WO2012140847A1 - Appareil de transmission, appareil de réception, procédé de génération de signal et procédé d'estimation de qualité - Google Patents

Appareil de transmission, appareil de réception, procédé de génération de signal et procédé d'estimation de qualité Download PDF

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Publication number
WO2012140847A1
WO2012140847A1 PCT/JP2012/002302 JP2012002302W WO2012140847A1 WO 2012140847 A1 WO2012140847 A1 WO 2012140847A1 JP 2012002302 W JP2012002302 W JP 2012002302W WO 2012140847 A1 WO2012140847 A1 WO 2012140847A1
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sequence
orthogonal sequence
cluster
cyclic shift
antenna port
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PCT/JP2012/002302
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English (en)
Japanese (ja)
Inventor
岩井　敬
西尾　昭彦
佳彦 小川
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パナソニック株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04L5/0026—Division using four or more dimensions
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the present invention relates to a transmission device, a reception device, a signal generation method, and a quality estimation method that perform discontinuous band allocation.
  • LTE-Advanced uplink which is an extension of 3GPP LTE (3rd Generation Partnership Project Project Long Term Evolution)
  • two technologies are being studied to improve scheduling gain through flexible frequency resource allocation.
  • Transmission and MU-MIMO Multiple User -Multiple Input Multiple Output.
  • discontinuous band transmission In LTE, in order to reduce CM (Cubic Metric) and PAPR (Peak to Average Power Ratio), only continuous band transmission that allocates data signals of each terminal to continuous frequency bands is used.
  • CM Cubic Metric
  • PAPR Peak to Average Power Ratio
  • non-continuous band transmission in addition to continuous band transmission (for example, see Non-Patent Document 1).
  • the maximum number of clusters (lumps of continuous bands) in discontinuous band transmission is 2.
  • Discontinuous band transmission is a method in which data signals and reference signals are allocated and transmitted in discontinuous frequency bands distributed over a wide band.
  • a data signal and a reference signal are allocated to continuous frequency bands.
  • the data signal and the reference signal can be assigned to discrete frequency bands (here, two clusters). Therefore, in the non-continuous band transmission, the degree of freedom of frequency resource allocation of the data signal and reference signal of each terminal is improved with respect to the continuous band transmission, so that a larger frequency scheduling gain can be obtained.
  • the number of clusters at the time of non-continuous band transmission is two will be described as an example assuming LTE-Advanced.
  • MU-MIMO is a technique in which a plurality of terminals perform MIMO communication with a base station, and can improve the frequency utilization efficiency of the system and improve the system throughput performance.
  • transmission side transmission side
  • base station reception side
  • DM-RS DeModulation-Reference Signal
  • MIMO is a technique that includes a plurality of antennas on the transmission side and the reception side, respectively, and enables simultaneous spatial multiplexing transmission of different signal sequences at the same frequency.
  • a cyclic shift (CS) sequence that is an orthogonal sequence is used as the DM-RS.
  • the cyclic shift sequence is generated, for example, by cyclically shifting a ZC (Zadoff-Chu) sequence that is a code sequence by a cyclic shift amount (CS amount) in the time domain.
  • the cyclic shift sequence of ⁇ 6 shown in FIG.
  • the cyclic shift amount ( ⁇ ) is determined by the base station and notified from the base station to the terminal using the downlink channel.
  • the downlink channel is, for example, PDCCH (Physical Downlink Control Channel: PDCCH).
  • a cyclic shift sequence having the same transmission band is a complete orthogonal sequence, and no inter-sequence interference occurs.
  • perfect orthogonality cannot be maintained, and some inter-sequence interference occurs.
  • cyclic shift sequences with different transmission bands are not orthogonal sequences, and large inter-sequence interference occurs.
  • LTE-Advanced it has been agreed to use an OCC (Orthogonal Cover Code) sequence in addition to the cyclic shift sequence adopted by LTE as DM-RS (for example, see Non-Patent Document 2).
  • OCC Orthogonal Cover Code
  • DM-RS Downlink Reference Signal
  • FIG. 3 shows an application example of the OCC series.
  • one subframe for example, 1 msec
  • slot # 1 and slot # 2 is composed of two slots (slot # 1 and slot # 2), and each slot has seven symbols (here, LB (LongLBlock) and CP). (Cyclic Prefix)).
  • LB LongLBlock
  • CP Cyclic Prefix
  • DM-RS is transmitted using the center symbol (LB # 4) of each slot of one subframe.
  • OCC # 1 [ 1 [1]
  • the sequence length of the OCC sequence is two that can be realized by the subframe configuration in LTE-Advanced.
  • the number of OCC sequences that can be generated is two (OCC # 1 and OCC # 2).
  • the OCC sequence number used by the terminal for generating the DM-RS is uniquely associated with the cyclic shift amount information included in the control information notified in the downlink channel and notified from the base station to the terminal. (See, for example, Non-Patent Document 2).
  • FIG. 4 is a table showing a correspondence relationship between the cyclic shift amount information used in LTE-Advanced and the OCC sequence.
  • the table shown in FIG. 4 may be referred to as a “used sequence identification table” for the terminal to identify the OCC sequence number based on the cyclic shift amount information.
  • Cyclic Shift Field indicates cyclic shift amount information
  • CS value indicates a cyclic shift amount (unit: [symbol length / 12 (ms)])
  • OCC indicates an OCC sequence.
  • ⁇ represents an antenna port number of the terminal. Note that, in the LTE-Advanced uplink, SU-MIMO (Single-User-Multiple-Input-Multiple-Output) in which one terminal transmits data signals from a plurality of antenna ports at the same time and the same frequency and spatially multiplexes the data signals is used. Supported.
  • the transmission bandwidths of a plurality of streams (transmission signals transmitted from each antenna port) transmitted by one terminal are the same. Therefore, in SU-MIMO, the orthogonality of DM-RS in each stream can be maintained by making the cyclic shift amounts of DM-RS transmitted in each stream different from each other.
  • the base station can notify each terminal of the transmission bandwidth. Therefore, when the transmission bandwidth differs between terminals performing MU-MIMO, as described above, orthogonality in DM-RS cannot be maintained even if the cyclic shift amount of the terminal is varied. For this reason, it is necessary to make the DM-RS orthogonal by changing the OCC sequence number between terminals performing MU-MIMO.
  • the use sequence identification table shown in FIG. 4 is used for both continuous band transmission and non-continuous band transmission. That is, at the time of non-continuous band transmission, the OCC sequence number used for the DM-RS of each cluster transmitted from the terminal is the same.
