WO2016017328A1 - ユーザ端末、無線通信システムおよび無線通信方法 - Google Patents
ユーザ端末、無線通信システムおよび無線通信方法 Download PDFInfo
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- WO2016017328A1 WO2016017328A1 PCT/JP2015/068212 JP2015068212W WO2016017328A1 WO 2016017328 A1 WO2016017328 A1 WO 2016017328A1 JP 2015068212 W JP2015068212 W JP 2015068212W WO 2016017328 A1 WO2016017328 A1 WO 2016017328A1
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- lbt
- user terminal
- idle
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- channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the present invention relates to a user terminal, a radio communication system, and a radio communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- LTE-A LTE advanced or LTE enhancement
- a small cell for example, a pico cell, a femto cell, etc.
- a macro cell having a wide coverage area of a radius of several kilometers.
- Heterogeneous Network is being studied (Non-Patent Document 2).
- HetNet use of carriers in different frequency bands as well as in the same frequency band between a macro cell (macro base station) and a small cell (small base station) is also under consideration.
- LTE-U LTE Unlicensed or LAA: Licensed-Assisted Access
- a licensed band is a band that is permitted to be used exclusively by a specific operator
- an unlicensed band is a band in which a radio station can be installed without being limited to a specific operator. It is.
- non-licensed bands for example, use of a 2.4 GHz band, a 5 GHz band that can use Wi-Fi or Bluetooth (registered trademark), a 60 GHz band that can use millimeter wave radar, and the like has been studied. Application of such a non-licensed band in a small cell is also under consideration.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- Stage 2 3GPP TR 36.814 “E-UTRA further advancements for E-UTRA physical layer aspects”
- the non-licensed band is not limited to use only by a specific operator. Further, unlike the license band, the non-licensed band is not limited to the use of a specific wireless system (for example, LTE, Wi-Fi, etc.). For this reason, there is a possibility that the frequency band used in the LAA of a certain operator overlaps with the frequency band used in the LAA or Wi-Fi of another operator.
- a specific wireless system for example, LTE, Wi-Fi, etc.
- the non-licensed band it is assumed that different operators and non-operators operate without synchronization, cooperation or cooperation.
- installation of a wireless access point (AP) or a wireless base station (eNB) is performed without cooperation or cooperation between different operators or non-operators.
- the non-licensed band may cause a large mutual interference different from the license band.
- Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) based on the LBT (Listen Before Talk) mechanism is adopted. Specifically, each transmission point (TP: Transmission Point) or access point (AP: Access Point) and the user terminal perform listening (CCA: Clear Channel Assessment) before transmission, and exceed a predetermined level. A method of transmitting only when there is no signal is used. When a signal exceeding a predetermined level exists, a waiting time that is randomly given is provided, and then listening is performed again.
- TP Transmission Point
- AP Access Point
- CCA Clear Channel Assessment
- the LAA system similarly to the Wi-Fi system, it is conceivable to perform a method of stopping transmission (LBT and random backoff) according to the listening result. For example, in a non-licensed band cell, listening is performed before transmitting a signal, and it is confirmed whether another system (for example, Wi-Fi) or another LAA transmission point is communicating, and the signal is determined according to the LBT result. It is conceivable to control the presence or absence of transmission.
- LBT and random backoff For example, in a non-licensed band cell, listening is performed before transmitting a signal, and it is confirmed whether another system (for example, Wi-Fi) or another LAA transmission point is communicating, and the signal is determined according to the LBT result. It is conceivable to control the presence or absence of transmission.
- the reception quality reflects the state of interference, the LBT idle state, that is, the state where the signal from the transmission point of another system or another LAA is not detected by the listening and the LBT busy state, that is, the state where the other system or It is assumed that the reception quality differs greatly from the state in which the signal from the LAA transmission point is detected. Therefore, in the measurement and reporting of reception quality by the conventional user terminal, the measurement result largely fluctuates depending on the state of interference at the timing of measurement, so that the accuracy deteriorates and appropriate for cell selection, transmission control, etc. The reception quality cannot be measured.
- the present invention has been made in view of the above points, and a user terminal, a radio communication system, and a radio that can appropriately perform measurement and reporting of reception quality in a radio communication system (LAA) that operates LTE in a non-licensed band.
- LAA radio communication system
- the user terminal of the present invention is a user terminal that can communicate with a radio base station using a first frequency carrier in which LBT (Listen Before Talk) is set, and uses the LBT to transmit a beacon reference signal of a connected cell.
- LBT Listen Before Talk
- the controller recognizes that the channel of the connected cell is in an idle state (LBT idle ) and controls to measure the reception quality in the LBT idle subframe, and measures the reception quality during the LBT period.
- An acquisition unit that acquires the measurement result, and a transmission unit that transmits the measurement result.
- reception quality can be measured and reported appropriately in a wireless communication system (LAA) that operates LTE in a non-licensed band.
