WO2021028995A1 - Terminal - Google Patents

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Publication number
WO2021028995A1
WO2021028995A1 PCT/JP2019/031751 JP2019031751W WO2021028995A1 WO 2021028995 A1 WO2021028995 A1 WO 2021028995A1 JP 2019031751 W JP2019031751 W JP 2019031751W WO 2021028995 A1 WO2021028995 A1 WO 2021028995A1
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WIPO (PCT)
Prior art keywords
transition
cell
conditional
cho
base station
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PCT/JP2019/031751
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English (en)
Japanese (ja)
Inventor
直也 村田
明人 花木
徹 内野
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株式会社Ｎｔｔドコモ
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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/JP2019/031751 priority Critical patent/WO2021028995A1/fr
Priority to JP2021539728A priority patent/JPWO2021028995A1/ja
Publication of WO2021028995A1 publication Critical patent/WO2021028995A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions

Definitions

  • the present invention relates to a terminal that executes wireless communication, particularly a terminal that executes cell transition without waiting for a transition command.
  • LTE Long Term Evolution
  • NR New Radio
  • NG Next Generation
  • a network sets a target radio base station (also called a target cell) based on quality information such as a measurement report transmitted from a terminal (User Equipment, UE). After the decision is made and the handover is prepared, the handover command (transition command) is transmitted to the terminal.
  • a target radio base station also called a target cell
  • quality information such as a measurement report transmitted from a terminal (User Equipment, UE).
  • the terminal passes an appropriate handover point while preparing for the handover on the network side, it transitions to the target radio base station without receiving the handover command from the source radio base station (also called the source cell). Therefore, there is a problem that a momentary interruption of the wireless link may occur.
  • the source radio base station also called the source cell
  • Conditional HO conditional cell transition
  • Conditional HO for the candidate cell may be suppressed for some reason.
  • the candidate cell gNB
  • PUCCH Physical Uplink Control Channel
  • the network individually instructs the terminal in which the candidate cell is set to exclude the candidate cell by signaling of the upper layer (for example, the radio resource control layer (RRC)), the signal of the control plane is signaled.
  • the upper layer for example, the radio resource control layer (RRC)
  • RRC radio resource control layer
  • the present invention has been made in view of such a situation, and provides a terminal capable of easily setting and excluding candidate cells for conditional cell transition such as Conditional HO while avoiding an increase in signal amount.
  • the purpose is a terminal capable of easily setting and excluding candidate cells for conditional cell transition such as Conditional HO while avoiding an increase in signal amount.
  • One aspect of the present disclosure is a receiving unit (conditional transition processing unit 230) that receives setting information of a transition destination cell by a conditional cell transition (for example, Conditional HO), and a transition command is waited based on the setting information. It is provided with a control unit (transition control unit 250) that executes a cell transition according to the conditional cell transition without having to receive the cancellation of the transition destination cell (for example, CHO cancel) by common signaling. , The control unit is a terminal (UE200) that excludes the transition destination cell based on the cancellation.
  • a conditional cell transition for example, Conditional HO
  • control unit 250 that executes a cell transition according to the conditional cell transition without having to receive the cancellation of the transition destination cell (for example, CHO cancel) by common signaling.
  • the control unit is a terminal (UE200) that excludes the transition destination cell based on the cancellation.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a functional block configuration diagram of the UE 200.
  • FIG. 3 is an explanatory diagram of a conventional handover procedure.
  • FIG. 4 is an explanatory diagram of the handover procedure by Conditional HO.
  • FIG. 5 is a diagram showing a basic sequence in Conditional HO.
  • FIG. 6 is a diagram showing a conditional HO sequence (No. 1) including exclusion of candidate cells.
  • FIG. 7 is a diagram showing a conditional HO sequence (No. 2) including exclusion of candidate cells.
  • FIG. 8 is a diagram showing a sequence of Conditional SCG Connection (No. 1) including exclusion of candidate cells.
  • FIG. 9 is a diagram showing a sequence of Conditional SCG Connection (No. 2) including exclusion of candidate cells.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the UE 200.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment.
  • the radio communication system 10 is a radio communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network (NG-RAN) and a user terminal 200 (User Equipment 200, hereinafter, UE200) (not shown).
  • NR 5G New Radio
  • NG-RAN Next Generation-Radio Access Network
  • UE200 User Equipment 200
  • NG-RAN includes radio base station 100A (hereinafter, gNB100A) to radio base station 100C (hereinafter, gNB100C).
