WO2011039969A1 - 無線通信装置、無線通信基地局及び無線通信システム - Google Patents
無線通信装置、無線通信基地局及び無線通信システム Download PDFInfo
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- WO2011039969A1 WO2011039969A1 PCT/JP2010/005703 JP2010005703W WO2011039969A1 WO 2011039969 A1 WO2011039969 A1 WO 2011039969A1 JP 2010005703 W JP2010005703 W JP 2010005703W WO 2011039969 A1 WO2011039969 A1 WO 2011039969A1
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Definitions
- the present invention relates to a radio communication apparatus, a radio communication base station, and a radio communication system that can communicate by using each component carrier of a plurality of communication cells simultaneously by carrier aggregation.
- the standardization organization 3GPP (The 3rd Generation Generation Partnership Project) is promoting standardization of LTE (Long Term Term Evolution) as the next generation communication standard of W-CDMA (Wideband Code Division Multiple Access) (for example, Non-Patent Document 1). To 3).
- a wireless communication base station (E-UTRAN NodeB (eNB)) of a network (Evolved Universal Terrestrial Radio Access Network (E-UTRAN)) has a plurality of communication cells.
- a wireless communication terminal (User Equipment (UE)) belongs to one of the communication cells.
- the radio communication base station eNB
- base station the communication cell
- cell the communication terminal
- UE the radio communication terminal
- the state of the terminal includes an idle state (RRC_IDLE) in which a radio bearer (RadioerBearer) for transmitting / receiving data to / from the base station is not established, and a connected state (RRC_CONNECTED) in which a radio bearer is established with the base station. is there.
- RRC_IDLE an idle state
- RRC_CONNECTED a connected state
- the connected terminal monitors the radio wave condition and reports the fluctuation of the radio wave condition to the base station in order to prevent communication interruption due to the fluctuation of the radio wave condition of the component carrier in use.
- There are two types of reports on radio wave status changes from a terminal to a base station one performed in an RRC (Radio Resource Control) layer and one performed in a physical layer.
- the report performed in the RRC layer is used to change communication between a terminal and a connected cell to communication with another adjacent cell.
- a report performed in the physical layer is called a CQI (Channel Quality Indicator) report, and is used for monitoring a transmission rate and controlling transmission power of communication performed between a terminal and a base station.
- CQI Channel Quality Indicator
- the terminal receives the measurement of the reference signal (Measurement Configuration) (hereinafter simply referred to as “Measurement Configuration”) included in the RRC connection reconfiguration (RRC Connection Reconfiguration) sent from the base station.
- the terminal measures the received radio wave condition (reception power or reception quality) based on the measurement setting.
- an event for sending a measurement result for example, a change in an event such as the reception power exceeds a set threshold value
- the terminal is connected to a base station (hereinafter referred to as “Source eNB” or “source base”).
- a measurement result report (Measurement Report (MR)).
- the terminal When the terminal measures the received radio wave condition at the same frequency as the carrier frequency being used (Measurement), the terminal can perform the measurement (Measurement) while receiving data from the component carrier in use. However, when measuring the received radio wave status at a carrier frequency different from the carrier frequency being used, the terminal monitors a carrier frequency other than the carrier frequency being used while monitoring the component carrier being used. When the terminal does not have the capability (Capability), it is necessary to temporarily stop data reception from the carrier frequency being used and monitor the carrier frequency to be measured. The period during which data reception is temporarily stopped is called “MeasurementMeasureGap”. The setting of Measurement Gap is notified from the base station to the terminal as control information.
- the measurement settings for causing the terminal to measure the reception power and reception quality include the following information and the like.
- Measurement identifier Measurement Identities (MeasID)
- Measurement object Measurement Object (MeasObject)
- -Quantity configuration Quantantity Configuration (QuantityConfig)) showing the filtering operation of measurement results
- Reporting Configuration ReportConfig
- Measurement gap indicating the period during which data is not transmitted / received to measure the received radio wave conditions at other frequencies or other systems Among these pieces of information, the measurement identifier (MeasID), the measurement target (MeasObject), and the report setting (ReportConfig) are linked information.
- FIG. 18 is a diagram showing an example of measurement settings.
- the measurement setting is configured by a combination of a measurement object identifier (MeasObjectID) and a report setting identifier (ReportConfigID).
- the measurement object identifier (MeasObjectID) is an identifier indicating the measurement object (MeasObject).
- the report setting identifier (ReportConfigID) is an identifier indicating the report setting (ReportConfig).
- FIG. 19 is a diagram illustrating an example of a measurement target (MeasObject).
- the measurement target (MeasObject) includes a downlink carrier frequency (EUTRA-DL-CarrierFreq), a measurement bandwidth (MeasurementBandwidth), a frequency offset (OffsetFreq), and a deletion list (CellsToRemoveList) from the neighboring cell list. ), An additional modification list to neighboring cells (NeighbourCellsToAddModifyList), a removal list from the blacklist cell list (BlacklistedCellsToRemoveList), and an additional modification list to the blacklist cell (BlacklistedCellsToAddModifyList).
- ReportConfig is the measurement result report (MR) trigger type, trigger quantity (Trigger ⁇ Quantity), report quantity (Report Quantity), maximum number of cells to report, report cycle and report amount (Report Amount) ) Etc.
- the types of triggers include those that are sent when an event occurs (event trigger reporting), those that are sent periodically (periodic reporting), and those that are sent periodically after an event occurs (event trigger periodic reporting).
- E-UTRAN event types include, for example, serving cell higher than threshold, serving cell lower than threshold, neighboring cell better than serving cell, neighboring cell higher than threshold, serving cell lower than threshold 1 There are five types where the cell is higher than threshold 2.
- the structure of the measurement result report (MR) varies depending on what is measured.
- the constituent elements of the measurement result report (MR) differ depending on whether the cell of E-UTRA is measured or a radio access technology (Radio Access Technology (RAT)) different from E-UTRA is measured.
- RAT Radio Access Technology
- FIG. 20 is a diagram illustrating an example of a measurement result report (MR).
- the measurement result report is composed of the components shown in FIG.
- the measurement identifier (MeasID)
- RSRP Reference Signal Received Power
- RSSI Reference Signal Received Quality
- the measurement result report is adjacent to the maximum number of reportable cells (MaxReportCells) included in the measurement settings that satisfy the event.
- the information of the cell is included in the next part of the head part.
- the information on the neighboring cell includes a physical cell identifier (Physical Cell Identity (PCI)).
- the information on the neighboring cell may optionally include a cell global identifier (Cell Global Identity (CGI)), a tracking area code (Tracking Area Code), and a PLMN identifier list (Public Land Mobile Network Identity List).
- the neighbor cell information may optionally include reference signal reception power (RSRP) or reference signal reception quality (RSRQ). Which information of RSRP or RSRQ is included is described in the measurement settings.
- RSRP reference signal reception power
- RSRQ reference signal reception quality
- the value of the component of the measurement result report varies depending on the purpose of the measurement.
- the purpose is to search for the best cell, the configuration of the measurement result report (MR) is as described above.
- the purpose is SON, a restriction condition is added that it is a measurement result report of a radio access technology (RAT) different from E-UTRA, and that one cell is to be reported.
- RAT radio access technology
- the purpose is a CGI report
- a measurement result report including CGI of an adjacent cell as an option is used. However, when the CGI of an adjacent cell cannot be measured, the restriction is exempted.
- the terminal performs the measurement indicated by the measurement identifier (MeasID) and sends a measurement result report (MR) to the base station. Based on the measurement result report (MR), the base station determines whether or not to change the cell, and to which cell to change if the cell is changed. When changing the cell, the base station starts the procedure.
- the measurement identifier MeasID
- MR measurement result report
- the terminal receives the CQI report setting included in the individual physical layer of the individual radio resource setting (Radio Resource Config Dedicated) included in the RRC connection reconfiguration (RRC Connection Reconfiguration) sent from the base station. Based on the CQI report setting, the terminal measures a reference signal and creates a CQI report.
- the bands that are subject to CQI reporting include a wideband and a subband. In the case of a wideband, one CQI report is sent in the wideband, and in the case of a subband, a CQI report is sent for each subband. In the case of subbands, there are a method for sending CQI reports for all subbands instructed by the base station and a method for sending CQI reports for subbands selected by the terminal.
- the connected terminal confirms whether it is synchronized with the cell.
- the terminal determines that the radio link is broken, and reestablishes the RRC connection with another cell. The detailed operation of the terminal will be described below.
- the physical layer of the terminal monitors the quality of the downlink radio link of the connected cell, and the RRC layer, which is the upper layer of the terminal, is in-sync or out-of-sync To tell.
- discontinuous reception discontinuous Reception:
- DRX discontinuous Reception:
- the physical layer of the terminal assesses the quality of the radio link at least once every intermittent reception period. If discontinuous reception is not set, the physical layer of the terminal assesses the quality of the radio link for each radio frame.
- the physical layer of the terminal communicates out-of-sync to the RRC layer when the quality of the radio link is worse than the threshold Qout.
- the physical layer of the terminal reports in-sync to the RRC layer.
- the RRC layer of the terminal is disconnected from the base station or the base station based on the out-of-sync or in-sync assessment result sent from the physical layer of the terminal , Determine whether it is maintained. As shown in FIG. 21, when the terminal RRC layer receives out-of-sync from the terminal physical layer for a predetermined number of times N310, a physical layer failure (Physical Layer Problem: PPL) has occurred. And the first operation of the timer is started. The terminal RRC layer determines that it has recovered from the PLP when it receives N311 consecutively in-sync from the physical layer of the terminal within a predetermined period T310 from the first operation of the timer, for a predetermined number of times. Stop operation.
- PPL Physical Layer Problem
- the RRC layer of the terminal determines that RLF (Radio Link Failure) has occurred and starts the second operation of the timer.
- the terminal temporarily suspends all radio bearers except signaling radio bearer No. 0 (Signaling Radio Bearer 0 (SRB0)).
- the terminal performs cell selection (cell ⁇ ⁇ selection) in order to search for a cell for attempting R-RC connection re-establishment (re-establishment) with another cell during a predetermined period T311 from the second operation of the timer. Do. If the terminal does not find a cell for attempting to re-establish RRC connection during a predetermined period T311, the terminal enters an idle state.
- the terminal When the terminal finds a cell for attempting RRC connection re-establishment during the predetermined period T311, the terminal stops the second operation of the timer and starts the third operation of the timer. The terminal tries to re-establish RRC connection during a predetermined period T301 from the third operation of the timer. If the terminal does not complete RRC connection re-establishment during a predetermined period T301, the terminal enters an idle state. If the RRC connection re-establishment is successful during the predetermined period T301, the terminal switches the connection to the cell and stops the timer operation.
- Discontinuous reception includes “shortDRX” and “LongDRX”.
- the difference between shortDRX and LongDRX is whether the period during which data is not received is short or long.
- the terminal performs the shortDRX operation.
- the terminal shifts to the Long DRX if data reception is not performed for a certain period during the short DRX operation.
- 3GPP TS36.331 v8.4.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC)” 3GPP TS36.300 v8.7.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2” 3GPP TS25.331 v8.5.0, “Radio Resource Control (RRC); Protocol specification” 3GPP TSG-RAN WG2 Meeting # 66bis, R2-093872, “Radio link monitoring in a multicarrier setting”
- LTE-A Long Term Evolution Advanced
- LTE-A Long Term Evolution Advanced
- carrier aggregation is also called band aggregation.
- 22 (a) and 22 (b) are diagrams showing examples of carrier aggregation.
- 22A and 22B among the six component carriers whose carrier frequencies are f1, f2, f3, f4, f5, and f6, respectively, the carrier frequencies are f1, f2, f3, and f6, respectively.
- An example in which a terminal uses four component carriers at the same time is shown.
- the use of a plurality of component carriers is expected to improve the throughput of communication between the terminal and the base station.
- RLF when a terminal uses a plurality of component carriers will be described. If the above-described background art is applied as it is, the terminal performs RRC connection re-establishment operation when detecting PLP and determining RLF in one component carrier. However, when the terminal uses a plurality of component carriers, other component carriers can be used even if PLP occurs in one component carrier. Even in such a situation, if the terminal performs the RRC connection re-establishment operation, in addition to the deterioration of the terminal connectivity, the terminal searches for other component carriers, leading to waste of power consumption.
- Non-Patent Document 4 there is a method in which a terminal notifies a base station of a component carrier in which PLP has occurred using a measurement result report.
- the base station determines whether to instruct the terminal to perform handover to another cell or change the component carrier.
- the base station cannot make the determination. Even if the base station sends a measurement setting to the terminal so as to send a measurement result report of another component carrier, if the terminal does not want to perform handover or change of the component carrier, those operations are wasted. . In this case, power consumption of the terminal and wireless resources are wasted.
- Non-Patent Document 4 also describes a method by which the base station determines that PLP has occurred in a component carrier for which a CQI report is missing.
- carrier aggregation is performed between the terminal and the base station, some component carriers cannot be changed only by using the CQI report.
- the present invention is a radio communication apparatus capable of communicating with the radio communication base station by simultaneously using each component carrier of a plurality of communication cells managed by the radio communication base station, from the radio communication base station to each communication cell.
- a reception unit that receives the transmitted reference signal, a radio wave state determination unit that determines a reception radio wave state of the wireless communication device based on the reference signal received by the reception unit, and a determination result by the radio wave state determination unit Based on a report creation unit that creates a report to be transmitted to the radio communication base station, and a transmission unit that transmits the report to the radio communication base station.
- a physical layer failure determination unit that determines the occurrence of a physical layer failure for each component carrier that is used or can be used in communication between the wireless communication base stations; Which component carrier has a physical layer failure when the physical layer failure determination unit determines that a physical layer failure has occurred in some of a plurality of component carriers used in communication between wireless communication base stations
- the report creation unit provides a wireless communication apparatus that creates a report according to a component carrier in which a physical layer failure has occurred and a predetermined determination criterion.
- the report creation unit includes a monitoring carrier determination unit that determines a component carrier that can be used instead of a component carrier in which a physical layer failure has occurred, and the plurality of communication cells managed by the wireless communication base station
- a measurement setting generation unit configured to generate a measurement setting for setting a measurement of a reference signal in at least one component carrier, and when there is a measurement setting of the component carrier determined by the monitoring carrier determination unit, the measurement Based on the measurement results using the settings, determine whether the component carrier is usable, and if it is usable, report the measurement result of the component carrier and the measurement result of the component carrier where the physical layer failure has occurred. Generated and determined by the monitoring carrier determination unit If there is no measurement settings of the carrier, it instructs the measurement setting generation unit to generate a measurement configuration of the component carrier.
- the report creation unit may detect the physical layer failure when a physical layer failure has occurred in some of a plurality of component carriers used in communication between the wireless communication device and the wireless communication base station.
