WO2015194570A1 - ユーザ装置、基地局、及び時間差情報通知方法 - Google Patents
ユーザ装置、基地局、及び時間差情報通知方法 Download PDFInfo
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- WO2015194570A1 WO2015194570A1 PCT/JP2015/067361 JP2015067361W WO2015194570A1 WO 2015194570 A1 WO2015194570 A1 WO 2015194570A1 JP 2015067361 W JP2015067361 W JP 2015067361W WO 2015194570 A1 WO2015194570 A1 WO 2015194570A1
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- 238000005259 measurement Methods 0.000 claims abstract description 325
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
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- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- 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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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
Definitions
- the present invention relates to a measurement gap (measurement gap) used in a mobile communication system such as LTE.
- Non-Patent Document 1 In a mobile communication system such as LTE, in order to connect the user apparatus UE to a higher quality cell, or for the purpose of load balancing, etc., a radio communication is performed by instructing the user apparatus UE using a RRC signal. Quality is measured (Non-Patent Document 1).
- measurement gap The period during which communication is interrupted is called a measurement gap (hereinafter, measurement gap).
- measurement gap The measurement gap is set to be visited periodically by measurement setting information (Measurement configuration) received from the base station eNB.
- the base station eNB since the user apparatus UE knows at which timing the measurement is performed, the DL / UL scheduling is stopped during the corresponding period.
- CA Carrier aggregation
- the user equipment UE sets a single measurement gap setting for all CCs even during CA. It is supposed to be applied to. That is, the user apparatus UE interrupts DL reception / UL transmission in all CCs during the measurement gap period. This is because if the measurement gap is defined for each CC, the implementation of the user apparatus UE becomes complicated.
- Non-Patent Document 2 the user apparatus UE performs communication using radio resources of two physically different base stations eNB at the same time.
- Dual connectivity (hereinafter referred to as DC) is a type of CA, also called Inter-eNB CA (Inter-Base Station Carrier Aggregation), and Master-eNB (MeNB) and Secondary-eNB (SeNB) have been introduced.
- the FIG. 3 shows an example of DC.
- MeNB communicates with user apparatus UE by CC # 1
- a cell (one or a plurality) under the MeNB is referred to as an MCG (Master Cell Group, master cell group), and a cell (one or a plurality) under the SeNB is referred to as an SCG (Secondary Cell Group, secondary cell group).
- the SCG cell to be added first is called PSCell (primary SCell).
- CA CA that is not DC
- DC it is assumed that the measurement gap for each user apparatus UE is applied without distinguishing the measurement gap between MCG and SCG from the viewpoint of simplifying the UE implementation. Is done.
- the measurement gap (SFN / subframe number to be a measurement gap) in LTE is calculated based on setting information (gap pattern (including period information), gap offset), but at a certain time, a subframe in MCG (MeNB) It is assumed that there is a difference between (SFN / subframe number) and a subframe (SFN / subframe number) in SCG (SeNB).
- the present invention has been made in view of the above points, and in connection with one embodiment, the present invention relates to a first base station and a second base station that communicate with a user apparatus by inter-base station carrier aggregation.
- a technique for enabling a base station to grasp information on a time difference between a subframe in a first base station and a subframe in a second base station is provided. With a purpose.
- the present invention makes it possible to appropriately set a measurement gap even when there is a shift in the subframe boundary between the first base station and the second base station.
- the purpose is to provide technology.
- the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, Measuring means for measuring a time difference between a subframe at the first base station and a subframe at the second base station;
- Measuring means for measuring a time difference between a subframe at the first base station and a subframe at the second base station;
- a user apparatus comprising notification means for notifying the first base station or the second base station of time difference information related to the time difference measured by the measurement means when a predetermined notification trigger is detected.
- the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation.
- a measurement gap for the first base station is set based on the setting information, and a subframe that overlaps a subframe that becomes a measurement gap for the first base station is set as a measurement gap for the second base station.
- a user device comprising a measurement control means is provided.
- the second base station in the mobile communication system including the first base station and the second base station that communicate with the user apparatus by inter-base station carrier aggregation.
- a base station Receiving means for receiving time difference information on a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station; Receive measurement gap setting information from the user apparatus or the first base station, calculate a measurement gap for the base station in the user apparatus based on the setting information and the time difference information, and perform the measurement
- a base station comprising measurement control means that considers a predetermined period before and after the gap as a measurement gap.
- the second base station in the mobile communication system including the first base station and the second base station that communicate with the user apparatus by inter-base station carrier aggregation.
- a base station Receiving means for receiving time difference information on a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station;
- An absolute time of a measurement gap for the first base station in the user device is calculated based on the measurement gap setting information and the time difference information received by the receiving unit, and based on the absolute time, the user device
- a measurement control means for calculating a measurement gap for the base station.
- the user apparatus used in the mobile communication system including the first base station and the second base station that communicate with the user apparatus by inter-base station carrier aggregation executes.
- a time difference information notification method A measuring step for measuring a time difference between a subframe at the first base station and a subframe at the second base station;
- a time difference information notification method comprising: a notification step of notifying the first base station or the second base station of time difference information related to the time difference measured in the measurement step when a predetermined notification trigger is detected. Is done.
- a subframe and a first base station in the first base station A technology is provided that enables the base station to recognize information on the time difference between the subframes in the two base stations.
- FIG. It is a figure for demonstrating the condition when there exists a shift
- LTE Long Term Evolution
- FIG. 5 shows a configuration example of the mobile communication system according to the embodiment of the present invention.
- the mobile communication system according to the present embodiment includes a base station MeNB and a base station SeNB that are respectively connected to the core network 10, and enables dual connectivity (DC) with the user apparatus UE. It is said. Further, the base station MeNB and the base station SeNB can communicate with each other through, for example, an X2 interface.
- the base station MeNB (which may be the base station SeNB) performs measurement gap setting for the user apparatus UE (step 101). More specifically, the setting is performed by a measurement configuration information element (measGapConfig) in the RRCConnectionReconfiguration message.
- measGapConfig measurement configuration information element
- the time length of the measurement gap is 6 ms (6 subframes), and the period (gap pattern: 40 ms or 80 ms) and the offset (gapOffset) are specified by measGapConfig.
