WO2013111523A1 - 送信装置及び送信方法 - Google Patents
送信装置及び送信方法 Download PDFInfo
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- WO2013111523A1 WO2013111523A1 PCT/JP2013/000074 JP2013000074W WO2013111523A1 WO 2013111523 A1 WO2013111523 A1 WO 2013111523A1 JP 2013000074 W JP2013000074 W JP 2013000074W WO 2013111523 A1 WO2013111523 A1 WO 2013111523A1
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- transmission bandwidth
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- 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
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
- H04J13/0062—Zadoff-Chu
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- 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
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- 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
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
Definitions
- the present invention relates to a transmission device and a transmission method.
- DM-RS Demodulation-Reference Signal
- CG Computer
- ZC Zadoff-Chu
- each sequence group has a transmission bandwidth (specifically, an allocation bandwidth).
- the number of RBs) and the series are associated with each other.
- Each sequence group is assigned a different number (sequence group number), and one sequence group is allocated to each cell as shown in FIG. 1 (cell-specific sequence group allocation).
- Each sequence group is configured by sequences having high cross-correlation between sequences, thereby reducing the probability that a sequence having high cross-correlation is used in adjacent cells and reducing interference between adjacent cells.
- the terminal Since the code sequence number for DM-RS can be specified, signaling of the code sequence number can be omitted.
- CG sequence different from the ZC sequence is selected in the transmission bandwidth of 1 and 2 RB. Because. That is, since 30 ZC sequences cannot be secured with transmission bandwidths of 1 and 2 RBs, the sequence reuse factor (the number of repetitions of ZC sequence numbers used as DM-RSs) decreases, and the same sequence number is set in adjacent cells. There is a risk that inter-cell interference will increase. Therefore, CG sequences are adopted for transmission bandwidths 1 and 2 RB.
- sequence length of a ZC sequence is a prime number
- ZC sequence DM-RS code sequence
- Extension a sequence in which the head portion of the ZC sequence smaller than the size of DM-RS is copied (Extension) Is used (see, for example, FIG. 2).
- the ZC sequence is a type of CAZAC (Constant Amplitude and Zero Auto-correlation Code) sequence and is represented by the following equation (1). Further, (ZC sequence length N ZC RS ⁇ 1) ZC sequences are generated.
- CAZAC Constant Amplitude and Zero Auto-correlation Code
- sequence group number u is related to cell ID (N ID cell ), and sequence group hopping is applied to randomize interference between sequence groups. Yes.
- a combination in which the value of q / N ZC RS which is the ratio between the ZC sequence number q and the ZC sequence length N ZC RS , is assigned to the same sequence group.
- a sequence in which q / N ZC RS between sequences is close means a sequence having a high cross-correlation between sequences. Thereby, the cross correlation between series groups can be made small (for example, refer patent document 1).
- the CG sequence is expressed by, for example, the following formula (4) (for example, see Non-Patent Document 1).
- ⁇ (n) shown in Expression (4) is defined as shown in FIG. 3 for each sequence group number u for the transmission bandwidth 1 RB, and as shown in FIG. 4 for each sequence group number u for the transmission bandwidth 2 RB. (For example, refer nonpatent literature 1).
- HetNet HetNet
- LPN Low Power Node
- RRH Remote Radio Head
- a communication system in which a plurality of cells (base stations) cooperate with each other to transmit and receive signals to and from a terminal in the HetNet environment, mainly for the purpose of improving the throughput of users existing at the cell edge.
- CoMP Coordinatd multiple point transmission and reception
- a plurality of cells (base stations) receive and combine signals from one terminal in cooperation to improve reception quality.
- terminals are coordinated between a plurality of cells in a CoMP set (a group of cells that transmit and receive in a coordinated manner) so that inter-cell interference does not increase.
- a plurality of terminals to which UL CoMP is applied that is, terminals in which transmission signals are received and synthesized in cooperation with a plurality of cells (hereinafter referred to as UL CoMP terminals).
- MU-MIMO Multiple (User-Multiple Input Multiple Output) communication is also being studied.
- MIMO communication is a technique in which a plurality of antennas are provided on the transmission / reception side, and simultaneous spatial multiplexing transmission of different signal sequences at the same frequency is possible.
- MU-MIMO communication is a technique for performing MIMO communication between a plurality of terminals and a base station, and can improve the frequency utilization efficiency of the system.
- DM-RSs orthogonal between the terminals in order to separate signals of different terminals, it is necessary to transmit DM-RSs orthogonal between the terminals.
- As an orthogonalization method of DM-RS application of OCC (Orthogonal Cover Code) or use of a ZC sequence (CS-ZC sequence) subjected to different CS (Cyclic Shift) between terminals may be used.
- OCC Orthogonal Cover Code
- CS-ZC sequence Cyclic Shift
- DM-RSs of up to two terminals (UEs) can be orthogonalized.
- the CS-ZC sequence is a sequence obtained by cyclically shifting the ZC sequence.
- a CS-ZC sequence by setting a value larger than the maximum propagation delay time of a terminal transmission signal as a cyclic shift amount, a plurality of CS-ZC sequences obtained by cyclically shifting a ZC sequence having the same sequence number can be orthogonalized. Can do.
- DM-RSs are received in a plurality of different cells. Therefore, in the above-described cell-specific sequence group allocation, the sequence numbers used between terminals introducing MU-MIMO communication differ, and DM -RS may not be orthogonalized. Therefore, as shown in FIG. 5, for a terminal to which CoMP is applied, not a cell-specific sequence (Group # 0, # 1 in FIG. 5), but a UE-specific sequence (in FIG. In Group 5, Group # 2) is introduced, and it is under consideration to orthogonalize DM-RS between UL CoMP terminals.
- Non-Patent Document 2 applies a cyclic shift (CS: Cyclic Shift) corresponding to the transmission bandwidth to the ZC sequences, so that the same sequence group ( It is disclosed that CS-ZC sequences having different transmission bandwidths within a combination of sequences having q / N ZC RSs close to each other can be orthogonalized. Thereby, in MU-MIMO communication, the number of terminals that can orthogonalize DM-RS can be increased, and the number of multiplexed MU-MIMO communication can be increased.
- CS Cyclic Shift
- An object of the present invention is to provide a transmission apparatus and a transmission method capable of improving CoMP performance and increasing the number of multiplexed MU-MIMO communications by orthogonalizing DM-RSs having different transmission bandwidths. .
- the transmission apparatus uses a reference signal having a transmission bandwidth less than a predetermined number as a reference signal having a transmission bandwidth greater than or equal to the predetermined number when cooperative reception by a plurality of reception apparatuses is applied.
- a transmission means for transmitting the reference signal is not limited to transmitting the reference signal.
