WO2010018742A1 - 無線基地局装置及び移動端末装置 - Google Patents
無線基地局装置及び移動端末装置 Download PDFInfo
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- WO2010018742A1 WO2010018742A1 PCT/JP2009/063321 JP2009063321W WO2010018742A1 WO 2010018742 A1 WO2010018742 A1 WO 2010018742A1 JP 2009063321 W JP2009063321 W JP 2009063321W WO 2010018742 A1 WO2010018742 A1 WO 2010018742A1
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- 230000005540 biological transmission Effects 0.000 claims abstract description 120
- 238000004891 communication Methods 0.000 claims description 97
- 238000000034 method Methods 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000023402 cell communication Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a radio base station apparatus and a mobile terminal apparatus in a next generation mobile communication system.
- a handover is performed to switch the communication base station apparatus.
- the required QoS (Quality of Service) below the data link layer is guaranteed by macro diversity between cells.
- the cell switching cycle is 100 ms in consideration of high-speed packet scheduling and ARQ (Automatic Repeat Request).
- LTE Long Term Evolution
- IMT-A IMT Advanced
- next-generation mobile communication system As described above, it is required to perform the cell switching cycle in macro diversity at the time of handover at a higher speed, but it is possible to realize cell selection at a faster cell switching cycle. There is currently no way.
- the present invention has been made in view of such a point, and an object thereof is to provide a radio base station apparatus and a mobile terminal apparatus capable of performing cell selection at a faster cell switching period at the time of handover.
- the radio base station apparatus is based on information from a mobile terminal apparatus and a transmission / reception means having a plurality of transmission / reception units that can be remotely extended from the mobile terminal apparatus.
- Fast cell selection judging means for judging whether or not cell selection is applied; and when the fast cell selection judging means judges that fast cell selection is to be applied, transmission / transmission stop for each of the plurality of transmission / reception units And a control means for controlling.
- the radio base station apparatus determines whether or not fast cell selection is applied at the time of handover based on information from the mobile terminal apparatus.
- Control transmission / transmission stop of at least one transmission / reception unit This transmission / transmission stop control can be performed collectively for a transmitter / receiver unit that is remotely extended and a transmitter / receiver unit provided in its own apparatus, and a faster cell switching period in macro diversity during handover Cell selection can be performed with.
- FIG. 1 It is a figure which shows the radio base station apparatus and mobile terminal apparatus which concern on Embodiment 1 of this invention. It is a figure which shows schematic structure of the radio base station apparatus which concerns on Embodiment 1 of this invention.
- (A)-(c) is a figure which shows the format of downlink control information. It is a figure which shows schematic structure of the mobile terminal device which concerns on Embodiment 1 of this invention.
- (A)-(c) is a figure which shows the format for the feedback of the communication environment information to a wireless base station apparatus.
- (A), (b) is a figure which shows application of FCS of a control channel and a data channel. It is a figure which shows schematic structure of the radio base station apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows schematic structure of the mobile terminal apparatus which concerns on Embodiment 2 of this invention.
- FIG. 1 is a diagram illustrating a radio base station apparatus and a mobile terminal apparatus according to an embodiment of the present invention.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the radio base station apparatus has the configuration shown in FIG.
- This radio base station apparatus includes a transmission / reception unit 1 a provided in the main apparatus 1 and at least one transmission / reception unit 1 b, 1 c that is remotely extended by an optical fiber 3.
- the radio base station apparatus 1 includes a cell processing unit (baseband processing unit, call control processing unit, etc.) of the transmission / reception unit 1a, and a cell processing unit (baseband processing unit, call control processing unit, etc.) of the transmission / reception unit 1b.
- All the cell processing units (baseband processing unit, call control processing unit, etc.) of the transmission / reception unit 1c are provided in the main apparatus 1, and transmission / transmission is performed for each cell of the transmission / reception units 1a, 1b, 1c.
- a multi-cell scheduling control unit (to be described later) that collectively performs scheduling for stopping and an FCS determination unit (to be described later) that determines whether to apply fast cell selection (Fast Cell Selection (FCS)) are provided.
- the transmission / reception units 1b and 1c are remotely extended by the optical fiber 3.
- each processing unit of the transmission / reception unit 1b, 1c is provided in the main apparatus 1, and multi-cell scheduling
- the control unit and the FCS determination unit are collected in the main apparatus 1, since the downlink processing units for the neighboring cells are collected in the main apparatus 1, transmission for the downlink to each cell of the neighboring cell.
