WO2016157657A1 - ユーザ装置及び基地局 - Google Patents
ユーザ装置及び基地局 Download PDFInfo
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- WO2016157657A1 WO2016157657A1 PCT/JP2015/086069 JP2015086069W WO2016157657A1 WO 2016157657 A1 WO2016157657 A1 WO 2016157657A1 JP 2015086069 W JP2015086069 W JP 2015086069W WO 2016157657 A1 WO2016157657 A1 WO 2016157657A1
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- base station
- subframe
- timing
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- reception timing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
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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
Definitions
- the present invention relates to a user apparatus and a base station.
- the LTE (Long Term Evolution) system employs carrier aggregation (CA: Carrier Aggregation) in which communication is performed using a plurality of carriers simultaneously with a predetermined bandwidth (maximum 20 MHz) as a basic unit.
- CA Carrier Aggregation
- a carrier that is a basic unit in carrier aggregation is called a component carrier (CC).
- PCell Primary Cell
- SCell Secondary Cell
- the SCell is a cell that is added to the PCell and set for the user apparatus.
- the addition and deletion of the SCell is performed by RRC (Radio Resource Control) signaling.
- LTE Rel-10 CA uses multiple CCs under the same base station. Further, in Rel-10 CA, a maximum data rate is realized by widening the band by bundling up to five CCs.
- DC dual connectivity
- DC is a type of CA, also called Inter eNB CA (inter-base station carrier aggregation), and Master-eNB (MeNB) and Secondary-eNB (SeNB) are introduced.
- FIG. 2 shows an example of DC.
- MeNB communicates with a user apparatus by CC # 1
- a cell group composed of cells (one or more) under MeNB is defined as MCG (Master Cell Group), and a cell group composed of cells (one or more) under SeNB is defined as SCG ( Secondary Cell Group).
- UL CC is set in at least one SCell of SCG, and PUCCH (Physical-Uplink-Control-Channel) is set in one of them. This SCell is called PSCell (PrimaryPrimSCell).
- each CC is composed of the same base station, and therefore, the SFN (System Frame Number), subframe number, and transmission timing are synchronized among the CCs.
- each CC is composed of a plurality of base stations (MeNB, SeNB). Therefore, the SFN, the subframe number, and the transmission timing may not be synchronized between the CC belonging to the MCG and the CC belonging to the SCG.
- FIG. 3A illustrates a state in which the SFN, the subframe number, and the transmission timing are synchronized between CC # 1 and CC # 2.
- FIG. 3B illustrates a state in which the SFN, the subframe number, and the transmission timing are not synchronized between CC # 1 and CC # 2.
- DRX Discontinuous Reception
- the user equipment in the RRC connected state only receives a PDCCH (Physical Downlink Control Channel) for a predetermined time (On duration period), and stops the processing of the RF (Radio Frequency) unit at other times. Is allowed to operate.
- PDCCH Physical Downlink Control Channel
- RF Radio Frequency
- DRX control is performed independently for each base station for each user apparatus. That is, when CA by DC is performed, the user apparatus is instructed by each of the base station (MeNB) that configures the MCG and the base station (SeNB) that configures the SCG to start timing of the On duration period and the On duration period.
- MeNB base station
- SeNB base station
- FIG. 4 is a diagram for explaining a problem in DRX control. It is assumed that the user apparatus performs CA that bundles CC # 1 belonging to MCG and CC # 2 belonging to SCG. As shown in FIG. 4, the on-duration period and on-duration period start timing for CC # 1, and the on-duration period and on-duration period start timing for CC # 2 are independent from the base station to the user equipment. Since the instruction is given, the time during which the RF unit of the user apparatus operates increases.
- an RF unit used for a CC belonging to an MCG and an RF unit used for a CC belonging to an SCG are often mounted using a part of common elements. Therefore, stopping both RF units is more effective in reducing the power consumption of the user device than stopping each RF unit independently.
- the user apparatus in order to connect a user apparatus to a cell with higher quality, or to perform load balancing between cells, the user apparatus is made to measure the radio quality of each cell.
- the user apparatus stops DL (Downlink) and UL (Uplink) communication in order to perform frequency switching of the RF unit.
- the time for which the communication is stopped is called a measurement gap.
- the section and timing (specified by Gap Pattern and Gap offset) where the measurement gap is provided are determined by the base station and notified to the user apparatus. Also, the base station allocates radio resources in vain when the user equipment stops communication during the time corresponding to the measurement gap by stopping the scheduling of DL and UL toward the user equipment. I am trying not to.
- the base station sets a section and a timing in which a measurement gap is provided for all CCs at the same timing.
- a base station (MeNB) configuring the MCG sets a section and timing in which a measurement gap is provided.
- FIG. 5 is a diagram for explaining the problems in the measurement gap control. It is assumed that the user apparatus performs CA that bundles CC # 1 belonging to MCG and CC # 2 belonging to SCG. As described above, the user apparatus stops DL and UL communication in order to perform frequency switching of the RF unit while the measurement gap is set. That is, the user apparatus stops communication in CC # 2 in addition to CC # 1 while the measurement gap is set. When the subframes are not synchronized between CC # 1 and CC # 2 as shown in FIG. 5, the user apparatus performs DL in the section indicated by the “communication unavailable section” in the subframe of CC # 2. And UL communication cannot be performed.
- the base station (SeNB) configuring the SCG does not recognize the “communication unavailable section”, the base station (SeNB) performs DL and UL scheduling for the user apparatus in CC # 2. That is, there is a problem that radio resources are allocated uselessly even though the user apparatus cannot communicate.
- the disclosed technique has been made in view of the above, and provides a technique in which a user apparatus detects a shift of each subframe of radio signals transmitted from a plurality of base stations and notifies the base station of the deviation. Objective.
- a user apparatus of the disclosed technology is a user apparatus that communicates with a first base station and a second base station in a communication system that supports carrier aggregation, and the first apparatus receives from the first base station A measurement unit that measures a timing shift between a reception timing of a radio signal and a reception timing of a second radio signal received from the second base station, and the timing shift measured by the measurement unit A transmitter that transmits information indicating the above to the first base station or the second base station.
- the base station of the disclosed technique is a base station that communicates with a user apparatus in a communication system that supports carrier aggregation, and receives a first radio signal transmitted from the base station from the user apparatus.
- a technique in which a user apparatus detects a shift of each subframe of radio signals transmitted from a plurality of base stations and notifies the base station.
- LTE corresponds to not only a communication method corresponding to Release 8 or 9 of 3GPP but also Release 10, 11, 12, 13, or Release 14 or later of 3GPP. It is used in a broad sense that includes communication methods.