- the determination unit determines, based on the predetermined determination criterion, the received radio wave status of the component carrier in which the physical layer failure has occurred is monitored, or the received radio waves of component carriers other than the component carrier in which the physical layer failure has occurred. If the monitoring determination unit that determines whether to monitor the status and the monitoring determination unit determine to monitor the reception radio wave status of the component carrier in which the physical layer failure has occurred, create a report in which the measurement result of the component is missing.
- the own carrier monitoring mode report generation unit and the monitoring determination unit The other carrier monitoring mode report creating unit that creates a report including the measurement result of the component and the measurement result of the component carrier in which the physical layer failure has occurred when it is determined to monitor the reception radio wave status of the component other than the carrier. Have.
- the predetermined determination criterion is the capability of the wireless communication device.
- the other carrier monitoring mode report creation unit includes a monitoring carrier determination unit that determines a component carrier that can be used instead of a component carrier in which a physical layer failure has occurred, and the wireless communication base station manages the monitoring carrier determination unit
- a measurement setting generation unit that generates a measurement setting for setting measurement of a reference signal in at least one component carrier of a plurality of communication cells, and there is a measurement setting of the component carrier determined by the monitoring carrier determination unit In this case, it is determined whether the component carrier can be used based on the measurement result using the measurement setting.
- the measurement result of the component carrier and the measurement result of the component carrier in which the physical layer failure has occurred And generating a report including the monitoring carrier determination unit If there is no measurement settings boss was a component carrier, instructing the measurement setting generation unit to generate a measurement configuration of the component carrier.
- the own carrier monitoring mode report creating unit changes the reception period of the reference signal by the receiving unit according to the reception radio wave status of a component carrier serving as a reference in the plurality of component carriers.
- an area information management unit that manages the size of the communication cell used by the wireless communication device based on the information on the size of the communication cell transmitted from the wireless communication base station;
- a deactivation monitoring unit that monitors at least one of the component carriers that are set to measure the reference signal among the component carriers notified from the radio communication base station to be activated.
- the activation monitoring unit when there is a component carrier to be monitored, when the area of the monitored component carrier is smaller than the area of the component carrier notified from the wireless communication base station, Component carrier notified from communication base station Switch to A.
- the deactivation monitoring unit when the deactivation monitoring unit is monitoring the component carrier notified from the wireless communication base station to be activated, if there is no other component carrier that has been measured and set to be deactivated, the monitoring is performed. If there is another component carrier that has been set and deactivated, the component carrier larger than the size of the monitored component carrier is monitored.
- the present invention is a radio communication base station capable of communicating with the radio communication apparatus using each component carrier of a plurality of communication cells at the same time, and a receiving unit that receives a report transmitted from the radio communication apparatus, From the report, a physical layer failure determination unit that determines whether a physical layer failure has occurred in some of a plurality of component carriers used in communication between the wireless communication device and the wireless communication base station, and the physical layer When the determination result by the failure determination unit indicates that a physical layer failure has occurred in a part of the plurality of component carriers, a control unit that temporarily stops assignment of radio resources to the component carrier in which the physical layer failure has occurred And a transmission unit that transmits a reference signal to the wireless communication device.
- the wireless communication base station determines that the wireless communication device is requesting to add the component carrier when the report includes information on component carriers other than the plurality of component carriers.
- the present invention is a wireless communication system in which a wireless communication apparatus can communicate with the wireless communication base station by simultaneously using each component carrier of a plurality of communication cells managed by the wireless communication base station, and the wireless communication apparatus includes: A receiving unit that receives a reference signal transmitted from the wireless communication base station for each communication cell; and a radio wave state determining unit that determines a received radio wave state of the wireless communication device based on the reference signal received by the receiving unit; A report generating unit that generates a report to be transmitted to the radio communication base station based on a determination result by the radio wave state determination unit; and a transmission unit that transmits the report to the radio communication base station.
- the situation determination unit is a physical layer that determines the occurrence of a physical layer failure for each component carrier that is used or can be used in communication between the wireless communication device and the wireless communication base station.
- the physical layer failure determination unit has determined that a physical layer failure has occurred in some of a plurality of component carriers used in communication between the wireless communication device and the wireless communication base station. In this case, it is notified to which report carrier the physical layer failure has occurred, the report creation unit creates a report according to the component carrier in which the physical layer failure has occurred and a predetermined criterion,
- the wireless communication base station includes a receiving unit that receives a report transmitted from the wireless communication device, and a plurality of component carriers that are used in communication between the wireless communication device and the wireless communication base station from the report.
- a physical layer failure determination unit that determines whether a physical layer failure has occurred in part, and a determination result by the physical layer failure determination unit is included in a part of the plurality of component carriers.
- a control unit that temporarily stops radio resource allocation to the component carrier in which the physical layer failure has occurred, and a transmission unit that transmits a reference signal to the wireless communication device, A wireless communication system is provided.
- the wireless communication device According to the wireless communication device, the wireless communication base station, and the wireless communication system according to the present invention, it is possible to suppress waste of radio resources and waste of power consumption.
- FIG. 1 is an overall configuration diagram of a wireless communication system according to an embodiment.
- (A)-(d) is a schematic diagram which shows the some cell which the base station of one Embodiment manages Block diagram of a terminal constituting the wireless communication system of the first embodiment Block diagram of a base station constituting the wireless communication system of the first embodiment
- FIG. 2 is a block diagram showing terminals constituting a wireless communication system according to a second embodiment.
- FIG. 4 is a block diagram showing terminals constituting a wireless communication system according to a third embodiment.
- (A) And (b) is a figure which shows the example which shifts a radio frequency bandwidth to the direction opposite to the position where the component carrier in which PLP generate
- wireless communications system of 3rd Embodiment The flowchart for demonstrating operation
- a block diagram showing terminals constituting a wireless communication system according to a fourth embodiment A block diagram showing terminals constituting a wireless communication system of a fifth embodiment
- a block diagram showing terminals constituting a wireless communication system according to a sixth embodiment Flowchart for explaining the operation of the deactivation monitoring unit 616 when notified that the component carrier has been deactivated
- Block diagram of a base station constituting the wireless communication system of the sixth embodiment Diagram showing an example of measurement settings Diagram showing an example of a measurement target (MeasObject) Diagram showing an example of a measurement result report (MR) Flow chart when the terminal determines the occurrence of PLP (Physical Layer Problem) or RLF (Radio Link Failure) (A) And (b) is a figure which shows the example of a carrier aggregation
- the wireless communication system includes a wireless communication base station and a wireless communication terminal that can communicate via a wireless communication network.
- the radio communication base station is simply referred to as “base station”, and the radio communication terminal is simply referred to as “terminal”.
- first to fifth embodiments will be described. First, parts common to the first to fifth embodiments will be described, and then each of the first to fifth embodiments will be described. A characteristic part will be described. In the first to fifth embodiments, components having the same function are denoted by the same reference numerals, and redundant description is omitted.
- the wireless communication system is composed of a plurality of terminals and a plurality of base stations.
- each base station constitutes a plurality of communication cells.
- a communication cell refers to an identifier assigned to a geographical area from one base station or a radio network object that can be uniquely identified by a terminal based on a difference in frequency used in the geographical area. .
- a communication cell is simply referred to as a “cell”.
- the terminal is, for example, a mobile phone, and the base station is a base station of a mobile phone.
- the terminal is not limited to the mobile phone, and the base station is not limited to the base station of the mobile phone.
- the wireless communication system uses LTE or LTE-A mobile communication technology standardized by 3GPP (The 3rd Generation Generation Partnership Project).
- the mobile communication technology used by the wireless communication system is not limited to the above standards, and WiMAX (Worldwide Interoperability for Microwave Access) such as wireless LAN (Wireless Local Area Network), IEEE802.16, IEEE802.16e, IEEE802.16m, It may be 3GPP2, SAE (System Architecture Evolution), or the fourth generation mobile communication standard.
- a wireless communication system in which a base station and a terminal can communicate using at least one of component carriers of a plurality of carrier frequencies (for example, six frequencies f1, f2, f3, f4, f5, and f6) will be described as an example.
- a single base station forms a plurality of cells for each of a plurality of carrier frequencies.
- FIG. 1 is an overall configuration diagram of a wireless communication system according to an embodiment.
- a terminal can communicate with one base station by carrier aggregation using each component carrier of a plurality of cells simultaneously.
- the left terminal performs carrier aggregation by simultaneously using the component carrier of cell 1 (carrier frequency is f1) and the component carrier of cell 4 (carrier frequency is f2).
- the right terminal performs carrier aggregation by using the component carrier of cell 3 (carrier frequency is f1) and the component carrier of cell 6 (carrier frequency is f2) simultaneously.
- this wireless communication system may include a terminal that does not have a carrier aggregation function or does not perform carrier aggregation, such as a central terminal.
- the central terminal communicates with the base station using the component carrier of cell 2 (carrier frequency is f1).
- FIGS. 2A to 2D are schematic diagrams showing a plurality of cells managed by the base station according to the embodiment.
- each component carrier of a plurality of cells is used at the same time, but there are various modes for combinations of a plurality of cells to be used.
- one base station corresponds to three cells (cell 1, cell 2, cell 3) corresponding to the carrier frequency f1 and to the carrier frequency f2.
- Three cells are managed.
- FIG. 2A As a mode of simultaneously using a plurality of component carriers of different carrier frequencies belonging to the same base station, as shown in FIG. 2A, a plurality of component carriers of different carrier frequencies belonging to the same geographical area of the same base station are simultaneously used. In some cases, as shown in FIG. 2B, a plurality of component carriers having different carrier frequencies belonging to different geographical areas of the same base station may be used simultaneously. Also, as shown in FIG. 2C, carrier aggregation is possible even when managing cells of different geographical sizes at different carrier frequencies of the same base station. Furthermore, as shown in FIG. 2D, a plurality of component carriers having the same carrier frequency belonging to different geographical areas of the same base station may be used at the same time.
- carrier aggregation it is not limited to the case where a plurality of component carriers having different carrier frequencies are used at the same time as shown in FIGS. 2A to 2C, but a plurality of carrier frequencies having the same carrier frequency as shown in FIG. Including the case where component carriers are used at the same time, this is called “carrier aggregation”.
- the carrier aggregation described above is merely an example. That is, the number of cells that can be used at the time of carrier aggregation is not limited to the examples shown in FIGS. 2 (a) to 2 (d). Moreover, even at the time of carrier aggregation, depending on the situation, only one cell may be used.
- the multiple component carriers used for carrier aggregation are “backward compatible carrier (also called backward compatible carrier)", “non-backward compatible carrier (Non-backward “Compatible Carrier, also referred to as non-backward compatible component carrier)” and “Extension Carrier (also referred to as Extension Carrier, extension component carrier)”.
- backward compatible carrier also called backward compatible carrier
- non-backward compatible carrier Non-backward “Compatible Carrier, also referred to as non-backward compatible component carrier
- Extension Carrier also referred to as Extension Carrier, extension component carrier
- the backward compatible carrier is a carrier that can be accessed by all existing terminals that support LTE.
- the terminal can connect to the base station using only this carrier (ie, the terminal can use this carrier standalone).
- the backward compatible carrier can also be used as a part of the carrier aggregation carrier.
- a non-backward compatible carrier can connect a terminal that defines this carrier, but cannot connect a terminal that does not define this carrier. Also, if non-backward compatibility begins with a period of overlap, the terminal can connect to the base station using only this carrier (ie, the terminal can use this carrier standalone). . Further, the non-backward compatible carrier can also be used as a part of the carrier aggregation.
- Extension carrier cannot be used as a stand-alone and is configured with a carrier that can be used as a stand-alone. That is, the extension carrier is a part of the component carrier set.
- the first type only a plurality of backward compatible carriers are used.
- the second type uses one or more backward compatible carriers and one or more non-backward compatible carriers.
- the third type uses one or more backward compatible carriers and one or more extension carriers.
- the fourth type uses one or more backward compatible carriers, one or more non-backward compatible carriers, and one or more extension carriers.
- only a plurality of non-backward compatible carriers are used.
- the sixth type uses one or more non-backward compatible carriers and one or more extension carriers.
- An anchor carrier is a carrier necessary for a terminal to establish a connection with a base station, and is one for each terminal. That is, the terminal maintains the connection with the base station using the anchor carrier.
- the type of carrier aggregation can be divided as described above.
- the anchor carrier may be selected from a backward compatible carrier, may be selected from a non-backward compatible carrier, or may be selected from either a backward compatible carrier or a non-backward compatible carrier. Good.
- the anchor carrier When the anchor carrier is disconnected, the anchor carrier may be switched to another backward compatible carrier or a non-backward compatible carrier used by the terminal.
- the number of anchor carriers may be one for each band.
- PDCCH Physical Downlink ⁇ Control CHannel
- PDCCH Physical Downlink ⁇ Control CHannel
- PDCCH is used for each component carrier.
- one PDCCH is used for a plurality of carriers used as a set.
- control information for data sent on the extension carrier is also included in the PDCCH sent on the backward compatible carrier.
- control information of data sent on the extension carrier is also included in the PDCCH sent on the non-backward compatible carrier.
- the control information of the component carrier used by the terminal is included in the PDCCH transmitted by the anchor carrier. Also by this method, the same effect as the second method can be obtained.
- the broadcast information is control information necessary for the terminal to operate, and is control information sent from the base station to the terminal. There are several possible methods.
- broadcast information is broadcast for each component carrier.
- broadcast information necessary for the terminal to connect is broadcasted, and in the extension carrier, carrier-specific broadcast information is broadcasted.
- the backward compatible carrier when a backward compatible carrier and an extension carrier are used as a set, the backward compatible carrier broadcasts broadcast information necessary for the terminal to connect, and the extension carrier allows the terminal to connect. Necessary notification information is notified.
- the non-backward compatible carrier when using a non-backward compatible carrier and an extension carrier as a set, the non-backward compatible carrier broadcasts the broadcast information necessary for the terminal to connect and the broadcast information of the extension carrier together, and the extension carrier Then, notification information is not notified.
- broadcast information necessary for the terminal to connect and broadcast information of these carriers and a set of extension carriers are broadcast, and in the extension carriers, Broadcast information is not broadcast.
- the wireless communication system according to the first embodiment includes a terminal and a base station.
- a terminal receives a reference signal transmitted from a base station on a downlink basis for each cell, and uses a measurement result derived based on a predetermined calculation formula as a measurement result report.
- a function to report to the base station in the uplink is provided.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 3 is a block diagram of terminals constituting the wireless communication system according to the first embodiment.
- the terminal 100 according to the first embodiment includes a reception unit 101, a report control unit 103, a control unit 105, and a transmission unit 107.
- the reception unit 101 receives broadcast information, individual control information, a reference signal, or the like transmitted from a base station that manages a cell in use by the terminal 100 or another cell. Receive.
- the receiving unit 101 outputs broadcast information, individual control information, and the like to the control unit, and outputs a reference signal to the report control unit 103.
- the report control unit 103 controls the measurement of the reference signal based on the CQI report setting (CQI report config) and the measurement setting (Measurement Configuration) input from the control unit 105. Further, the report control unit 103 instructs the reception unit 101 to measure the reference signal. Further, the report control unit 103 determines the received radio wave status based on the reference signal input from the receiving unit 101.
