WO2017163676A1 - Dispositif terminal, dispositif station de base, procédé de communication, et circuit intégré - Google Patents

Dispositif terminal, dispositif station de base, procédé de communication, et circuit intégré Download PDF

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Publication number
WO2017163676A1
WO2017163676A1 PCT/JP2017/005529 JP2017005529W WO2017163676A1 WO 2017163676 A1 WO2017163676 A1 WO 2017163676A1 JP 2017005529 W JP2017005529 W JP 2017005529W WO 2017163676 A1 WO2017163676 A1 WO 2017163676A1
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Prior art keywords
cell
timer
handover
base station
terminal device
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English (en)
Japanese (ja)
Inventor
秀和 坪井
翔一 鈴木
山田　昇平
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • the present invention relates to a terminal device, a base station device, a communication method, and an integrated circuit.
  • a wireless access method and a wireless network for cellular mobile communication (hereinafter referred to as “Long Term Evolution (LTE: registered trademark)” or “Evolved Universal Terrestrial Access: EUTRA”) is a third generation partnership project (3rd Generation). (Partnership Project: 3GPP) (Non-Patent Documents 1, 2, 3, 4, 5).
  • 3GPP Third Generation Partnership Project
  • a base station apparatus is also called eNodeB (evolved NodeB), and a terminal apparatus is also called UE (User Equipment).
  • LTE is a cellular communication system in which a plurality of areas covered by a base station apparatus are arranged in a cell shape. A single base station apparatus may manage a plurality of cells.
  • a terminal apparatus (UE: User Equipment) establishes communication with a base station apparatus as a handover destination while maintaining communication with a connected base station apparatus.
  • UE User Equipment
  • 3GPP TS 36.211 V13.0.0 (2015-12) http: // www. 3 gpp. org / DynaReport / 36843.
  • htm 3GPP TS 36.212 V13.0.0 (2015-12) http: // www. 3 gpp. org / DynaReport / 36843.
  • htm 3GPP TS 36.213 V13.0.0 (2015-12) http: // www. 3 gpp. org / DynaReport / 36843.
  • htm 3GPP TS 36.321 V13.0.0 (2015-12) http: // www. 3 gpp. org / DynaReport / 36843.
  • htm 3GPP TS 36.331 V13.0.0 (2015-12) http: // www.
  • the present invention relates to a terminal device capable of efficiently continuing communication with a base station device, a base station device communicating with the terminal device, a communication method used for the terminal device, and a communication method used for the base station device An integrated circuit mounted on the terminal device and an integrated circuit mounted on the base station device are provided.
  • a first aspect of the present invention is a terminal apparatus that communicates with a base station apparatus via a cell, and in the first cell, a handover command for instructing a handover to the second cell is sent from the base station apparatus.
  • the radio resource control (RRC) is reestablished as a radio link failure, and the first timer expires
  • RRC radio resource control
  • the second timer is not considered a radio link failure and does not perform radio resource control (RRC) re-establishment
  • the first timer starts timing when a handover command is received
  • the timer is a timer, and the second timer starts counting when a predetermined number of consecutive out-of-synchronization states in the first cell are detected, and continues the synchronization state in the first cell.
  • the second timer further receives a handover command when the handover is a handover that does not continue communication with the first cell after receiving the handover command. Then, the clocking is stopped, and when the handover is a handover in which communication with the first cell is continued even after the handover command is received, the clocking is continued.
  • the second timer may be configured to receive a handover command when the handover is a handover that continues communication with the first cell even after the handover command is received. Measure time.
  • a second aspect of the present invention is a base station device that communicates with a terminal device, and transmits a handover command instructing handover from the first cell to the second cell to the terminal device.
  • the timer includes a value to be set in the first timer, and the timer is a radio link failure in the first cell when the handover is a handover that continues communication with the first cell even after receiving the handover command. Used to determine.
  • a third aspect of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device via a cell, and instructs a handover to the second cell in the first cell.
  • RRC radio resource control
  • the first timer is a timer that starts timing when a handover command is received, and the second timer continues the out-of-sync state in the first cell. It starts timing upon predetermined frequency detecting a timer to stop the counting when the predetermined number of times detects a synchronization state in the first cell in succession.
  • a fourth aspect of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device via a cell, and instructs a handover to the second cell in the first cell.
  • a step of receiving a handover command from the base station apparatus and when the first timer expires, radio resource control (RRC) re-establishment is considered as a radio link failure if the second timer is timing or has expired.
  • RRC radio resource control
  • the radio link control is not regarded as a radio link failure and no radio resource control (RRC) re-establishment is performed.
  • the timer is a timer that starts timing when a handover command is received, and the second timer continuously counts out-of-sync conditions in the first cell. It starts timing upon detecting a timer to stop the counting when the predetermined number of times detected state of synchronization in the first cell in succession.
  • the terminal device and the base station device can continue to communicate with each other efficiently.
  • FIG. 3 is a diagram illustrating a user plane (UP (User-plane, U-Plane)) protocol stack according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a control plane (CP (Control-plane, C-Plane)) protocol stack according to an embodiment of the present invention. It is a figure which shows an example of the sequence chart regarding the contention based random access procedure which concerns on embodiment of this invention.
  • UP User-plane, U-Plane
  • CP Control-plane, C-Plane
  • FIG. 3 shows an example of a flowchart regarding detection of a radio link failure (Radio Link Failure) according to an embodiment of the present invention.
  • FIG. 1 is a conceptual diagram of the wireless communication system of the present embodiment.
  • the wireless communication system includes a terminal device 2 and a base station device 3.
  • the base station apparatus 3 includes a source base station apparatus 3A, a target base station apparatus 3B, and MME (Mobility Management Entity) / GW (Gateway).
  • Uu is a radio access link between the terminal device 2 and the base station device 3.
  • Uu includes an uplink from the terminal apparatus 2 to the base station apparatus 3 and a downlink from the base station apparatus 3 to the terminal apparatus 2.
  • X2 is a backhaul link between the source base station apparatus 3A and the target base station apparatus 3B.
  • S1 is a backhaul link between the source base station apparatus 3A / target base station apparatus 3B and the MME / GW.
  • the terminal device 2 may be handed over from the source base station device 3A to the target base station device 3B.
  • the terminal device 2 may be handed over from the source cell to the target cell.