- FIG. 6 is a diagram illustrating a configuration of the communication system according to the embodiment.
- the communication system according to the present embodiment is a communication system including a user apparatus 1, a base station (MeNB) 2 a configuring MCG, and a base station (SeNB) 2 b configuring SCG.
- the base station 2a and the base station 2b constitute a CA by DC, and the user apparatus 1 can perform CA communication between the base station 2a and the base station 2b.
- the base station 2a constitutes a cell 3a (PCell), and the base station 2b constitutes a cell 3b (PSCell).
- Each cell (3a, 3b) is composed of, for example, one CC or a set of downlink CC and uplink CC. In the following description, each cell may be considered synonymous with CC.
- the base station 2a and the base station 2b are illustrated so as to constitute the cell 3a and the cell 3b, respectively, but for convenience of illustration, the base station 2a and the base station 2b are respectively Another cell (SCell) may be further configured.
- the base station 2a and the base station 2b may be collectively referred to as the base station 2. Further, the cell 3a and the cell 3b may be collectively referred to as the cell 3.
- the user apparatus 1 has a function of communicating with the base station 2 and the core network through wireless.
- the user device 1 is, for example, a mobile phone, a smartphone, a tablet, a mobile router, or a wearable terminal.
- the user device 1 may be any user device 1 as long as the device has a communication function.
- the user device 1 includes a CPU such as a processor, a memory device such as a ROM, a RAM, or a flash memory, an antenna for communicating with the base station 2, and hardware resources such as an RF (Radio Frequency) device.
- Each function and process of the user device 1 may be realized by a processor processing or executing data or a program stored in the memory device.
- the user apparatus 1 is not limited to the hardware configuration described above, and may have any other appropriate hardware configuration.
- the base station 2 communicates with the user device 1 through wireless communication.
- the base station 2 includes a CPU such as a processor, a memory device such as a ROM, a RAM, or a flash memory, an antenna for communicating with the user device 1 and the like, a communication interface device for communicating with the adjacent base station 2 and the core network, and the like. It consists of hardware resources. Each function and process of the base station 2 may be realized by a processor processing or executing data or a program stored in a memory device. However, the base station 2 is not limited to the hardware configuration described above, and may have any other appropriate hardware configuration.
- the user apparatus 1 measures the subframe shift of the radio signal received from each of the base station 2a and the base station 2b, and determines the measured subframe shift to the base station 2a and / or The base station 2b is notified. Further, the base station 2a and the base station 2b perform scheduling control in consideration of DRX control and measurement gap based on the subframe shift notified from the user apparatus 1.
- FIG. 7 is a diagram illustrating an example of a functional configuration of the user apparatus according to the embodiment.
- the user device 1 includes a signal reception unit 11, a signal transmission unit 12, a reception timing measurement unit 13, and a report unit 14.
- FIG. 7 shows only functional units that are particularly related to the embodiment of the present invention in the user apparatus 1, and has at least a function (not shown) for performing an operation based on LTE.
- the functional configuration shown in FIG. 7 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.
- the signal receiving unit 11 includes a function of wirelessly receiving various signals from the base station 2 and acquiring higher layer signals from the received physical layer signals.
- the signal transmission unit 12 includes a function of generating various physical layer signals from the upper layer signal to be transmitted from the user apparatus 1 and wirelessly transmitting the signals.
- each of the signal receiving unit 11 and the signal transmitting unit 12 includes a function of executing CA for bundling a plurality of CCs for communication.
- Each of the signal reception unit 11 and the signal transmission unit 12 includes a packet buffer, and is assumed to perform layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing. However, it is not limited to this.
- the signal receiving unit 11 includes the base station 2a and the base station 2b based on a synchronization signal (PSS, SSS) transmitted from the base station 2a, an MIB (Master Information Block) included in the PBCH (Physical Broadcast Channel), and the like.
- PSS synchronization signal
- SSS synchronization signal
- MIB Master Information Block
- Receiving timing symbol timing
- SFN subframe number of each radio signal transmitted from.
- the reception timing measurement unit 13 includes a reception timing (symbol timing) of a radio signal transmitted from the base station 2a, an SFN and a subframe number, a reception timing (symbol timing) of a radio signal transmitted from the base station 2b, an SFN and The subframe number is compared, and a shift in reception timing between the radio signal transmitted from the base station 2a and the radio signal transmitted from the base station 2b is measured.
- the reporting unit 14 transmits information indicating a shift in reception timing measured by the reception timing measurement unit 13 (hereinafter referred to as “reception timing information”) via the signal transmission unit 12 to the base station 2a and / or the base station 2b. Send (notify) to.
- FIG. 8 is a diagram illustrating an example of a functional configuration of the base station according to the embodiment.
- the base station 2 includes a signal reception unit 21, a signal transmission unit 22, an inter-base station communication unit 23, a cooperation information exchange unit 24, a storage unit 25, a DRX control unit 26, and a scheduling control unit 27.
- FIG. 8 shows only the functional units particularly related to the embodiment of the present invention in the base station 2, and has at least a function (not shown) for performing an operation based on LTE.
- the functional configuration shown in FIG. 8 is only an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.
- the signal receiving unit 21 includes a function of wirelessly receiving various signals from the user apparatus 1 and acquiring higher layer signals from the received physical layer signals.
- the signal transmission unit 22 includes a function of generating various types of physical layer signals from a higher layer signal to be transmitted from the base station 2 and wirelessly transmitting the signals.
- Each of the signal receiving unit 21 and the signal transmitting unit 22 may include a function of executing CA for performing communication by bundling a plurality of CCs.
- each of the signal receiving unit 21 and the signal transmitting unit 22 includes a packet buffer and performs layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing.
- PHY layer 1
- MAC layer 2
- PDCP PDCP
- the inter-base station communication unit 23 communicates with other base stations. Further, the inter-base station communication unit 23 may include a function of processing a signal transmitted / received via the X2 interface.
- the cooperation information exchanging unit 24 receives the reception timing information from the user device 1 and, based on the reception timing information, information for performing the scheduling control in consideration of DRX control and measurement gap (hereinafter referred to as “cooperation information”). Is exchanged with other base stations. Further, the cooperation information exchanged with other base stations is stored in the storage unit 25.
- the storage unit 25 stores linkage information.
- the cooperation information is different for each user apparatus 1, and includes, for example, information for aligning the duration period between the base stations 2 in the DRX control, information on a section and timing for providing a measurement gap in the MeNB, and the like. It is.