- LAA wireless communication system
- a frequency carrier in which LBT is not set is described as a license band
- a frequency carrier in which LBT is set is described as a non-license band
- the present invention is not limited to this. That is, the present embodiment can be applied regardless of the license band or the non-license band as long as it is a frequency carrier in which LBT is set.
- a plurality of scenarios such as carrier aggregation (CA), dual connectivity (DC), or stand-alone is assumed as a scenario of a wireless communication system (LAA) that operates LTE in a non-licensed band.
- CA carrier aggregation
- DC dual connectivity
- LAA wireless communication system
- a macro cell using a license band of 800 MHz band and a small cell using a non-licensed band of 5 GHz band are provided.
- a scenario in which carrier aggregation or dual connectivity is applied with a macro cell using a license band as a primary cell (Pcell) and a small cell using a non-licensed band as a secondary cell (Scell) is considered. It is done.
- FIG. 2A shows a scenario in which carrier aggregation is applied using a licensed band and a non-licensed band.
- Carrier aggregation is a technique for integrating a plurality of component carriers (also referred to as CC, carrier, cell, etc.) to increase the bandwidth.
- CC component carriers
- Each CC has, for example, a maximum bandwidth of 20 MHz, and a maximum bandwidth of 100 MHz is realized when a maximum of five CCs are integrated.
- a scheduler of one radio base station controls scheduling of a plurality of CCs.
- carrier aggregation is applied with a macro cell or small cell using a license band as a primary cell and a small cell using a non-licensed band as a secondary cell.
- a macro cell or a small cell operated in an FDD band (carrier) or TDD band is used as a primary cell, and a non-licensed band is used as a carrier dedicated to downlink (DL) transmission in a secondary cell.
- a macro cell or a small cell operated in the FDD band or the TDD band is used as a primary cell, and a small cell operated in a non-licensed band as TDD is used as a secondary cell.
- FIG. 2B shows a scenario in which dual connectivity is applied using a licensed band and a non-licensed band.
- Dual connectivity is similar to carrier aggregation in that a plurality of CCs are integrated to widen the bandwidth.
- carrier aggregation it is assumed that cells (or CCs) are connected by ideal backhaul and cooperative control with very small delay time is possible, whereas in dual connectivity, It is assumed that the cells are connected by a non-ideal backhaul whose delay time cannot be ignored. Therefore, in dual connectivity, it can be said that the cells are operated by different base stations, and the user terminal integrates cells (or CCs) of different frequencies operated by different base stations to realize a wide band.
- a plurality of schedulers are provided independently, and the plurality of schedulers control the scheduling of one or more cells (CCs) each having jurisdiction over.
- CCs cells
- carrier aggregation may be applied to each independently provided scheduler.
- dual connectivity is applied with a macro cell using a licensed band as a primary cell and a small cell using a non-licensed band as a secondary cell.
- a macro cell or a small cell operated in an FDD band or a TDD band is used as a primary cell, and a non-licensed band is used as a carrier dedicated for DL transmission in a secondary cell.
- a macro cell or a small cell operated in the FDD band or the TDD band is used as a primary cell, and a small cell operated in a non-licensed band as TDD is used as a secondary cell.
- a stand-alone in which a cell operating LTE using a non-licensed band operates alone is applied.
- the non-licensed band is operated in the TDD band.
- the LBT function may be introduced to LAA-LTE for fair frequency sharing with other RAT (Radio Access Technology) and other LAA-LTE operators.
- RAT Radio Access Technology
- a user terminal receives a reference signal over a plurality of time samples for reception quality measurement, and performs combining and averaging processes.
- a reference signal transmitted in the LBT idle state and the reference signal transmitted in the LBT busy state are observed, and the combined and averaged values are observed. May be processed.
- the interference state is reflected in the reception quality
- the reception quality is greatly different between the LBT idle state and the LBT busy state.
- the LBT busy state it is assumed that there is a large amount of interference because another system exists. Therefore, in the measurement and reporting of reception quality by a conventional user terminal, the measurement result largely fluctuates depending on the state of interference at the measurement timing, so that the accuracy deteriorates and the reception quality cannot be measured appropriately.
- the present inventors have found a method for appropriately measuring and reporting the reception quality when LBT is introduced in LAA-LTE.
- the user terminal separately performs reception quality measurement and reporting in the LBT idle state and the LBT busy state. That is, the user terminal needs to identify an idle state (LBT idle state) and a busy state (LBT busy state) of the channel.
- the user terminal can identify the result of the LBT in the connected base station, that is, the channel state, based on whether or not a beacon reference signal (BRS) or other reference signal is detected.
- BRS beacon reference signal
- FIG. 5 shows an example of a downlink LBT of a base station in scenarios 1A and 2A (see FIG. 2).
- the frame length is 10 [ms] and includes at least one LBT special subframe.
- This special subframe for LBT is newly defined unlike the special subframe in the existing TDD UL-DL configuration.
- the special subframe for LBT includes a guard period (GP), and the rest is a symbol that is a candidate for executing LBT and a symbol that is a candidate for transmitting BRS.
