WO2022137554A1 - Station de base sans fil - Google Patents

Station de base sans fil Download PDF

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Publication number
WO2022137554A1
WO2022137554A1 PCT/JP2020/048921 JP2020048921W WO2022137554A1 WO 2022137554 A1 WO2022137554 A1 WO 2022137554A1 JP 2020048921 W JP2020048921 W JP 2020048921W WO 2022137554 A1 WO2022137554 A1 WO 2022137554A1
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WIPO (PCT)
Prior art keywords
cell
base station
secondary cell
handover
radio base
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PCT/JP2020/048921
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English (en)
Japanese (ja)
Inventor
朋樹 横川
真哉 岡村
英和 下平
皓平 原田
Original Assignee
株式会社Ｎｔｔドコモ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to PCT/JP2020/048921 priority Critical patent/WO2022137554A1/fr
Priority to JP2022570990A priority patent/JPWO2022137554A1/ja
Publication of WO2022137554A1 publication Critical patent/WO2022137554A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • 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
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present disclosure relates to a radio base station that supports handover using a primary / secondary cell.
  • the 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.
  • 5G New Radio
  • NG Next Generation
  • Radio resource management Radio Resource Management
  • NR-DC NR-NR Dual Connectivity
  • MR-DC Multi-RAT Dual Connectivity
  • HO with PSCell handover using a primary / secondary cell (PSCell) (HO with PSCell) is listed as a subject of consideration.
  • PCell primary cell
  • target the primary cell
  • eNB radio base station
  • gNB gNodeB
  • SCG secondary cell group
  • the above-mentioned HO with PS Cell has the following problems. Specifically, there is no standard for how the handover destination PCell selects PSCell and SCell included in the SCG, and it is appropriate to simply include the radio base station (sell) around the UE in the SCG. There is concern that connectivity cannot always be achieved.
  • the following disclosure was made in view of such a situation, and the purpose is to provide a wireless base station that can execute HO with PS Cell while setting an appropriate SCG.
  • One aspect of the present disclosure is a handover using a receiving unit (measurement report processing unit 120) for receiving a measurement report including reception quality related to peripheral cells of the terminal (UE200) from the terminal and a primary / secondary cell.
  • a radio base including a control unit (control unit 140) that selects the peripheral cell presumed to be close to the handover source cell as a secondary cell based on the quality and sets a secondary cell group including the primary / secondary cell. It is a station (radio base station 100).
  • One aspect of the present disclosure is based on the reception state of the reference signal in the handover using the transmission / reception unit (control signal / reference signal processing unit 130) for transmitting / receiving the reference signal to and from the terminal (UE200) and the primary / secondary cell.
  • a radio base station including a control unit (control unit 140) that selects a peripheral cell presumed to be close to the cell of the handover source as a secondary cell and sets a secondary cell group including the secondary cell.
  • One aspect of the present disclosure is a receiving unit (measurement report processing unit 120) that receives a measurement report on a peripheral cell from a terminal (UE200), estimates the amount of traffic in the peripheral cell based on the measurement report, and the traffic.
  • a radio base station radio base station 100 including a control unit (control unit 140) that selects a peripheral cell whose amount is smaller than a specified value as a secondary cell and sets a secondary cell group including the secondary cell in handover. Is.
  • One aspect of the present disclosure is a receiving unit (control signal / reference signal processing unit 130) that receives the capability information of the terminal (UE200) from the terminal, and the terminal according to the capability of the terminal based on the capability information.
  • a radio base station radio base station 100 including a control unit (control unit 140) that selects a peripheral cell of the above as a secondary cell and sets a secondary cell group including the secondary cell in a handover using the primary / secondary cell. Is.
  • One aspect of the present disclosure is a radio signal via a control unit (control unit 140) that sets a plurality of secondary cell groups including a secondary cell and a cell included in the secondary cell group in a handover using a primary / secondary cell.
  • the control unit includes a transmission / reception unit (wireless communication unit 110) for transmitting / receiving a signal, and the control unit selects any of the secondary cell groups according to the connection state of the terminal with the cell (radio base station 100). ).
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a diagram showing an example of handover (HO with PSCell) using PSCell.
  • FIG. 3 is a functional block configuration diagram of the radio base station 100.
  • FIG. 4 is a functional block configuration diagram of the UE 200.
  • FIG. 5 is a diagram showing a schematic communication sequence of SCG (cell) selection.
  • FIG. 6 is a diagram showing a cell selection and handover operation flow of the radio base station 100 according to the operation example 1.