  • 3GPP TR36.212 v10.0.0 (2010-12), "3GPP TSG RAN E-UTRA Multiplexing and channel coding (Release 10)" 3GPP TR36.211 v10.0.0 (2010-12), “3GPP TSG RAN E-UTRA Physical channels and modulation (Release 10)”
  • the OCC sequence numbers used for DM-RSs in each cluster transmitted by one terminal during non-continuous band transmission are the same, and MU-MIMO can be performed without DM-RSs being orthogonal between terminals. Bands that disappear can occur.
  • each terminal performs discontinuous band transmission using two clusters. Also, in FIG. 5, each terminal determines an OCC sequence used for DM-RS in each cluster (that is, the same OCC sequence in all clusters), for example, according to the use sequence identification table shown in FIG. For example, in FIG. 5, terminal # 1 uses OCC # 2, terminal # 2 uses OCC # 1, and terminal # 3 uses OCC # 1.
  • the frequency bands of the cluster # 1 of the terminal # 1 and the cluster # 1 of the terminal # 2 partially overlap.
  • DM-RSs are orthogonal. The same applies to the cluster # 2 of the terminal # 1 and the cluster # 1 of the terminal # 3 shown in FIG.
  • the cluster # 2 of the terminal # 2 and the cluster # 2 of the terminal # 3 shown in FIG. 5 partially overlap in frequency bands and have the same OCC sequence (OCC # 1) used in both. For this reason, cluster # 2 of terminal # 2 and cluster # 2 of terminal # 3 are not orthogonal (non-orthogonal), and inter-sequence interference occurs.
  • OCC # 1 OCC sequence
  • cluster # 2 of terminal # 2 and cluster # 2 of terminal # 3 are not orthogonal (non-orthogonal), and inter-sequence interference occurs.
  • the base station schedules frequency resources with priority given to a band with good channel quality of each terminal. I can't. That is, there is a problem that the effect of improving the system performance by MU-MIMO is limited.
  • a method of newly adding a signaling bit (notification information) for notifying an OCC sequence number at the time of non-continuous band transmission as control information notified by a downlink channel is conceivable.
  • the base station can notify the terminal of the OCC sequence number for each cluster.
  • the OCC sequence multiplied by the DM-RS of one of the two clusters (here, cluster # 1) is the cyclic shift amount information (3 bits) notified to the terminal by the base station as described above. (For example, refer to FIG. 4).
  • the OCC sequence to be multiplied by the DM-RS of the other cluster (here, cluster # 2) is notified by the signaling bit.
  • the signaling bit to be added is 1 bit.
  • the OCC sequence used in cluster # 2 is the same OCC sequence as the OCC sequence used in cluster # 1 when the signaling bit is “0”, and is the cluster # 1 when the signaling bit is “1”.
  • the OCC sequence is different from the OCC sequence used.
  • the terminal # 1 shown in FIG. 6 is notified of the OCC # 2 by the cyclic shift amount information to the cluster # 1. Further, terminal 0 is notified of “0” by a signaling bit (1 bit). Therefore, the terminal # 1 uses the OCC # 2 in the cluster # 1 and uses the same OCC # 2 as the cluster # 1 in the cluster # 2. The same applies to terminal # 2 shown in FIG.
  • the terminal # 3 shown in FIG. 6 is notified of the OCC # 1 by the cyclic shift amount information to the cluster # 1. Also, the terminal # 3 is notified of “1” by a signaling bit (1 bit). Therefore, terminal # 3 uses OCC # 1 in cluster # 1, and uses (reverse) OCC # 2 different from cluster # 1 in cluster # 2.
  • the base station can freely set the OCC sequence (OCC sequence number) for each cluster, the degree of freedom of frequency scheduling in MU-MIMO without being restricted by MU-MIMO (see, for example, FIG. 5). Can improve system throughput performance.
  • OCC sequence OCC sequence number
  • An object of the present invention is to provide a transmission device, a reception device, a signal generation method, and a quality estimation method that allow a base station to set an OCC sequence used in a terminal for each cluster without increasing the number of signaling bits. It is.
  • the transmission apparatus includes, according to a sequence determination rule, any one of a plurality of cyclic shift sequences that can be separated from each other by different cyclic shift amounts, and any one of a plurality of orthogonal sequences that are orthogonal to each other.
  • the cluster includes a first cluster and a second cluster, and the sequence determination rule includes a first orthogonal sequence used in each antenna port in the first cluster, and each antenna port in the second cluster.
  • the configuration is the same.
  • a receiving apparatus includes any one of a plurality of cyclic shift sequences arranged in each of a plurality of clusters and separable from each other by different cyclic shift amounts, and a plurality of orthogonal sequences orthogonal to each other.
  • Channel quality is estimated using reception means for receiving a signal including a reference signal generated based on any one of them, a cyclic shift sequence and an orthogonal sequence determined according to a sequence determination rule, and the reference signal And a plurality of clusters including a first cluster and a second cluster, and the sequence determination rule includes a first orthogonal sequence used at each antenna port in the first cluster, and , Including a plurality of pattern candidates of a sequence composed of a second orthogonal sequence used at each antenna port in the second cluster, Among the pattern candidates, in some pattern candidates, the first orthogonal sequence and the second orthogonal sequence for the same antenna port are different from each other. A configuration is employed in which one orthogonal sequence and the second orthogonal sequence are the same.
  • a signal generation method includes a plurality of orthogonal shift sequences that are transmitted from at least one antenna port and that can be separated from each other by different cyclic shift amounts, and a plurality of orthogonal sequences that are orthogonal to each other.
  • a cyclic shift sequence and an orthogonal sequence are determined, and the sequence determination rule includes a first orthogonal sequence used at each antenna port in the first cluster and a second orthogonal sequence used at each antenna port in the second cluster.
  • a plurality of pattern candidates of a sequence consisting of orthogonal sequences, and some pattern candidates among the plurality of pattern candidates The first orthogonal sequence and the second orthogonal sequence for the same antenna port are different from each other, and the pattern candidates other than the partial pattern candidates include the first orthogonal sequence and the second orthogonal sequence for the same antenna port. To be identical.
  • a quality estimation method includes a plurality of orthogonal shift sequences orthogonal to each other and any one of a plurality of cyclic shift sequences that are received by at least one antenna port and can be separated from each other by different cyclic shift amounts.
  • the plurality of clusters include a first cluster and a second cluster, and the sequence determination rule is a first orthogonality used at each antenna port in the first cluster.
  • the first orthogonal sequence and the second orthogonal sequence for the same antenna port are different from each other, and in the pattern candidates other than the some pattern candidates, the same antenna is used.
  • the first orthogonal sequence and the second orthogonal sequence for a port are the same.
  • the base station can set the OCC sequence used by the terminal for each cluster without increasing the number of signaling bits.