- the user apparatus UE for which the measurement gap is set applies the measurement gap according to the setting (step 102). That is, the user apparatus UE performs an operation of interrupting DL and UL transmission / reception in a measurement gap starting from the SFN / subframe number calculated from the period (MGRP) and the offset.
- the user apparatus UE performs measurement (Step 103), and transmits a measurement report (Measurement report) (Step 104).
- the shift notification method example 1 is for notifying the time shift of the subframe between the MCG and the SCG when the base station SeNB (PSCell) is set (added). That is, it is notified as a trigger that the setting for performing carrier aggregation between base stations has been performed.
- PSCell base station SeNB
- the base station MeNB transmits a SeNB addition request to the base station SeNB that is a base station that becomes the SeNB (step 201).
- the base station SeNB returns a SeNB addition request confirmation response to the base station MeNB (step 202).
- the base station MeNB instructs the SeNB additional setting by transmitting an RRC signal (for example, RRCConnectionReconfiguration) to the user apparatus UE (step 203).
- RRC signal for example, RRCConnectionReconfiguration
- the user apparatus UE that has received the instruction adds SeNB (PSCell) and starts communication with the base station SeNB.
- SeNB SeNB
- the user apparatus UE based on a signal (synchronization signal, broadcast information, etc.) received from the base station MeNB and a signal (synchronization signal, broadcast information, etc.) received from the base station SeNB, Deviation is measured and deviation information (time difference information) is acquired.
- An example of deviation information (time difference information) will be described later.
- the user apparatus UE transmits a message indicating that the SeNB additional setting is complete (for example, RRCConnectionReconfigurationComplete) to the base station MeNB.
- a message indicating that the SeNB additional setting is complete for example, RRCConnectionReconfigurationComplete
- the message including the deviation information is transmitted from the base station MeNB to the base station SeNB (step 205).
- the deviation information is included in the SeNB additional setting completion message.
- the deviation information is transmitted before the SeNB additional setting completion transmission. Also good.
- the deviation information may be transmitted after the SeNB additional setting completion transmission. In any case, the deviation information is transmitted from the base station MeNB to the base station SeNB.
- notification of deviation information based on trigger detection may be performed from the user apparatus UE to the base station SeNB, or may be performed to both the base station MeNB and the base station SeNB. The same applies to the deviation notification method examples 2 and 3 described below.
- the deviation notification method example 2 is for notifying deviation information at the timing at which the measurement report of Event A2 is transmitted (the timing at which Event A2 is triggered).
- Event A2 notifies the measurement report about the cell from the user apparatus UE to the base station eNB when the reception strength / reception quality of the serving cell (the frequency is specified by the measurement setting) is deteriorated from a predetermined threshold. is there.
- Event A2 When Event A2 is triggered and a measurement report is transmitted, it is assumed that the base station MeNB sets a measurement gap in order to cause the user apparatus UE to measure the radio quality of another frequency. Then, the deviation information is notified at the timing when Event A2 is triggered. Note that Event A2 is merely an example, and misalignment information may be notified using another Event occurrence that is supposed to set a measurement gap as a trigger.
- the base station MeNB transmits a measurement setting message to the user apparatus UE (step 301).
- the measurement setting includes information indicating Event A2 as a report trigger.
- the user apparatus UE measures a predetermined frequency and detects that the trigger of Event A2 has occurred (reception quality etc. has deteriorated from a threshold value) (step 302).
- the user apparatus UE uses the above detection as a trigger or regardless of the above detection, and receives a signal (synchronization signal, broadcast information, etc.) received from the base station MeNB and a signal received from the base station SeNB (synchronization signal, broadcast). Based on the information etc.), the shift of the subframe between MCG and SCG is measured, and the shift information is obtained. And user apparatus UE includes deviation information in the measurement report of Event A2, and transmits (step 303). This deviation information is notified from the base station MeNB to the base station SeNB (step 304).
- the deviation information may be transmitted as a separate signal after the measurement report is transmitted. Good. Also in this case, the deviation information is notified from the base station MeNB to the base station SeNB. When reporting with another signal, the UL data amount report may not be triggered for the data. That is, the Regular BSR may not be triggered. Alternatively, the scheduling request transmission may not be triggered. In this case, transmission is performed by UL grant allocated from the base station MeNB or SeNB when other UL data is generated.
- the user apparatus UE since the user apparatus UE notifies the deviation information only when there is a possibility that the measurement gap is set, it is possible to reduce unnecessary UL control signals.
- deviation notification method example 3 notifies deviation information when the user apparatus UE receives an RRC signal (eg, RRCConnectionReconfiguration) for setting a measurement gap from the base station MeNB.
- RRC signal eg, RRCConnectionReconfiguration
- notification of deviation information may be performed only when an information element (for example, measGapConfig) for setting a measurement gap is included in the RRC signal.
- information for setting a measurement gap is used. Assume that the element is included.
- the user apparatus UE may notify the shift information only when it is detected that the user apparatus UE is asynchronous (there is a shift).
- the NW side specifically, the base station MeNB
- the NW side can implicitly grasp that there is no deviation because there is no report.
- deviation notification method example 3 since deviation information can be notified when the measurement gap is actually set, it is possible to reduce unnecessary UL control signals compared to the deviation notification method example 2. is there.
- Base station MeNB transmits the RRC signal which performs a measurement gap setting with respect to user apparatus UE (step 401).
- the user apparatus UE measures the subframe shift between the MCG and the SCG as described above, and acquires the shift information.
- the user apparatus UE determines to transmit deviation information when there is a deviation, and first determines whether or not the amount of deviation is greater than or equal to a predetermined threshold (step 402). If the determination result in step 402 is No, the passing information is not notified (step 406).
- step 402 If the determination result in step 402 is Yes, the user apparatus UE notifies the base station MeNB of the deviation information (step 403).
- the deviation information is transmitted from the base station MeNB to the base station SeNB (step 404).
- the deviation information in step 403 may be notified by being included in a complete message (eg, RRCConnectionReconfigurationComplete) for the RRC signal that sets the measurement gap.
- a complete message eg, RRCConnectionReconfigurationComplete
- the deviation information notified by the user apparatus UE to the base station MeNB may be any information as long as it is information that can grasp the amount of deviation on the base station MeNB or SeNB side. For example, refer to FIGS. 10A, 10B, and 11. It can be the information explained.