- the DRX control unit 26 instructs the user device 1 of the on duration period and the start time of the on duration period based on the reception timing information and / or the cooperation information stored in the storage unit 25.
- the scheduling control unit 27 performs scheduling so that DL and UL radio resources are not allocated to the subframe corresponding to the measurement gap section based on the reception timing information or / and the cooperation information stored in the storage unit 25. Do.
- the functional configurations of the user apparatus 1 and the base station 2 described above may be realized entirely by hardware circuits (for example, one or a plurality of IC chips), or may be partially configured by hardware circuits. This part may be realized by a CPU and a program.
- FIG. 9 is a diagram illustrating a hardware configuration example of the user apparatus according to the embodiment.
- FIG. 9 shows a configuration closer to the mounting example than FIG.
- the user apparatus 1 performs processing such as an RE (Radio Equipment) module 101 that performs processing related to a radio signal, a BB (Base Band) processing module 102 that performs baseband signal processing, and a higher layer. It has a device control module 103 and a SIM slot 104 which is an interface for accessing a SIM card.
- RE Radio Equipment
- BB Base Band
- the RE module 101 should transmit the digital baseband signal received from the BB processing module 102 from the antenna by performing D / A (Digital-to-Analog) conversion, modulation, frequency conversion, power amplification, and the like. Generate a radio signal. In addition, a digital baseband signal is generated by performing frequency conversion, A / D (Analog-to-Digital) conversion, demodulation, and the like on the received radio signal, and is passed to the BB processing module 102.
- the RE module 101 includes, for example, a part of the signal reception unit 11 and a part of the signal transmission unit 12 illustrated in FIG.
- the BB processing module 102 performs processing for mutually converting IP packets and digital baseband signals.
- a DSP (Digital Signal Processor) 112 is a processor that performs signal processing in the BB processing module 102.
- the memory 122 is used as a work area for the DSP 112.
- the BB processing module 102 includes, for example, a part of the signal reception unit 11, a part of the signal transmission unit 12, and the reception timing measurement unit 13 illustrated in FIG. 7.
- the device control module 103 performs IP layer protocol processing, various application processing, and the like.
- the processor 113 is a processor that performs processing performed by the device control module 103.
- the memory 123 is used as a work area for the processor 113.
- the processor 113 reads and writes data from and to the SIM via the SIM slot 104.
- the device control module 103 includes, for example, a report unit 14 illustrated in FIG.
- FIG. 10 is a diagram illustrating a hardware configuration example of the base station according to the embodiment.
- FIG. 10 shows a configuration closer to the mounting example than FIG.
- the base station 2 includes an RE module 201 that performs processing related to a radio signal, a BB processing module 202 that performs baseband signal processing, a device control module 203 that performs processing such as an upper layer, a network, And a communication IF 204 which is an interface for connection.
- the RE module 201 generates a radio signal to be transmitted from the antenna by performing D / A conversion, modulation, frequency conversion, power amplification, and the like on the digital baseband signal received from the BB processing module 202.
- a digital baseband signal is generated by performing frequency conversion, A / D conversion, demodulation, and the like on the received radio signal and passed to the BB processing module 202.
- the RE module 401 includes, for example, a part of the signal reception unit 21 and a part of the signal transmission unit 22 illustrated in FIG.
- the BB processing module 202 performs processing for mutually converting an IP packet and a digital baseband signal.
- the DSP 212 is a processor that performs signal processing in the BB processing module 202.
- the memory 222 is used as a work area for the DSP 212.
- the BB processing module 202 includes, for example, a part of the signal reception unit 21 and a part of the signal transmission unit 22 illustrated in FIG. 8, a storage unit 25, a DRX control unit 26, and a scheduling control unit 27.
- the device control module 203 performs IP layer protocol processing, OAM (Operation and Maintenance) processing, and the like.
- the processor 213 is a processor that performs processing performed by the device control module 203.
- the memory 223 is used as a work area for the processor 213.
- the auxiliary storage device 233 is, for example, an HDD or the like, and stores various setting information for operating the base station 2 itself.
- the device control module 203 includes, for example, the cooperation information exchange unit 24 shown in FIG.
- the communication IF 204 includes, for example, the inter-base station communication unit 23 illustrated in FIG.
- FIG. 11 is a sequence diagram illustrating an example of a processing procedure of the communication system according to the embodiment.
- the user apparatus 1 measures a shift in reception timing of radio signals transmitted from the base station 2a and the base station 2b, and information indicating the measurement result (reception timing information) is stored in the base station 2a and / or the base station.
- a processing procedure to be transmitted to the station 2b will be described. It is assumed that the user apparatus 1 performs CA between the cell 3a formed by the base station 2a and the cell 3b formed by the base station 2b.
- processing procedure 1 indicates a processing procedure when the user apparatus 1 transmits reception timing information only to a predetermined base station 2a
- processing procedure 2 indicates that the user apparatus 1 receives the reception timing.
- the process procedure in the case of transmitting information to all the base stations 2 which comprise CA by DC is shown.
- the user apparatus 1 may transmit the reception timing information only to the predetermined base station 2b.
- the signal transmission unit 22 of the base station 2a and the base station 2b transmits a radio signal to the user apparatus 1.
- the radio signal includes a synchronization signal (PSS, SSS), PBCH, and the like.
- the signal reception unit 11 of the user apparatus 1 receives each of the reception timings of the radio signals transmitted from the base station 2a and the base station 2b (based on the synchronization signal transmitted from the base station 2a and the base station 2b, PBCH, etc. Symbol timing), SFN, subframe number, and information for uniquely identifying a cell are recognized.
- step S102 the reception timing measurement unit 13 of the user apparatus 1 receives the reception timing (symbol timing) of the radio signal transmitted from the base station 2a, the SFN and the subframe number, and the reception of the radio signal transmitted from the base station 2b.
- the timing (symbol timing), the SFN, and the subframe number are compared, and a shift in reception timing between the radio signal transmitted from the base station 2a and the radio signal transmitted from the base station 2b is measured.
- the reporting unit 14 of the user apparatus 1 transmits, to the base station 2a, the reception timing information report signal including the reception timing information indicating the reception timing shift measured in step S102 via the signal transmission unit 12.
- the reception timing information report signal may be, for example, an RRC control signal, a MAC signal command, or physical channel control information.
- step S104 the base station 2a exchanges cooperation information with the base station 2b.
- the exchange of cooperation information may be performed using, for example, an X2 interface or an interface used for OAM.
- step S105 and step S107 are the same as step S103 and step S104, respectively, description thereof will be omitted.