  • the figure which shows the mode of continuous band allocation and non-continuous band allocation The figure which shows an example of a cyclic shift series
  • the figure which shows an example of the OCC series The figure which shows the correspondence of cyclic shift amount information, cyclic shift amount, and OCC series
  • the block diagram which shows the main structures of the base station which concerns on one embodiment of this invention The block diagram which shows the main structures of the terminal which concerns on one embodiment of this invention.
  • the block diagram which shows the structure of the base station which concerns on one embodiment of this invention The block diagram which shows the structure of the terminal which concerns on one embodiment of this invention
  • the figure which shows the corresponding relationship of cyclic shift amount information, cyclic shift amount, and an OCC series which concerns on one embodiment of this invention (setting example 1)
  • the figure which shows a mode that an OCC series is set for every cluster which concerns on one embodiment of this invention.
  • the figure which shows the correspondence of the cyclic shift amount information which concerns on one embodiment of this invention, a cyclic shift amount, and an OCC series (setting example 2)
  • the figure which shows the correspondence of the cyclic shift amount information which concerns on one embodiment of this invention, a cyclic shift amount, and an OCC series (setting example 3)
  • the figure which shows the correspondence of the cyclic shift amount information which concerns on one embodiment of this invention, a cyclic shift amount, and an OCC series (setting example 4)
  • the figure which shows the subject which concerns on the example 4 of a setting of one embodiment of this invention The block diagram which shows the structure of the other base station of this invention
  • the block diagram which shows the structure of the other terminal of this invention The figure which shows a mode that an OCC series is set for every other cluster of this invention.
  • the figure which shows a mode that an OCC series is set for every other cluster of this invention.
  • the transmission device is a terminal device
  • the reception device is a base station device.
  • FIG. 7 shows the main components of base station 100 according to the present embodiment.
  • the base station 100 shown in FIG. 7 includes any one of a plurality of cyclic shift sequences (CS sequences) separable from each other by different cyclic shift amounts, and any one of a plurality of orthogonal sequences (OCC sequences) orthogonal to each other.
  • the channel quality is estimated using the reference signal (DM-RS) generated based on the above.
  • receiving section 105 receives a signal including DM-RS, which is arranged in each of a plurality of clusters and transmitted from a terminal apparatus.
  • the estimation unit 112 estimates the channel quality using the cyclic shift sequence and OCC sequence determined according to the used sequence specification table (sequence determination rule) and the received DM-RS.
  • FIG. 8 shows main components of terminal 200 according to the present embodiment.
  • Terminal 200 shown in FIG. 8 is generated based on any one of a plurality of cyclic shift sequences that can be separated from each other by different cyclic shift amounts and any one of a plurality of orthogonal sequences (OCC sequences) orthogonal to each other.
  • DM-RS to be transmitted from at least one antenna port.
  • generating section 213 generates a DM-RS using a cyclic shift sequence and an orthogonal sequence determined according to a used sequence identification table (sequence determination rule).
  • the transmission unit 212 transmits a transmission signal including DM-RS arranged in each of the plurality of clusters.
  • the plurality of clusters include two clusters (cluster # 1 and cluster # 2), and the use sequence identification table (sequence determination rule) includes the first orthogonal sequence used in each antenna port in cluster # 1.
  • the use sequence identification table includes the first orthogonal sequence used in each antenna port in cluster # 1.
  • the second orthogonal sequence is different from each other, and in the pattern candidates other than some pattern candidates, the first orthogonal sequence and the second orthogonal sequence for the same antenna port are the same.
  • FIG. 9 is a block diagram showing a configuration of base station 100 according to the present embodiment.
  • control information encoding section 101 controls frequency resource allocation information for each terminal 200, MCS (ModulationModCoding Scheme), transmission power, and transmission weight for each antenna port.
  • Control information including weight control information and the like is input from the scheduling unit 113.
  • control information including cyclic shift amount information constituting a DM-RS to be transmitted by each terminal 200 is input from the DM-RS information determination unit 114 to the control information encoding unit 101.
  • the control information encoding unit 101 encodes the control information and outputs the encoded control information to the modulation unit 102.
  • the modulation unit 102 modulates the control information input from the control information encoding unit 101 and outputs the modulated signal to the transmission unit 103.
  • the transmission unit 103 performs transmission processing such as D / A (Digital-to-Analog) conversion, up-conversion, amplification, and the like on the signal input from the modulation unit 102, and transmits the signal subjected to the transmission processing to one or more antennas
  • the data is transmitted from the ports 104-1 and 104-2 to each terminal 200.
  • the receiving units 105-1 and 105-2 and the reception processing units 106-1 and 106-2 are provided corresponding to the antenna ports 104-1 and 104-2.
  • Receiving sections 105-1 and 105-2 receive signals from terminals 200 received via antenna ports 104-1 and 104-2, such as down-conversion and A / D (Analog to Digital) conversion. Processing is performed, and the signal subjected to the reception processing is output to each of the separation units 107 of the reception processing units 106-1 and 106-2.
  • the reception processing units 106-1 and 106-2 employ a configuration including a separation unit 107, DFT (Discrete Fourier Transform) units 108 and 110, and demapping units 109 and 111, respectively.
  • DFT Discrete Fourier Transform
  • the separating unit 107 separates the signal input from the receiving unit 105 into a DM-RS and a data signal. Separation section 107 then outputs the DM-RS to DFT section 108 and outputs the data signal to DFT section 110.
  • the DFT unit 108 performs DFT processing on the DM-RS input from the separation unit 107, and converts the signal from the time domain to the frequency domain. Then, the DFT unit 108 outputs the DM-RS converted into the frequency domain to the demapping unit 109.
  • the demapping unit 109 extracts a part of the DM-RS corresponding to the transmission band of the terminal 200 (desired terminal) to receive from the frequency domain DM-RS input from the DFT unit 108, and extracts the extracted DM-RS. Is output to the estimation unit 112.
  • the DFT unit 110 performs DFT processing on the data signal input from the separation unit 107, and converts the data signal from the time domain to the frequency domain. Then, the DFT unit 110 outputs the data signal converted into the frequency domain to the demapping unit 111.
  • Demapping section 111 extracts a data signal corresponding to the transmission band of terminal 200 (desired terminal) to receive from the frequency domain data signal input from DFT section 110, and MIMO-separates the extracted data signal Output to the unit 115.
  • the estimation unit 112 receives information (cyclic shift sequence and OCC sequence) input from a DM-RS information determination unit 114, which will be described later, and each demapping unit 109 of the reception processing units 106-1 and 106-2.
  • Channel quality (frequency response of the channel) and reception quality are estimated using DM-RS (sometimes referred to as “reception DM-RS”).
