WO2022085158A1 - Terminal et station de base sans fil - Google Patents

Terminal et station de base sans fil Download PDF

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Publication number
WO2022085158A1
WO2022085158A1 PCT/JP2020/039747 JP2020039747W WO2022085158A1 WO 2022085158 A1 WO2022085158 A1 WO 2022085158A1 JP 2020039747 W JP2020039747 W JP 2020039747W WO 2022085158 A1 WO2022085158 A1 WO 2022085158A1
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Prior art keywords
secondary cell
addition
information
procedure
failure information
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PCT/JP2020/039747
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English (en)
Japanese (ja)
Inventor
天楊 閔
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株式会社Ｎｔｔドコモ
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Priority to JP2022556333A priority Critical patent/JPWO2022085158A1/ja
Priority to PCT/JP2020/039747 priority patent/WO2022085158A1/fr
Publication of WO2022085158A1 publication Critical patent/WO2022085158A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • This disclosure relates to terminals and radio base stations that support the procedure for adding / changing secondary cells (secondary nodes).
  • 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
  • Non-Patent Document 1 For example, in 3GPP Release-17, expansion of Multi-RAT Dual Connectivity (MR-DC) is being considered (Non-Patent Document 1). Specifically, in order to realize more efficient addition or change of Primary SCell (PSCell), the procedure for adding / changing a conditional secondary cell (secondary node) (conditional PSCell addition / change) has been simplified. Support is being considered.
  • PSCell Primary SCell
  • Non-Patent Document 2 SN-Patent Document 2
  • the UE when the UE selects another candidate secondary cell, it cannot be linked with the master node (MN) or the like, and another candidate secondary cell cannot be efficiently selected.
  • MN master node
  • the following disclosure was made in view of such a situation, and provides terminals and radio base stations that can reduce secondary node change failures and realize more efficient conditional PSCell addition / change. The purpose.
  • One aspect of the present disclosure is to identify a control unit (control unit 240) that controls execution of a secondary cell addition / modification procedure, and a secondary cell in which the addition / modification procedure fails when the addition / modification procedure fails.
  • It is a terminal (UE200) including a transmission unit (RRC processing unit 220) for transmitting information and quality information between a serving cell and a neighboring cell.
  • RRC processing unit 220 for transmitting information and quality information between a serving cell and a neighboring cell.
  • RRC processing unit 120 that receives failure information of a secondary cell group related to a procedure for adding / changing a secondary cell by a terminal (UE200), and a secondary that fails when the failure information is received. It is a radio base station (for example, eNB100A) including a control unit (control unit 140) that starts data transfer related to the terminal to another candidate secondary cell other than the cell.
  • a radio base station for example, eNB100A
  • control unit 140 that starts data transfer related to the terminal to another candidate secondary cell other than the cell.
  • control unit 240 that controls execution of a secondary cell addition / modification procedure, a transmission unit that transmits failure information of the secondary cell group related to the addition / modification procedure, and a (RRC processing unit). 220), the control unit is a terminal (UE200) that executes a random access procedure for another selected secondary cell before transmitting the failure information when the addition / modification procedure fails.
  • UE200 terminal
  • RRC processing unit 120 receives failure information of a secondary cell group related to a procedure for adding / changing a secondary cell by a terminal (UE200), and a random operation by the terminal based on the failure information.
  • a radio base station eg, eNB100A
  • control unit 140 control unit 140
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a functional block configuration diagram of the eNB 100A.
  • FIG. 3 is a functional block configuration diagram of the UE 200.
  • FIG. 4 is a diagram showing an example of a communication sequence according to a conventional conditional PSCell addition procedure (conditional PSCell addition).
  • FIG. 5 is a diagram showing an example of a communication sequence according to a conventional conditional PSCell change procedure (conditional PSCell change).
  • FIG. 6 is a diagram showing an example of a communication sequence according to the conditional PSCell addition procedure (conditional PSCell addition) according to the operation example 1.
  • FIG. 7 is a diagram showing a communication sequence example (No. 1) according to the conditional PSCell addition procedure (conditional PSCell addition) according to the operation example 2.
  • FIG. 8 is a diagram showing a communication sequence example (No. 2) according to the conditional PSCell addition procedure (conditional PSCell addition) according to the operation example 2.
  • FIG. 9 is a diagram showing an example of the hardware configuration of the eNB 100A, gNB 100B, and 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 New Radio
  • the wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution or 6G.