- Signal scheduling can be performed collectively.
- the communication environment information (communication environment information, etc.) between each transmission / reception unit 1a, 1b, 1c and the mobile terminal device 2 is transmitted via the optical fiber 3 by the uplink signal received by each transmission / reception unit 1a, 1b, 1c.
- the transmission / reception units 1b and 1c are not necessarily extended remotely, and a plurality of transmission / reception units may be provided in the main apparatus 1. Or the structure which is not provided with the transmission / reception part 1a in the main apparatus 1 is also possible. Further, it is possible to use a cable other than the optical cable as the cable connecting the main device 1 and the overhanging transmission / reception units 1b and 1c.
- FCS mode FCS mode
- a downlink signal is transmitted from a cell (transmission / reception unit) having the best communication environment among neighboring cells, and transmission from other cells (transmission / reception unit) is stopped.
- Whether or not the FCS needs to be applied that is, whether or not the mobile terminal device 2 is at the cell edge (cell edge identification) is determined by, for example, the identification information (cell ID) of the neighboring cell and the reference signal received power (Reference Signal) of the cell. It is preferable to use Received Power (RSRP).
- RSRP Received Power
- the RSRPs of neighboring cells for example, the handover source and the handover destination
- the RSRPs of both are compared, and it is determined whether or not the difference is within a predetermined range.
- the mobile terminal device 2 is not close to either of the transmission / reception units, but is equally distant from both of the transmission / reception units, that is, at the cell edge. Because it is.
- FIG. 2 is a diagram showing a configuration of the radio base station apparatus according to the embodiment of the present invention.
- the radio base station apparatus shown in FIG. 2 is an apparatus that generates only cell-specific reference signals.
- the radio base station apparatus shown in FIG. 2 includes processing units (cell # 1 processing unit, cell # 2 processing unit, cell # 3 processing unit) of a plurality of neighboring cells (here, three cells), Cell # 1, cell # 2, and cell # 3 transmission amplifiers 109a, 109b, and 109c, an FCS determination unit 111 that determines whether to apply FCS, and each cell # 1, cell # 2, and cell # 3 And a multi-cell scheduling control unit 110 that collectively performs transmission / transmission stop for.
- processing units cell # 1 processing unit, cell # 2 processing unit, cell # 3 processing unit
- FCS determination unit 111 that determines whether to apply FCS
- a multi-cell scheduling control unit 110 that collectively performs transmission / transmission stop for.
- the transmission amplifiers 109a, 109b and 109c are included in the above-described transmission / reception units (transmission / reception units 1a, 1b and 1c in FIG. 1), respectively, and transmit cell # 1 transmission signal, cell # 2 transmission signal and cell # 3 transmission, respectively. Used when transmitting signals. Further, as shown in FIG. 1, the transmission amplifiers 109b and 109c are mounted on a transmission / reception unit that is extended by an optical fiber and installed remotely. Each cell processing unit includes a reception processing unit (not shown).
- Each processing unit includes a downlink control information generation unit 101 that generates control information (control signal) to be transmitted to the mobile terminal apparatus, and a downlink control information encoding / modulation unit 102 that encodes and modulates the downlink control information.
- a downlink RS sequence generation unit 103 that generates a reference signal (RS) system example (cell-specific reference signal sequence) used for channel estimation in the mobile terminal device, and a downlink that generates data to be transmitted to the mobile terminal device
- Downlink multiplexing section 106 for multiplexing
- IFFT section 107 for performing IFFT (Inverse Fast Fourier Transform) operation on the signal after channel multiplexing
- a CP adding unit 108 for adding CP (Cyclic Prefix) to, and
- the FCS application determination unit 111 is information required for FCS application determination obtained from the received signal in the mobile terminal device (for example, whether the mobile terminal device is at the cell edge (for example, whether the RSRP difference is within a predetermined range). )) Is notified from the mobile terminal device. This notification is performed using, for example, signaling in an upper layer.
- the FCS application information (determination result) determined by the FCS application determining unit 111, that is, whether to apply the FCS, and information on which cell to perform the FCS as necessary is downlink control in the processing unit of each cell.
- the data is output to the information generation unit 101, the downlink transmission data generation unit 104, and the multicell scheduling control unit 110.
- FCS application determination unit 111 determines whether to apply FCS (applies FCS when the mobile terminal apparatus is at the cell edge).