  • the source cell may be managed by the source base station apparatus 3A.
  • the target cell may be managed by the target base station device 3B.
  • the source base station device 3A and the target base station device 3B may be the same device. That is, the terminal device 2 may be handed over from the source cell managed by the source base station device 3A to the target cell managed by the source base station device 3A.
  • the source cell is also referred to as a source primary cell.
  • the target cell is also referred to as a target primary cell.
  • the following uplink physical channels are used in uplink wireless communication from the terminal device 2 to the base station device 3.
  • the uplink physical channel is used by the physical layer to transmit information output from the higher layer.
  • ⁇ PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • PRACH Physical Random Access Channel
  • the PUCCH is used to transmit uplink control information (Uplink Control Information: UCI).
  • the uplink control information includes downlink channel state information (Channel State Information: CSI) and a scheduling request (Scheduling Request: used to request PUSCH (Uplink-Shared Channel: UL-SCH) resources for initial transmission).
  • CSI Downlink Channel State Information
  • SR scheduling request
  • downlink data Transport block, Medium Access Control Protocol Data Unit: MAC PDU
  • Downlink-Shared Channel: DL-SCH, Physical Downlink-HardBandQRHD peat request ACKnowledgement).
  • HARQ-ACK indicates ACK (acknowledgement) or NACK (negative-acknowledgement).
  • HARQ-ACK is also referred to as HARQ feedback, HARQ information, HARQ control information, and ACK / NACK.
  • the PUSCH is used to transmit uplink data (Uplink-Shared Channel: UL-SCH).
  • the PUSCH may be used to transmit HARQ-ACK and / or channel state information along with uplink data. Also, the PUSCH may be used to transmit only channel state information or only HARQ-ACK and channel state information.
  • the PUSCH is used for transmitting the random access message 3.
  • PRACH is used for transmitting a random access preamble (random access message 1).
  • PRACH indicates initial connection establishment (initial connection establishment) procedure, handover procedure, connection re-establishment procedure, synchronization for uplink transmission (timing adjustment), and PUSCH (UL-SCH) resource request Used for.
  • Uplink physical signals are used in uplink wireless communication.
  • Uplink physical signals are not used to transmit information output from higher layers, but are used by the physical layer.
  • -Uplink reference signal (UL RS)
  • DMRS Demodulation Reference Signal
  • SRS Sounding Reference Signal
  • DMRS is related to transmission of PUSCH or PUCCH.
  • DMRS is time-multiplexed with PUSCH or PUCCH.
  • the base station apparatus 3 uses DMRS to perform propagation channel correction for PUSCH or PUCCH.
  • transmitting both PUSCH and DMRS is simply referred to as transmitting PUSCH.
  • transmitting both PUCCH and DMRS is simply referred to as transmitting PUCCH.
  • SRS is not related to PUSCH or PUCCH transmission.
  • the base station apparatus 3 may use SRS for measuring the channel state.
  • the SRS is transmitted in the last SC-FDMA symbol in the uplink subframe or the SC-FDMA symbol in UpPTS.
  • the following downlink physical channels are used in downlink wireless communication from the base station apparatus 3 to the terminal apparatus 2.
  • the downlink physical channel is used by the physical layer to transmit information output from the higher layer.
  • PBCH Physical Broadcast Channel
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid autorepeat request Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PMCH Physical Multicast Channel
  • the PBCH is used to broadcast a master information block (Master Information Block: MIB, Broadcast Channel: BCH) that is commonly used in the terminal device 2.
  • SFN system frame number
  • MIB is system information. For example, the MIB includes information indicating SFN.
  • PCFICH is used for transmitting information indicating a region (OFDM symbol) used for transmission of PDCCH.
  • PHICH is used to transmit a HARQ indicator for uplink data (Uplink Shared Channel: UL-SCH) received by the base station apparatus 3.
  • the HARQ indicator indicates HARQ-ACK.
  • the PDCCH and EPDCCH are used to transmit downlink control information (DCI).
  • DCI downlink control information
  • the downlink control information is also referred to as a DCI format.
  • the downlink control information includes a downlink grant and an uplink grant.
  • the downlink grant is also referred to as a downlink assignment or a downlink allocation.
  • One downlink grant is used for scheduling one PDSCH in one serving cell.
  • the downlink grant is used for scheduling the PDSCH in the same subframe as the subframe in which the downlink grant is transmitted.
  • One uplink grant is used for scheduling one PUSCH in one serving cell.
  • the uplink grant is used for scheduling PUSCH in a subframe that is four or more times after the subframe in which the uplink grant is transmitted.
  • the uplink grant transmitted on PDCCH includes DCI format 0.
  • the PUSCH transmission method corresponding to DCI format 0 is a single antenna port.
  • the terminal device 2 uses a single antenna port transmission scheme for PUSCH transmission corresponding to DCI format 0.
  • the PUSCH to which the single antenna port transmission scheme is applied is used for transmission of one codeword (one transport block).
  • the uplink grant transmitted on the PDCCH includes DCI format 4.
  • the transmission scheme of PUSCH corresponding to DCI format 4 is closed loop spatial multiplexing.
  • the terminal device 2 uses a closed-loop spatial multiplexing transmission scheme for PUSCH transmission corresponding to the DCI format 4.
  • the PUSCH to which the closed-loop spatial multiplexing transmission scheme is applied is used for transmission of up to two codewords (up to two transport blocks).
  • the CRC parity bits added to the downlink grant or uplink grant are C-RNTI (Cell-Radio Network Temporary Identifier), Temporary C-RNTI, SPS (Semi Persistent Scheduling) C-RNTirCWR Identified).
  • C-RNTI and SPS C-RNTI are identifiers for identifying a terminal device in a cell.
  • Temporary C-RNTI is used in contention based random access procedures.
  • the C-RNTI is used to control PDSCH or PUSCH in one subframe.
  • the SPS C-RNTI is used to periodically allocate PDSCH or PUSCH resources.
  • the Temporary C-RNTI is used to schedule retransmission of the random access message 3 and transmission of the random access message 4.
  • PDSCH is used to transmit downlink data (Downlink Shared Channel: DL-SCH).
  • the PDSCH is used to transmit a random access message 2 (random access response).
  • the PDSCH is used for transmitting a handover command.
  • the random access response includes a RAR grant (Random Access Response grant).
