WO2014054356A1 - Système de communication sans fil, station de base sans fil, dispositif d'utilisateur et procédé de communication sans fil - Google Patents

Système de communication sans fil, station de base sans fil, dispositif d'utilisateur et procédé de communication sans fil Download PDF

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Publication number
WO2014054356A1
WO2014054356A1 PCT/JP2013/072983 JP2013072983W WO2014054356A1 WO 2014054356 A1 WO2014054356 A1 WO 2014054356A1 JP 2013072983 W JP2013072983 W JP 2013072983W WO 2014054356 A1 WO2014054356 A1 WO 2014054356A1
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Prior art keywords
base station
measurement
instruction
candidate
subcell
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PCT/JP2013/072983
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English (en)
Japanese (ja)
Inventor
優輔 佐々木
聖悟 原野
河辺　泰宏
匠吾 矢葺
優 大▲高▼
健吾 柳生
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株式会社エヌ・ティ・ティ・ドコモ
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Publication of WO2014054356A1 publication Critical patent/WO2014054356A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a radio communication system, a radio base station, a user apparatus, and a radio communication method.
  • Carrier aggregation is a communication technique in which a plurality of different frequency bands (component carriers) are combined at the same time in order to improve the transmission rate.
  • a UE user equipment, User Equipment, mobile station
  • FIG. 1 is a schematic diagram showing an outline of carrier aggregation.
  • UE1 can use a plurality of frequency bands in conformity with carrier aggregation.
  • UE2 is not compatible with carrier aggregation and can use only one frequency band.
  • 1.5 GHz band and 2 GHz band are shown, this is for illustrative purposes and the frequency band is not limited. Since UE1 can use a plurality of frequency bands, higher-speed communication is possible than UE2 that can use only a single frequency band.
  • UE1 In order to realize carrier aggregation, it is necessary to prepare a radio base station so that a plurality of frequency bands can be used. In an area where a plurality of frequency bands can be used in conformity with carrier aggregation in the service area, UE1 that conforms to carrier aggregation can use a plurality of frequency bands. In the service area, UE1 can use only a single frequency band in an area that does not conform to carrier aggregation and can use only a single frequency band.
  • component carriers are classified into one main component carrier (PCC) and at least one sub component carrier (SCC).
  • the main component carrier is used for providing NAS (Non-Access Stratum) mobility information, for example, Tracking (Area) identity (TAI), or for providing a security input when the UE originates or performs handover.
  • the sub component carrier is a component carrier that can be used by the UE in addition to the main component carrier. More precisely, there are an uplink main component carrier and a downlink main component carrier, and there are an uplink sub component carrier and a downlink sub component carrier.
  • the serving cell in which the UE communicates using the uplink and downlink main component carriers is called a primary cell (Primary Cell, PCell), and the serving cell in which the UE communicates using the uplink and downlink subcomponent carriers is defined as the sub cell ( Secondary Cell, SCell).
  • PCell Primary Cell
  • SCell Secondary Cell
  • the UE can use a maximum of 5 subcells.
  • a cell is not a cell area described later, but a base station device that provides a communication function for the cell area.
  • FIG. 2 is a schematic diagram showing an example of a mode of use of carrier aggregation.
  • UE1 that matches carrier aggregation moves from left to right in the figure.
  • the radio base station 10 uses two frequency bands A and B for both downlink and uplink.
  • the radio base station 10 has cell areas 10A and 10B, which are ranges where radio waves can reach.
  • the cell area 10A corresponds to the frequency band A
  • the cell area 10B corresponds to the frequency band B.
  • the size of the cell areas 10A and 10B is different because radio waves with a low frequency A reach a longer distance than radio waves with a high frequency B.
  • UE1 transmits in the cell area 10A on the left side of FIG. 2 (outside the cell area 10B).
  • the “Radio” Resource “Control” (RRC) “Setup” procedure is executed, and communication starts in frequency band A.
  • SCC is added, that is, SCell is added.
  • Frequency band B is added as a SCC to a frequency that can be used by UE1.
  • UE1 can communicate not only frequency band A (PCC) but frequency band B as SCC with both downlink (DL) and uplink (UL).
  • PCC frequency band A
  • DL downlink
  • UL uplink
  • whether UE1 uses SCC depends on the usage status of UE1.
  • Whether the SCell should be added is determined by the radio base station 10 based on a report (Measurement Report) of the reception quality of the component carrier measured by the UE to the radio base station.
  • the radio base station 10 transmits an RRC Connection Reconfiguration message to the UE.
  • the UE that has received the RRC Connection Reconfiguration message adds the SCell specified in the message (see Non-Patent Document 2, Sec. 5.3.10.3b, etc.).
  • the determination of whether to add a SCell is based on the hardware resources of the radio base station, the usage status of each frequency band, and the operation criteria for adding a cell in a preset carrier aggregation. May be based.
  • whether or not SCells need to be added may be determined based on a combination of these and the reception quality.
  • the SCC is deleted, that is, the SCell is deleted.
  • Frequency band B is deleted from the SCC usable by UE1.
  • UE1 communicates only with the frequency band A (PCC) with both a downlink (DL) and an uplink (UL).
  • Whether or not the SCell should be deleted is determined by the radio base station 10 based on a report (Measurement Report) of the reception quality of the component carrier measured by the UE to the radio base station.
  • the radio base station 10 transmits an RRC Connection Reconfiguration message to the UE.
  • the UE that has received the RRC Connection Reconfiguration message deletes the SCell specified in the message (see Non-Patent Document 2, Sec. 5.3.10.3a, etc.).
  • the handover is executed, the PCell is switched, and the PCC is switched.
  • FIG. 3 is a schematic view showing another example of a mode of use of carrier aggregation. As indicated by an arrow in FIG. 3, UE1 that matches carrier aggregation moves from left to right in the figure. In FIG. 3, for PCC and SCC, illustration of distinction between downlink and uplink is omitted.
  • the radio base station includes a macro base station 20 and a plurality of pico base stations (small base stations) 30, 31, 32, 33.
  • the macro base station 20 uses the frequency band A for communication and has a cell area (macro cell area) 20A.
  • the pico base stations 30, 31, and 32 use the frequency band B for communication, and have cell areas (pico cell areas) 30B, 31B, and 32B, respectively.