- the guard period may be variable according to the required number of LBT candidate symbols, or the guard period may be none. Or you may use the part of a guard period for downlink signal transmission like DwPTS (Downlink Pilot Time Slot) of a TDD special sub-frame.
- the base station selects one symbol or a plurality of symbols from among the LBT candidate symbols for LBT. Furthermore, the base station can use a beacon reference signal (BRS) as a channel reservation during LBT idle .
- BRS beacon reference signal
- Each base station may randomly select a symbol that performs LBT from candidate symbols with equal probability, or may make the selection probability for each symbol variable according to QoS (Quality of Service) or the like.
- a beacon reference signal (BRS) is transmitted after the LBT symbol. This indicates that the channel is occupied for DL data transmission until the next special subframe for LBT.
- a beacon reference signal occupies the entire bandwidth and is transmitted using a minimum of one OFDM symbol. If there are multiple remaining OFDM symbols after the LBT symbol, a beacon reference signal (BRS) is repeatedly transmitted with these symbols. Since the beacon reference signal (BRS) is repeatedly transmitted, a common beacon reference signal (BRS) can be used regardless of the position of the LBT symbol. It can be simplified.
- a beacon reference signal (BRS) is not transmitted.
- the last symbol of the LBT special subframe may be reserved for a beacon reference signal (BRS). That is, LBT may not be performed on the last symbol of the LBT special subframe.
- BRS beacon reference signal
- the last OFDM symbol is transmitted as a beacon reference signal (BRS) when the LBT result is in an idle state, and is not transmitted when the LBT result is busy.
- a beacon reference signal BRS
- BRS beacon reference signal
- a beacon reference signal BRS
- the operation differs between the case where the LBT is arranged in the last symbol and the case where it is arranged in another symbol.
- the last symbol of the LBT special subframe is reserved for the beacon reference signal (BRS)
- the same operation is performed in all cases, and the interference control effect by the beacon reference signal (BRS) is obtained. Can do.
- the user terminal Since the beacon reference signal (BRS) is transmitted only in the case of the LBT idle , the user terminal detects the beacon reference signal (BRS), so that the LBT result of the connected base station, that is, the channel idle state or busy state Can be identified.
- BRS beacon reference signal
- the beacon reference signal is one of existing reference signals such as CRS (Cell-specific Reference Signal), CSI-RS (Channel State Information Reference Signal) or DRS (Discovery Reference Signal), or a combination thereof. Also good.
- the beacon reference signal (BRS) may be a new cell specific signal.
- the beacon reference signal (BRS) may be a signal including the LAA cell ID and other broadcast information as a message.
- the beacon reference signal may be configurable to be optimized in different regions such as Japan, Europe, USA, for example.
- the beacon reference signal (BRS) may be configured not only to display the LBT result but also to be used for measurement of RSRP (Reference Signal Received Power) / RSRQ (Reference Signal Received Quality) and / or CSI. . That is, the beacon reference signal (BRS) may be used as a reference signal for RRM (Radio Resource Measurement) measurement or CSI measurement at the time of LBT idle .
- the reference signal for RRM / CSI measurement transmitted at the time of LBT idle and at the time of LBT busy may be changed.
- the user terminal can identify LBT idle or LBT busy according to the pattern of the measurement reference signal without performing beacon reference signal (BRS) detection.
- BRS beacon reference signal
- the user terminal When the user terminal recognizes the LBT idle or LBT busy by detecting the beacon reference signal (BRS), an operation other than the RRM / CSI measurement may be performed. For example, when the user terminal cannot detect the beacon reference signal (BRS) and recognizes the LBT busy , another LAA carrier or cell may be searched. When the user terminal detects a beacon reference signal (BRS) and recognizes the LBT idle , the user terminal may operate to receive PDCCH or EPDCCH. The user terminal may skip the reception operation of PDCCH / EPDCCH except when it detects the beacon reference signal (BRS) and recognizes the LBT idle .
- BRS beacon reference signal
- the user terminal When detecting other reference signals
- the beacon reference signal BRS
- the user terminal identifies the idle state or the busy state of the channel by detecting a reference signal included in each subframe, for example, CRS. can do. For example, when the user terminal detects CRS, the user terminal recognizes the LBT idle . Alternatively, the user terminal recognizes data transmission from the base station. When the user terminal does not detect CRS, the user terminal recognizes the LBT busy . Alternatively, the user terminal recognizes that data is not transmitted from the base station.
- CRS beacon reference signal
- the user terminal performs different functions depending on the recognized LBT result. For example, the user terminal measures and reports RSSI (Receive Signal Strength Indicator) / RSRQ according to the recognized LBT result. Alternatively, the user terminal measures and reports CSI measurement according to the recognized LBT result. Or a user terminal performs another function according to the recognized LBT result.
- RSSI Receiveive Signal Strength Indicator
- RSRQ Received Signal Strength Indicator
- FIG. 6A shows an example in which CRS is transmitted in a cycle of 1 [ms].
- the frame length is 10 [ms] and includes at least one LBT special subframe.