  • LTE and NR may be interpreted as radio access technology (RAT), and in this embodiment, LTE may be referred to as a first radio access technology and NR may be referred to as a second radio access technology.
  • RAT radio access technology
  • the wireless communication system 10 includes Evolved Universal Terrestrial Radio Access Network 20 (hereinafter, E-UTRAN20) and Next Generation-Radio Access Network 30 (hereinafter, NG RAN30). Further, the wireless communication system 10 includes a terminal 200 (hereinafter, UE200, User Equipment).
  • E-UTRAN20 Evolved Universal Terrestrial Radio Access Network 20
  • NG RAN30 Next Generation-Radio Access Network 30
  • UE200 User Equipment
  • E-UTRAN20 includes eNB100A, which is a wireless base station that complies with LTE.
  • NG RAN30 includes gNB100B, which is a radio base station according to 5G (NR).
  • UPF40 UserPlaneFunction40
  • the E-UTRAN20 and NGRAN30 may be eNB100A or gNB100B) may be simply referred to as a network.
  • the eNB100A, gNB100B and UE200 can support carrier aggregation (CA) using multiple component carriers (CC), and dual connectivity in which component carriers are simultaneously transmitted between multiple NG-RAN Nodes and UEs. ..
  • CA carrier aggregation
  • CC component carriers
  • dual connectivity in which component carriers are simultaneously transmitted between multiple NG-RAN Nodes and UEs. ..
  • the eNB100A, gNB100B and UE200 execute wireless communication via a wireless bearer, specifically, a Signaling Radio Bearer (SRB) or a DRB Data Radio Bearer (DRB).
  • SRB Signaling Radio Bearer
  • DRB DRB Data Radio Bearer
  • the eNB 100A constitutes a master node (MN) and the gNB100B constitutes a secondary node (SN).
  • Multi-Radio Dual Connectivity MR-DC
  • E-UTRA-NR Dual Connectivity EN-DC
  • NE-DC NR-E-UTRA Dual Connectivity
  • gNB100B constitutes MN
  • eNB100A constitutes SN
  • NR-DC NR-NR Dual Connectivity
  • UE200 supports dual connectivity to connect to eNB100A and gNB100B.
  • ENB100A is included in the master cell group (MCG), and gNB100B is included in the secondary cell group (SCG). That is, gNB100B is an SN contained in SCG.
  • the eNB 100A and gNB 100B may be referred to as a radio base station or a network device.
  • conditional addition or change (conditional PSCell addition / change) of Primary SCell may be supported.
  • PSCell is a kind of secondary cell.
  • PSCell means Primary SCell, and may be interpreted as corresponding to any SCell among a plurality of SCells.
  • the secondary cell may be read as a secondary node (SN) or a secondary cell group (SCG).
  • SN secondary node
  • SCG secondary cell group
  • Conditional PSCell addition / change can enable efficient and rapid addition or modification of secondary cells.
  • Conditional PSCell addition / change may be interpreted as a procedure for adding / changing a conditional secondary cell with a simplified procedure. Further, conditionalPSCell addition / change may mean at least one of addition (addition) and change (change) of SCell.
  • the wireless communication system 10 may support the conditional PSCell change procedure between SNs. Specifically, MN-led conditional inter-SN PSCell change and / or SN-led SN-initiated conditional inter-SN PSCell change may be supported.
  • FIG. 2 is a functional block configuration diagram of the eNB 100A.
  • the eNB 100A includes a wireless communication unit 110, an RRC processing unit 120, a DC processing unit 130, and a control unit 140.
  • the gNB100B may also have the same function as the eNB100A, except that it supports NR.
  • the wireless communication unit 110 transmits a downlink signal (DL signal) according to LTE. Further, the wireless communication unit 110 receives the uplink signal (UL signal) according to LTE.
  • DL signal downlink signal
  • UL signal uplink signal
  • the RRC processing unit 120 executes various processes in the radio resource control layer (RRC). Specifically, the RRC processing unit 120 can transmit the RRC Reconfiguration to the UE 200. Further, the RRC processing unit 120 can receive the RRC Reconfiguration Complete, which is a response to the RRC Reconfiguration, from the UE 200.
  • RRC radio resource control layer
  • the eNB 100A supports LTE, but in this case, the name of the RRC message may be RRCConnectionReconfiguration or RRCConnectionReconfigurationComplete.