  • the pico base station 33 uses the frequency band C for communication and has a cell area (pico cell area) 33C. Since the pico base station uses lower transmission power than the macro base station, the pico cell area is smaller than the macro cell area of the macro base station.
  • the UE1 transmits in the macro cell area 20A on the left side of FIG. 3 (outside the pico cell area).
  • the RRC Setup procedure is executed so that communication is performed using the frequency band A of the macro cell area 20A as PCC, and communication starts in the frequency band A.
  • SCC is added, that is, SCell is added.
  • the frequency band B of the picocell area 32B is added to the frequency that can be used by the UE1 as the SCC.
  • UE1 can communicate not only frequency band A (PCC) but frequency band B as SCC.
  • whether UE1 uses SCC depends on the usage status of UE1.
  • Whether to add a SCell is determined by the macro base station 20 based on a report to the macro base station 20 of the reception quality of the component carrier measured by the UE.
  • the macro base station 20 transmits an RRC Connection Reconfiguration message to the UE.
  • the UE that has received the RRC Connection Reconfiguration message adds the SCell specified in the message.
  • SCC addition that is, SCell addition is performed.
  • the frequency band C of the picocell area 33C is added to the frequency that can be used by the UE1 as the SCC.
  • UE1 can further communicate as frequency band C as SCC.
  • whether UE1 uses SCC depends on the usage status of UE1.
  • UE1 If UE1 reaches the overlapping portion of picocell area 32B and picocell area 33C from within macrocell area 20A (outside the picocell area), two SCCs (frequency bands A and B) are added at the same time, that is, SCell (picocell) Areas 32B and 33C) are added.
  • SCCs frequency bands A and B
  • the connection with the pico base station that communicates with the addition of SCell is cut off due to a sudden change in the propagation environment, the connection with the PCell (macro cell), that is, the macro base station is maintained. And whether UE1 should reconnect with a pico base station (whether SCell should be added) is based on the report to the macro base station of the reception quality of the component carrier measured by UE in macro base station. To be judged.
  • the SCC is deleted, that is, the SCell is deleted.
  • Frequency band B is deleted from the SCC usable by UE1.
  • UE1 communicates only in the frequency band A (PCC) and the frequency band C (SCC).
  • Whether or not to delete the SCell is determined by the macro base station 20 based on a report to the macro base station 20 of the reception quality of the component carrier measured by the UE.
  • the macro base station 20 transmits an RRC Connection Reconfiguration message to the UE.
  • the UE that has received the RRC Connection Reconfiguration message deletes the SCell specified in the message.
  • the SCC is deleted, that is, the SCell is deleted.
  • Frequency band C is deleted from the SCC that can be used by UE1. Thereby, UE1 communicates only in the frequency band A (PCC).
  • the UE 1 moves from the macro cell area 20A to the macro cell area of another radio base station with the movement, handover is executed, the PCell is switched, and the PCC is switched.
  • UE1 performs reconnection.
  • SCell modification is performed for UE1 that moves back and forth between those picocell areas. In this case, since the SCC is in the same frequency band, the SCC is not corrected.
  • FIG. 4 is a sequence diagram showing a conventional control procedure required for adding a subcell (SCell) of carrier aggregation.
  • SCell subcell
  • the UE and the eNB radio base station
  • the eNB execute a control procedure for transmission for the call. Thereafter, the eNB transmits an RRC Connection Reconfiguration message to the UE.
  • Reconfiguration message is a measurement instruction
  • this RRC Connection Reconfiguration message instructs activation of a measurement gap (Measurement Gap) in which the UE measures reception quality of a frequency band (carrier) of a subcell candidate for the UE. Further, this RRC Connection Reconfiguration message specifies the frequency band (carrier) of the sub cell candidate for the UE, and instructs the UE to measure the reception quality of the frequency band.
  • the measurement gap is a time interval that appears periodically, and is a time interval for measuring reception quality in a frequency band of a cell to which the UE is not currently communicating. There may be one subcell candidate, but there may be a plurality of subcell candidates.
  • the UE When receiving the RRC Connection Reconfiguration message which is this measurement instruction, the UE activates the measurement gap as instructed by the RRC Connection Reconfiguration message. That is, the UE sets the UE itself so that the UE can measure the reception quality related to the cell with which the UE is not currently communicating at periodic time intervals. Then, the UE sets the UE itself so that the UE can measure the reception quality in the frequency band of the subcell candidate specified in the RRC ⁇ ⁇ ⁇ ⁇ Connection ⁇ ⁇ ⁇ ⁇ Reconfiguration message. After completion of these settings, the UE transmits an RRC Connection Reconfiguration Complete message indicating that these settings of the UE have been completed to the eNB.
  • the UE periodically and repeatedly measures the reception quality of the sub-cell candidate frequency band, and repeatedly transmits a report (Measurement Report) indicating the measurement result to the eNB.
  • the eNB determines whether or not to add a secondary cell for the UE that has transmitted the Measurement-Report.
  • a subcell candidate with good communication quality should be added as a subcell, but a subcell candidate with poor communication quality should not be added as a subcell.
  • eNB When eNB judges that a subcell should not be added (for example, judgment after the first Measurement Report of FIG. 4), eNB does not transmit a message to UE. On the other hand, when eNB judges that a subcell should be added (for example, judgment after 2nd and 3rd Measurement-Report in FIG. 4), eNB transmits RRC-Connection Reconfiguration message to UE. To do.
  • This RRC Connection Reconfiguration message is an instruction to add a subcell that specifies the frequency band of the subcell to be added.
  • the UE When receiving the RRC Connection Reconfiguration message, which is an instruction to add this subcell, the UE adds the subcell as indicated in the RRC Connection Reconfiguration message (that is, the frequency at which the SCC corresponding to the subcell can be used). To add). After completion of the addition of the sub cell, the UE transmits an RRC Connection Reconfiguration Complete message indicating that the addition of the sub cell is completed to the eNB.
  • the eNB may instruct the UE to change the frequency band of the subcell candidate for which the UE should measure the reception quality based on the Measurement Report. This is because the sub cell to be used or added by the UE may change according to the change in the UE position.
  • the eNB includes the instruction indicating the frequency band of the new subcell candidate in the RRCRRConnection Reconfiguration message that is an instruction to add the subcell. There may be one frequency band for a new subcell candidate, but there may be a plurality of frequency bands.