- the reporting unit 14 of the user apparatus 1 transmits a reception timing information report signal including reception timing information indicating the reception timing shift measured in step S102 to the base station 2b via the signal transmission unit 12.
- the reception timing information report signal may be, for example, an RRC control signal, a MAC signal command, or physical channel control information.
- 12A and 12B are diagrams for explaining an example (part 1) of a method for measuring a reception timing shift and reception timing information.
- 13A and 13B are diagrams for explaining an on duration section (part 1) in DRX control.
- “a” indicates SFN in CC # 1
- “i” indicates a subframe number in CC # 1. That is, the subframes indicated by “a / i + 1”, “a / i + 2”, and “a / i + 3” indicate three consecutive subframes in CC # 1.
- “b” indicates the SFN in CC # 2
- “n” indicates the subframe number in CC # 2. That is, the subframes indicated by “b / n”, “b / n + 1”, and “b / n + 2” indicate three consecutive subframes in CC # 2.
- “i” indicates a subframe number in CC # 1
- “n” indicates a subframe number in CC # 2.
- the reception timing measurement unit 13 selects any one subframe in CC # 1, and stores the SFN and subframe number of the selected subframe.
- the selected CC # 1 subframe is a subframe that serves as a reference when the reception timing measurement unit 13 measures a shift in reception timing.
- FIGS. 12A and 12B it is assumed that the reception timing measurement unit 13 has selected the subframe “a / i + 2”.
- the reception timing measurement unit 13 determines that the start point is between the start point and the end point of the selected CC # 1 subframe (the subframe “a / i + 2” in the examples of FIGS. 12A and 12B).
- a subframe of a certain CC # 2 is selected, and the SFN and subframe number of that subframe are stored.
- the subframe “b / n + 1” is selected.
- the reception timing measurement unit 13 starts the sub-frame of the selected CC # 1 (the subframe of “a / i + 2” in the examples of FIGS. 12A and 12B) and the sub-frame of the selected CC # 2.
- the time shift “X” from the start point of the frame (“b / n + 1” subframe in the examples of FIGS. 12A and 12B) is measured, and the measured X value is stored.
- the reporting unit 14 uniquely identifies the SFN, subframe number, and CC # 1 of the selected CC # 1 subframe (the subframe “a / i + 2” in the examples of FIGS. 12A and 12B).
- the identifier, the SFN of the selected CC # 2 subframe (the subframe of “b / n + 1” in the examples of FIGS. 12A and 12B), the subframe number, and the identifier uniquely identifying CC # 2 were measured.
- the value of X is stored in the reception timing information and transmitted to the base station 2a or / and the base station 2b (step S103, S105 or S106 in FIG. 11).
- the identifier for uniquely identifying CC # 1 and the identifier for uniquely identifying CC # 2 may be, for example, CellIndex or another identifier. Any identifier may be used as long as the base station 2 can uniquely identify a cell or CC constituting the CA.
- FIG. 12A shows that the time lag (value of X) between the selected CC # 1 subframe and the selected CC # 2 subframe is less than half the subframe interval (0.5 ms).
- FIG. 12B shows an example in which the value of X is longer than half the subframe interval (0.5 ms).
- the base station 2 makes the CC # 1 subframe and CC # 2 subframe reported in the reception timing information more than half (0. It can be determined that they overlap).
- the DRX control unit 26 of the base station 2a reports the CC # 1 reported in the radio frame after a predetermined radio frame period (for example, after the Z period) from the SFN of the reported CC # 1 subframe.
- An On duration section may be set starting from a subframe having a subframe number of.
- the DRX control unit 26 of the base station 2b is reported in a radio frame after a predetermined radio frame period (after a Z period similar to CC # 1) from the SFN of the reported CC # 2 subframe.
- the On duration section may be set starting from the subframe of CC # 2 subframe number (“n + 1”).
- FIG. 13A shows the state when the On duration section is set as described above.
- a subframe indicated by a bold frame indicates a subframe corresponding to the subframe number reported in the reception timing information.
- the base station 2 overlaps the CC # 1 subframe and CC # 2 subframe reported in the reception timing information as shown in FIG. 12B. Can be determined to be less than half of the subframe interval.
- the DRX control unit 26 of the base station 2a reports the CC # 1 reported in the radio frame after a predetermined radio frame period (for example, after the Z period) from the SFN of the reported CC # 1 subframe.
- An On duration section may be set starting from a subframe having a subframe number of.
- the DRX control unit 26 of the base station 2b is reported in a radio frame after a predetermined radio frame period (after a Z period similar to CC # 1) from the SFN of the reported CC # 2 subframe.
- the On duration section may be set starting from the subframe (“n”) immediately before the subframe number (“n + 1”) of CC # 2.
- FIG. 13B shows a state where the On duration section is set as described above.
- a subframe indicated by a bold frame indicates a subframe corresponding to the subframe number reported in the reception timing information.
- the reception timing measurement unit 13 selects the CC # 2 subframe having a start point between the start point and end point of the CC # 1 subframe serving as a reference. For example, the reception timing measurement unit 13 May select the subframe of CC # 2 having an end point between the start point and end point of the reference subframe selected in CC # 1. As another example, for example, the reception timing measurement unit 13 may select a subframe of CC # 2 having the same subframe number as the reference subframe selected in CC # 1. The subframe of CC # 2 having the same SFN and subframe number as the reference subframe selected in CC # 1 may be selected.
- the selection criterion of the CC # 1 subframe and CC # 2 subframe notified by the reception timing information and the time difference “X” indicates the time difference of the user apparatus.
- any processing procedure may be used.
- a specific time for example, in microseconds
- a value discretized by a predetermined number for example, 100 microseconds
- It may be stored, or an index number or the like associated with a predetermined time lag may be stored.
- the reception timing measurement unit 13 may compare the start points of the sub-frames of the selected CC # 1 and CC # 2 with each other or between the end points. May be compared, or midpoints of subframes may be compared with each other. Further, the points of predetermined symbol timing may be compared. The reception timing measurement unit 13 may measure the time difference “X” by any method.
- the reporting unit 14 for example, instead of the SFN and the subframe number of the CC # 2 subframe, the difference from the SFN of the CC # 1 subframe (for example, the CC # 2 SFN to the CC # 1
- the value obtained by subtracting SFN) and the difference between the subframe number of CC # 1 are stored in the reception timing information. It may be.
- the reporting unit 14 for example, instead of the SFN of the subframe of CC # 1 and the subframe number, the difference from the SFN of the subframe of CC # 2 (for example, from the SFN of CC # 1 to CC # 2
- the difference between the subframe number of CC # 2 and the difference (for example, the value obtained by subtracting the subframe number of CC # 2 from the subframe number of CC # 1) is stored in the reception timing information. You may do it.
