WO2011126025A1 - 基地局装置、移動局装置及び参照信号送信方法 - Google Patents
基地局装置、移動局装置及び参照信号送信方法 Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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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
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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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
- H04L5/0078—Timing of allocation
- H04L5/0082—Timing of allocation at predetermined intervals
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- H04W52/04—TPC
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- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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Definitions
- the present invention relates to a base station apparatus, a mobile station apparatus, and a reference signal transmission method, and more particularly to a base station apparatus, a mobile station apparatus, and a reference signal transmission method in a next-generation mobile communication system.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE-A LTE Advanced
- LTE-A LTE Advanced
- CRS Common Reference Signal
- CQI downlink channel quality
- CSI-RS Channel State Information-Reference Signal
- This CSI-RS supports CQI measurement of a plurality of cells in consideration of transmission / reception of data channel signals by multi-point cooperation (CoMP: Coordinated Multiple Point).
- CSI-RS is different from CRS used for CQI measurement of only a serving cell in that it is used for CQI measurement of a neighboring cell.
- the user terminal UE When performing CQI measurement of multiple cells using CSI-RS, the user terminal UE needs to receive a broadcast signal not only from the serving cell but also from neighboring cells in order to recognize parameters such as transmission power. .
- a broadcast signal from an adjacent cell there is a problem that processing in the user terminal UE is complicated, for example, it is necessary to interrupt signal reception from the serving cell.
- the present invention has been made in view of such circumstances, and a base station device, a mobile station device, and a reference signal transmission method capable of measuring CQI of an adjacent cell without complicating the processing of the user terminal UE
- the purpose is to provide.
- the base station apparatus of the present invention includes: an acquisition unit configured to acquire a cell ID of the adjacent cell, a position of CSI-RS, and transmission power as parameters related to CSI (Channel State Information) -RS of the adjacent cell; and a signal including the parameter. It comprises generation means for generating, and transmission means for transmitting the generated signal in the downlink.
- the CSI-RS is not received at the user terminal without receiving the broadcast signal from the neighboring cell. Therefore, it is possible to cause the user terminal to perform CQI measurement of the adjacent cell without requiring complicated processing such as interruption of signal reception from the serving cell.
- the mobile station apparatus of the present invention includes a receiving unit that receives a signal including a cell ID of the neighboring cell, a CSI-RS position, and transmission power as a parameter related to CSI-RS of the neighboring cell from a serving cell, and is included in the received signal.
- Measuring means for specifying a CSI-RS based on a cell ID of the adjacent cell, a position of CSI-RS, and transmission power, and measuring a propagation path state of the adjacent cell.
- a signal including the cell ID of the neighboring cell, the position of the CSI-RS, and the transmission power is received from the serving cell, and the CSI ⁇ based on the cell ID of the neighboring cell, the position of the CSI-RS, and the transmission power is received. Since the RS is specified and the CQI of the neighboring cell is measured, the CSI-RS can be identified without receiving the broadcast signal from the neighboring cell, so that complicated processing such as interrupting signal reception from the serving cell It is possible to measure the CQI of a neighboring cell without needing.
- the cell ID of the neighboring cell, the position of the CSI-RS, and the transmission power are obtained as parameters relating to the CSI-RS of the neighboring cell;
- the method includes a step of generating a signal including parameters, and a step of transmitting the generated signal in a downlink.
- the CSI can be received without receiving the broadcast signal from the neighboring cell at the user terminal.
- the RS can be specified, it is possible to perform CQI measurement of the neighboring cell in the user terminal without requiring complicated processing such as interruption of signal reception from the serving cell.
- the CSI since a signal including the cell ID of the neighboring cell, the position of the CSI-RS, and the transmission power is transmitted from the serving cell to the user terminal, the CSI can be received without receiving the broadcast signal from the neighboring cell at the user terminal. -Since the RS can be specified, it is possible to perform CQI measurement of the neighboring cell in the user terminal without requiring complicated processing such as interruption of signal reception from the serving cell.
- FIG. 1 It is a figure which shows the structure of CSI-RS to which the reference signal transmission method which concerns on the 3rd aspect of this invention is applied. It is a block diagram which shows the structure of the base station apparatus with which the reference signal transmission method which concerns on this invention is applied. It is a block diagram which shows the structure of the mobile station apparatus which receives CSI-RS transmitted with the reference signal transmission method which concerns on this invention.