  • FIG. 7 is a diagram showing a cell selection and handover operation flow of the radio base station 100 according to the operation example 2.
  • FIG. 8 is a diagram showing a cell selection and handover operation flow of the radio base station 100 according to the operation example 3.
  • FIG. 9 is a diagram showing a cell selection and handover operation flow of the radio base station 100 according to the operation example 4.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the radio base station 100 and the UE 200.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment.
  • the wireless communication system 10 is a wireless communication system according to Long Term Evolution (LTE) and 5G New Radio (NR).
  • LTE Long Term Evolution
  • NR 5G New Radio
  • LTE Long Term Evolution
  • 4G Long Term Evolution
  • 5G 5G New Radio
  • LTE and NR may be interpreted as wireless access technology (RAT), and in this embodiment, LTE may be referred to as a first wireless access technique and NR may be referred to as a second wireless access technique. good.
  • RAT wireless access technology
  • the wireless communication system 10 includes a wireless access network 20, hereafter, RAN20), and a user terminal 200 (UserEquipment200, hereafter, UE200).
  • RAN20 wireless access network 20
  • UE200 user terminal 200
  • the RAN20 includes radio base station 100.
  • the radio base station 100 may be gNB according to NR or eNB according to LTE.
  • the specific configuration of the wireless communication system 10 including the number of gNB / eNB and UE is not limited to the example shown in FIG.
  • Wireless communication system 10 corresponds to FR1 and FR2.
  • the frequency bands of each FR are as follows.
  • FR1 410 MHz to 7.125 GHz
  • FR2 24.25 GHz to 52.6 GHz
  • SCS Sub-Carrier Spacing
  • BW bandwidth
  • FR2 has a higher frequency than FR1, and SCS of 60 or 120 kHz (240 kHz may be included) is used, and a bandwidth (BW) of 50 to 400 MHz may be used.
  • the wireless communication system 10 may support a higher frequency band than the frequency band of FR2. Specifically, the wireless communication system 10 can support a frequency band exceeding 52.6 GHz and up to 114.25 GHz.
  • the radio base station 100 executes wireless communication with the UE 200 according to LTE or NR.
  • Radio base stations 100 and UE200 use Massive MIMO, which generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation that uses multiple component carriers (CC) in a bundle. It can support dual connectivity (DC) that communicates simultaneously between CA) and UE and multiple NG-RAN Nodes.
  • Massive MIMO which generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation that uses multiple component carriers (CC) in a bundle. It can support dual connectivity (DC) that communicates simultaneously between CA) and UE and multiple NG-RAN Nodes.
  • DC dual connectivity
  • the type of DC may be Multi-RAT Dual Connectivity (MR-DC) that uses multiple wireless access technologies, or NR-NR Dual Connectivity (NR-DC) that uses only NR.
  • the MR-DC may be an E-UTRA-NR Dual Connectivity (EN-DC) in which eNB constitutes a master node (MN) and gNB constitutes a secondary node (SN), and vice versa.
  • E-UTRA Dual Connectivity (NE-DC) may be used.
  • a master cell group (MCG) and a secondary cell group (SCG) may be set.
  • the MCG may include a primary cell (PCell) and the SCG may include a secondary cell (SCell).
  • the SCell may include a primary / secondary cell (PSCell).
  • PSCell is a type of SCell, but may be interpreted as a special SCell that has the same function as PCell. Similar to PCell, PSCell may execute PUCCH (Physical Uplink Control Channel) transmission, contention type random access procedure (CBRA), RadioLink Monitoring (downstream wireless quality monitoring) function, etc. ..
  • PUCCH Physical Uplink Control Channel
  • CBRA contention type random access procedure
  • RadioLink Monitoring downstream wireless quality monitoring
  • handover using PSCell may be called HO with PSCell.
  • the PCell of the handover destination before the UE200 whose DC is set executes the handover, the PCell of the handover destination (target) sets the SCG including the radio base station (eNB or gNB, which may be read as a cell) around the UE200. Set up and establish DC as soon as the handover is completed.
  • eNB or gNB radio base station
  • FIG. 2 shows an example of handover using PSCell (HO with PSCell). Specifically, FIG. 2 shows an example of HO with PS Cell when the UE 200 hands over from the NR stand-alone (NR SA) network to the EN-DC network.
  • NR SA NR stand-alone
  • a handover request (HO Request) is transmitted from the radio base station 100 in the NR-SA network to the radio base station 100 in the EN-DC network ((0) in the figure).