  • gNB100A radio base station 100A
  • gNB100C radio base station 100C
  • the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.
  • NG-RAN actually includes multiple NG-RAN Nodes, specifically gNB (or ng-eNB), and is connected to a core network (5GC, not shown) according to 5G.
  • NG-RAN and 5GC may be simply expressed as a network.
  • GNB100A to gNB100C are radio base stations that comply with 5G, and execute wireless communication according to UE200 and 5G.
  • gNB100A to gNB100C and UE200 are Massive MIMO that generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation (CA) that uses multiple component carriers (CC) in a bundle. ), And dual connectivity (DC) that communicates between the UE and multiple NG-RAN Nodes at the same time.
  • Massive MIMO that generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements
  • CA carrier aggregation
  • CC component carriers
  • DC dual connectivity
  • GNB100A to gNB100C each form one or more cells.
  • the UE200 can transition between cells (which may be called radio base stations) formed by gNB100A to gNB100C. “Transition” typically means a handover between cells (radio base stations), but the behavior of the UE 200 (behavior) such that the cell (radio base station) to be connected to is changed, such as cell reselection. ) Can be included.
  • the transition destination cell (radio base station) to which the UE200 transitions is called the target cell or target radio base station.
  • the transition source cell (radio base station) is called a source cell or a source radio base station.
  • the UE 200 can execute the handover (cell transition) according to the conditional handover (Conditional HO) without waiting for the handover command (transition command).
  • FIG. 2 is a functional block configuration diagram of UE200.
  • the UE 200 includes a wireless transmission unit 210, a wireless reception unit 220, a conditional transition processing unit 230, a common signaling processing unit 240, and a transition control unit 250.
  • the wireless transmitter 210 transmits an uplink signal (UL signal) according to NR.
  • the wireless receiver 220 receives the downlink signal (DL signal) according to the NR.
  • the wireless transmission unit 210 and the wireless reception unit 220 execute wireless communication via a control channel or a data channel.
  • Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), Physical Broadcast Channel (PBCH), and the like.
  • PDCCH Physical Downlink Control Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • PBCH Physical Broadcast Channel
  • the data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Downlink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Downlink Shared Channel
  • the conditional transition processing unit 230 executes the processing related to the conditional transition (conditional cell transition) between the cells of the UE 200.
  • the conditional transition processing unit 230 executes a conditional handover different from the normal handover, specifically, a process related to the above-mentioned Conditional HO (hereinafter, appropriately abbreviated as CHO).
  • the conditional transition processing unit 230 receives the CHO setting information from the source cell.
  • the CHO setting information is the information included in the CHO setup transmitted by the source cell.
  • the CHO setup may include a candidate cell that is a candidate for a transition destination cell by CHO, a transition condition to the candidate cell, and the like.
  • conditional transition processing unit 230 constitutes a receiving unit that receives the setting information of the transition destination cell by the conditional handover.
  • conditional transition processing unit 230 receives the cancellation of the transition destination cell based on the content of the common signaling received by the common signaling processing unit 240. That is, the conditional transition processing unit 230 receives the cancellation of the transition destination cell by common signaling. Note that "cancellation of transition destination cell” may be interpreted as cancellation or suspension.
  • conditional transition processing unit 230 receives the cancellation of the transition destination cell by common signaling in the physical layer (also called PHY or L1) or the medium access control layer (MAC). More specifically, the conditional transition processing unit 230 receives the CHO cancel from the network.
  • PHY physical layer
  • MAC medium access control layer
  • conditional transition processing unit 230 can receive a cell list (which may be called a blacklist) indicating cells for which the transition of UE200 is prohibited.
  • the conditional transition processing unit 230 may receive a cell list (which may be called a white list) showing cells that are allowed to transition to the UE 200.
  • the common signaling processing unit 240 executes processing related to common signaling that is not individual to UE200 (Non-UE specific). Specifically, the common signaling processing unit 240 executes processing related to signaling common to a plurality of terminals such as PHY (L1) or MAC, instead of signaling individual terminals such as the radio resource control layer (RRC).
  • PHY PHY
  • RRC radio resource control layer
  • the common signaling processing unit 240 executes processing related to signaling using the downlink control information (DCI), MAC-CE (Control Element) or MAC-PDU (Protocol Data Unit) of L1.
  • DCI downlink control information
  • MAC-CE Control Element
  • MAC-PDU Protocol Data Unit
  • the transition control unit 250 executes control related to the transition of the UE 200.
