WO2021241412A1 - 方法及びユーザ装置 - Google Patents

方法及びユーザ装置 Download PDF

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Publication number
WO2021241412A1
WO2021241412A1 PCT/JP2021/019254 JP2021019254W WO2021241412A1 WO 2021241412 A1 WO2021241412 A1 WO 2021241412A1 JP 2021019254 W JP2021019254 W JP 2021019254W WO 2021241412 A1 WO2021241412 A1 WO 2021241412A1
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WO
WIPO (PCT)
Prior art keywords
user device
secondary cell
information
base station
scell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2021/019254
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English (en)
French (fr)
Japanese (ja)
Inventor
真人 藤代
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Kyocera Corp
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Kyocera Corp
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Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2022526965A priority Critical patent/JP7506153B2/ja
Publication of WO2021241412A1 publication Critical patent/WO2021241412A1/ja
Priority to US18/058,833 priority patent/US12349221B2/en
Anticipated expiration legal-status Critical
Priority to JP2024096251A priority patent/JP7787234B2/ja
Priority to US19/232,574 priority patent/US20250311037A1/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections

Definitions

  • the present invention relates to a method and a user device in a mobile communication system.
  • 3GPP 3rd Generation Partnership Project
  • CA carrier aggregation
  • DC dual connectivity
  • the user device sets the secondary cell (SCell) based on the setting information from the base station.
  • the user apparatus activates / deactivates the SCell in response to an instruction from the base station (Non-Patent Document 1).
  • the method according to the first aspect is a method executed in a user device.
  • the method comprises transmitting information indicating a desired behavior with respect to the secondary cell to the network.
  • the desired operation includes a first operation of enabling the secondary cell set in the user device, a second operation of invalidating the secondary cell set in the user device, and setting the secondary cell in the user device. Includes any one of the third operation.
  • the method according to the second aspect is a method executed in the user device.
  • the method receives information from the network for intermittently activating the secondary cell set in the user apparatus, and activates the secondary cell during an activation period determined based on the information. This includes invalidating the secondary cell in a period other than the activation period.
  • the method according to the third aspect is a method executed in the user device.
  • the method includes receiving information from the network that transitions the primary secondary cell set in the user apparatus to the hibernation state, and transitioning the primary secondary cell to the hibernation state based on the information. ..
  • the user device includes a transmission unit that transmits information indicating a desired operation regarding the secondary cell to the network.
  • the desired operation includes a first operation of enabling the secondary cell set in the user device, a second operation of invalidating the secondary cell set in the user device, and setting the secondary cell in the user device. Includes any one of the third operation.
  • the user device has a receiving unit that receives information for intermittently activating the secondary cell set in the user device from the network, and an activation period determined based on the information. It includes a control unit that activates the secondary cell and invalidates the secondary cell in a period other than the activation period.
  • the user device has a receiving unit that receives information from the network that transitions the primary secondary cell set in the user device to the hibernation state, and puts the primary secondary cell into the hibernation state based on the information. It is provided with a transition control unit.
  • FIG. 1 is a diagram showing a configuration of a mobile communication system according to an embodiment.
  • FIG. 2 is a diagram showing the configuration of the UE 100.
  • FIG. 3 is a diagram showing the configuration of the base station 200.
  • FIG. 4 is a diagram showing the configuration of the protocol stack of the wireless interface of the user plane.
  • FIG. 5 is a diagram showing the configuration of the protocol stack of the radio interface of the control plane.
  • FIG. 6 is a diagram showing an example of DC.
  • FIG. 7 is a diagram showing the operation of the operation example 1 of the first embodiment.
  • FIG. 8 is a diagram showing the operation of the operation example 2 of the first embodiment.
  • FIG. 9 is a diagram showing the operation of the operation example 3 of the first embodiment.
  • FIG. 10 is a diagram showing an operation of intermittent activation of SCell according to the second embodiment.
  • FIG. 11 is a diagram showing the operation of the third embodiment.
  • the current 3GPP specifications do not specify a method for the user device to notify the network of the operation related to the SCell desired by the user device (for example, the operation for activating the SCell). For example, if an application that requires high-throughput communication is suddenly started and the SCell set in the user device is disabled, the user device cannot immediately enable the SCell.
  • the purpose of this disclosure is to appropriately control the operation related to SCell.
  • the mobile communication system is a 5G system of 3GPP, but LTE may be applied to the mobile communication system at least partially.
  • FIG. 1 is a diagram showing a configuration of a mobile communication system according to an embodiment.
  • mobile communication systems include a user device (UE: User Equipment) 100, a 5G radio access network (NG-RAN: Next Generation Radio Access Network) 10, and a 5G core network (5GC: 5G). It has Core Network) 20.
  • UE User Equipment
  • NG-RAN Next Generation Radio Access Network
  • 5GC 5G core network
  • the UE 100 is a movable device.