  • the RAR grant is an uplink grant transmitted on the PDSCH.
  • the terminal device 2 uses the single antenna port transmission scheme for PUSCH transmission corresponding to the RAR grant and for the PUSCH retransmission for the same transport block.
  • PMCH is used to transmit multicast data (Multicast Channel: MCH).
  • the downlink physical signal is not used to transmit information output from the upper layer, but is used by the physical layer.
  • SS Synchronization signal
  • DL RS Downlink reference signal
  • the synchronization signal is used for the terminal device 2 to synchronize the downlink frequency domain and time domain.
  • the synchronization signal includes PSS (Primary Synchronization Signal) and SSS (Second Synchronization Signal).
  • the downlink reference signal is used for the terminal device 2 to correct the propagation path of the downlink physical channel.
  • the downlink reference signal is used for the terminal device 2 to calculate downlink channel state information.
  • CRS Cell-specific Reference Signal
  • PDSCH UE-specific Reference Signal
  • DMRS Demodulation Reference Signal
  • EPDCCH Non-Zero Power Channel State Information-Reference Signal
  • ZP CSI-RS Zero Power Channel State Information-Reference Signal
  • MBSFN RS Multimedia Broadcast and Multicast Service over Single Frequency Network Reference Signal
  • PRS Positioning Reference Signal
  • the downlink physical channel and the downlink physical signal are collectively referred to as a downlink signal.
  • the uplink physical channel and the uplink physical signal are collectively referred to as an uplink signal.
  • the downlink physical channel and the uplink physical channel are collectively referred to as a physical channel.
  • the downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.
  • BCH, MCH, UL-SCH and DL-SCH are transport channels.
  • a channel used in the medium access control (Medium Access Control: MAC) layer is referred to as a transport channel.
  • a transport channel unit used in the MAC layer is also referred to as a transport block (TB) or a MAC PDU (Protocol Data Unit).
  • HARQ Hybrid Automatic Repeat? ReQuest
  • the transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to a code word, and an encoding process is performed for each code word.
  • the base station device 3 and the terminal device 2 exchange (transmit / receive) signals in an upper layer (high layer).
  • the base station device 3 and the terminal device 2 receive and transmit RRC signaling (RRC message: Radio Resource Control, RRC information: Radio Resource Control) in the radio resource control (RRC: Radio Resource Control) layer. May be.
  • RRC signaling RRC message: Radio Resource Control
  • RRC information Radio Resource Control
  • the base station device 3 and the terminal device 2 may transmit and receive MAC CE (Control Element) in a medium access control (MAC) layer.
  • MAC CE Medium access control
  • RRC signaling and / or MAC CE are also referred to as higher layer signaling.
  • the PUSCH and PDSCH are used to transmit RRC signaling and MAC CE.
  • the RRC signaling transmitted by the PDSCH from the base station apparatus 3 may be common signaling for a plurality of terminal apparatuses 2 in the cell.
  • the RRC signaling transmitted from the base station device 3 on the PDSCH may be dedicated signaling (also referred to as dedicated signaling or UE specific signaling) to a certain terminal device 2.
  • the cell specific parameter may be transmitted using common signaling for a plurality of terminal devices 2 in the cell or dedicated signaling for a certain terminal device 2.
  • the UE specific parameter may be transmitted to a certain terminal device 2 using dedicated signaling.
  • the wireless network of this embodiment will be described.
  • the communicable range (communication area) of each frequency controlled by the base station apparatus 3 is regarded as a cell.
  • the communication area covered by the base station apparatus 3 may have a different width and a different shape for each frequency.
  • the area to cover may differ for every frequency.
  • a wireless network in which cells having different types of base station apparatuses 3 and different cell radii are mixed in the same frequency or different frequency areas to form one communication system is referred to as a heterogeneous network. Called.
  • the terminal device 2 operates by regarding the inside of the cell as a communication area.
  • the terminal device 2 moves from one cell to another cell, it is a cell reselection procedure at the time of non-wireless connection (also referred to as an idle state or RRC_IDLE state), and at the time of wireless connection (also referred to as a connected state or RRC_CONNECTED state).
  • RRC_IDLE state also referred to as an idle state or RRC_IDLE state
  • RRC_CONNECTED state also referred to as a connected state or RRC_CONNECTED state
  • An appropriate cell is a cell that is generally determined that access of the terminal device 2 is not prohibited based on information specified by the base station device 3, and the downlink reception quality is a predetermined condition. Indicates a cell that satisfies.
  • the base station device 3 manages a cell, which is an area where the terminal device 2 can communicate, for each frequency.
  • One base station apparatus 3 may manage a plurality of cells.
  • a cell set to be used for communication with the terminal device 2 among the cells of the base station device 3 is a serving cell (Serving cell).
  • the cells that are not used for other communications are referred to as neighboring cells (Neighboring cells).
  • FIG. 4 is a diagram showing a user plane (UP (User-plane, U-Plane)) protocol stack for handling user data of the terminal device 2 and the base station device 3 of the EUTRA radio network (EUTRAN).
  • FIG. 5 is a diagram illustrating a control plane (CP (Control-plane, C-Plane)) protocol stack that handles control data.
  • UP User-plane, U-Plane
  • CP Control-plane, C-Plane
  • the physical layer (Physical layer: PHY layer) provides a transmission service to an upper layer using a physical channel (Physical Channel).
  • the PHY layer is connected to an upper medium access control layer (Medium Access Control layer: MAC layer) by a transport channel.
  • Data moves between the MAC layer, the PHY layer, and the layer (layer) via the transport channel.
  • Data transmission / reception is performed between the PHY layers of the terminal device 2 and the base station device 3 via a physical channel.
  • the MAC layer maps various logical channels to various transport channels.
  • the MAC layer is connected to an upper radio link control layer (Radio Link Control layer: RLC layer) through a logical channel.
  • the logical channel is roughly classified according to the type of information to be transmitted, and is divided into a control channel for transmitting control information and a traffic channel for transmitting user information.
  • the MAC layer has a function of controlling the PHY layer to perform intermittent transmission / reception (DRX / DTX), a function of executing a random access procedure, a function of notifying information of transmission power, a function of performing HARQ control, and the like.
  • the RLC layer divides the data received from the upper layer (Segmentation) and combines (Concatenation), and adjusts the data size so that the lower layer can transmit data appropriately.