  • the RRC processing unit 120 can receive SCG failure information regarding conditional PSCell addition / change by UE200.
  • the RRC processing unit 120 constitutes a receiving unit that receives failure information of the secondary cell group regarding the procedure for adding / changing the secondary cell by the terminal.
  • the SCG failure information may include any of the following information.
  • the identification information of the target PSCell is not PCI / CGI, but information that can identify the PSCell (gNB ID). May be called) may be used. Further, two or more pieces of information on the identification information of the PSCell for which conditional PSCell addition / change has failed may be included.
  • PCI Physical Cell ID
  • CGI NR Cell Global Identifier
  • the quality information may be, for example, the quality (for example, Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ)) included in the measurement report (Measurement Report) specified in 3GPP TS38.331.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the RACH information may be, for example, any of the following information specified in 3GPP TS38.331.
  • RA-InformationCommon-r16 -2-step RACH info (msgA-SubcarrierSpacing, msgA-RO-FrequencyStart, msgA-RO-FDM, ssb-Index, CSIRS-index, numberOfPreamblesSentOnSSB, numberOfPreamblesSentOnCSI-RS, contentionDetected or not, dlRSRPAboveThreshold
  • the DC processing unit 130 executes processing related to dual connectivity, specifically, Multi-RAT Dual Connectivity (MR-DC).
  • MR-DC Multi-RAT Dual Connectivity
  • the DC processing unit 130 may execute processing related to E-UTRA-NR Dual Connectivity (EN-DC).
  • EN-DC E-UTRA-NR Dual Connectivity
  • the type of DC is not limited, and for example, NR-E-UTRA Dual Connectivity (NE-DC) or NR-NR Dual Connectivity (NR-DC) may be supported.
  • the DC processing unit 130 can send and receive messages specified in 3GPP TS37.340 and execute processing related to DC setting and release between eNB100A, gNB100B and UE200.
  • the control unit 140 controls each functional block constituting the eNB 100A. In particular, in the present embodiment, control regarding the addition or modification of the secondary node is executed.
  • control unit 140 can determine whether or not to execute conditional PSCell addition / change (CPA / CPC) based on the measurement report (Measurement Report) from the UE 200.
  • control unit 140 may send an SN Addition Request to the target secondary node (T-SN). Further, the control unit 140 may receive the SN Addition Request Ack, which is a response to the SN Addition Request, from the T-SN.
  • T-SN target secondary node
  • control unit 140 receives not only the CPA / CPC but also the SN change required from the S-SN when the source / secondary node (S-SN) determines the SN-initiated conditional inter-SN PSCell change (CPC). You may. Further, the control unit 140 may send an SN Addition Request to the T-SN in response to the SN change required.
  • S-SN source / secondary node
  • CPC SN-initiated conditional inter-SN PSCell change
  • the channel includes a control channel and a data channel.
  • the control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), PBCH (Physical Broadcast Channel) and the like.
  • the data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Uplink Shared Channel
  • the reference signal includes Demodulation reference signal (DMRS), Sounding Reference Signal (SRS), Phase Tracking Reference Signal (PTRS), Channel State Information-Reference Signal (CSI-RS), and the like. Includes channels and reference signals. Further, the data may mean data transmitted via a data channel.
  • DMRS Demodulation reference signal
  • SRS Sounding Reference Signal
  • PTRS Phase Tracking Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the control unit 140 transfers data related to the UE 200 to another candidate PSCell (candidate secondary cell) other than the failed PSCell (secondary cell). You may start.
  • control unit 140 may immediately start data forwarding regarding the UE 200 to the SN forming the candidate PS Cell as soon as the SCG failure information is received, or a predetermined time after receiving the SCG failure information.
  • the data transfer may be started within.
  • the data transfer relating to the UE 200 may be uplink (UL) data from the UE 200 or downlink (DL) data to the UE 200.
  • control unit 140 transfers data related to the UE 200 to another candidate PS Cell (candidate secondary cell) in which the random access procedure (RA procedure) by the UE 200 is successful, based on the received SCG failure information (failure information). You may start.
  • control unit 140 implied based on the identification information of the target PSCell that succeeded in the RA procedure (which may be interpreted as RACH transmission) accompanying the conditional PSCell addition / change included in the SCG failure information.
  • Data transfer related to the UE 200 may be started intentionally (or explicitly).