- the reporting unit 14 does not calculate the difference between each of the SFN and the subframe number, but calculates the difference by subtracting the values obtained by concatenating the SFN and the subframe number, and receives the calculated difference at the reception timing. You may make it store in information.
- the base station 2a and the base station 2b exchange cooperation information based on the reception timing information notified from the user apparatus 1, and perform various controls on the user apparatus 1 based on the exchanged cooperation information. Also good.
- the base station 2a and the base station 2b may perform measurement gap control based on the reception timing information notified from the user apparatus 1 or the exchanged cooperation information by the above processing procedure. For example, when the scheduling control unit 27 of the base station 2a sets subframes “i + 2” to “i + 7” as measurement gap sections in CC # 1 of FIGS. 13A and 13B, the scheduling control unit 27 of the base station 2b Starts from the subframe (“n”) immediately before the reported CC # 2 subframe (“n + 1”), that is, for the subframes “n” to “n + 6”, the DL and UL Scheduling may be performed so that radio resources are not allocated.
- the reception timing deviation is measured by the same processing procedure as the specific example of the processing procedure (part 1).
- the reception timing information includes the time deviation “X”. Do not. Points that are not particularly mentioned in the following description may be the same as the specific (part 1) of the processing procedure.
- the reception timing measurement unit 13 selects any one subframe in CC # 1, and stores the SFN and subframe number of the selected subframe.
- the selected CC # 1 subframe is a subframe that serves as a reference when the reception timing measurement unit 13 measures a shift in reception timing.
- FIGS. 12A and 12B it is assumed that the reception timing measurement unit 13 has selected the subframe “a / i + 2”.
- the reception timing measurement unit 13 determines that the start point is between the start point and the end point of the selected CC # 1 subframe (the subframe “a / i + 2” in the examples of FIGS. 12A and 12B).
- a subframe of a certain CC # 2 is selected, and the SFN and subframe number of that subframe are stored.
- the subframe “b / n + 1” corresponds to this.
- the reporting unit 14 uniquely identifies the SFN, subframe number, and CC # 1 of the selected CC # 1 subframe (the subframe “a / i + 2” in the examples of FIGS. 12A and 12B).
- the identifier and the SFN, the subframe number, and the identifier for uniquely identifying CC # 2 of the selected CC # 2 subframe (subframe “b / n + 1” in the examples of FIGS. 12A and 12B) are received. It is stored in the timing information and transmitted to the base station 2a or / and the base station 2b (step S103, S105 or S106 in FIG. 11).
- the base station 2 determines whether the subframe shift is in the state of FIG. 13A (that is, when there are many sections in which the reported subframes overlap each other). It is not possible to determine the state (that is, when the reported subframes have few overlapping sections). Therefore, for example, the DRX control unit 26 of the base station 2b is reported in a radio frame after a predetermined radio frame period (after a Z period similar to CC # 1) from the SFN of the reported subframe of CC # 2. Alternatively, the On duration section may be set starting from the subframe of the CC # 2 subframe number (“n + 1”). In other words, in either case of FIGS. 13A and 13B, the DRX control unit 26 of the base station 2b may set the subframes “n + 1” to “n + 6” as the On duration section.
- the base station 2a and the base station 2b may perform measurement gap control based on the reception timing information notified from the user apparatus 1 or the exchanged cooperation information by the above processing procedure. For example, when the scheduling control unit 27 of the base station 2a sets subframes “i + 2” to “i + 7” as measurement gap sections in CC # 1 of FIGS. 13A and 13B, the scheduling control unit 27 of the base station 2b Starts from the subframe (“n”) immediately preceding the reported CC # 2 subframe number (“n + 1”), that is, DL and UL for subframes “n” to “n + 6”. Scheduling may be performed so that no radio resource is allocated.
- the reception timing measurement unit 13 selects the CC # 2 subframe having a start point between the start point and end point of the CC # 1 subframe serving as a reference. For example, the reception timing measurement unit 13 May select the subframe of CC # 2 having an end point between the start point and end point of the reference subframe selected in CC # 1.
- the scheduling control unit 27 of the base station 2a sets the subframes “i + 2” to “i + 7” as the measurement gap section in CC # 1 in FIGS. 13A and 13B
- the scheduling control unit 27 of the base station 2b uses the reported CC # 2 subframe number ("n") as a starting point, that is, DL and UL radio resources for subframes "n" to "n + 6". You may make it schedule so that it may not allocate.
- the reception timing measurement unit 13 determines that the user apparatus has a small difference in the context between the CC # 1 and CC # 2 subframe start points (for example, when the difference in the context is equal to or less than a predetermined threshold).
- the first reporting unit 14 may select the CC # 2 subframe having the longest section overlapping with the reference CC # 1 subframe and store the selected subframe in the reception timing information.
- the reception timing measurement unit 13 receives subframes between CGs (for example, PCell and PSCell) defined in, for example, synchronous DC A difference in timing (in other words, a difference in maximum DL reception timing or a difference in maximum UL transmission timing) may be used.
- the reporting unit 14 may notify the base station 2 by including information indicating that the difference in the context is very small in the reception timing information.
- base station 2a and base station 2b can perform measurement gap control by the process procedure similar to the specific example (the 2) of the process procedure mentioned later, for example. it can.
- FIG. 14A and FIG. 14B are diagrams for explaining an example (part 2) of a reception timing shift measuring method and reception timing information.
- FIG. 15A and FIG. 15B are diagrams for explaining an On duration section (part 2) in DRX control. Points that are not particularly mentioned in the following description may be the same as the specific (part 1) of the processing procedure.
- the reception timing measurement unit 13 selects any one subframe in CC # 1, and stores the SFN and subframe number of the selected subframe.
- the selected CC # 1 subframe is a subframe that serves as a reference when the reception timing measurement unit 13 measures a shift in reception timing.
- FIGS. 14A and 14B it is assumed that the reception timing measurement unit 13 has selected the subframe “a / i + 2”.
- the reception timing measurement unit 13 sets a start point between the start point and the end point of the selected CC # 1 subframe (the subframe “a / i + 2” in the examples of FIGS. 14A and 14B).
- a subframe of a certain CC # 2 is selected, and the SFN and subframe number of that subframe are stored.
- the subframe “b / n + 1” corresponds.
- the reception timing measurement unit 13 starts the sub-frame of the selected CC # 1 (the subframe of “a / i + 2” in the examples of FIGS. 14A and 14B), and the selected CC # 2 sub-frame.