  • the RLC layer also has a function for guaranteeing the QoS (Quality of Service) required by each data. That is, the RLC layer has functions such as data retransmission control.
  • the packet data convergence protocol layer (Packet Data Convergence Protocol layer: PDCP layer) has a header compression function that compresses unnecessary control information in order to efficiently transmit IP packets as user data in a wireless section.
  • the PDCP layer also has a data encryption function.
  • the control plane protocol stack includes a radio resource control layer (Radio Resource Control layer: RRC layer).
  • RRC layer sets and reconfigures a radio bearer (RB), and controls a logical channel, a transport channel, and a physical channel.
  • the RB is divided into a signaling radio bearer (Signaling Radio Bearer: SRB) and a data radio bearer (Data Radio Bearer: DRB), and the SRB is used as a path for transmitting an RRC message as control information.
  • DRB is used as a route for transmitting user data.
  • Each RB is set between the RRC layers of the base station device 3 and the terminal device 2.
  • the PHY layer corresponds to the physical layer of the first layer in the hierarchical structure of an open system interconnection (OSI) model that is generally known, and the MAC layer, RLC layer, and PDCP layer are OSI.
  • the RRC layer corresponds to the data link layer, which is the second layer of the model, and the network layer, which is the third layer of the OSI model.
  • the signaling protocol used between the network and the terminal device 2 is divided into an access layer (Access Stratum: AS) protocol and a non-access layer (Non-Access Stratum: NAS) protocol.
  • AS access layer
  • the protocol below the RRC layer is an access layer protocol used between the terminal device 2 and the base station device 3.
  • Protocols such as connection management (CM) and mobility management (MM) of the terminal device 2 are non-access layer protocols and are used between the terminal device 2 and the core network (CN).
  • CM connection management
  • MM mobility management
  • CN core network
  • communication using a non-access layer protocol is transparently performed via the base station device 3 between the terminal device 2 and a mobile management entity (Mobility Management Entity: MME).
  • MME Mobile Management Entity
  • FIG. 9 is a sequence chart for explaining a radio resource management (RRM) measurement setting management method of the terminal device 2 and the base station device 3 in EUTRA.
  • RRM radio resource management
  • the base station apparatus 3 can use two different frequencies, F1 and F2, as frequencies operated by the own station, and the terminal apparatus 2 and the base station apparatus 3 are wirelessly connected at the frequency F1. It is an established state (Radio Resource Control Connection State (Radio Resource Control Connected: RRC_Connected)).
  • the base station apparatus 3 causes the terminal apparatus 2 to include a message including a measurement setting (hereinafter, a measurement setting message) in order to cause the terminal device 2 to measure the reception quality of the cell in communication (located cell) and other cells (neighboring cells). Is transmitted) (step S91).
  • the measurement setting message includes at least one measurement setting information for each frequency (frequency F1 and frequency F2) to be measured.
  • the measurement setting information includes a measurement ID, a measurement object (measurement object), a measurement object ID corresponding to the measurement object, a report setting including a measurement event, and a report setting ID corresponding to the report setting.
  • a plurality of report setting IDs may be linked to one measurement target ID.
  • a single report setting ID may be linked to a plurality of measurement target IDs.
  • the base station apparatus 3 assigns identifiers 0 and 1 as measurement object IDs to the frequency F1 and the frequency F2 as measurement objects, and notifies the terminal apparatus 2 of them. Further, the base station apparatus 3 assigns identifiers 0, 1 and 2 as report setting IDs to report setting 1, report setting 2 and report setting 3, respectively, and notifies the terminal apparatus 2 of the report settings. Furthermore, the base station apparatus 3 notifies the terminal apparatus 2 of a measurement ID linked (linked) to the combination of the measurement target identifier and the report setting identifier.
  • the combination of the measurement target (frequency F1) with identifier 0 and the report setting with identifier 0 is designated as measurement ID # 0.
  • the combination of the measurement target of identifier 0 (frequency F1) and the report setting of identifier 1 is designated as measurement ID # 1
  • the combination of measurement target of identifier 1 (frequency F2) and the report setting of identifier 2 is measured. It is specified as ID # 2.
  • the measurement event information is, for example, when the reception quality of the cell-specific reference signal of the serving cell is below / above a predetermined threshold, the reception quality of the cell-specific reference signal of the neighboring cell is higher than that of the serving cell. It is information composed of a measurement event indicating a condition such as when the reception quality of a neighboring cell exceeds a predetermined threshold when it falls below, and a parameter used to determine the condition. Information such as a threshold value, an offset value, and a time required for establishment of a measurement event is set in the parameter.
  • Non-Patent Document 3 defines, for example, that a measurement event A1 is reported when the reception quality of a serving cell becomes better than a threshold value.
  • measurement event A3 it is defined that reporting is performed when the reception quality of the neighboring cell becomes better than the reception quality of the serving cell plus the offset value.
  • measurement event A4 it is defined as measurement event A4 to report when the reception quality of an adjacent cell becomes better than a threshold value.
  • the terminal device 2 stores the measurement setting information set from the base station device 3 as internal information, and then starts the measurement process. Specifically, as described above, the terminal device 2 manages the measurement ID, the measurement target ID, and the report setting ID in association with each other so as to be linked to one, and performs measurement based on the measurement information corresponding to each ID. Start. If these three IDs are linked to one, consider it valid and start the associated measurement; if these three IDs are not linked to one (one of the IDs is not set) ), The relevant measurement is not started as invalid. If the measurement setting information can be set without error, the terminal device 2 transmits a message (measurement setting completion message) indicating the completion of measurement setting to the base station device 3 in step S93.
  • a message (measurement setting completion message) indicating the completion of measurement setting to the base station device 3 in step S93.
  • the terminal device 2 transmits a measurement report message to the base station device 3 assuming that the measurement event is triggered (trigger) (Ste S94).
  • the measurement report message at least the measurement ID linked to the report setting ID of the triggered measurement event and, if necessary, the measurement result of the associated cell are set and reported. Since the base station apparatus 3 knows to which measurement event report setting ID the measurement ID is linked, the terminal apparatus 2 does not need to notify the report setting ID in the measurement report message.
  • FIG. 8 is a diagram showing an example of a handover procedure (procedure) in the present embodiment.