  • the radio base station 100 in the EN-DC network sets up the SCG in the EN-DC network in response to the handover request ((1) in the figure).
  • the radio base station 100 in the NR-SA network receives the response to the handover request (HO response) and the information of the target SCG to be the handover destination ((2) in the figure), and instructs the UE 200 to perform the handover (HO). (Instruct) ((3) in the figure).
  • the UE200 executes a handover to the EN-DC network based on the HO instruction, and executes a synchronization process with the radio base station 100 (eNB) and the SCG in the EN-DC network ((4) in the figure). ..
  • the UE200 executes measurement of peripheral cells (eNB / gNB) after the handover to the eNB (target PCell) of the handover destination is completed, adds SCG (PSCell and SCell), and sets EN-DC. Establish.
  • peripheral cells eNB / gNB
  • SCG PSCell and SCell
  • HO with PS Cell may be supported.
  • the target PCell may set up the SCG before the UE 200 executes the handover, and establish the EN-DC at the same time as the handover is completed.
  • the target PCell sets up the surrounding eNB / gNB (cell formed by) as SCG before the handover is executed.
  • the SCG information and HO response are transmitted from the target PCell to the handover source (source) PCell.
  • the handover command (HO command) is transmitted from the source PCell to the UE200
  • the information of the target SCG added when moving to the target PCell is also transmitted at the same time.
  • the UE 200 executes synchronization processing for both the target PCell and the target SCG based on the information of the HO command, and the handover is completed.
  • HO with PSCell can omit the measurement of peripheral cells, etc., and can establish EN-DC at an early stage. This contributes to the improvement of the data rate even at the time of handover.
  • FIG. 3 is a functional block configuration diagram of the radio base station 100.
  • the radio base station 100 includes a radio communication unit 110, a measurement report processing unit 120, a control signal / reference signal processing unit 130, and a control unit 140.
  • the wireless communication unit 110 sends and receives wireless signals according to LTE or NR. Specifically, the wireless communication unit 110 transmits a downlink signal (DL signal) according to LTE or NR, and receives an uplink signal (UL signal) according to LTE or NR.
  • DL signal downlink signal
  • UL signal uplink signal
  • the wireless communication unit 110 supports dual connectivity, and transmits / receives wireless signals via a cell group, specifically, a cell included in the MCG and / or SCG.
  • the wireless communication unit 110 may configure a transmission / reception unit for transmitting / receiving wireless signals.
  • the measurement report processing unit 120 executes processing related to the measurement report (Measurement Report) transmitted from the UE 200. Specifically, the measurement report processing unit 120 determines the measurement results of the serving cell and its peripheral cells (which may be referred to as neighboring cells or adjacent cells) executed by the UE 200, particularly the reception quality of the peripheral cells of the UE 200. You can receive the measurement report including it from UE200.
  • the wireless communication unit 110 may configure a receiving unit that receives a measurement report from the terminal.
  • the reception quality may include at least one of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality) and SINR (Signal-to-Interference plus Noise power Ratio).
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR Signal-to-Interference plus Noise power Ratio
  • the control signal / reference signal processing unit 130 executes processing related to various control signals transmitted / received by the wireless communication unit 110 and processing related to various reference signals transmitted / received by the wireless communication unit 110.
  • control signal / reference signal processing unit 130 receives various control signals transmitted from the radio communication unit 110 via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). .. Further, the control signal / reference signal processing unit 130 transmits various control signals to the wireless communication unit 110 via a predetermined control channel.
  • the control signal / reference signal processing unit 130 can receive the capability information (UE Capability Information) of the UE 200 from the UE 200.
  • the control signal / reference signal processing unit 130 may configure a receiving unit that receives capability information from the terminal.
  • the capability information may include at least the capability related to dual connectivity (DC), for example, the number of SCG cells supported by the UE200, and the frequency band to which the UE200 can be connected (may be FR).
  • DC dual connectivity
  • the capability information is not limited to the capability of the UE 200, and may include, for example, the capability related to the transmission power, the transmission beam, the antenna, and the like.
  • the channel may include a control channel and a data channel.
  • Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI)), and Physical. Broadcast Channel (PBCH) etc. may be included.
  • PDCCH Physical Downlink Control Channel
  • PUCCH Physical Uplink Control Channel
  • RACH Random Access Radio Network Temporary Identifier
  • DCI Downlink Control Information
  • PBCH Broadcast Channel
  • the data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data may mean data transmitted over a data channel.