- the report control unit 103 includes a radio wave condition determination unit 111 and a report creation unit 113.
- the radio wave condition determination unit 111 includes a PLP determination unit 115.
- the PLP determination unit 115 determines, for each component carrier in use by the terminal 100, whether the component carrier is synchronized with the base station. Hereinafter, processing when the PLP determination unit 115 performs the determination will be described.
- the PLP determination unit 115 continuously receives out-of-sync sent from the physical layer for a predetermined number of times N310 when the quality of the radio link is lower than the period threshold Qout defined in the physical layer.
- the first operation of a timer (not shown) is started.
- the PLP determination unit 115 performs synchronization (in-sync) sent from the physical layer when the quality of the radio link is higher than the period threshold Qin determined in the physical layer within a predetermined period T310 from the first operation of the timer. ) Is continuously received N311 for a predetermined number of times, the timer operation is stopped.
- the PLP determination unit 115 determines that the component carrier has failed in the physical layer when a predetermined period T310 elapses without being continuously transmitted in-sync from the physical layer a predetermined number of times N311 while the timer is operating.
- N310 and T310 may set different values for each component carrier.
- the PLP determination unit 115 determines that PLP has occurred when a predetermined period T310 has elapsed after receiving out-of-sync for a predetermined number N310 consecutively.
- the determination method that PLP has occurred may be a method other than the above as long as it can be determined that data transmission or reception cannot be performed in the component carrier.
- the PLP determination unit 115 notifies the radio wave condition determination unit 111 of the component carrier determined to be PLP.
- the PLP determination unit 115 may determine that a component carrier that is affected by the component carrier in which PLP occurs and cannot receive data is also a PLP. For example, when PLP occurs in a backward compatible carrier or a non-backward compatible carrier, the PLP determination unit 115 may determine that the extension carrier used in combination with the component carrier is also a PLP.
- a set means that when there are component carrier A and component carrier B, at least a part of information necessary for receiving data from component carrier B is received from component carrier A. When these connections are cut off, these component carriers A and B cannot receive data from the component carrier B.
- Information necessary to receive data refers to broadcast information or PDCCH.
- the PLP determination unit 115 determines that PLP has occurred in the backward compatible carrier, and other back compatible carriers. It is determined that no PLP has occurred in the word compatible carrier. In addition, when PLP occurs in a plurality of backward compatible carriers, the PLP determination unit 115 determines that PLP has occurred in those backward compatible carriers, and that no PLP has occurred in any other backward compatible carrier. judge.
- the PLP determination unit 115 performs PLP on the backward compatible carrier. Is determined, and it is determined that no PLP has occurred in other component carriers. Further, when PLP occurs in a non-backward compatible carrier, the PLP determination unit 115 determines that PLP has occurred in that non-backward compatible carrier, and determines that no PLP has occurred in other component carriers. .
- the PLP determination unit 115 determines the backward compatible carrier and the backward compatible carrier. It is determined that PLP has occurred in the extension carrier used as a set with the compatible carrier, and it is determined that PLP has not occurred in the other component carriers. When PLP occurs in the extension carrier, the PLP determination unit 115 determines that PLP has occurred in the extension carrier.
- the PLP determination unit 115 determines that PLP has occurred in the backward compatible carrier and the extension carrier used as a set with the backward compatible carrier, and it is determined that PLP has not occurred in the other component carriers.
- the PLP determination unit 115 determines that PLP has occurred in the non-backward compatible carrier and an extension carrier used as a set with the non-backward compatible carrier. It is determined that PLP is not generated in the component carriers other than those.
- the PLP determination unit 115 determines that PLP has occurred in the extension carrier, and determines that no PLP has occurred in other component carriers.
- the PLP determination unit 115 determines that PLP has occurred in the non-backward compatible carrier, and other non-backward compatible carriers. It is determined that no PLP has occurred in the backward compatible carrier.
- the PLP determination unit 115 includes the non-backward compatible carrier, It is determined that PLP has occurred in the extension carrier used as a set with the non-backward compatible carrier, and it is determined that PLP has not occurred in other component carriers.
- the PLP determination unit 115 determines that PLP has occurred in that extension carrier, and determines that no PLP has occurred in other component carriers.
- the PLP determination unit 115 determines that the component carrier that has determined that PLP has occurred in each type is the component carrier in which PLP has occurred, and PLP has occurred. It is determined that a component carrier that has not been determined as a component carrier in which no PLP has occurred.
- the downlink is described, but the same can be applied to the uplink.
- the downlink and the uplink do not always correspond one-to-one, and for example, one uplink is assigned to two downlinks. Therefore, mapping is performed as to which downlink corresponds to which uplink.
- an uplink for transmitting an ACK (Acknowledgement) or NACK (Negative Acknowledgment) for data received on the downlink is determined, and a downlink for receiving an ACK or NACK for data transmitted on the uplink is determined.
- the PLP determination unit 115 may determine that the uplink is PLP.
- the PLP determination unit 115 determines that PLP has occurred in all of the component carriers (for example, backward compatible carrier and non-backward compatible carrier) that determine PLP among the downlink corresponding to the uplink.
- the PLP determination unit 115 determines that PLP has also occurred in the corresponding uplink.
- the PLP determination unit 115 may determine that the downlink is PLP. At this time, when the PLP determination unit 115 determines that PLP has occurred in all of the component carriers (for example, backward compatible carrier and non-backward compatible carrier) that determine PLP among the uplink corresponding to the downlink, The PLP determination unit 115 determines that PLP has also occurred in the corresponding downlink.
- the component carriers for example, backward compatible carrier and non-backward compatible carrier
- radio resources are not allocated to a component carrier that is in a state where data cannot be received. For this reason, waste of radio resources can be suppressed.
- the PLP determination unit 115 determines the PLP by measuring the reference signal.
- PLP is determined only for.
- a backward compatible carrier and a non-backward compatible carrier are set as component carriers for measuring a reference signal and determining PLP
- an extension carrier is set as a component carrier for measuring a reference signal and not determining PLP.
- the PLP determination unit 115 determines only the PLP of the backward compatible carrier and the non-backward compatible carrier, and does not determine the PLP of the extension carrier.
- the PLP determination unit 115 measures the reference signal and determines the PLP. On the basis of the PLP determination result of the component carrier to be performed, the PLP determination of the component carrier that does not determine the PLP by measuring the reference signal may be performed.
- the radio wave status determination unit 111 determines whether the terminal 100 is RLF (Radio Link Failure). When it is determined that the terminal 100 is not an RLF, the radio wave status determination unit 111 notifies the report creation unit 113 of which component carrier has caused the PLP. On the other hand, when the radio wave status determination unit 111 determines that the terminal 100 is RLF, it starts RRC connection re-establishment processing.
- RLF Radio Link Failure
- the radio wave condition determination unit 111 notifies the report generation unit 113 of which component carrier has generated PLP, when the PLP has occurred in a component carrier that affects data transmission / reception of other component carriers. Does not need to notify the report creation unit 113 of the component carrier that cannot transmit and receive data due to the occurrence of PLP in the component carrier. For example, when a backward compatible carrier and an extension carrier are used as a set and a PLP occurs in the backward compatible carrier and the extension carrier, the radio wave condition determination unit 111 reports only the backward compatible carrier to the report creation unit 113. May be notified. In this way, since the number of component carriers in which PLP has occurred that the terminal 100 notifies to the base station can be reduced, waste of radio resources can be suppressed.
- the radio wave status determination unit 111 determines whether the terminal 100 is RLF based on the presence / absence of a component carrier that allows the terminal 100 to maintain connection with the base station. That is, the radio wave condition determination unit 111 determines that the terminal 100 is RLF when PLP is generated in all of the component carriers that can maintain the connection with the base station. On the other hand, the radio wave condition determination unit 111 determines that the terminal 100 is not an RLF when there is a component carrier in which PLP is not generated among the component carriers in which the terminal 100 can maintain connection with the base station.
- the terminal 100 can maintain a connection with the base station.
- the first example is a component carrier for which PLP is determined.
- a backward compatible carrier and a non-backward compatible carrier that is, when PLP occurs in all component carriers for which PLP is determined, terminal 100 becomes RLF.
- the second example is an uplink with a random access channel (Random Access Channel: RACH). That is, when PLP occurs in the uplink with RACH, when there is no other uplink with RACH, the terminal 100 becomes RLF.
- RACH Random Access Channel
- a third example is a downlink mapped to an uplink with RACH. That is, when PLP occurs in the downlink mapped to the uplink with RACH, if there is no other downlink mapped to the uplink with RACH, the terminal 100 becomes RLF.
- the 4th example is a component carrier which can maintain a connection with a base station independently.
- a backward compatible carrier and a non-backward compatible carrier That is, when PLP occurs in all backward compatible carriers and non-backward compatible carriers, the terminal 100 becomes RLF.
- the fifth example is an anchor carrier. That is, when PLP occurs in an anchor carrier, if there is no component carrier that can be an anchor carrier instead, terminal 100 becomes an RLF.
- the component carrier with which the terminal 100 can maintain the connection with the base station may be a part or all of the first to fifth examples, or may be other than the above.
- the terminal 100 can determine that RLF has occurred when the connection with the base station is lost, and can quickly perform the RRC connection re-establishment process.
- the radio wave condition determination unit 111 switches the anchor carrier to a component carrier that can also be used as an anchor carrier such as a backward compatible carrier or a non-backward compatible carrier that does not generate PLP when PLP occurs in the anchor carrier. May be.
- the radio wave condition determination unit 111 creates a measurement result report including the measurement result of the component carrier in order to notify the base station when the synchronization with the base station is recovered in the component carrier in which the PLP has occurred.
- the report creation unit 113 is notified. At this time, the report creation unit 113 creates a measurement result report including the measurement result of the component carrier whose synchronization has been recovered. Note that the PLP determination unit may determine whether the synchronization with the base station has been recovered in the component carrier in which PLP has occurred.
- the determination method determines that the synchronization with the base station is recovered from the PLP when the RRC layer continuously receives in-sync from the physical layer a predetermined number of times N311.
- the determination method is not limited.
- the CQI report may include the value of the component carrier whose synchronization has been recovered.
- the report creation unit 113 creates a measurement result report (Measurement Report: MR) for reporting the PLP to the base station, and outputs the measurement result report to the transmission unit 107.
- the report creation unit 113 includes information on the component carrier in which PLP has occurred in the measurement result report. Therefore, terminal 100 can inform the base station which component carrier has generated PLP.
- the report creation unit 113 uses the “MeasObject” included in the measurement settings sent from the base station in advance to measure the unused component carrier (Measurement) and newly add a component to be added. You may create the measurement result report containing the measurement result of a carrier. At this time, by temporarily suspending monitoring of the component carrier in which PLP has occurred, it is possible to measure other component carriers without obtaining a new “Measurement Gap (period for temporarily stopping data reception)”. it can.
- the report creation unit 113 may create a CQI report excluding the CQI (Channel Quality ⁇ ⁇ ⁇ ⁇ Indicator) in the component carrier where the PLP has occurred, instead of the measurement result report.
- a CQI report including the component carrier may be created.
- the base station does not allocate radio resources to the component carrier lacking the CQI based on the lack of the component carrier where the PLP has occurred in the CQI report. Therefore, waste of radio resources can be reduced.
- the terminal 100 may notify the uplink corresponding to the downlink to the base station as a PLP using PHR (Power Header Room).
- the PHR is for notifying the base station of the remaining transmission power of the terminal 100.
- a new PLP notification flag may be added to the PHR format.
- the control unit 105 instructs the reception unit 101 to receive broadcast information or individual control information transmitted from the base station.
- the control unit 105 outputs the measurement setting based on the individual control information output from the reception unit 101 to the report creation unit 113.
- the processing when the control unit 105 receives an inquiry about the timing for transmitting the CQI report, PHR, or measurement result report from the transmission unit 107 includes the case where the uplink allocation is obtained from the reception unit 101 and the uplink allocation. It differs from the case where it is not obtained. That is, when uplink allocation is obtained, the control unit 105 outputs the timing to the transmission unit 107. When uplink allocation is not obtained, the control unit 105 sends a scheduling request (Scheduling Request) to the base station using radio resources for uplink control signals allocated in advance so as to obtain uplink allocation. To the transmission unit 107.
- a scheduling request Scheduling Request
- control unit 105 When the control unit 105 obtains an uplink assignment from the reception unit 101, the control unit 105 instructs the transmission unit 107 to transmit a buffer status report (Buffer Status Report) to the base station. Thereafter, the control unit 105 receives the uplink assignment from the reception unit 101 and instructs the transmission unit 107 to transmit the CQI report, PHR, or measurement result report.
- Buffer Status Report Buffer Status Report
- the transmission unit 107 inquires of the control unit 105 about the timing of transmitting data such as CQI report, PHR or measurement result report input from the report control unit 103. Further, the transmission unit 107 transmits data such as a CQI report, PHR, measurement result report, or control signal to the base station in accordance with an instruction from the control unit 105.
- FIG. 4 is a block diagram of a base station configuring the wireless communication system according to the first embodiment.
- the base station 150 according to the first embodiment includes a reception unit 151, a PLP determination unit 153, a control unit 155, and a transmission unit 157.
- the reception unit 151 receives the CQI report, PHR, or measurement result report transmitted by the terminal 100 and outputs the CQI report, PHR, or measurement result report to the PLP determination unit 153.
- the PLP determination unit 153 determines whether the measurement result report includes a component carrier having a value indicating that PLP has occurred. When the measurement result report does not include a component carrier having a value indicating that PLP has occurred, the PLP determination unit 153 determines that the measurement result report is a normal measurement result report, and outputs the measurement result report to the control unit 155. . When the component result of the value which shows that PLP generate
- the PLP determination unit 153 includes a component carrier other than the component carrier in use by the terminal 100 in the measurement result report. Judge whether it is.
- the base station 150 determines that the terminal 100 requests to add the component carrier.
- the PLP determination unit 153 instructs the control unit 155 to add a component carrier other than the component carrier in use by the terminal 100, which is included in the measurement result report sent from the terminal 100.
- a component carrier having a value indicating that PLP has occurred is included in the measurement result report
- a component carrier other than the component carrier in use by the terminal 100 is included in another measurement result report sent from the same terminal 100. May be included, the base station 150 may determine that the terminal 100 is requesting to add the component carrier.
- the PLP determination unit 153 instructs the control unit 155 to add a component carrier other than the component carrier in use by the terminal 100, which is included in the other measurement result report. In this way, component carriers that the terminal 100 desires to add can be preferentially added.
- the PLP determination unit 153 may determine whether there is a component carrier that is used by the terminal 100 and is not included in the CQI report. .
- PLP determination section 153 determines that PLP has occurred in that component carrier.
- the PLP determination unit 153 notifies the control unit 155 that PLP has occurred in the component carrier.