- the time difference “X” from the start point of the frame (“b / n + 1” subframe in the examples of FIGS. 14A and 14B) is measured, and the measured X value is stored.
- the reporting unit 14 determines the SFN, subframe number, and subframe number of the selected CC # 1 subframe (the subframe “a / i + 2” in the example of FIG. 14A).
- An identifier that uniquely identifies CC # 1, and an SFN, a subframe number, and CC # 2 of the selected CC # 2 subframe (subframe “b / n + 1” in the example of FIG. 14A) are uniquely identified.
- the identifier is stored in the reception timing information and transmitted to the base station 2a and / or the base station 2b.
- the reporting unit 14 determines the SFN, the subframe number, and the CC of the selected CC # 1 subframe (the subframe “a / i + 2” in the example of FIG. 14B).
- An identifier for uniquely identifying # 1 and the SFN, subframe number, and CC # of the subframe immediately before the subframe of the selected CC # 2 (subframe “b / n” in the example of FIG. 14B) 2 is stored in the reception timing information and transmitted to the base station 2a and / or the base station 2b.
- FIG. 14A shows that the time lag (value of X) between the selected CC # 1 subframe and the selected CC # 2 subframe is less than half the subframe interval (0.5 ms).
- An example of a short case is shown
- FIG. 14B shows an example of a case where the value of X is half (0.5 ms) or more of the subframe interval.
- the base station 2 overlaps at least half (0.5 ms or more) of the CC # 1 subframe and CC # 2 subframe reported in the reception timing information. Judge that it is.
- the DRX control unit 26 of the base station 2a sets the reported CC # 1 subframe number in the radio frame after a predetermined radio frame period (for example, after the Z period) from the SFN of the reported CC # 1 subframe.
- An On duration section may be set starting from a subframe.
- the DRX control unit 26 of the base station 2b is reported in a radio frame after a predetermined radio frame period (after a Z period similar to CC # 1) from the SFN of the reported CC # 2 subframe.
- the On duration section may be set starting from the subframe of the subframe number (“n” or “n + 1”) of CC # 2.
- FIG. 15A and FIG. 15B show the situation when the On duration section is set in this way.
- a subframe indicated by a bold frame indicates a subframe corresponding to the subframe number reported in the reception timing information.
- FIG. 15A shows an example when the value of X is less than 0.5 ms
- FIG. 15B shows an example when the value of X is 0.5 ms or more.
- the specific (No. 2) of the processing procedure described above is different from the specific (No. 1) of the processing procedure so that the time difference “X” is not included in the reception timing information. That is, the specific processing procedure (part 2) can reduce control signals (signaling signals) compared to the specific processing procedure (part 1).
- the reporting unit 14 may, for example, instead of the SFN of the CC # 2 subframe and the subframe number, the difference from the SFN of the CC # 1 subframe (for example, from the CC # 2 SFN to the CC # 1
- the value obtained by subtracting SFN) and the difference between the subframe number of CC # 1 are stored in the reception timing information. It may be.
- the reporting unit 14 for example, instead of the SFN of the subframe of CC # 1 and the subframe number, the difference from the SFN of the subframe of CC # 2 (for example, from the SFN of CC # 1 to CC # 2
- the difference between the subframe number of CC # 2 and the difference (for example, the value obtained by subtracting the subframe number of CC # 2 from the subframe number of CC # 1) is stored in the reception timing information. You may do it.
- the reporting unit 14 does not calculate the difference between each of the SFN and the subframe number, but calculates the difference by subtracting the values obtained by concatenating the SFN and the subframe number, and receives the calculated difference at the reception timing. You may make it store in information.
- the base station 2a and the base station 2b may perform measurement gap control based on the reception timing information notified from the user apparatus 1 or the exchanged cooperation information by the above processing procedure. For example, when the scheduling control unit 27 of the base station 2a sets subframes “i + 2” to “i + 7” as measurement gap sections in CC # 1 of FIGS. 15A and 15B, for example, the scheduling control unit of the base station 2b 27, in CC # 2, for example, eight subframes starting from the subframe immediately preceding the reported subframe of CC # 2, that is, subframes “n” to “n + 7” in FIG. 15A In FIG. 15B, scheduling is performed so that DL and UL radio resources are not allocated for subframes “n ⁇ 1” to “n + 6”.
- 15A includes the subframe “n + 7” of CC # 2, and the subframe “n ⁇ 1” of CC # 2 in FIG. 15B includes the base station 2b from the user apparatus 1. It is not known whether the CC # 2 subframe start point set in the notified reception timing information is before or after the CC # 1 subframe start point (that is, which of FIGS. 15A and 15B). This is because I don't know if
- the base station 2 stores the start point of the CC # 1 subframe and the CC # 2 stored in the reception timing information notified from the user apparatus 1. It is impossible to grasp the context of the start point of the subframe.
- the reporting unit 14 of the user apparatus 1 adds information indicating the front-rear relationship between the start point of the CC # 1 subframe and the start point of the CC # 2 subframe to the reception timing information.
- the information may be, for example, 1-bit information in which the state in FIG. 14A is “0” and the state in FIG. 14B is “1”, or the state in FIG. 14A is “1”. It may be 1-bit information whose state is “0”.
- the reception timing measurement unit 13 of the user apparatus 1 may be configured to fixedly select whether the context is the state of FIG. 14A or the state of FIG. 14B without strictly determining the context.
- the reporting unit 14 may not notify the information indicating the context, and may implicitly indicate to the base station 2 that the difference in the context is very small.
- the base station 2a and the base station 2b may perform measurement gap control based on the reception timing information notified from the user apparatus 1 by the above processing procedure or the exchanged cooperation information. For example, when the scheduling control unit 27 of the base station 2a sets subframes “i + 2” to “i + 7” as measurement gap sections in CC # 1 of FIGS. 15A and 15B, for example, the scheduling control unit of the base station 2b 15A, in the case of FIG. 15A, in CC # 2, the subframe (“n”) immediately before the reported subframe (“n + 1”) of CC # 2 is used as a starting point, that is, “n” to “n + 6”. For the subframe of "", scheduling may be performed so as not to allocate DL and UL radio resources.
- the scheduling control unit 27 of the base station 2b starts from the reported subframe (“n”) of CC # 2 in CC # 2, that is, sub-bands of “n” to “n + 6”. Scheduling may be performed so that DL and UL radio resources are not allocated to frames.