  • Step S801 When necessary, the base station device 3A sets RRM measurement for the terminal device 2 and reports a handover candidate cell (base station device 3B).
  • the source base station device 3A determines the target base station device 3B based on the measurement result reported from the terminal device 2 and / or other criteria, and performs handover to the target base station device 3B.
  • a request (HANDOVER REQUEST) message is sent (Send).
  • the handover request message includes information necessary for preparation for handover.
  • the handover request message may include information indicating the type of handover.
  • the information indicating the type of handover is at least whether or not it is a type of handover in which communication in the source cell is continued even after receiving the handover command in step S805 (hereinafter referred to as connection maintenance type handover). It is desirable that the information can be determined.
  • the handover request message includes information (for example, part or all of the capability information of the terminal device 2) that can be used to determine in which band combination the terminal device 2 can perform connection maintenance handover. Also good.
  • Step S803 If the target base station 3B can accept the handover, the target base station 3B sends a handover request acknowledgment (HANDOVER REQUEST ACKNOWLEDGE) message including the handover command to the source base station apparatus 3A.
  • the handover command is an RRC connection reconfiguration message including mobility control information (mobilityControlInfo) as a parameter.
  • mobilityControlInfo may include information indicating the type of handover and information regarding the target cell.
  • the information on the target cell may include information for indicating the target cell's PCI (Physical layer Cell Indentity) and information for indicating the frequency of the target cell. Note that, in a situation where the handover cannot be accepted in step S803, a handover preparation failure (HANDOVER PREPARATION FAILURE) message may be sent to the source base station apparatus 3A and the subsequent steps may not be performed.
  • HANDOVER PREPARATION FAILURE a handover preparation failure
  • Step S804 The source base station apparatus 3A transmits the handover command (RRC connection reconfiguration message) received from the source base station apparatus 3A to the terminal apparatus 2 using the PDSCH.
  • Step S805 The terminal device 2 that has received a valid handover command from the source base station device 3A terminates communication in the source cell when the handover type is a conventional handover, and the target in Step S806 described later Synchronize with the cell. Further, when the type of handover is a connection maintenance type handover, synchronization with the target cell is achieved in step S806 described later while communication in the source cell is continued.
  • the terminal device 2 that has received the handover command resets the MAC layer when starting downlink synchronization to the target cell, and re-establishes the PDCP layer and the RLC layer.
  • the MAC layer is not reset and the PDCP layer and the RLC layer are not re-established.
  • the MAC layer used for communication with the source cell may be reset after the uplink resource is allocated in the target cell, or an RRC connection reconfiguration complete message to the target cell may be sent. You may make it perform after transmitting.
  • a part of the following processes (A) to (D) may be performed after receiving the RRC connection reconfiguration message including the parameter mobilityControlInfo.
  • information indicating which process is to be performed may be included in the RRC connection reconfiguration message including the parameter mobilityControlInfo.
  • C Do not reset the MAC layer of MCG and SCG.
  • D Do not reestablish the PDCP layer and RLC layer of MCG and SCG.
  • Step S806 The terminal device 2 acquires the downlink synchronization of the target cell based on the information related to the target cell, and acquires the uplink synchronization of the target cell by random access processing or other synchronization processing in the target cell.
  • Step S807 the terminal apparatus 2 acquires PUSCH transmission resources and transmits uplink data in the random access process of Step S806.
  • the uplink data may include an RRC connection reconfiguration completion message.
  • Step S808 The terminal device 2 that has transmitted the RRC connection reconfiguration completion message ends the communication in the source cell, resets each function of the MAC layer if necessary, and sets the PDCP layer between the target cell and the target cell.
  • the RLC layer may be reestablished.
  • Step S809 The target base station apparatus 3B that has received the RRC connection reconfiguration completion message from the terminal apparatus 2 sends a handover execution (Handover Execution) message to the source base station apparatus 3A.
  • the handover execution message is a message indicating that an RRC connection reconfiguration completion message has been received from the terminal device 2.
  • Step S810 The source base station device 3A that has received the handover execution message from the base station device 3B targets the PDCP SN (PDCP Sequence Number) and HFN (Hyper Frame Number) of the uplink and downlink to the terminal device 2. Transfer to the base station apparatus 3B.
  • PDCP SN and HFN are state variables used for concealment / decryption processing and header compression processing in the PDCP layer.
  • Step S811) Furthermore, the source base station apparatus 3A transfers downlink data that has not been transmitted to the terminal apparatus 2 to the target base station apparatus 3B.
  • Step S812 The target base station device 3B transmits the downlink data transferred from the source base station device 3A to the terminal device 2.
  • the base station apparatus 3B may include information on data that has been successfully received last in communication in the source cell in the handover execution message in step S809. As a result, the base station device 3A can transfer only data that the terminal device 2 has not yet received in step S811.
  • the radio link monitoring (RLM: Radio Link Monitoring) of this embodiment will be described.
  • Radio Link Failure An example of an operation in which the terminal device 2 connected by RRC detects a radio link failure (Radio Link Failure) will be described.
  • the terminal device 2 in the RRC_IDLE state in which the RRC connection is not established receives broadcast information from the base station device 3 that is in the area (step S171).
  • the broadcast information includes various parameters related to system information and RRC connection establishment.
  • parameters related to RRC connection establishment include timer T310 for detecting PCell physical layer problems (Physical layer problems), timer T311 indicating a period during which RRC connection re-establishment processing can be performed, and out-of-sync ) N310 which is a threshold of the number of times of detection, N311 which is a threshold of the number of times of detection of synchronization (in sync), and the like.
  • step S172 the terminal device 2 establishes an RRC connection with the base station device 3, transitions to the RRC_CONNECTED state, starts communication, and starts radio link monitoring (step S173).
  • step S174 when the terminal apparatus 2 detects that the terminal apparatus 2 has lost synchronization with the base station apparatus 3 N310 times continuously due to radio quality degradation or the like during communication, the terminal apparatus 2 starts measuring the timer T310 (step S175).
  • step S176 when the synchronization (in sync) is detected N311 times before the timer T310 expires, the terminal device 2 determines that the wireless quality deterioration state has been recovered, and stops the timer T310 (step S176). S178), communication is continued, and radio link monitoring is continued (transition to step S173).
  • the terminal apparatus 2 detects a radio link failure (Radio Link Failure) in step S179.