  • estimation section 112 calculates a DM-RS replica signal transmitted by the desired terminal based on the cyclic shift sequence and OCC sequence determined by DM-RS information determination section 114. Then, the estimation unit 112 estimates the channel quality and reception quality of the desired terminal by performing a correlation operation between the received DM-RS and the generated replica signal. Then, estimation section 112 outputs an estimated value of channel quality (channel frequency response) used for demodulation of the data signal to MIMO demultiplexing section 115 and outputs an estimation value of reception quality used for scheduling to scheduling section 113.
  • DM-RS sometimes referred to as “reception DM-RS”.
  • the scheduling unit 113 determines the transmission band (frequency resource), transmission power, and transmission weight of each antenna port of the transmission signal transmitted by each terminal 200 according to the reception quality estimation value input from the estimation unit 112. Then, scheduling section 113 outputs control information including the determined information to control information encoding section 101. In addition, scheduling section 113 outputs information including the number of transmission antenna ports of each terminal 200 and the transmission band of each terminal 200 to DM-RS information determination section 114.
  • DM-RS information determination section 114 circulates for DM-RS used in each antenna port of each terminal 200 based on the number of transmission antenna ports of each terminal 200 and the transmission band of each terminal 200 input from scheduling section 113.
  • a shift sequence and an OCC sequence are determined.
  • the cyclic shift sequences are sequences that can be separated from each other by different cyclic shift amounts.
  • the OCC sequences are sequences orthogonal to each other.
  • the DM-RS information determination unit 114 previously stores a table (hereinafter referred to as a used sequence identification table) in which cyclic shift amount information is associated with each sequence number (cyclic shift sequence number and OCC sequence number). Hold.
  • the use sequence identification table is shared between the base station 100 and each terminal 200.
  • the DM-RS information determination unit 114 refers to the use sequence identification table using the number of antenna ports and the transmission band (for example, the number of clusters) set for each terminal 200, and sets each antenna port of each terminal 200.
  • the cyclic shift sequence and OCC sequence for DM-RS used in the above are selected. That is, DM-RS information determination section 114 determines cyclic shift sequences and OCC sequences used for DM-RSs arranged in each of a plurality of clusters set in terminal 200.
  • DM-RS information determining section 114 performs cyclic shift sequence between terminals 200 with overlapping transmission bands (that is, between terminals 200 to which MU-MIMO is applied) in order to reduce inter-sequence interference of DM-RS.
  • the numbers or OCC sequence numbers need to be different from each other.
  • DM-RS information determination section 114 outputs cyclic shift amount information associated with the cyclic shift sequence number and OCC sequence number used by each terminal 200 to control information encoding section 101.
  • the cyclic shift sequence number and the OCC sequence number constituting the DM-RS to be transmitted from each antenna port by terminal 200 are used sequence base table shared between base station 100 and terminal 200, base station 100 Is indirectly notified by the cyclic shift amount information notified from the terminal 200 to the terminal 200. Details of the use sequence identification table will be described later.
  • MIMO separation section 115 uses the estimated frequency response value of the channel input from estimation section 112 to convert the data signals input from demapping sections 111 of reception processing sections 106-1 and 106-2, respectively, into the frequency domain. Equalize and multiply by a predetermined weight. As a result, the data signal is separated into data signals (transmission signals transmitted from the respective antenna ports) of each stream. Then, MIMO separation section 115 outputs the data signal of each separated stream to each IFFT (Inverse Fast Fourier Transform) section 117 of data processing sections 116-1 and 116-2.
  • IFFT Inverse Fast Fourier Transform
  • the data processing units 116-1 and 116-2 are provided corresponding to the number of streams transmitted from the terminal 200, and have a configuration including an IFFT unit 117, a demodulation unit 118, and a decoding unit 119, respectively.
  • the IFFT unit 117 performs IFFT processing on the data signal input from the MIMO separation unit 115 and outputs the data signal after IFFT processing to the demodulation unit 118.
  • Demodulation section 118 performs demodulation processing on the data signal input from IFFT section 117 and outputs the demodulated data signal to decoding section 119.
  • Decoding section 119 performs a decoding process on the data signal input from demodulation section 118 and outputs the data signal as received data from terminal 200.
  • FIG. 10 is a block diagram showing a configuration of terminal 200 according to the present embodiment.
  • receiving section 202 performs down-conversion, A / D conversion, etc., on the signal from base station 100 (FIG. 9) received via at least one antenna port 201-1 and 201-2.
  • the reception process is performed, and the signal subjected to the reception process is output to the demodulation unit 203.
  • the received signal includes frequency resource allocation information for terminal 200, MCS of transmission data, transmission power, weight control information for each antenna port, and control information including cyclic shift amount information.
  • the demodulation unit 203 performs equalization processing and demodulation processing on the reception signal input from the reception unit 202, and outputs the reception signal subjected to these processing to the decoding unit.
  • the control information decoding unit 204 performs a decoding process on the received signal input from the demodulation unit 203, and extracts control information from the signal after the decoding process.
  • Control information decoding section 204 outputs cyclic shift amount information to DM-RS information determination section 205, outputs MCS of transmission data to modulation section 208, outputs resource allocation information to mapping section 209, and sends it to each antenna port. Is output to the transmission weight multiplier 211.
  • the DM-RS information determination unit 205 holds a use sequence identification table shared between the base station 100 and the terminal 200. DM-RS information determination section 205 performs cyclic shift for generating DM-RS to be transmitted by terminal 200 at each antenna port according to the cyclic shift amount information input from control information decoding section 204 and the use sequence identification table. A sequence number and an OCC sequence number are determined. DM-RS information determination section 205 outputs the determined cyclic shift sequence number and OCC sequence number to DM-RS generation section 206.
  • DM-RS generating section 206 generates a DM-RS using the cyclic shift sequence number and OCC sequence number used at each antenna port, which are input from DM-RS information determining section 205, and multiplexes DM-RS 210 Output to. Specifically, DM-RS generating section 206 spreads the cyclic shift sequence corresponding to the cyclic shift amount set by DM-RS information determining section 205 with the OCC sequence set by DM-RS information determining section 205. Then, the spread signal is generated as DM-RS.
  • the generation unit 213 may be configured by combining the configurations of the DM-RS information determination unit 205 and the DM-RS generation unit 206. That is, the generation unit 213 generates a DM-RS composed of a cyclic shift sequence and an OCC sequence in accordance with a use sequence identification table (sequence determination rule).
  • the data processing units 207-1 and 207-2 are provided corresponding to the antenna ports 201-1 and 201-2, and have a configuration including a modulation unit 208, a mapping unit 209, and a multiplexing unit 210, respectively.