- Information (FCS application information) that the FCS is applied is output to the downlink control information generation unit 101 of each cell, and is also output to the multi-cell scheduling control unit 110 to perform high-speed cell selection. To do.
- the FCS application information may be notified to the mobile terminal device.
- the mobile terminal device By notifying the mobile terminal device of FCS application information, the mobile terminal device acquires all the communication environment information of neighboring cells, specifies the cell with the best communication environment, or communicates between cells. It is possible to obtain the relative relationship of the environment and feed back the communication environment information, cell information, and the relative relationship of the communication environment to the radio base station apparatus.
- This notification of FCS application information may be performed using, for example, signaling in an upper layer, or may be transmitted to the mobile terminal apparatus through an individual control channel or the like.
- FCS application information is not notified to the mobile terminal apparatus
- communication environment information based on channel estimation using the terminal-specific reference signal is fed back to the radio base station apparatus, and the radio base station apparatus is based on the single cell.
- the FCS application determination is performed based on the communication environment information.
- the FCS application information is output from the FCS application determination unit 111 to the downlink control information generation unit 101 as described above.
- the downlink control information includes a user ID (terminal identification information), radio resource allocation information, and the like.
- the user ID is collated by the mobile terminal device, and only the mobile terminal device corresponding to the user ID can decode the radio resource allocation information (blind Coding).
- FCS information is output to the downlink control information generation unit 101.
- the downlink control information generation unit 101 adds cell identification information (cell identifier) corresponding to the transmission / reception unit that performs transmission to the downlink control information.
- the downlink control information generation unit 101 may generate a control signal including identification information of a cell to be transmitted when applying FCS. That is, the downlink control signal may be generated in a format as shown in FIG.
- a mobile terminal apparatus that has received such downlink control information can decode cell identification information blindly by coding, and thereby identify a cell to be transmitted. Therefore, the mobile terminal apparatus can identify which cell the cell-specific reference signal belongs (which cell format is used), and thereby perform channel estimation using the cell-specific reference signal. Is possible.
- the downlink control information generation unit 101 may generate a control signal including transmission power information. That is, as shown in FIG. 3B, transmission power information may be added in addition to the cell identification information. By adding the transmission power information in this way, it is possible to notify the mobile terminal device of the transmission power when FCS is applied, and therefore it is possible to transmit with stronger transmission power than usual when FCS is applied. Further, the downlink control information generation unit 101 may generate a control signal including information on the presence / absence of a terminal-specific reference signal. That is, as shown in FIG. 3C, presence / absence information on the terminal-specific reference signal may be added in addition to the cell identification information. By adding presence / absence information on the terminal-specific reference signal in this way, it is possible to notify the mobile terminal apparatus of the use of the terminal-specific reference signal. Therefore, the terminal-specific reference signal additionally used in the mobile terminal apparatus is also used. Channel estimation.
- the multi-cell scheduling (high-speed cell selection) control unit 110 When the multi-cell scheduling (high-speed cell selection) control unit 110 receives FCS application information from the FCS application determination unit 111, the multi-cell scheduling (high-speed cell selection) control unit 110 performs transmission from the transmission / reception unit (cell) having the best communication environment to the mobile terminal apparatus. Multi-cell scheduling is performed so that transmission from (cell) to the mobile terminal apparatus is not performed. That is, in the FCS mode, the multi-cell scheduling control unit 110 selects a cell with the best communication environment based on communication environment information (for example, CQI (Channel Quality Indicator) and PMI) of neighboring cells transmitted from the mobile terminal apparatus.
- communication environment information for example, CQI (Channel Quality Indicator) and PMI
- the multi-cell scheduling control unit 110 performs scheduling including control of transmission cells and transmission stop cells for a plurality of cells at once.
- FIG. 4 is a diagram illustrating a configuration of a mobile terminal apparatus that performs radio communication with the radio base station apparatus illustrated in FIG.
- the mobile terminal apparatus shown in FIG. 4 includes a CP removing unit 201 that removes a CP from a signal transmitted from a radio base station apparatus, an FFT unit 202 that performs an FFT operation on a received signal, and a signal after the FFT operation as control information, A downlink channel separation unit 203 that separates the reference signal and data, a downlink control information reception unit 204 that performs a predetermined reception process on the separated downlink control information, and a channel that performs channel estimation using the separated reference signal An estimation unit 205, a channel estimation cell selection unit 206 for selecting a transmission cell to perform reception processing from the channel estimation result, a downlink transmission data reception unit 207 for performing predetermined reception processing on the separated downlink transmission data, and a channel estimation result Communication environment information estimation unit 208 that estimates a communication environment (CQI or PMI) based on the communication environment information,
- the FCS application information is output to the downlink control information reception unit 204 and the multi-cell communication environment information generation unit 209.