  • the UE can use a maximum of 5 subcells. Therefore, even after the addition of the subcell, the UE continues to measure the reception quality in the frequency band of the subcell candidate. That is, the UE continues to activate the measurement gap and periodically repeats measurement of reception quality in the frequency band of the subcell candidate. As described above, the UE repeats the measurement of the reception quality in the frequency band of the subcell candidate over a long period of time, so that the throughput of the UE decreases and the power consumption of the UE increases.
  • the present invention provides a radio communication system, a radio base station, a user apparatus, and a radio communication method that can improve the throughput of the user apparatus and reduce the power consumption.
  • a radio communication system includes a radio base station and a user apparatus that performs radio communication with the radio base station, and the radio base station communicates radio between the user apparatus and the radio base station.
  • a measurement instructing unit for transmitting, to the user apparatus, a measurement instruction of reception quality in a frequency band of a sub-cell candidate managed by the radio base station that can be a sub-cell for the user apparatus; Based on the report reception unit that repeatedly receives a report on the measurement result of the reception quality of the frequency band of the subcell candidate from the user apparatus and the report received by the report reception unit, the subcell addition is added to the user apparatus.
  • a subcell addition instructing section for transmitting an instruction, and a measurement for instructing the user equipment to stop measuring the reception quality of the frequency band of the subcell candidate when a certain time has elapsed since the transmission of the measurement instruction.
  • a measurement stop instruction unit that transmits a stop instruction, wherein the user apparatus receives the measurement instruction from the radio base station, and the measurement instruction receiving unit receives the measurement instruction,
  • a reception quality measurement unit that repeatedly measures the reception quality of the frequency band of the cell candidate, a report transmission unit that repeatedly transmits a report on the measurement result of the reception quality of the frequency band of the subcell candidate to the radio base station, and the radio
  • a measurement stop instruction receiving unit that receives the measurement stop instruction from a base station, and when the measurement stop instruction receiving unit receives the measurement stop instruction, the reception quality measurement unit receives the reception quality of the frequency band of the subcell candidate Stop measuring.
  • a radio base station is a radio base station that performs radio communication with a user apparatus, and when the radio communication with the user apparatus starts, A measurement instruction unit that transmits a measurement instruction of reception quality of a frequency band of a subcell candidate managed by the radio base station that can be a cell, and a measurement result of reception quality of the frequency band of the subcell candidate from the user apparatus From a report receiving unit that repeatedly receives a report, a sub cell addition instructing unit that transmits an instruction to add a sub cell to the user apparatus based on the report received by the report receiving unit, and transmission of the measurement instruction A measurement stop instructing unit that transmits a measurement stop instruction to instruct the user apparatus to stop measurement of reception quality in the frequency band of the subcell candidate when a certain time has elapsed;
  • a user apparatus is a user apparatus that performs radio communication with a radio base station, and at the start of radio communication with the radio base station, from the radio base station to the user apparatus
  • a measurement instruction receiving unit that receives a measurement instruction of reception quality of a frequency band of a subcell candidate managed by the radio base station that can be a subcell; and when the measurement instruction receiving unit receives the measurement instruction, the subcell A reception quality measurement unit that repeatedly measures reception quality of a candidate frequency band, a report transmission unit that repeatedly transmits a report on a measurement result of reception quality of the frequency band of the sub cell candidate to the radio base station, and the sub cell
  • a measurement stop instruction receiving unit for receiving from the radio base station the measurement stop instruction for instructing stop of measurement of reception quality of a candidate frequency band, and the measurement stop instruction receiving unit is configured to stop the measurement.
  • the reception quality measurement unit stops measuring the reception quality of the frequency band of the sub-cell candidate.
  • a radio communication method is a radio communication method executed by a radio base station and a user apparatus that performs radio communication with the radio base station.
  • the user device is instructed to measure the reception quality of the frequency band of the sub cell candidate managed by the wireless base station that can be a sub cell for the user device.
  • a measurement stop instruction for instructing the user apparatus to stop the measurement of the reception quality of the frequency band of the subcell candidate is transmitted.
  • a radio communication system includes a radio base station and a user apparatus that performs radio communication with the radio base station, and the radio base station communicates radio between the user apparatus and the radio base station.
  • a subcell candidate determination unit that determines whether or not there is a subcell candidate managed by the radio base station that can be a subcell for the user apparatus at the start of communication; When the sub cell candidate determination unit determines that the sub cell candidate determination unit transmits an instruction to measure the reception quality of the frequency band of the sub cell candidate to the user apparatus, and the sub cell candidate determination unit determines that there is no sub cell candidate.
  • a measurement instruction unit that does not transmit the measurement instruction, a report reception unit that repeatedly receives a report on the measurement result of the reception quality of the frequency band of the subcell candidate from the user apparatus that has received the measurement instruction, and A sub cell addition instruction unit that transmits an instruction to add a sub cell to the user apparatus based on a report received by a notification receiving unit, and the user apparatus receives the measurement instruction from the radio base station
  • a reception quality measuring unit that repeatedly measures the reception quality of the frequency band of the subcell candidate, and the reception quality of the frequency band of the subcell candidate
  • a report transmission unit that repeatedly transmits a report on the measurement result to the radio base station.
  • a radio base station is a radio base station that performs radio communication with a user apparatus, and the radio base station that can be a sub cell for the user apparatus when radio communication with the user apparatus starts.
  • the subcell candidate determination unit determines whether there is a subcell candidate managed by a base station and the subcell candidate determination unit determines that there is the subcell candidate, the frequency of the subcell candidate
  • a measurement instruction unit that does not transmit the measurement instruction; and Based on the report received from the user apparatus that has received the measurement result of the reception quality of the frequency band of the sub cell candidate, the report receiving unit that repeatedly receives the report received by the report receiving unit, And a secondary cell addition instructing unit for transmitting Le additional instructions.
  • a radio communication method is a radio communication method executed by a radio base station and a user apparatus that performs radio communication with the radio base station, in the radio base station, the user Determining whether or not there is a subcell candidate managed by the radio base station that can be a subcell for the user apparatus when starting wireless communication between the apparatus and the radio base station; When it is determined that there is a candidate, the measurement instruction of the reception quality of the frequency band of the sub cell candidate is transmitted to the user apparatus, and when it is determined that there is no sub cell candidate, the measurement instruction is transmitted.