  • the transition control unit 250 is based on the setting information of the transition destination cell by the CHO, and the cell transition according to the CHO without waiting for the handover command (which may be called a transition command), specifically, the cell transition according to the CHO. , Perform handover.
  • the transition control unit 250 constitutes a control unit.
  • transition control unit 250 excludes the transition destination cell based on the cancellation (CHO cancel) of the transition destination cell received by the conditional transition processing unit 230.
  • the transition control unit 250 excludes the transition destination cell by CHO held inside the UE 200 based on CHO cancel. Note that "excluding the transition destination cell” may mean deleting the holding transition destination cell or simply excluding it from the target of CHO (permanent or temporary).
  • the transition control unit 250 may delete the transition destination cell or suspend the transition to the transition destination cell based on CHO cancel.
  • the transition control unit 250 receives a cell list (blacklist) indicating cells for which the transition of UE200 is prohibited, and if the cell list includes a transition destination cell by CHO, the cell is concerned.
  • the transition destination cell included in the list may be excluded from the candidate cells of the transition destination cell by CHO.
  • the transition control unit 250 when the transition control unit 250 receives the cell list (white list) indicating the cells to which the transition of UE200 is permitted, the transition destination cell not included in the cell list is transitioned by CHO. It may be excluded from the candidate cells of the previous cell.
  • FIG. 3 is an explanatory diagram of a conventional handover procedure
  • FIG. 4 is an explanatory diagram of a handover procedure by Conditional HO.
  • the network is based on quality information ((1) in the figure) such as a measurement report (Measurement Report) transmitted from the terminal (User Equipment, UE). Then, the target radio base station (T-gNB) is determined, and the handover command is transmitted to the terminal ((3) in the figure) after the preparation for the handover ((2) in the figure).
  • quality information (1) in the figure
  • UE User Equipment
  • T-gNB target radio base station
  • the terminal passes an appropriate handover point while preparing for the handover on the network side, it transitions to the target radio base station without receiving the handover command from the source radio base station (S-gNB) ( (4) in the figure) may occur (may be called "too late HO"). Therefore, the terminal cannot recognize the setting related to the target radio base station, and the radio link may be interrupted momentarily.
  • S-gNB source radio base station
  • CHO Conditional HO
  • a candidate cell for handover and a transition condition to the candidate cell are set in advance for the terminal.
  • the terminal can connect to the target radio base station without waiting for an instruction (handover command) from the network, and can avoid a momentary interruption of the radio link.
  • preparations for handover are executed in advance between the source radio base station (S-gNB) and the target radio base station (T-gNB) ((1) in the figure).
  • the CHO setting contents including the transition condition to the target radio base station are notified to the terminal ((2) in the figure).
  • the terminal decides to connect to the target radio base station by moving or the like, the terminal starts the RA procedure with the target radio base station based on the CHO setting contents ((3) in the figure).
  • the "handover command” may be called reconfigurationWithSync in NR and RRC connection reconfiguration (including mobilitycontrolinfo) in LTE.
  • Figure 5 shows the basic sequence in Conditional HO.
  • the gNB100A source cell
  • the gNB100B and gNB100C which are candidate cells that are candidates for the transition destination cell by CHO.
  • gNB100B and gNB100C candidate cells that are candidates for the transition destination cell by CHO.
  • gNB100B and gNB100C candidate cells return acknowledge, which is an acknowledgment to the received HO request.
  • gNB100B and gNB100C are set as candidate cells by CHO of UE200.
  • GNB100A sends CHOsetup to UE200 after the setting of candidate cells is completed.
  • UE200 executes the CHO setting based on CHOsetup, and returns CHOsetup complete to gNB100A after the setting is completed.
  • the UE 200 can execute the CHO to the candidate cell, and when the trigger condition of the CHO is satisfied, the UE 200 executes the handover procedure to the candidate cell according to the CHO.
  • the candidate cell (gNB)
  • the candidate cell may be deleted from the transition destination cell by CHO.
  • FIG. 6 shows a sequence of Conditional HO (No. 1) including exclusion of candidate cells. As shown in FIG. 6, up to CHOsetup, the conditional HO shown in FIG. 5 is the same as the basic sequence.
  • gNB100A source cell
  • the gNB100A recognized in this way sends a CHO cancel to the UE200.
  • CHO cancel indicates that gNB100B is excluded from CHO candidate cells.
  • the UE200 excludes gNB100B from CHO candidate cells based on CHO cancel. After that, the UE 200 can execute CHO to the candidate cell (gNB100C only), and when the trigger condition of CHO is satisfied, the UE 200 executes the handover procedure to the candidate cell (gNB100C) according to CHO.