- CRS Common Reference Signal
- CSI-RS considered to be defined in the downlink of the LTE-A system
- Channel State Information-Reference Signal Channel State Information-Reference Signal
- FIG. 1 is a diagram for explaining the configuration of the CRS.
- FIG. 1 shows a configuration of CRS when base station apparatus eNodeB includes four transmission antennas.
- FIGS. 1A and 1B show CRSs in one resource block (RB) of cell 1 and cell 2 adjacent to each other, respectively. The structure of is shown.
- the vertical axis represents frequency and the horizontal axis represents time. Note that the CRS is allocated to all resource blocks and all subframes.
- the CRS is transmitted to the user terminal UE as a common cell reference signal with a known transmission power and phase from a frequency and time known to the user terminal UE.
- the frequency and transmission power of these CRSs are recognized by the user terminal UE by a cell ID and a broadcast signal described later.
- the CRS is generally used for data channel signal demodulation and downlink channel measurement in the user terminal UE.
- the number and position of CRS symbols are determined from the viewpoint of channel estimation accuracy and overhead.
- the CRS for the first and second transmission antennas is mapped to the first and fifth OFDM symbols in each time slot every 6 subcarriers for each transmission antenna.
- the CRSs for the third, fourth, and second transmission antennas are mapped to the same subcarrier as the first and second transmission antennas, respectively, only in the second OFDM symbol in the time slot.
- CRSs are multiplexed by shifting the position of subcarriers for each cell so that CRSs between cells do not interfere with each other.
- This CRS is specified by parameters such as position, sequence, and transmission power.
- the position of the CRS is associated with the cell ID. That is, the position where the CRS is shifted in the frequency direction is determined by the cell ID, and the user terminal UE can identify the position of the CRS by recognizing the cell ID.
- the CRS sequence is associated with the cell ID. That is, the CRS modulation method to be used is determined by the cell ID, and the user terminal UE can identify the CRS sequence by recognizing the cell ID.
- the transmission power of CRS is specified according to the notification signal notified in each cell. That is, the CRS transmission power is designated in the broadcast signal, and the user terminal UE can identify the CRS transmission power by recognizing information in the broadcast signal.
- the cell ID referred to for specifying the position and sequence of the CRS is recognized by the user terminal UE performing a cell search. For this reason, in the user terminal UE, the location and sequence of the CRS can be specified in each cell by the cell ID acquired by the cell search. That is, in the user terminal UE, parameters other than the transmission power of CRS can be specified without receiving a control signal (broadcast signal).
- FIG. 2 is a diagram for describing information fed back from the user terminal UE to the serving cell and the base station apparatus eNodeB of the neighboring cell in the LTE system.
- Channel measurement using CRS includes estimation of an average downlink channel state for cell search and handover (mobility measurement), and downlink channel quality (CQI: Channel Quality for scheduling and adaptive control). Indicator) measurement.
- the mobility measurement is currently performed on the serving cell to which the user terminal UE is actually connected and the neighboring cell adjacent to this serving cell.
- the mobility measurement when only the received power of CRS is measured, if the CRS position and sequence of the cell to be measured (serving cell and neighboring cell) can be identified, the measurement is performed without requiring a control signal (broadcast signal). can do.
- CRS received signal power RSRP: Reference Signal Received Power
- RSRQ Reference Signal Received Quality
- the RSRP and the like measured by the user terminal UE are fed back to the base station device eNodeB # 1 installed in the serving cell and the base station devices eNodeB # 2 and # 3 installed in the adjacent cells.
- the fed back RSRP or the like is used for determination or the like when the user terminal UE is handed over.
- CQI measurement is performed only for the serving cell that is the source of the data channel signal.
- CQI measurement measurement can be performed if the CRS position, sequence, and transmission power of a cell (serving cell) to be measured can be specified.
- CQI, RI (Rank Indicator), and PMI Precoding Matrix Indicator
- the CQI or the like measured by the user terminal UE is fed back to the base station apparatus eNodeB # 1 installed in the serving cell as shown in FIG.
- the fed back CQI or the like is used for determination of a parameter (for example, MCS: Modulation and Coding Scheme) when transmitting a data channel signal to the user terminal UE.
- MCS Modulation and Coding Scheme
- the user terminal UE when the user terminal UE performs channel measurement of an adjacent cell in the CRS of the LTE system, only the cell ID needs to be specified. Since the cell ID can be specified by a cell search, no signaling (broadcast signal) is required for channel measurement in adjacent cells. That is, in the CRS of the LTE system, signaling necessary for the user terminal UE is limited to the transmission power of the CRS in the serving cell.
