-2 in FIG. 16) that has selected connection with its own base station, it also creates transmission timing correction information for each mobile station ( S704).
  • the anchor base station is a transmission timing at which the time difference between the transmission timing measurement signal from each mobile station and the reference timing held by the anchor base station is less than or equal to the GI length for all mobile stations connected as the anchor base station. It will be corrected.
  • the reference timing held by the anchor base station is preferably the same as the reference timing held by the cooperative base station.
  • the anchor base station notifies the coordinated mobile station of the transmission timing correction information by the downlink control signal (S705).
  • the cooperative mobile station transmits uplink resource allocation request (SR: Scheduling Request) to the anchor base station according to the transmission timing notified by the transmission timing correction information (S706).
  • uplink resource allocation requests are made via PUCCH (Physical Uplink Control CHannel).
  • the anchor base station reports uplink resource allocation information to the coordinated mobile station via PDCCH or the like (S 707). At this time, the anchor base station also notifies the cooperative base station of resource allocation information for the cooperative mobile station (S 708 and S 709).
  • the base station 300 performs cooperative movement using the transmission timing calculated from the resource allocation information for the cooperative mobile station transmitted in S708 and the transmission timing correction value measured using the transmission timing measurement signal received in S703. It is determined whether or not the reception timing of the data signal received from the station exceeds the GI length, and if it exceeds the GI length, the anchor base station is requested to transmit the detection result of the data signal of the cooperative mobile station (S710).
  • the transmission request for the detection result of the data signal can be made to another coordinated base station.
  • the reception timing exceeds the GI length using the transmission timing correction value measured using the resource allocation information for the cooperative mobile station transmitted in S709 and the transmission timing measurement signal received in S703. If it exceeds the GI length, the anchor base station is requested to transmit the detection result of the data signal (S711).
  • the cooperative mobile station transmits data signals to the anchor base station and the cooperative base station based on the resource assignment information (S712, 713 and S714).
  • the resource which transmits a data signal is scheduled so that it may not collide with the other signal of an anchor base station and a cooperation base station by another control signal.
  • the anchor base station performs detection processing on the received data signal of the coordinated mobile station to obtain coded bit LLRs after decoding.
  • the anchor base station transmits the decoded coded bit LLR to the base stations 300 and 400 through the upper layer interface (for example, the X2 interface in LTE) as a detection result of the data signal (S 715 and S 716) .
  • the upper layer interface for example, the X2 interface in LTE
  • the base station 300 performs signal detection processing S717 (S718) of the data signal received in S713 (S714) using the coded bit LLR after decoding transmitted in S715 (S716). Do.
  • the base station 300 (base station 400) transmits the coded bit LLR after demodulation of the data signal of the cooperative mobile station among the data signals obtained by the signal detection process to the anchor base station through the interface of the upper layer (S719 and S720).
  • the coded bit LLRs after demodulation of data signals of other mobile stations (for example, mobile station 100-3 and mobile station 100-4 in FIG. 16) obtained by the signal detection processing are determined in the upper layer after decoding processing Get information data.
  • the anchor base station is the coded bit LLR after demodulation of the data signal from the coordinated mobile station received by the anchor base station and the coordinated mobile station transmitted from the coordinated base station (base station 300 and base station 400).
  • decoding the data bit by combining the coded bit LLR after demodulation of the data signal (the combining unit 206 in FIG. 2) and performing the decoding process (decoding unit 208 in FIG. 2) on the combined coded bit LLR
  • decoding unit 208 in FIG. 2 calculate the coded bit LLR of
  • the anchor base station acquires the information data of the cooperative mobile station from the coded bit LLR after the decoding in the upper layer (S721).
  • the information data of each mobile station acquired by the above-mentioned is transmitted to the mobile station of transmission destination of each information data in downlink.
  • coded bit LLRs after decoding or coded bits may be used instead of the coded bit LLRs after demodulation transmitted between the respective base stations.