  • the operation after the detection of the radio link failure differs in the operation of the terminal device 2 according to the AS Security establishment state.
  • AS Security has not been established
  • the terminal device 2 transitions to the RRC IDLE state, and when AS Security has already been established, the terminal device 2 executes a procedure for re-establishing an RRC connection (RRC Connection Re-establishment).
  • the timer state is the state in which the timer is stopped (the state before starting), the timer is timed (running), and the set time has elapsed without stopping by the set time It may have a state (Expire state).
  • the radio link monitoring (RLM: Radio Link Monitoring) of the source cell at the time of the connection maintenance type handover of this embodiment will be described.
  • the terminal device 2 that has received a valid handover command from the source base station device 3A includes a parameter t304 indicating a value set in the timer T304 indicating a period during which the handover process can be executed, in the handover command
  • the value of the t304 is set in the timer T304, and the timer is started.
  • any of the following processes (A) to (C) may be performed.
  • (A) When the timer (T310) that times out of synchronization in communication with the source base station device 3A is counting, it continues without stopping the timer.
  • the terminal apparatus 2 When a loss of synchronization with the base station apparatus 3A is detected N310 times consecutively due to radio quality degradation of the source cell or the like during the connection maintenance handover, the terminal apparatus 2 starts measuring the timer T310. After that, when synchronization (in sync) is detected N311 times consecutively before the expiration of the timer T310, the terminal device 2 determines that the wireless quality deterioration state has been recovered, stops the timer T310, and continues communication.
  • the terminal device 2 when the synchronization (in sync) cannot be detected N311 times continuously by the expiration of the timer T310, the terminal device 2 does not transition to the RRC IDLE state or re-establish the RRC connection, and the source cell Record that the radio link has failed (or timer T310 has expired).
  • (B) Suspend start / stop / time processing of a timer (T310) that times out of synchronization in communication with the source base station apparatus 3A.
  • the terminal device 2 does not start the time measurement of the timer T310 even if the synchronization with the base station device 3A is detected N310 times consecutively due to the radio quality degradation of the source cell. Alternatively, out of synchronization is not detected.
  • (C) Suspend start / stop / time processing of a timer (T310) that times out of synchronization in communication with the source base station apparatus 3A. If a loss of synchronization with the base station apparatus 3A is detected N310 times consecutively due to radio quality deterioration of the source cell or the like during the connection maintenance handover, the terminal apparatus 2 starts measuring a timer T31x different from the timer T310. Thereafter, when synchronization (in sync) is detected N311 times consecutively before the expiration of the timer T31x, the terminal device 2 determines that the wireless quality deterioration state has been recovered, stops the timer T310, and continues communication.
  • T310 timer
  • the terminal device 2 records that the source cell is in a radio link failure state (or the timer T31x expires). To do.
  • the value set in the timer T31x is desirably larger than the maximum value that can be set in T310.
  • T31x may be set to infinity.
  • the terminal device 2 When the handover to the target cell is not normally completed before the timer T304 expires, the terminal device 2 performs the following process (A ′) corresponding to the above processes (A) to (C) when the timer T304 expires. ) To (C ′) may be performed.
  • a ′ When the source cell is not in a radio link failure state (timer T310 is not expired), the source cell is notified of the failure of the handover to the target cell. On the other hand, if the source cell is in a radio link failure state (timer T310 has expired), the RRC connection re-establishment procedure is started.
  • the cell connection re-establishment procedure is executed.
  • the continuation may be counted.
  • C ′ The timer (T310) that has been paused is resumed (resume).
  • the timer T31x is stopped, the failure of the handover to the target cell is notified to the source cell.
  • the timer T31x is timing or has expired, the cell connection re-establishment procedure is executed. That is, when the radio link monitoring by the timer T31x in the source cell cannot notify the source cell of the failure of the handover to the target cell due to the radio link failure, the cell connection re-establishment procedure is executed.
  • the timer T304 in order to suppress the change to the conventional process (execution of the RRC connection re-establishment procedure, etc.) due to the expiration of the timer T304, instead of the timer T304, another timer independent of the timer T304 is used at the time of connection maintenance handover. May be used to determine a handover failure.
  • the value of t304 included in the handover command may be set as the value of the timer, or a value notified by other parameters may be set.
  • the terminal device 2 cannot follow some or all of the settings included in the RRC connection reconfiguration message notified from the base station device 3, and the security of the AS layer is in an activated state (Activated) Or when the radio link fails ((1) when the timer T310 that starts timing when a problem in the physical layer is detected expires, (2) is set at the time of measurement, and the measurement report is triggered during the timer T310 timing.
  • the timer T312 that starts timing when the timer expires
  • the clock is opened when an RRC connection reconfiguration message containing control information is received.
  • the RRC connection re-establishment succeeds only when the cell (the base station apparatus 3) to which the connection is attempted is ready (has a valid terminal apparatus 2 context). However, it is also possible for the base station device 3 that does not have the context of the terminal device 2 to successfully re-establish the RRC connection by acquiring a valid context from the base station device 3 that has the context of the terminal device 2. It becomes.
  • the terminal device 2 stops timing and starts timing of the timer T311.
  • the radio bearers other than SRB0 are suspended (Suspend).
  • the MAC layer is reset, and a default setting is applied to the MAC layer and the physical layer to start a cell selection procedure.
  • the terminal device 2 stops the timer T311 and starts measuring the timer T301. In the selected cell, the terminal device 2 sends a connection re-establishment request message to the base station device 3. Send.
  • the connection re-establishment request message includes information indicating the reason for re-establishing the RRC connection (reconfiguration failure, handover failure, other failure, etc.).
  • the terminal device 2 When the terminal device 2 that has transmitted the RRC connection re-establishment request message receives the RRC connection re-establishment message from the base station device 3, the terminal device 2 stops the timer T301 and re-establishes the PDCP and RLC of the SRB1. Further, the wireless resource is set, and the suspended SRB 1 is resumed. Then, concealment (integrity) and encryption (ciphering) are performed using the settings before the RRC connection re-establishment is performed, and when the processing is normally completed, an RRC re-establishment completion message is notified to the base station apparatus 3 .
  • the timer T311 expires, the RRC connection fails, and the terminal device 2 transitions from the connected state to the idle state.