- FIG. 3 is a diagram for explaining the configuration of the CSI-RS.
- FIG. 3A it is a figure for demonstrating the structure of the sub-frame to which CSI-RS is allocated.
- FIG. 3B illustrates a configuration of CSI-RS in one resource block (RB) when the base station apparatus eNodeB includes four transmission antennas.
- RB resource block
- FIG. 3B for convenience of explanation, CSI-RSs for adjacent cells 1 and 2 are shown in the same resource block. 3B shows the CRS shown in FIG. 1 for convenience of explanation.
- CSI-RS is not assigned to all resource blocks and all subframes, but is assigned to subframes at a fixed period as shown in FIG. 3A. Also, a predetermined number of subframes can be shifted from other cells and assigned by subframe offset.
- FIG. 3A shows a case where CSI-RSs are allocated in 10 subframe periods in cell 1 and cell 2, and cell 3 is allocated with an offset of 2 subframes from CSI-RS in cell 1 and cell 2. Shows the case.
- CSI-RS is specified by parameters such as position, sequence, and transmission power, similar to CRS.
- the position of the CSI-RS is specified, for example, according to a broadcast signal (SIB2) notified in each cell. That is, the CSI-RS subframe offset amount, period, and subcarrier-symbol offset amount are specified in the broadcast signal, and the user terminal UE recognizes information in the broadcast signal to recognize the position of the CSI-RS.
- SIB2 broadcast signal
- the CSI-RS sequence is associated with a cell ID. That is, the CSI-RS modulation scheme to be used is determined by the cell ID, and the user terminal UE can identify the CSI-RS sequence by recognizing the cell ID.
- the transmission power of CSI-RS is specified according to the broadcast signal (SIB2) notified in each cell. That is, the CSI-RS transmission power is specified in the broadcast signal, and the user terminal UE can identify the CSI-RS transmission power by recognizing information in the broadcast signal. In addition, the parameter regarding CSI-RS can also be notified using the control signal for each user terminal UE.
- SIB2 broadcast signal
- FIG. 3B shows a case where the CSI-RS corresponding to cell 1 is subcarrier-symbol offset and mapped to the sixth OFDM symbol. More specifically, the subcarrier is offset by 2 subcarriers and 5 OFDM symbols, and the CSI-RS for the first and third transmit antennas is mapped to the same subcarrier as the second transmit antenna of the CRS. The CSI-RS for the fourth transmission antenna is mapped to subcarriers adjacent to the CSI-RS of the first and third transmission antennas.
- FIG. 3B shows a case where the CSI-RS corresponding to cell 2 is not subcarrier-symbol offset and mapped to the 11th OFDM symbol.
- FIG. 4 is a diagram for explaining information fed back from the user terminal UE to the serving cell and the base station apparatus eNodeB of the neighboring cell in the LTE-A system.
- Channel measurement using CSI-RS includes downlink CQI measurement for scheduling and adaptive control. Unlike CQI measurement using CRS, CQI measurement using CSI-RS is performed not only for the serving cell but also for neighboring cells. The reason why the channel quality of a plurality of cells is measured in this way is to consider transmission / reception of data channel signals by multi-point coordination (CoMP: Coordinated Multiple Point).
- CoMP Coordinated Multiple Point
- CQI is measured in the same manner as CQI measurement using CRS, and RI and PMI are determined based on the measured CQI.
- CQI measured by the user terminal UE is fed back to the base station apparatus eNodeB # 1 installed in the serving cell and the base station apparatus eNodeB # 2 installed in the adjacent cell.
- the fed back CQI or the like is used for determining a parameter (for example, MCS) when transmitting a data channel signal to the user terminal UE.
- CSI-RS parameters (hereinafter referred to as “CSI-RS parameters”) are communicated between cells, and the CSI-RS parameters of neighboring cells are transmitted from the serving cell to the user. It is transmitted to the terminal UE. More specifically, CSI-RS parameters not associated with a cell ID are communicated between cells, a broadcast signal including these CSI-RS parameters of neighboring cells is generated, and the broadcast signal is transmitted from the serving cell to the user terminal UE. Send to.
- a broadcast signal may be used, or a signal specific to the user terminal UE may be used.