- the PLP determination unit 153 may determine whether there is a component carrier that is not used by the terminal 100 in the CQI report.
- the PLP determination unit 153 instructs the control unit 155 to add a component carrier other than the component carrier that the terminal 100 is using.
- the PLP determination unit 153 may determine the PLP based on whether the PHR includes a value or a flag indicating that PLP has occurred. When the PLP determination unit 153 determines that PLP has occurred, the PLP determination unit 153 notifies the control unit 155 that the component carrier is PLP.
- the PLP determination unit 153 determines that the synchronization with the base station 150 has been recovered, and notifies the control unit You may notify to 155 and you may have with the said function.
- the control unit 155 When the information about the component carrier in which the PLP is generated is input from the PLP determination unit 153, the control unit 155 confirms whether the component carrier is used to control another component carrier. When being used to control other component carriers, the control unit 155 considers that the corresponding component carriers have also generated PLP, and does not allocate radio resources.
- the control unit 155 When the information about the component carrier in which PLP has occurred is input from the PLP determination unit 153, the control unit 155 temporarily stops the allocation of radio resources to the component carrier.
- the control unit 155 determines whether or not the component carrier can be added based on the usage status and setting of the component carrier. When the component carrier can be added, the control unit 155 creates individual control information for addition and outputs the individual control information to the transmission unit 157.
- control unit 155 If the control unit 155 receives a component carrier in which PLP has occurred from the PLP determination unit 153, the control unit 155 is not notified of the addition of a new component carrier from the PLP determination unit 153, or determines that the notified component carrier is not sufficient
- the measurement setting may be sent to the terminal 100 to measure other component carriers.
- the control unit 155 determines whether to instruct the terminal 100 to perform handover to another cell or change of the component carrier. When it is determined that the handover or the change of the component carrier is instructed only by the input measurement result report, the control unit 155 performs the handover or the change of the component carrier. On the other hand, when the control unit 155 determines that the handover or the change of the component carrier is not instructed only by the input measurement result report, when the control unit 155 determines that the terminal 100 is instructed to measure another component carrier, the control unit 155 The transmission unit 157 is instructed to send the setting to the terminal 100. In addition, when it is determined that the handover or component carrier change is not instructed only by the input measurement result report, the control unit 155 does nothing when a new measurement result is not required.
- control unit 155 resumes the assignment of the radio resource to the component carrier.
- the transmission unit 157 transmits a reference signal or control information to the terminal 100 based on the schedule information.
- the radio communication system according to the second embodiment includes a terminal and a base station included in the radio communication system according to the first embodiment.
- the terminal receives a reference signal transmitted from the base station for each cell in the downlink, and reports a measurement result derived based on a predetermined calculation formula. As a function of reporting to the base station in the uplink.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 5 is a block diagram illustrating terminals constituting the wireless communication system according to the second embodiment.
- the terminal 200 according to the second embodiment includes a reception unit 101, a report control unit 201, a control unit 105, and a transmission unit 107.
- the terminal 200 of this embodiment is different from the terminal 100 of the first embodiment in the configuration of the report creation unit. Therefore, in the constituent elements included in the terminal 200 of the present embodiment, the same reference is made to the same constituent elements (the receiving unit 101, the control unit 105, and the transmitting unit 107) as the constituent elements of the terminal 100 of the first embodiment. Numbers are assigned respectively, and detailed description thereof is omitted.
- the report control unit 201 includes a radio wave state determination unit 211 and a report creation unit 213, similarly to the report control unit 201 of the first embodiment.
- the radio wave condition determining unit 211 has the same function as the radio wave condition determining unit 111 of the first embodiment.
- the report creation unit 213 includes a measurement setting generation unit 217 and a monitor carrier determination unit 219 in addition to the function of the report creation unit 113 of the first embodiment.
- the measurement setting generation unit 217 receives the component carrier information from the report generation unit 213 and generates a measurement setting of the component carrier when instructed to generate the measurement setting of the component carrier indicated by the information.
- the measurement setting generation unit 217 outputs the generated measurement setting to the report generation unit 213.
- the measurement setting generation unit 217 generates the component carrier measurement settings.
- the first example is a method for creating a measurement setting based on the measurement setting set for the anchor carrier.
- the second example is a method for generating a measurement setting based on a measurement setting of a component carrier in which PLP has occurred.
- a method of generating the measurement setting based on the measurement setting of the component carrier used in combination with the extension carrier may be used.
- the third example is a method for generating a measurement setting based on the measurement settings of other component carriers in the same frequency band as the component carrier for generating the measurement settings.
- the fourth example is a method of generating a measurement setting based on the measurement setting of a backward compatible carrier or a non-backward compatible carrier that is set with the component carrier in the case of measuring an extension carrier.
- the measurement setting set for another backward compatible carrier is used, and in the case of measurement of a non-backward compatible carrier, another non-backward carrier is used.
- the measurement setting set for the word compatible carrier is used, and in the case of measurement of the extension carrier, the measurement setting set for another extension carrier is used.
- the above examples may be combined, or the measurement settings may be generated by a method other than the above examples.
- terminal 200 can measure the component carrier without receiving a new measurement setting from the base station.
- the measurement setting of the carrier not used by the terminal can be generated because the component carrier that generated PLP cannot receive data, and instead of monitoring the component carrier that generated PLP, it measures different carrier frequencies. This is because it is not necessary to newly notify “Measurement Gap (period in which data reception is temporarily stopped)” from the base station.
- the monitoring carrier determination unit 219 determines the component carrier to be measured based on the information input from the report creation unit 213.
- the monitoring carrier determination unit 219 determines a component carrier that can be used instead of the component carrier in which PLP has occurred.
- the monitored carrier determination unit 219 outputs the determined component carrier to the report creation unit 213. Note that the monitoring carrier determination unit 219 determines another component carrier that can be used instead of the component carrier in which the PLP is generated when the report generation unit 213 inputs that the determined component carrier cannot be used, and the report generation unit 213. Output to.
- the first is a component carrier that is not being used.
- the second is a component carrier that can be used as an anchor carrier when PLP occurs in the anchor carrier.
- the component carrier belongs to a frequency band different from the frequency band to which the component carrier in which PLP occurs belongs.
- PLP occurs in a backward compatible carrier or a non-backward compatible carrier, it is a component carrier of a backward compatible carrier or a non-backward compatible carrier.
- the fifth is a component carrier that is easy to set up.
- PLP occurs in an extension carrier
- it is a component carrier that is a backward compatible carrier used as a set with the extension carrier or another extension carrier used as a set with a non-backward compatible carrier thing.
- it is a component carrier from which frequency information can be obtained.
- the sixth is that the component carrier can be used simultaneously with the component carrier in use.
- component carriers that have been set up as component carriers are deactivated (de-activate).
- the deactivated component carrier is a component carrier in which the component carrier is set (Component Carrier Configuration) and the terminal does not transmit or receive data.
- the base station since the base station can start using the component carrier only by notifying the terminal of the activation (activate), the terminal can start using it earlier than other component carriers. it can. Also, the use of radio resources can be reduced by the amount that the base station does not have to send component carrier setting information.
- measurement may be performed from a component carrier that meets all of the above conditions, or measurement may be performed from a component carrier that meets some of the above conditions.
- the time required for measuring the component carriers can be shortened.
- QoS Quality of Service
- the report creation unit 213 When the measurement setting of the component carrier input from the monitoring carrier determination unit 219 is present, the report creation unit 213 performs measurement (Measurement) using the measurement setting. When there is no measurement setting of the component carrier input from the monitoring carrier determination unit 219, the report creation unit 213 instructs the measurement setting generation unit 217 to generate the measurement setting of the component carrier.
- the report creation unit 213 determines whether or not the component carrier can be used based on the measurement result of the component carrier input from the monitoring carrier determination unit 219. When the report creation unit 213 determines that the component carrier cannot be used, the report generation unit 213 outputs that fact to the monitoring carrier determination unit 219. On the other hand, when the report creation unit 213 determines that the component carrier can be used, the report creation unit 213 generates a measurement result report including the measurement result of the component carrier and the measurement result of the component carrier in which PLP has occurred, and outputs the measurement result report to the transmission unit 107 To do. Note that the report creation unit 213 may create two measurement result reports that separately include these two measurement results. Further, a CQI report may be used instead of the measurement result report.
- the wireless communication system according to the third embodiment includes a terminal and a base station.
- a terminal receives a reference signal transmitted from a base station for each cell in the downlink, and reports a measurement result derived based on a predetermined calculation formula. As a function of reporting to the base station in the uplink.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 6 is a block diagram illustrating terminals constituting the wireless communication system according to the third embodiment.
- the terminal 300 according to the third embodiment includes a reception unit 101, a report control unit 301, a CQI report creation unit 303, a measurement result report creation unit 305, a control unit 307, and a transmission. Unit 107.
- the terminal 300 of this embodiment is different from the terminal 100 of the first embodiment in the configuration of the report control unit and the control unit. Therefore, in the constituent elements included in the terminal 300 of the present embodiment, the same constituent elements (the receiving unit 101 and the transmitting unit 107) as the constituent elements of the terminal 100 of the first embodiment are denoted by the same reference numerals. Detailed description thereof will be omitted.
- the report control unit 301 controls the measurement of the reference signal based on the CQI report setting (CQI report config) or the measurement setting (Measurement Configuration) input from the control unit 307. In addition, the report control unit 301 instructs the reception unit 101 to measure the reference signal. Further, the report control unit 301 determines the radio wave status based on the reference signal input from the receiving unit 101.
- CQI report setting CQI report config
- Measurement Configuration Measurement Configuration
- the report control unit 301 includes a radio wave state determination unit 311, a mode determination unit 313, a self carrier monitoring mode unit 315, and another carrier monitoring mode unit 317.
- the radio wave condition determination unit 311 includes a PLP determination unit 319.
- the PLP determination unit 319 has the same function as the PLP determination unit 115 of the first embodiment.
- the radio wave condition determination unit 311 of the third embodiment has substantially the same function as the radio wave condition determination unit 311 of the first embodiment, but when it is determined that the terminal 300 itself is not an RLF, in which component carrier The mode determination unit 313 is notified whether PLP has occurred.
- the mode determination unit 313 determines whether it is based on a determination criterion set in advance in the terminal 300 or a determination criterion sent from the base station. Or whether to monitor other carriers.
- the mode determination unit 313 determines to monitor its own carrier in order to wait for recovery of synchronization with the base station in the component carrier in which PLP has occurred, information indicating the component carrier in which the PLP has occurred in the own carrier monitoring mode unit 315 Is output. On the other hand, if the mode determination unit 313 determines that the terminal 300 monitors another carrier in order to newly use another component carrier, the mode determination unit 313 outputs information indicating the component carrier in which the PLP has occurred to the other carrier monitoring mode unit 317. To do.
- the mode determination unit 313 As a determination criterion of the mode determination unit 313, for example, QoS (Quality of Service) is used. The QoS at the terminal is considered to be affected by the throughput and delay.
- QoS Quality of Service
- the mode determination unit 313 can maintain the throughput with the remaining component carriers other than the component carrier in which PLP has occurred, or if the terminal 300 is satisfied even if the throughput is reduced, Is determined to be monitored.
- the mode determination unit 313 determines to monitor other carriers.
- the mode determination unit 313 can maintain the delay time with the remaining component carriers other than the component carrier in which the PLP is generated, or the terminal 300 is satisfied even if the delay time becomes long. For example, it is determined that the own carrier is monitored. On the other hand, mode determination section 313 determines to monitor other carriers if the remaining component carriers other than the component carrier in which PLP occurs cannot maintain the delay time or terminal 300 cannot satisfy the delay time extension.
- the mode determination unit 313 selects the own carrier monitoring mode, so that useless signaling and measurement can be reduced. For this reason, waste of radio resources can be suppressed and power consumption of the terminal 300 can be suppressed.
- the mode determination unit 313 selects the other carrier monitoring mode, the other carrier is measured and the handover or the change of the component carrier can be performed to compensate for the decrease in the QoS. it is conceivable that.
- the mode determination unit 313 determines whether PLP has occurred in a component carrier that affects other component carriers or whether PLP has occurred in a component carrier that does not affect other component carriers. It is determined whether to monitor own carrier or other carrier. When PLP occurs in a component carrier that affects other component carriers, the mode determination unit 313 determines to monitor other carriers. On the other hand, when PLP occurs in a component carrier that does not affect other component carriers, the mode determination unit 313 determines to monitor its own carrier.
- component carriers that affect other component carriers and component carriers that do not affect other component carriers there are three possible examples of component carriers that affect other component carriers and component carriers that do not affect other component carriers.
- component carriers that affect other component carriers are backward compatible carriers and non-backward compatible carriers, and component carriers that do not affect other component carriers are extension carriers.
- the component carrier that affects other component carriers is an anchor carrier, and the component carrier that does not affect other component carriers is other than the component carrier of the anchor carrier.
- a component carrier that affects other component carriers is a component carrier that reports PDCCH, and a component carrier that does not affect other component carriers does not report PDCCH. Is a career.
- the set of component carriers that affect other component carriers and component carriers that do not affect other component carriers may be other than the above three sets.
- the mode determination unit 313 determines whether to monitor its own carrier or another carrier according to the reception quality of the component carrier in which no PLP occurs.
- the mode determination unit 313 determines to monitor its own carrier when the reception quality of the component carrier in which PLP does not occur is good, and monitors other carriers when the reception quality of the component carrier in which no PLP occurs is poor Judge that.
- the reception quality is determined by measurement or CQI.
- One is a method of determining the number of component carriers that exceed a criterion for determining whether reception quality (reception power is acceptable) is good or bad. According to this method, it is possible to accurately determine whether QoS can be satisfied.
- the other is a method of selecting a reference component carrier and determining the received quality of the component carrier (reception power may be acceptable). According to this method, since the determination conditions are small, mounting is easy.
- the mode determination unit 313 determines whether to monitor its own carrier or another carrier depending on whether discontinuous reception (Discontinuous Reception (DRX)) is set.
- the mode determination unit 313 determines to monitor its own carrier when DRX is set, and determines to monitor other carriers when DRX is not set.
- DRX discontinuous Reception
- the mode determination unit 313 may determine whether or not the component carrier is performing DRX, not whether or not DRX is set. At this time, the mode determination unit 313 determines to monitor its own carrier if the component carrier is performing DRX, and determines to monitor other carrier if the component carrier is not performing DRX.
- the mode determination unit 313 may determine whether or not the component carrier is performing Long DRX. At this time, if the component carrier is performing Long DRX, it is determined to monitor its own carrier, and if the component carrier is not performing Long DRX, it is determined to monitor another carrier. When performing DRX, it is considered that the reception opportunity may be small, so it can be determined that QoS is satisfied.
- the mode determination unit 313 determines whether to monitor its own carrier or another carrier depending on whether the downlink buffer amount is large.
- the base station sends a signal notifying the downlink buffer amount to the terminal 300.
- the terminal 300 holds in advance a table indicating throughput suitable for the downlink buffer amount (for example, the total bandwidth of the component carriers being used).