- the time difference information may be time, the number of subframes, or other information. Note that the SFN and subframe number of each base station can be determined from broadcast information broadcast from the base station, for example.
- the example of FIG. 10A measures the time difference with the corresponding subframe of the base station SeNB (SCG) after the start end of the subframe of the base station MeNB (MCG), and notifies it as deviation information.
- SCG base station SeNB
- MCG base station MeNB
- the base station SeNB sets measurement gap setting information (gap pattern, gap offset, etc.) set from the base station MeNB to the user apparatus UE. And the measurement gap setting information is held.
- the SFN and subframe number used as the starting point of the measurement gap are calculated from a predetermined calculation formula when the deviation is not considered. Further, by applying the above-described deviation information (time difference) to the calculated measurement gap, a measurement gap (period in which DL / UL scheduling is not performed) taking the deviation into consideration is calculated. Applying the shift information (time difference) to the measurement gap means that the measurement gap of the MCG and the measurement gap of the SCG are aligned as much as possible.
- FIG. 11 is a diagram for explaining the deviation information example 2.
- the deviation information example 2 is for calculating and notifying the gap pattern and the gap offset in the SCG so that the MCG and the SCG are aligned in consideration of the subframe deviation between the MCG and the SCG in the user apparatus UE.
- the user apparatus UE calculates the SCG measurement gap from the gap pattern and gap offset in the SCG.
- the base station SeNB By calculating the deviation information as in the deviation information example 2 and notifying the base station SeNB, there is no need to exchange information of the measurement gap setting information (MG config) between the MeNB and SeNB, and NW implementation simplification and X2 Signal reduction is possible.
- the user apparatus UE may notify the SeNB of setting information (gap pattern and gap offset) received from the base station MeNB without correction.
- the base station SeNB can calculate a measurement gap aligned with the MCG side based on separately acquired shift information.
- FIG. 12 shows the situation when there is a subframe boundary shift between MCG and SCG.
- the periods A to B in the MCG and the periods C to D in the SCG are periods calculated as measurement gaps based on the setting information (and deviation information), respectively.
- the subframe indicated by E on the MeNB (MCG) side is not a measurement gap when viewed from MCG, but is the timing of the measurement gap when viewed from SCG. Therefore, in the subframe indicated by E, the user apparatus UE also applies to the MCG. Transmission / reception is not possible. Further, the base station MeNB cannot perform UL / DL scheduling in the E subframe.
- the subframe indicated by F on the SeNB (SCG) side is not a measurement gap when viewed from SCG, but is the timing of the measurement gap when viewed from MCG. Therefore, in the subframe indicated by F, the user apparatus UE also applies to the SCG. Transmission / reception is not possible.
- the base station SeNB cannot perform UL / DL scheduling in the F subframe.
- the scheduling unit and the transmission / reception disabled unit are subframe units.
- the measurement gap can be easily set independently between the MeNB and SeNB, the situation shown in FIG. 12 does not become a problem, but actually, the measurement gap is set independently between the MeNB and SeNB. This is difficult in terms of UE implementation. Therefore, in the present embodiment, it is assumed that a common measurement gap is set between the MeNB and SeNB.
- a countermeasure is taken when there is a shift in the subframe boundary.
- coping method example 1 and coping method example 2 will be described. By taking such measures, it is possible to appropriately set a common measurement gap between the MeNB and SeNB, and to simplify the UE implementation.
- Example 1 of coping method when there is a shift in the subframe boundary user apparatus UE does not perform transmission / reception in a predetermined period before and after the measurement gap (for example, 1 subframe, 1 ms) in both MCG and SCG.
- the base station MeNB / SeNB does not perform DL / UL scheduling before and after the measurement gap in the subordinate CC (CG).
- the user apparatus UE regards the measurement gap of MCG and SCG as the transmission / reception impossible timing (addition of measurement gap) before and after the calculated measurement gap.
- each of the base stations MeNB and SeNB considers the time before and after the measurement gap calculated by itself as DL / UL scheduling disabled timing (additional measurement gap).
- FIG. 13 shows the coping method 1 in the same situation as FIG.
- MCG MeNB
- E MeNB
- E the MeNB
- SCG SeNB
- F and H subframes before and after the measurement gap the user apparatus UE cannot transmit / receive
- the base station SeNB cannot perform DL / UL scheduling. That is, F to H are regarded as measurement gaps.
- the predetermined period may not be provided.
- the user apparatus UE can use the shift information measured by itself, and the base station MeNB / SeNB can use the shift information notified from the user apparatus UE. Moreover, the base station MeNB / SeNB exchanges information between the SFN / subframe and the subframe boundary by exchanging information between the base station MeNB and the base station SeNB without receiving notification of the deviation information from the user apparatus UE.
- the measurement gap may be calculated in consideration of the deviation, and the magnitude of the deviation may be determined.
- the base station transmits an instruction to the user apparatus UE to regard the time before and after the measurement gap as the transmission / reception impossible timing (step 501).
- This instruction may be performed only when the boundary deviation is equal to or greater than a predetermined threshold in the base station (MeNB or SeNB). If this instruction is not given, the following processing need not be performed.
- the instruction may be defined as new cap setting information, or may be a new RRC signal, MAC signal, or PHY signal.
- the user apparatus UE determines whether or not the shift amount of the subframe boundary between the MCG and the SCG is greater than or equal to a threshold (step 502). If the determination result in step 502 is Yes (deviation is greater than or equal to the threshold value), the transmission / reception impossible timing is assumed before and after the measurement gap (MG) for each of the MCG and SCG (considered as a measurement gap) (step 503). If the determination result in step 502 is No (the deviation is less than the threshold value), the measurement gap calculated from the setting information or the like is used without setting the transmission / reception impossible timing before and after the measurement gap (MG) (step 504). .
- coping method example 2 for the SCG side, the user equipment UE and the base station SeNB do not calculate the timing of the measurement gap using the gap pattern and the gap offset, but calculate the timing of the measurement gap based on TimeStamp (absolute time). To do.
- the user apparatus UE calculates the measurement gap using the measurement gap setting (gap pattern and gap offset) from the base station MeNB (or the base station SeNB), and the measurement gap on the MCG side illustrated in FIG. 15 is obtained.