- the multi-cell communication environment information generation unit 209 Upon receiving the FCS application information, the multi-cell communication environment information generation unit 209 generates the communication environment status (multi-cell communication environment information) of the peripheral cell using the communication environment information (for example, CQI or PMI) of the peripheral cell, and wireless Report to the base station apparatus (feedback to the radio base station apparatus). Thereby, the radio base station apparatus can know which cell has a good communication environment among neighboring cells.
- the communication environment information for example, CQI or PMI
- the mobile terminal apparatus feeds back communication environment information to the radio base station apparatus
- various methods can be mentioned.
- the communication environment information related to the neighboring cells the communication environment information about each cell is included, that is, all the communication environment information of the neighboring cells is reported in a format as shown in FIG.
- the cell includes the identification information of the cell having the best communication state and the communication environment information of the cell having the best communication state, that is, according to the format shown in FIG. The cell communication environment information is compared to identify the best cell, and the cell identification information and the cell communication environment information are reported.
- the communication environment information related to the neighboring cell includes the communication environment information about the specific cell and the relative value of the communication environment information of the other neighboring cells with respect to the communication environment information about the specific cell, that is, FIG.
- the communication environment information of a specific cell for example, the cell of the handover source
- the relative value with respect to the communication environment information are reported.
- the downlink control information reception unit 204 performs predetermined reception processing, for example, blind coding on the downlink control information. Thereby, it is possible to identify whether the data is addressed to the own device. When the data is identified as being addressed to the own device, the information is sent to the downlink transmission data reception unit 207, and predetermined reception processing, for example, demodulation and decoding is performed on the downlink transmission data.
- predetermined reception processing for example, demodulation and decoding is performed on the downlink transmission data.
- the FCS application information is notified to the downlink control information receiving unit 204, reception is performed by changing the FCS reception format, or the number of cells to be received is increased.
- FCS is applied, as shown in FIG. 6 (a), only the data channel (PDSCH) is FCS, and as shown in FIG. 6 (b), the data channel (PDSCH) and the control channel ( PDCCH) and FCS together.
- FIG. 6B since the data channel and the control channel are transmitted from the same cell, one cell may be received. However, in the case shown in FIG. And the control channel may be transmitted from different cells. In this case, since it is necessary to receive signals from two cells, in such a case, the downlink control information receiving unit 204 increases the number of cells to be received.
- FCS Fibre Channel Signal
- information necessary for FCS application determination obtained from the received signal (for example, information on whether or not the RSRP difference is within a predetermined range) is notified from the mobile terminal device. This notification is performed using, for example, signaling in an upper layer.
- the FCS application determination unit 111 of the radio base station apparatus receives information necessary for FCS application determination, the FCS application determination unit 111 determines whether to apply FCS.
- FCS application information is output to the downlink control information generating unit 101 and the multi-cell scheduling control unit 110 of the processing unit of each cell.
- Communication environment information (CQI or PMI) is sent from the mobile terminal device to the multi-cell scheduling control unit 110. Then, the multi-cell scheduling control unit 110 performs scheduling by selecting a cell having the best communication environment based on the communication environment information. In this case, the mobile terminal device transmits the communication environment information in the format shown in FIGS. This scheduling information is sent to the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the processing unit of the cell with the best communication environment (scheduled cell). Then, the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the cell having the best communication environment generate control information and transmission data based on this scheduling information, and the generated control information and transmission data are It is transmitted via the corresponding transmission amplifier.
- CQI or PMI Communication environment information
- the control information and the transmission data are generated by the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the cell # 2, and the control information and the transmission data Is transmitted from a transmission amplifier 109b installed remotely via an optical fiber.
- the mobile terminal apparatus receives the FCS application information from the radio base station apparatus, and outputs it to the downlink control information receiving section 204 and the multicell communication environment information generating section 209. Also, in the mobile terminal device, the downlink control information receiving unit 204 performs blind decoding to identify whether or not the control information is the own device. This identification information is sent to the downlink transmission data receiving unit 207.