  • the user apparatus Repetitively receiving a report regarding the measurement result of the reception quality of the frequency band of the subcell candidate from the user apparatus that has received the measurement instruction, and based on the received report, the user apparatus Transmitting an instruction to add a subcell, and receiving the measurement instruction from the radio base station at the user apparatus, and receiving the frequency band of the subcell candidate when receiving the measurement instruction. Repeatedly measuring quality, and repeatedly transmitting a report on a measurement result of reception quality in the frequency band of the subcell candidate to the radio base station.
  • a radio communication system includes a radio base station and a user apparatus that performs radio communication with the radio base station, wherein the radio base station is a radio between the user apparatus and the radio base station.
  • a communication type determination unit that determines whether the wireless communication is for a voice call at the start of communication, and a communication type determination unit that determines that the wireless communication is not for a voice call;
  • An instruction to measure reception quality in a frequency band of a sub cell candidate managed by the radio base station that can be a sub cell for the user apparatus is transmitted to the user apparatus, and the radio communication is for a voice call.
  • the measurement instruction unit does not transmit the measurement instruction, and the reception quality measurement result of the frequency band of the subcell candidate from the user apparatus that has received the measurement instruction.
  • a report receiving unit that repeatedly receives a report, and a sub cell addition instructing unit that transmits an instruction to add a sub cell to the user apparatus based on the report received by the report receiving unit.
  • a measurement instruction receiving unit that receives the measurement instruction from the radio base station, and a reception quality measuring unit that repeatedly measures the reception quality of the frequency band of the subcell candidate when the measurement instruction receiving unit receives the measurement instruction.
  • a report transmission unit that repeatedly transmits a report on the measurement result of the reception quality of the frequency band of the subcell candidate to the radio base station.
  • a radio base station is a radio base station that performs radio communication with a user apparatus, and whether the radio communication is for a voice call at the start of radio communication with the user apparatus.
  • a communication type determination unit that determines whether or not the wireless base station that can be a subcell for the user apparatus is managed by the communication type determination unit when the communication type determination unit determines that the wireless communication is not for voice communication.
  • the measurement instruction is not transmitted.
  • a measurement instruction unit, a report reception unit that repeatedly receives a report on the measurement result of the reception quality of the frequency band of the subcell candidate from the user apparatus that has received the measurement instruction, and the report reception unit. Based on the report that is, in the user equipment, and a secondary cell addition instructing unit for transmitting an indication of the additional sub-cells.
  • a radio communication method is a radio communication method executed by a radio base station and a user apparatus that performs radio communication with the radio base station.
  • determining whether the wireless communication is for a voice call, and determining that the wireless communication is not for a voice call An instruction to measure the reception quality of the frequency band of the sub cell candidate managed by the radio base station that can be a sub cell for the user apparatus is transmitted to the user apparatus, and the radio communication is for a voice call.
  • the measurement instruction is not transmitted, and a report regarding the measurement result of the reception quality of the frequency band of the subcell candidate is repeatedly received from the user apparatus that has received the measurement instruction; Transmitting a sub cell addition instruction to the user apparatus based on the received report, and receiving the measurement instruction from the radio base station at the user apparatus; and the measurement instruction , Repeatedly measuring the reception quality of the frequency band of the subcell candidate, and repeatedly transmitting a report on the measurement result of the reception quality of the frequency band of the subcell candidate to the radio base station.
  • the radio base station transmits a measurement stop instruction for instructing the user apparatus to stop the measurement of the reception quality of the frequency band of the subcell candidate when a certain time has elapsed since the transmission of the measurement instruction. To do.
  • the user equipment stops measuring the reception quality of the frequency band of the subcell candidate. Therefore, the throughput of the user device can be improved and the power consumption can be reduced.
  • the radio base station receives the frequency band of the sub cell candidate when it is determined that there is a sub cell candidate at the start of radio communication between the user apparatus and the radio base station.
  • a quality measurement instruction is transmitted to the user apparatus, and when it is determined that there is no sub cell candidate, the measurement instruction is not transmitted.
  • the user apparatus When receiving the measurement instruction, the user apparatus repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the user device can be improved and the power consumption can be reduced.
  • the radio base station does not transmit a measurement instruction, so that neither the radio base station nor the user apparatus performs a useless process.
  • the radio base station when the radio base station starts radio communication between the user apparatus and the radio base station, if the radio communication is determined not to be for voice call, the radio base station A measurement instruction for the reception quality measurement of the frequency band of the sub cell candidate managed by the radio base station that can be the sub cell is transmitted to the user apparatus, and the radio communication is determined to be for voice call. Do not send.
  • the user apparatus When receiving the measurement instruction, the user apparatus repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the user device can be improved and the power consumption can be reduced.
  • the wireless base station does not transmit a measurement instruction, so that neither the wireless base station nor the user apparatus performs a useless process.
  • UE user apparatus
  • eNB radio base station
  • eNB radio base station
  • the wireless communication network has a larger number of eNBs and can communicate with a larger number of UEs.
  • FIG. 5 is a sequence diagram showing a control procedure according to a first embodiment of the present invention required for adding a subcell for carrier aggregation.
  • the eNB detects the start of radio communication from the UE (that is, start of radio communication between the UE and the radio base station), the eNB first starts a timer.
  • Reconfiguration message is a measurement instruction
  • a measurement gap Measurement Gap
  • the UE When receiving the RRC Connection Reconfiguration message which is this measurement instruction, the UE activates the measurement gap as instructed by the RRC Connection Reconfiguration message. That is, the UE sets the UE itself so that the UE can measure the reception quality related to the cell with which the UE is not currently communicating at periodic time intervals. Then, the UE sets the UE itself so that the UE can measure the reception quality in the frequency band of the subcell candidate specified in the RRC ⁇ ⁇ ⁇ ⁇ Connection ⁇ ⁇ ⁇ ⁇ Reconfiguration message. After completion of these settings, the UE transmits an RRC Connection Reconfiguration Complete message indicating that these settings of the UE have been completed to the eNB.
  • the UE periodically and repeatedly measures the reception quality of the sub-cell candidate frequency band, and repeatedly transmits a report (Measurement Report) indicating the measurement result to the eNB.