  • the modulation unit 208 performs encoding processing and modulation processing on transmission data based on the MCS input from the control information decoding unit 204, and outputs the modulated data signal to the mapping unit 209.
  • the mapping unit 209 maps the data signal input from the modulation unit 208 to a cluster that is a predetermined frequency resource based on the frequency resource allocation information input from the control information decoding unit 204 and outputs the data signal to the multiplexing unit 210.
  • the multiplexing unit 210 time-multiplexes the data signal input from the mapping unit 209 and the DM-RS input from the DM-RS generation unit 206, and outputs the multiplexed signal to the transmission weight multiplication unit 211.
  • the arrangement unit 214 may be configured by combining the configurations of the mapping unit 209 and the multiplexing unit 210. That is, arrangement section 214 (arrangement section 214 corresponding to the antenna port used for transmission), based on the frequency resource allocation information, distributes transmission signals including data signals and DM-RS to a plurality of clusters that are frequency resources. Place each one.
  • transmission weight multiplication section 211 multiplies each multiplexed signal input from each multiplexing section 210 of data processing sections 207-1 and 207-2 by a transmission weight. Then, the multiplexed signals after multiplication are output to transmission sections 212-1 and 212-2, respectively.
  • the transmission units 212-1 and 212-2 are provided corresponding to the antenna ports 201-1 and 201-2.
  • Each transmission unit 212 performs transmission processing such as D / A conversion, up-conversion, and amplification on the multiplexed signal input from the transmission weight multiplication unit 211, and transmits the signal subjected to the transmission processing to the antenna ports 201-1 and 201. -2 to base station 100.
  • the DM-RS is transmitted from at least one antenna port 201-1 and 201-2 to the base station 100.
  • the base station 100 and the terminal 200 are based on a use sequence identification table (for example, see FIG. 4) used in LTE.
  • the cyclic shift sequence number and OCC sequence number used as DM-RS are specified.
  • the frequency resource allocation information for terminal 200 indicates discontinuous band transmission (number of clusters: 2, for example, cluster # 1 and cluster # 2)
  • base station 100 and terminal 200 use sequences for discontinuous band transmission.
  • the cyclic shift sequence number and the OCC sequence number used as DM-RSs transmitted respectively in cluster # 1 and cluster # 2 are identified. Note that the cyclic shift sequence used as the DM-RS transmitted in each cluster during discontinuous band transmission is common (identical) between the clusters.
  • the terminal 200 is notified of cyclic shift amount information (Cyclic Shift Field) defined by 8 types (3 bits) of “9, 10”.
  • terminal 200 identifies the cyclic shift sequence and the OCC sequence for each cluster according to the usage sequence identification table and the cyclic shift amount information notified from base station 100.
  • the cyclic shift sequence number and the OCC sequence number constituting the DM-RS in each cluster to be transmitted from each antenna port by terminal 200 are indirectly notified by the cyclic shift amount information notified from base station 100. Is done.
  • the OCC sequence of cluster # 2 is different from the OCC sequence obtained by inverting the OCC sequence of cluster # 1 (that is, the OCC sequence of cluster # 1).
  • OCC series is partially included. That is, among the eight types of pattern candidates indicated in the cyclic shift amount information (Cyclic Shift Field), some of the pattern candidates have different OCC sequences for cluster # 1 and OCC sequences for cluster # 2 for the same antenna port. . That is, within the pattern candidate, when the OCC sequence of cluster # 1 at a certain antenna port is OCC # 1, the OCC sequence of cluster # 2 is cluster # 2, and the OCC sequence of cluster # 1 is OCC # 2. In this case, the OCC sequence of cluster # 2 is cluster # 1.
  • the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 are the same for the same antenna port in other pattern candidates other than the part of the patterns described above.
  • Cyclic Shift Field is cyclic shift information (3 bits).
  • CS value indicates the cyclic shift amount used for the antenna port number ⁇
  • OCC (Cluster # 1) indicates the OCC sequence used for the cluster # 1 of the antenna port number ⁇
  • OCC (Cluster # 2) Indicates an OCC sequence used in cluster # 2 of antenna port number ⁇ .
  • FIG. 11 shows an example of a use sequence identification table (sequence determination rule) at the time of discontinuous band transmission in setting example 1.
  • the OCC sequence and cluster # 2 used in cluster # 1 for the same antenna port are used.
  • the OCC sequences used are different from each other, and in other cyclic shift amount information, the OCC sequences used in cluster # 1 and the OCC sequences used in cluster # 2 for the same antenna port are the same.
  • the combination of the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 at each antenna port is [OCC # 1, OCC # 1], [OCC # 1]. , OCC # 2], [OCC # 2, OCC # 1], and [OCC # 2, OCC # 2]. That is, the use sequence identification table shown in FIG. 11 includes all combinations (combinations of four patterns) that can be taken using OCC # 1 and OCC # 2.
  • the combination of the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 includes a combination of two patterns [OCC # 1, OCC # 1] and [OCC # 2, OCC # 2].
  • the number of OCC sequences that can be set in each cluster by one terminal 200 can be increased while maintaining the same number of signaling bits (3 bits) as in the prior art. .
  • the prior art (FIGS. 5 and 6) and the setting example 1 (FIG. 12) are compared.
  • base station 100 notifies cyclic shift amount information (3 bits) to terminals 1 to 3 (terminal 200) as in the conventional case.
  • Each of the terminals 1 to 3 specifies the OCC sequences of the cluster # 1 and the cluster # 2 according to the cyclic shift amount information notified from the base station 100 and the use sequence specifying table shown in FIG.
  • the base station 100 can set an OCC sequence for each cluster for each of the terminals 1 to 3.
  • the number of signaling bits for notifying the OCC sequence is 3 bits as in FIG. Therefore, in setting example 1, it is possible to perform MU-MIMO in the same manner as in FIG. 6 using the same signaling amount as in FIG.
  • base station 100 uses the use sequence identification table shown in FIG. 11, thereby freeing frequency scheduling in MU-MIMO without adding a new signaling bit to the prior art.
  • the degree can be improved.
  • system throughput performance can be improved.
  • a cyclic shift sequence it is known that the orthogonality increases as the interval of the cyclic shift amount increases.
  • the OCC sequences in the cyclic shift amount information having adjacent cyclic shift amounts are different between cluster # 1 and cluster # 2. .
  • the degree of freedom of frequency scheduling in MU-MIMO is improved. be able to.
  • FIG. 13 shows an example of a used sequence identification table (sequence determination rule) at the time of discontinuous band transmission in setting example 2.
  • the use sequence identification table shown in FIG. 13 As in setting example 1 (FIG. 11), among the 8 types of cyclic shift amount information (that is, 8 types of pattern candidates), some of the cyclic shift amount information uses the same antenna.