- the user terminal performs RSSI measurement in 9 [ms] subframes excluding the LBT special subframe.
- the RSSI depends on the surrounding interference.
- the interference around is low.
- the interference around is high. Therefore, even if the RSSI value is the same, when it is LBT idle , it means that the signal is large, and when it is LBT busy , it means that interference is high.
- RSSI is measured regardless of whether it is LBT idle or LBT busy .
- CC1 and CC2 having the same conditions except for the LBT result are taken as an example. It is assumed that the user terminal measures the same RSRP value from two CCs or channels. In the example of FIG. 7, the RSSI of CC1 is 0.82a, and the RSSI of CC2 is 0.89a. Therefore, the RSRQ of CC1 is larger than the RSRQ of CC2.
- the conventional user terminal determines that CC1 is superior to CC2.
- CC2 has more available idle resources.
- RSRQ the RSRQ of CC1
- CC2 has more available idle resources.
- the user terminal measures RSRQ (RSSI) only in the subframe of LBT idle . Specifically, the user terminal identifies whether the channel is idle or busy by detecting a beacon reference signal (BRS) in the LBT special subframe or by detecting another reference signal in each subframe. Then, the user terminal determines to measure RSSI only in the subframe of LBT idle (see FIG. 8). Further, the user terminal determines not to measure RSSI in the subframe of LBT busy (see FIG. 8).
- RSRQ RSRQ
- the user terminal reports RSRQ by a conventional method or an extended method.
- reporting is performed only when possible at the timing of regular reporting. If sufficient measurement samples are not obtained before the timing of periodic reporting, the user terminal skips periodic reporting. Sufficient measurement samples may be M samples, symbols or subframes, where M may be set by RRC signaling.
- the user terminal can start reporting RSRQ at an arbitrary timing after performing measurement of sufficient measurement samples.
- the timing of reporting is not fixed.
- Sufficient measurement samples may be M samples, symbols or subframes, where M may be set by RRC signaling.
- RRM Radio Resource Management
- the user terminal when the user terminal actually performs communication by measuring and reporting the RSRQ in the LBT idle , that is, an appropriate transmission parameter based on the quality of the idle channel. You can make a choice.
- the accurate RSRQ obtained in this way can be used in combination with the channel idle ratio (CCR: Channel Clear Ratio) at the base station to enable appropriate cell selection (Scell addition / removal or handover). Become.
- Opportunistic reporting can ensure accurate reporting results based on sufficient measurement samples.
- the user terminal may measure RSRQ (RSSI) in each of the LBT idle subframe and the LBT busy subframe. Specifically, the user terminal identifies whether the channel is idle or busy by detecting a beacon reference signal (BRS) in the LBT special subframe or by detecting another reference signal in each subframe. Then, the user terminal determines to measure two types of RSSI (see FIG. 9). That is, the user terminal, the RSSI idle measured at subframe LBT idle, measuring the RSSI busy in subframe LBT busy.
- RSSI beacon reference signal
- the user terminal reports two types of RSRQ measurement results explicitly or implicitly as necessary.
- the user terminal can report RSRQ in the extended manner described above.
- the explicit indication associated with each RSRQ can be used to indicate two types of RSRQ.
- the implicit indication can be in the order of the two types of RSRQ.
- the user terminal separately measures and reports RSRQ in LBT busy , so that the base station determines the difference in the measurement result at the user terminal when the base station determines that the channel is busy or idle. Can know. Thereby, even when the channel is determined to be busy, the base station can solve the exposed terminal problem by performing transmission to the user terminal when the interference is not large in the user terminal.
- FIG. 10 shows an example in which CSI-RS is transmitted in a cycle of 10 [ms].
- the frame length is 10 [ms] and includes at least one LBT special subframe.
- the user terminal performs CSI measurement in a subframe in which CSI-RS is transmitted.
- For the interference an average interference value in a past period or an instantaneous interference value of a subframe to be measured is considered.
- CSI measurement is performed regardless of whether it is LBT idle or LBT busy , there is a problem that inaccurate information is reported. For example, CSI measured in a conventional manner may not be able to indicate the state of the channel on which the data is actually transmitted.
- the user terminal measures CSI only in the subframe of LBT idle . Specifically, the user terminal identifies whether the channel is idle or busy by detecting a beacon reference signal (BRS) in the LBT special subframe or by detecting another reference signal in each subframe. Then, the user terminal determines to measure CSI only in the subframe of LBT idle (see FIG. 11). Further, the user terminal determines not to measure CSI in the subframe of LBT busy (see FIG. 11). The user terminal skips the CSI measurement timing when there is no measurement result of the LBT idle . In the carrier aggregation scenario, CSI may be reported in PCell using a license band.
- BRS beacon reference signal
- CSI measurement when the user terminal actually performs communication by measuring and reporting the CSI in the LBT idle , that is, an appropriate transmission parameter based on the quality of the idle channel.