- FIG. 5 is a diagram for explaining information communicated between the base station apparatus eNodeB and the user terminal UE in the mobile communication system to which the reference signal transmission method according to the first aspect of the present invention is applied.
- the base station apparatus eNodeB # 1 installed in the serving cell is connected to the base station apparatuses eNodeB # 2 and # 3 installed in the adjacent cells so as to be able to transmit and receive CSI-RS parameters.
- the connection form between these base station apparatuses eNodeB # 1 and base station apparatuses eNodeB # 2 and # 3 is not particularly limited, and may be either wired connection or wireless connection.
- FIG. 5 shows a case where CSI-RS parameters are exchanged between base station apparatus eNodeB # 1 and base station apparatus eNodeB # 2.
- a CSI-RS parameter that is not associated with the cell ID of the base station apparatus eNodeB # 2 is transmitted to the base station apparatus eNodeB # 1.
- the base station device eNodeB # 1 generates a broadcast signal including the CSI-RS parameter received from the base station device eNodeB # 2 and the CSI-RS parameter not associated with the cell ID of the base station device eNodeB # 2, and sends it to the user terminal UE. Send.
- This broadcast signal includes the CSI-RS position (subframe offset amount, subcarrier-symbol offset amount, period) and transmission power as CSI-RS parameters of the serving cell.
- a CSI parameter of an adjacent cell a cell ID for identifying the adjacent cell (adjacent cell ID) and a CSI-RS position (subframe offset amount, subcarrier-symbol offset amount, Period) and transmission power.
- the CSI-RS sequence of the neighboring cell can be specified from the cell ID designated by the broadcast signal from the serving cell, and the CSI-RS position (subframe offset) of the neighboring cell designated by the broadcast signal can be specified. Amount, subcarrier-symbol offset amount, period) and transmission power can be specified, and the CSI-RS can be specified from these.
- CQI measurement can be performed, without receiving the alerting signal from an adjacent cell. As shown in FIG. 5, the CQI and the like measured by the user terminal UE are fed back to the base station apparatus eNodeB # 2 specified by the neighboring cell ID.
- the CSI-RS sequence associated with the cell ID acquired by the cell search and the CSI-RS position (subframe offset amount, subcarrier-symbol specified by the broadcast signal) (Offset amount, period) and transmission power.
- the CQI or the like measured by the user terminal UE is fed back to the base station apparatus eNodeB # 1, as shown in FIG.
- the broadcast signal including the CSI-RS parameter of the neighboring cell is transmitted from the serving cell to the user terminal UE.
- the CSI-RS sequence can be specified from the specified cell ID, and the CSI-RS position (subframe offset amount, subcarrier-symbol offset amount, period) and transmission power of the adjacent cell specified by this broadcast signal can be determined. Since the CSI-RS can be specified from these, the user terminal UE can perform CQI measurement without receiving a broadcast signal from a neighboring cell. As a result, it becomes possible to perform the CQI measurement of the adjacent cell without complicating the process of the user terminal UE.
- FIG. 6 is a diagram for explaining muting in channel quality measurement using CSI-RS.
- 6A shows the configuration of the CSI-RS of adjacent cells 1 and 2 in a state where muting is not performed
- FIG. 6B shows the CSI of the adjacent cells 1 and 2 in a state where muting is performed.
- FIG. 6 shows a case where CSI-RS is mapped as in FIG. 3B.
- a data channel signal is assigned to the resource element of cell 1 corresponding to the CSI-RS resource element of cell 2.
- a data channel signal is allocated to the resource element of cell 2 corresponding to the CSI-RS resource element of cell 1.
- Each of these data data channel signals constitutes an interference component of CSI-RS and becomes a factor that degrades the estimation accuracy of the channel quality in the user terminal UE.
- muting in order to prevent deterioration in estimation accuracy of channel quality due to such data channel signal allocation, data channel signals are not allocated to resource elements corresponding to CSI-RS resource elements of neighboring cells, The resource element is null.
- a data channel signal is not allocated to the resource element of cell 1 corresponding to the CSI-RS resource element of cell 2, and the resource element is set to null.
- a data channel signal is not allocated to the resource element of cell 2 corresponding to the CSI-RS resource element of cell 1, and the resource element is set to null.
- the data channel signal of the adjacent cell can be excluded from the interference component of CSI-RS, and the channel quality estimation accuracy in the user terminal UE can be improved. Can be improved.