  • the timer T301 expires or the selected optimal cell does not satisfy the cell selection criteria, the RRC connection fails, and the terminal device 2 changes from the connected state to the idle state. Transition to.
  • the terminal device 2 may be set with a plurality of serving cells in communication with the base station device 3.
  • a technique in which the terminal device 2 communicates with the base station device 3 via a plurality of serving cells is referred to as cell aggregation or carrier aggregation.
  • carrier aggregation a plurality of set serving cells are also referred to as aggregated serving cells.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • TDD may be applied to all of a plurality of serving cells.
  • a serving cell to which TDD is applied and a serving cell to which FDD is applied may be aggregated.
  • a serving cell to which TDD is applied is also referred to as a TDD serving cell.
  • the plurality of set serving cells include one primary cell and one or more secondary cells.
  • the primary cell is a serving cell in which an initial connection establishment procedure has been performed, a serving cell that has started a connection re-establishment procedure, or a cell designated as a primary cell in a handover procedure.
  • a secondary cell may be set when an RRC (Radio Resource Control) connection is established or after.
  • the primary cell includes a source primary cell and a target primary cell.
  • a carrier corresponding to a serving cell is referred to as a downlink component carrier.
  • a carrier corresponding to a serving cell is referred to as an uplink component carrier.
  • the downlink component carrier and the uplink component carrier are collectively referred to as a component carrier.
  • the terminal device 2 can simultaneously transmit a plurality of physical channels / a plurality of physical signals in a plurality of serving cells (component carriers) to be aggregated.
  • the terminal device 2 can simultaneously receive a plurality of physical channels / a plurality of physical signals in a plurality of serving cells (component carriers) to be aggregated.
  • the serving cell state includes a state where the cell is activated (Activated state) and a state where the cell is deactivated (Deactivated state).
  • the primary cell is not subject to activation and deactivation control (that is, the primary cell is considered to be activated), but the secondary cell is called activation and deactivation. It has cell status according to activity.
  • the terminal device 2 may be set with a plurality of serving cells in communication with the plurality of base station devices 3.
  • a technique in which the terminal device 2 communicates with a plurality of base station devices 3 via a plurality of serving cells is referred to as dual connectivity.
  • one base station apparatus 3 manages a plurality of cells, and one base station apparatus 3 can perform centralized control for each cell, and the backbone line between the plurality of cells is affected by delay. It is different from the connection by dual connectivity that there is no need to consider.
  • carrier aggregation is a technique for connecting one terminal apparatus 2 and one base station apparatus 3 via a plurality of cells, whereas dual connectivity is one terminal apparatus 2 and a plurality of base stations. This is a technology for connecting the station apparatus 3 via a plurality of cells.
  • MCG Master eNB Cell Group
  • SCG Secondary eNB Cell Group
  • the terminal device and the base station device can apply the technology applied to carrier aggregation to dual connectivity.
  • the terminal device 2 and the base station device 3 connect technologies such as primary cell and secondary cell management (addition, deletion, change, etc.), RRM measurement corresponding to carrier aggregation, activation / deactivation, etc. by dual connectivity. It may be applied to a cell to be processed.
  • the primary cell is not subject to activation and deactivation control in carrier aggregation, but in dual connectivity, the primary cell of the MCG and one of the SCGs The cell (referred to as PSCell) is excluded from the control of activation and deactivation.
  • carrier aggregation uses a user-plane protocol stack with each layer as shown in FIG. 4, but dual connectivity uses a protocol stack in which the RLC layer and below are separated for each cell group. It is done. Therefore, one base station apparatus 3 may be connected to the terminal apparatus 2 by dual connectivity using a plurality of protocol stacks.
  • the physical uplink control channel PUCCH is a downlink data response (ACK / NACK) transmitted on the physical downlink shared channel PDSCH, downlink radio channel quality information (Channel Quality Indicator: CQI), and an uplink data transmission request. (Scheduling Request (SR)) is used for transmission.
  • the scheduling request is transmitted to the base station apparatus 3 using the physical uplink control channel PUCCH allocated from the base station apparatus 3.
  • the uplink resource is requested by the random access procedure.
  • the random access procedure includes two access procedures: a contention based random access procedure (Contention based Random Access procedure) and a non-contention based random access procedure (Non contention based Random Access procedure).
  • a contention based random access procedure Contention based Random Access procedure
  • Non contention based Random Access procedure Non contention based Random Access procedure
  • the contention-based random access procedure is a random access procedure that may collide between the terminal devices 2, and at the time of initial access from a state where the base station device 3 is not connected (communication) or being connected to the base station device 3. However, this is performed for a scheduling request or the like when uplink data transmission occurs in the terminal device 2 in a state where uplink synchronization is lost.
  • the non-contention based random access procedure is a random access procedure in which no collision occurs between the terminal devices 2, and the base station device 3 and the terminal device 2 are connected, but quickly when the uplink is out of synchronization.
  • the terminal apparatus 2 In order to establish uplink synchronization between the terminal apparatus 2 and the base station apparatus 3, the terminal apparatus 2 is instructed by the base station apparatus 3 in a special case such as a handover or when the transmission timing of the terminal apparatus 2 is not effective. Start the access procedure.
  • the non-contention based random access procedure is instructed by an RRC (Radio Resource Control: Layer 3) layer message and control data of the physical downlink control channel PDCCH.
  • RRC Radio Resource Control: Layer 3
  • the terminal device 2 transmits a random access preamble to the base station device 3 (message 1: (1), step S61). Then, the base station device 3 that has received the random access preamble transmits a response to the random access preamble (random access response) to the terminal device 2 (message 2: (2), step S62). The terminal device 2 transmits an upper layer (Layer2 / Layer3) message based on the scheduling information included in the random access response (message 3: (3), step S63). The base station apparatus 3 transmits a collision confirmation message to the terminal apparatus 2 that has received the upper layer message of (3) (message 4: (4), step S64). Note that contention-based random access is also referred to as random preamble transmission.
  • the base station apparatus 3 notifies the terminal apparatus 2 of a preamble number (or sequence number) and a random access channel number to be used (message 0: (1) ′, step S71).
  • the terminal device 2 transmits the random access preamble of the designated preamble number to the designated random access channel RACH (message 1: (2) ′, step S72).