  • the anchor base station (base station 200) and the two coordinated base stations (base station 300, base station 400) are transmitted at transmission timing based on the reference timing held by the coordinated mobile station (mobile station 100-1). ),
  • the base station 300 receives the data signal of the cooperative mobile station at the reception timing exceeding the GI length
  • the base station 400 receives the data signal of the cooperative mobile station at the reception timing within the GI length.
  • the anchor base station transmits a control signal for instructing the cooperative mobile station to transmit a control signal (transmission timing measurement signal; for example, random access preamble in LTE) to measure transmission timing (S800).
  • a control signal transmission timing measurement signal; for example, random access preamble in LTE
  • transmission timing measurement signal for example, random access preamble in LTE
  • the resource for transmitting the transmission timing measurement signal and the format of the transmission timing measurement signal are indicated.
  • the cooperative mobile station transmits a transmission timing measurement signal to the anchor base station and the cooperative base station (base station 300 and base station 400) according to the control signal instructing transmission of the transmission timing measurement signal (S801, S802 and S802). S803).
  • the transmission timing measurement signal is transmitted via the RACH.
  • the cooperative mobile station can transmit the transmission timing measurement signal regardless of the presence or absence of the control signal instructing transmission of the transmission timing measurement signal. In that case, since the available resources and formats are broadcasted from the anchor base station through the PBCH or the like, the transmission timing measurement signal can be transmitted based thereon.
  • the anchor base station having received the transmission timing measurement signal calculates a time difference (transmission timing correction value) between the transmission timing measurement signal and the reference timing held by the own base station, and generates transmission timing correction information (S804) .
  • the anchor base station receives a transmission timing measurement signal from another mobile station (mobile station 100-2 in FIG. 16) that has selected connection with the base station, the anchor base station also creates transmission timing correction information for each mobile station.
  • the anchor base station corrects the transmission timing to make the time difference between the transmission timing measurement signal from each mobile station and the reference timing held by the anchor base station equal to or less than the GI length for all mobile stations connected as the anchor base station. Will do.
  • the reference timing held by the anchor base station is preferably the same as the reference timing held by the cooperative base station.
  • the anchor base station notifies the coordinated mobile station of the transmission timing correction information by the downlink control signal (S805).
  • the cooperative mobile station requests uplink resource allocation to the anchor base station according to the transmission timing notified by the transmission timing correction information (S806).
  • the uplink resource allocation request is made through PUCCH.
  • the anchor base station notifies the coordinated mobile station of uplink resource allocation information via PDCCH or the like (S807).
  • the anchor base station also notifies the cooperative base station of resource allocation information for the cooperative mobile station (S808, S809).
  • the base station 300 uses the transmission timing calculated from the resource allocation information for the cooperative mobile station transmitted in S808 and the transmission timing correction value measured using the transmission timing measurement signal received in S802 to perform the cooperative mobile station. It is determined whether the reception timing of the data signal received from the device exceeds the GI length, and if it exceeds the GI length, the anchor base station and the coordinated base station are requested to transmit the detection result of the data signal (S810, S811 ).
  • the transmission request for the detection result of the data signal to the coordination base station may not take into consideration whether the coordinated mobile station exceeds the GI length.
  • the base station 400 uses the transmission timing calculated from the resource allocation information for the cooperative mobile station transmitted in S809 and the transmission timing correction value measured using the transmission timing measurement signal received in S803, Since it does not exceed the GI length, it is judged whether the reception timing of the data signal to be received from the G channel exceeds the GI length, so the anchor base station and the coordinated base station are not requested to transmit the detection result of the data signal.
  • the cooperative mobile station transmits data signals to the anchor base station and the cooperative base station based on the resource assignment information (S812, 813 and S814).
  • the resource which transmits a data signal is scheduled so that it may not collide with the other signal of an anchor base station and a cooperation base station by another control signal.
  • the anchor base station and base station 400 perform detection processing on the received data signal of the coordinated mobile station (S 815 and S 816), and obtain coded bit LLRs after decoding.
  • the base station 400 transmits the coded bit LLRs after demodulation of the data signal of the cooperative mobile station to the anchor base station through the interface of the upper layer (for example, the X2 interface in LTE) (S819).