  • the OCC sequence used in cluster # 1 for the port and the OCC sequence used in cluster # 2 are different from each other, and in other cyclic shift amount information, the OCC sequence and cluster # used in cluster # 1 for the same antenna port are used.
  • the OCC sequence used in 2 is the same.
  • the combination of the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 at each antenna port is [OCC # 1] as in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] [OCC # 1, OCC # 2], [OCC # 2, OCC # 1], and [OCC # 2, OCC # 2].
  • the use sequence identification table shown in FIG. 13 includes all combinations (combinations of four patterns) that can be taken using OCC # 1 and OCC # 2.
  • the base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO without adding a signaling bit to the prior art. .
  • a scheduling gain by MU-MIMO can be obtained, system throughput performance can be improved.
  • the OCC sequence of cluster # 2 is the same as the OCC sequence of cluster # 1, and OCC # 1 ( [1 1]).
  • the OCC sequence of cluster # 2 is inverted from the OCC sequence of cluster # 1 and becomes OCC # 2 ([1 ⁇ 1]) at all antenna ports.
  • the OCC sequences used in cluster # 1 are the same in all antenna ports, and the types of the OCC sequences are the same.
  • the shift amount information (pattern candidates) on the one hand, the OCC sequence used in cluster # 1 for the same antenna port and the OCC sequence used in cluster # 2 are different from each other, and on the other hand, the cluster # for the same antenna port.
  • the OCC sequence used in 1 and the OCC sequence used in cluster # 2 are the same.
  • the OCC sequences are not orthogonal.
  • transmission bands of signals transmitted from all antenna ports are set to be the same. Therefore, in one terminal 200, DM-RS orthogonalization using a cyclic shift sequence can be realized even if DM-RS orthogonalization using an OCC sequence cannot be realized by using the same OCC sequence between antenna ports.
  • the base station 100 uses the use sequence identification table shown in FIG. 13 to provide the maximum number of OCC sequences for cluster # 1 and cluster # 2 for a plurality of terminals 200 transmitting at 3 antenna ports or more.
  • a combination of 4 patterns can be set. That is, base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO for terminal 200 that transmits with three or more antenna ports.
  • the base station 100 can set four different combinations of OCC sequences for the terminal 200 that transmits with two antenna ports or less. That is, base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO for terminal 200 that transmits at two antenna ports or less. This improves system throughput performance.
  • FIG. 14 shows an example of a used sequence identification table (sequence determination rule) at the time of discontinuous band transmission in setting example 3.
  • some cyclic shift amount information uses the same antenna.
  • the OCC sequence used in cluster # 1 for the port and the OCC sequence used in cluster # 2 are different from each other, and in other cyclic shift amount information, the OCC sequence and cluster # used in cluster # 1 for the same antenna port are used.
  • the OCC sequence used in 2 is the same.
  • the combination of the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 at each antenna port is [OCC # 1] as in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] [OCC # 1, OCC # 2], [OCC # 2, OCC # 1], and [OCC # 2, OCC # 2].
  • the use sequence identification table shown in FIG. 14 includes all combinations (combinations of four patterns) that can be taken using OCC # 1 and OCC # 2.
  • the base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO without adding a signaling bit to the prior art. .
  • a scheduling gain by MU-MIMO can be obtained, system throughput performance can be improved.
  • the OCC sequence of cluster # 2 is the same as the OCC sequence of cluster # 1, whereas “111”. Then, the OCC sequence of cluster # 2 is inverted from the OCC sequence of cluster # 1.
  • the same OCC is used in the cluster # 1 and the cluster # 2 in the four types of cyclic shift amount information among the eight types of cyclic shift amount information (pattern candidates). Sequences are associated with each other, and the remaining half of the four types of cyclic shift amount information are associated with different OCC sequences in cluster # 1 and cluster # 2.
  • the base station 100 uses the use sequence identification table shown in FIG. 14 to provide four different OCC patterns for a plurality of terminals 200 transmitting at three antenna ports or more.
  • FIG. 15 shows an example of a used sequence identification table (sequence determination rule) at the time of discontinuous band transmission in setting example 4.
  • some cyclic shift amount information uses the same antenna.
  • the OCC sequence used in cluster # 1 for the port and the OCC sequence used in cluster # 2 are different from each other, and in other cyclic shift amount information, the OCC sequence and cluster # used in cluster # 1 for the same antenna port are used.
  • the OCC sequence used in 2 is the same.
  • the combination of the OCC sequence of cluster # 1 and the OCC sequence of cluster # 2 at each antenna port is [OCC # 1] as in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] As in setting example 1 (FIG. 11).
  • OCC # 1] [OCC # 1, OCC # 2], [OCC # 2, OCC # 1], and [OCC # 2, OCC # 2].
  • the use sequence identification table shown in FIG. 15 includes all combinations (combinations of 4 patterns) that can be taken by OCC # 1 and OCC # 2.
  • the base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO without adding a signaling bit to the prior art. .
  • a scheduling gain by MU-MIMO can be obtained, system throughput performance can be improved.
  • a pair of cyclic shift amount information (pattern candidates) having the same combination of cyclic shift amounts used at the time of two-antenna port transmission is “010” in addition to “000” and “001”. And '111' pairs, 011 'and' 110 'pairs, and 100' and '101' pairs.
  • the OCC sequence used in cluster # 1 and the OCC sequence used in cluster # 2 for the same antenna port are different from each other, and other than the above part pairs
  • the OCC sequence used in cluster # 1 and the OCC sequence used in cluster # 2 for the same antenna port are the same.
  • cyclic shift amount information for the same cyclic shift amount used when transmitting two antenna ports is notified to different terminals.
  • FIG. 16 it is assumed that cyclic shift amount information “011” is notified to terminal # 1, and cyclic shift amount information “110” is notified to terminal # 2.
  • # 2 is set, and OCC # 1 is set to cluster # 2.
  • FIG. 16 shows that the terminal # 1 and the terminal # 2 are orthogonal to each other because the OCC sequences are different for the cluster # 1, and MU-MIMO can be applied.
  • the orthogonal relationship does not hold, and MU-MIMO cannot be applied.
  • setting example 3 (FIG. 14)
  • a band to which MU-MIMO cannot be applied is generated. For this reason, there is a problem that the degree of freedom of frequency scheduling in MU-MIMO is reduced, and the scheduling gain by MU-MIMO is limited.
  • each terminal 200 receives the cluster # 1 and the cluster # 1.
  • Different OCC sequences can be used in both of # 2. Therefore, in setting example 4, compared with setting example 3 (FIG. 14), the degree of freedom of frequency scheduling in MU-MIMO can be further improved, and the scheduling gain by MU-MIMO can be improved.