  • the reception quality measured by the UE is, for example, the reference signal reception power (RSRP), but the signal-to-interference noise ratio (Signal-to-Interference ⁇ ⁇ Noise Ratio, SINR), reference signal reception quality (Reference Signal Received Quality, RSRQ), or other indicators.
  • RSRP reference signal reception power
  • SINR Signal-to-Interference noise ratio
  • RSRQ Reference Signal Received Quality
  • the eNB determines whether or not to add a secondary cell for the UE that has transmitted the Measurement-Report. More specifically, the eNB compares the reception quality at the UE for the frequency band of the subcell candidate indicated in Measurement Report with the threshold, and the reception quality in the frequency band of the subcell candidate exceeds the threshold. Then, the eNB may determine that the sub cell should be added, and if the reception quality in the frequency band of the sub cell candidate is less than the threshold, the eNB may determine that the sub cell should not be added.
  • the UE may measure not only the reception quality of the frequency band of the subcell candidate but also the reception quality of the frequency band of the main cell currently used by the UE, and include these measurement results in the Measurement Report.
  • the eNB compares the reception quality in the frequency band of the main cell indicated in the Measurement Report with the reception quality at the UE for the frequency band of the sub cell candidate, and the reception quality in the frequency band of the sub cell candidate is ENB determines that the sub cell should be added if the reception quality of the frequency band of the sub cell is exceeded, and if the reception quality in the frequency band of the sub cell candidate is less than the reception quality of the frequency band of the main cell, the eNB It may be determined that a secondary cell should not be added.
  • the eNB may correct the reception quality in the frequency band of the main cell or the reception quality in the frequency band of the sub cell candidate, and use the corrected reception quality for comparison.
  • a subcell candidate with good communication quality is added as a subcell, but a subcell candidate with poor communication quality is not added as a subcell.
  • eNB When eNB judges that a subcell should not be added (for example, judgment after the first Measurement Report of FIG. 5), eNB does not transmit a message to UE. On the other hand, when eNB judges that a subcell should be added (for example, judgment after 2nd and 3rd Measurement-Report in FIG. 5), eNB transmits RRC-Connection Reconfiguration message to UE. To do.
  • This RRC Connection Reconfiguration message is an instruction to add a subcell that specifies the frequency band of the subcell to be added.
  • the UE When receiving the RRC Connection Reconfiguration message, which is an instruction to add this subcell, the UE adds the subcell as indicated in the RRC Connection Reconfiguration message (that is, the frequency at which the SCC corresponding to the subcell can be used). To add). After completion of the addition of the sub cell, the UE transmits an RRC Connection Reconfiguration Complete message indicating that the addition of the sub cell is completed to the eNB.
  • the eNB may instruct the UE to change the frequency band of the subcell candidate for which the UE should measure the reception quality based on the Measurement Report. This is because the sub cell to be used or added by the UE may change according to the change in the UE position.
  • the eNB includes the instruction indicating the frequency band of the new subcell candidate in the RRCRRConnection Reconfiguration message that is an instruction to add the subcell. There may be one frequency band for a new subcell candidate, but there may be a plurality of frequency bands.
  • the UE changes the frequency band of the sub cell candidate whose reception quality is to be measured.
  • the above timer expires after a certain period of time.
  • the eNB is an RRC that is a measurement stop instruction that instructs to stop measurement of reception quality in the frequency band of the subcell candidate Send a Connection Reconfiguration message to the UE.
  • indicates to stop the measurement of the reception quality in the frequency band of a subcell candidate with the stop of a measurement gap (Measurement
  • the UE When receiving the RRC Connection Reconfiguration message that is this measurement stop instruction, the UE stops the measurement gap and stops measuring the reception quality of the frequency band of the subcell candidate as instructed by the RRC Connection Reconfiguration message. That is, the UE sets itself so that the UE does not measure the reception quality of the frequency band of the subcell candidate at periodic time intervals. After completion of this setting, the UE transmits an RRC Connection Reconfiguration Complete message indicating that this setting of the UE is completed to the eNB.
  • the UE transmits a measurement report to the eNB three times from the start of the timer to the expiration. That is, the length of the fixed time measured by the timer is at least three times the measurement gap and less than four times. However, the length of the fixed time measured by the timer is arbitrary.
  • the UE stops the measurement gap and stops the measurement of the reception quality of the frequency band of the sub cell candidate.
  • the UE can measure the reception quality of the frequency band of the sub cell candidate without using the measurement gap. As a result, the UE can add a sub cell.
  • FIG. 6 is a block diagram showing a configuration of radio base station (eNB) 110 according to the first embodiment of the present invention.
  • the eNB 110 includes cells 111, 112, and 113, and an inter-base station communication interface 116.
  • Each of the cells 111, 112, and 113 includes a wireless transmission unit 114, a wireless reception unit 115, and a control unit 122.
  • the wireless transmission unit 114 is a wireless transmission circuit that transmits a wireless signal to the UE that communicates with the cell in which the wireless transmission unit 114 is provided, and the wireless reception unit 115 communicates with the cell in which the wireless reception unit 115 is provided. It is a radio reception circuit which receives a radio signal from UE which performs.
  • the inter-base station communication interface 116 is an interface for communicating with other radio base stations, through which the eNB 110 communicates with a low-power radio base station (for example, a pico base station) and other eNBs managed by the eNB 110 itself. Communication is possible. Although not shown, the low-power radio base station also has at least one cell.
  • the eNB 110 manages not only the internal cells 111, 112, and 113 but also the cells of the low-power radio base station.
  • the control unit 122 includes a communication start detection unit 1220, a timer 1221, a measurement instruction unit 1222, a report reception unit 1224, a sub cell addition instruction unit 1226, a frequency band change instruction unit 1228, and a measurement stop instruction unit 1230.
  • the control unit 122 is a CPU (central processing unit), for example, and operates according to a computer program.
  • the communication start detection unit 1220, the measurement instruction unit 1222, the report reception unit 1224, the subcell addition instruction unit 1226, the frequency band change instruction unit 1228, and the measurement stop instruction unit 1230 are realized by the control unit 122 functioning according to the computer program. Functional block.
  • the communication start detection unit 1220 detects the start of wireless communication from the UE (more specifically, the start of wireless communication between the cell provided with the communication start detection unit 1220 and the UE using the cell as a main cell). To do.