- Settings can be made, for example, modulation and coding scheme (MCS) selection. Since there is no CSI measurement and reporting in the LBT busy subframe, the power consumption of the user terminal can be reduced.
- MCS modulation and coding scheme
- the base station does not have the correct CSI.
- the base station uses the latest reported CSI to select the modulation and coding scheme (MCS) if the LBT busy period is less than the threshold.
- MCS modulation and coding scheme
- the base station may use a conservative modulation and coding scheme (MCS) if the LBT busy period is greater than the threshold.
- the user terminal may measure CSI in each of the LBT idle subframe and the LBT busy subframe. Specifically, the user terminal identifies whether the channel is idle or busy by detecting a beacon reference signal (BRS) in the LBT special subframe or by detecting another reference signal in each subframe. Then, the user terminal determines to measure two types of CSI (see FIG. 12). That is, the user terminal measures the CSI idle subframe of LBT idle, measures the CSI busy in subframe LBT busy.
- BRS beacon reference signal
- the user terminal reports two types of CSI measurement results as necessary.
- the explicit indication associated with each CSI can be used to indicate two types of CSI.
- the user terminal measures and reports CSI in the LBT idle subframe.
- the user terminal measures and reports CSI in the LBT busy subframe. Therefore, an explicit instruction is not required, and the base station can grasp two types of CSI from the timing of reporting.
- the user terminal separately measures and reports the CSI in LBT busy , so that the base station determines the difference in the measurement result at the user terminal when the base station determines that the channel is busy or idle. Can know.
- the base station can solve the exposed terminal problem by performing transmission to the user terminal when the interference is not large in the user terminal.
- the base station knows that the CSI idle will be better than the CSI busy if there is a long period LBT busy before changing to the LBT idle , so use the latest LBT busy modulation and coding scheme (MCS) can do.
- MCS latest LBT busy modulation and coding scheme
- Another function the user terminal based on the identified LBT result when the case has been identified the LBT busy or LBT busy ratio is greater than the threshold value, may be performing different-frequency measurement for the other carriers.
- a new event that triggers a report may be defined. For example, when the user terminal identifies that the LBT busy ratio in the base station is larger than a threshold, the user terminal may report the different frequency measurement result for another carrier to the base station.
- FIG. 13 is a schematic configuration diagram showing an example of a radio communication system according to the present embodiment.
- the wireless communication system shown in FIG. 13 is a system that includes, for example, an LTE system or SUPER 3G.
- LTE system Long Term Evolution
- SUPER 3G carrier aggregation or dual connectivity in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit can be applied.
- the wireless communication system shown in FIG. 13 has a non-licensed band (LTE-U base station).
- This wireless communication system may be called IMT-Advanced, or may be called 4G, FRA (Future Radio Access).
- the user terminal 20 is arrange
- LAA non-license band
- a mode in which the macro cell C1 is used in the license band and the small cell C2 is used in the non-license band (LAA) is conceivable.
- LAA non-license band
- a mode in which a part of the small cell C2 is used in the license band and another small cell C2 is used in the non-licensed band is conceivable.
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies at the same time by carrier aggregation or dual connectivity. For example, transmission of assist information (DL signal configuration) regarding a radio base station 12 (for example, LTE-U base station) using a non-licensed band from the radio base station 11 using the license band to the user terminal 20 Can do. In addition, when carrier aggregation is performed in the license band and the non-license band, a configuration in which one radio base station (for example, the radio base station 11) controls the schedule of the license band cell and the non-license band cell may be employed. .
- DL signal configuration for example, LTE-U base station
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the wireless base station 11 and the wireless base station 12 or between the wireless base stations 12 can be configured to have a wired connection (Optical fiber, X2 interface, etc.) or a wireless connection.
- the radio base station 10 (radio base stations 11 and 12) is connected to the upper station apparatus 30 and connected to the core network 40 via the upper station apparatus 30.
- the radio base station 11 is composed of, for example, a macro base station having a relatively wide coverage, and forms a macro cell C1.
- the radio base station 12 is configured by a small base station having local coverage, and forms a small cell C2.
- the number of radio base stations 11 and 12 is not limited to the number shown in FIG.
- the same frequency band may be used, or different frequency bands may be used.
- the radio base stations 11 and 12 are connected to each other via an inter-base station interface (for example, optical fiber, X2 interface).
- the user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- the user terminal 20 can execute communication with other user terminals 20 via the radio base station 10.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a downlink control channel (PDCCH: Physical Downlink Control Channel, EPDCCH: Enhanced Physical Downlink Control Channel). ), A broadcast channel (PBCH) or the like is used.
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- PBCH broadcast channel
- DCI Downlink control information
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), or the like is used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data and higher layer control information are transmitted by PUSCH.
- FIG. 14 is an overall configuration diagram of the radio base station 10 (radio base stations 11 and 12) according to the present embodiment.
- the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO transmission, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and an interface. Part 106.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the interface unit 106.
- the baseband signal processing unit 104 performs PDCP layer processing, user data division / combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse
- the baseband signal processing unit 104 notifies control information (system information) for communication in the cell to the user terminal 20 by higher layer signaling (for example, RRC signaling, broadcast information, etc.).