- the measurement gap setting (gap pattern and gap offset) from the base station MeNB (or the base station SeNB)
- the 6 subframes on the MCG side serving as measurement gaps for MCG overlap in the time domain with the subframes serving as measurement gaps for SCG. More specifically, in the example of FIG. 15, 6 subframes on the MCG side serving as a measurement gap for MCG are included in 7 subframes serving as a measurement gap for SCG in the time domain.
- the base station SeNB obtains the deviation information (time difference) between the MCG and the SCG, and uses the deviation information, the same as the user apparatus UE described above. Process. That is, in the example of FIG. 15, the base station SeNB has the measurement gap setting information, and calculates the SFN / subframe number that becomes the measurement gap (corresponding to the measurement gap of the MCG in FIG. 15).
- the period during which scheduling cannot be performed is only 6 ms, and there is no additional transmission / reception disabled period / schedulable disabled period. That is, since the MCG side is not affected by the measurement gap from the SCG side, it is not necessary to increase the non-schedulable period as compared with the existing LTE (6 ms), and a decrease in throughput can be avoided.
- the period of the measurement gap is one subframe longer than that of the MCG side, but the transmission / reception disabled period / scheduling disabled period is less than the countermeasure method example 1.
- the transmission / reception disabled period / scheduling disabled period in the SCG may not be provided. Even in this case, a subframe overlapping with a subframe serving as a measurement gap for MCG is set as a measurement gap for SCG.
- the user apparatus UE can use the shift information measured by itself, and the base station MeNB / SeNB can use the shift information notified from the user apparatus UE. Moreover, the base station MeNB / SeNB exchanges information between the SFN / subframe and the subframe boundary by exchanging information between the base station MeNB and the base station SeNB without receiving notification of the deviation information from the user apparatus UE.
- the measurement gap may be calculated in consideration of the deviation, and the magnitude of the deviation may be determined.
- the measurement gap can be appropriately set even when there is a shift in the subframe boundary between the MCG and the SCG.
- FIG. 16 illustrates a configuration example of the user apparatus UE that performs the operations described so far. Note that FIG. 16 shows only functional units that are particularly related to the embodiment of the present invention in the user apparatus UE, and has at least a function (not shown) for performing an operation based on the LTE scheme.
- the user apparatus UE includes a DL signal reception unit 101, a UL signal transmission unit 102, a DC / CA management unit 103, a measurement control unit 104, a deviation measurement unit 105, and a deviation information notification unit. 106.
- the DL signal receiving unit 101 receives a radio signal from a base station (MeNB, SeNB) and extracts information from the radio signal.
- UL signal transmission part 102 produces
- the DC / CA management unit 103 performs management of each cell (CC) constituting the DC (retention of set CC identification information and status, etc.), addition, deletion, activation, deactivation, and the like.
- the measurement control unit 104 performs quality measurement of a predetermined frequency, comparison with a threshold, measurement report trigger detection, and the like based on measurement setting information (for example, an instruction of Event A2) received from a base station MeNB (may be SeNB) . Further, the measurement control unit 104 calculates a measurement gap (SFN / subframe to be a measurement gap) based on measurement gap (MG) setting information (gap pattern, gap offset, etc.), and for MCG, the period of the measurement gap Then, control to disable transmission / reception is performed. In addition, for the SCG, the measurement control unit 104 corrects the calculated measurement gap based on the deviation information measured by the deviation measurement unit 105, and performs control to disable transmission / reception of the corrected measurement gap. Do.
- the measurement control unit 104 also handles the above-described shift of the subframe boundary. For example, the measurement control unit 104 sets the measurement gap for the MCG based on the setting information, and sets the SCG side subframe that overlaps the MCG side subframe that becomes the measurement gap for the MCG as the measurement gap for the SCG. For example, the measurement control unit 104 sets a measurement gap for the MCG based on the setting information, and sets a measurement gap longer by one subframe than the measurement gap for the MCG as the measurement gap for the SCG.
- the deviation measuring unit 105 measures the timing deviation between the MCG and the SCG based on the signal received from the base station MeNB and the signal received from the base station SeNB. For example, the deviation as described with reference to FIGS. Calculate (acquire) information. As described with reference to FIGS. 7 to 9 and the like, the deviation information notification unit 106 notifies deviation information to the base stations (MeNB, SeNB) based on a predetermined trigger.
- the user apparatus UE can execute all the operations of the user apparatus UE described so far, but some operation examples will be described below.
- FIG. 17 shows a flowchart of an operation example related to deviation information notification in the user apparatus UE.
- the deviation measuring unit 105 of the user apparatus UE measures, for example, the deviation of the subframe between the MCG and the SCG periodically, and can notify the deviation information according to the occurrence of the trigger.
- the deviation information may be acquired by performing measurement upon generation of a trigger.
- the deviation information notification unit 106 determines whether or not a deviation information notification trigger has been detected. When a trigger is detected (for example, reception of an MG setting signal), the deviation information notification unit 106 notifies deviation information, for example, to the base station MeNB via the UL signal transmission unit 102 (step 602).
- FIG. 18 shows a flowchart of an operation example related to coping method example 1 when there is a shift in the subframe boundary.
- step 701 the measurement control unit 104 of the user apparatus UE receives the measurement gap (MG) setting information from the base station MeNB and receives the measurement gap setting.
- MG measurement gap
- the measurement control unit 104 makes an inquiry to the DC / CA management unit 103 to check whether DC is set, that is, whether MCG and SCG are set (step 702).
- Step 703 the measurement control unit 104 calculates the measurement gap (SFN / subframe number at which the measurement gap starts) of the MCG, and further displays the deviation information.
- the measurement control unit 104 calculates the measurement gap (SFN / subframe number at which the measurement gap starts) of the MCG, and further displays the deviation information.
- a predetermined period before and after the calculated measurement gap eg, 1 ms
- control is performed to disable transmission / reception in the measurement gap.
- Step 702 when DC is not set (No in Step 702), the process proceeds to Step 704, and the measurement control unit 104 calculates the measurement gap (SFN / subframe number at which the measurement gap starts) of the serving cell. Control to disable transmission / reception in the measurement gap is performed.
- FIG. 19 shows a flowchart of an operation example related to coping method example 2 when there is a shift in the subframe boundary.
- Step 801 the measurement control unit 104 of the user apparatus UE receives the measurement gap (MG) setting information from the base station MeNB and receives the measurement gap setting.