  • the coordinated base station (base station 400) that receives the data signal of the coordinated mobile station at a timing not exceeding the anchor base station and the GI length transmits the coded bit LLRs after decoding to the base station 300 via the interface of the upper layer. (S817 and S818).
  • the base station 300 performs signal detection processing of the data signal received in S813, using the encoded bit LLRs after decoding transmitted in S817 and S818 (S820).
  • the base station 300 transmits the coded bit LLR after demodulation of the data signal of the cooperative mobile station among the data signals obtained by the signal detection process to the anchor base station through the interface of the upper layer (S 821).
  • the coded bit LLRs of the data signal of the other mobile station (for example, the mobile station 100-3 in FIG. 16) obtained by the signal detection process are determined in the upper layer to obtain information data (S822).
  • the anchor base station is the coded bit LLR after demodulation of the data signal from the coordinated mobile station received by the anchor base station and the coordinated mobile station transmitted from the coordinated base station (base station 300 and base station 400).
  • decoding the data bit by combining the coded bit LLR after demodulation of the data signal (the combining unit 206 in FIG. 2) and performing the decoding process (decoding unit 208 in FIG. 2) on the combined coded bit LLR
  • decoding unit 208 in FIG. 2 calculateate the coded bit LLR of
  • the anchor base station acquires the information data of the cooperative mobile station from the coded bit LLR after the decoding in the upper layer (S822).
  • the information data of each mobile station acquired by the above-mentioned is transmitted to the mobile station of transmission destination of each information data in downlink.
  • the determination as to whether or not reception occurs at a timing exceeding the GI length is made by using the transmission timing calculated from the resource allocation information for the coordinated mobile station and the transmission timing correction value measured using the transmission timing measurement signal.
  • the anchor base station, the cooperative base station, and the cooperative mobile station exchange their respective position information acquired from the GPS (Global Positioning System) etc., and each mobile station receives from the cooperative mobile station calculated based on the position information It can also be judged by the timing deviation. As shown in FIGS.
  • the cooperative base station determines whether or not the data signal from the cooperative mobile station will be received at the timing when it exceeds the GI length, and if it exceeds the GI length, the GI length Using the coded bit LLRs after decoding of the other base station that has received the data signal from the cooperative mobile station at a reception timing that does not exceed, the data signal of the cooperative mobile station is detected.
  • the configuration of the coordinated mobile station in the third embodiment is the same as that of the mobile station 100 of FIG. 1 according to the first embodiment.
  • the configuration of the anchor base station in the third embodiment is similar to that of the anchor base station 200 of FIG. 2 according to the first embodiment.
  • FIG. 19 is a schematic block diagram showing the configuration of a coordinated base station (base station 300, base station 400) in the third embodiment.
  • the cooperative base station includes a receiving antenna unit 201, a radio unit 202, a signal detection unit 603, a descrambling unit 305, a depuncture unit 207, a decoding unit 208, an upper layer 609, a propagation path estimation unit 210, and a control unit 601. ing.
  • the cooperative base station according to the present embodiment includes a signal detection unit 603 instead of the signal detection unit 303, includes an upper layer 609 instead of the upper layer 309, and further includes a control unit 601 according to the first embodiment.
  • the base station 300 is different from the base station 300 in FIG.
  • the portions of the base station 300 to which the same reference numerals are attached are the same as the functions shown in the first embodiment, and hereinafter, different portions will be mainly described.
  • the upper layer 609 acquires information data of the mobile station addressed to the own station from the coded bit LLR after decoding output from the decoding unit 208. Also, the control unit 601 is notified of the transmission timing measurement signal transmitted from the coordinated mobile station and uplink resource allocation information transmitted from the anchor base station.
  • the upper layer 609 transmits the coded bit LLRs after decoding of the cooperative mobile station output from the decoding unit 208 to the anchor base station or / and the cooperative base station. Also, the upper layer 609 transmits, to the anchor base station, the coded bit LLRs after demodulation of the data signal of the cooperative mobile station output from the descrambling unit 305.