  • # 1, OCC # 1], [OCC # 1, OCC # 2], [OCC # 2, OCC # 1], and [OCC # 2, OCC # 2] are determined to be equally two each. It becomes possible. Therefore, as in setting example 3, base station 100 can improve the degree of freedom of frequency scheduling in MU-MIMO for terminal 200 transmitting at two antenna ports or less than setting example 2 (FIG. 13). This improves system throughput performance.
  • the base station 100 uses the use sequence identification table shown in FIG. 14 to provide four different OCC patterns for a plurality of terminals 200 transmitting at three antenna ports or more.
  • pattern candidates representing combinations of OCC sequences of cluster # 1 and cluster # 2 in the used sequence identification table shared by base station 100 and terminal 200 are described.
  • some pattern candidates have different OCC sequences between clusters, and pattern candidates other than the above-mentioned some pattern candidates have the same OCC sequences between clusters.
  • the base station 100 can use all possible patterns as OCC sequence patterns that can be set in the cluster # 1 and the cluster # 2. Thereby, the base station 100 can set the OCC sequence used in DM-RS for the terminal 200 for each cluster. Therefore, base station 100 can set different OCC sequences for a plurality of terminals 200 even in the same transmission band, and can improve the degree of freedom of scheduling in MU-MIMO.
  • the base station 100 does not add a signaling bit for notifying the OCC sequence for DM-RS to the terminal 200 as compared with the conventional case (see, for example, FIG. 4). You can be notified.
  • the base station can set the OCC sequence used by the terminal for each cluster without increasing the number of signaling bits.
  • “one cyclic shift” is selected from two pieces of cyclic shift amount information (pattern candidates) in which the patterns of the OCC sequences used in the plurality of antenna ports of cluster # 1 are the same.
  • the OCC sequences for the same antenna port are different from each other in the cluster # 1 and the cluster # 2
  • the other cyclic shift amount information the OCC sequences for the same antenna port in the cluster # 1 and the cluster # 2. The case where they are the same has been described.
  • which of the two pieces of cyclic shift amount information is the “one cyclic shift amount information” and which is the other cyclic shift amount information is determined based on setting example 4. May be.
  • cyclic shift amount information included in a part of a pair of pattern candidates among combinations of two cyclic shift sequences respectively used in each antenna port when two antenna ports are used.
  • the OCC sequences for the same antenna port are different between the cluster # 1 and the cluster # 2, and the" other cyclic shift amount information "included in a pair other than the part of the pair described above, the cluster # 1 and the cluster # 2
  • the OCC sequences for the same antenna port may be the same. For example, in FIG. 4 (corresponding to the OCC sequence of cluster # 1 at the time of non-continuous band transmission), attention is paid to cyclic shift amount information '000', '001', '010', and '111'.
  • the pattern of the OCC sequence used by the plurality of antenna ports of cluster # 1 is the same between “000” and “111” and between “001” and “010”. Become. Of these, between two “000” and “001”, and between “010” and “111”, two cyclic shift sequences respectively used in each antenna port when two antenna ports are used. The combination is the same. Here, “000” and “001” are called “pair A”, and “010” and “111” are called “pair B”.
  • the cyclic shift amount information included in “pair A” is Cluster # 1 and cluster # 2 have different OCC sequences for the same antenna port, and in the cyclic shift amount information included in “pair B”, cluster # 1 and cluster # 2 have the same OCC sequence for the same antenna port. You may make it become. That is, between “000” and “111”, different OCC sequences are set in cluster # 1 and cluster # 2 in “000” included in “pair A”, and “111” included in “pair B”. In ', the same OCC sequence is set in cluster # 1 and cluster # 2.
  • the use sequence identification table used in the base station 100 and the terminal 200 is the same as in setting example 4 (FIG. 15). As a result, the base station 100 and the terminal 200 using the use sequence identification table can obtain the same effects as those of the setting example 4.
  • the usage sequence identification table described in the present embodiment (for example, FIG. 11, FIG. 13, FIG. 15, and FIG. 15) is used as the usage sequence identification table used at the time of non-continuous band transmission, or the same as in the prior art.
  • the use sequence identification table (for example, FIG. 4, that is, when the same OCC sequence is used in cluster # 1 and cluster # 2) may be switched for each terminal.
  • the case where the use sequence specifying table (FIG. 4) similar to the prior art is used is “pattern 1”, and the case where the use sequence specifying table shown in FIGS.
  • the base station may notify each terminal of “Pattern 1” or “Pattern 2” explicitly in advance by HigherHighlayer signaling.
  • the base station assigns “Pattern 1” and “Pattern 2” to each terminal. May be notified.
  • FIGS. 17 and 18, block diagrams showing configurations of the base station 300 and the terminal 400 in this case are shown in FIGS. 17 and 18, respectively. 17 and 18, the same components as those in the above-described embodiment (FIGS. 9 and 10) are denoted by the same reference numerals, and description thereof is omitted.
  • the terminal information setting unit 301 sets which of the “pattern 1” and “pattern 2” the terminal 400 scheduled by the base station 300 uses.
  • Terminal information setting section 301 outputs the set information (terminal information) to DM-RS information determination section 302.
  • the terminal information setting unit 301 for example, in the plurality of terminals 400 scheduled by the base station 300, the terminal 400 using “pattern 1” and the terminal 400 using “pattern 2” have an equal ratio. Each pattern may be set. At this time, the terminal information setting unit 301 may set each pattern in each terminal 400 at random.
  • the DM-RS information determination unit 302 generates a use sequence identification table used at the time of non-continuous band transmission of each terminal 400 based on the terminal information (“pattern 1” or “pattern 2”) input from the terminal information setting unit 301. to decide. Then, DM-RS information determination section 302 selects the cyclic shift amount and the OCC sequence number constituting DM-RS using the determined used sequence identification table in the same manner as in the above embodiment. DM-RS information determination section 302 then outputs the cyclic shift amount information associated with the selected cyclic shift amount and OCC sequence number to control information encoding section 101.
  • terminal information setting section 401 uses DM-RS to indicate terminal information indicating whether terminal 400 scheduled by base station 300 uses “pattern 1” or “pattern 2”.
  • the information is output to the information determination unit 402.
  • whether the terminal 400 uses “Pattern 1” or “Pattern 2” may be notified explicitly from the base station 300 to the terminal 400, and notified to the Implicit using a terminal ID (fixed ID) or the like. May be.