  • the communication start detection unit 1220 detects the start of wireless communication between the UE and the eNB 110, the communication start detection unit 1220 activates the timer 1221 and immediately activates the measurement instruction unit 1222.
  • the measurement instruction unit 1222 is managed by the eNB 110, which can be a sub cell for the UE, using the cell in which the measurement instruction unit 1222 is provided as a main cell.
  • the radio transmission unit 114 transmits a reception quality measurement instruction (first RRC Connection ⁇ Reconfiguration message in FIG.
  • the report receiving unit 1224 repeatedly receives a report (Measurement Report) on the measurement result of the reception quality of the frequency band of the sub cell candidate from the UE using the cell in which the report receiving unit 1224 is provided as the main cell.
  • the Measurement Report may include the measurement result of the reception quality in the frequency band of the main cell currently used by the UE.
  • the secondary cell addition instructing unit 1226 determines whether or not a secondary cell should be added for the UE that has transmitted the Measurement® Report based on the Measurement® Report received by the report receiving unit 1224. The criteria for the determination are as described above.
  • the subcell addition instruction unit 1226 determines that a subcell should be added, the subcell addition instruction unit 1226 instructs the UE to add a subcell (second and third in FIG. 5). RRC Connection Reconfiguration message) is transmitted using the wireless transmission unit 114.
  • indication part 1226 judges that a subcell should not be added, the subcell addition instruction
  • the frequency band change instruction unit 1228 generates an instruction to change the frequency band of the subcell candidate for which the UE should measure the reception quality, based on the Measurement Report received by the report receiving unit 1224. This change instruction indicates a frequency band of a new subcell candidate for the UE. Further, the frequency band change instruction unit 1228 includes this change instruction in the RRCRRConnection Reconfiguration message, and transmits this RRC Connection Reconfiguration message to the UE using the radio transmission unit 114.
  • measurement stop instruction unit 1230 instructs UE to stop the measurement of the reception quality of the frequency band of the subcell candidate.
  • a measurement stop instruction (the last RRC Connection Reconfiguration message in FIG. 5) is transmitted using the wireless transmission unit 114.
  • FIG. 7 is a block diagram showing a configuration of user apparatus (UE) 130 according to the first embodiment of the present invention.
  • the UE 130 includes a wireless transmission unit 132, a wireless reception unit 134, and a control unit 136.
  • the wireless transmission unit 132 is a wireless transmission circuit that transmits a wireless signal
  • the wireless reception unit 134 is a wireless reception circuit that receives a wireless signal.
  • the radio transmission unit 132 transmits a radio signal to any cell managed by the eNB 110
  • the radio reception unit 134 receives a radio signal from any cell managed by the eNB 110.
  • the control unit 136 includes a measurement instruction reception unit 1360, a reception quality measurement unit 1364, a report transmission unit 1366, a measurement stop instruction reception unit 1368, a sub cell addition instruction reception unit 1369, and a sub cell addition unit 1370.
  • the control unit 136 is a CPU, for example, and operates according to a computer program.
  • the measurement instruction reception unit 1360, the reception quality measurement unit 1364, the report transmission unit 1366, the measurement stop instruction reception unit 1368, the sub cell addition instruction reception unit 1369, and the sub cell addition unit 1370 are controlled by the control unit 136 functioning according to the computer program. It is a functional block that is realized.
  • the measurement instruction receiving unit 1360 is a measurement instruction of the reception quality of the frequency band of the sub cell candidate transmitted from the main cell for this UE 130 which is one of the cells managed by the eNB 110 (first RRC Connection Reconfiguration message in FIG. 5). Is received using the wireless receiving unit 134.
  • the reception quality measuring unit 1364 activates the measurement gap in accordance with the measurement instruction, and repeatedly measures the reception quality in the frequency band of the subcell candidate specified in the measurement instruction.
  • the measurement result of the reception quality measurement unit 1364 is passed to the report transmission unit 1366 for each measurement, and the report transmission unit 1366 wirelessly transmits a report (Measurement Report) on the measurement result of the reception quality of the frequency band of the subcell candidate. It transmits to eNB110 using part 132. Report transmission section 1366 transmits MeasurementMeasureReport to the main cell every time reception quality measurement section 1364 measures reception quality.
  • the measurement instruction receiving unit 1360 receives, using the radio receiving unit 134, an RRC ⁇ Connection Reconfiguration message including an instruction to change the frequency band of the sub cell candidate for which the UE 130 should measure the reception quality.
  • the reception quality measuring unit 1364 measures the reception quality in the frequency band of a new subcell candidate for the UE 130 indicated in the RRC Connection Reconfiguration message. To do.
  • the measurement stop instruction receiving unit 1368 receives the RRCNBConnectionRRReconfiguration message, which is a measurement stop instruction, from the eNB 110 using the wireless reception unit 134.
  • the reception quality measuring unit 1364 stops the measurement gap and stops measuring the reception quality of the frequency band of the subcell candidate.
  • the sub cell addition instruction receiving unit 1369 receives an RRC Connection Reconfiguration message that is a sub cell addition instruction from the eNB 110 using the radio reception unit 134.
  • the subcell adding unit 1370 adds the subcell as instructed by the subcell addition instruction (that is, the SCC corresponding to the subcell is added). Add to available frequencies). More specifically, the sub cell adding unit 1370 registers the SCC corresponding to the sub cell in a memory (not shown) as a usable frequency.
  • each cell of the eNB 110 transmits a measurement stop instruction instructing the UE to stop measuring the reception quality of the frequency band of the subcell candidate when a certain time has elapsed since the transmission of the measurement instruction.
  • the UE stops measuring the reception quality of the frequency band of the subcell candidate. Therefore, the throughput of the UE can be improved and the power consumption can be reduced.
  • the time when 1222 transmits the measurement instruction is the time when the user apparatus originates wireless communication, when the UE receives wireless communication, when the UE reconnects to the wireless base station, At least one of the transition from the discontinuous reception (DRX, DiscontinuousceptionReception) state to the non-discontinuous reception state (Non-DRX, Non-Discontinuous Reception) and the handover from another radio base station to the radio base station It's time.