- MG measurement gap
- the measurement control unit 104 makes an inquiry to the DC / CA management unit 103 to check whether DC is set, that is, whether MCG and SCG are set (step 802).
- Step 802 If DC is set (Yes in Step 802), the process proceeds to Step 803, and the measurement control unit 104 calculates the MCG measurement gap (SFN / subframe number at which the measurement gap starts).
- the measurement control unit 104 acquires the absolute time of the measurement gap of the MCG (eg, time T in FIG. 15), and calculates the measurement gap for the SCG based on the absolute time.
- the measurement control unit 104 performs control to disable transmission / reception in the measurement gap in each of the MCG and SCG. That is, a measurement gap is set for each of MCG and SCG.
- Step 802 when DC is not set (No in Step 802), the process proceeds to Step 804, and the measurement control unit 104 calculates the measurement gap (SFN / subframe number at which the measurement gap starts) of the serving cell. Control to disable transmission / reception in the measurement gap is performed.
- the configuration (functional category) of the apparatus shown in FIG. 16 is merely an example.
- the mounting method (specific arrangement of functional units and the like) is not limited to a specific mounting method.
- the user device according to the present embodiment can be configured as a device including the following functional means.
- the user apparatus in the present embodiment is the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, Measuring means for measuring a time difference between a subframe in the first base station and a subframe in the second base station; and the time difference measured by the measuring means when a predetermined notification trigger is detected. It is comprised as a user apparatus provided with the notification means to notify the time difference information regarding the said 1st base station or the said 2nd base station. With this configuration, it is possible for the base station side to grasp information on the time difference between the subframe in the first base station and the subframe in the second base station.
- the predetermined notification trigger is, for example, that the user apparatus has received a setting signal for performing the inter-base station carrier aggregation from the first base station or the second base station.
- the user apparatus can notify the time difference information only when there is a possibility that a time difference occurs.
- the predetermined notification trigger may be that an event of transmitting a measurement report is triggered when the reception quality of a serving cell deteriorates below a predetermined threshold in the user apparatus.
- the user apparatus can notify time difference information when there is a possibility that a measurement gap is set.
- the predetermined notification trigger may be reception of measurement gap setting information from the first base station or the second base station.
- the time difference information can be notified only when the measurement gap is set.
- the user apparatus in this Embodiment is the said user apparatus used in the mobile communication system containing the 1st base station and 2nd base station which communicate with a user apparatus by the carrier aggregation between base stations, Receiving means for receiving measurement gap setting information from the first base station or the second base station; and setting a measurement gap for the first base station based on the setting information; and As a measurement gap for the base station, a measurement apparatus configured to set a measurement gap longer by one subframe than the measurement gap for the first base station may be configured. With this configuration, unnecessary DL reception / UL transmission due to subframe boundary deviation can be avoided, and a decrease in resource utilization efficiency can be prevented.
- the user apparatus in this Embodiment is the said user apparatus used in the mobile communication system containing the 1st base station and 2nd base station which communicate with a user apparatus by the carrier aggregation between base stations, Receiving means for receiving measurement gap setting information from the first base station or the second base station; and setting a measurement gap for the first base station based on the setting information; and You may comprise as a user apparatus provided with the measurement control means which sets the sub-frame which overlaps with the sub-frame used as the measurement gap with respect to a base station as a measurement gap with respect to said 2nd base station.
- the measurement control means calculates a measurement gap for the first base station based on the setting information, acquires an absolute time of the measurement gap, and measures for the second base station based on the absolute time.
- the gap may be calculated.
- FIG. 20 shows a configuration example of the base station eNB that performs the operations described so far. Since the base stations MeNB and SeNB have basically the same configuration, FIG. 20 shows a configuration that can be applied to both the MeNB and SeNB. In addition, when only the base station MeNB performs RRC connection with the user apparatus UE, only the measurement control unit 204 of the base station MeNB may have a function of performing measurement setting using an RRC signal.
- FIG. 20 shows only functional units that are particularly related to the embodiment of the present invention in the base station eNB, and has at least a function (not shown) for performing an operation based on the LTE scheme.
- the base station eNB of this embodiment includes a DL signal transmission unit 201, a UL signal reception unit 202, a DC / CA management unit 203, a measurement control unit 204, a scheduling unit 205, and a deviation information acquisition unit 206. And an inter-base station communication unit 207.
- the DL signal transmission part 201 produces
- the UL signal receiving unit 202 receives a radio signal from the user apparatus UE and extracts information from the radio signal.
- the DC / CA management unit 203 performs management of each cell (CC) constituting the DC (retention of set CC identification information and state, etc.), addition, deletion, activation, deactivation, and the like.
- the measurement control unit 204 transmits measurement setting information (Event instruction, measurement gap setting, etc.) to the user apparatus UE.
- the measurement control unit 204 transmits / receives (shares) measurement setting information to / from other base stations (e.g., SeNB for MeNB, MeNB for SeNB, and the like) via the inter-base station communication unit 207.
- the measurement control unit 204 calculates a measurement gap (SFN / subframe number at which the measurement gap starts) based on the measurement gap setting for the user apparatus UE, and notifies the scheduling unit 205 of the period of the measurement gap.
- the calculation of the measurement gap includes correction based on deviation information in the SeNB, addition of a period regarded as a measurement gap, and the like.
- the scheduling unit 205 performs control not to perform UL / DL scheduling for the period of the measurement gap notified from the measurement control unit 204 (including a period considered to be a measurement gap).
- the deviation information acquisition unit 206 acquires deviation information from the user apparatus UE or another base station (eg, MeNB for SeNB), and passes the deviation information to the measurement control unit 204.
- the inter-base station communication unit 207 transmits / receives information to / from other base stations.
- the base station eNB can execute all the operations of the base stations (MeNB, SeNB) described so far, but some operation examples will be described below.
- FIG. 21 shows a flowchart of an operation example related to coping method example 1 when there is a shift in the subframe boundary.
- step 901 the measurement control unit 204 of the base station eNB transmits measurement gap (MG) setting information to the user apparatus UE, thereby setting the measurement gap for the user apparatus UE.
- MG measurement gap
- the measurement control unit 204 makes an inquiry to the DC / CA management unit 203 to determine whether DC is set, that is, whether the base station eNB is a MeNB or SeNB (the MCG and SCG between itself and other base stations Whether it is set or not) (step 902).