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Uplink Shared Channel
  • the control signal / reference signal processing unit 130 executes processing using a reference signal (RS) such as Demodulation Reference Signal (DMRS) and Channel State Information-Reference Signal (CSI-RS).
  • RS reference signal
  • DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation.
  • CSI-RS is a downlink reference signal for channel state measurement.
  • the reference signal may include Phase Tracking Reference Signal (PTRS), Sounding Reference Signal (SRS), Positioning Reference Signal (PRS) for location information, and the like. That is, the reference signal transmitted by the radio base station 100 and the reference signal transmitted by the UE 200 (received by the radio base station 100) may be included.
  • PTRS Phase Tracking Reference Signal
  • SRS Sounding Reference Signal
  • PRS Positioning Reference Signal
  • control signal / reference signal processing unit 130 can send and receive the reference signal to and from the UE 200.
  • control signal / reference signal processing unit 130 may configure a transmission / reception unit for transmitting / receiving a reference signal.
  • the control unit 140 controls each functional block constituting the radio base station 100.
  • the control unit 140 executes control regarding the handover of the UE 200.
  • the handover may be interpreted in the same manner as the expression such as cell selection, cell reselection, or cell transition. Further, in the present embodiment, it may be interpreted as HO with PSCell using PSCell.
  • the control unit 140 can execute control related to handover, which supports dual connectivity (DC) in particular. Specifically, the control unit 140 sets a peripheral cell (PSCell) that is presumed to be close to the cell that is the handover source of the UE200 based on the reception quality (RSRP, etc.) included in the measurement report (MR) received from the UE200. May be). The control unit 140 can set the SCG including the selected SCell.
  • DC dual connectivity
  • RSRP reception quality
  • MR measurement report
  • the method of estimating the peripheral cells that are estimated to be close to the cell of the handover source based on the reception quality is not particularly limited, but for example, the peripheral cells having the best reception quality or the reception quality of a predetermined value or more are the cells of the handover source. It may be estimated that the cell is close to.
  • the control unit 140 can select a peripheral cell presumed to be close to the cell of the handover source as an SCell (may be a PSCell) based on the reception status of the UE 200 and the transmitted and / or received reference signal.
  • the control unit 140 can set the SCG including the selected SCell.
  • the control unit 140 acquires the RTT (Round Trip Time) between the UE 200 and the radio base station 100 using the reference signal (RS), and determines the position of the UE 200 based on the acquired RTT value (time). Can be estimated.
  • the control unit 140 may select a cell close to the estimated position of the UE 200. At this time, if available, the control unit 140 may use the arrangement information (stationation information) of the cell (radio base station) possessed by the operator of the wireless communication system 10.
  • the control unit 140 can estimate the traffic volume in the peripheral cells based on the measurement report received from the UE 200.
  • the control unit 140 can select a peripheral cell whose estimated traffic amount is smaller than the specified value as an SCell (may be a PSCell), and set an SCG including the SCell in the handover (particularly, HO with PSCell).
  • the method for estimating the traffic amount is not particularly limited, but for example, information such as the transmission power and modulation method of the UE200 is acquired based on the reception quality included in the MR, and the amount of data transmitted and received by each UE200 from the acquired information. By calculating, the amount of traffic sent and received by each of the peripheral cells may be estimated.
  • the control unit 140 selects a peripheral cell of the UE200 according to the capability of the UE200 as an SCell (may be a PSCell) based on the capability information (UECapability Information) of the UE200, and performs the relevant handover (particularly, HO with PSCell).
  • SCell may be a PSCell
  • UECapability Information the capability information of the UE200
  • control unit 140 selects an appropriate number of SCGs according to the number of SCG cells supported by the UE200, or FR1 depending on the frequency band to which the UE200 can be connected (for example, FR1 only). You may select an SCG that contains cells that utilize FR2 (that is, do not select an SCG that contains cells that utilize FR2).
  • control unit 140 may set a plurality of SCGs including SCell (may include PSCell) in the handover (particularly, HO with PSCell). For example, the control unit 140 may set up three SCGs in the HO with PS Cell and select one of the SCGs according to the connection state with the cell of the UE 200.
  • the control unit 140 determines any SCG according to the connection state (for example, whether or not synchronization can be established) between any cell (may be PSCell) included in the set SCG and the UE 200. Can be selected. For example, if the UE 200 tries to connect to the cell of the first SCG but synchronization cannot be established, it may try to connect to the cell of the second SCG. Alternatively, the UE 200 may connect to each of the three SCGs so that the SCG in the best condition is selected.