- muting on / off or a cycle is included in the CSI-RS parameter notified to the user terminal UE by a broadcast signal. .
- the user terminal UE can recognize the presence or absence of muting, by estimating the CQI in consideration of the interference component of the resource element that has been muted. It is possible to estimate the CQI corresponding to the actual CQI.
- the CSI-RS position and transmission power of the cells 1 and 2 can be specified from the CSI-RS parameters specified by the broadcast signal, so that other cells that are null by muting The signal power of the resource element can be specified. For this reason, the CQI conforming to the actual CQI can be estimated by using the transmission power of the resource element for the CQI calculation during CQI measurement.
- CQI cell1 in the cell 1 is calculated by (Equation 1).
- S cell1 indicates the CSI-RS transmission power of cell 1
- S cell2 indicates the signal power of the resource element of cell 2 that is nulled by muting.
- N indicates noise. That is, in the user terminal UE, the signal power of the resource element of the cell 2 that is nulled by muting is put in the denominator of the arithmetic expression of the CQI cell1 . Thereby, CQI cell1 according to actual CQI can be estimated.
- CQI cell2 in the cell 2 is calculated by (Equation 2).
- the CQI cell 1 is calculated by (Equation 3). That is, since the corresponding resource element is null, only the noise N remains in the denominator of the CQI arithmetic expression, and as a result, CQI cell1 is overestimated. Similarly, if the resource elements of the cell 1 corresponding to the CSI-RS resource elements of the cell 2 is a null by muting, CQI cell2 is calculated by (Equation 4), CQI cell2 is overestimated Will be. (Formula 3) (Formula 4)
- the muting on / off or period is notified by the CSI-RS parameter included in the broadcast signal. Can recognize whether or not Thereby, in the user terminal UE, it is possible to estimate the CQI according to the actual CQI by estimating the CQI in consideration of the interference component of the resource element subjected to muting.
- the on / off or cycle of muting can be grasped only by the serving cell, and therefore can be included in the CSI-RS parameter of the serving cell. Further, it may be included in the CSI-RS parameter of the neighboring cell in accordance with communication of information regarding muting with the neighboring cell.
- the transmission power in a resource element that is null is set to 0, in the OFDM symbol including this resource element, all the power allocated to the OFDM symbol is not used.
- the power offset amount is included in the CSI-RS parameter notified to the user terminal UE by the broadcast signal. In this way, when the power offset amount is included, CQI measurement can be performed using CSI-RS in which power is amplified in the user terminal UE, so that the CQI estimation accuracy can be improved.
- FIG. 7 is a diagram showing a configuration of a CSI-RS to which the reference signal transmission method according to the third aspect of the present invention is applied.
- FIG. 7 shows a case where CSI-RSs of adjacent cells 1 and 2 are mapped to the same OFDM symbol.
- the resource element of cell 1 corresponding to the CSI-RS resource element of cell 2 is null
- the resource element of cell 2 corresponding to the CSI-RS resource element of cell 1 is null. It shows about the case.
- the transmission power of resource elements that are null in cell 1 is redistributed and amplified to CSI-RS resource elements, and the user terminal UE is notified by a broadcast signal.
- the power offset amount is included in the CSI-RS parameter notified to.
- the user terminal UE can perform CQI measurement using the CSI-RS with the amplified power after recognizing the amplified portion of the CSI-RS. It becomes possible to improve.
- the transmission power of the resource element that is null in cell 2 is redistributed to the CSI-RS resource element and amplified, it is included in the CSI-RS parameter that is notified to the user terminal UE by a broadcast signal, Since the user terminal UE can perform CQI measurement using the CSI-RS with amplified transmission power after recognizing the amplified portion of the CSI-RS, the CQI estimation accuracy can be improved. Become.
- the transmission power of the resource element that is null is set to CSI-RS. Since the user terminal UE is notified by a broadcast signal of the power offset amount amplified by the transmission power of the resource element that is made null and redistributed to the resource elements, the CSI ⁇ Since CQI measurement can be performed using RS, it is possible to improve CQI estimation accuracy.
- the power offset amount can be grasped only by the serving cell, it can be included in the CSI-RS parameter of the serving cell. Further, it may be included in the CSI-RS parameter of the neighboring cell in accordance with communication of information regarding muting with the neighboring cell.
- the subframe offset amount and the subcarrier-symbol offset amount of CSI-RS are not limited to the case where they are specified by a broadcast signal, and can be associated with a cell ID.