- a reference signal having a transmission bandwidth less than a predetermined number is used as a reference signal having a transmission bandwidth greater than the predetermined number. If the first sequence is generated and the cooperative reception is not applied, a reference signal having a transmission bandwidth less than the predetermined number is generated using a second sequence different from the first sequence, and the reference Send a signal.
- FIG. 5 is a diagram for explaining orthogonalization between ZC sequences and orthogonalization between ZC sequences and CG sequences. Diagram used to explain the difference in reuse factor depending on whether CoMP is applied.
- the block diagram which shows the main structures of the terminal which concerns on Embodiment 1 of this invention.
- the block diagram which shows the structure of the terminal which concerns on Embodiment 1 of this invention. Flow chart showing DM-RS sequence generation processing in the terminal according to Embodiment 1 of the present invention.
- Flow chart showing generation process of ZC sequence number table according to Embodiment 1 of the present invention (generation example 1)
- the figure which shows an example of the ZC sequence number table which concerns on Embodiment 1 of this invention (generation example 1)
- Flow chart showing generation process of ZC sequence number table according to Embodiment 1 of the present invention (generation example 2)
- the figure which shows an example of the ZC sequence number table which concerns on Embodiment 1 of this invention (generation example 3)
- Flow chart showing generation process of ZC sequence number table according to Embodiment 1 of the present invention (generation example 4)
- the figure which shows an example of the ZC sequence number table which concerns on Embodiment 1 of this invention (generation example 4)
- the figure which shows the extension process and truncation process of ZC series The figure which
- UL between a terminal using a transmission bandwidth of 1 RB or 2 RB and a terminal using a transmission bandwidth of 3 RB or more is performed.
- a method for generating a DM-RS sequence for orthogonalizing a DM-RS even when CoMP is applied a method focused on by the present inventors will be described.
- sequence group numbers 1 to 19 are repeatedly used in FIG. 7A and sequence group numbers 1 to 7 are repeatedly used in FIG. 7B for the same area. That is, in FIG. 7B (with CoMP application), the reuse factor is reduced compared to FIG. 7A (without CoMP application). However, in FIG. 7B, since the same sequence group is applied between cells that receive signals cooperatively by CoMP, even when compared with FIG. 7A, the distance between cells to which the same sequence group is applied is not so short. Don't be.
- CoMP is mainly applied in a HetNet environment, and the distance between the terminal and the base station is shorter than in the past, so the transmission power of the terminal is reduced. Therefore, even if the same sequence number is applied between nearby cells due to a decrease in the reuse factor, interference between cells to which the same sequence number is applied is not a problem.
- the present inventors pay attention to the fact that UL CoMP terminals (terminals to which UE-specific sequences are allocated) do not cause a problem even if the reuse factor of ZC sequence numbers used for DM-RS is reduced. Yes.
- a UL CoMP terminal when transmitting a DM-RS with a transmission bandwidth of 1, 2 RB, a UL CoMP terminal uses a ZC sequence as a DM-RS instead of a CG sequence.
- a ZC sequence As a result, by applying a cyclic shift according to the transmission bandwidth to the ZC sequence (see, for example, Non-Patent Document 2), DM-RSs with different transmission bandwidths (including 1 and 2 RBs) can be orthogonalized. .
- a ZC sequence is used with transmission bandwidths of 1 and 2 RBs, it is possible to increase the number of multiplexing in MU-MIMO communication while suppressing an increase in inter-cell interference due to a decrease in reuse factor. .
- the communication system according to Embodiment 1 of the present invention includes a transmission device and a reception device.
- the transmission apparatus is assumed to be terminal 100 and the reception apparatus is assumed to be base station 200.
- This communication system is, for example, an LTE-Advanced system.
- the terminal 100 is, for example, a terminal that supports the LTE-Advanced system
- the base station 200 is, for example, a base station that supports the LTE-Advanced system.
- signals transmitted from the terminal 100 are received in cooperation by the plurality of base stations 200.
- FIG. 8 is a main configuration diagram of terminal 100 according to Embodiment 1 of the present invention.
- sequence generation section 103 when coordinated reception by a plurality of base stations 200 (receiving devices) is applied, transmits a DM-RS (reference signal) having a transmission bandwidth less than a predetermined number (here 3RB),
- a ZC sequence first sequence
- a DM-RS having a transmission bandwidth less than the predetermined number is converted to a ZC sequence.
- a different CG sequence second sequence
- the transmission unit 112 transmits DM-RS.
- FIG. 9 is a block diagram showing a configuration of terminal 100 according to the present embodiment.
- FIG. 10 is a flowchart showing a process of generating a DM-RS code sequence (DM-RS sequence) in terminal 100.
- transmission bandwidth setting section 101 sets a DM-RS transmission bandwidth (step shown in FIG. 10 (hereinafter referred to as “ST”) 1), and sets the set transmission bandwidth as a sequence generation section. 103 to the sequence switching unit 104 and the sequence information calculation unit 106.
- CoMP mode setting section 102 sets whether or not to apply CoMP mode or whether or not to apply a UE-specific sequence (ST2 shown in FIG. 10), and sets information indicating whether or not to apply the sequence switching of sequence generating section 103. To unit 104 and sequence information calculation unit 106.
- Sequence generation section 103 depends on the DM-RS transmission bandwidth set by transmission bandwidth setting section 101 and the presence / absence of application of CoMP mode (UE-specific sequence) set by CoMP mode setting section 102.
- a DM-RS sequence is generated.
- Sequence generation unit 103 mainly includes sequence switching unit 104, ZC sequence number table 105, sequence information calculation unit 106, ZC sequence generation unit 107, and CG sequence generation unit 108.
- sequence switching section 104 switches a sequence to be used as a DM-RS sequence between a ZC sequence and a CG sequence based on the transmission bandwidth of DM-RS and the presence / absence of application of CoMP mode (FIG. ST3 shown in FIG.
- the sequence switching unit 104 selects a ZC sequence regardless of whether or not the CoMP mode is applied when the transmission bandwidth is 3 RBs or more.
- sequence switching section 104 selects a ZC sequence when the transmission bandwidth is 1 RB and CoMP is applied.
- sequence switching section 104 selects a CG sequence when the transmission bandwidth is 1, 2 RB and CoMP is not applied.
- sequence switching section 104 selects a ZC sequence used for DM-RS with a transmission bandwidth of 3 RBs or more when CoMP mode is applied when the transmission bandwidth is 1 RB, and CoMP mode is When not applied, a CG sequence different from the ZC sequence used for DM-RS having a transmission bandwidth of 3 RBs or more is selected.
- Sequence switching unit 104 outputs CG / ZC sequence generation information indicating whether the selected sequence is a CG sequence or a ZC sequence to sequence information calculation unit 106.