- Step 903 the measurement control unit 204 sets the measurement gap (SFN / subframe number at which the measurement gap starts) of the MCG (if it is MeNB). calculate.
- the measurement control unit 204 calculates the MCG measurement gap and calculates the SCG measurement gap (SFN / subframe number at which the measurement gap starts) using, for example, the deviation information received from the MeNB. To do. Further, in any case, a predetermined period before and after the calculated measurement gap (eg, 1 ms) is also regarded as a measurement gap, and the scheduling unit 205 performs control not to perform UL / DL scheduling in the measurement gap.
- Step 902 when DC is not set (No in Step 902), the process proceeds to Step 904, and the measurement control unit 204 calculates the measurement gap (SFN / subframe number at which the measurement gap starts) of the serving cell. Control not performing UL / DL scheduling in the measurement gap is performed.
- FIG. 22 shows a flowchart of an operation example related to coping method example 2 when there is a shift in subframe boundaries.
- the operation in FIG. 22 is an operation example when the base station eNB is a SeNB.
- the measurement control unit 204 receives setting information of the measurement gap (MG) from the base station MeNB (or the user apparatus UE). Based on the setting information, the measurement control unit 204 calculates the MCG measurement gap (SFN / subframe number at which the measurement gap starts), and calculates the absolute time of the MCG measurement gap (eg, time T in FIG. 15). Obtaining and calculating a measurement gap for SCG (a period to be regarded as a measurement gap) based on the absolute time, and the scheduling unit 205 performs control without performing scheduling in the period.
- MG measurement gap
- the configuration (functional division) of the apparatus shown in FIG. 20 is merely an example.
- the mounting method (specific arrangement of functional units and the like) is not limited to a specific mounting method.
- the base station of the present embodiment can be configured as a device including the following functional units.
- the base station in the present embodiment is used as the second base station in a mobile communication system including a first base station and a second base station that communicate with a user apparatus by inter-base station carrier aggregation.
- a base station that receives time difference information related to a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station.
- Measurement gap setting information is received from the receiving means and the user apparatus or the first base station, and a measurement gap for the base station in the user apparatus is calculated based on the setting information and the time difference information And it is comprised as a base station provided with the measurement control means which considers the predetermined period before and behind the said measurement gap also as a measurement gap.
- the time difference information between the subframe in the first base station and the subframe in the second base station can be grasped by the base station, and unnecessary scheduling due to subframe boundary deviation can be avoided. Therefore, it is possible to prevent a decrease in resource utilization efficiency.
- the base station of the present embodiment is used as the second base station in a mobile communication system including a first base station and a second base station that communicate with a user apparatus by inter-base station carrier aggregation.
- a base station that receives time difference information related to a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station.
- the absolute time of the measurement gap for the first base station in the receiving means and the user device is calculated based on the setting information of the measurement gap and the time difference information received by the receiving means, and based on the absolute time
- the base station may comprise measurement control means for calculating a measurement gap for the base station in the user apparatus. With this configuration, the base station can grasp the information on the time difference between the subframe in the first base station and the subframe in the second base station, and increase the communication disabled period due to the subframe boundary shift. Can be reduced.
- the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, Measuring means for measuring a time difference between a subframe at the first base station and a subframe at the second base station; A notification means for notifying the first base station or the second base station of time difference information related to the time difference measured by the measurement means when a predetermined notification trigger is detected; apparatus.
- the predetermined notification trigger is that the user apparatus has received a setting signal for performing inter-base station carrier aggregation from the first base station or the second base station.
- the said predetermined notification trigger is that the event which transmits a measurement report when the reception quality of a serving cell deteriorates below a predetermined threshold in the said user apparatus was triggered.
- the 1st characterized by the above-mentioned.
- User equipment The user apparatus according to claim 1, wherein the predetermined notification trigger is reception of measurement gap setting information from the first base station or the second base station.
- the measurement gap setting information is received from the first base station or the second base station, the measurement gap for the first base station is calculated based on the setting information, and the setting information and the time difference information are A measurement control means for calculating a measurement gap with respect to the second base station based on the measurement gap, and regarding each of the calculated measurement gaps as a measurement gap before and after the measurement gap is also provided.
- the user device according to any one of four items.
- (Section 6) Receive measurement gap setting information from the first base station or the second base station, calculate a measurement gap for the first base station based on the setting information, and obtain an absolute time of the measurement gap
- the user apparatus according to any one of claims 1 to 4, further comprising: a measurement control unit that calculates a measurement gap for the second base station based on the absolute time.
- the time difference information is setting information used for calculating in the second base station a measurement gap obtained by correcting the time difference from the measurement gap for the first base station.
- Item 5 The user device according to any one of Items 1 to 4.
- a base station used as the second base station in a mobile communication system including a first base station and a second base station that communicate with a user apparatus by inter-base station carrier aggregation, Receiving means for receiving time difference information on a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station; Receive measurement gap setting information from the user apparatus or the first base station, calculate a measurement gap for the base station in the user apparatus based on the setting information and the time difference information, and perform the measurement
- a base station comprising: a measurement control unit that regards a predetermined period before and after the gap as a measurement gap.
- a base station used as the second base station in a mobile communication system including a first base station and a second base station that communicate with a user apparatus by inter-base station carrier aggregation, Receiving means for receiving time difference information on a time difference between a subframe in the first base station and a subframe in the second base station from the user apparatus or the first base station; An absolute time of a measurement gap for the first base station in the user device is calculated based on the measurement gap setting information and the time difference information received by the receiving unit, and based on the absolute time, the user device And a measurement control means for calculating a measurement gap for the base station.
- a time difference information notification method executed by the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, A measuring step for measuring a time difference between a subframe at the first base station and a subframe at the second base station; A notification step of notifying the first base station or the second base station of time difference information related to the time difference measured in the measurement step when a predetermined notification trigger is detected.
- Information notification method executed by the user apparatus used in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, A measuring step for measuring a time difference between a subframe at the first base station and a subframe at the second base station; A notification step of notifying the first base station or the second base station of time difference information related to the time difference measured in the measurement step when a predetermined notification trigger is detected.
- the functional configuration of the user device described in the present embodiment may be a configuration realized by executing a program by a CPU (processor) in a user device including a CPU and a memory.
- the configuration may be realized by hardware such as a hardware circuit provided with the processing logic described in the above, or a program and hardware may be mixed.