  • the connection state for example, whether or not synchronization can be established
  • the UE 200 may try to connect to the cell of the second SCG.
  • the UE 200 may connect to each of the three SCGs so that the SCG in the best condition is selected.
  • SCG SCell including PSCell
  • PSCell PSCell
  • the control unit 140 uses the station placement information of the cell (radio base station) possessed by the operator of the wireless communication system 10 in the HO with PSCell to perform the handover of the UE 200. You may select a cell that is close to the original cell. Alternatively, the control unit 140 may select a cell close to the cell of the UE 200 from which the handover is made by using the candidate cell list of the handover destination.
  • the candidate cell list of the handover destination for example, Neighbor list (see 3GPP TS38.133) may be used. An example of the candidate cell list of the handover destination will be further described later.
  • FIG. 4 is a functional block configuration diagram of the UE 200.
  • the UE 200 includes a wireless communication unit 210, a control signal / reference signal processing unit 220, a quality measurement unit 230, and a control unit 240.
  • the wireless communication unit 210 sends and receives wireless signals according to NR. Specifically, the wireless communication unit 210 transmits an uplink signal (UL signal) according to NR and receives a downlink signal (DL signal) according to NR.
  • UL signal uplink signal
  • DL signal downlink signal
  • the wireless communication unit 210 supports Massive MIMO, CA that bundles multiple CCs, and DC that communicates between UE and each of the two RAN Nodes at the same time.
  • the control signal / reference signal processing unit 220 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.
  • control signal / reference signal processing unit 220 receives various control signals transmitted from the radio base station 100 via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). .. Further, the control signal / reference signal processing unit 220 transmits various control signals to the radio base station 100 via a predetermined control channel.
  • a predetermined control channel for example, control signals of the radio resource control layer (RRC). ..
  • RRC radio resource control layer
  • the control signal / reference signal processing unit 220 executes processing using a reference signal (RS) such as DMRS and CSI-RS.
  • RS reference signal
  • DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation.
  • PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.
  • the reference signal may include ChannelStateInformation-ReferenceSignal (CSI-RS), SoundingReferenceSignal (SRS), PositioningReferenceSignal (PRS) for position information, and the like. ..
  • CSI-RS ChannelStateInformation-ReferenceSignal
  • SRS SoundingReferenceSignal
  • PRS PositioningReferenceSignal
  • control signal / reference signal processing unit 220 can execute processing related to the capability information (UE Capability Information) of the UE 200.
  • the control signal / reference signal processing unit 220 can transmit UE Capability Information in response to an inquiry (UE Capability Inquiry) for capability information from the radio base station 100.
  • the quality measuring unit 230 measures the reception quality of the serving cell of the UE 200 and the peripheral cells formed around the serving cell.
  • the quality measurement unit 230 can measure the reception quality using a synchronization signal block (SSB: SS / PBCH Block), CSI-RS, or the like.
  • SSB synchronization signal block
  • the reception quality may include at least one of RSRP, RSRQ and SINR.
  • RSRP is the reception level of the reference signal measured in the UE200
  • RSRQ is the reception quality of the reference signal measured in the UE200 (the ratio of the power of the cell-specific reference signal to the total power within the receive bandwidth). Can be interpreted).
  • SMTC Measurement Timing Configuration
  • the SMTC window is a network (radio base station) because the UE200 recognizes the measurement start timing, measurement period, and measurement cycle for each cell to be measured when the UE200 performs reception quality measurement using SSB. It may be interpreted as a measurement window set in UE200 from 100).
  • the control unit 240 controls each functional block constituting the UE 200.
  • the control unit 240 transmits UE Capability Information by the control signal / reference signal processing unit 220, transmits / receives a reference signal, and measures reception quality (RSRP, RSRQ, SINR) by the quality measurement unit 230, and the like. Performs control over.
  • RSRP reception quality
  • RSRQ reception quality
  • the operation in which the handover destination PCell selects eNB / gNB as the SCG is defined below. Specifically, it defines the SCG setup (which may be read as setting) method in HO with PS Cell.
  • FIG. 5 shows a schematic communication sequence for SCG (cell) selection.
  • the RAN 20 (specifically, the radio base station 100) can receive the capability information (UE Capability Information) of the UE 200.
  • the UE capability may include the number of SCG cells supported by the UE 200 used to select the SCG, the frequency band to which the UE 200 can be connected, and the like.
  • RAN20 can select the peripheral cells of UE200 according to the capability of UE200 as SCell (may be PSCell).