  • FIG. 3 is a functional block configuration diagram of the UE 200.
  • the UE 200 includes a wireless communication unit 210, an RRC processing unit 220, a DC processing unit 230, and a control unit 240.
  • the wireless communication unit 210 transmits an uplink signal (UL signal) according to LTE or NR. Further, the wireless communication unit 210 receives the downlink signal (DL signal) according to LTE. That is, the UE200 can access the eNB100A (E-UTRAN20) and gNB100B (NGRAN30), and can support dual connectivity (specifically, EN-DC).
  • UL signal uplink signal
  • NR NR
  • DL signal downlink signal
  • the UE200 can access the eNB100A (E-UTRAN20) and gNB100B (NGRAN30), and can support dual connectivity (specifically, EN-DC).
  • the RRC processing unit 220 executes various processes in the radio resource control layer (RRC). Specifically, the RRC processing unit 220 can send and receive messages of the radio resource control layer.
  • RRC radio resource control layer
  • the RRC processing unit 220 can receive the RRC Reconfiguration from the network, specifically, E-UTRAN20 (or NGRAN30). Further, the RRC processing unit 220 can transmit the RRC Reconfiguration Complete, which is a response to the RRC Reconfiguration, to the network.
  • the RRC processing unit 220 can transmit the identification information of the target PSCell (secondary cell) in which the conditional PSCell addition / change fails, and the quality information between the serving cell and the neighboring cell.
  • the RRC processing unit 220 constitutes a transmission unit that transmits identification information and quality information.
  • the identification information of the target PSCell may be PCI / CGI or the like, and the quality information between the serving cell and the neighboring cell may be the quality included in the Measurement Report.
  • the identification information and quality information may be included in SCG failure information, specifically, SCG failure information. Also, as mentioned above, the RACH information used may be included. That is, if the UE 200 executes the RA procedure for another selected target PSCell before the UE 200 transmits the SCG failure information, the RRC processing unit 220 may transmit the SCG failure information including the information about the RA procedure.
  • the identification information and quality information may be transmitted when the timer T304 for the secondary cell group (SCG) has expired.
  • Timer T304 is started when an RRC Reconfiguration message containing reconfigurationWithSync is received, or when a conditional reconfiguration (conditional PSCell addition / change) is executed, that is, when a stored RRC Reconfiguration message containing reconfigurationWithSync is applied. It may be stopped when random access is completed normally in the corresponding Special Cell (SpCell).
  • SpCell Special Cell
  • the RRC processing unit 220 sends SCG failure information regarding conditional PSCell addition / change.
  • the RRC processing unit 220 constitutes a transmission unit for transmitting failure information.
  • the RRC processing unit 220 sends SCG failure information to MN (for example, eNB100A).
  • MN for example, eNB100A
  • the RRC processing unit 220 may transmit SCG failure information to the SN.
  • the RRC processing unit 220 determines the identification information of the failed target PSCell and the quality information between the serving cell and the neighboring cell (further, use).
  • the SCG failure information including the RACH information may be included) may be sent.
  • the DC processing unit 230 executes processing related to dual connectivity, specifically, MR-DC. As described above, in the present embodiment, the DC processing unit 230 may execute the processing related to EN-DC, but may correspond to NE-DC and / or NR-DC.
  • the DC processing unit 230 accesses each of the eNB 100A and gNB 100B, and has a plurality of layers including RRC (medium access control layer (MAC), radio link control layer (RLC), and packet data convergence protocol layer (. PDCP) etc.) can be executed.
  • RRC medium access control layer
  • RLC radio link control layer
  • PDCP packet data convergence protocol layer
  • the control unit 240 controls each functional block constituting the UE 200.
  • the control unit 240 controls the execution of conditional PSCell addition / change.
  • control unit 240 can execute the RA procedure for another selected target PSCell (secondary cell) when the conditional PSCell addition / change fails. Further, when another selected target PSCell is included in the candidate PSCell, the control unit 240 may directly apply (apply) RRC Reconfiguration to the candidate PSCell and transmit RACH.
  • control unit 240 may execute the RA procedure for the selected target PSCell (secondary cell) before transmitting the SCG failure information.
  • the control unit 240 selects another targetPSCell first before sending the SCGfailure information, and if the selected targetPSCell is included in the candidatePSCell, the control unit 240 directly selects the candidatePSCell.