  • the UE 100 may be any device as long as it is a device used by the user.
  • the UE 100 is a mobile phone terminal (including a smartphone), a tablet terminal, a notebook PC, a communication module (including a communication card or a chip set), a sensor or a device provided in the sensor, a vehicle or a device provided in the vehicle (Vehicle UE). ) And / or a vehicle or a device (Arial UE) provided on the vehicle.
  • the NG-RAN 10 includes a base station (called "gNB” in a 5G system) 200.
  • the gNB 200 may also be referred to as an NG-RAN node.
  • the gNB 200 are connected to each other via the Xn interface, which is an interface between base stations.
  • the gNB 200 manages one or more cells.
  • the gNB 200 performs wireless communication with the UE 100 that has established a connection with its own cell.
  • the gNB 200 has a radio resource management (RRM) function, a routing function for user data (hereinafter, simply referred to as “data”), a measurement control function for mobility control / scheduling, and the like.
  • RRM radio resource management
  • Cell is used as a term to indicate the smallest unit of a wireless communication area.
  • the term “cell” is also used to indicate a function or resource for wireless communication with the UE 100.
  • One cell belongs to one carrier frequency.
  • the gNB may be connected to the LTE core network EPC (Evolved Packet Core), or the LTE base station may be connected to the 5GC. Further, the LTE base station and gNB may be connected via an interface between base stations.
  • EPC Evolved Packet Core
  • 5GC20 includes AMF (Access and Mobility Management Function) and UPF (User Plane Function) 300.
  • the AMF performs various mobility controls and the like for the UE 100.
  • the AMF manages information on the area in which the UE 100 is located by communicating with the UE 100 using NAS (Non-Access Stratum) signaling.
  • UPF controls data transfer.
  • the AMF and UPF are connected to the gNB 200 via the NG interface, which is an interface between the base station and the core network.
  • FIG. 2 is a diagram showing the configuration of the UE 100 (user device).
  • the UE 100 includes a receiving unit 110, a transmitting unit 120, and a control unit 130.
  • the receiving unit 110 performs various receptions under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts the radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 130.
  • the transmission unit 120 performs various transmissions under the control of the control unit 130.
  • the transmitter 120 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output by the control unit 130 into a radio signal and transmits it from the antenna.
  • the control unit 130 performs various controls on the UE 100.
  • the control unit 130 includes at least one processor and at least one memory electrically connected to the processor.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor may include a baseband processor and a CPU (Central Processing Unit).
  • the baseband processor modulates / demodulates and encodes / decodes the baseband signal.
  • the CPU executes a program stored in the memory to perform various processes.
  • FIG. 3 is a diagram showing the configuration of gNB200 (base station).
  • the gNB 200 includes a transmission unit 210, a reception unit 220, a control unit 230, and a backhaul communication unit 240.
  • the transmission unit 210 performs various transmissions under the control of the control unit 230.
  • the transmitter 210 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output by the control unit 230 into a radio signal and transmits it from the antenna.
  • the receiving unit 220 performs various receptions under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts the radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 230.
  • the control unit 230 performs various controls on the gNB 200.
  • the control unit 230 includes at least one processor and at least one memory electrically connected to the processor.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor may include a baseband processor and a CPU.
  • the baseband processor modulates / demodulates and encodes / decodes the baseband signal.
  • the CPU executes a program stored in the memory to perform various processes.
  • the backhaul communication unit 240 is connected to an adjacent base station via an interface between base stations.
  • the backhaul communication unit 240 is connected to the AMF / UPF 300 via the base station-core network interface.
  • the gNB is composed of a CU (Central Unit) and a DU (Distributed Unit) (that is, the functions are divided), and both units may be connected by an F1 interface.
  • FIG. 4 is a diagram showing a configuration of a protocol stack of a wireless interface of a user plane that handles data.
  • the user plane wireless interface protocol includes a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer. It has an SDAP (Service Data Adjustment Protocol) layer.
  • PHY physical
  • MAC Medium Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • SDAP Service Data Adjustment Protocol
  • the PHY layer performs coding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the gNB 200 via a physical channel.
  • a frame structure including radio frames, subframes, slots, and symbols is used.
  • the radio frame is composed of 10 subframes on the time axis.
  • the length of each subframe is 1 ms.
  • Each subframe is composed of a plurality of slots.
  • Each slot is composed of a plurality of symbols.
  • Each subframe contains a plurality of resource blocks (RBs) on the frequency axis.
  • Each resource block contains a plurality of subcarriers on the frequency axis.
  • the frequency resource can be specified by the resource block, and the time resource can be specified by the subframe (or slot, symbol).
  • the section of the first number symbol of each subframe is an area mainly used as a physical downlink control channel (PDCCH: Physical Downlink Control Channel) for transmitting downlink control information.
  • the rest of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH: Physical Downlink Shared Channel) for transmitting downlink data.