- the mode determination unit 313 determines to monitor the own carrier when determining that the number of component carriers is sufficient in order to realize the throughput with respect to the downlink buffer amount. On the other hand, when determining that the number of component carriers is insufficient, the mode determination unit 313 determines to monitor other carriers.
- the mode determination unit 313 determines whether to monitor its own carrier or another carrier depending on whether component carriers having different radio wave conditions are used. When terminal 300 is performing carrier aggregation using one frequency band, mode determination unit 313 determines to monitor its own carrier. On the other hand, when terminal 300 is performing carrier aggregation using a plurality of different frequency bands, mode determination unit 313 determines to monitor other carriers.
- the mode determination unit 313 determines whether to monitor the own carrier or the other carrier depending on whether or not measurement of other carriers is set in advance. When the measurement of unused component carriers (Measurement) is not set, the mode determination unit 313 determines to monitor the own carrier. On the other hand, when the measurement (Measurement) of the unused component carrier is set, the mode determination unit 313 determines to monitor other carriers.
- the mode determination unit 313 determines whether to monitor the own carrier or another carrier according to the capability of the terminal 300 (UE ⁇ Capability). When the terminal 300 has the ability to monitor other component carriers while using the component carrier used by the terminal 300, the mode determination unit 313 determines to monitor other carriers. On the other hand, if the terminal 300 does not have the ability to monitor other component carriers while using the component carrier used by the terminal 300, the mode determination unit 313 determines to monitor the own carrier.
- the mode determination unit 313 determines whether its own carrier exists in the capability (UE Capability) of the terminal 300 according to whether or not there is a component carrier that can be used together with the component carrier being used by the terminal 300. Or whether to monitor other carriers. That is, mode determination section 313 determines to monitor other carriers when there is a component carrier that can be used together with the component carrier being used by terminal 300. On the other hand, the mode determination unit 313 determines to monitor its own carrier when there is no component carrier that can be used together with the component carrier being used by the terminal 300.
- Whether there is a component carrier that can be used together with the component carrier being used by the terminal 300 is determined in the frequency list transmitted from the base station in the backward compatible carrier, the non-backward compatible carrier, or the extension carrier. It becomes possible to make a determination by adding that.
- the mode determination unit 313 determines to monitor other carriers.
- an extension carrier exists in the capability (UE Capability) of the terminal 300 and there is a component carrier that is being used by the terminal 300 and is transmitting a PDCCH for the extension carrier, a mode determination unit 313 determines to monitor other carriers.
- the mode determination unit 313 determines that other carriers are monitored. In other cases, the mode determination unit 313 determines to monitor the own carrier.
- the radio frequency band used by the terminal 300 is used.
- the mode determination unit 313 determines to monitor other carriers.
- the radio frequency bandwidth to be monitored is shifted in the direction opposite to the position where the component carrier where the PLP is generated. By doing so, it is possible to monitor the component carrier on the opposite side with respect to the component carrier in which PLP is generated while using the component carrier in use.
- PLP occurs in a component carrier other than the end of the radio frequency bandwidth used by the terminal 300.
- the determination unit 313 determines to monitor the own carrier.
- the mode determination unit 313 If there is a component carrier that can be used, it is determined to monitor another carrier.
- the terminal 300 supports only one frequency band (for example, 800 MHz band or 2 GHz band), a determination method similar to the above can be applied.
- one frequency band for example, 800 MHz band or 2 GHz band
- the terminal 300 supports two frequency bands (for example, 800 MHz band and 2 GHz band), but only one frequency band can be used at the same time, the same as above in the frequency band in use
- the determination method can be applied.
- the mode determination unit 313 determines to monitor other carriers in the frequency band. On the other hand, if there is no component carrier that can be used in the frequency band and there is a component carrier that can be used in another frequency band (for example, 800 MHz band), the mode determining unit 313 It is determined to monitor other carriers.
- the mode determination unit 313 determines to monitor the other carrier in the other frequency band. On the other hand, if there is no component carrier that can be used in the other frequency band (800 MHz band) and there is a component carrier that can be used in the frequency band (2 GHz band) in which PLP occurs, the mode determination unit 313 It is determined that another carrier is monitored within the frequency band in which the PLP is generated.
- the terminal 300 keeps the component carrier being used and the component carrier being deactivated within the supported radio frequency bandwidth. By doing so, it is possible to continue using the component carrier in use. Further, when a deactivated component carrier is activated, the component carrier can be used immediately.
- the mode determination unit 313 It is determined that there is no extension carrier. At this time, it is not necessary to add to the frequency list that the carrier is a backward compatible carrier or a non-backward compatible carrier. By doing so, even if the extension carrier is not described in the frequency list, it can operate as in the above specific example.
- the terminal 300 By acquiring information by frequency, it is confirmed whether there is a component carrier that can be used. By doing so, the mode determination unit 313 can determine as in the above specific example without adding to the frequency list.
- the capability (UE Capability) of the terminal 300 can be used effectively.
- the mode determination unit 313 may determine whether to monitor the own carrier or another carrier by a method other than the above.
- the own carrier monitoring mode unit 315 instructs the CQI report generation unit 303 to generate a CQI report for reporting the PLP to the base station. Instruct.
- the CQI report creation unit 303 creates a CQI report excluding the CQI of the component carrier in which PLP has occurred, and outputs the CQI report to the transmission unit 107.
- the base station does not allocate radio resources to the component carrier lacking the CQI based on the lack of the component carrier where the PLP has occurred in the CQI report. Therefore, waste of radio resources can be reduced.
- the terminal 300 may notify the uplink corresponding to the downlink to the base station as a PLP by PHR (Power Header Room).
- the PHR is for notifying the base station of the remaining transmission power of the terminal 300.
- a new PLP notification flag may be added to the PHR format.
- the own carrier monitoring mode unit 315 continues to monitor the component carrier in which PLP has occurred.
- the own carrier monitoring mode unit 315 determines that the synchronization with the base station is recovered in the component carrier determined to be PLP
- the own carrier monitoring mode unit 315 outputs information indicating the component carrier recovered from the PLP to the radio wave status determination unit 311.
- the own carrier monitoring mode unit 315 determines that the synchronization with the base station has been recovered from the PLP when the RRC layer continuously receives in-sync from the physical layer a predetermined number of times N311.
- the determination method is not limited.
- the own carrier monitoring mode unit 315 instructs the CQI report creating unit 303 to create a CQI report again in order to notify the base station that the synchronization with the base station has been recovered in the component carrier in which PLP has occurred.
- the CQI report creation unit 303 creates a CQI report including the CQI of the component carrier whose synchronization has been recovered. In this way, radio resources can be reassigned from the base station in the component carrier where PLP has occurred but synchronization with the base station has been recovered.
- the method of notifying the base station that the synchronization with the base station has been recovered in the component carrier in which PLP has occurred may be a method of including in the measurement result report instead of the CQI report.
- the other carrier monitoring mode unit 317 When the information indicating the component carrier in which the PLP has occurred is input from the mode determination unit 313, the other carrier monitoring mode unit 317 generates a measurement result report generation unit for generating a measurement result report for reporting the PLP to the base station. 305 is instructed.
- the measurement result report creation unit 305 creates a measurement result report including the measurement result of the component carrier in which PLP has occurred and the measurement result of the component carrier to be newly added, and outputs the measurement result report to the transmission unit 107. Note that the measurement result report creation unit 305 may create two measurement result reports that separately include these two measurement results.
- the other carrier monitoring mode unit 317 performs measurement (Measurement) of unused component carriers using “MeasObject” included in the measurement settings transmitted from the base station in advance. At this time, the other carrier monitoring mode unit 317 temporarily stops monitoring the component carrier in which the PLP has occurred, so that it is not necessary to newly acquire “Measurement Gap (period in which data reception is temporarily stopped)”. The component carrier can be measured.
- the control unit 307 instructs the reception unit 101 to receive broadcast information or individual control information transmitted from the base station.
- the control unit 307 outputs the measurement setting based on the individual control information output from the reception unit 101 to the other carrier monitoring mode unit 317.
- the processing when the control unit 307 receives an inquiry about the timing for transmitting the CQI report, PHR, or measurement result report from the transmission unit 107 includes the case where the uplink allocation is obtained from the reception unit 101 and the uplink allocation. It is different from the case where it is not obtained. That is, when uplink allocation is obtained, the control unit 307 outputs the timing to the transmission unit 107. When the uplink allocation is not obtained, the control unit 307 transmits a scheduling request (Scheduling Request) to the base station using the radio resource for the uplink control signal allocated in advance so as to obtain the uplink allocation. To the transmission unit 107.
- a scheduling request Scheduling Request
- control unit 307 When the control unit 307 obtains an uplink assignment from the reception unit 101, the control unit 307 instructs the transmission unit 107 to transmit a buffer status report (Buffer Status Report) to the base station. Thereafter, the control unit 307 receives the uplink assignment from the reception unit 101 and instructs the transmission unit 107 to transmit the CQI report, the PHR, or the measurement result report.
- Buffer Status Report Buffer Status Report
- FIG. 8 is a flowchart for explaining the operation of the terminal 300 according to the third embodiment.
- the terminal 300 monitors the synchronization with the base station for each component carrier in use (step S101). Subsequently, terminal 300 detects PLP for each component carrier (step S103). The terminal 300 determines whether to switch the mode of the terminal 300 depending on whether a new component carrier is necessary (step S105). When the terminal 300 determines that a new component carrier is necessary, the terminal 300 shifts to the other carrier monitoring mode (step S107). On the other hand, when determining that a new component carrier is not necessary, the terminal 300 shifts to the own carrier monitoring mode (step S109).
- the terminal 300 when the synchronization with the base station is restored again in the carrier in which PLP occurs, the terminal 300 notifies the base station of this using a measurement result report or a CQI report.
- the terminal 300 sends a measurement result report including the measurement result of the carrier in which the PLP has occurred to the base station.
- the terminal 300 sends a CQI report including a carrier in which PLP has occurred to the base station.
- the terminal 300 may determine the synchronization recovery with the base station by sending in-sync from the physical layer to the RRC layer a predetermined number of times N311. Terminal 300 may determine the recovery of synchronization with the base station by another method.
- FIG. 9 is a block diagram of a base station configuring the wireless communication system according to the third embodiment.
- the base station 350 according to the third embodiment includes a reception unit 151, a PLP determination unit 351, a control unit 155, and a transmission unit 157.
- the base station 350 of this embodiment is different from the base station 150 of the first embodiment in the configuration of the PLP determination unit. Therefore, the same constituent elements (reception unit 151, control unit 155, and transmission unit 157) as those of the base station 150 of the first embodiment are the same in the constituent elements of the base station 350 of the present embodiment.
- the detailed reference explanation is omitted.
- the PLP determination unit 351 determines whether or not a component carrier having a value indicating that PLP has occurred is included in the measurement result report. When the measurement result report does not include a component carrier having a value indicating that PLP has occurred, the PLP determination unit 351 determines that the measurement result report is a normal measurement result report, and outputs the measurement result report to the control unit 155. . When the measurement result report includes a component carrier having a value indicating that PLP has occurred, the PLP determination unit 351 outputs information regarding the component carrier to the control unit 155.
- the PLP determination unit 351 includes a component carrier other than the component carrier in use by the terminal 300 in the measurement result report. Judge whether it is. If a component carrier other than the component carrier in use by terminal 300 is included, base station 350 determines that terminal 300 is requesting to add that component carrier.
- the PLP determination unit 351 instructs the control unit 155 to add the component carrier included in the measurement result report sent from the terminal 300.
- a component carrier having a value indicating that PLP has occurred is included in the measurement result report
- a component carrier other than the component carrier in use by the terminal 300 is included in another measurement result report sent from the same terminal 300. May be included, the base station 350 may determine that the terminal 300 requests to add the component carrier.
- the PLP determination unit 351 instructs the control unit 155 to add a component carrier other than the component carrier in use by the terminal 300, which is included in the other measurement result report.
- the component carrier that the terminal 300 desires to add can be preferentially added.
- the PLP determination unit 351 determines whether there is a component carrier that is used by the terminal 300 and is not included in the CQI report. When the component carrier in use by terminal 300 is not included in the CQI report, PLP determination section 351 determines that PLP has occurred in that component carrier. The PLP determination unit 351 notifies the control unit 155 that PLP has occurred in the component carrier.
- the PLP determination unit 351 determines that the synchronization with the base station has been recovered, and notifies the control unit 155 to that effect. Notify In addition, in the measurement result report input from the reception unit 151, the PLP determination unit 351 indicates that the measurement result of the component carrier determined to be PLP exceeds a value that can be determined that the synchronization with the base station has been recovered. May be notified to the control unit 155, and the function may be provided together with the above function.
- the PLP determination unit 351 may determine the PLP based on whether the PHR includes a value or flag indicating that PLP has occurred. When the PLP determination unit 351 determines that PLP has occurred, the PLP determination unit 351 notifies the control unit 155 that the component carrier is PLP.
- FIG.10 and FIG.11 is a flowchart for demonstrating operation
- the base station 350 determines whether a measurement result report (MR) or a CQI report has been input (step S201).
- the base station 350 determines whether or not a component carrier cell having a value indicating that PLP has occurred is included in the measurement result report (step S203).
- the base station 350 determines that PLP has not occurred when the component carrier cell used by the terminal, which is a value indicating that PLP has been generated, is not included in the measurement result report (step S205).
- the base station 350 When the measurement result report includes a component carrier cell having a value indicating that PLP has occurred, the base station 350 temporarily stops the allocation of radio resources to the component carrier (step S207). The base station 350 determines whether or not to change the component carrier (step S209). If it is determined not to change the component carrier, the base station 350 does nothing (step S211).
- the base station 350 determines whether the component carrier change destination can be determined only by the measurement result report information transmitted from the terminal 300 (step S213).
- the base station 350 notifies the terminal of the carrier change (step S215).
- the base station 350 transmits a measurement setting for measuring the component carrier to the terminal 300 (step S217).
- the base station 350 determines whether there is a component carrier that is used by the terminal 300 and is not included in the CQI report, as illustrated in FIG. (Step S221). If there are no component carriers in the CQI report that are used by the terminal 300 and are not included in the CQI report, that is, if all of the component carriers used by the terminal 300 are present in the CQI report, the base station 350 It determines with it not being PLP (step S223). On the other hand, if a component carrier that is used by terminal 300 and is not included in the CQI report is present in the CQI report, base station 350 determines that it is PLP and does not allocate radio resources to the component carrier (step S225). ).
- the base station 350 receives the measurement result report or CQI report including the component carrier determined to be PLP, and determines that the synchronization with the terminal 300 is recovered based on the report, the base station 350 receives radio resources to the recovered component carrier. Start assigning.
- the wireless communication system according to the fourth embodiment includes a terminal and a base station included in the wireless communication system according to the third embodiment.