  • the UE 200 does not execute CHO but executes the conventional handover procedure when executing the handover to the excluded cell.
  • FIG. 7 shows the Conditional HO sequence (No. 2) including the exclusion of candidate cells.
  • the difference from the sequence shown in FIG. 6 is that the gNB100A receives the status from the gNB100B after receiving the CHOsetup complete from the UE200, and recognizes that the gNB100B should be excluded from the candidate cells. In this case as well, gNB100A transmits CHO cancel to UE200.
  • CHO cancel is notified by common signaling to a plurality of terminals. Specifically, CHOcancel is notified to a plurality of terminals at once using DCI, MAC-CE or MAC-PDU.
  • the designation of the CHO candidate cell by CHO cancel may be realized by any of the following parameters or a combination of a plurality of parameters.
  • the notification of CHO cancel by the common signaling may be set to a plurality of terminals in advance that the notification is given by the network.
  • the setting may be executed by using SIB (System Information Block) or by signaling of a higher layer such as RRC.
  • the following action / effect can be obtained.
  • the UE 200 receives from the network (gNB100A) the cancellation of the transition destination cell by CHO (CHO cancel) by common signaling.
  • CHO CHO cancel
  • UE200 excludes the transition destination cell based on the reception of CHO cancel.
  • Conditional HO may be suppressed for some reason, but according to this embodiment, PHY or PHY or not individual signaling such as RRC Since the CHO cancel is notified to a plurality of terminals at once using the common signaling of the MAC layer, it is possible to avoid an increase in the signal amount of the control plane.
  • the candidate cells of Conditional HO can be easily set and excluded while avoiding the increase in the number.
  • the UE200 can exclude the transition destination cells included in the cell list (blacklist) in which the cells for which the transition of the UE200 is prohibited are shown from the candidate cells of the transition destination cells by CHO. Therefore, the candidate cell of the transition destination cell by CHO can be flexibly specified by using the cell list.
  • CHO cancel is notified using the common signaling of the PHY or MAC layer. Therefore, it is possible to efficiently and surely notify the cancellation of the transition destination cell by CHO by utilizing the common signaling of the existing lower layer.
  • the UE 200 can delete the holding transition destination cell or suspend the transition to the transition destination cell based on CHO cancel. Therefore, it is possible to flexibly handle the information of the transition destination cell by the CHO held by the UE 200, and if the transition destination cell is not deleted and the transition to the transition destination cell is simply suspended, the relevant case occurs. It is also possible to reuse the setting information of the transition destination cell.
  • CSC Conditional SCG Connection
  • Conditional SCG Connection is described in, for example, R2-1903677 (3GPP TSG-RAN WG2 # 105bis, Xi'an, China, April 8-12, 2019) to 3GPP.
  • Conditional SCG Connection may be called Conditional PSCell addition or the like.
  • FIG. 8 shows a sequence of Conditional SCG Connection (No. 1) including exclusion of candidate cells.
  • FIG. 8 corresponds to the Conditional HO sequence (No. 1) including the exclusion of the candidate cells shown in FIG.
  • the parts that differ from Conditional HO will be mainly explained below.
  • gNB100A transmits CSC cancel to UE200.
  • CSC cancel indicates that gNB100B is excluded from the CSC candidate cells.
  • UE200 excludes gNB100B from CHO candidate cells based on CSC cancel. Others are the same as the Conditional HO sequence (No. 1) including the exclusion of candidate cells shown in FIG.
  • FIG. 9 shows a sequence of Conditional SCG Connection (No. 2) including exclusion of candidate cells.
  • FIG. 9 corresponds to the Conditional HO sequence (No. 2) including the exclusion of the candidate cells shown in FIG.
  • gNB100A receives status from gNB100B and recognizes that gNB100B should be excluded from the candidate cells.
  • Others are the same as the Conditional HO sequence (No. 1) including the exclusion of candidate cells shown in FIG.
  • Conditional SCG Connection may be interpreted as a kind of conditional handover as well as Conditional HO.
  • the conditional handover may be read as a conditional cell transition or a conditional cell addition.
  • 5G 5G
  • Conditional HO and Conditional SCG Connection may be applied to LTE.
  • each functional block is realized by any combination of at least one of hardware and software.
  • the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , 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 only these.
  • a functional block that makes transmission function is called a transmitting unit or a transmitter.
  • the method of realizing each is not particularly limited.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the UE 200.