  • the timing at which the measurement instruction is transmitted may be any one of these timings, any combination of two or more, or all. Since a signal flows between the UE 130 and the main cell of the eNB 110 from these times, by starting the timer 1221 at these times, the UE 130 follows the instruction of the eNB 110 for a certain time from the start of the signal flow. The reception quality of the frequency band of the cell candidate is measured, a measurement report is transmitted to the eNB 110, and a sub cell is added in some cases. Therefore, UE 130 measures the reception quality of the frequency band of the sub cell candidate according to the instruction from eNB 110 and transmits a Measurement Report to eNB 110 only in a period when the necessity of adding a sub cell is considered to be high. Add a cell.
  • FIG. 8 is a block diagram showing a configuration of a radio base station (eNB) 110 according to a second embodiment of the present invention.
  • the configuration of the eNB 110 according to the second embodiment is almost the same as that of the first embodiment, but the control unit 122 of each cell further includes a sub cell candidate determination unit 1232 and a communication type determination unit 1234.
  • the UE according to the second embodiment may be the same as the UE 130 according to the first embodiment.
  • the operation of the second embodiment is basically the same as that of the first embodiment, but the differences will be described in detail below.
  • the sub cell candidate determination unit 1232 and the communication type determination unit 1234 are functional blocks realized by the control unit 122 functioning according to the computer program.
  • the communication start detection unit 1220 detects the start of wireless communication from the UE (that is, the start of wireless communication between the cell in which the communication start detection unit 1220 is provided and the UE 130)
  • the sub cell candidate determination unit 1232 may It is determined whether there is a sub cell candidate managed by eNB 110 that can be a cell.
  • communication type determination unit 1234 determines whether or not the wireless communication is for a voice call.
  • the control unit 122 of each cell sets the timer 1221 when the sub cell candidate determination unit 1232 determines that there is a sub cell candidate and when the communication type determination unit 1234 determines that wireless communication is not for voice communication.
  • the measurement instruction unit 1222 is activated immediately after the activation. Therefore, when subcell candidate determination section 1232 determines that there is a subcell candidate, and when communication type determination section 1234 determines that wireless communication is not for a voice call, measurement instruction section 1222 receives a measurement instruction. A certain RRC Connection Reconfiguration message is transmitted to the UE 130.
  • the measurement instruction unit 1222 does not transmit a measurement instruction.
  • the measurement instruction unit 1222 does not transmit a measurement instruction.
  • the communication type determination unit 1234 determines that the wireless communication is for a voice call.
  • the second embodiment Since the operation of the second embodiment is basically the same as the operation of the first embodiment, the second embodiment also has the same effect as the first embodiment. Furthermore, in this embodiment, eNB110 does not transmit a measurement instruction
  • UE 130 When receiving the measurement instruction, UE 130 repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the UE 130 can be further improved and the power consumption can be reduced.
  • the eNB 110 does not transmit a measurement instruction, so that neither the eNB 110 nor the UE 130 performs a useless process.
  • eNB 110 does not transmit a measurement instruction when it is determined that wireless communication is for a voice call when starting wireless communication between UE 130 and eNB 110.
  • UE 130 When receiving the measurement instruction, UE 130 repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the UE 130 can be further improved and the power consumption can be reduced.
  • a voice call since a high communication speed is generally not necessary, there is little need for carrier aggregation, and there is little need for adding a secondary cell.
  • the eNB 110 and the UE 130 do not need to perform a useless process because the eNB 110 does not transmit a measurement instruction.
  • the RRC ⁇ ⁇ ⁇ Connection ⁇ Reconfiguration message which is a measurement instruction, may not be transmitted from the eNB 110 to the UE 130.
  • the UE 130 does not activate the measurement gap.
  • the UE can measure the reception quality of the frequency band of the sub cell candidate without using the measurement gap. As a result, the UE can add a sub cell.
  • the time when the communication start detection unit 1220 detects the start of wireless communication between the UE 130 and the eNB 110 is the same as in the first embodiment, when the wireless communication is transmitted from the user apparatus, or when the wireless communication is received by the UE. , At the time of reconnection of the UE to the radio base station, at the time of transition from the intermittent reception state of the UE to the non-discontinuous reception state, and at the time of handover from another eNB to the eNB 110. At this time, the sub cell candidate determination unit 1232 determines whether there is a sub cell candidate managed by the eNB 110 that can be a sub cell for the UE 130, and the communication type determination unit 1234 determines that the radio communication is a voice call. It is determined whether or not.
  • the sub cell candidate determination unit 1232 determines whether or not there is a sub cell candidate managed by the eNB 110 that can be a sub cell for the UE 130 only at the time of handover from another eNB to the eNB 110, and performs measurement.
  • the operation of the instruction unit 1222 may depend on the determination result.
  • control part 122 of each cell of eNB110 is provided with the subcell candidate judgment part 1232 and the communication type judgment part 1234, this invention is not limited to 2nd Embodiment, Each cell's The control unit 122 may exclude the subcell candidate determination unit 1232 or the communication type determination unit 1234.
  • measurement instruction unit 1222 transmits an RRCRRConnection Reconfiguration message that is a measurement instruction to UE 130.
  • the measurement instruction unit 1222 does not transmit a measurement instruction.
  • the measurement instruction unit 1222 determines that RRC Connection Reconfiguration is a measurement instruction.
  • measurement instruction unit 1222 does not transmit a measurement instruction.
  • FIG. 9 is a block diagram showing a configuration of a radio base station (eNB) 110 according to a third embodiment of the present invention.
  • the configuration of the eNB 110 according to the third embodiment is almost the same as that of the second embodiment, but the control unit 122 of each cell does not have the measurement stop instruction unit 1230.
  • the UE according to the third embodiment may be the same as the UE 130 according to the first embodiment, but the measurement stop instruction receiving unit 1368 is not necessary.
  • the operation of the third embodiment is basically the same as the operation of the second embodiment, the eNB 110, even if a certain time has elapsed since the transmission of the measurement instruction, the eNB 110 A measurement stop instruction for instructing stop of measurement of reception quality in the candidate frequency band is not transmitted. Therefore, once receiving the measurement instruction, the UE 130 repeatedly measures the reception quality of the frequency band of the subcell candidate over a long period of time according to the instruction of the eNB 110, and repeats transmitting the Measurement-Report to the eNB 110.
  • eNB 110 does not transmit a measurement instruction when it is determined that there is no sub cell candidate for UE 130 at the start of wireless communication between UE 130 and eNB 110.