  • the RAN20 can also receive a measurement report (MR) containing measurement results (such as the transmission power of the UE200) used to estimate the traffic volume of RSRP, RSRQ, SINR, etc. measured by the UE200 and / or the radio base station. ..
  • MR measurement report
  • the RAN20 (radio base station 100) can select a peripheral cell (may be a PS Cell) that is presumed to be close to the cell that is the handover source of the UE 200 based on the reception quality such as RSRP.
  • the radio base station 100 can select SCG (SCell) based on other than the capability information of the UE 200 or the measurement report, but a specific operation example will be further described below.
  • FIG. 6 shows a cell selection and handover operation flow of the radio base station 100 according to the operation example 1.
  • a cell close to the source PCell is selected.
  • the radio base station 100 acquires information on peripheral cells (S10).
  • the radio base station 100 may acquire the positions of peripheral cells by using the station placement information of the cells possessed by the operator.
  • the radio base station 100 may acquire information on peripheral cells (which may be read as adjacent cells, neighboring cells, etc.) using the candidate cell list of the handover destination.
  • peripheral cells which may be read as adjacent cells, neighboring cells, etc.
  • Neighbor list (see 3GPP TS38.133) and Neighbor are examples of candidate cell lists for handover destinations.
  • a cell list (see 3GPP TS36.133) or a Neighbor relation table for Neighbor relations may be used.
  • the radio base station 100 may acquire (estimate) the positions of peripheral cells based on the reception quality (RSRP, RSRQ and / or SINR) included in the measurement report (MR).
  • RSRP reception quality
  • RSRQ reception quality
  • SINR SINR
  • the radio base station 100 may estimate the position of the UE 200 using the reference signal (RS) and select a cell close to the source PCell from the position of the UE 200.
  • RS reference signal
  • RTT measurement may be referred to as Multi RTT.
  • the measurement of such a timing difference may be referred to as downlink / uplink (DL / UL) -TDOA (Timing Difference of Arrival).
  • the position of may be estimated.
  • Such measurement of the arrival angle may be referred to as DL-AoD (Angle of departure) or UL-AoA (Angle of arrival).
  • the radio base station 100 selects a cell close to the source PCell by any of the above methods (S20).
  • the radio base station 100 sets the SCG including the selected cell (SCell), and executes the handover of UE200, specifically, HO with PSCell (S30).
  • the radio base station 100 may execute a normal handover instead of the HO with PSCell.
  • FIG. 7 shows a cell selection and handover operation flow of the radio base station 100 according to the operation example 2.
  • the eNB / gNB (cell) with the least traffic is selected.
  • the radio base station 100 acquires information on traffic transmitted and received by peripheral cells (radio base stations) (S110). For example, as described above, the radio base station 100 acquires information such as the transmission power and modulation method of the UE 200 based on the reception quality included in the MR, and calculates the amount of data transmitted and received by each UE 200 from the acquired information. By doing so, the amount of traffic sent and received by each of the peripheral cells can be estimated.
  • the radio base station 100 may estimate the traffic handled in the peripheral cells based on the MR information reported from the UE 200, and select eNB / gNB based on the estimated traffic.
  • the wireless base station 100 selects the peripheral cell (eNB / gNB) that handles the least amount of traffic (S120).
  • the peripheral cell eNB / gNB
  • the radio base station 100 sets the SCG including the selected cell (SCell), and executes the handover of UE200, specifically, HO with PSCell (S130).
  • the radio base station 100 may execute a normal handover instead of the HO with PSCell.
  • FIG. 8 shows a cell selection and handover operation flow of the radio base station 100 according to the operation example 3.
  • eNB / gNB (cell) is selected according to the capability of UE200.
  • the radio base station 100 acquires the capability information (UE Capability Information) of the UE 200 (S210).
  • the capability information may include the number of SCG cells supported by the UE 200 and the frequency band to which the UE 200 can be connected.
  • the number of cells may be an absolute value or a relative value with respect to some reference value.
  • the frequency band may be in FR units or may be a specific band (or band combination) finer than FR.
  • the cell that uses FR2 does not have to be selected as the cell included in the SCG.
  • UE Capability Information may be notified from the source PCell to the target PCell at the time of the handover request (see (0) in FIG. 2).
  • the radio base station 100 selects a cell according to the acquired capability information of the UE 200 (S220).
  • the radio base station 100 sets the SCG including the selected cell (SCell), and executes the handover of UE200, specifically, HO with PSCell (S230).
  • the radio base station 100 may execute a normal handover instead of the HO with PSCell.