- channel estimation section 205 performs channel estimation using the cell-specific reference signal included in the downlink signal from the radio base station apparatus. The obtained channel estimation value is used for reception processing in downlink transmission data reception section 207. In this way, downlink transmission data is obtained.
- the downlink control information receiving unit 204 increases the number of cells to be received, and therefore performs channel estimation. Cells also increase. For this reason, the identification information obtained by the downlink control information receiving section 204 is output to the channel estimation cell selecting section 206. Then, channel estimation cell selection section 206 uses this identification information to select a channel estimation value to be used for downlink transmission data reception processing from a plurality of channel estimation values from channel estimation section 205.
- the channel estimation value for each cell obtained by the channel estimation unit 205 is sent to the communication environment information estimation unit 208, and the communication environment is estimated for each cell. Then, the communication environment information for each cell is sent to the multi-cell communication environment information generation unit 209.
- the multi-cell communication environment information generation unit 209 generates communication environment information that is fed back to the radio base station apparatus from the communication environment information for each cell. This communication environment information is fed back to the radio base station apparatus using, for example, the formats shown in FIGS. 3 (a) to 3 (c). Then, the multi-cell scheduling control unit 110 of the radio base station apparatus performs scheduling by selecting a cell having the best communication environment based on the communication environment information.
- the radio base station apparatus determines whether FCS is applied at the time of handover based on information from the mobile terminal apparatus, and determines that FCS is applied.
- the transmission / reception stop of at least one transmission / reception unit projecting remotely by the optical fiber and the transmission / reception unit provided in the own apparatus is controlled. This transmission / transmission stop control is performed collectively for the transmission / reception unit that is remotely extended by the optical fiber and the transmission / reception unit provided in the own device, so that faster cell switching is performed in macro diversity during handover. Cell selection can be performed in a cycle.
- FIG. 7 is a diagram illustrating the configuration of the radio base station apparatus according to Embodiment 2.
- the radio base station apparatus shown in FIG. 7 includes an individual RS sequence generation unit 112 that generates a terminal-specific reference signal (individual RS).
- FCS application information from the FCS application determination unit 111 is input to the individual RS sequence generation unit 112, and the individual RS sequence generation unit 112 receives the individual RS sequence when the FCS application information is input. Is generated.
- the generated individual RS is sent to the downlink channel multiplexer 106 and multiplexed as a downlink signal.
- FIG. 8 is a diagram illustrating a configuration of the mobile terminal apparatus according to the second embodiment.
- the radio base station apparatus shown in FIG. 8 includes an individual RS channel estimation unit 210 that performs channel estimation using a terminal-specific reference signal (individual RS), and is obtained using a cell-specific reference signal (common RS).
- a channel estimation cell selection / synthesis unit 211 that combines or selects channel estimation values obtained using channel estimation values and individual RSs is provided instead of the channel estimation cell selection unit 206.
- the channel estimation cell selection / combination unit 211 receives FCS application information from the FCS application determination unit 111, and the channel estimation cell selection / combination unit 211 receives the FCS application information. Select whether to use channel estimation value using terminal-specific reference signal or channel estimation value using cell-specific reference signal, or use channel estimation value and specific reference signal using terminal-specific reference signal And the estimated channel value.
- the accuracy of the channel estimation value can be increased and the reception quality of the downlink transmission data can be improved.
- FCS Fibre Channel Signal
- information necessary for FCS application determination obtained from the received signal (for example, information on whether or not the RSRP difference is within a predetermined range) is notified from the mobile terminal device. This notification is performed using, for example, signaling in an upper layer.
- the FCS application determination unit 111 of the radio base station apparatus receives information necessary for FCS application determination, the FCS application determination unit 111 determines whether to apply FCS.
- FCS application information is output to the downlink control information generating unit 101, the multi-cell scheduling control unit 110, and the dedicated RS sequence generating unit 112 of the processing unit of each cell.
- Communication environment information (CQI or PMI) is sent from the mobile terminal device to the multi-cell scheduling control unit 110. Then, the multi-cell scheduling control unit 110 performs scheduling by selecting a cell having the best communication environment based on the communication environment information. In this case, the mobile terminal device transmits the communication environment information in the format shown in FIGS. This scheduling information is sent to the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the processing unit of the cell with the best communication environment (scheduled cell). Then, the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the cell having the best communication environment generate control information and transmission data based on this scheduling information, and the generated control information and transmission data are It is transmitted via the corresponding transmission amplifier.