  • PDSCH Physical Downlink Shared Channel
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), random access procedure, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the gNB 200 via the transport channel.
  • the MAC layer of gNB200 includes a scheduler. The scheduler determines the transport format (transport block size, modulation / coding method (MCS)) of the upper and lower links and the resource block allocated to the UE 100.
  • MCS modulation / coding method
  • the RLC layer transmits data to the receiving RLC layer by using the functions of the MAC layer and the PHY layer. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the gNB 200 via a logical channel.
  • the PDCP layer performs header compression / decompression and encryption / decryption.
  • the SDAP layer maps the IP flow, which is a unit for performing QoS control by the core network, with the wireless bearer, which is a unit for performing QoS control by AS (Access Stratum).
  • AS Access Stratum
  • FIG. 5 is a diagram showing a configuration of a protocol stack of a wireless interface of a control plane that handles signaling (control signal).
  • the protocol stack of the radio interface of the control plane has an RRC (Radio Resource Control) layer and a NAS (Non-Access Stratum) layer in place of the SDAP layer shown in FIG.
  • RRC signaling for various settings is transmitted between the RRC layer of UE100 and the RRC layer of gNB200.
  • the RRC layer controls logical channels, transport channels, and physical channels in response to the establishment, re-establishment, and release of radio bearers.
  • RRC connection connection between the RRC of the UE 100 and the RRC of the gNB 200
  • the UE 100 is in the RRC connection state.
  • RRC idle state If there is no connection (RRC connection) between the RRC of the UE 100 and the RRC of the gNB 200, the UE 100 is in the RRC idle state. Further, when the RRC connection is suspended, the UE 100 is in the RRC inactive state.
  • the NAS layer located above the RRC layer performs session management, mobility management, etc.
  • NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the AMF300.
  • the UE 100 has an application layer and the like in addition to the protocol of the wireless interface.
  • the UE 100 having a plurality of transmitters / receivers is set to use a plurality of cells managed by one base station 200.
  • the plurality of cells includes one primary cell (PCell) and at least one secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • At least a downlink resource is set in one SCell.
  • An uplink resource may or may not be set for one SCell.
  • the UE 100 sets the SCell based on the setting information from the base station 200. An index is assigned to each of the SCells set in the UE 100.
  • the initial state of the SCell set in the UE 100 may be an activated state or a disabled state.
  • the UE 100 activates / disables the SCell in response to an instruction from the base station 200.
  • enabling SCell means transitioning to the enabled state of SCell.
  • Disabling SCell means transitioning to the invalidated state of SCell.
  • the UE 100 transmits SRS (Sounding Reference Signal), measures and reports CSI (Channel State Information), and monitors PDCCH in the SCell in the enabled state.
  • SRS Sounding Reference Signal
  • CSI Channel State Information
  • CSI reports include CQI (Cannel Quality Information) reports, PMI (Precoding Matrix Indicator) reports, RI (Rank Indicator) reports, and the like.
  • the UE 100 measures the CSI-RS (Reference Signal) transmitted by the base station 200, and determines the CQI, PMI, RI, etc. to be reported based on the measurement result.
  • the base station 200 schedules the UE 100 based on the CSI report received from the UE 100 (for example, assigns a downlink resource to the UE 100, selects MCS (Modulation and Coding Scene), and the like).
  • the UE 100 does not transmit SRS (Sounding Reference Signal), measure and report CSI, and monitor PDCCH in the disabled SCell.
  • SRS Sounding Reference Signal
  • DC dual connectivity
  • MR-DCs Multi-RAT DCs
  • Multi-connivity Multi-connivity
  • a UE 100 having a plurality of transmitters / receivers is set to utilize resources provided by two different nodes (two different base stations).
  • One base station provides NR access and the other base station provides E-UTRA (LTE) or NR access.
  • the base station 200A may be an eNB or a gNB
  • the base station 200B may be an eNB or a gNB.
  • one base station 200A functions as a master node (MN), and the other base station 200B functions as a secondary node (SN).
  • MN is a wireless access node that provides a control plane connection to the core network.
  • the MN is sometimes referred to as the master base station.
  • the SN is a wireless access node that does not have a control plane connection to the core network.
  • the SN is sometimes referred to as a secondary base station.
  • the MN and SN are connected via a network interface (interbase station interface), and at least the MN is connected to the core network.
  • FIG. 6 shows an example in which the interface between base stations is an Xn interface, the interface between base stations may be an X2 interface.
  • the MN and SN transmit and receive various information described later via the interface between base stations.
  • the group of serving cells set in UE 100 which is a cell of MN, is called a master cell group (MCG).
  • MCG master cell group
  • SCG secondary cell group
  • a cell belonging to SCG is called SCG Cell.
  • the SCG includes a primary SCG Cell (PSCell) and zero or a plurality of SCGs. That is, the SCG may include only PSCell.