  • RRC Reconfiguration may be applied to PSCell and RACH may be transmitted.
  • FIG. 4 shows an example of a communication sequence according to a conventional conditional PSCell addition procedure.
  • the MN determines whether or not CPA is possible (necessity) based on the Measurement Report from UE200 (step 2).
  • UE200 monitors the execution condition, and if there is a targetPSCell that satisfies the execution condition, UE200 requests MN to reset the RRC of the targetPSCell ( RRC Reconfiguration Complete is returned to MN for (apply) (steps 7 and 8).
  • the setting between MN and T-SN1 is executed (steps 9 and 10), and the data transfer to T-SN1 (and UPF40) is started (step 11).
  • the UE200 then sends RACH to T-SN1 and executes the RA procedure with T-SN1 (step 12).
  • UE200 may send SCG failure information to MN.
  • the UE200 may select another targetPSCell (which may be interpreted as a targetPSCell) if the RACH with the targetPSCell fails.
  • the UE200 cannot cooperate with MN or the like when selecting another target PSCell, and cannot efficiently select another target PS Cell.
  • FIG. 5 shows an example of a communication sequence according to a conventional conditional PSCell change procedure (conditional PSCell change).
  • CPC conditional PSCell change
  • UE200 sends RACH to T-SN1 and executes the RA procedure with T-SN1 (step 14).
  • UE200 may select another targetPSCell (which may be interpreted as candidate PSCell) if RACH with targetPSCell fails.
  • the UE200 cannot cooperate with MN or the like when selecting another target PSCell, and cannot efficiently select another target PS Cell.
  • UE200 may select another candidate PSCell after RACH with T-SN1 fails, but the operation of UE200 and data transfer after that.
  • the timing of is not clear. An operation example that can solve such a problem will be described below.
  • FIG. 6 shows an example of a communication sequence according to the conditional PSCell addition procedure according to the operation example 1.
  • the timing of data transfer is improved as compared with the above-mentioned conventional example, and the content of SCG failure information is also added.
  • the UE200 when the timer T304 (T304 of SCG) for SCG has expired, the UE200 has the identification information (PCI / CGI) of the target PSCell for which the conditional PSCell addition has failed, the serving cell, and the corresponding cell. Quality information (eg, RSRP / RSRQ, etc.) of the serving cell with neighboring cells and information on the RACH used may be transmitted to the MN (step 13).
  • PCI / CGI identification information
  • Quality information eg, RSRP / RSRQ, etc.
  • the information may be transmitted to the MN in the form included in the SCG failure information. Also, as mentioned above, the RACH information used is not always essential.
  • the MN When the MN receives the SCG failure information (step 13), it sends an SN Status Transfer to the T-SN2 (step 14), and data is sent to the remaining candidate PSCell excluding the target PSCell for which the conditional PSCell addition failed.
  • the transfer may be started (step 15).
  • UE200 can select another targetPSCell, and if the selected targetPSCell is a candidatePSCell, directly request the candidatePSCell to reset the RRC and execute the RA procedure including sending RACH. Good (step 16).
  • the UE200 when the RACH transmission fails, the UE200 includes the ID of the failed targetPSCell, the quality information between the serving cell and the neighboring cell of the serving cell, and the RACH information used (optional) in the SCG failure information. It may be transmitted to MN (step 17).
  • the UE200 includes the ID of the successful targetPSCell, the quality information between the serving cell and the neighboring cell of the serving cell, and the RACH information used (optional) in the SCG failure information. May be sent to MN.
  • FIG. 7 shows a communication sequence example (No. 1) according to the conditional PSCell addition procedure according to the operation example 2.
  • FIG. 8 shows a communication sequence example (No. 2) according to the conditional PSCell addition procedure (conditional PSCell addition) according to the operation example 2.
  • FIG. 7 shows an operation example in which the first RACH associated with the conditional PSCell addition fails and the second RACH succeeds.
  • FIG. 8 shows an operation example in which both the first and second RACHs associated with the conditional PSCell addition fail.
  • the UE200 when the UE200 has expired the timer T304 (T304 of SCG) for SCG, the UE200 first selects another targetPSCell before transmitting the SCG failure information. If the selected target PSCell is a candidate PSCell, the RRC reset may be directly requested from the candidate PSCell and the RA procedure including the transmission of RACH may be executed (step 12).