- the information for communication in the cell includes, for example, the system bandwidth in the uplink or the downlink.
- assist information for example, DL TPC information, etc.
- the radio base station for example, radio base station 11
- the user terminal in the license band.
- Each transmission / reception unit 103 converts the downlink signal output from the baseband signal processing unit 104 by precoding for each antenna to a radio frequency band.
- the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 101.
- the transmitter / receiver 103, a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention can be applied.
- the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102, frequency-converted by each transmitting / receiving unit 103, converted into a baseband signal, and sent to the baseband signal processing unit 104. Entered.
- the baseband signal processing unit 104 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing on user data included in the input uplink signal.
- the data is transferred to the higher station apparatus 30 via the interface unit 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the interface unit 106 transmits / receives a signal (backhaul signaling) to / from an adjacent radio base station via an inter-base station interface (for example, optical fiber, X2 interface). Alternatively, the interface unit 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- a signal backhaul signaling
- inter-base station interface for example, optical fiber, X2 interface
- FIG. 15 is a functional configuration diagram of the radio base station 11 according to the present embodiment.
- the following functional configuration is configured by the baseband signal processing unit 104 included in the radio base station 11 and the like. Note that FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 11 also has other functional blocks necessary for wireless communication.
- the radio base station 11 includes a control unit (scheduler) 301, a DL signal generation unit 302, a mapping unit 303, a reception processing unit 304, and an acquisition unit 305.
- the control unit 301 controls scheduling of downlink data signals transmitted on the PDSCH, downlink control signals transmitted on the PDCCH or the extended PDCCH (EPDCCH). It also controls scheduling of system information, synchronization signals, downlink reference signals such as CRS and CSI-RS. When scheduling is performed by one control unit (scheduler) 301 for the license band and the non-license band, the control unit 301 controls transmission of DL signals transmitted in the license band cell and the non-license band cell.
- the control unit 301 controls allocation of radio resources to the downlink signal and the uplink signal based on the instruction information from the higher station apparatus 30 and the feedback information from each user terminal 20. That is, the control unit 301 has a function as a scheduler. A controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention can be applied to the control unit 301.
- the control unit 301 controls transmission of the non-licensed band, it controls transmission of the DL signal of the non-licensed band based on the result of the LBT performed in the non-licensed band.
- the LBT result implemented in the non-licensed band cell is output to the control unit 301.
- the LBT result is notified to the control unit 301 via the backhaul link.
- the reception processing unit 304 can perform LBT and notify the control unit 301 of the LBT result.
- the control unit 301 determines that the channel of the non-licensed band is in an idle state from the measurement result of the received signal strength, and uses the BRS for all candidate symbols after the symbol that has executed the LBT Control to send. In addition, when it is determined that the channel of the non-licensed band is in an idle state, the control unit 301 performs control so that the DL signal is transmitted using the non-licensed band. In addition, the control unit 301 instructs the user terminal 20 to measure (measure) a DL signal transmitted in the non-licensed band using the license band and to feedback the measurement result. Specifically, the control unit 301 instructs the DL signal generation unit 302 to generate information related to a measurement instruction in a non-licensed band and a measurement result feedback instruction.
- the DL signal generation unit 302 generates a DL signal based on an instruction from the control unit 301.
- Examples of the DL signal include a DL data signal, a downlink control signal, and a reference signal.
- the DL signal generation unit 302 includes information related to the measurement instruction in the non-licensed band and the feedback instruction of the measurement result in the downlink control signal transmitted in the license band.
- the mapping unit 303 controls DL signal mapping based on an instruction from the control unit 301.
- the mapping unit 303 functions as a selection unit, and controls the mapping by randomly selecting a symbol that performs LBT from a plurality of candidate symbols with equal probability.
- a mapping circuit or mapper described based on common recognition in the technical field according to the present invention can be applied to the mapping unit 303.
- the reception processing unit 304 performs reception processing such as decoding and demodulation on the UL signal transmitted from the user terminal 20.
- the reception processing unit 304 outputs the measurement result (measurement report) transmitted from the user terminal 20 via the license band to the acquisition unit 305.
- the acquisition unit 305 acquires the measurement result measured in the non-licensed band.
- the acquisition unit 305 outputs a measurement result (measurement report) to the control unit 301, and the control unit 301 can control a non-licensed band cell that transmits DL data to the user terminal based on the measurement result. .
- FIG. 16 is an overall configuration diagram of the user terminal 20 according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. Yes.
- radio frequency signals received by a plurality of transmission / reception antennas 201 are each amplified by an amplifier unit 202, converted in frequency by a transmission / reception unit 203, and converted into a baseband signal.
- the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 204.
- downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 retransmission control (HARQ: Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing, and the like are performed and transferred to each transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band. Thereafter, the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 201.
- the transmission / reception unit 203 can receive DL signals from the license band and the non-license band.