  • the control unit 601 measures the timing deviation (transmission timing correction value for the own station) between the reception timing of the data signal of the cooperative mobile station and the reference timing of the own station using the transmission timing measurement signal. Also, the transmission timing (actual transmission timing) of the cooperative mobile station transmitted at the transmission timing of the anchor base station is obtained from the resource allocation information on the uplink. Then, based on the timing difference and the time difference between the actual transmission timing, it is determined whether or not the coordinated mobile station is to receive at a timing that exceeds the GI length, and the determination result is notified to the signal detection unit 603.
  • the signal detection unit 603 has the same configuration as that of 303 in FIG. 5, but the interference removal unit 332 subtracts the received signal replica generated by the replica generation unit 331 based on the determination result notified from the control unit 601. Is different from the signal detection unit 303. That is, when there is a notification from the control unit 601 that the cooperative mobile station will receive data at a timing exceeding the GI length, the interference removing unit 332 subtracts the received signal replica.
  • the anchor base station receives data signals from a plurality of mobile stations that have selected to connect to the own base station (step S901).
  • the received data signal also includes the data signal of the cooperative mobile station.
  • the anchor base station performs SC-FDMA signal detection, demodulation, and descrambling processing on the received data signal, and calculates coded bit LLRs after demodulation (step S 902).
  • the coded bit LLRs of the data signals of the mobile stations other than the cooperative mobile station are depunctured and decoded, and the coded bit LLRs after decoding are processed. Are calculated (step S904), and information data of each mobile station is acquired from the coded bit LLR after the decoding (step S905).
  • the coded bit LLRs of the data signal of the cooperative mobile station (step S903; YES) store the coded bit LLRs after demodulation of the data signal of the cooperative mobile station in the storage unit. Further, depuncture and decoding processing is performed on the demodulated coded bit LLR (step S 906).
  • step S 907 when there is a request for transmission of the coded bit LLRs after decoding of the cooperative mobile station from another base station (step S 907; YES), the coded bits after decoding of the data signal of the cooperative mobile station calculated in step S 906 The LLR is transmitted to the coordination base station (step S 908). If there is no request for transmission (step S 907; NO), the cooperative base station waits for transmission of the coded bit LLR after demodulation of the data signal of the cooperative mobile station.
  • the anchor base station checks whether or not there is transmission of the coded bit LLR of the data signal of the cooperative mobile station received by the cooperative base station from the cooperative base station (step S909). If there is no transmission (step S 909; NO), the transmission waits. If there is transmission (step S 909; YES), the coded bit LLR after demodulation of the data signal of the coordinated mobile station received by the coordinated base station transmitted and the data signal of the coordinated mobile station received by the anchor base station The coded bit LLR after demodulation (the coded bit LLR stored in the coded bit LLR storage unit) is synthesized (step S 910).
  • step S904 depuncture and decoding processing is performed on the coded bit LLRs of the data signal of the cooperative mobile station that has been synthesized, and the coded bit LLRs after decoding of the cooperative mobile station are calculated (step S904). Finally, the coded bit LLRs after decoding of the cooperative mobile station are hard-decided to obtain information data of the cooperative mobile station (step S905).
  • FIGS. 21 and 22 are flowcharts showing an operation example related to the reception process for the data signal received from the mobile station in the cooperative base station in the third embodiment.
  • the cooperative base station receives data signals from a plurality of mobile stations that have selected to connect with the own base station (step S1001 in FIG. 21).
  • the received data signal also includes the data signal of the cooperative mobile station.
  • the cooperative base station receives the data signal of the cooperative mobile station from the transmission timing measurement signal transmitted from the cooperative mobile station and the resource allocation information of uplink of the cooperative mobile station transmitted from the anchor base station It is determined whether or not the timing to perform the timing exceeds the GI length (step S1002).
  • step S1002 If the reception timing of the data signal of the cooperative mobile station does not exceed the GI length (step S1002: NO), SC-FDMA signal detection, demodulation and descrambling are performed on the data signal received in step S1001, and after demodulation
  • the encoded bit LLR of L is calculated (step S1003), and the encoded bit associated with the data signal of the cooperative mobile station among the calculated encoded bit LLRs is transmitted to the anchor base station (step S1004).