- the functional configuration of the base station described in the present embodiment may be a configuration realized by executing a program by a CPU (processor) in a base station including a CPU and a memory.
- the configuration may be realized by hardware such as a hardware circuit provided with the processing logic described in the above, or a program and hardware may be mixed.
- the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
- the user apparatus and the base station have been described using functional block diagrams, but each of such apparatuses may be implemented by hardware, software, or a combination thereof.
- Software operating in accordance with the present invention includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable It may be stored in any storage medium.
- RAM random access memory
- ROM read only memory
- EPROM EPROM
- EEPROM electrically erasable programmable read only memory
- registers registers
- HDD hard disk
- removable disk CD-ROM
- database database
- server server and other suitable It may be stored in any storage medium.
- the present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from
- UE user apparatus MeNB SeNB base station 101 DL signal receiving unit 102 UL signal transmitting unit 103 DC / CA managing unit 104 Measurement control unit 105 Deviation measuring unit 106 Deviation information notifying unit 201 DL signal transmitting unit 202 UL signal receiving unit 203 DC / CA management unit 204 Measurement control unit 205 Scheduling unit 206 Deviation information acquisition unit 207 Inter-base station communication unit
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Abstract
Description
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定手段と、
所定の通知トリガを検出した場合に、前記測定手段により測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知手段とを備えるユーザ装置が提供される。
前記第1の基地局又は前記第2の基地局から測定ギャップの設定情報を受信する受信手段と、
前記設定情報に基づいて前記第1の基地局に対する測定ギャップを設定するとともに、前記第1の基地局に対する測定ギャップとなるサブフレームと重なるサブフレームを前記第2の基地局に対する測定ギャップとして設定する測定制御手段とを備えるユーザ装置が提供される。
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置、又は、前記第1の基地局から、測定ギャップの設定情報を受信し、当該設定情報と前記時間差情報に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出し、当該測定ギャップの前後所定期間も測定ギャップと見なす測定制御手段とを備える基地局が提供される。
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置における前記第1の基地局に対する測定ギャップの絶対時間を、当該測定ギャップの設定情報と前記受信手段により受信した前記時間差情報とに基づき算出し、当該絶対時間に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出する測定制御手段とを備える基地局が提供される。
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定ステップと、
所定の通知トリガを検出した場合に、前記測定ステップにより測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知ステップとを備える時間差情報通知方法が提供される。
図5に本発明の実施の形態に係る移動通信システムの構成例を示す。図5に示すように、本実施の形態に係る移動通信システムは、それぞれコアネットワーク10に接続される基地局MeNBと基地局SeNBを備え、ユーザ装置UEとの間でDual connectivity(DC)を可能としている。また、基地局MeNBと基地局SeNBとの間は、例えばX2インターフェースにより通信可能である。
前述したように、MCG、SCG間でサブフレームレベルで測定ギャップを揃えるためには、MCGとSCG間のSFN/サブフレーム番号のずれを基地局側で把握しておく必要がある。本実施の形態では、ユーザ装置UEが当該ずれの情報を基地局側に通知することとしており、以下、その方法として、ずれの通知方法例1~3について説明する。
まず、ずれ通知方法例1を説明する。ずれ通知方法例1は、基地局SeNB(PSCell)を設定(追加)した際に、MCGとSCG間のサブフレームの時間のずれを通知するものである。つまり、基地局間キャリアアグリゲーションを行うための設定を行ったことをトリガとして通知する。
次に、ずれ通知方法例2を説明する。ずれ通知方法例2は、Event A2の測定報告を送信するタイミング(Event A2がトリガされたタイミング)で、ずれ情報を通知するものである。
次に、ずれ通知方法例3を説明する。ずれ通知方法例3は、ユーザ装置UEが基地局MeNBから測定ギャップを設定するRRC信号(例:RRCConnectionReconfiguration)を受信した時点でずれ情報を通知するものである。なお、RRC信号に測定ギャップを設定する情報要素(例:measGapConfig)が含まれている場合にのみずれ情報の通知を行うこととしてもよく、以下で説明するシーケンス例では、測定ギャップを設定する情報要素が含まれることを想定している。
ユーザ装置UEが基地局MeNBに通知するずれ情報は、基地局MeNBもしくはSeNB側でずれの量を把握できる情報であればどのような情報でもよいが、例えば図10A、10B、図11を参照して説明する情報とすることができる。
図4Bに示したように、MCGとSCG間でサブフレーム境界にずれがある場合、上記のようにSFN/サブフレームを揃えるような調整を行ったとしても、サブフレーム境界のずれている分だけMeNBとSeNB間で互いの測定ギャップが重ならない部分が発生する。そのため、DL受信/UL送信等を不要にトライする可能性があり、リソース利用効率低下やUL干渉によるシステムスループットが低下する可能性がある。
サブフレーム境界にずれがある場合の対処方法例1では、ユーザ装置UEはMCGとSCGの両方において測定ギャップ前後の所定期間(例:1サブフレーム分、1ms)で送受信を行わないこととする。また、基地局MeNB/SeNBは配下のCC(CG)において、測定ギャップの前後はDL/ULスケジューリングを行わないこととする。
対処方法例2では、SCG側について、ユーザ装置UE及び基地局SeNBはそれぞれ、ギャップパターンとギャップオフセットを用いた測定ギャップのタイミング算出を行うのでなく、TimeStamp(絶対時間)に基づく測定ギャップのタイミング算出を行うこととする。
<ユーザ装置UE>
図16に、これまでに説明した動作を実行するユーザ装置UEの構成例を示す。なお、図16は、ユーザ装置UEにおいて本発明の実施の形態に特に関連する機能部のみを示すものであり、少なくともLTE方式に準拠した動作を行うための図示しない機能も有するものである。