  • PSCell primary SCG Cell
  • PUCCH Physical Uplink Control Channel
  • the UE 100 transmits a CSI report for some SCells belonging to the SCG on the PUCCH of the PSCell.
  • the UE 100 performs an RA (Random Access) procedure for PSCell when the SCG is newly set.
  • RA Random Access
  • the UE 100 has an operation of enabling the SCell set in the UE 100, an operation of disabling the SCell set in the UE 100, and an operation of setting the SCell in the UE 100. It is an embodiment relating to transmitting the information indicating any one to the base station 200.
  • the UE 100 transmits information indicating an operation of enabling the SCell set in the UE 100 or an operation of disabling the SCell set in the UE 100 to the base station 200 as a desired operation regarding the SCell.
  • FIG. 7 is a diagram showing the operation of the operation example 1.
  • step S101 the UE 100 has established an RRC connection with the base station 200 and is in an RRC connection state.
  • at least one invalidated SCell is set in the UE 100 from the base station 200 and communicates with the base station 200.
  • the SCell is managed by the base station 200.
  • the UE 100 may have one or more activated SCells set from the base station 200.
  • the UE 100 determines a rate value (hereinafter, referred to as a “required communication rate value”) indicating a communication rate required by the UE 100.
  • the communication rate may be a throughput or a data transmission rate.
  • the UE 100 may determine a value indicating the communication rate required by the UE 100 based on the currently running application.
  • the UE 100 may determine the total value of the communication rate values requested by each of the currently running applications as the required communication rate value.
  • the UE 100 may determine the maximum value of the communication rate values requested by each of the currently running applications as the required communication rate value.
  • the UE 100 may determine the required communication rate value based on the CPU usage rate (or usage amount), the memory usage rate (or usage amount), and the like.
  • the UE 100 determines whether the required communication rate value is equal to or higher than the first threshold value.
  • the UE 100 may set the first threshold value based on the threshold value information received from the base station 200.
  • the UE 100 may autonomously set the first threshold value. For example, the UE 100 predicts the maximum communication rate provided by the serving cell based on the radio quality (RSRP, RSRQ, SINR, etc.) and bandwidth of the current serving cell, and sets the maximum communication rate as the first threshold value. May be good.
  • the UE 100 may predict the maximum communication rate of each of the plurality of serving cells and set the total value of the maximum communication rates of each serving cell as the first threshold value.
  • step S103 determines that the required communication rate value is equal to or higher than the first threshold value (step S103: YES).
  • the UE 100 proceeds to the process in step S104.
  • step S104 the UE 100 transmits information indicating an operation for activating the SCell set in the UE 100 (hereinafter, referred to as “SCell activation desired information”) to the base station 200 as a desired operation regarding the SCell.
  • SCell activation desired information information indicating an operation for activating the SCell set in the UE 100
  • the base station 200 can grasp that the UE 100 desires to enable the SCell set in the UE 100.
  • the UE 100 may transmit the SCell activation desired information by an RRC message (for example, a UE assist information message) or by a MAC CE.
  • an RRC message for example, a UE assist information message
  • a MAC CE for example, a MAC CE
  • the UE 100 may further transmit information indicating the required communication rate value together with the SCell activation desired information.
  • the base station 200 can grasp the communication rate required by the UE 100, and can activate the SCell capable of providing the communication rate.
  • the UE 100 may further transmit a measurement report including radio quality for the SCell that has been disabled, along with the SCell activation request information. Thereby, the base station 200 can identify the SCell with good radio quality and can activate the SCell.
  • the UE 100 may transmit the SCell activation desired information in such a manner that the SCell desired to be activated can be identified.
  • the base station 200 can specify the SCell that the UE 100 wants to enable.
  • the UE 100 determines, among the disabled SCells, the SCell capable of providing the required communication rate as the SCell desired to be enabled, based on the radio quality and bandwidth of each of the disabled SCells. You may.
  • the UE 100 transmits the SCell activation desired information in such a manner that the SCell desired to be activated can be identified
  • the UE 100 transmits the cell identifier or index of the SCell desired to be activated together with the SCell activation desired information. May be good.
  • the UE 100 may transmit the cell identifier or index of the SCell that is desired to be activated as the SCell activation desired information.
  • the UE 100 generates a MAC CE including a field corresponding to each index of the SCell set in the UE 100, sets the value of the field corresponding to the index of the SCell desired to be activated to "1", and sets the MAC to the MAC. CE may be transmitted.
  • step S105 the UE 100 receives a SCell activation instruction from the base station 200, which instructs the activation of one or a plurality of SCells.
  • step S106 the UE 100 activates the one or more SCells in response to the SCell activation instruction.
  • step S107 the UE 100 determines the required communication rate value as in the process in step S102.
  • step S108 the UE 100 determines whether the required communication rate value is less than the second threshold value.
  • the UE 100 may set a second threshold value based on the threshold value information received from the base station 200.