- the subframe offset amount and the subcarrier-symbol offset amount of CSI-RS are not limited to the case where they are specified by a broadcast signal, and can be associated with a cell ID.
- the user terminal UE it is possible to identify some information regarding the position of the CSI-RS by recognizing the cell ID.
- the information amount notified by the broadcast signal can be reduced.
- FIG. 8 is a block diagram showing a configuration of base station apparatus 10 to which the reference signal transmission method according to the present invention is applied.
- FIG. 9 is a block diagram showing a configuration of mobile station apparatus 20 that receives CSI-RS transmitted by the reference signal transmission method according to the present invention. Note that the configurations of the base station apparatus 10 shown in FIG. 8 and the mobile station apparatus 20 shown in FIG. 9 are simplified to explain the present invention, and the configurations of the normal base station apparatus and mobile station apparatus are as follows. Shall be provided.
- the base station apparatus 10 includes a CSI-RS parameter transmission / reception unit 11 that transmits / receives CSI-RS parameters to / from other base station apparatuses installed in adjacent cells, and a CSI-RS parameter transmission / reception unit. 11, a broadcast signal generator 12 that generates a broadcast signal including the CSI-RS parameter of the adjacent cell received by channel 11, channel coding of the broadcast signal and data channel signal generated by the broadcast signal generator 12, and OFDM symbols and sub It includes a baseband signal processing unit 13 that performs mapping to a frame and generates an OFDM signal.
- the CSI-RS parameter transmission / reception unit 11 constitutes acquisition means, acquires CSI-RS parameters not associated with the cell ID from other base station apparatuses installed in adjacent cells, and this CSI-RS.
- the parameter is output to the notification signal generator 12.
- the CSI-RS parameter transmission / reception unit 11 outputs the CSI-RS parameter not associated with the cell ID in the cell (serving cell) in which the device itself is installed and other system parameters to the notification signal generation unit 12.
- Other system parameters include, for example, uplink bandwidth.
- the neighboring cell ID As the CSI-RS parameter of the neighboring cell, the neighboring cell ID, the position of the CSI-RS in the neighboring cell (subframe offset amount, subcarrier-symbol offset amount, period) and transmission Receive power.
- the notification signal generator 12 constitutes a generation means, and generates a notification signal based on the CSI-RS parameter of the neighboring cell, the CSI-RS parameter of the serving cell, and other system parameters.
- the broadcast signal generator 12 generates a broadcast signal including the CSI-RS position (subframe offset amount, subcarrier-symbol offset amount, period) and transmission power in the adjacent cell (according to the first aspect) Reference signal transmission method).
- a notification signal including muting on / off or a cycle is generated (reference signal transmission method according to the second mode).
- a broadcast signal including a power offset amount for the CSI-RS amplified by the transmission power of the resource element that is nulled by muting is generated (reference signal transmission according to the third aspect) Method).
- a notification signal including muting on / off or a power offset is generated in response to an instruction from an upper layer, for example.
- the notification signal generated by the notification signal generation unit 12 is input to the baseband signal processing unit 13.
- the baseband signal processing unit 13 includes a CSI-RS generated by a reference signal generation unit (not shown), a data channel signal (data signal) instructed by a higher station apparatus, a control channel signal (control signal), and A pilot signal is input.
- various signals including the broadcast signal are channel coded by the channel coding unit 131, mapped to OFDM symbols and subframes by the mapping unit 132, and then OFDM signal generated by the OFDM signal generation unit 133. Is modulated.
- the muting described above is realized by making the corresponding resource element null by the mapping unit 132.
- the power offset described above is realized by controlling the transmission power of the corresponding resource element.
- the baseband signal generated by the baseband signal processing unit 13 is subjected to frequency conversion processing for conversion into a radio frequency band by a transmission / reception unit (not shown), and then transmitted to the mobile station apparatus 20 on the downlink via the transmission antenna TX. Is done.
- the baseband signal processing unit 13, the transmission / reception unit, and the transmission antenna TX constitute transmission means.
- the neighboring cell ID as the CSI-RS parameter of the neighboring cell, the position of CSI-RS in the neighboring cell (subframe offset amount, subcarrier-symbol offset amount, period ) And transmission power, and a broadcast signal including these CSI-RS parameters is generated and transmitted to the mobile station device 20, so that the mobile station device 20 receives the broadcast signal of the adjacent cell. Since the CSI-RS of the neighboring cell can be specified without performing the mobile station, the mobile station apparatus 20 can measure the CQI of the neighboring cell without requiring complicated processing such as interruption of signal reception from the serving cell. Can be performed.