- CQI or PMI Communication environment information
- the control information and the transmission data are generated by the downlink control information generation unit 101 and the downlink transmission data generation unit 104 of the cell # 2, and the control information and the transmission data Is transmitted from a transmission amplifier 109b installed remotely via an optical fiber.
- FCS application information is sent to dedicated RS sequence generation section 112, a terminal-specific reference signal is generated, and this terminal-specific reference signal is multiplexed on the downlink signal.
- the mobile terminal apparatus receives the FCS application information from the radio base station apparatus, and outputs it to the downlink control information receiving section 204 and the multicell communication environment information generating section 209. Also, in the mobile terminal device, the downlink control information receiving unit 204 performs blind decoding to identify whether or not the control information is the own device. This identification information is sent to the downlink transmission data receiving unit 207.
- channel estimation section 205 performs channel estimation using the cell-specific reference signal included in the downlink signal from the radio base station apparatus.
- channel estimation section 210 for dedicated RS performs channel estimation using the terminal-specific reference signal. These channel estimation values are sent to the channel estimation cell selection / synthesis unit 211. Then, channel estimation cell selection / combination section 211 selects or combines the channel estimation values. This channel estimation value is used for reception processing in downlink transmission data reception section 207. In this way, downlink transmission data is obtained.
- the downlink control information receiving unit 204 increases the number of cells to be received, and therefore performs channel estimation. Cells also increase. For this reason, the identification information obtained by the downlink control information receiving section 204 is output to the channel estimation cell selecting / combining section 211. Then, channel estimation cell selection / combination section 211 uses this identification information to select a channel estimation value to be used for downlink transmission data reception processing from a plurality of channel estimation values from channel estimation section 205.
- the channel estimation value for each cell obtained by the channel estimation unit 205 is sent to the communication environment information estimation unit 208, and the communication environment is estimated for each cell. Then, the communication environment information for each cell is sent to the multi-cell communication environment information generation unit 209.
- the multi-cell communication environment information generation unit 209 generates communication environment information that is fed back to the radio base station apparatus from the communication environment information for each cell. This communication environment information is fed back to the radio base station apparatus using, for example, the formats shown in FIGS. 3 (a) to 3 (c). Then, the multi-cell scheduling control unit 110 of the radio base station apparatus performs scheduling by selecting a cell having the best communication environment based on the communication environment information.
- the radio base station apparatus determines whether FCS is applied at the time of handover based on information from the mobile terminal apparatus, and is determined to apply FCS.
- the transmission / reception stop of at least one transmission / reception unit projecting remotely by the optical fiber and the transmission / reception unit provided in the own apparatus is controlled. This transmission / transmission stop control is performed collectively for the transmission / reception unit that is remotely extended by the optical fiber and the transmission / reception unit provided in the own device, so that faster cell switching is performed in macro diversity at the time of handover. Cell selection can be performed in a cycle.
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- the parameters indicating the number of cells, the number of processing units, the processing procedure, and the communication environment in the above description can be appropriately changed and implemented without departing from the scope of the present invention.
- Other modifications can be made without departing from the scope of the present invention.