  • the UE 100 may autonomously set the second threshold value.
  • the second threshold value may be the same value as the first threshold value in step S103.
  • step S108 determines that the required communication rate value is less than the second threshold value (step S108: YES)
  • the UE 100 proceeds to the process in step S109.
  • step S109 the UE 100 transmits information indicating an operation for invalidating the SCell set in the UE 100 (hereinafter, referred to as “SCell invalidation desired information”) to the base station 200 as a desired operation regarding the SCell.
  • SCell invalidation desired information information indicating an operation for invalidating the SCell set in the UE 100
  • the base station 200 can grasp that the UE 100 desires to invalidate the SCell set in the UE 100.
  • the UE 100 may transmit the SCell invalidation request information by an RRC message (for example, a UE assist information message) or by a MAC CE.
  • an RRC message for example, a UE assist information message
  • a MAC CE for example, a MAC CE
  • the UE 100 may further transmit information indicating the required communication rate value together with the SCell invalidation request information.
  • the base station 200 can grasp the communication rate required by the UE 100, and can disable other SCells while enabling the SCell that can provide the communication rate.
  • the UE 100 may further transmit a measurement report including radio quality for the enabled SCell along with the SCell invalidation request information.
  • the base station 200 can identify the SCell having poor radio quality and can invalidate the SCell.
  • the UE 100 may transmit the SCell invalidation request information in such a manner that the SCell desired to be invalidated can be identified.
  • the base station 200 can specify the SCell that the UE 100 desires to invalidate.
  • the UE 100 determines the SCell that can provide the required communication rate based on the radio quality and bandwidth of each of the enabled SCells, and determines the other SCells as the SCells that are desired to be disabled. May be good.
  • the UE 100 transmits the SCell invalidation request information in such a manner that the SCell desired to be invalidated can be identified
  • the UE 100 transmits the cell identifier or index of the SCell desired to be invalidated together with the SCell invalidation request information. May be good.
  • the UE 100 may transmit the cell identifier or index of the SCell that is desired to be invalidated as the SCell invalidation desired information.
  • the UE 100 generates a MAC CE including a field corresponding to each index of the SCell set in the UE 100, sets the value of the field corresponding to the index of the SCell desired to be invalidated to "0", and sets the MAC to "0". CE may be transmitted.
  • step S110 the UE 100 receives a SCell invalidation instruction instructing the invalidation of one or a plurality of SCells from the base station 200.
  • step S111 the UE 100 invalidates the one or more SCells in response to the SCell invalidation instruction.
  • the UE 100 may omit the processing of steps S102 to S103 and / or steps S107 to S108.
  • the UE 100 transmits SCell activation desired information to the base station 200 when SCell activation is required.
  • the processing of steps S107 to S108 is omitted, the UE 100 transmits the SCell invalidation desired information to the base station 200 when the SCell needs to be invalidated.
  • the UE 100 may transmit SCell activation desired information when the rate value indicating the communication rate required within a certain period in the future is equal to or higher than the first threshold value.
  • the UE 100 may transmit SCell activation desired information when the amount of transmission data generated within a certain period in the future is equal to or greater than the first data amount.
  • a fixed period is represented by the number of milliseconds or the number of subframes.
  • a fixed period is set by the base station 200.
  • the first data amount is set by the base station 200.
  • a notification of mass data communication prediction may be transmitted to the base station 200 instead of the SCell activation request information.
  • the base station 200 may consider that the UE 100 desires the activation of the SCell set in the UE 100, and may transmit the SCell activation instruction to the UE 100.
  • the UE 100 may transmit SCell invalidation request information when the rate value indicating the communication rate required within a certain period in the future is less than the second threshold value.
  • the UE 100 may transmit SCell invalidation desired information when the amount of transmission data generated within a certain period in the future is less than the second data amount.
  • the second data amount is set by the base station 200.
  • the rate value indicating the communication rate required in the future fixed period is less than the second threshold value, or the amount of transmission data generated in the fixed period in the future is the second data. If the amount is less than the amount, a notification of small amount data communication prediction may be transmitted to the base station 200 instead of the SCell invalidation request information.
  • the base station 200 may consider that the UE 100 desires to invalidate the SCell set in the UE 100, and may transmit the SCell invalidation instruction to the UE 100.
  • each threshold value (first threshold value, second threshold value, first data amount, second data amount) may be set separately for uplink communication and downlink communication.
  • the UE 100 determines the required communication rate value and / or the amount of transmission data separately for uplink communication and downlink communication, and compares them with the corresponding threshold values.
  • the UE 100 activates the SCell in which the uplink resource is set as a desired operation regarding the SCell when the required communication rate value for the uplink communication is equal to or higher than the first threshold value set for the uplink communication.
  • the UE 100 indicates an operation of invalidating the SCell in which the uplink resource is set as a desired operation regarding the SCell when the required communication rate value of the uplink communication is less than the second threshold value set for the uplink communication.