- a notification signal including on / off or period of muting is generated, and this notification signal is transmitted to mobile station apparatus 20, so that the mobile station The device 20 can recognize the presence or absence of muting, and can estimate the channel quality in consideration of the interference component of the resource element that has been muted.
- base station apparatus 10 when CSI-RSs of neighboring cells are multiplexed on the same OFDM symbol, the power of resource elements that are null due to muting is re-transmitted to CSI-RS. Since the mobile station apparatus 20 is notified of the power offset amount for the CSI-RS amplified by the transmission power of the resource element, which is distributed and amplified by the muting, by the notification signal, the mobile station apparatus 20 is distributed.
- the CQI measurement can be performed using the CSI-RS in which the transmission power is amplified.
- the mobile station apparatus 20 includes an OFDM signal processing unit 21 that performs demodulation processing, demapping, and decoding processing on an OFDM signal received via the reception antenna RX, and an OFDM signal processing unit 21. And a CQI measurement unit 22 that measures channel quality (CQI) based on the CSI-RS parameters of the serving cell and the neighboring cell received in step S1.
- an OFDM signal processing unit 21 that performs demodulation processing, demapping, and decoding processing on an OFDM signal received via the reception antenna RX
- an OFDM signal processing unit 21 includes an OFDM signal processing unit 21 that performs demodulation processing, demapping, and decoding processing on an OFDM signal received via the reception antenna RX, and an OFDM signal processing unit 21.
- a CQI measurement unit 22 that measures channel quality (CQI) based on the CSI-RS parameters of the serving cell and the neighboring cell received in step S1.
- the OFDM signal received via the reception antenna RX is demodulated by the OFDM signal demodulation unit 211, demapped by the demapping unit 212, and then decoded by the decoding unit 213.
- the CSI-RS parameters of the serving cell and the neighboring cell are output to the CQI measurement unit 22, and other system parameters and dedicated data channel signals (dedicated data) are stored in the upper layer. Is output.
- the receiving antenna RX and the OFDM signal processing unit 21 constitute a receiving means.
- the CQI measurement unit 22 constitutes a measurement unit, specifies CSI-RSs of the serving cell and the neighboring cell based on the CSI-RS parameters of the serving cell and the neighboring cell, and performs CQI measurement.
- the CQI measurement unit 22 can specify the CSI-RS sequence from the cell ID specified by the broadcast signal from the serving cell, and can also determine the position (subframe) of the CSI-RS of the adjacent cell specified by this broadcast signal. Since the offset amount, subcarrier-symbol offset amount, period) and transmission power can be specified, the CSI-RS is specified from these (reference signal transmission method according to the first mode).
- the mobile station apparatus 20 since the mobile station apparatus 20 according to the present embodiment receives the broadcast signal including the CSI-RS parameter of the adjacent cell from the base station apparatus 10 installed in the serving cell,
- the CSI-RS sequence can be specified from the specified cell ID, and the CSI-RS position (subframe offset amount, subcarrier-symbol offset amount, period) and transmission power of the adjacent cell specified by this broadcast signal can be determined. Since the CSI-RS can be specified without receiving a broadcast signal from the neighboring cell, it is possible to identify the neighboring cell without requiring complicated processing such as interrupting signal reception from the serving cell. It becomes possible to measure CQI.
- the mobile station device 20 when a notification signal including muting on / off or a period is received, an interference component of a resource element that is nulled by muting is estimated. Since the CQI of the serving cell and the neighboring cell is measured, it is possible to avoid the situation where the interference component of the neighboring cell is eliminated by muting, and it is possible to estimate the CQI corresponding to the actual channel quality. .
- the base station apparatus 10 installed in the serving cell generates a broadcast signal including the CSI-RS parameter of the adjacent cell, and the mobile station apparatus 20 Therefore, the CSI-RS sequence can be specified from the cell ID specified by the broadcast signal, and the CSI-RS position (subframe offset amount) of the adjacent cell specified by the broadcast signal can be specified. , Subcarrier-symbol offset amount, period) and transmission power can be specified, and CSI-RS of an adjacent cell can be specified without receiving a broadcast signal from the adjacent cell. It is possible to perform CQI measurement of adjacent cells in the mobile station device 20 without requiring complicated processing such as interruption of To become.