  • the UE200 will send the failed targetPSCell ID, quality information between the serving cell and neighboring cells of the serving cell, and RACH information used (optional) to SCG failure information. It may be included and sent to MN.
  • the network stops accessing another targetPSCell (RACH) when the RACH to the targetPSCell (candidatePSCell) fails a predetermined number of times in a row.
  • RACH targetPSCell
  • SCG failure information may be sent to UE200 in advance. Further, instead of (or in combination with) a predetermined number of times, the access may be stopped when the timer expires.
  • the network may send an explicit instruction to the UE200 to stop access to another targetPSCell (candidatePSCell).
  • the UE200 may suspend access to another targetPSCell (candidatePSCell) and send SCG failure information to the MN in response to the instruction.
  • the target PS Cell in which the RACH transmission is successful and the ID of the first target PS Cell in which the RACH transmission is unsuccessful the serving cell at each time point and the vicinity of the serving cell.
  • Quality information with the cell and RACH information used may be included in the SCG failure information and sent to the MN.
  • the UE 200 may include an explicit instruction in the SCG failure information indicating that the data transfer is started for the target PS Cell for which the RACH transmission is successful.
  • the MN may start data transfer regarding the UE 200 when the SCG failure information is received.
  • the MN may implicitly start data transfer regarding the UE 200 to the target PS Cell that has succeeded in RACH transmission included in the SCG failure information, without such an explicit instruction.
  • the following action / effect can be obtained. Specifically, when the conditional PSCell addition / change fails, the UE 200 can transmit the identification information of the target PSCell (secondary cell) in which the conditional PSCell addition / change fails, and the quality information between the serving cell and the neighboring cell.
  • the UE200 can also execute the RA procedure for the selected target PSCell before sending the SCG failure information when the conditional PSCell addition / change fails.
  • the MN that is, the radio base station
  • the SCG failure information when the SCG failure information is received, starts data transfer regarding the UE200 to another candidate PSCell other than the failed target PSCell.
  • data transfer related to the UE 200 can be started to another candidate PS Cell in which the RA procedure (RACH transmission) by the UE 200 is successful.
  • the network including MN can optimize the SCG mobility parameter and / or RACH parameter based on the information reported from UE200 by SCG failure information. In addition, this can reduce the failure of conditional PSCell addition / change.
  • the UE 200 can execute the RA procedure for another selected target PSCell (secondary cell) when the conditional PSCell addition / change fails. Therefore, even if conditionalPSCell addition / change fails, it is possible to quickly realize a change to another targetPSCell.
  • the UE 200 when the UE 200 executes the RA procedure for another selected target PSCell before transmitting the SCG failure information, the UE 200 can transmit the SCG failure information including the information about the RA procedure. Therefore, the network may further optimize the SCG mobility parameter and / or the RACH parameter based on the information about the RA procedure reported by the UE 200 by the SCG failure information.
  • EN-DC in which MN is eNB and SN is gNB has been described as an example, but as described above, it may be another DC.
  • MN may be gNB and SN may be gNB, or MN may be gNB and SN may be NE-DC.
  • conditional PSCell addition / change has been mainly described as an example, but as described above, the conditional PSCell change procedure (MN-initiated conditional inter-SN PSCell change / SN-initiated conditional inter). -The same operation may be applied to SNPSCellchange).
  • 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 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.
  • FIG. 9 is a diagram showing an example of the hardware configuration of the device.
  • 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 FIG. 2.3) 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 the memory 1002 and the 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 ApplicationSpecific Integrated Circuit (ASIC), a ProgrammableLogicDevice (PLD), and a FieldProgrammableGateArray (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. I / O information can 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.
  • a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
  • wired technology coaxial cable, fiber optic cable, twisted 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 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.
  • 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 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.
  • 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 domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
  • 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 E-UTRAN 30 NG RAN 40 UPF 100A eNB 100B gNB 110 Wireless communication unit 120 RRC processing unit 130 DC processing unit 140 Control unit 200 UE 210 Wireless communication unit 220 RRC processing unit 230 DC processing 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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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Dans la présente invention, un UE commande l'exécution d'une procédure d'addition/modification pour une cellule secondaire. Si la procédure d'addition/modification pour la cellule secondaire échoue, l'UE transmet : les informations d'identification de la cellule secondaire pour laquelle la procédure d'addition/modification a échoué; et les informations de qualité d'une cellule de desserte et d'une cellule adjacente.
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