図20に、これまでに説明した動作を実行する基地局eNBの構成例を示す。基地局MeNBとSeNBは基本的に同様の構成であるため、図20は、MeNBとSeNBのいずれにも適用できる構成を示している。なお、ユーザ装置UEとのRRC接続を基地局MeNBのみが行う場合には、RRC信号で測定設定を行う機能を基地局MeNBの測定制御部204のみが備えることとしてもよい。
(第1項)
基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて使用される前記ユーザ装置であって、
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定手段と、
所定の通知トリガを検出した場合に、前記測定手段により測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知手段と
を備えることを特徴とするユーザ装置。
(第2項)
前記所定の通知トリガは、前記ユーザ装置が、前記基地局間キャリアアグリゲーションを行うための設定信号を前記第1の基地局又は前記第2の基地局から受信したことである
ことを特徴とする第1項に記載のユーザ装置。
(第3項)
前記所定の通知トリガは、前記ユーザ装置において、在圏セルの受信品質が所定閾値よりも劣化した場合に測定報告を送信するイベントがトリガされたことである
ことを特徴とする第1項に記載のユーザ装置。
(第4項)
前記所定の通知トリガは、前記第1の基地局又は前記第2の基地局から、測定ギャップの設定情報を受信したことである
ことを特徴とする第1項に記載のユーザ装置。
(第5項)
前記第1の基地局又は前記第2の基地局から測定ギャップの設定情報を受信し、当該設定情報に基づいて前記第1の基地局に対する測定ギャップを算出し、当該設定情報と前記時間差情報に基づいて前記第2の基地局に対する測定ギャップを算出し、算出された各測定ギャップについて、当該測定ギャップの前後所定期間も測定ギャップと見なす測定制御手段
を備えることを特徴とする第1項ないし第4項のうちいずれか1項に記載のユーザ装置。
(第6項)
前記第1の基地局又は前記第2の基地局から測定ギャップの設定情報を受信し、当該設定情報に基づいて前記第1の基地局に対する測定ギャップを算出し、当該測定ギャップの絶対時間を取得し、当該絶対時間に基づいて、前記第2の基地局に対する測定ギャップを算出する測定制御手段
を備えることを特徴とする第1項ないし第4項のうちいずれか1項に記載のユーザ装置。
(第7項)
前記時間差情報は、前記第1の基地局に対する測定ギャップから前記時間差を補正して得られる測定ギャップを前記第2の基地局において算出するために使用される設定情報である
ことを特徴とする第1項ないし第4項のうちいずれか1項に記載のユーザ装置。
(第8項)
基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて前記第2の基地局として使用される基地局であって、
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置、又は、前記第1の基地局から、測定ギャップの設定情報を受信し、当該設定情報と前記時間差情報に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出し、当該測定ギャップの前後所定期間も測定ギャップと見なす測定制御手段と
を備えることを特徴とする基地局。
(第9項)
基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて前記第2の基地局として使用される基地局であって、
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置における前記第1の基地局に対する測定ギャップの絶対時間を、当該測定ギャップの設定情報と前記受信手段により受信した前記時間差情報とに基づき算出し、当該絶対時間に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出する測定制御手段と
を備えることを特徴とする基地局。
(第10項)
基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて使用される前記ユーザ装置が実行する時間差情報通知方法であって、
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定ステップと、
所定の通知トリガを検出した場合に、前記測定ステップにより測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知ステップと
を備えることを特徴とする時間差情報通知方法。
MeNB、SeNB 基地局
101 DL信号受信部
102 UL信号送信部
103 DC/CA管理部
104 測定制御部
105 ずれ測定部
106 ずれ情報通知部
201 DL信号送信部
202 UL信号受信部
203 DC/CA管理部
204 測定制御部
205 スケジューリング部
206 ずれ情報取得部
207 基地局間通信部
Claims (9)
- 基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて使用される前記ユーザ装置であって、
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定手段と、
所定の通知トリガを検出した場合に、前記測定手段により測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知手段と
を備えることを特徴とするユーザ装置。 - 前記所定の通知トリガは、前記ユーザ装置が、前記基地局間キャリアアグリゲーションを行うための設定信号を前記第1の基地局又は前記第2の基地局から受信したことである
ことを特徴とする請求項1に記載のユーザ装置。 - 前記所定の通知トリガは、前記ユーザ装置において、在圏セルの受信品質が所定閾値よりも劣化した場合に測定報告を送信するイベントがトリガされたことである
ことを特徴とする請求項1に記載のユーザ装置。 - 前記所定の通知トリガは、前記第1の基地局又は前記第2の基地局から、測定ギャップの設定情報を受信したことである
ことを特徴とする請求項1に記載のユーザ装置。 - 基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて使用される前記ユーザ装置であって、
前記第1の基地局又は前記第2の基地局から測定ギャップの設定情報を受信する受信手段と、
前記設定情報に基づいて前記第1の基地局に対する測定ギャップを設定するとともに、前記第1の基地局に対する測定ギャップとなるサブフレームと重なるサブフレームを前記第2の基地局に対する測定ギャップとして設定する測定制御手段と
を備えることを特徴とするユーザ装置。 - 前記測定制御手段は、前記設定情報に基づいて前記第1の基地局に対する測定ギャップを算出し、当該測定ギャップの絶対時間を取得し、当該絶対時間に基づいて、前記第2の基地局に対する測定ギャップを算出する
ことを特徴とする請求項5に記載のユーザ装置。 - 基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて前記第2の基地局として使用される基地局であって、
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置、又は、前記第1の基地局から、測定ギャップの設定情報を受信し、当該設定情報と前記時間差情報に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出し、当該測定ギャップの前後所定期間も測定ギャップと見なす測定制御手段と
を備えることを特徴とする基地局。 - 基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて前記第2の基地局として使用される基地局であって、
前記ユーザ装置、又は、前記第1の基地局から、前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差に関する時間差情報を受信する受信手段と、
前記ユーザ装置における前記第1の基地局に対する測定ギャップの絶対時間を、当該測定ギャップの設定情報と前記受信手段により受信した前記時間差情報とに基づき算出し、当該絶対時間に基づいて、前記ユーザ装置における前記基地局に対する測定ギャップを算出する測定制御手段と
を備えることを特徴とする基地局。 - 基地局間キャリアアグリゲーションによりユーザ装置と通信を行う第1の基地局及び第2の基地局を含む移動通信システムにおいて使用される前記ユーザ装置が実行する時間差情報通知方法であって、
前記第1の基地局におけるサブフレームと前記第2の基地局におけるサブフレームとの間の時間差を測定する測定ステップと、
所定の通知トリガを検出した場合に、前記測定ステップにより測定された前記時間差に関する時間差情報を前記第1の基地局又は前記第2の基地局に通知する通知ステップと
を備えることを特徴とする時間差情報通知方法。
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