- the scheduling control unit 27 of the base station 2b since the reception timing information includes information indicating the context of the start point of the CC # 1 subframe and the CC # 2 subframe, the scheduling control unit 27 of the base station 2b. Can determine whether the subframe shift is in the state of FIG. 15A or the state of FIG. 15B.
- the reception timing measurement unit 13 of the user apparatus 1 measures a time lag between the CC # 1 subframe and the CC # 2 subframe, but a measurement error may actually occur. For example, when the value of the time difference “X” is close to 0.5 ms, it is assumed that an error occurs in the reception timing information notified to the base station 2.
- FIG. 16 is a diagram for explaining measurement errors in the user apparatus.
- the start point of the CC # 2 subframe is present at the approximate center of the CC # 1 subframe (that is, when the value of X is approximately 0.5 ms)
- the user Even if the apparatus 1 determines that the reception timing shift is in the state of FIG. 12A or 14A, it is assumed that the actual reception timing shift is in the state of FIG. 12B or FIG. 14B. In this case, incorrect reception timing information is notified to the base station 2.
- the reporting unit 14 includes information indicating that there is a possibility of reporting an incorrect state due to a measurement error in the reception timing information. It may be included and transmitted to the base station 2.
- the predetermined threshold value may be stored in the user apparatus 1 in advance, or may be notified from the base station 2 to the user apparatus 1 by broadcast information, system information, or the like.
- the base station 2 can determine that there is a possibility that the reception timing information notified from the user apparatus 1 includes a measurement error when performing DRX control or measurement gap control. It is possible to perform control in consideration of the inclusion of
- a user apparatus in a communication system that supports carrier aggregation, a user apparatus that communicates with a first base station and a second base station, the first base station receiving from the first base station A measurement unit for measuring a timing shift between the reception timing of the radio signal of the second radio signal and the reception timing of the second radio signal received from the second base station, and the timing measured by the measurement unit
- a user apparatus including a transmission unit that transmits information indicating a deviation to the first base station or the second base station.
- the user apparatus 1 provides a technique in which the user apparatus 1 detects a shift of each subframe of radio signals transmitted from the plurality of base stations 2 and notifies the base station.
- the measurement unit determines whether or not the timing shift is included in a predetermined threshold value, and the transmission unit determines that the timing shift is included when the timing shift is included in the predetermined threshold value. May be transmitted to the first base station or the second base station.
- the base station 2 can determine that the reception timing information notified from the user apparatus 1 may include a measurement error, and perform various controls in consideration of the measurement error being included. It becomes possible to do.
- the information indicating the timing deviation includes the system frame number and subframe number of the subframe constituting the first radio signal, and the system frame number and subframe of the subframe constituting the second radio signal. Number may be included.
- the base station 2 can identify a shift in reception timing in units of subframes.
- this makes it possible to perform DRX control or measuremanet gap control in cooperation between the base stations 2 constituting the CA by DC, and reduce the power consumption of the user apparatus 1. It is possible to prevent uselessly allocating radio resources during a period when the user apparatus 1 cannot communicate (measuremanet gap section).
- the information indicating the timing deviation further includes a predetermined measurement timing of a subframe constituting the first radio signal and a predetermined measurement of a subframe constituting the second radio signal.
- Information indicating a time difference from the timing may be included.
- the base station 2 can identify in detail the reception timing shift of the subframe for each CC.
- the power consumption of the user apparatus 1 can be further reduced, and it is possible to prevent useless allocation of radio resources during a period in which the user apparatus 1 cannot communicate.
- the measurement unit compares a predetermined measurement timing of a subframe constituting the first radio signal with a predetermined measurement timing of a subframe constituting the second radio signal.
- the timing deviation may be measured.
- the predetermined measurement timing may be a subframe start timing, a subframe start timing and an intermediate timing, or a subframe end timing.
- the user apparatus 1 can measure the shift of the reception timing of the subframe between the CCs at various measurement timings.
- a base station that communicates with a user apparatus, the reception timing of the first radio signal transmitted from the user apparatus from the base station And receiving means for receiving information indicating a timing shift between the reception timing of the second radio signal transmitted from another base station different from the base station, and based on the information indicating the timing shift
- a base station having control means for controlling the user apparatus is provided.
- the base station 2 provides a technique in which the user apparatus 1 detects a shift in each subframe of radio signals transmitted from the plurality of base stations 2 and notifies the base station.
- control means may instruct scheduling of radio resources for the user apparatus or intermittent reception timing to the user apparatus based on the information indicating the timing deviation.
- DRX control or measuremanet gap control can be performed in cooperation between the base stations 2 constituting the CA by DC, and the power consumption of the user apparatus 1 can be reduced, and the user apparatus It is possible to prevent useless allocation of radio resources during a period in which 1 cannot communicate.
- 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 order of the sequences and flowcharts described in the embodiments may be changed as long as there is no contradiction.
- the user apparatus 1 and the base station 2 have been described using functional block diagrams. However, such an apparatus may be realized by hardware, software, or a combination thereof.
- the software operated by the processor of the user apparatus 1 according to the embodiment of the present invention and the software operated by the processor of the base station 2 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only, respectively. It may be stored in any appropriate storage medium such as a memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or the like.
- the reception timing measurement unit 13 is an example of a measurement unit.
- the report unit 14 and the signal transmission unit 12 are examples of transmission means.
- Reception timing information or cooperation information is an example of information indicating a timing shift.
- the signal receiving unit 21 and the cooperation information exchanging unit 24 are examples of receiving means.
- the DRX control unit 26 or the scheduling control unit 27 is an example of a control unit.