  • step S1005 descrambling, depuncture, and decoding are performed on the demodulated coded bit LLR calculated in step S1003, and the coded bit after decoding is calculated (step S1005).
  • the calculated coding bit is calculated in step S1005 in the mobile station of the request source when another mobile station requests transmission of the coded bit LLR of the data signal of the cooperative mobile station (step S1006; YES).
  • the coded bit LLRs after decoding for the data signal of the cooperative mobile station are transmitted (step S1007).
  • information data of each mobile station other than the cooperative mobile station is acquired from the coded bit LLR after the decoding (step S1008).
  • step S1006 when there is no request for transmission of coded bit LLRs (step S1006; No)
  • step S1008 when there is no request for transmission of coded bit LLRs
  • step S1002 when the reception timing of the data signal of the cooperative mobile station exceeds the GI length (step S1002: YES), another base station is requested to transmit the coded bit LLR after decoding (step S1009 in FIG. 22), transmission It waits for being done (step S1010).
  • a base station requesting transmission can be requested regardless of the anchor base station and the coordinating base station.
  • step S1010 when the coordinated base station transmits the coded bit LLR for the data signal of the coordinated mobile station from another base station (step S1010; YES), the coordinated base station uses the transmitted coded bit LLR.
  • a received signal replica of the data signal of the cooperative mobile station received is generated (step S1011), and the received signal replica is removed from the received signal of the cooperative base station (the signal received in step S1001) (step S1012).
  • step S1012 SC-FDMA signal detection, demodulation, descrambling, depuncture, and decoding processing are performed on the signal from which the received signal replica of the data signal of the cooperative mobile station is removed in step S1012, and the coded bit LLR after decoding of the mobile station is performed. Is calculated (step S1013).
  • the upper layer acquires information data by making a hard decision on the coded bit LLR after the decoding (step S1014). Also, if there is a request from the other base station to the cooperative mobile station to transmit the coded bit LLR after decoding to the cooperative base station, the coded bit LLR after decoding for the data signal of the cooperative mobile station calculated in step S1013 Can be sent.
  • the coded bit LLRs after decoding for the data signals of mobile stations other than the cooperative mobile station calculated in step S1013 are fed back to the signal detection unit (step S1015).
  • the signal detection unit generates a reception signal replica of the data signal received from the mobile station other than the cooperative mobile station, using the fed back coded bit LLR after decoding (step S1016).
  • the received signal replica generated in step S1016 is removed from the received signal of the cooperative base station (the signal received in step S1001) (step S1017). Then, SC-FDMA signal detection, demodulation, and descrambling are performed on the signal from which the received signal replica has been removed in step S1017, and the coded bit LLR after demodulation of the data signal received from the coordinated mobile station by the coordinated base station Is calculated (step S1018). The coded bit LLRs after demodulation calculated in step S1018 are transmitted to the anchor base station (step S1019), and the process is completed.
  • the coded bit LLR after demodulation for the data signal of the cooperative mobile station calculated in step S1019
  • decoding processing can be performed to transmit the coded bit LLRs after the decoding.
  • FIG. 17 and FIG. 18 explain the case where each coordinated base station determines whether the reception timing from the coordinated mobile station exceeds the GI length, an anchor base station can also perform this.
  • FIG. 23 shows an anchor base station (base station 200) and two cooperative base stations (base station 300, base station) at a transmission timing based on the reference timing held by the coordinated mobile station (mobile station 100-1).
  • base station 300 and the base station 400 receive the data signal of the cooperative mobile station at the reception timing exceeding the GI length, the data signal of the cooperative mobile station received by the base station is It is a sequence diagram in case an anchor base station determines whether it exceeds GI length.
  • the anchor base station (base station 200) transmits a control signal instructing the coordinated mobile station to transmit a control signal (transmission timing measurement signal) for measuring transmission timing (step S751).
  • a control signal transmission timing measurement signal
  • the resource for transmitting the transmission timing measurement signal and the format of the transmission timing measurement signal are indicated.