- the terminal receives a reference signal transmitted from the base station for each cell in the downlink, and reports a measurement result derived based on a predetermined calculation formula. As a function of reporting to the base station in the uplink.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 12 is a block diagram illustrating terminals configuring the wireless communication system according to the fourth embodiment.
- a terminal 400 according to the fourth embodiment includes a receiving unit 101, a report control unit 401, a CQI report creation unit 303, a measurement result report creation unit 305, a control unit 307, and a transmission. Unit 107.
- the difference between the terminal 400 of the present embodiment and the terminal 300 of the third embodiment is the configuration of the other carrier monitoring mode unit 401 that the report control unit 401 has.
- the same constituent elements as the constituent elements of the terminal 300 of the third embodiment (receiving unit 101, CQI report creating unit 303, measurement result report creating unit 305, control About the part 307 and the transmission part 107), the same reference number is attached
- the report control unit 401 includes a radio wave status determination unit 411, a mode determination unit 413, a local carrier monitoring mode unit 415, and another carrier monitoring mode unit 417.
- the radio wave condition determining unit 411 has the same function as the radio wave condition determining unit 311 of the third embodiment.
- the mode determination unit 413 has the same function as the mode determination unit 313 of the third embodiment.
- the own carrier monitoring mode unit 415 has the same function as the own carrier monitoring mode unit 315 of the third embodiment.
- the other carrier monitoring mode unit 417 includes a measurement setting generation unit 421 and a monitored carrier determination unit 423 in addition to the function of the other carrier monitoring mode unit 317 of the third embodiment.
- the measurement setting generation unit 421 When the component carrier information is input from the other carrier monitoring mode unit 417 and the measurement setting generation unit 421 is instructed to generate the measurement setting of the component carrier indicated by the information, the measurement setting generation unit 421 generates the measurement setting of the component carrier. The measurement setting generation unit 421 outputs the generated measurement setting to the other carrier monitoring mode unit 417.
- the measurement setting generation unit 421 generates the component carrier measurement settings.
- the first example is a method for creating a measurement setting based on the measurement setting set for the anchor carrier.
- the second example is a method for generating a measurement setting based on a measurement setting of a component carrier in which PLP has occurred.
- a method of generating the measurement setting based on the measurement setting of the component carrier used in combination with the extension carrier may be used.
- the third example is a method for generating a measurement setting based on the measurement settings of other component carriers in the same frequency band as the component carrier for generating the measurement settings.
- the fourth example is a method of generating a measurement setting based on the measurement setting of a backward compatible carrier or a non-backward compatible carrier that is set with the component carrier in the case of measuring an extension carrier.
- the measurement setting set for another backward compatible carrier is used, and in the case of measurement of a non-backward compatible carrier, another non-backward carrier is used.
- the measurement setting set for the word compatible carrier is used, and in the case of measurement of the extension carrier, the measurement setting set for another extension carrier is used.
- the above examples may be combined, or the measurement settings may be generated by a method other than the above examples.
- terminal 400 can measure the component carrier without receiving a new measurement setting from the base station. This is because, instead of monitoring the component carrier in which PLP occurs, it is not necessary to newly receive “Measurement Gap (period in which data reception is temporarily stopped)” from the base station by measuring different carrier frequencies. It is.
- the monitored carrier determination unit 423 determines a component carrier to be measured based on the information input from the other carrier monitoring mode unit 417.
- the monitoring carrier determination unit 423 determines a component carrier that can be used instead of the component carrier in which PLP has occurred.
- the monitored carrier determination unit 423 outputs the determined component carrier to the report control unit 401. Note that, when the report control unit 401 inputs that the determined component carrier cannot be used, the monitor carrier determination unit 423 determines another component carrier that can be used instead of the component carrier in which the PLP has occurred, and the report control unit 401 Output to.
- the first is a component carrier that is not being used.
- the second is a component carrier that can be used as an anchor carrier when PLP occurs in the anchor carrier.
- the component carrier belongs to a frequency band different from the frequency band to which the component carrier in which PLP occurs belongs.
- PLP occurs in a backward compatible carrier or a non-backward compatible carrier, it is a component carrier of a backward compatible carrier or a non-backward compatible carrier.
- the fifth is a component carrier that is easy to set up.
- PLP occurs in an extension carrier
- it is a component carrier that is a backward compatible carrier used as a set with the extension carrier or another extension carrier used as a set with a non-backward compatible carrier thing.
- it is a component carrier from which frequency information can be obtained.
- the sixth is that the component carrier can be used simultaneously with the component carrier in use.
- component carriers that have been set up as component carriers are deactivated (de-activate).
- the base station since the base station can start using the component carrier only by notifying the terminal of the activation, the base station can start using it earlier than other component carriers.
- the use of radio resources can be reduced by the amount that the base station does not need to send component carrier setting information.
- measurement may be performed from a component carrier that meets all of the above conditions, or measurement may be performed from a component carrier that meets some of the above conditions.
- the time required for measuring the component carriers can be shortened.
- QoS Quality of Service
- the other carrier monitoring mode unit 417 performs measurement by using the measurement setting of the component carrier input from the monitoring carrier determination unit 423. When there is no measurement setting of the component carrier input from the monitoring carrier determination unit 423, the other carrier monitoring mode unit 417 instructs the measurement setting generation unit 421 to generate the measurement setting of the component carrier.
- the other carrier monitoring mode unit 417 determines whether or not the component carrier can be used based on the measurement result of the component carrier input from the monitoring carrier determination unit 423. When the other carrier monitoring mode unit 417 determines that the component carrier cannot be used from the measurement result of the component carrier, the other carrier monitoring mode unit 417 outputs the fact to the monitoring carrier determination unit 423. On the other hand, when the other carrier monitoring mode unit 417 determines from the measurement result of the component carrier that the component carrier can be used, the measurement result including the measurement result of the component carrier and the measurement result of the component carrier in which PLP has occurred.
- the measurement result report creation unit 305 is instructed to create a report. Note that the measurement result report creation unit 305 may create two measurement result reports that separately include these two measurement results.
- the radio communication system according to the fifth embodiment includes a terminal and a base station included in the radio communication system according to the third embodiment.
- a terminal receives a reference signal transmitted from a base station for each cell in the downlink, and reports a measurement result derived based on a predetermined calculation formula. As a function of reporting to the base station in the uplink.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 13 is a block diagram illustrating terminals constituting the wireless communication system according to the fifth embodiment.
- the terminal 500 according to the fifth embodiment includes a reception unit 101, a report control unit 501, a CQI report creation unit 303, a measurement result report creation unit 305, a control unit 307, and a transmission. Unit 107.
- the terminal 500 of the present embodiment is different from the terminal 300 of the third embodiment in the configuration of the own carrier monitoring mode unit included in the report control unit.
- the same constituent elements as the constituent elements of the terminal 300 of the third embodiment (receiving unit 101, CQI report creating unit 303, measurement result report creating unit 305, control About the part 307 and the transmission part 107), the same reference number is attached
- the report control unit 501 includes a radio wave status determination unit 511, a mode determination unit 513, a local carrier monitoring mode unit 515, and another carrier monitoring mode unit 517.
- the radio wave condition determining unit 511 has the same function as the radio wave condition determining unit 311 of the third embodiment.
- the mode determination unit 513 has the same function as the mode determination unit 313 of the third embodiment.
- the other carrier monitoring mode unit 517 has the same function as the other carrier monitoring mode unit 317 of the third embodiment.
- the own carrier monitoring mode unit 515 includes a monitoring period determining unit 521 in addition to the function of the own carrier monitoring mode unit 315 of the third embodiment.
- the monitoring cycle determination unit 521 determines the monitoring cycle according to the status of the component carrier used by the terminal 500.
- the monitoring period is a period in which the receiving unit 101 receives a reference signal in order to confirm whether the terminal 500 is synchronized with the base station. As the monitoring period becomes longer, that is, as the period in which the reference signal is not received becomes longer, terminal 500 may not try to receive the reference signal. For this reason, waste of power consumption can be suppressed.
- the monitoring period is lengthened when the condition of the reference component carrier is bad, and the monitoring period is shortened when the condition of the reference component carrier is good. For example, if the reference period is held in advance and the condition of the reference component carrier is poor, the monitoring period is set to x times the reference period (x is a real number), and the reference component carrier status Is good, there is a method in which the reference period is the monitoring period.
- DRX discontinuous reception
- y times (y is a real number) set in DRX is set as the monitoring period, and the reference If the component carrier status is good, a method in which the period set by DRX is used as the monitoring period can be considered.
- the first example is a component carrier in which PLP has occurred.
- the second example is an anchor carrier.
- a third example is a backward compatible carrier that is adjacent to or close to the component carrier in which PLP occurs.
- a non-backward compatible carrier may be used.
- the fourth example is a component carrier that belongs to the same frequency band as the frequency band to which the component carrier in which PLP occurs belongs. Note that the above examples may be combined, or a reference component carrier may be selected by a method other than the above examples.
- the radio communication system according to the sixth embodiment includes a terminal and a base station.
- a terminal receives a reference signal transmitted from a base station for each cell in the downlink, and reports a measurement result derived based on a predetermined calculation formula. As a function of reporting to the base station in the uplink.
- the terminal also has a function of receiving a reference signal transmitted from the base station for each cell in the downlink according to the CQI report setting and reporting the CQI report to the base station in the uplink.
- the base station serves as an access point of a radio access network for the terminal, and allocates and manages radio resources (for example, frequency bands in the frequency domain or time domain). Further, the base station has a function of performing a handover process or a component carrier change process when it is determined that a handover to another cell or a component carrier change is necessary based on a measurement result report reported from the terminal. .
- FIG. 14 is a block diagram illustrating terminals configuring the wireless communication system according to the sixth embodiment.
- a terminal 600 according to the sixth embodiment includes a reception unit 101, a report control unit 603, a control unit 605, and a transmission unit 107.
- the terminal 600 of this embodiment is different from the terminal 100 of the first embodiment in that the deactivation monitoring unit 616 and the report creation unit 613 included in the report control unit 603 and the area information management unit 617 included in the control unit 605. It is the composition.
- the same constituent elements (the receiving unit 101 and the transmitting unit 107) as the constituent elements of the terminal 100 of the first embodiment are denoted by the same reference numerals. Detailed description thereof will be omitted.
- the control unit 605 has the following functions in addition to the control unit 105 of the first embodiment.
- the control unit 605 deactivates the component carrier. At this time, the control unit 605 notifies the deactivation monitoring unit 616 of the report control unit 603 that the component carrier has been deactivated.
- the control unit 605 activates the component carrier. At this time, the control unit 605 notifies the deactivation monitoring unit 616 of the report control unit 603 that the component carrier has been activated.
- the control unit 605 has an area information management unit 617.
- the area information management unit 617 manages whether the size of the cell used by the terminal 600 is large or small based on the cell size information included in the broadcast information transmitted from the base station, The information is output to the deactivation monitoring unit 616 of the report control unit 603.
- the first example is a method of expressing in two stages, large and small, using 1 bit.
- the second example is a method of expressing in three stages of large, medium, and small using 2 bits.
- the third example is a method of expressing the size in four stages of 1, 2, 3, and 4 using 2 bits.
- the fourth example is a method of expressing the size in 5 to 8 stages using 3 bits. Other methods may be used.
- the report control unit 603 includes a radio wave condition determination unit 111, a deactivate monitor unit 616, and a report creation unit 613.
- the radio wave condition determination unit 111 has the same function as that of the first embodiment.
- the deactivation monitoring unit 616 when notified from the control unit 605 that the component carrier has been deactivated or activated, manages the information. In addition, the deactivation monitoring unit 616 selects one of the deactivated component carriers that has been configured to measure the component carrier frequency, and monitors the component carrier.
- FIG. 15 is a flowchart for explaining the operation of the deactivation monitoring unit 616 when it is notified that the component carrier has been deactivated.
- the frequency of the component carrier is measured and set for the component carrier. It is determined whether the frequency is reached (step S603).
- the deactivate monitor unit 616 ends the process.
- the deactivation monitoring unit 616 checks the size of the deactivated component carrier area (step S605).
- the deactivation monitoring unit 616 checks whether there is a component carrier to be monitored (step S607). If there is no component carrier being monitored (NO in step S607), the deactivation monitoring unit 616 monitors the component carrier notified in step S601 (hereinafter referred to as “notified component carrier”) (step S609). On the other hand, when there is a monitored component carrier (YES in step S607), the deactivation monitoring unit 616 determines whether the size of the monitored component carrier is smaller than the size of the area of the notification component carrier. (Step S611).
- the deactivation monitoring unit 616 When the size of the monitored component carrier area is equal to or larger than the size of the notified component carrier area (NO in step S611), the deactivation monitoring unit 616 continues to monitor the monitored component carrier (step S613). ). On the other hand, when the size of the component carrier being monitored is smaller than the size of the area of the notification component carrier (YES in step S611), the deactivation monitoring unit 616 switches the monitored component carrier to the notification component carrier (step S615). .
- the deactivation monitoring unit 616 may monitor these component carriers at the same time. In addition, the deactivation monitoring unit 616 notifies the report creation unit 613 of the report control unit 603 that the status of the component carrier being monitored is improved.
- FIG. 16 is a flowchart for explaining the operation of the deactivation monitoring unit 616 when it is notified that the component carrier has been activated.
- the deactivation monitoring unit 616 determines whether or not the notified component carrier is being monitored. (Step S703). If the notified component carrier is not monitored (NO in step S703), the deactivate monitoring unit 616 ends the process. On the other hand, when the notified component carrier is monitored (YES in step S703), the deactivation monitoring unit 616 determines whether there is another component carrier that has been measured and set to deactivate (step S705).
- step S705 If there is no other component carrier that has been set and deactivated (NO in step S705), the deactivation monitoring unit 616 stops monitoring the component carrier (step S707). If there is another component carrier that has been measured and deactivated (YES in step S705), the deactivation monitoring unit 616 has an area of the same size as the area of the component carrier notified in step S701, and is measured and configured. It is then determined whether there is a deactivated component carrier (step S709).
- the deactivation monitoring unit 616 displays the notified component The monitoring of the carrier is stopped, and one component carrier having a large area is selected from the component carriers that have been measured, set, and deactivated, and the component carrier is monitored (step S711).
- the deactivation monitoring unit 616 notifies the notified component carrier The monitoring of the carrier is stopped, and the component carrier in the area of the same size that has been set and deactivated is monitored (step S713).
- the deactivation monitoring unit 616 may monitor all of these component carriers. Further, the deactivation monitoring unit 616 selects only one component carrier having a large area from the remaining component carriers that have been measured, set, and deactivated, in addition to monitoring component carriers having the same area. Component carriers may also be monitored. At this time, when there are a plurality of component carriers of the same size area that have been set and deactivated, the deactivation monitoring unit 616 selects one.
- the deactivation monitoring unit 616 can monitor the component carriers based on the size of the area, thereby reducing the monitoring of the component carriers that have no possibility of recovery.
- the deactivation monitoring unit 616 has a larger area for the component carrier to be monitored among the component carriers that have been measured and deactivated. Switch to component carrier.