- the ZC sequence number table 105 is a table including a correspondence between transmission bandwidths 1 and 2 RB and ZC sequence numbers (for transmission bandwidths 1 and 2 RB) that can be used for DM-RS in each sequence group.
- the table is shared between the terminal 100 and the base station 200. An example of the ZC sequence number table 105 and details of the generation method will be described later.
- Sequence information calculation section 106 derives a sequence group number using cell ID when there is no application of CoMP mode and UE specific sequence information when there is application of CoMP mode (ST4 shown in FIG. 10). Next, sequence information calculation section 106 calculates a sequence number using the derived sequence group number, transmission bandwidth, and CG / ZC sequence generation information (ST5 shown in FIG. 10). At this time, the sequence information calculation unit 106 applies the CoMP mode, and calculates the sequence number with reference to the ZC sequence number table 105 when generating the ZC sequences for 1 and 2 RBs. Sequence information calculation unit 106 outputs sequence information including the calculated sequence number and the type of sequence (CG sequence or ZC sequence) to ZC sequence generation unit 107 and CG sequence generation unit 108.
- ZC sequence generation section 107 When the sequence information indicates that a ZC sequence is to be generated, ZC sequence generation section 107 generates a ZC sequence using the sequence number indicated in the sequence information (ST6 shown in FIG. 10), and converts the ZC sequence into DM-RS. The data is output to the mapping unit 109 as a series.
- CG sequence generation section 108 generates a CG sequence (ST6 shown in FIG. 10) when the sequence information indicates that a CG sequence is generated, and outputs the CG sequence to DM 109 as a DM-RS sequence.
- Mapping section 109 maps the DM-RS sequence (ZC sequence or CG sequence) input from ZC sequence generation section 107 or CG sequence generation section 108 to a band corresponding to the transmission band of terminal 100.
- the mapping unit 109 outputs the mapped DM-RS sequence to an IFFT (Inverse Fast Fourier Transform) unit 110.
- IFFT Inverse Fast Fourier Transform
- the IFFT unit 110 performs IFFT processing on the DM-RS sequence input from the mapping unit 109, and outputs the DM-RS sequence subjected to IFFT processing to a CP (Cyclic Prefix) adding unit 111.
- CP Cyclic Prefix
- CP adding section 111 adds the same signal as the tail part of the signal after IFFT to the beginning as a CP, and outputs it to transmitting section 112.
- the transmission unit 112 performs transmission processing such as D / A conversion, up-conversion, and amplification on the signal after CP addition, and transmits the signal subjected to the transmission processing via the antenna 113 as a DM-RS.
- terminal 100 transmits a data signal along with DM-RS (reference signal) via antenna 113 (not shown).
- FIG. 11 is a block diagram showing a configuration of base station 200 according to the present embodiment.
- transmission bandwidth setting section 201 sets the transmission bandwidth of DM-RS used in terminal 100 in the same manner as transmission bandwidth setting section 101, and generates the set transmission bandwidth as a sequence generation.
- the data is output to the sequence switching unit 204 and the sequence information calculation unit 206 of the unit 203.
- CoMP mode setting section 202 sets whether or not to apply CoMP mode to terminal 100 (whether or not UE specific sequence is applied) in the same manner as CoMP mode setting section 102, and generates information indicating the above application or not.
- the data is output to the sequence switching unit 204 and the sequence information calculation unit 206 of the unit 203.
- sequence generation section 203 uses DM-RS transmission bandwidth set by transmission bandwidth setting section 201 and CoMP mode (UE-specific sequence set by CoMP mode setting section 202). ) To generate a DM-RS sequence to be used by the terminal 100.
- Sequence generation unit 203 is mainly configured by sequence switching unit 204, ZC sequence number table 205, sequence information calculation unit 206, ZC sequence generation unit 207, and CG sequence generation unit 208.
- sequence switching section 204 converts a sequence to be used as a DM-RS sequence in terminal 100 based on the transmission bandwidth of DM-RS and the presence / absence of application of CoMP mode to a ZC sequence. And switch between CG series. That is, sequence switching section 204, like sequence switching section 104, is a ZC sequence used for DM-RS having a transmission bandwidth of 3 RBs or more when the transmission bandwidth is 1, 2 RBs, or when CoMP mode is applied. When the CoMP mode is not applied, a CG sequence different from the ZC sequence used for DM-RS having a transmission bandwidth of 3 RBs or more is selected. Sequence switching unit 204 outputs CG / ZC sequence generation information indicating whether the selected sequence is a CG sequence or a ZC sequence to sequence information calculation unit 206.
- the ZC sequence number table 205 is a table in which the transmission bandwidths 1 and 2RB are associated with the ZC sequence numbers that can be used for DM-RS.
- the table is shared between the base station 200 and the terminal 100.
- An example of the ZC sequence number table 105 and details of the generation method will be described later.
- sequence information calculation unit 206 uses the cell ID when there is no application of CoMP mode, and the UE specific sequence information when there is application of CoMP mode, to calculate the sequence group number. To derive. Next, sequence information calculation section 206 calculates a sequence number using the derived sequence group number, transmission bandwidth, and CG / ZC sequence generation information. At this time, the sequence information calculation unit 206 applies the CoMP mode, and calculates the sequence number with reference to the ZC sequence number table 205 when generating the ZC sequences for 1 and 2 RBs. The sequence information calculation unit 206 outputs the sequence information including the calculated sequence number and the type of sequence (CG sequence or ZC sequence) to the ZC sequence generation unit 207 and the CG sequence generation unit 208.
- the ZC sequence generation unit 207 Similar to the ZC sequence generation unit 107, the ZC sequence generation unit 207 generates a ZC sequence using the sequence number indicated in the sequence information and indicates that the ZC sequence is DM- It outputs to the division part 215 as RS series.
- the CG sequence generation unit 208 generates a CG sequence and outputs the CG sequence as a DM-RS sequence to the division unit 215 when the sequence information indicates that a CG sequence is generated.
- the reception unit 210 performs reception processing such as down-conversion and A / D conversion on the signal received via the antenna 209 and outputs the signal subjected to the reception processing to the CP removal unit 211.
- the received signal includes a data signal and DM-RS.
- the CP removal unit 211 removes the CP from the signal subjected to the reception process, and outputs the signal after the CP removal to the separation unit 212.
- the separation unit 212 separates the signal input from the CP removal unit 211 into DM-RS and data signal.
- the separation unit 212 outputs the DM-RS to the FFT (Fast Fourier transform) unit 213 and outputs the data signal to the FFT unit 219.
- FFT Fast Fourier transform
- the FFT unit 213 performs FFT processing on the DM-RS input from the separation unit 212, and converts the signal from the time domain to the frequency domain.
- the FFT unit 213 outputs the DM-RS converted into the frequency domain to the demapping unit 214.