- the transmission / reception unit 203 only needs to be able to transmit UL signals at least for the license band.
- the transmission / reception unit 203 may be configured to be able to transmit a UL signal even for a non-licensed band.
- the transmission / reception unit 203 functions as a reception unit that receives information on a measurement instruction in a non-licensed band or a measurement result feedback instruction using the license band.
- the transmission / reception unit 203 functions as a transmission unit that transmits the result of the RRM measurement or the CSI measurement.
- the transmitter / receiver 203 may be a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention.
- FIG. 17 is a functional configuration diagram of the user terminal 20 according to the present embodiment.
- the following functional configuration is configured by the baseband signal processing unit 204 included in the user terminal 20.
- FIG. 17 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the user terminal 20 includes a control unit 401, a UL signal generation unit 402, a mapping unit 403, a reception processing unit 404, and an acquisition unit 405.
- the control unit 401 controls UL signal transmission processing (such as a measurement result report) to the radio base station 10.
- the control unit 401 detects the beacon reference signal (BRS) of the connected cell
- the control unit 401 recognizes that the channel of the connected cell is in an idle state (LBT idle ) and performs RRM measurement or CSI measurement in the LBT idle subframe. Control to do.
- BRS beacon reference signal
- control unit 401 When the control unit 401 does not detect the beacon reference signal (BRS) of the connected cell, the controller 401 recognizes that the channel of the connected cell is busy (LBT busy ) and performs RRM measurement or CSI measurement in the LBT busy subframe. Control not to. Alternatively, when the control unit 401 does not detect the beacon reference signal (BRS) of the connected cell, the control unit 401 recognizes that the channel of the connected cell is busy (LBT busy ), and performs RRM measurement or CSI in the LBT busy subframe. Control to take measurements.
- BRS beacon reference signal
- a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention is applied to the control unit 401.
- the UL signal generation unit 402 generates a UL signal based on an instruction from the control unit 401.
- the UL signal generation unit 402 includes information on the measurement instruction in the non-licensed band and the feedback instruction of the measurement result in the uplink control signal transmitted in the license band.
- a signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention can be applied to the UL signal generation unit 402.
- the mapping unit 403 controls UL signal mapping based on an instruction from the control unit 401.
- the mapping unit 403 functions as a selection unit, and controls the mapping by randomly selecting a symbol that performs LBT from a plurality of candidate symbols with equal probability.
- the mapping circuit or mapper described based on common recognition in the technical field according to the present invention can be applied to the mapping unit 403.
- the reception processing unit 404 performs reception processing such as decoding and demodulation on the DL signal transmitted in the license band and the non-license band.
- the acquisition unit 405 acquires the measurement result measured in the non-licensed band. Further, the acquisition unit 405 outputs the measurement result (measurement report) to the control unit 401, and the control unit 401 can control the non-licensed band cell that transmits UL data based on the measurement result.
Abstract
Description