  • the cooperative mobile station transmits a transmission timing measurement signal to the anchor base station and the cooperative base station (base station 300 and base station 400) in accordance with the control signal instructing transmission of the transmission timing measurement signal (steps S752 and S753). And S754).
  • the transmission timing measurement signal is transmitted through the RACH.
  • the cooperative base station receiving the transmission timing measurement signal calculates a time difference (transmission timing correction value) between the transmission timing measurement signal and the reference timing held by the own base station (steps S755 and S756), and anchors through the upper layer. It transmits to a base station (S757 and S758).
  • the anchor base station that has received the transmission timing measurement signal calculates the time difference between the transmission timing measurement signal and the reference timing held by the own base station, and creates transmission timing correction information (step S759).
  • the anchor base station is a transmission timing at which the time difference between the transmission timing measurement signal from each mobile station and the reference timing held by the anchor base station is less than or equal to the GI length for all mobile stations connected as the anchor base station. It will be corrected.
  • the anchor base station receives the data timing of the coordinated mobile station received by each coordinated base station from the transmission timing correction information and the time difference between the reference timing transmitted from the coordinated base station (transmission timing correction value) Determines whether it exceeds the GI length, and creates timing error information.
  • the timing error information may be information describing whether the reception timing exceeds the GI length or may be information indicating a timing error.
  • the anchor base station notifies the coordinated mobile station of the transmission timing correction information by the downlink control signal (step S760). Then, the cooperative mobile station transmits uplink resource allocation request (SR: Scheduling Request) to the anchor base station according to the transmission timing notified by the transmission timing correction information (step S 761). For example, the uplink resource allocation request is made through PUCCH.
  • SR Scheduling Request
  • the anchor base station notifies the coordinated mobile station of uplink resource allocation information via PDCCH or the like (step S762). Furthermore, the anchor base station notifies the cooperative base station of the resource allocation information and the timing error information for the cooperative mobile station through the upper layer (steps S763 and S764).
  • the cooperative mobile station transmits data signals to the anchor base station and the cooperative base station based on the resource assignment information (steps S765, 766 and S767).
  • the resource which transmits a data signal is scheduled so that it may not collide with the other signal of an anchor base station and a cooperation base station by another control signal.
  • the anchor base station performs detection processing on the received data signal of the coordinated mobile station (step S768), and obtains coded bit LLRs after decoding.
  • the anchor base station transmits the decoded coded bit LLR to the base stations 300 and 400 through the interface of the upper layer (steps S769 and S770).
  • base station 300 performs signal detection processing of the data signal received in step S763 (S764) using the coded bit LLRs after decoding transmitted in step S769 (S770) (step S763). Steps 771, S772).
  • the base station 300 (base station 400) transmits the coded bit LLR after demodulation of the data signal of the cooperative mobile station among the data signals obtained by the signal detection process to the anchor base station through the interface of the upper layer (step S773). And S774).
  • the coded bit LLRs after decoding of data signals of other mobile stations (for example, mobile station 100-3 and mobile station 100-4 in FIG. 16) obtained by the signal detection process are determined in the upper layer and the information data is obtain.
  • the anchor base station is the coded bit LLR after demodulation of the data signal from the coordinated mobile station received by the anchor base station and the coordinated mobile station transmitted from the coordinated base station (base station 300 and base station 400).
  • the coded bit LLR after demodulation of the data signal is combined, and the combined coded bit LLR is decoded to calculate the coded bit LLR after decoding of the data signal of the cooperative mobile station.
  • the anchor base station acquires information data of the cooperative mobile station from the coded bit LLR after the decoding in the upper layer (step S775).
  • the information data of each mobile station acquired by the above-mentioned is transmitted to the mobile station of transmission destination of each information data in downlink.
  • coded bit LLRs after decoding or coded bits may be used instead of the coded bit LLRs after demodulation transmitted between the respective base stations.
  • the anchor base station reports timing error information together with resource allocation information (steps S763 and S764), but the present invention is not limited to this as long as notification is possible. For example, it may be notified along with the transmission of the detection result of the data signal (steps S769 and S770).