- the demapping unit 214 extracts a part corresponding to the transmission band of each terminal 100 from the frequency domain DM-RS input from the FFT unit 213, and outputs the extracted DM-RS to the division unit 215.
- the division unit 215 divides the DM-RS input from the demapping unit 214 by the DM-RS sequence (ZC sequence or CG sequence) input from the ZC sequence generation unit 207 or CG sequence generation unit 208, and the division result (Correlation value) is output to IFFT section 216.
- the IFFT unit 216 performs IFFT processing on the division result input from the division unit 215, and outputs a signal subjected to IFFT processing to the mask processing unit 217.
- the mask processing unit 217 performs a mask process on the signal input from the IFFT unit 216 to extract a correlation value of a section (window portion) where a correlation value of a desired cyclic shift sequence exists, and the extracted correlation value
- the data is output to the DFT unit 218.
- the DFT unit 218 performs DFT processing on the correlation value input from the mask processing unit 217, and outputs the correlation value subjected to the DFT processing to the frequency domain equalization unit 221.
- the signal that has been subjected to the DFT processing in the DFT unit 218 is a signal that represents a frequency variation of the propagation path (frequency response of the propagation path).
- the FFT unit 219 performs FFT processing on the data signal input from the separation unit 212 and converts the signal from the time domain to the frequency domain.
- the FFT unit 219 outputs the data signal converted into the frequency domain to the demapping unit 220.
- the demapping unit 220 extracts a data signal corresponding to the transmission band of each terminal from the signal input from the FFT unit 219, and outputs each extracted signal to the frequency domain equalization unit 221.
- the frequency domain equalization unit 221 performs equalization processing on the data signal input from the demapping unit 220 using the signal input from the DFT unit 218 (frequency response of the propagation path).
- the signal is output to IFFT section 222.
- the IFFT unit 222 performs IFFT processing on the data signal input from the frequency domain equalization unit 221, and outputs the signal subjected to IFFT processing to the demodulation unit 223.
- Demodulation section 223 performs demodulation processing on the signal input from IFFT section 222 and outputs the demodulated signal to decoding section 224.
- the decoding unit 224 performs a decoding process on the signal input from the demodulation unit 223 and extracts received data.
- the terminal 100 When the terminal 100 is a UL CoMP terminal (a terminal to which the CoMP mode is applied), the terminal 100 generates a DM-RS using a ZC sequence as a DM-RS sequence with a transmission bandwidth of 1, 2 RB. On the other hand, when the terminal 100 is not a UL CoMP terminal, terminal 100 generates a DM-RS as a DM-RS sequence having a transmission bandwidth of 1 and 2 RBs using a CG sequence in the same manner as before.
- a large number of sequences are divided into 30 sequence groups in each transmission bandwidth (1 to 110 RB), and a transmission bandwidth and a sequence are associated with each sequence group.
- the ZC sequence the ZC of the sequence number q having the smallest absolute value of the difference between q b / N b and q / N with respect to the sequence length N corresponding to each of a plurality of transmission bandwidths.
- the series is grouped into groups with group number u.
- N b is the reference sequence length
- q b is the reference sequence number of the group number u. That is, when the CoMP mode is applied, the terminal 100 generates a DM-RS using any one of the grouped ZC sequences.
- the base station 200 when the transmission bandwidth of the DM-RS used for the signal extraction target terminal 100 is 1 or 2 RB, when the terminal 100 is a UL CoMP terminal, -It is determined that the code sequence used as the RS sequence is a ZC sequence, and when the terminal 100 is not a UL CoMP terminal, it is determined that the code sequence used as the DM-RS sequence is a CG sequence.
- a DM-RS having a transmission bandwidth of 1, 2 RBs and a DM-RS having a transmission bandwidth of 3 RBs or more are included. Even in this case, DM-RS can be orthogonalized by CS.
- the number of group groups is 30 (group group numbers 0 to 29).
- One RB is composed of 12 subcarriers.
- the sequence length of the ZC sequence is the maximum prime number within the number of subcarriers corresponding to each transmission bandwidth (number of RBs). For example, the sequence length in the case of 1 RB (12 subcarriers) is 11, the sequence length in the case of 2 RBs (24 subcarriers) is 23, and the sequence length in the case of 3 RBs (36 subcarriers) is 31.
- the sequence number q that is closest to the value of q / N, which is the ratio of the sequence number q of the ZC sequence for 1, 2 RB and the sequence length N, is the UL CoMP terminal (UE specific sequence is Assigned as a ZC sequence number for 1 and 2 RBs. That is, the ZC sequence of sequence number q having the smallest absolute value of the difference between q b / N b and q / N is included in the sequence group of group number u.
- FIG. 12 is a flowchart showing an example of the generation process of the ZC sequence number table (105 shown in FIG. 9 and 205 shown in FIG. 11) corresponding to the transmission bandwidth 1, 2 RB (that is, less than 3 RBs).
- the ZC sequence number table is generated in advance by a table generation unit (or a table generation program, not shown). That is, the terminal 100 and the base station 200 hold in advance a ZC sequence number table (105, 205) generated, for example, by the process shown in FIG.
- the ZC sequence number table generated by the table generation unit may be notified from the base station 200 to the terminal 100, or the ZC sequence table is generated by the table generation unit in the terminal 100 and the base station 200, respectively. Also good.
- the table generation unit may be provided in a device other than the terminal 100 or the base station 200.
- the table generation unit uses, for example, the DM-RS generation method disclosed in Non-Patent Document 1 to generate sequence group information (existing sequence group information. For example, sequence group, ZC sequence number for each transmission band). 3C or more ZC sequence groups) are generated (input).
- the table generation unit sets 0 as the initial value of the sequence group number u in order to obtain the ZC sequence number for each of the 30 sequence groups.
- table generating unit in the sequence group number u, the reference sequence length of the derivation of the ZC sequence number for 1,2RB and as a reference sequence number, the sequence length N b and sequence number q b transmission bandwidth 3RB respectively Set.
- the table generation unit sets 1 as an initial value of sequence number q (1 to sequence length N ⁇ 1), and finally obtains ZC sequence number q ′ for transmission bandwidths 1 and 2RB in sequence group number u.
- the table generating unit measures the absolute value of the difference between q / N and q b / N b, determines greater or not than the absolute value of the variable min is measured.
- the process proceeds to ST106, and when the variable min is equal to or less than the absolute value (ST105: NO), the process proceeds to ST107.
- the table generation unit sets q ′ to q, and sets min to the absolute value of the difference between q / N and q b / N b in the current value of q.
- the table generation unit determines whether q is less than N (that is, whether determination of all the sequence numbers is completed). When q is less than N (ST107: YES), the process proceeds to ST108, and when q is N or more (ST107: NO), the process proceeds to ST109.