本実施の形態では、LBTが設定されない周波数キャリアをライセンスバンド、LBTが設定される周波数キャリアを非ライセンスバンドとして説明するが、これに限られない。すなわち、本実施の形態は、LBTが設定される周波数キャリアであれば、ライセンスバンドまたは非ライセンスバンドにかかわらず適用できる。
非ライセンスバンドでLTEを運用する無線通信システム(LAA)のシナリオとして、キャリアアグリゲーション(CA:Carrier Aggregation)、デュアルコネクティビティ(DC:Dual Connectivity)またはスタンドアローンなどの複数のシナリオが想定される。たとえば、800MHz帯のライセンスバンドを利用するマクロセルと、5GHz帯の非ライセンスバンドを利用するスモールセルと、を設ける場合を想定する。なお、キャリアアグリゲーションやデュアルコネクティビティを適用するセル間では、少なくともカバレッジエリアの一部が重畳するように配置される。
図5は、シナリオ1A,2A(図2参照)における基地局の下りリンクLBTの例を示している。フレーム長は10[ms]であり、少なくとも1つのLBT用スペシャルサブフレームが含まれる。このLBT用スペシャルサブフレームは、既存のTDDのUL-DL構成におけるスペシャルサブフレームとは異なり、新たに定義されたものである。
ビーコン参照信号(BRS)が設定されていない場合、ユーザ端末は各サブフレームに含まれる参照信号、たとえばCRSを検出することで、チャネルのアイドル状態またはビジー状態を識別することができる。たとえば、ユーザ端末がCRSを検出した場合、ユーザ端末はLBTidleを認識する。または、ユーザ端末は、基地局からのデータ送信を認識する。ユーザ端末がCRSを検出しなかった場合、ユーザ端末はLBTbusyを認識する。または、ユーザ端末は、基地局からデータが送信されないことを認識する。
図6Aは、CRSが1[ms]周期で送信される例を示している。フレーム長は10[ms]であり、少なくとも1つのLBT用スペシャルサブフレームが含まれる。ユーザ端末は、LBT用スペシャルサブフレームを除いた9[ms]分のサブフレームでRSSI測定を行う。
図10は、CSI-RSが10[ms]周期で送信される例を示している。フレーム長は10[ms]であり、少なくとも1つのLBT用スペシャルサブフレームが含まれる。ユーザ端末は、CSI-RSが送信されるサブフレームでCSI測定を行う。干渉は、過去の周期の平均干渉値または測定するサブフレームの瞬間干渉値を考える。
ユーザ端末は、LBTbusyを識別した場合またはLBTbusy比がしきい値よりも大きい場合に、他キャリアのための異周波数測定を行ってもよい。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上述の非ライセンスバンドでLTEを運用する無線通信システム(LAA)においてLBTを行う無線通信方法が適用される。
Claims (10)
- LBT(Listen Before Talk)が設定された第1の周波数キャリアを用いて無線基地局と通信可能なユーザ端末であって、
LBTを用いて、接続セルのビーコン参照信号を検出した場合に前記接続セルのチャネルがアイドル状態(LBTidle)であると認識して、LBTidleサブフレームにおいて受信品質を測定するよう制御する制御部と、
前記LBT期間中の前記受信品質を測定した測定結果を取得する取得部と、
前記測定結果を送信する送信部と、を備えることを特徴とするユーザ端末。 - 前記受信品質の測定はRRM測定であることを特徴とする請求項1に記載のユーザ端末。
- 前記受信品質の測定はCSI測定であることを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、接続セルのビーコン参照信号を検出しない場合に前記接続セルのチャネルがビジー状態(LBTbusy)であると認識して、LBTbusyサブフレームにおいて前記受信品質を測定しないよう制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、接続セルのビーコン参照信号を検出しない場合に前記接続セルのチャネルがビジー状態(LBTbusy)であると認識して、LBTbusyサブフレームにおいて前記受信品質を測定するよう制御し、
前記送信部は、2種類の前記測定結果を送信することを特徴とする請求項1に記載のユーザ端末。 - 前記ビーコン参照信号が設定されていない場合、前記制御部は、接続セルのセル固有参照信号(CRS)を検出した場合に、前記接続セルのチャネルがアイドル状態(LBTidle)であると認識することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、前記接続セルのチャネルがアイドル状態(LBTidle)であると認識した場合、物理下りリンク制御チャネルを受信するよう制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、前記接続セルのチャネルがビジー状態(LBTbusy)であると認識した場合、LBTが設定された別の周波数キャリアのキャリアまたはセルをサーチするよう制御することを特徴とする請求項1に記載のユーザ端末。
- LBT(Listen Before Talk)が設定された第1の周波数キャリアを用いて無線基地局と通信可能なユーザ端末を有する無線通信システムであって、
前記ユーザ端末は、
LBTを用いて、接続セルのビーコン参照信号を検出した場合に前記接続セルのチャネルがアイドル状態(LBTidle)であると認識して、LBTidleサブフレームにおいて受信品質を測定するよう制御する制御部と、
前記LBT期間中の前記受信品質を測定した測定結果を取得する取得部と、
前記測定結果を送信する送信部と、を備えることを特徴とする無線通信システム。 - LBT(Listen Before Talk)が設定された第1の周波数キャリアを用いて無線基地局と通信可能なユーザ端末の無線通信方法であって、
LBTを用いて、接続セルのビーコン参照信号を検出した場合に前記接続セルのチャネルがアイドル状態(LBTidle)であると認識して、LBTidleサブフレームにおいて受信品質を測定するよう制御する工程と、
前記LBT期間中の前記受信品質を測定した測定結果を取得する工程と、
前記測定結果を送信する工程と、を備えることを特徴とする無線通信方法。
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WO2016121608A1 (ja) * | 2015-01-30 | 2016-08-04 | 京セラ株式会社 | 基地局及びユーザ端末 |
WO2016121609A1 (ja) * | 2015-01-30 | 2016-08-04 | 京セラ株式会社 | ユーザ端末及び基地局 |
JP2019062542A (ja) * | 2015-01-30 | 2019-04-18 | 京セラ株式会社 | ユーザ端末、通信方法及び通信システム |
JPWO2016121608A1 (ja) * | 2015-01-30 | 2017-11-24 | 京セラ株式会社 | 基地局及びユーザ端末 |
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JP2019522405A (ja) * | 2016-05-27 | 2019-08-08 | 北京佰才邦技術有限公司Baicells Technologies Co. Ltd. | 無線リンク品質の測定方法および端末 |
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Also Published As
Publication number | Publication date |
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CN106664587A (zh) | 2017-05-10 |
US20170265095A1 (en) | 2017-09-14 |
US10841823B2 (en) | 2020-11-17 |
EP3177061A1 (en) | 2017-06-07 |
EP3177061B1 (en) | 2020-02-26 |
JPWO2016017328A1 (ja) | 2017-06-01 |
EP3177061A4 (en) | 2018-04-04 |
JP6174265B2 (ja) | 2017-08-02 |
CN106664587B (zh) | 2020-05-19 |
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