- the base station device 10 installed in the serving cell generates a notification signal including the CSI-RS parameter of the adjacent cell and transmits the signal to the mobile station device 20.
- the signal including the CSI-RS parameter is not limited to the broadcast signal.
- the base station apparatus 10 installed in the serving cell may generate a control signal including the CSI-RS parameter of the adjacent cell and transmit it to the mobile station apparatus 20.
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Abstract
Description
(式1)
(式2)
(式3)
(式4)
Claims (9)
- 隣接セルのCSI(Channel State Information)-RSに関するパラメータとして前記隣接セルのセルID、CSI-RSの位置及び送信電力を取得する取得手段と、前記パラメータを含む信号を生成する生成手段と、前記生成した信号を下りリンクで送信する送信手段とを具備することを特徴とする基地局装置。
- 前記生成手段は、前記パラメータとして、前記隣接セルのCSI-RSがマッピングされるリソースエレメントに対応するリソースエレメントをヌルとするミューティングのオン/オフ又は周期を含む信号を生成することを特徴とする請求項1記載の基地局装置。
- 前記生成手段は、前記パラメータとして、前記ミューティングによりヌルとされるリソースエレメントの送信電力だけ増幅したCSI-RSに対する送信電力のオフセット量を含む信号を生成することを特徴とする請求項2記載の基地局装置。
- サービングセルから隣接セルのCSI-RSに関するパラメータとして前記隣接セルのセルID、CSI-RSの位置及び送信電力を含む信号を受信する受信手段と、前記受信した信号に含まれる前記隣接セルのセルID又はCSI-RSの位置及び送信電力に基づいてCSI-RSを特定して前記隣接セルの伝播路状態を測定する測定手段とを具備することを特徴とする移動局装置。
- 前記測定手段は、前記セルIDに関連付けられたCSI-RSの系列と、前記受信した信号に含まれる前記CSI-RSの位置及び送信電力とからCSI-RSを特定して前記隣接セルの伝搬路状態を測定することを特徴とする請求項4記載の移動局装置。
- 前記測定手段は、前記セルIDに関連付けられたCSI-RSの系列及び位置と、前記受信した信号に含まれるCSI-RSの位置及び送信電力とからCSI-RSを特定して前記隣接セルのCQIを測定することを特徴とする請求項4記載の移動局装置。
- 前記受信手段は、前記パラメータとして、前記サービングセル及び隣接セルにて相手側セルのCSI-RSがマッピングされるリソースエレメントに対応するリソースエレメントをヌルとするミューティングのオン/オフ又は周期を含む信号を受信し、前記測定手段は、前記ミューティングによりヌルとされるリソースエレメントの干渉成分を推定して前記サービングセル及び隣接セルの信号対雑音電力値を測定することを特徴とする請求項4記載の移動局装置。
- 前記受信手段は、前記パラメータとして、前記ミューティングによりヌルとされるリソースエレメントの送信電力だけ増幅したCSI-RSに対する送信電力のオフセット量を含む信号を受信し、前記測定手段は、前記送信電力のオフセット量を反映した送信電力のCSI-RSに基づいて前記サービングセル及び隣接セルのCQIを測定することを特徴とする請求項7記載の移動局装置。
- サービングセルに設置された基地局装置において、隣接セルのCSI-RSに関するパラメータとして前記隣接セルのセルID、CSI-RSの位置及び送信電力を取得するステップと、前記パラメータを含む信号を生成するステップと、前記生成した信号を下りリンクで送信するステップとを具備することを特徴とする参照信号送信方法。
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BR112012025327A BR112012025327A2 (pt) | 2010-04-05 | 2011-04-05 | aparelho estação base, aparelho estação móvel e método de transmissão de sinal de referência |
EP11765925.0A EP2557834B1 (en) | 2010-04-05 | 2011-04-05 | Base station device, mobile station device and reference signal transmission method |
CN201180027781.8A CN102934476B (zh) | 2010-04-05 | 2011-04-05 | 基站装置、移动台装置以及参考信号发送方法 |
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JPWO2011126025A1 (ja) | 2013-07-11 |
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US20130077518A1 (en) | 2013-03-28 |
US9408085B2 (en) | 2016-08-02 |
EP2557834A4 (en) | 2017-07-19 |
MX2012011501A (es) | 2012-11-29 |
BR112012025327A2 (pt) | 2016-06-28 |
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