  • Send information is included in the SCell in which the uplink resource is set as a desired operation regarding the SCell when the required communication rate value of the uplink communication is less than the second threshold value set for the uplink communication.
  • the operation example 2 is an operation example relating to transmitting information indicating an operation of enabling the SCG Cell set in the UE 100 or an operation of disabling the SCG Cell set in the UE 100 as a desired operation regarding the SCell. ..
  • FIG. 8 is a diagram showing the operation of the operation example 2.
  • step S201 the UE 100 has established an RRC connection with the base station 200A and is in an RRC connection state.
  • step S202 the UE 100 starts DC communication with the base station 200A and the base station 200B.
  • at least one invalidated SCG Cell is set in the UE 100.
  • the base station 200A functions as the MN of the UE 100
  • the base station 200B functions as the SN of the UE 100.
  • steps S203 to S204 is the same as in steps S102 to S103.
  • step S205 as a desired operation regarding the SCell, the UE 100 refers to information indicating an operation for activating the SCG Cell set in the UE 100 (hereinafter, referred to as “SCG Cell activation desired information”) as the base station 200A or the base station. Send to 200B.
  • SCG Cell activation desired information information indicating an operation for activating the SCG Cell set in the UE 100
  • the UE 100 may further transmit information indicating the required communication rate value together with the SCG Cell activation desired information.
  • the UE 100 may further transmit a measurement report including radio quality for the disabled SCG Cell, along with the SCG Cell activation request information.
  • the UE 100 may transmit the SCG Cell activation desired information in such a manner that the SCG Cell whose activation is desired can be identified.
  • the UE 100 transmits the SCG Cell activation desired information to the base station 200A
  • the UE 100 transmits the SCG Cell activation desired information as an RRC message (for example, a UE assist information message).
  • the base station 200A transfers the SCG Cell activation desired information to the base station 200B.
  • the UE 100 may transmit the SCG Cell activation desired information by an RRC message via SRB3 or by MAC CE.
  • SRB3 refers to a control radio bearer established between the UE 100 and the SN.
  • the UE 100 generates a MAC CE including a field corresponding to each index of the SCG Cell set in the UE 100, sets the value of the field corresponding to the index of the SCG Cell desired to be activated to "1", and sets the value to "1".
  • the MAC CE may be transmitted.
  • step S206 the UE 100 receives an SCG Cell activation instruction instructing activation of one or a plurality of SCG Cells from the base station 200A or the base station 200B.
  • the SCG Cell activation instruction is transmitted from the base station 200B to the base station 200A and then transmitted to the UE 100.
  • step S207 the UE 100 activates the one or more SCG Cell in response to the SCG Cell activation instruction.
  • steps S208 to S209 is the same as in steps S107 to S108.
  • step S210 as a desired operation regarding the SCell, the UE 100 refers to information indicating an operation for disabling the SCG Cell set in the UE 100 (hereinafter, referred to as “SCG Cell invalidation desired information”) as the base station 200A or the base station. Send to 200B. As a result, the base station 200A or the base station 200B grasps that the UE 100 desires to invalidate the SCG Cell set in the UE 100.
  • SCG Cell invalidation desired information information indicating an operation for disabling the SCG Cell set in the UE 100
  • the UE 100 may further transmit information indicating the required communication rate value together with the SCG Cell invalidation desired information.
  • the UE 100 may further transmit a measurement report including radio quality for the enabled SCG Cell, along with the SCG Cell invalidation request information.
  • the UE 100 may transmit the SCG Cell invalidation request information in such a manner that the SCG Cell desired to be invalidated can be identified.
  • the UE 100 When transmitting the SCG Cell invalidation request information to the base station 200A, the UE 100 transmits the SCG Cell invalidation request information as an RRC message (for example, a UE assist information message). In this case, the base station 200A transfers the SCG Cell invalidation request information to the base station 200B.
  • RRC message for example, a UE assist information message
  • the UE 100 may transmit the SCG Cell invalidation request information by an RRC message via SRB3 or by MAC CE.
  • the UE 100 generates a MAC CE including a field corresponding to each index of the SCG Cell set in the UE 100, sets the value of the field corresponding to the index of the SCG Cell desired to be invalidated to "0", and sets the value to "0".
  • the MAC CE may be transmitted.
  • step S211th the UE 100 receives an SCG Cell invalidation instruction instructing the invalidation of one or a plurality of SCG Cells from the base station 200A or the base station 200B.
  • the SCG Cell invalidation instruction is transmitted from the base station 200B to the base station 200A and then transmitted to the UE 100.
  • step S212 the UE 100 invalidates the one or more SCG Cell in response to the SCG Cell invalidation instruction.
  • the UE 100 may transmit information indicating that SCG activation (that is, activation of all cells belonging to SCG) is desired as SCG Cell activation desired information.