  • FIG. 9 shows a cell selection and handover operation flow of the radio base station 100 according to the operation example 4.
  • multiple SCGs are set up, and the optimum SCG (cell) is selected from the set up SCGs.
  • the radio base station 100 sets up a plurality of target SCGs (S310).
  • the radio base station 100 selects one of the SCGs according to the connection state (for example, whether or not synchronization can be established) between any of the cells (may be PSCell) included in the set up SCG and the UE200 (for example, whether or not synchronization can be established). S320).
  • UE200 may try to connect to the cell of the second SCG.
  • the UE 200 may connect to each of the three SCGs so that the SCG in the best condition is selected.
  • connection state may be whether or not synchronization can be established in a predetermined layer (not limited to a specific layer).
  • other parameters such as reception quality may be used alternativeally or additionally, not limited to establishing synchronization.
  • the radio base station 100 sets the selected SCG and executes the UE200 handover, specifically, HO with PSCell (S330).
  • the SCG (cell) is selected by different selection methods, but any two or more of the operation examples may be combined. ..
  • the handover (HO with PSCell) is executed only when the SCGs (cells) selected by all the selection methods match, and if not, the normal handover is executed. You may.
  • the radio base station 100 is estimated to be close to the cell from which the UE 200 is handed over, based on the reception quality (RSRP, etc.) included in the measurement report (MR) received from the UE 200.
  • Peripheral cells can be selected as SCells (may be PSCells) and the SCG containing the selected SCells can be set.
  • the radio base station 100 can also select a peripheral cell presumed to be close to the cell of the handover source as an SCell (may be a PSCell) based on the reception state of the UE 200 and the transmitted and / or received reference signal. ..
  • SCell may be a PSCell
  • the radio base station 100 estimates the traffic volume in the peripheral cell based on the measurement report received from the UE 200, and selects the peripheral cell whose estimated traffic volume is smaller than the specified value as the SCell (may be PSCell). You can also.
  • the radio base station 100 can also select a peripheral cell of the UE200 according to the capability of the UE200 as an SCell (may be a PSCell) based on the capability information (UECapability Information) of the UE200.
  • SCell may be a PSCell
  • UECapability Information the capability information of the UE200.
  • the radio base station 100 can set a plurality of SCGs including SCell (may include PSCell), and select any SCG according to the connection state with the cell of UE200.
  • SCell may include PSCell
  • the wireless communication system 10 supports LTE and NR, but only NR may be supported. Further, the wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution or 6G.
  • dual connectivity to which HO with PSCell is applied is premised, but if the applicable conditions are satisfied, even if the cell (S-le-group) selection method described above is applied to a handover other than HO with PSCell. good.
  • each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
  • the functional block may be realized by combining the software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't.
  • a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • the realization method is not particularly limited.
  • the above-mentioned wireless base station 100 and UE200 may function as a computer that processes the wireless communication method of the present disclosure.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 10, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
  • the word “device” can be read as a circuit, device, unit, etc.
  • the hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.
  • Each functional block of the device (see FIGS. 3 and 4) is realized by any hardware element of the computer device or a combination of the hardware elements.
  • each function in the device is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.
  • predetermined software program
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
  • CPU central processing unit
  • the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
  • a program program code
  • a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done.
  • the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.
  • the storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • Storage 1003 may be referred to as auxiliary storage.
  • the recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.
  • the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.
  • FDD frequency division duplex
  • TDD time division duplex
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • Bus 1007 may be configured using a single bus or may be configured using different buses for each device.
  • the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA).
  • the hardware may implement some or all of each functional block.
  • processor 1001 may be implemented using at least one of these hardware.
  • information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)), other signals or combinations thereof.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)
  • RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.
  • LTE LongTermEvolution
  • LTE-A LTE-Advanced
  • SUPER3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • FutureRadioAccess FAA
  • NewRadio NR
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB UltraMobileBroadband
  • IEEE802.11 Wi-Fi (registered trademark)
  • IEEE802.16 WiMAX®
  • IEEE802.20 Ultra-WideBand
  • Bluetooth® Ultra-WideBand
  • other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them. It may be applied to one.
  • a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node).
  • various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
  • S-GW network node
  • the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information and signals can be output from the upper layer (or lower layer) to the lower layer (or upper layer).
  • Input / output may be performed via a plurality of network nodes.
  • the input / output information may be stored in a specific location (for example, memory) or may be managed using a management table.
  • the input / output information may be overwritten, updated, or added.
  • the output information may be deleted.
  • the entered information may be transmitted to other devices.