- the table generating unit increments q (1 count up), and proceeds to the process of ST105 again.
- the table generation unit calculates the difference between q / N and q b / N b for all q (1 to sequence length N ⁇ 1) in sequence group number u, and finally The value stored in the variable q ′ is assigned to the sequence number of the sequence group number u.
- the table generation unit determines whether or not the sequence group number u (0 to 29) is less than the number of sequence groups (30). If u is less than the number of sequence groups (ST110: YES), the process proceeds to ST111. If u is greater than or equal to the number of sequence groups (ST110: NO), the calculation of the ZC sequence numbers for all the sequence groups has been completed. The generation processing of sequence number table 105 (ZC sequence number table 205) is terminated.
- the table generating unit increments u (1 count up) and proceeds to ST103 again.
- the ZC sequence number tables (105 and 205) are generated.
- FIG. 13 shows an example of the ZC sequence number table 105 (ZC sequence number table 205) generated by the above processing.
- Equation (5) q XRB indicates the sequence number of the transmission bandwidth X [RB]
- NZC_XRB RS indicates the ZC sequence length of the transmission bandwidth X [RB]
- u indicates the sequence group number
- v indicates Indicates a sequence group hopping flag (0 or 1).
- the ZC sequence number of each sequence group in a transmission bandwidth of 3 RBs or more is calculated based on q b (1 to 30 in FIG. 13) and N b (31 RB) in 3 RB (ST101). That is, in FIG. 13, the reference sequence length N b and the reference sequence number q b for transmission bandwidth of 1,2RB (less than 3 RBs) is identical to the reference sequence length and the reference sequence number for more transmission bandwidth 3 RBs.
- terminal 100 uses a ZC sequence as a DM-RS sequence regardless of the transmission bandwidth, so that the transmission bandwidth is 1 RB (or 2 RB) within the CoMP set.
- DM-RS and DM-RS having a transmission bandwidth of 3 RBs or more can be orthogonalized.
- the DM-RS (ZC sequence) does not depend on the transmission bandwidth of the DM-RS.
- the channel estimation system can be improved, and the number of multiplexing in MU-MIMO communication can be increased.
- FIG. 14 is a flowchart showing an example of a generation process of the ZC sequence number table 105 (ZC sequence number table 205) corresponding to the transmission bandwidth 1, 2RB (less than 3RB).
- terminal 100 base station 200
- holds in advance a ZC sequence number table 105 ZC sequence number table 205) generated by the processing shown in FIG.
- FIG. 14 the same reference numerals are given to the same processes as those of the generation example 1 (FIG. 12), and the description thereof is omitted.
- the table generation unit sets an excluded sequence number to an empty set in addition to setting 0 as the initial value of the sequence group number u as in ST102.
- table generating unit measures the absolute value of the difference between similarly q / N and q b / N b and ST105, to determine whether large or not than the absolute value of the variable min is measured In addition, it is determined whether or not q is included in the exclusion sequence number. If the variable min is larger than the absolute value and q is not included in the excluded series number (ST202: YES), the process proceeds to ST106. On the other hand, if the variable min is equal to or smaller than the absolute value or the excluded sequence number includes q (ST202: NO), the process proceeds to ST107.
- the table generation unit counts the number of times the ZC sequence number q ′ obtained by the processes of ST202 and ST106 to ST108 is used.
- the table generating unit determines whether or not the sequence number q′_pre set to the immediately preceding sequence group number (that is, u ⁇ 1) is not equal to the sequence number q ′ of the current group number u. judge. If q'_pre and q 'are not equal (ST204: YES), the process proceeds to ST208. If q'_pre and q' are equal (ST204: NO), the process proceeds to ST205.
- the table generation unit uses the number of sequence numbers q ′ greater than or equal to a value obtained by dividing the number of sequence groups by (ZC sequence length N ⁇ 1) and rounding to the nearest integer greater than the value after division. It is determined whether or not there is.
- the process proceeds to ST206, and when the number of use of sequence number q' is less than the above value (ST205: NO), the process proceeds to ST207.
- the table generating unit adds the ZC sequence number q 'to the excluded sequence number list.
- the table generation unit assigns the value finally stored in the variable q ′ to the sequence number of the sequence group number u in the sequence group number u as in ST109, and adds q′_pre to q ′. Set.
- the table generation unit rounds the value obtained by dividing the number of sequence groups by the number of sequence groups by (ZC sequence length N ⁇ 1) to the nearest integer smaller than the value after division. It is determined whether it is less than the value.
- the process proceeds to ST209, and when the number of use of sequence number q′_pre is equal to or greater than the above value (ST208: NO), the process of ST207 is performed. move on.
- the table generation unit assigns the ZC sequence number q′_pre to the sequence group number u, and proceeds to the process of ST110.
- ZC sequence number table 105 ZC sequence number table 205.
- FIG. 15 shows an example of the ZC sequence number table 105 (ZC sequence number table 205) generated by the above processing.
- ZC sequence number table 205 ZC sequence number table 205.
- a sequence number q that minimizes the absolute value of the difference from q b / N b corresponding to 3RB is assigned.
- the difference in the number of times each ZC sequence number is used is within 1 in each of the transmission bandwidths 1 and 2 RB.
- the difference in the number of groups in which each sequence number is used is within 1 between ZC sequences having different sequence numbers.
- 8, 10, 11, 12, 14, 15, 17, 18, 20 to 23 are respectively used in one sequence group. That is, in FIG. 15, when the transmission bandwidth is 2 RBs, the difference in the number of uses in each sequence group with a different ZC sequence number is 1.
- the number of times the sequence having the same sequence number is used is rounded to the nearest integer greater than the value of ((sequence group number) / ZC sequence length N). Limited.
- the maximum number of times a sequence having the same sequence number is “3” when the transmission bandwidth is 1 RB, and “2” when the transmission bandwidth is 2 RBs.
- the number of times the sequence having the same sequence number is used is rounded to the nearest integer that is at least smaller than the value of ((sequence group number) / ZC sequence length N). Value.
- the minimum number of times the sequence having the same sequence number is “2” when the transmission bandwidth is 1 RB, and “1” when the transmission bandwidth is 2 RBs.
- generation example 1 (FIG. 13) and generation example 2 (FIG. 15) are compared.
- FIG. 15 as described above, when the transmission bandwidth is 1 RB, the difference in the number of uses of each ZC sequence number is 1.
- each ZC sequence number is evenly assigned to the entire plurality of sequence groups. That is, in the generation example 2, the number of times that the same sequence number is repeatedly used in each sequence group can be made smaller than that in the generation example 1. Therefore, in Generation Example 2, compared to Generation Example 1, it is possible to reduce the probability that a sequence group having the same sequence number is used in an adjacent cell, and to further reduce interference between adjacent cells. It becomes possible. Also, in Generation Example 2, as in Generation Example 1, a DM-RS with a transmission bandwidth of 1 RB (or 2 RBs) and a DM-RS with a transmission bandwidth of 3 RBs or more can be orthogonalized.