  • the UE 100 may transmit information indicating that SCG invalidation (that is, invalidation of all cells belonging to SCG) is desired as SCG Cell invalidation desired information.
  • the operation example 3 is an operation example relating to transmitting information indicating an operation of setting the SCell to the UE 100 as a desired operation regarding the SCell.
  • FIG. 9 is a diagram showing the operation of the operation example 3.
  • step S301 the UE 100 has established an RRC connection with the base station 200 and is in the RRC connected mode.
  • the UE 100 does not have a SCell (that is, neither CA nor DC is set), and wirelessly communicates with the base station 200 via only one serving cell.
  • steps S302 to S303 is the same as in steps S102 to S103.
  • step S304 the information indicating that the UE 100 desires an operation of setting the SCell in the UE 100 (that is, an operation of setting the CA in the UE 100) as a desired operation regarding the SCell (hereinafter referred to as "SCell setting desired information"). ) Is transmitted to the base station 200. As a result, the base station 200 grasps that the UE 100 desires to set the SCell to the UE 100.
  • the UE 100 may transmit the SCell setting desired information by an RRC message (for example, a UE assist information message) or by a MAC CE.
  • an RRC message for example, a UE assist information message
  • a MAC CE for example, a MAC CE
  • the UE 100 may transmit a candidate cell list including the cell identifier of the candidate cell together with the SCell setting desired information.
  • the candidate cell list may include information indicating the radio quality of each candidate cell.
  • the UE 100 may determine a cell having a quality satisfying a predetermined quality standard (S-criteria or R-criteria) as a candidate cell.
  • S-criteria or R-criteria a predetermined quality standard as a candidate cell.
  • the base station 200 can set a cell having good radio quality as a SCell in the UE 100 based on the candidate cell list.
  • the UE 100 may further transmit information indicating a required communication rate value together with the SCell setting desired information.
  • the base station 200 can set the cell capable of providing the communication rate indicated by the required communication rate value as the SCell in the UE 100.
  • the base station 200 grasps that the UE 100 desires to set the SCG to the UE 100.
  • the UE 100 may transmit the above-mentioned candidate cell list and / or information indicating the required communication rate value together with the SCG setting desired information. Based on this information, the base station 200 can set an appropriate cell as a PSCell (and a SCell belonging to SCG) in the UE 100.
  • step S305 the UE 100 receives an instruction for setting the SCell or SCG from the base station 200.
  • step S306 the UE 100 sets the SCell or SCG according to the instruction.
  • the second embodiment is an embodiment relating to intermittently enabling the SCell set in the UE 100. By enabling SCell intermittently, it is possible to save power in the UE 100.
  • FIG. 10 is a diagram showing the operation of intermittent activation of SCell.
  • the UE 100 performs an intermittent activation operation for the set SCell. Specifically, the UE 100 activates the SCell at the activation start timing (t1, t2, t3 ...) That occurs in each cycle (T). The UE 100 continuously activates the SCell during the activation period within one cycle (T). The UE 100 invalidates the SCell in a period other than the activation period within one cycle (T).
  • the UE 100 may perform CSI measurement and reporting regarding the SCell while maintaining the invalidation of the SCell.
  • the base station 200 that manages the SCell can schedule the UE 100 (assign a downlink resource to the UE 100, select an MCS, and the like).
  • the UE 100 may transmit SRS in the SCell while maintaining the invalidation of the SCell.
  • the base station 200 that manages the SCell can grasp the uplink channel quality of the UE 100 and can allocate an appropriate uplink resource to the UE 100.
  • the UE 100 does not have to transmit the SRS when the uplink transmission is not performed.
  • the above-mentioned activation start timing, cycle (T), activation period, and predetermined period are set from the base station 200 to the UE 100. Further, a radio resource for performing CSI measurement and reporting in a predetermined period (hereinafter, referred to as “CSI radio resource”) is set from the base station 200.
  • the radio resource for CSI includes a radio resource for transmitting CSI-RS, a radio resource for transmitting a CSI report, and the like.
  • the activation start timing may be represented by a radio frame number and a subframe number, or may be represented by a slot number and a symbol number in addition to the radio frame number and the subframe number.
  • the cycle (T), activation period, and predetermined period are represented by the number of milliseconds or the number of subframes.
  • the activation period may be dynamically extended. For example, the UE 100 activates the timer when the downlink user data is received or the uplink data is transmitted during the activation period. When the timer is running, the UE 100 continuously activates the SCell. That is, the activation period is extended until the timer expires. The value of the timer is set from the base station 200.
  • the UE 100 when the UE 100 receives a PDCCH addressed to its own UE 100 during the activation period, the UE 100 activates a timer.
  • the UE 100 may start a timer when transmitting an SR (scheduling request) and / or a BSR (buffer status report) during the activation period.
  • SR scheduling request
  • BSR buffer status report
  • the operation of intermittent activation may be applied to the SCG Cell.