  • the determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).
  • the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • the software may use at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to create a website.
  • wired technology coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
  • the radio resource may be indexed.
  • Base Station BS
  • Wireless Base Station Wireless Base Station
  • Fixed Station NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • Access point "transmission point”
  • reception point "transmission / reception point”
  • cell “sector”
  • Cell group “cell group”
  • Terms such as “carrier” and “component carrier” may be used interchangeably.
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • a base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a remote radio for indoor use). Communication services can also be provided by Head: RRH).
  • RRH Remote Radio Head
  • cell refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.
  • MS Mobile Station
  • UE user equipment
  • terminal terminal
  • Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like.
  • the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter).
  • communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect / embodiment of the present disclosure may be applied to the configuration.
  • the mobile station may have the functions of the base station.
  • words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
  • the upstream channel, the downstream channel, and the like may be read as a side channel.
  • the mobile station in the present disclosure may be read as a base station.
  • the base station may have the functions of the mobile station.
  • the radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further be composed of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.
  • the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time area.
  • the slot may be a unit of time based on numerology.
  • the slot may include a plurality of mini slots.
  • Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot.
  • a minislot may consist of a smaller number of symbols than the slot.
  • PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A.
  • the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • Wireless frames, subframes, slots, mini slots and symbols all represent time units when transmitting signals.
  • the radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.
  • one subframe may be referred to as a transmission time interval (TTI)
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI slot or one minislot
  • at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. May be.
  • the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
  • a base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
  • the definition of TTI is not limited to this.
  • TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
  • a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
  • the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12.
  • the number of subcarriers contained in the RB may be determined based on numerology.
  • the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
  • Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
  • One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: REG), PRB pairs, RB pairs, etc. May be called.
  • Physical RB Physical RB: PRB
  • sub-carrier groups Sub-Carrier Group: SCG
  • resource element groups Resource Element Group: REG
  • PRB pairs RB pairs, etc. May be called.
  • the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE).
  • RE resource elements
  • 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
  • Bandwidth Part (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks for a neurology in a carrier. good.
  • the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
  • BWP for UL
  • DL BWP BWP for DL
  • One or more BWPs may be set in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • the above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples.
  • the number of subframes contained in a radio frame the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB.
  • the number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
  • connection means any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two “connected” or “joined” elements.
  • the connection or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • the two elements use at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-comprehensive examples, the radio frequency region.
  • Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions, etc. can be considered to be “connected” or “coupled” to each other.
  • the reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.
  • RS Reference Signal
  • Pilot pilot
  • each of the above devices may be replaced with a "part”, a “circuit”, a “device”, or the like.
  • references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.
  • determining and “determining” used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as “judgment” or “decision”.
  • judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as “judgment” or “decision”.
  • judgment and “decision” are considered to be “judgment” and “decision” when the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming", “expecting”, “considering” and the like.
  • the term "A and B are different” may mean “A and B are different from each other”.
  • the term may mean that "A and B are different from C”.
  • Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
  • Wireless communication system 20 RAN 100 Wireless base station 110 Wireless communication unit 120 Measurement report processing unit 130 Control signal / reference signal processing unit 140 Control unit 200 UE 210 Wireless communication unit 220 Control signal / reference signal processing unit 230 Quality measurement unit 240 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

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Abstract

Cette station de base sans fil reçoit d'un terminal un rapport de mesure comprenant une qualité de réception pour une cellule périphérique du terminal. Pendant un transfert intercellulaire à l'aide de cellules secondaires primaires, la station de base sans fil sélectionne, comme cellule secondaire, une cellule périphérique estimée être proche de la cellule source de transfert intercellulaire sur la base de la qualité de réception, et définit un groupe de cellules secondaires comprenant les cellules secondaires primaires.
PCT/JP2020/048921 2020-12-25 2020-12-25 Station de base sans fil WO2022137554A1 (fr)

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Citations (2)

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JP2016201582A (ja) * 2015-04-07 2016-12-01 株式会社日立製作所 無線通信システム、基地局、及び、通信制御方法
JP2017046110A (ja) * 2015-08-25 2017-03-02 株式会社日立製作所 無線通信システム、基地局制御装置、及び基地局

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JP2016201582A (ja) * 2015-04-07 2016-12-01 株式会社日立製作所 無線通信システム、基地局、及び、通信制御方法
JP2017046110A (ja) * 2015-08-25 2017-03-02 株式会社日立製作所 無線通信システム、基地局制御装置、及び基地局

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