- the report creation unit 613 has the following functions in addition to the function of the report creation unit 113 of the first embodiment.
- the report creation unit 613 creates a measurement result report for the component carrier.
- the report creation unit 613 may create a CQI report including the CQI of the component carrier whose state has been recovered instead of the measurement result report.
- the report creation unit 613 outputs the created measurement result report or CQI report to the transmission unit 107.
- FIG. 17 is a block diagram of a base station constituting the wireless communication system according to the sixth embodiment.
- the base station 650 according to the sixth embodiment includes a reception unit 151, a PLP determination unit 153, a control unit 655, and a transmission unit 157.
- the base station 650 of this embodiment is different from the base station 150 of the first embodiment in the configuration of the control unit. Therefore, in the constituent elements included in the base station 650 of the present embodiment, the same constituent elements (receiving unit 151, PLP determining unit 153, and transmitting unit 157) as the constituent elements of the base station 150 of the first embodiment, The same reference numerals are assigned, and detailed description thereof is omitted.
- the control unit 655 has the following functions in addition to the functions of the control unit 155 of the first embodiment.
- the control unit 655 outputs a control signal instructing deactivation to be transmitted to the terminal 600 to the transmission unit 157 when temporarily suspending radio resource allocation to the component carrier.
- the control unit 655 outputs a control signal instructing activation to be transmitted to the terminal 600 to the transmission unit 157 when starting to allocate radio resources to the component carrier.
- control unit 655 may instruct the transmission unit 157 to send a control signal instructing deactivation or activation using PDCCH (Physical-Downlink-Control-CHannel).
- control unit 655 may output a flag instructing to temporarily stop the measurement setting together with the control signal.
- control unit 655 may output a flag instructing to start measurement setting together with a control signal.
- the terminal 600 may derive the area information from the received power.
- the area information is derived from the transmission power of the base station 650. Further, the area information may be set so that the area increases in order from the top of the frequency list or from the bottom. In that case, the same operation is possible.
- the own carrier monitoring mode unit 415 of the fourth embodiment may be replaced with the own carrier monitoring mode unit 515 of the fifth embodiment. it can.
- the function of the own carrier monitoring mode unit 515 of the fifth embodiment can be added to the first report control unit 103.
- the deactivation monitoring unit 616 and the area information management unit 617 of the sixth embodiment are replaced with the report of the third embodiment.
- the controller 301 and the controller 307 can be incorporated.
- the base station demonstrated above may be applied to what accommodates terminals, such as a relay node (Relay * Node) or a home eNB (Home * eNB). Further, the terminal described above may be applied to a terminal connected to a base station such as a relay node.
- a relay node Relay * Node
- Home * eNB Home * eNB
- the mode determination units 313, 413, and 513 may determine that neither the other carrier nor the own carrier is monitored depending on the status of the component carrier in use. For example, when the number of component carriers in use is equal to or greater than the natural number z, the mode determination unit determines that neither another carrier nor its own carrier is monitored.
- the natural number z may be indicated by signaling from the base station, may be uniquely determined from the terminal capability (UE Capability), or may be set in the terminal in advance. In this way, extra measurements can be reduced. Further, when the measurement setting is performed from the base station, it is possible to reduce the number of times the base station transmits the measurement setting signal by determining whether or not the terminal performs the measurement according to the condition.
- the mode determination units 313, 413, and 513 may determine that neither another carrier nor the own carrier is monitored according to the component carrier in which PLP has occurred. For example, in the case of an extension carrier, the mode determination unit determines that neither another carrier nor its own carrier is monitored. By doing so, the number of times the terminal measures can be reduced.
- the carrier that sends the PDCCH of the extension carrier when the carrier that sends the PDCCH of the extension carrier is deactivated, it may be determined that the extension carrier is also deactivated. In this way, it is possible to deactivate the monitoring of a carrier that has fallen into a state where it cannot be received without a control signal.
- PLP when PLP occurs in the extension carrier, it may be determined to be in a deactivated state without a control signal from the base station and not to search for another carrier.
- a flag for instructing measurement according to the capability (UE Capability) of the terminal may be included in the measurement setting.
- the terminal can explicitly know that the measurement is performed without the measurement gap when the measurement setting is performed on the component carrier that is not in use.
- the terminal may include a flag indicating that it is desired to perform the other carrier monitoring mode when sending the measurement result report. By doing so, the base station can pass the measurement setting for the other carrier monitoring mode to the terminal.
- the terminal may have a function of deactivating a component carrier in which PLP has occurred.
- the terminal manages the transmission timing for each group and sets the transmission timing for each group.
- DL Reference CC downlink reference component carrier
- each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the wireless communication device, the wireless communication base station, and the wireless communication system according to the present invention are useful as a device or a system that performs communication by using each component carrier of a plurality of communication cells simultaneously by carrier aggregation.
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Abstract
Description
・測定設定を示す識別子である測定識別子(Measurement Identities(MeasID))
・測定する対象を示す測定対象(Measurement Object(MeasObject))
・測定結果のフィルタリング(filtering)処理動作などを示すクオンティティ設定(Quantity Configuration(QuantityConfig))
・測定結果報告(MR)を送るためのトリガー基準と測定結果報告(MR)のフォーマットを示す報告設定(Reporting Configuration(ReportConfig))
・他の周波数又は他のシステムにおける受信電波状況を測定するための、データを送受信しない期間を示す測定ギャップ(Measurement Gap)
これらの情報の中でも、測定識別子(MeasID)、測定対象(MeasObject)及び報告設定(ReportConfig)は連携した情報である。
無線通信システムは、複数の端末と複数の基地局とから構成される。無線通信システムにおいて、各基地局は、複数の通信セルを構成する。ここで、通信セルとは、1つの基地局から地理的エリアに対して割り当てられた識別子、又は当該地理的エリアで用いられる周波数の相違に基づいて、端末がユニークに識別できる無線ネットワークオブジェクトをいう。以下の説明では、通信セルを単に「セル」という。
第1のタイプでは、複数のバックワードコンパチブルキャリアのみを使用する。
第2のタイプでは、1つ又は複数のバックワードコンパチブルキャリアと、1つ又は複数のノンバックワードコンパチブルキャリアを使用する。
第3のタイプでは、1つ又は複数のバックワードコンパチブルキャリアと、1つ又は複数のエクステンションキャリアを使用する。
第4のタイプでは、1つ又は複数のバックワードコンパチブルキャリアと、1つ又は複数のノンバックワードコンパチブルキャリアと、1つ又は複数のエクステンションキャリアを使用する。
第5のタイプでは、複数のノンバックワードコンパチブルキャリアのみを使用する。
第6のタイプでは、1つ又は複数のノンバックワードコンパチブルキャリアと1つまたは複数のエクステンションキャリアを使用する。
第2の方法では、バックワードコンパチブルキャリア及びノンバックワードコンパチブルキャリアでは、端末が接続するために必要な報知情報を報知し、エクステンションキャリアでは、キャリア固有の報知情報を報知する。
第1の実施の形態の無線通信システムについて説明する。第1の実施の形態の無線通信システムは、端末及び基地局から構成される。
図3は、第1の実施の形態の無線通信システムを構成する端末のブロック図である。図3に示すように、第1の実施の形態の端末100は、受信部101と、報告制御部103と、制御部105と、送信部107とを備える。
複数のバックワードコンパチブルキャリアのみを使用している場合、一つのバックワードコンパチブルキャリアでPLPが発生すると、PLP判定部115は、そのバックワードコンパチブルキャリアでPLPが発生したと判定し、それ以外のバックワードコンパチブルキャリアではPLPが発生していないと判定する。また、複数のバックワードコンパチブルキャリアでPLPが発生すると、PLP判定部115は、それらのバックワードコンパチブルキャリアでPLPが発生したと判定し、それら以外のバックワードコンパチブルキャリアではPLPが発生していないと判定する。
第1の例は、PLPが判定されるコンポーネントキャリアである。例えば、バックワードコンパチブルキャリアとノンバックワードコンパチブルキャリアである。すなわち、PLPが判定されるコンポーネントキャリア全てにおいて、PLPが発生すると、端末100はRLFとなる。
第3の例は、RACHがあるアップリンクとマッピングされているダウンリンクである。すなわち、RACHがあるアップリンクとマッピングされているダウンリンクにおいてPLPが発生すると、他にRACHがあるアップリンクとマッピングされているダウンリンクがなければ、端末100はRLFとなる。
第5の例は、アンカーキャリアである。すなわち、アンカーキャリアにおいてPLPが発生した場合、代わりにアンカーキャリアとなり得るコンポーネントキャリアがない場合、端末100はRLFとなる。
電波状況判定部111は、PLPが発生したコンポーネントキャリアにおいて基地局との同期が回復した場合、そのことを基地局に通知するために、該コンポーネントキャリアの測定結果を含めた測定結果報告を作成するよう報告作成部113に通知する。このとき、報告作成部113は、同期が回復したコンポーネントキャリアの測定結果を含めた測定結果報告を作成する。なお、PLPが発生したコンポーネントキャリアにおいて基地局との同期が回復したかは、PLP判定部で判定してもよい。判定方法は、RRC層において、物理層から同期中(in-sync)を所定回数N311連続して受信するとき、PLPから基地局との同期が回復したと判定する。但し、当該判定方法には限られない。なお、測定結果報告の代わりに、CQI報告に同期が回復したコンポーネントキャリアの値を含めても良い。
図4は、第1の実施の形態の無線通信システムを構成する基地局のブロック図である。図4に示すように、第1の実施の形態の基地局150は、受信部151と、PLP判定部153と、制御部155と、送信部157とを備える。
第2の実施の形態の無線通信システムについて説明する。第2の実施の形態の無線通信システムは、端末及び第1の実施の形態の無線通信システムが備える基地局から構成される。
図5は、第2の実施の形態の無線通信システムを構成する端末を示すブロック図である。図5に示すように、第2の実施の形態の端末200は、受信部101と、報告制御部201と、制御部105と、送信部107とを備える。本実施形態の端末200が第1の実施の形態の端末100と異なる点は、報告作成部の構成である。そのため、本実施形態の端末200が備える構成要素において、第1の実施の形態の端末100の構成要素と同一の構成要素(受信部101、制御部105及び送信部107)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
第1の例は、アンカーキャリアに設定されている測定設定に基づいて、測定設定を作成する方法である。
第2の例は、PLPが発生したコンポーネントキャリアの測定設定に基づいて、測定設定を生成する方法である。なお、PLPが発生したコンポーネントキャリアがエクステンションキャリアであって測定設定がない場合には、当該エクステンションキャリアとセットで使用しているコンポーネントキャリアの測定設定に基づいて測定設定を生成する方法でも良い。
第4の例は、エクステンションキャリアの測定の場合、そのコンポーネントキャリアとセットになっているバックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアの測定設定に基づいて、測定設定を生成する方法である。
一つ目は、使用していないコンポーネントキャリアであること。
二つ目は、アンカーキャリアにおいてPLPが発生した場合、アンカーキャリアとして使用できるコンポーネントキャリアであること。
四つ目は、バックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアでPLPが発生した場合、バックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアのコンポーネントキャリアであること。
六つ目は、使用中のコンポーネントキャリアと同時に使用することのできるコンポーネントキャリアであること。
第3の実施の形態の無線通信システムについて説明する。第3の実施の形態の無線通信システムは、端末及び基地局から構成される。
図6は、第3の実施の形態の無線通信システムを構成する端末を示すブロック図である。図6に示すように、第3の実施の形態の端末300は、受信部101と、報告制御部301と、CQI報告作成部303と、測定結果報告作成部305と、制御部307と、送信部107とを備える。本実施形態の端末300が第1の実施の形態の端末100と異なる点は、報告制御部と制御部の構成である。そのため、本実施形態の端末300が備える構成要素において、第1の実施の形態の端末100の構成要素と同一の構成要素(受信部101及び送信部107)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
第1の例では、他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアでPLPが発生したか、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアでPLPが発生したかに応じて、モード判定部313は、自キャリアを監視するか、他キャリアを監視するかを判定する。他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアでPLPが発生した場合、モード判定部313は他キャリアを監視すると判定する。一方、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアでPLPが発生した場合、モード判定部313は自キャリアを監視すると判定する。
一つ目の例は、他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアが、バックワードコンパチブルキャリアとノンバックワードコンパチブルキャリアであり、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアが、エクステンションキャリアである。
二つ目の例は、他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアが、アンカーキャリアであり、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアが、アンカーキャリアのコンポーネントキャリア以外である。
三つ目の例は、他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアが、PDCCHを報知しているコンポーネントキャリアであり、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアが、PDCCHを報知していないコンポーネントキャリアである。
なお、他のコンポーネントキャリアに影響を及ぼすコンポーネントキャリアと、他のコンポーネントキャリアに影響を及ぼさないコンポーネントキャリアのセットは、上記の3通りのセット以外でも良い。
図8は、第3の実施の形態の端末300の動作を説明するためのフローチャートである。図8に示すように、端末300は、使用中のコンポーネントキャリア毎に基地局との同期を監視する(ステップS101)。続いて、端末300は、コンポーネントキャリア毎に、PLPを検知する(ステップS103)。端末300は、新たにコンポーネントキャリアが必要かどうかにより、端末300のモード切り替えを判定する(ステップS105)。端末300は、新たにコンポーネントキャリアが必要であると判定すると、他キャリア監視モードに移行する(ステップS107)。一方、端末300は、新たにコンポーネントキャリアが必要でないと判定すると、自キャリア監視モードに移行する(ステップS109)。
図9は、第3の実施の形態の無線通信システムを構成する基地局のブロック図である。図9に示すように、第3の実施の形態の基地局350は、受信部151と、PLP判定部351と、制御部155と、送信部157とを備える。本実施形態の基地局350が第1の実施の形態の基地局150と異なる点は、PLP判定部の構成である。そのため、本実施形態の基地局350が備える構成要素において、第1の実施の形態の基地局150の構成要素と同一の構成要素(受信部151、制御部155及び送信部157)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
図10及び図11は、第3の実施の形態の基地局350の動作を説明するためのフローチャートである。図10に示すように、基地局350は、測定結果報告(MR)又はCQI報告が入力されたかを判定する(ステップS201)。測定結果報告が入力されると、基地局350は、PLPが発生したことを示す値のコンポーネントキャリアのセルが当該測定結果報告に含まれているかどうかを判定する(ステップS203)。基地局350は、PLPが発生したことを示す値の、端末が使用しているコンポーネントキャリアのセルが測定結果報告に含まれていない場合、PLPは発生していないと判定する(ステップS205)。
第4の実施の形態の無線通信システムについて説明する。第4の実施の形態の無線通信システムは、端末及び第3の実施の形態の無線通信システムが備える基地局から構成される。
図12は、第4の実施の形態の無線通信システムを構成する端末を示すブロック図である。図12に示すように、第4の実施の形態の端末400は、受信部101と、報告制御部401と、CQI報告作成部303と、測定結果報告作成部305と、制御部307と、送信部107とを備える。本実施形態の端末400が第3の実施の形態の端末300と異なる点は、報告制御部が401有する他キャリア監視モード部の構成である。そのため、本実施形態の端末400が備える構成要素において、第3の実施の形態の端末300の構成要素と同一の構成要素(受信部101、CQI報告作成部303、測定結果報告作成部305、制御部307及び送信部107)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
第1の例は、アンカーキャリアに設定されている測定設定に基づいて、測定設定を作成する方法である。
第2の例は、PLPが発生したコンポーネントキャリアの測定設定に基づいて、測定設定を生成する方法である。なお、PLPが発生したコンポーネントキャリアがエクステンションキャリアであって測定設定がない場合には、当該エクステンションキャリアとセットで使用しているコンポーネントキャリアの測定設定に基づいて測定設定を生成する方法でも良い。
第4の例は、エクステンションキャリアの測定の場合、そのコンポーネントキャリアとセットになっているバックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアの測定設定に基づいて、測定設定を生成する方法である。
一つ目は、使用していないコンポーネントキャリアであること。
二つ目は、アンカーキャリアにおいてPLPが発生した場合、アンカーキャリアとして使用できるコンポーネントキャリアであること。
四つ目は、バックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアでPLPが発生した場合、バックワードコンパチブルキャリア又はノンバックワードコンパチブルキャリアのコンポーネントキャリアであること。
六つ目は、使用中のコンポーネントキャリアと同時に使用することのできるコンポーネントキャリアであること。
第5の実施の形態の無線通信システムについて説明する。第5の実施の形態の無線通信システムは、端末及び第3の実施の形態の無線通信システムが備える基地局から構成される。
図13は、第5の実施の形態の無線通信システムを構成する端末を示すブロック図である。図13に示すように、第5の実施の形態の端末500は、受信部101と、報告制御部501と、CQI報告作成部303と、測定結果報告作成部305と、制御部307と、送信部107とを備える。本実施形態の端末500が第3の実施の形態の端末300と異なる点は、報告制御部が有する自キャリア監視モード部の構成である。そのため、本実施形態の端末500が備える構成要素において、第3の実施の形態の端末300の構成要素と同一の構成要素(受信部101、CQI報告作成部303、測定結果報告作成部305、制御部307及び送信部107)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
第1の例は、PLPが発生したコンポーネントキャリアである。
第2の例は、アンカーキャリアである。
第3の例は、PLPが発生したコンポーネントキャリアに隣接している又は近いバックワードコンパチブルキャリアである。なお、ノンバックワードコンパチブルキャリアでも良い。
第4の例は、PLPが発生したコンポーネントキャリアが属する周波数帯と同じ周波数帯に属するコンポーネントキャリアである。
なお、上記の例を組み合わせてもよいし、上記の例以外の方法で基準となるコンポーネントキャリアを選定しても良い。
第6の実施の形態の無線通信システムについて説明する。第6の実施の形態の無線通信システムは、端末及び基地局から構成される。
図14は、第6の実施の形態の無線通信システムを構成する端末を示すブロック図である。図14に示すように、第6の実施の形態の端末600は、受信部101と、報告制御部603と、制御部605と、送信部107とを備える。本実施形態の端末600が第1の実施の形態の端末100と異なる点は、報告制御部603が有するディアクティベート監視部616及び報告作成部613、並びに、制御部605が有するエリア情報管理部617の構成である。そのため、本実施形態の端末600が備える構成要素において、第1の実施の形態の端末100の構成要素と同一の構成要素(受信部101及び送信部107)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
図17は、第6の実施の形態の無線通信システムを構成する基地局のブロック図である。図17に示すように、第6の実施の形態の基地局650は、受信部151と、PLP判定部153と、制御部655と、送信部157とを備える。本実施形態の基地局650が第1の実施の形態の基地局150と異なる点は、制御部の構成である。そのため、本実施形態の基地局650が備える構成要素において、第1の実施の形態の基地局150の構成要素と同一の構成要素(受信部151、PLP判定部153及び送信部157)については、同一の参照番号をそれぞれ付して、その詳細な説明は省略する。
以上、本発明に係る無線通信システムの実施の形態を説明したが、本発明の範囲はこれらに限定されるものではなく、請求項に記載された範囲内において目的に応じて変更又は変形することが可能である。
なお、上記各実施の形態において、PLPが発生したコンポーネントキャリアを端末がディアクティベーションする機能を保持してもよい。ここで、端末が基地局に信号を送る送信タイミングがコンポーネントキャリアによって異なり、送信タイミングが同じコンポーネントキャリアでグループを形成する場合、端末は、グループ毎に送信タイミングを管理し、グループ毎に送信タイミングを管理するためのダウンリンクの参照コンポーネントキャリア(DL Reference CC)を保持することを考える。このとき、さらに、グループ毎にPUCCHを持つ場合、ダウンリンクの参照コンポーネントキャリアにおいて、PLPが発生すると、グループ内のほかのコンポーネントキャリアにおいてもACK/NACKを送ることができなくなり、ダウンリンクでの受信ができなくなるため、それらのコンポーネントキャリアをディアクティベーションする機能を保持してもよい。複数のグループで一つのPUCCHを持つ場合において、PUCCHを持つグループのダウンリンクの参照コンポーネントキャリアにおいて、PLPが発生すると、それら複数のグループ内においてもACK/NACKを送ることができなくなり、ダウンリンクでの受信ができなくなるため、それらのコンポーネントキャリアをディアクティベーションする機能を保持しもよい。なお、ディアクティベーションの代わりに設定の削除を行う機能を保持してもよい。上記のように、監視しても使用できないコンポーネントキャリアをディアクティベーションあるいは、設定の削除を行うことにより、消費電力を低減することができる。
101 受信部
103,201,301,401,501,603 報告制御部
105,307,605 制御部
107 送信部
111,211,311,411,511 電波状況判定部
113,213,613 報告作成部
115,215,319,419,519 PLP判定部
150,350 無線通信基地局
151 受信部
153,351 PLP判定部
155,655 制御部
157 送信部
217 測定設定生成部
219 監視キャリア判定部
303 CQI報告作成部
305 測定結果報告作成部
313,413,513 モード判定部
315,415,515 自キャリア監視モード部
317,417,517 他キャリア監視モード部
421 測定設定生成部
423 監視キャリア判定部
521 監視周期判定部
616 ディアクティベート監視部
617 エリア情報管理部
Claims (11)
- 無線通信基地局が管理する複数の通信セルの各コンポーネントキャリアを同時に使用して前記無線通信基地局と通信可能な無線通信装置であって、
前記無線通信基地局から通信セル毎に送信された参照信号を受信する受信部と、
前記受信部が受信した参照信号に基づいて、当該無線通信装置の受信電波状況を判定する電波状況判定部と、
前記電波状況判定部による判定結果に基づいて、前記無線通信基地局に送信する報告を作成する報告作成部と、
前記報告を前記無線通信基地局に送信する送信部と、を備え、
前記電波状況判定部は、
当該無線通信装置と前記無線通信基地局の間の通信で使用されている又は使用され得るコンポーネントキャリア毎に物理層障害の発生を判定する物理層障害判定部を有し、
当該無線通信装置と前記無線通信基地局の間の通信で使用されている複数のコンポーネントキャリアの一部に物理層障害が発生したと前記物理層障害判定部が判定した際、どのコンポーネントキャリアで物理層障害が発生したかを前記報告作成部に通知し、
前記報告作成部は、
物理層障害が発生したコンポーネントキャリア及び所定の判定基準に応じた報告を作成することを特徴とする無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記報告作成部は、
物理層障害が発生したコンポーネントキャリアの代わりに使用可能なコンポーネントキャリアを判定する監視キャリア判定部と、
前記無線通信基地局が管理する前記複数の通信セルの少なくともいずれか1つのコンポーネントキャリアにおける参照信号の測定を設定する測定設定を生成する測定設定生成部と、を有し、
前記監視キャリア判定部が判定したコンポーネントキャリアの測定設定がある場合、当該測定設定を用いた測定結果に基づいて、当該コンポーネントキャリアが使用可能かを判定し、使用可能であれば当該コンポーネントキャリアの測定結果と、物理層障害が発生したコンポーネントキャリアの測定結果とを含む報告を生成し、
前記監視キャリア判定部が判定したコンポーネントキャリアの測定設定がない場合、当該コンポーネントキャリアの測定設定を生成するよう前記測定設定生成部に指示することを特徴とする無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記報告作成部は、
当該無線通信装置と前記無線通信基地局の間の通信で使用されている複数のコンポーネントキャリアの一部に物理層障害が発生したと前記物理層障害判定部が判定した際、前記所定の判定基準に基づいて、前記物理層障害が発生したコンポーネントキャリアの受信電波状況を監視するか、前記物理層障害が発生したコンポーネントキャリア以外のコンポーネントキャリアの受信電波状況を監視するかを判定する監視判定部と、
前記監視判定部が、前記物理層障害が発生したコンポーネントキャリアの受信電波状況を監視すると判定した場合、当該コンポーネントの測定結果が欠落した報告を作成する自キャリア監視モード報告作成部と、
前記監視判定部が、前記物理層障害が発生したコンポーネントキャリア以外のコンポーネントの受信電波状況を監視すると判定した場合、当該コンポーネントの測定結果と、前記物理層障害が発生したコンポーネントキャリアの測定結果とを含む報告を作成する他キャリア監視モード報告作成部と、を有することを特徴とする無線通信装置。 - 請求項1~3のいずれか一項に記載の無線通信装置であって、
前記所定の判定基準は、当該無線通信装置の能力であることを特徴とする無線通信装置。 - 請求項3に記載の無線通信装置であって、
前記他キャリア監視モード報告作成部は、
物理層障害が発生したコンポーネントキャリアの代わりに使用可能なコンポーネントキャリアを判定する監視キャリア判定部と、
前記無線通信基地局が管理する前記複数の通信セルの少なくともいずれか1つのコンポーネントキャリアにおける参照信号の測定を設定する測定設定を生成する測定設定生成部と、を有し、
前記監視キャリア判定部が判定したコンポーネントキャリアの測定設定がある場合、当該測定設定を用いた測定結果に基づいて、当該コンポーネントキャリアが使用可能かを判定し、使用可能であれば当該コンポーネントキャリアの測定結果と、物理層障害が発生したコンポーネントキャリアの測定結果とを含む報告を生成し、
前記監視キャリア判定部が判定したコンポーネントキャリアの測定設定がない場合、当該コンポーネントキャリアの測定設定を生成するよう前記測定設定生成部に指示することを特徴とする無線通信装置。 - 請求項3に記載の無線通信装置であって、
前記自キャリア監視モード報告作成部は、
前記複数のコンポーネントキャリア中の基準となるコンポーネントキャリアの受信電波状況に応じて、前記受信部による前記参照信号の受信周期を変更することを特徴とする無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記無線通信基地局から送られた通信セルの大きさの情報に基づいて、当該無線通信装置が使用している通信セルの大きさを管理するエリア情報管理部と、
ディアクティベートするよう前記無線通信基地局から通知されたコンポーネントキャリアの内、参照信号の測定を設定する測定設定がされているコンポーネントキャリアの少なくとも一つを監視するディアクティベート監視部と、を備え、
前記ディアクティベート監視部は、監視しているコンポーネントキャリアがある場合、前記監視しているコンポーネントキャリアのエリアが前記無線通信基地局から通知されたコンポーネントキャリアのエリアよりも小さいとき、監視するコンポーネントキャリアを前記無線通信基地局から通知されたコンポーネントキャリアに切り替えることを特徴とする無線通信装置。 - 請求項7に記載の無線通信装置であって、
前記ディアクティベート監視部は、アクティベートするよう前記無線通信基地局から通知されたコンポーネントキャリアを監視している場合、測定設定されディアクティベートされたコンポーネントキャリアが他になければ当該監視を停止し、測定設定されディアクティベートされたコンポーネントキャリアが他にあれば、監視しているコンポーネントキャリアのエリアの大きさ以上のコンポーネントキャリアを監視することを特徴とする無線通信装置。 - 複数の通信セルの各コンポーネントキャリアを同時に使用して請求項1~5のいずれか一項に記載の無線通信装置と通信可能な無線通信基地局であって、
前記無線通信装置から送信された報告を受信する受信部と、
前記報告から、前記無線通信装置と当該無線通信基地局の間の通信で使用されている複数のコンポーネントキャリアの一部に物理層障害が発生したかを判定する物理層障害判定部と、
前記物理層障害判定部による判定結果が、前記複数のコンポーネントキャリアの一部に物理層障害が発生したことを示す場合、当該物理層障害が発生したコンポーネントキャリアに対する無線リソースの割り当てを一時的に停止する制御部と、
参照信号を前記無線通信装置に送信する送信部と、
を備えたことを特徴とする無線通信基地局。 - 請求項9に記載の無線通信基地局であって、
当該無線通信基地局は、前記報告に前記複数のコンポーネントキャリア以外のコンポーネントキャリアに関する情報が含まれている場合、前記無線通信装置が当該コンポーネントキャリアを追加するよう要求していると判定することを特徴とする無線通信基地局。 - 無線通信基地局が管理する複数の通信セルの各コンポーネントキャリアを同時に使用して無線通信装置が前記無線通信基地局と通信可能な無線通信システムであって、
前記無線通信装置は、
前記無線通信基地局から通信セル毎に送信された参照信号を受信する受信部と、
前記受信部が受信した参照信号に基づいて、当該無線通信装置の受信電波状況を判定する電波状況判定部と、
前記電波状況判定部による判定結果に基づいて、前記無線通信基地局に送信する報告を作成する報告作成部と、
前記報告を前記無線通信基地局に送信する送信部と、を備え、
前記電波状況判定部は、
当該無線通信装置と前記無線通信基地局の間の通信で使用されている又は使用され得るコンポーネントキャリア毎に物理層障害の発生を判定する物理層障害判定部を有し、
当該無線通信装置と前記無線通信基地局の間の通信で使用されている複数のコンポーネントキャリアの一部に物理層障害が発生したと前記物理層障害判定部が判定した際、どのコンポーネントキャリアで物理層障害が発生したかを前記報告作成部に通知し、
前記報告作成部は、
物理層障害が発生したコンポーネントキャリア及び所定の判定基準に応じた報告を作成し、
前記無線通信基地局は、
前記無線通信装置から送信された報告を受信する受信部と、
前記報告から、前記無線通信装置と当該無線通信基地局の間の通信で使用されている複数のコンポーネントキャリアの一部に物理層障害が発生したかを判定する物理層障害判定部と、
前記物理層障害判定部による判定結果が、前記複数のコンポーネントキャリアの一部に物理層障害が発生したことを示す場合、当該物理層障害が発生したコンポーネントキャリアに対する無線リソースの割り当てを一時的に停止する制御部と、
参照信号を前記無線通信装置に送信する送信部と、を備えたことを特徴とする無線通信システム。
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