  • FIG. 23 shows the case where the cooperative base station that receives at the timing when the data signal from the cooperative mobile station shown in FIG. 18 exceeds the GI length and the cooperative base station that receives at timing that does not exceed the GI length coexist. It can be applied to
  • the anchor base station 200 in FIG. 2 includes the control unit 601 in FIG. Become. That is, using the transmission timing correction value of the cooperation base station transmitted through the upper layer and the transmission timing correction value calculated by the anchor base station itself, the control unit 601 provided in the anchor base station performs each cooperation base station Control information (timing error information) indicating whether the received data signal of the cooperative mobile station exceeds the GI length is input to the control signal generation unit 213.
  • a base station to perform cooperative communication may be selected based on the timing shift of the cooperative mobile station with respect to each base station. For example, by applying the present invention, it is possible to select a base station whose characteristics can be improved, perform cooperative communication, and select not to perform cooperative communication with other base stations. Also, the transmission power of the coordinated mobile station may be controlled accordingly.
  • the cooperative mobile station can transmit at different timings other than the method of transmitting the transmission timing measurement signal simultaneously to the anchor base station and the cooperative base station.
  • the anchor base station notify the cooperative base station of the resource and format of the transmission timing measurement signal transmitted by the cooperative mobile station in advance.
  • the resources and format of the transmission timing measurement signal may be different.
  • the transmission timing measurement signal may be transmitted to each coordinated base station at the same time or at different timings.
  • the cooperative mobile station can also be implemented by transmitting position information acquired from a GPS (Global Positioning System) or a reference signal for position measurement transmitted by each base station to the anchor base station.
  • the cooperative mobile station can also be realized by measuring the difference in reception timing in the cooperative mobile station from the synchronization signal or the like transmitted from each base station and transmitting the information to the anchor base station.
  • the GI length is exceeded.
  • the cooperative base station requests the base station (including the anchor base station) not exceeding the GI length to decode the data signal of the cooperative mobile station, and the base station receives it using the decoding result transmitted by the request. It performs signal detection processing and demodulation processing of data signals.
  • a cooperative base station exceeding the GI length is a coded bit LLR after decoding calculated by another cooperative base station exceeding the GI length, and the decoding calculated by signal detection using the decoding result of the other base station
  • the demodulation processing of the data signal received by the own base station can also be performed using the modulation bit LLR.
  • the cooperative mobile station exceeding the GI length can perform signal detection processing using the accurate decoding result of the data signal among the data signals transmitted to the base stations by the cooperative mobile station, the period of the FFT can be obtained.
  • the influence of interference due to the collapse of the sex and interference between signals in the FFT section is small, and highly accurate detection is possible.
  • inter-block interference is small, and highly accurate detection is possible.
  • the transmission timing of the cooperative mobile station is set according to the reference timing of the anchor base station.
  • the transmission timing of the cooperative mobile station may be set according to the reference timing of the cooperative mobile station shown in the second embodiment.
  • the first to third embodiments will be described using SC-FDMA transmission, but the present invention is not limited to this.
  • the present invention can also be applied to a transmission scheme that adds a Guard Interval (GI) such as OFDM, Orthogonal Frequency Division Multiple Access (OFDMA), and Multi Carrier-Code Division Multiple Access (MC-CDMA).
  • GI Guard Interval
  • OFDM Orthogonal Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • MC-CDMA Multi Carrier-Code Division Multiple Access
  • the base station that performs signal detection only with the data signal received by the own station is the own station using the detection results of the data signals of the first base station and the other base stations.
  • a base station that performs signal detection of the received data signal is a second base station. That is, in the first embodiment, the anchor base station (the base station 200 in the first embodiment) is the first base station, and the coordinated base station (the base station 300 in the first embodiment) is the second base station. In the second embodiment, the anchor base station (the base station 200 of the second embodiment) is the second base station, and the coordinated base station (the base station 300 of the second embodiment) is the first base station. In the third embodiment, the anchor base station (the base station 200 in the third embodiment) is the first base station, and the coordinated base station (the base stations 300 and 400 in the third embodiment) is the third. It corresponds to 2 base stations.

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