  • UE 130 When receiving the measurement instruction, UE 130 repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the UE 130 can be further improved and the power consumption can be reduced.
  • the eNB 110 does not transmit a measurement instruction, so that neither the eNB 110 nor the UE 130 performs a useless process.
  • eNB 110 does not transmit a measurement instruction when it is determined that wireless communication is for a voice call when starting wireless communication between UE 130 and eNB 110.
  • UE 130 When receiving the measurement instruction, UE 130 repeatedly measures the reception quality of the frequency band of the sub cell candidate, but does not measure the reception quality of the frequency band of the sub cell candidate unless receiving the measurement instruction. Therefore, the throughput of the UE 130 can be further improved and the power consumption can be reduced.
  • a voice call since a high communication speed is generally not necessary, there is little need for carrier aggregation, and there is little need for adding a secondary cell.
  • the eNB 110 and the UE 130 do not need to perform a useless process because the eNB 110 does not transmit a measurement instruction.
  • the RRC ⁇ ⁇ ⁇ Connection ⁇ Reconfiguration message which is a measurement instruction, may not be transmitted from the eNB 110 to the UE 130.
  • the UE 130 does not activate the measurement gap.
  • the UE can measure the reception quality of the frequency band of the sub cell candidate without using the measurement gap. As a result, the UE can add a sub cell.
  • the time when the communication start detection unit 1220 detects the start of wireless communication between the UE 130 and the eNB 110 is the same as in the first embodiment, when the wireless communication is transmitted from the user apparatus, or when the wireless communication is received by the UE. , At the time of reconnection of the UE to the radio base station, at the time of transition from the intermittent reception state of the UE to the non-discontinuous reception state, and at the time of handover from another eNB to the eNB 110. At this time, the sub cell candidate determination unit 1232 determines whether there is a sub cell candidate managed by the eNB 110 that can be a sub cell for the UE 130, and the communication type determination unit 1234 determines that the radio communication is a voice call. It is determined whether or not.
  • the sub cell candidate determination unit 1232 determines whether or not there is a sub cell candidate managed by the eNB 110 that can be a sub cell for the UE 130 only at the time of handover from another eNB to the eNB 110, and performs measurement.
  • the operation of the instruction unit 1222 may depend on the determination result.
  • control part 122 of each cell of eNB110 is provided with the subcell candidate judgment part 1232 and the communication type judgment part 1234, this invention is not limited to 3rd Embodiment, Each cell's The control unit 122 may exclude the subcell candidate determination unit 1232 or the communication type determination unit 1234.
  • measurement instruction unit 1222 transmits an RRCRRConnection Reconfiguration message that is a measurement instruction to UE 130.
  • the measurement instruction unit 1222 does not transmit a measurement instruction.
  • the measurement instruction unit 1222 determines that RRC Connection Reconfiguration is a measurement instruction.
  • measurement instruction unit 1222 does not transmit a measurement instruction.
  • each function executed by the CPU may be executed by hardware instead of the CPU, or, for example, programmable logic such as FPGA (Field Programmable Gate Array) and DSP (Digital Signal Processor) May run on the device.
  • programmable logic such as FPGA (Field Programmable Gate Array) and DSP (Digital Signal Processor) May run on the device.
  • whether to add a SCell in the eNB 110 is determined based on the amount of hardware resources of the eNB 110, the usage status of each frequency band, or an operation criterion for adding a cell in a preset carrier aggregation May be based on
  • control unit 112 of each cell various functions are provided in the control unit 112 of each cell. These functions may be arranged in these control units in a manner different from that of the embodiment, or some of these functions may be arranged in other control units.
  • 110 eNB radio base station
  • 114 radio transmission unit 115 radio reception unit
  • 116 inter-base station communication interface 122 control unit, 1220 communication start detection unit, 1221 timer, 1222 measurement instruction unit, 1224 report reception unit, 1226 sub Cell addition instruction unit, 1228 frequency band change instruction unit, 1230 measurement stop instruction unit, 1232 sub-cell candidate determination unit, 1234 communication type determination unit, 130 user equipment (UE), 132 radio transmission unit, 134 radio reception unit, 136 control Unit, 1360 measurement instruction reception unit, 1364 reception quality measurement unit, 1366 report transmission unit, 1368 measurement stop instruction reception unit, 1369 subcell addition instruction reception unit, 1370 subcell addition unit.
  • UE user equipment

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Lorsqu'une communication sans fil entre un dispositif d'utilisateur et une station de base sans fil démarre, la station de base sans fil transmet, au dispositif d'utilisateur, une instruction conduisant à mesurer la qualité de réception de la bande de fréquence des candidats de cellule secondaire qui sont gérés par la station de base sans fil et sont susceptibles de devenir une cellule secondaire pour le dispositif d'utilisateur. La station de base sans fil reçoit de manière répétée des rapports du dispositif d'utilisateur relatifs aux résultats des mesures pour la qualité de réception de la bande de fréquence des candidats de cellule secondaire, et en fonction des rapports reçus, transmet une instruction secondaire d'ajout de cellule au dispositif d'utilisateur. Lorsqu'un intervalle fixe s'est écoulé depuis la transmission de l'instruction de mesure, la station de base sans fil transmet une instruction d'arrêt de mesure au dispositif d'utilisateur, pour enjoindre celui-ci à arrêter la mesure de la qualité de réception de la bande de fréquence des candidats de cellule secondaire. En recevant l'instruction d'arrêt de mesure, le dispositif d'utilisateur arrête de mesurer la qualité de réception de la bande de fréquence des candidats de cellule secondaire.
PCT/JP2013/072983 2012-10-05 2013-08-28 Système de communication sans fil, station de base sans fil, dispositif d'utilisateur et procédé de communication sans fil WO2014054356A1 (fr)

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WO2022067575A1 (fr) * 2020-09-29 2022-04-07 华为技术有限公司 Procédé et appareil de soumission de rapport de mesure

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CN113767664A (zh) * 2019-05-02 2021-12-07 株式会社Ntt都科摩 用户装置以及通信方法
CN113767664B (zh) * 2019-05-02 2024-05-07 株式会社Ntt都科摩 用户装置以及通信方法
WO2022067575A1 (fr) * 2020-09-29 2022-04-07 华为技术有限公司 Procédé et appareil de soumission de rapport de mesure

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