  • the operation of intermittent activation may be applied to PSCell in SCG Cell.
  • the UE 100 receives from the base station 200 information for setting the operation of intermittent activation of SCell (hereinafter, referred to as "intermittent activation setting information"), and intermittent activation is performed.
  • the above-mentioned intermittent activation operation of the SCell is performed based on the setting information.
  • the intermittent activation setting information includes the identification information (SCell identifier or index) of the target SCell for intermittent activation and the intermittent activation. It contains information indicating parameters related to the operation of activation (activation start timing, period (T), activation period, predetermined period, and timer value).
  • the intermittent activation setting information may be transmitted from the base station 200A to the UE 100 and the base station 200B.
  • the intermittent activation setting information may be transmitted from the base station 200B to the UE 100 via the SRB3.
  • the UE 100 may transmit the intermittent activation setting information received from the base station 200B to the base station 200A.
  • the third embodiment is an embodiment relating to transitioning the PSCell set in the UE 100 to a dormant state. By transitioning the PSCell to the hibernation state, the power saving of the UE 100 can be achieved.
  • the UE 100 does not monitor the PDCCH on the dormant PSCell, but may measure the CSI for the PSCell.
  • the UE 100 may perform AGC (Automatic Gain Control) and beam management (beam measurement and selection, beam failure recovery, etc.) for the dormant PSCell.
  • AGC Automatic Gain Control
  • beam management beam measurement and selection, beam failure recovery, etc.
  • FIG. 11 is a diagram showing the operation of the third embodiment.
  • step S401 the UE 100 has established an RRC connection with the base station 200A and is in an RRC connection state.
  • step S402 the UE 100 starts DC communication with the base station 200A and the base station 200B.
  • step S403 the base station 200A transmits the PSCell hibernation setting information for transitioning the PSCell to the hibernation state to the UE 100 by an RRC message or MAC CE.
  • the PSCell hibernation setting information includes information for determining the timing at which the PSCell transitions to the hibernation state (hereinafter, referred to as "pause timing").
  • the UE 100 determines the pause timing based on the PSCell pause setting information.
  • the PSCell pause setting information includes a timer value
  • the UE 100 activates a timer corresponding to the timer value in response to the reception of the PSCell pause setting information, and determines the timer expiration timing as the pause timing. That is, the UE 100 transitions the PSCell to the hibernation state at the timing when the timer expires.
  • the PSCell hibernation setting information is simply an instruction to transition the PSCell to the hibernation state, and the UE 100 may determine the timing at which such an instruction is received as the hibernation timing.
  • the PSCell pause setting information is also transmitted from the UE 100 or the base station 200A to the base station 200B.
  • the base station 200B grasps the pause timing based on the PSCell pause setting information, and stops the transmission of PDCCH to the UE 100.
  • step S404 the UE 100 transitions the PS Cell to the hibernation state at the hibernation timing.
  • step S405 the UE 100 performs CSI measurement at the dormant PSCell and transmits a CSI report for the CSI measurement to the base station 200A.
  • the UE 100 may periodically measure and report the CSI.
  • the cycle is set from the base station 200A.
  • step S406 the base station 200A transmits the PSCell activation setting information for enabling the PSCell to the UE 100 by an RRC message or a MAC CE.
  • the PSCell activation setting information includes information for determining the timing for enabling the PSCell (hereinafter referred to as "activation timing").
  • the UE 100 determines the activation timing based on the PSCell activation setting information.
  • the PSCell activation setting information is also transmitted from the base station 200A to the base station 200B.
  • step S408 the UE 100 activates PSCell at the activation timing.
  • the base station 200B After transmitting the PSCell activation setting information and before the activation timing, in step S407, the base station 200B receives the CSI report of the PSCell from the UE 100 or the base station 200A. This allows the base station 200B to schedule the UE 100 immediately after PSCell is activated.
  • the base station 200B When the period from the timing when the base station 200B receives the PSCell activation setting information to the activation timing is shorter than the allowable delay on the base station interface between the base station 200A and the base station 200B, the activation timing has arrived. Before this, the CSI report transmitted from the base station 200A may not reach the base station 200B. In this case, in step S407, the base station 200B receives the CSI report from the UE 100.
  • a program may be provided that causes a computer to execute each process performed by the UE 100 and the base station 200 (base station 200A, base station 200B).
  • the program may be recorded on a computer-readable medium.
  • Computer-readable media can be used to install programs on a computer.
  • the computer-readable medium on which the program is recorded may be a non-transient recording medium.
  • the non-transient recording medium is not particularly limited, but may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.
  • a circuit for executing each process performed by the UE 100 and the base station 200 (base station 200A, base station 200B) is integrated, and at least a part of the UE 100 and the base station 200 (base station 200A, base station 200B) is a semiconductor integrated circuit. It may be configured as (chipset, SoC).

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