  • the DM-RS information determination unit 402 determines the used sequence identification table used at the time of non-continuous band transmission based on the terminal information (“pattern 1” or “pattern 2”) input from the terminal information setting unit 401. Then, DM-RS information determination section 402 determines the cyclic shift amount and the OCC sequence number constituting the DM-RS using the determined used sequence identification table in the same manner as in the above embodiment. Then, DM-RS information determination section 402 outputs the determined cyclic shift amount and cyclic shift amount information associated with the OCC sequence number to DM-RS generation section 206.
  • the base station 300 varies the used sequence identification table at the time of discontinuous band transmission between the terminals 400 to be scheduled.
  • “pattern 1” is used for terminals 400 (terminals # 1 and # 2) with odd terminal IDs
  • “pattern 2” is used for terminals 400 (terminal # 3) with even terminal IDs.
  • base station 300 is a terminal in which a pattern capable of orthogonalizing DM-RSs is set. Therefore, a plurality of terminals 400 may be scheduled so that terminals having similar reception qualities are MU-MIMO multiplexed. As a result, the frequency scheduling gain can be improved without increasing the signaling bits as in the above embodiment.
  • the base station has set the “pattern 1” or “pattern 2” for the terminal other than the cyclic shift amount information included in the control information notified in the downlink channel
  • Other parameters may be used for notification.
  • the other parameter may be, for example, a cluster bandwidth, a cluster bandwidth position, or the like.
  • a cluster bandwidth the number of RB (Resource Block) or the number of RBG (RB Group)
  • “pattern 1” is associated with the cluster bandwidth (the number of RBGs). ) May be associated with an odd number and “pattern 2”.
  • “pattern # 1” is associated with the case where the leading RBG number of the cluster band position is an even number
  • “pattern # 2” is associated with the case where the leading RBG number of the cluster band position is an odd number. Also good.
  • the DM-RS information determination unit 114 (FIG. 9) of the base station 100 performs frequency resource allocation information (that is, the cluster bandwidth or the cluster bandwidth position) of each terminal 200 input from the scheduling unit 113. Based on the above, it is determined whether the terminal 200 scheduled by the base station 100 uses “Pattern 1” or “Pattern 2”. Then, the DM-RS information determination unit 114 selects the cyclic shift amount and the OCC sequence number constituting the DM-RS using the determined used sequence identification table in the same manner as in the above embodiment.
  • the DM-RS information determination unit 205 (FIG. 10) of the terminal 200 is based on the frequency resource allocation information (that is, the cluster bandwidth or the cluster band position) input from the control information decoding unit 204. 200 determines whether to use “Pattern 1” or “Pattern 2”. Then, DM-RS information determination section 205 determines the cyclic shift amount and OCC sequence number that constitute DM-RS, using the determined used sequence identification table, in the same manner as in the above embodiment.
  • the cyclic shift amount information and the start position (RB. Start position (RB) of cluster # 1) of the frequency resource for transmitting the uplink signal are the response signal (ACK / NACK signal) from the terminal 200 to the downlink data signal.
  • ACK / NACK signal the response signal from the terminal 200 to the downlink data signal.
  • PHICH resource a transmission resource of a control channel
  • a desired cyclic shift amount may not be set in order to prevent a PHICH resource collision.
  • a desired OCC sequence number is not set in terminal 200, and a transmission band to which MU-MIMO cannot be applied occurs.
  • the OCC sequences of the cluster # 1 and the cluster # 2 are associated with parameters different from the cyclic shift amount information, a desired OCC sequence number cannot be set due to restrictions on the cyclic shift amount information. Can be reduced.
  • the existing parameter is also used as a parameter for determining the used sequence identification table, the number of signaling bits does not increase.
  • the parameter for determining the used sequence identification table is not limited to the frequency resource allocation information, and may be other information as long as it is a parameter notified from the base station to the terminal together with the cyclic shift amount information.
  • the base station 100 and the terminal 200 hold the use sequence identification table for non-continuous band transmission.
  • the base station 100 and the terminal 200 are not limited to holding the used sequence identification table for non-continuous band transmission.
  • the base station 100 and the terminal 200 refer to the conventional table (see FIG. 4).
  • the OCC sequence of cluster # 2 may be calculated according to the correspondence relationship with the sequence) and the sequence determination rules described in setting examples 1 to 4. Thereby, the base station 100 and the terminal 200 can set the OCC of the cluster # 2 without holding a table for determining the OCC of the cluster # 2.
  • the use sequence identification table used at the time of non-continuous band transmission may be different for each cell.
  • inter-sequence interference of reference signals (pilot signals) can be randomized (averaged) between cells.
  • the sequence constituting the DM-RS is not limited to the OCC sequence, and may be an orthogonal sequence or a highly orthogonal sequence.
  • a Walsh sequence may be used.
  • control information notified in the downlink channel may be referred to as DCI (Downlink Control Information) or UL Grant.
  • DCI Downlink Control Information
  • UL Grant UL Grant
  • the antenna port in the above embodiment refers to a logical antenna composed of one or a plurality of physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas.
  • 3GPP LTE it is not defined how many physical antennas an antenna port is composed of, but is defined as a minimum unit by which a base station can transmit different reference signals (Reference signals).
  • the antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).
  • each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • the radio communication apparatus and radio communication method according to the present invention can be applied to a mobile communication system such as LTE-Advanced.

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Abstract

La présente invention se rapporte à un appareil de transmission qui permet à une station de base de définir, pour chacune d'une pluralité de grappes, des séquences OCC, qui doivent être utilisées au niveau de terminaux, sans augmenter le nombre de bits de signalisation. Un module de détermination d'informations de DM-RS (205) détermine, sur la base d'une règle de détermination de séquence, une séquence de décalage cyclique et une séquence orthogonale qui doivent être utilisées pour un DM-RS devant être alloué dans chacune de la pluralité de grappes. Un module de génération de DM-RS (206) génère le DM-RS au moyen de la séquence de décalage cyclique et de la séquence orthogonale déterminées par le module de détermination d'informations de DM-RS (205). La règle de détermination de séquence comprend une pluralité de motifs de séquence candidats qui comprennent chacun une première séquence orthogonale devant être utilisée aux ports d'antenne d'une grappe (n° 1) et une seconde séquence orthogonale devant être utilisée aux ports d'antenne d'une grappe (n° 2). Dans certains de la pluralité de motifs candidats, les première et seconde séquences orthogonales pour le même port d'antenne sont différentes l'une de l'autre tandis que dans les autres de la pluralité de motifs candidats, les première et seconde séquences orthogonales pour le même port d'antenne sont les mêmes.
PCT/JP2012/002302 2011-04-15 2012-04-02 Appareil de transmission, appareil de réception, procédé de génération de signal et procédé d'estimation de qualité WO2012140847A1 (fr)

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