- transmission bandwidths adjacent to the transmission bandwidths (1RB and 2RB) transmission bandwidths corresponding to q b / N b values serving as references for the transmission bandwidths of 1 and 2 RB
- a transmission bandwidth with a close value is used. That is, the reference sequence length N b for the transmission bandwidth of 1, 2 RB (less than 3 RB) and the reference sequence number q b of the sequence number u are the sequence length according to the transmission bandwidth adjacent to the transmission bandwidth, and The sequence number of the group number u in the adjacent transmission bandwidth.
- the generation process of the ZC sequence number table (105 shown in FIG. 9 and 205 shown in FIG. 11) corresponding to the transmission bandwidth 1, 2 RB (less than 3 RBs) in the generation example 3 is almost the same as the process (FIG. 14) in the generation example 1.
- a ZC sequence number for 1 RB is derived, in ST 103 shown in FIG. 14, a sequence length N b and a sequence number q b of 2 RBs are set.
- the sequence length N b and sequence number q b of 3RB is set.
- FIG. 16 shows an example of the ZC sequence number table 105 (ZC sequence number table 205) in the generation example 3.
- Equation (6) q XRB indicates the sequence number of the transmission bandwidth X [RB]
- NZC_XRB RS indicates the ZC sequence length of the transmission bandwidth X [RB]
- u indicates the sequence group number
- v indicates Indicates a sequence group hopping flag (0 or 1).
- FIG. 17 is a flowchart showing an example of the generation processing of the ZC sequence number table 105 (ZC sequence number table 205) corresponding to the transmission bandwidth 1, 2RB (less than 3RB).
- terminal 100 base station 200
- holds in advance a ZC sequence number table 105 ZC sequence number table 205) generated by the processing shown in FIG.
- FIG. 17 the same processes as those of the generation example 1 (FIG. 12) are denoted by the same reference numerals, and the description thereof is omitted. Specifically, in FIG. 17, the process of ST103 shown in FIG. 12 is not performed, and the processes of ST301 and ST302 are performed instead of the processes of ST105 and ST106, respectively.
- the table generation unit calculates an average value of q rb / N rb of 108 types of transmission bandwidths (3RB to 110RB), and calculates an absolute value of a difference between q / N and the above average value. Measure and determine whether the variable min is greater than the measured absolute value. When the variable min is larger than the absolute value (ST301: YES), the process proceeds to ST302, and when the variable min is equal to or less than the absolute value (ST301: NO), the process proceeds to ST107.
- the table generating unit sets q ′ to q, and sets min to the absolute value of the difference between q / N at the current value of q and the average value.
- Equation (7) q XRB indicates the sequence number of the transmission bandwidth X [RB]
- NZC_XRB RS indicates the ZC sequence length of the transmission bandwidth X [RB]
- u indicates the sequence group number
- v indicates A sequence hopping flag (0 or 1) is indicated, and ave indicates an average value of q rb / N rb in each of 108 transmission bandwidths (3 RB to 110 RB).
- the DM-RS (ZC sequence) can be orthogonalized regardless of the transmission bandwidth of the DM-RS. It is possible to improve the channel estimation system and increase the number of multiplexing in MU-MIMO communication.
- a transmission bandwidth in which a prime factor of the transmission bandwidth (the number of RBs) includes other than 2, 3, and 5 is not used. Therefore, when calculating an average value of q rb / N rb in each of transmission bandwidths of 3 RBs or more (3 RB to 110 RB), q in transmission bandwidths not used in the uplink among transmission bandwidths of 3 RBs or more.
- the value of rb / N rb may be excluded. As a result, it is possible to set the sequence number of the ZC sequence used for DM-RS on the uplink more accurately.
- the generation examples 1 to 4 of the ZC sequence number table 105 (ZC sequence number table 205) used in the terminal 100 (FIG. 9) and the base station 200 (FIG. 11) have been described above.
- sequence generation section 103 sets DM-RSs having a transmission bandwidth less than a predetermined number (3 RBs) to a predetermined number or more.
- a DM-RS sequence having a transmission bandwidth less than a predetermined number is generated using a CG sequence different from the ZC sequence. .
- the generated DM-RS is transmitted via the transmission unit 112.
- the terminal 100 uses a ZC sequence when CoMP is applied, and uses a CG sequence when CoMP is not applied.
- the code sequence used for is switched.
- ZC sequence numbers having a small q / N difference are assigned to the ZC sequences used in transmission bandwidths of 3 RBs or more. Assigned to a series group.
- a DM-RS with a transmission bandwidth of 1 RB and a transmission bandwidth of 3 RB or more DM-RS can be orthogonalized. Therefore, according to the present embodiment, it is possible to improve channel estimation accuracy and increase the number of multiplexing in MU-MIMO communication.
- Embodiment 2 In Embodiment 1, when setting ZC sequences with transmission bandwidths 1 and 2, the sequence length of the ZC sequence corresponds to the transmission bandwidth (number of RBs) as in the case of ZRB sequences for DM-RS of 3 RBs or more. The largest prime number within the number of subcarriers. Therefore, a sequence in which the head portion of the ZC sequence smaller than the DM-RS size is copied (Extension) at the end is used (for example, see FIG. 19A).
- the sequence length of the ZC sequence is the smallest prime number greater than the number of subcarriers corresponding to the transmission bandwidth (number of RBs).
- base station and terminal according to the present embodiment have the same basic configuration as that of base station 100 and terminal 200 according to Embodiment 1, and will be described with reference to FIGS.
- a ZC sequence having a sequence length of 13 is used in transmission bandwidth 1 RB (12 subcarriers).
- a ZC sequence having a sequence length of 29 is used in a transmission bandwidth of 2 RB (24 subcarriers) (not shown).
- FIG. 20 shows a ZC sequence number table 105 (ZC sequence number table 205) obtained when the same processing (for example, FIG. 14) as in Generation Example 1 (FIG. 13) of Embodiment 1 is applied in the present embodiment. An example is shown.
- FIG. 21 shows an example of the ZC sequence number table 105 (ZC sequence number table 205) obtained when the same processing as in Generation Example 3 (FIG. 16) of Embodiment 1 is applied in the present embodiment. Indicates.
- FIG. 22 shows a ZC sequence number table 105 (ZC sequence number) obtained when the same processing (for example, FIG. 17) as generation example 4 (FIG. 18) of Embodiment 1 is applied in the present embodiment.
- An example of the table 205) is shown.