  • the UE 200 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 the devices shown in the figure, or may be configured not to include some of the devices.
  • Each functional block of UE200 (see FIG. 2) is realized by any hardware element of the computer device or a combination of the hardware elements.
  • each function in the UE 200 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 to control the communication by the communication device 1004 and the memory 1002. And by controlling at least one of reading and writing of data in the storage 1003.
  • predetermined software program
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be composed of 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 called 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 a 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.
  • Communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. 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, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts 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).
  • each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
  • the bus 1007 may be configured by using a single bus, or may be configured by using a different bus 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 (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), upper layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or combinations thereof.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling may also be referred to as an RRC message, for example, 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 UltraMobile Broadband
  • IEEE802.11 Wi-Fi (registered trademark)
  • IEEE802.16 WiMAX®
  • IEEE802.20 Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next generation systems extended based on them.
  • 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 the present disclosure may be performed by its upper node (upper node).
  • various operations performed for communication with a terminal are performed by the base station and other network nodes other than the base station (for example, 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 can be overwritten, updated, or added.
  • the output information may be deleted.
  • the input information may be transmitted to another device.
  • 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 is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name.
  • Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
  • 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 absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
  • the radio resource may be one indicated by an index.
  • Base Station BS
  • Wireless Base Station Wireless Base Station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • the base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).
  • a base station subsystem eg, a small indoor base station (Remote Radio)
  • Communication services can also be provided by Head: RRH).
  • 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 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, depending on the trader. 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, the 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 applies 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 function of the base station.
  • words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
  • the uplink, downlink, and the like may be read as side channels.
  • 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 consist of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that is independent of 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 (TTI), number of symbols per TTI, wireless frame configuration, transmission / reception.
  • SCS SubCarrier Spacing
  • TTI transmission time interval
  • 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 may be indicated.
  • the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiple Access (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. Slots may be unit of time based on numerology.
  • OFDM Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called 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.
  • PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • the wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal.
  • the radio frame, subframe, slot, minislot and symbol may have 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 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. It 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.
  • the base station schedules each user terminal to allocate wireless 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.
  • the 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.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
  • long TTIs eg, normal TTIs, subframes, etc.
  • short TTIs eg, shortened TTIs, etc.
  • TTI length the TTI length of long TTIs and 1 ms. It may be read as a TTI having the above TTI length.
  • a resource block 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 the RB may be the same regardless of the 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 include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, etc. May be called.
  • Physical RB Physical RB: PRB
  • Sub-Carrier Group: SCG sub-carrier Group: SCG
  • REG resource element group
  • PRB pair an RB pair, 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, etc.) may also represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier.
  • RBs common resource blocks
  • 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 wireless frame the number of slots per subframe or wireless frame, 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, 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 “combined” 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 domain.
  • Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions 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 applicable standard.
  • RS Reference Signal
  • Pilot pilot
  • references to elements using designations such as “first”, “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. Thus, 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. (Accessing) (for example, accessing data in memory) may be regarded as “judgment” or “decision”.
  • judgment and “decision” mean that “resolving”, “selecting”, “choosing”, “establishing”, “comparing”, etc. are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include that some action is regarded 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 100A-100C gNB 200 UE 210 Wireless transmitter 220 Wireless receiver 230 Conditional transition processing unit 240 Common signaling processing unit 250 Transition control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un équipement utilisateur (UE) (200) reçoit une information de réglage d'une cellule de destination de transition par transfert intercellulaire conditionnel. L'équipement utilisateur (200) exécute, sur la base de l'information de réglage, une transition de cellule qui est conforme au transfert intercellulaire conditionnel sans attendre une commande de transition. L'équipement utilisateur (200) reçoit une annulation de la cellule de destination de transition (annulation de transfert intercellulaire) par signalisation partagée, et exclut la cellule de destination de transition sur la base de l'annulation.
PCT/JP2019/031751 2019-08-09 2019-08-09 Terminal WO2021028995A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016130062A1 (fr) * 2015-02-13 2016-08-18 Telefonaktiebolaget Lm Ericsson (Publ) Préparation précode de transfert dans un réseau de communication sans fil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016130062A1 (fr) * 2015-02-13 2016-08-18 Telefonaktiebolaget Lm Ericsson (Publ) Préparation précode de transfert dans un réseau de communication sans fil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Configuration of Conditional handover in NR", #GPP TSG RAN WG2 #106 R2-1906210, 17 May 2019 (2019-05-17), pages 1 - 5, XP051710520 *

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