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Abstract
Description
図6は、実施の形態に係る通信システムの構成を示す図である。図6に示すように、本実施の形態における通信システムは、ユーザ装置1とMCGを構成する基地局(MeNB)2aとSCGを構成する基地局(SeNB)2bとを含む通信システムである。基地局2aと基地局2bとは、DCによるCAを構成しており、ユーザ装置1は、基地局2aと基地局2bとの間でCA通信を行うことができる。
(ユーザ装置)
図7は、実施の形態に係るユーザ装置の機能構成の一例を示す図である。図7に示すように、ユーザ装置1は、信号受信部11、信号送信部12、受信タイミング測定部13、及び報告部14を有する。図7は、ユーザ装置1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。また、図7に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。
図8は、実施の形態に係る基地局の機能構成の一例を示す図である。図8に示すように、基地局2は、信号受信部21、信号送信部22、基地局間通信部23、連携情報交換部24、記憶部25、DRX制御部26、及びスケジューリング制御部27を有する。図8は、基地局2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。また、図8に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。
(処理シーケンス)
図11は、実施の形態に係る通信システムの処理手順の一例を示すシーケンス図である。
図11を用いて、基地局2a及び基地局2bから送信される無線信号の受信タイミングのずれをユーザ装置1が測定し、測定結果を示す情報(受信タイミング情報)を基地局2a又は/及び基地局2bに送信する処理手順について説明する。ユーザ装置1は、基地局2aが構成するセル3aと基地局2bが構成するセル3bとの間でCAを行っている前提とする。
続いて、ユーザ装置1がステップS102で行う処理の内容、及び、ステップS103又はステップS106で基地局2に送信する受信タイミング情報の内容について具体的に説明する。更に、図11による処理手順が行われた後、基地局2a及び基地局2bが行うDRX制御の動作を具体的に説明する。なお、以下の説明において、基地局2aがCC#1を構成し、基地局2bがCC#2を構成するものとする。また、以下の説明において、CC#1は、PCellでもよいしSCellでもよい。また、CC#2は、PSCellでもよいしSCellでもよい。
処理手順の具体例(その1の変形例)は、処理手順の具体例(その1)と同様の処理手順により受信タイミングのずれを測定するが、受信タイミング情報に時間のずれ「X」を含めないようにする。以下の説明において特に言及しない点は、処理手順の具体的(その1)と同一でよい。
長いCC#2のサブフレームを選択して受信タイミング情報に格納するようにしてもよい。また、当該前後関係の差を判断する際に用いられる所定の閾値として、受信タイミング測定部13は、例えば、同期DCにおいて規定されている、CG間(例えば、PCell及びPSCell)におけるサブフレームの受信タイミングの差(言い換えると、最大DL受信タイミングの差、又は、最大UL送信タイミングの差)を用いるようにしてもよい。また、報告部14は、当該前後関係の差が非常に小さいことを示す情報を、受信タイミング情報に含めて基地局2に通知するようにしてもよい。
図14A及び図14Bは、受信タイミングのずれの測定方法及び受信タイミング情報の一例(その2)を説明するための図である。図15A及び図15Bは、DRX制御におけるOn duration区間(その2)を説明するための図である。以下の説明において特に言及しない点は、処理手順の具体的(その1)と同一でよい。
前述のとおり、処理手順の具体例(その2)において、基地局2は、ユーザ装置1から通知された受信タイミング情報に格納されている、CC#1のサブフレームの開始地点とCC#2のサブフレームの開始地点との前後関係を把握することができない。
ユーザ装置1の受信タイミング測定部13は、CC#1のサブフレーム及びCC#2のサブフレームの間の時間のずれを測定するが、実際には測定誤差が発生する可能性がある。例えば、時間のずれ「X」の値が0.5msに近い場合、基地局2に通知される受信タイミング情報に誤りが生じることが想定される。
以上、実施の形態によれば、キャリアアグリゲーションをサポートする通信システムにおいて、第一の基地局と第二の基地局と通信を行うユーザ装置であって、前記第一の基地局から受信する第一の無線信号の受信タイミングと、前記第二の基地局から受信する第二の無線信号の受信タイミングとの間のタイミングのずれを測定する測定部と、前記測定部により測定された、前記タイミングのずれを示す情報を前記第一の基地局又は前記第二の基地局に送信する送信部と、を有するユーザ装置が提供される。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べたシーケンス及びフローチャートは、矛盾の無い限り順序を入れ替えてもよい。処理説明の便宜上、ユーザ装置1及び基地局2は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従ってユーザ装置1が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従って基地局2が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
2 基地局
3 セル
11 信号受信部
12 信号送信部
13 受信タイミング測定部
14 報告部
21 信号受信部
22 信号送信部
23 基地局間通信部
24 連携情報交換部
25 記憶部
26 DRX制御部
27 スケジューリング制御部
101 REモジュール
102 BB処理モジュール
103 装置制御モジュール
104 SIMスロット
201 REモジュール
202 BB処理モジュール
203 装置制御モジュール
204 通信IF
Claims (8)
- キャリアアグリゲーションをサポートする通信システムにおいて、第一の基地局と第二の基地局と通信を行うユーザ装置であって、
前記第一の基地局から受信する第一の無線信号の受信タイミングと、前記第二の基地局から受信する第二の無線信号の受信タイミングとの間のタイミングのずれを測定する測定部と、
前記測定部により測定された、前記タイミングのずれを示す情報を前記第一の基地局又は前記第二の基地局に送信する送信部と、
を有するユーザ装置。 - 前記測定部は、前記タイミングのずれが所定の閾値に含まれているか否かを判断し、
前記送信部は、前記タイミングのずれが所定の閾値に含まれている場合、前記タイミングのずれが所定の閾値に含まれていることを示す情報を、前記第一の基地局又は前記第二の基地局に送信する、請求項1に記載のユーザ装置。 - 前記タイミングのずれを示す情報は、前記第一の無線信号を構成するサブフレームのシステムフレーム番号及びサブフレーム番号と、前記第二の無線信号を構成するサブフレームのシステムフレーム番号及びサブフレーム番号とを含む、請求項1又は2に記載のユーザ装置。
- 前記タイミングのずれを示す情報は、更に、前記第一の無線信号を構成するサブフレームの予め定められた測定タイミングと、前記第二の無線信号を構成するサブフレームの予め定められた測定タイミングとの間の時間の差分を示す情報を含む、請求項3に記載のユーザ装置。
- 前記測定部は、前記第一の無線信号を構成するサブフレームの予め定められた測定タイミングと、前記第二の無線信号を構成するサブフレームの予め定められた測定タイミングとを比較することで、前記タイミングのずれを測定する、請求項1乃至4のいずれか一項に記載のユーザ装置。
- 前記予め定められた測定タイミングは、サブフレームの開始タイミング、サブフレームの開始タイミング及び終了タイミングの中間のタイミング、又は、サブフレームの終了タイミングである、請求項5に記載のユーザ装置。
- キャリアアグリゲーションをサポートする通信システムにおいて、ユーザ装置と通信を行う基地局であって、
前記ユーザ装置から、当該基地局から送信される第一の無線信号の受信タイミングと、当該基地局とは異なる他の基地局から送信される第二の無線信号の受信タイミングとの間のタイミングのずれを示す情報を受信する受信手段と、
前記タイミングのずれを示す情報に基づいて、前記ユーザ装置を制御する制御手段と、
を有する基地局。 - 前記制御手段は、前記タイミングのずれを示す情報に基づいて、前記ユーザ装置に対する無線リソースのスケジューリング、又は、前記ユーザ装置に間欠受信タイミングを指示する、請求項7に記載の基地局。
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