- DM having a transmission bandwidth of 1, 2 RBs -Since RS and DM-RS having a transmission bandwidth of 3 RBs or more can be orthogonalized by CS, channel estimation accuracy can be improved and the number of multiplexing in MU-MIMO communication can be increased.
- CM Cubic Metric. Or PAPR (Peak Average Power Ratio)
- PAPR Peak Average Power Ratio
- sequence group hopping for terminals to which CoMP is applied is different from sequence group hopping for terminals to which CoMP is not applied.
- FIG. 23 is a block diagram showing a configuration of terminal 300 according to the present embodiment.
- the same components as those in Embodiment 1 (FIG. 9) are denoted by the same reference numerals, and the description thereof is omitted.
- FIG. 25 is a flowchart showing DM-RS sequence generation processing in terminal 100.
- the same processes as those in the first embodiment (FIG. 10) are denoted by the same reference numerals, and the description thereof is omitted.
- sequence group hopping control section 301 receives information indicating whether or not its own CoMP is applied from CoMP mode setting section 102. Sequence group hopping control section 301 outputs, for example, an existing sequence group hopping pattern conventionally used to sequence information calculation section 106 when there is no CoMP application (no UE-specific sequence application). On the other hand, sequence group hopping control section 301 outputs, to sequence information calculation section 106, a sequence group hopping pattern different from the sequence group hopping pattern used when CoMP is applied (UE-specific sequence is applied).
- sequence group hopping control section 301 switches sequence group hopping patterns depending on whether CoMP is applied (ST11 shown in FIG. 25). Note that the sequence group hopping pattern used when CoMP is applied is individually notified to terminal 300.
- the existing sequence group hopping pattern is a sequence group hopping pattern used when the transmission bandwidth is 3 RBs or more, for example.
- the sequence information calculation unit 106 derives a sequence group number based on the sequence group hopping pattern input from the sequence group hopping control unit 301 in addition to the transmission bandwidth and whether or not the CoMP mode is applied.
- FIG. 24 is a block diagram showing a configuration of base station 400 according to the present embodiment.
- the same components as those in Embodiment 1 (FIG. 11) are denoted by the same reference numerals, and the description thereof is omitted.
- sequence group hopping control unit 401 receives information indicating whether or not the CoMP is applied to the terminal 300 from the CoMP mode setting unit 202. Sequence group hopping control section 401 outputs, for example, the existing sequence group hopping pattern to sequence information calculation section 206 when CoMP is not applied to terminal 300 (no UE specific sequence is applied). On the other hand, sequence group hopping control section 401 applies a sequence group hopping pattern different from the sequence group hopping pattern used when CoMP is applied to terminal 300 (UE specific sequence is applied) and there is no CoMP application to sequence information calculation section It outputs to 206. That is, sequence group hopping control section 401 switches sequence group hopping patterns according to whether CoMP is applied, as in sequence group hopping control section 301.
- Sequence information calculation section 206 derives a sequence group number based on the sequence group hopping pattern input from sequence group hopping control section 401 in addition to the transmission bandwidth and whether or not CoMP mode is applied.
- terminal 300 when CoMP mode is applied, does not depend on the number of RBs (transmission bandwidth) and does not depend on the sequence group hopping pattern used when CoMP mode is not applied. Use a hopping pattern. Thereby, the fall of the hopping effect of a sequence group can be prevented.
- RRC Radio
- CS hopping when applying CS (cyclic shift) hopping unique to a terminal (UE), CS hopping may be applied to ZC sequences for transmission bandwidths 1 and 2 RB.
- the CoMP mode may be applied to the uplink data channel (PUSCH: Physical Uplink Shared Channel), whereas the CoMP mode may not be applied to the uplink control channel (PUCCH: Physical Uplink Control Channel). Therefore, in the above embodiment, DM-RS (transmission bandwidth 1, 2 RB) transmitted on the PUCCH to which the CoMP mode is not applied is a CG sequence, and DM-RS (transmission on the PUSCH to which the CoMP mode is applied is transmitted. Bandwidth 1, 2RB) may be a ZC sequence.
- the antenna is described as an antenna.
- the present invention can be similarly applied to an antenna port.
- An antenna port refers to a logical antenna composed of one or more 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.
- 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.
- the name used here is LSI, but it may also be called 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 implementation with a dedicated circuit or a general-purpose processor is also possible.
- 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 transmitting apparatus uses a reference signal having a transmission bandwidth less than a predetermined number as a reference signal having a transmission bandwidth of the predetermined number or more. And generating means for generating a reference signal having a transmission bandwidth less than the predetermined number using a second sequence different from the first sequence when the cooperative reception is not applied, and the reference signal And a transmission means for transmitting.
- the reference sequence length is N b
- the reference sequence number of the group number u is q b
- the sequence length N corresponding to each of a plurality of transmission bandwidths is q b / N b
- the first sequence having a sequence number q having the smallest absolute value of q / N is grouped into a group having a group number u, and the generation unit performs grouping when the cooperative reception is applied.
- the reference signal is generated using any one of the generated first sequences.
- the reference sequence length N b and the reference sequence number q b for the transmission bandwidth less than the predetermined number are the same as the reference sequence length and the reference sequence number for the transmission bandwidth of the predetermined number or more. is there.
- the difference in the number of groups in which each sequence number is used is within 1 between the first sequences having different sequence numbers in the transmission bandwidth less than the predetermined number.
- the reference sequence length N b for the transmission bandwidth less than the predetermined number, and the reference sequence number q b are a sequence length corresponding to a transmission bandwidth adjacent to the transmission bandwidth, and , The sequence number of the group number u in the adjacent transmission bandwidth.
- the sequence length corresponding to each of the transmission bandwidths greater than or equal to the predetermined number is N rb
- the sequence number of the group number u is q rb
- the transmission bandwidths less than the predetermined number With respect to the sequence length N, the first sequence of the sequence number q having the smallest absolute value of the difference between the average value of q rb / N rb and the q / N in each transmission bandwidth of the predetermined number or more is
- the generation means generates the reference signal using any one of the grouped first sequences when the cooperative reception is applied.
- the generation unit converts a part of the first sequence having a sequence length according to the transmission bandwidth. By deleting, the reference signal of the transmission bandwidth is generated.
- the generation unit generates the reference signal using a sequence group hopping pattern different from a sequence group hopping pattern used when the coordinated reception is not applied when the coordinated reception is applied. To do.
- the first sequence is a Zadoff-Chu sequence
- the second sequence is a Computer generated sequence
- the reference signal is a data demodulation reference signal (Demodulated Reference Signal).
- the present invention can be applied to a mobile communication system or the like.