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Abstract
Description
(実施の形態1)
図1は、本発明の実施の形態に係る無線基地局装置及び移動端末装置を示す図である。この無線基地局装置及び移動端末装置で構成された無線通信システムにおいて、多重方式として、下り回線(下りリンク)にOFDMA(Orthogonal Frequency Division Multiple Access)を用い、上り回線(上りリンク)にSC-FDMA(Single Carrier Frequency Division Multiple Access)を用いている。
本実施の形態においては、セル固有参照信号に加えて端末固有参照信号を用いてチャネル推定を行う場合について説明する。
図7は、実施の形態2に係る無線基地局装置の構成を示す図である。なお、図7において、図2と同じ部分については図2と同じ符号を付して、その詳細な説明は省略する。図7に示す無線基地局装置においては、端末固有参照信号(個別RS)を生成する個別RS系列生成部112を備えている。この個別RS系列生成部112には、FCS適用判定部111からのFCS適用情報が入力されるようになっており、個別RS系列生成部112は、このFCS適用情報が入力されると、個別RSを生成する。生成された個別RSは、下りチャネル多重部106に送られて下り回線信号として多重される。
Claims (12)
- 自装置から遠隔に張り出すことができる複数の送受信部を備えた送受信手段と、移動端末装置からの情報に基づいて、当該移動端末装置のハンドオーバの際に高速セル選択が適用されるかどうかを判定する高速セル選択判定手段と、前記高速セル選択判定手段において高速セル選択を適用すると判定されたときに、前記複数の送受信部のそれぞれについて送信/送信停止を制御する制御手段と、を具備することを特徴とする無線基地局装置。
- 前記高速セル選択を適用すると判定されたときに、高速セル選択情報を前記移動端末装置に通知する通知手段を具備することを特徴とする請求項1記載の無線基地局装置。
- 前記高速セル選択を適用すると判定されたときに、セル固有参照信号に加えて端末固有参照信号を生成する参照信号生成手段を具備することを特徴とする請求項1又は請求項2記載の無線基地局装置。
- 前記高速セル選択を適用すると判定されたときに、送信を行う送受信部の識別情報を含む制御信号を生成する制御信号生成手段を具備することを特徴とする請求項1から請求項3のいずれかに記載の無線基地局装置。
- 前記制御信号生成手段は、送信電力情報を含めて制御信号を生成することを特徴とする請求項4記載の無線基地局装置。
- 前記制御信号生成手段は、端末固有参照信号の有無の情報を含めて制御信号を生成することを特徴とする請求項4記載の無線基地局装置。
- 無線基地局装置からのセル固有参照信号を用いてチャネル推定を行うチャネル推定手段と、前記チャネル推定手段で求められた通信環境情報を生成する通信環境情報生成手段と、を具備し、前記通信環境情報生成手段は、高速セル選択が適用されるときに、周辺セルに関する通信環境情報を生成することを特徴とする移動端末装置。
- 前記周辺セルに関する通信環境情報は、各セルについての通信環境情報を含むことを特徴とする請求項7記載の移動端末装置。
- 前記周辺セルに関する通信環境情報は、通信状態が最も良いセルの識別情報と、前記通信状態が最も良いセルの通信環境情報と、を含むことを特徴とする請求項7記載の移動端末装置。
- 前記周辺セルに関する通信環境情報は、特定のセルについての通信環境情報と、前記特定のセルについての通信環境情報に対する他の周辺セルの通信環境情報の相対値と、を含むことを特徴とする請求項7記載の移動端末装置。
- 前記高速セル選択が適用されるときに、高速セル選択情報を前記無線基地局装置から受け取ることを特徴とする請求項7から請求項10のいずれかに記載の移動端末装置。
- 前記チャネル推定手段は、前記高速セル選択が適用されるときに、前記セル固有参照信号に加えて端末固有参照信号を用いてチャネル推定を行うことを特徴とする請求項7から請求項11のいずれかに記載の移動端末装置。
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US13/058,468 US20110183673A1 (en) | 2008-08-11 | 2009-07-27 | Radio base station apparatus and mobile terminal |
CN2009801311611A CN102119557B (zh) | 2008-08-11 | 2009-07-27 | 无线基站装置以及移动终端装置 |
EP09806637.6A EP2315476B1 (en) | 2008-08-11 | 2009-07-27 | Radio base station device and mobile terminal device |
US14/480,933 US9232447B2 (en) | 2008-08-11 | 2014-09-09 | Radio base station apparatus and mobile terminal |
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US14/480,933 Continuation US9232447B2 (en) | 2008-08-11 | 2014-09-09 | Radio base station apparatus and mobile terminal |
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JP2018056603A (ja) * | 2015-02-13 | 2018-04-05 | シャープ株式会社 | 基地局装置、端末装置および通信方法 |
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Also Published As
Publication number | Publication date |
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EP2315476B1 (en) | 2018-07-04 |
CN102119557A (zh) | 2011-07-06 |
US9232447B2 (en) | 2016-01-05 |
CN102119557B (zh) | 2013-11-27 |
CN103501522A (zh) | 2014-01-08 |
US20140378139A1 (en) | 2014-12-25 |
JP5103323B2 (ja) | 2012-12-19 |
EP2315476A4 (en) | 2016-05-25 |
US20110183673A1 (en) | 2011-07-28 |
EP2315476A1 (en) | 2011-04-27 |
JP2010045550A (ja) | 2010-02-25 |
KR101597667B1 (ko) | 2016-02-25 |
CN103501522B (zh) | 2017-01-04 |
KR20110039469A (ko) | 2011-04-18 |
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