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Abstract
Description
[通信システムの概要]
本発明の実施の形態1に係る通信システムは、送信装置と受信装置とを有する。特に、本実施の形態では、送信装置を端末100とし、受信装置を基地局200として説明する。この通信システムは、例えば、LTE-Advancedシステムである。そして、端末100は、例えば、LTE-Advancedシステムに対応する端末であり、基地局200は、例えば、LTE-Advancedシステムに対応する基地局である。また、例えば、端末100がUL CoMP端末として動作する場合、端末100から送信された信号は、複数の基地局200によって協調して受信される。
図9は、本実施の形態に係る端末100の構成を示すブロック図である。また、図10は、端末100におけるDM-RSの符号系列(DM-RS系列)の生成処理を示すフロー図である。
図11は、本実施の形態に係る基地局200の構成を示すブロック図である。
以上の構成を有する端末100及び基地局200の動作について説明する。
生成例1では、送信帯域幅3RBに割り当てられているグループ番号uにおけるZC系列の系列番号qbと送信帯域幅3RBに応じた系列長Nbとの比であるqb/Nbの値と、1,2RB用のZC系列の系列番号qと系列長Nとの比であるq/Nの値と、が最も近くなる系列番号qが、グループ番号uにおける、UL CoMP端末(UE固有系列が割り当てられる端末)の1,2RB用のZC系列番号として割り当てられる。つまり、qb/Nbとq/Nとの差の絶対値が最も小さい系列番号qのZC系列が、グループ番号uの系列グループに含まれる。
生成例2では、UL CoMP端末(UE固有系列が割り当てられる端末)の1,2RB用のZC系列番号として各系列グループに割り当てられるZC系列番号の使用回数の差を最大で1とする。
生成例3では、UL CoMP端末(UE固有系列が割り当てられる端末)の1,2RB用のZC系列番号の割当の際、1,2RB用のZC系列の系列番号qと系列長Nとの比であるq/Nの値に対して基準となるqb/Nbの値に対応する送信帯域幅を、1RBと2RBとで異ならせる。
生成例4では、UL CoMP端末(UE固有系列が割り当てられる端末)の1,2RB用のZC系列番号の割当の際、3RB以上の送信帯域幅(3RB~110RB)のそれぞれにおけるZC系列n系列番号qrbと系列長Nrbとの比であるqrb/Nrbの平均値を、1,2RB用のZC系列の系列番号qと系列長Nとの比であるq/Nの値に対する基準とする。
実施の形態1では、送信帯域幅1,2のZC系列を設定する際、3RB以上のDM-RS用のZC系列と同様、ZC系列の系列長は、送信帯域幅(RB数)に相当するサブキャリア数以内の最大の素数とした。よって、DM-RSのサイズより小さいZC系列の先頭部分を末尾にコピー(Extension)した系列が使用される(例えば、図19A参照)。
本実施の形態では、CoMPが適用される端末に対する系列グループホッピングを、CoMPが適用されない端末に対する系列グループホッピングと異ならせる。
200,400 基地局
101,201 送信帯域幅設定部
102,202 CoMPモード設定部
103,203 系列生成部
104,204 系列切替部
105,205 ZC系列番号テーブル
106,206 系列情報算出部
107,207 ZC系列生成部
108,208 CG系列生成部
109 マッピング部
110,216,222 IFFT部
111 CP付加部
112 送信部
113,209 アンテナ
210 受信部
211 CP除去部
212 分離部
213,219 FFT部
214,220 デマッピング部
215 除算部
217 マスク処理部
218 DFT部
221 周波数領域等化部
223 復調部
224 復号部
301,401 系列グループホッピング制御部
Claims (11)
- 複数の受信装置による協調受信が適用される場合、所定数未満の送信帯域幅の参照信号を、前記所定数以上の送信帯域幅の参照信号に用いられる第1の系列を用いて生成し、前記協調受信が適用されない場合、前記所定数未満の送信帯域幅の参照信号を、前記第1の系列と異なる第2の系列を用いて生成する生成手段と、
前記参照信号を送信する送信手段と、
を具備する送信装置。 - 基準系列長をNbとし、グループ番号uの基準系列番号をqbとし、複数の送信帯域幅のそれぞれに応じた系列長Nに対して、qb/Nbとq/Nとの差の絶対値が最も小さい系列番号qの前記第1の系列が、グループ番号uのグループにグループ化され、
前記生成手段は、前記協調受信が適用される場合に、グループ化された前記第1の系列のいずれか一つを用いて前記参照信号を生成する、
請求項1記載の送信装置。 - 前記所定数未満の送信帯域幅に対する前記基準系列長Nb及び前記基準系列番号qbは、前記所定数以上の送信帯域幅に対する基準系列長及び基準系列番号と同一である、
請求項2記載の送信装置。 - 前記所定数未満の送信帯域幅において、異なる系列番号の前記第1の系列間で、各系列番号が使用されるグループ数の差は1以内である、
請求項2記載の送信装置。 - 前記所定数未満の送信帯域幅に対する前記基準系列長Nb、及び、前記基準系列番号qbは、当該送信帯域幅に隣接する送信帯域幅に応じた系列長、及び、前記隣接する送信帯域幅における前記グループ番号uの系列番号である、
請求項2記載の送信装置。 - 前記所定数以上の送信帯域幅のそれぞれに応じた、系列長をNrbとし、グループ番号uの系列番号をqrbとし、前記所定数未満の送信帯域幅にそれぞれ応じた系列長Nに対して、前記所定数以上の各送信帯域幅におけるqrb/Nrbの平均値と、q/Nとの差の絶対値が最も小さい系列番号qの前記第1の系列が、グループ番号uのグループにグループ化され、
前記生成手段は、前記協調受信が適用される場合、グループ化された前記第1の系列のいずれか一つを用いて前記参照信号を生成する、
請求項1記載の送信装置。 - 前記生成手段は、前記協調受信が適用され、かつ送信帯域幅が前記所定数未満の場合、当該送信帯域幅に応じた系列長の前記第1の系列の一部を削除することにより、当該送信帯域幅の前記参照信号を生成する、
請求項1記載の送信装置。 - 前記生成手段は、前記協調受信が適用される場合、前記協調受信が適用されない場合に用いられる系列グループホッピングパターンと異なる系列グループホッピングパターンを用いて、前記参照信号を生成する、
請求項1記載の送信装置。 - 前記第1の系列はZadoff-Chu系列であり、前記第2の系列はComputer generated系列である、
請求項1記載の送信装置。 - 前記参照信号は、データ復調用参照信号(Demodulated Reference Signal)である、
請求項1記載の送信装置。 - 複数の受信装置による協調受信が適用される場合、所定数未満の送信帯域幅の参照信号を、前記所定数以上の送信帯域幅の参照信号に用いられる第1の系列を用いて生成し、前記協調受信が適用されない場合、前記所定数未満の送信帯域幅の参照信号を、前記第1の系列と異なる第2の系列を用いて生成し、
前記参照信号を送信する、
送信方法。
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