  • the base station device 3 that has received the random access preamble transmits a response to the random access preamble (random access response) to the terminal device 2 (message 2: (3) ′, step S73).
  • the notified preamble number value is 0, a contention based random access procedure is performed.
  • the non-contention based random access procedure is also referred to as dedicated preamble transmission.
  • the function of the wireless transmission / reception unit 20 is different for each terminal device 2. That is, combinations of bands (carriers and frequencies) to which carrier aggregation can be applied are different for each terminal device 2. Therefore, the terminal device 2 notifies the base station device 3 of RF-Parameters-v1020, which is information / parameter indicating a band combination to which carrier aggregation can be applied.
  • a band to which carrier aggregation can be applied is also referred to as a CA band.
  • a band to which carrier aggregation is not applicable or a band to which carrier aggregation is applicable but carrier aggregation is not applied is also referred to as a non-CA band.
  • FIG. 11 is a diagram showing information / parameters included in the RF-Parameters-v1020 of the present embodiment.
  • RF-Parameters-v1020 includes one SupportedBandCombination-r10.
  • the SupportedBandCombination-r10 includes one or a plurality of BandCombinationParameters-r10.
  • SupportedBandCombination-r10 includes supported CA band combinations and supported non-CA bands.
  • BandCombinationParameters-r10 includes one or a plurality of BandParameters-r10.
  • One Band Combination Parameter-r10 indicates a combination of supported CA bands or a supported non-CA band. For example, when a plurality of BandParameters-r10 are included in BandCombinationParameters-r10, communication using carrier aggregation in a combination of CA bands indicated by the plurality of BandParameters-r10 is supported. In addition, when one BandParameters-r10 is included in the BandCombinationParameters-r10, communication in a band (non-CA band) indicated by the one BandParameters-r10 is supported.
  • FIG. 12 is a diagram showing information / parameters included in the BandParameters-r10 of the present embodiment.
  • BandParameters-r10 includes bandEUTRA-r10, bandParametersUL-r10, and bandParametersDL-r10.
  • BandEUTRA-r10 includes FreqBandIndicator.
  • FreqBandIndicator indicates a band.
  • the bandParametersUL-r10 is not included in the BandParameters-r10.
  • the bandParametersDL-r10 is not included in the BandParameters-r10.
  • the bandParametersUL-r10 includes one or a plurality of CA-MIMO-ParametersUL-r10.
  • CA-MIMO-ParametersUL-r10 includes ca-BandwidthClassUL-r10 and supported MIMO-CapabilityUL-r10.
  • the ca-BandwidthClassUL-r10 includes CA-BandwidthClass-r10.
  • Supported MIMO-CapabilityUL-r10 indicates the number of layers supported for spatial multiplexing in the uplink. When spatial multiplexing is not supported in the uplink, the supported MIMO-CapabilityUL-r10 is not included in the CA-MIMO-ParametersUL-r10.
  • the bandParametersDL-r10 includes one or a plurality of CA-MIMO-ParametersDL-r10.
  • CA-MIMO-ParametersDL-r10 includes ca-BandwidthClassDL-r10 and supported MIMO-CapabilityDL-r10.
  • the ca-BandwidthClassDL-r10 includes CA-BandwidthClass-r10.
  • Supported MIMO-Capability DL-r10 indicates the number of layers supported by spatial multiplexing in the downlink.
  • the supported MIMO-Capability UL-r10 is not included in the CA-MIMO-Parameters DL-r10.
  • CA-BandwidthClass-r10 indicates a CA bandwidth class supported by the terminal device 2 in the uplink or the downlink.
  • CA-BandwidthClassUL-r10 corresponds to the CA bandwidth class supported by the terminal device 2 in the uplink.
  • CA-BandwidthClassDL-r10 corresponds to the CA bandwidth class supported by the terminal device 2 in the downlink.
  • the CA bandwidth class is defined by the number of cells that can be set simultaneously by the terminal apparatus 2 in the band indicated by the FreqBandIndicator, the total bandwidth of the cells set simultaneously in the band indicated by the FreqBandIndicator, and the like. For example, CA bandwidth class a indicates that one cell of 20 MHz or less can be set.
  • FIG. 13 is a diagram illustrating an example of the RF-Parameters-v1020 of the present embodiment.
  • RF-Parameters-v1020 includes one SupportedBandCombination-r10.
  • the supported band combination-r10 includes one or a plurality of band combination parameters-r10.
  • the Band Combination Parameters-r10 includes one or a plurality of Band Parameters-r10.
  • Band Combination Parameters-r10 indicates that one cell can transmit in the uplink in Band A, and one cell in Band A can transmit in the downlink. That is, Band Combination Parameters-r10 of BCP 13100 indicates that Band A supports one cell. In addition, Band Combination Parameters-r10 of BCP 13100 indicates that two layers are supported for spatial multiplexing in the Band A downlink. In addition, Band Combination Parameters-r10 of BCP 13100 indicates that spatial multiplexing is not supported in the uplink of Band A.
  • Band Combination Parameters-r10 of BCP13300 can transmit in the uplink in one cell in Band A, can transmit in the downlink in one cell in Band A, and transmit in the downlink in one cell in Band B Indicates that it is possible.
  • Band Combination Parameters-r10 of BCP 13100 indicates that a combination of one primary cell in Band A and one secondary cell without an uplink in Band B is supported.
  • Band Combination Parameters-r10 of BCP 13300 indicates that spatial multiplexing in the Band A downlink, spatial multiplexing in the Band B downlink, and spatial multiplexing in the Band A uplink are not supported.
  • FIG. 14 is a diagram showing information / parameters included in the RF-Parameters-v 1250 of the present embodiment.
  • one supportedBandListE-UTRA-v1250 one supportedBandCombination-v1250, one supportedBandCombinationAdd-v1250, one FreqBandPriorityAdjust may be included.
  • the supportedBandListE-UTRA-v1250 may include one or more supportedBandE-UTRA-v1250.
  • SupportedBandE-UTRA-v1250 may include information indicating whether 256QAM reception is supported on the downlink or 64QAM transmission is supported on the uplink, for each band supported by the terminal apparatus 2.
  • SupportedBandListE-UTRA included in RF-Parameters (which is a parameter including RF-Parameters-v1250).
  • the order of SupportedBandE-UTRA-v1250 included in supportedBandListE-UTRA-v1250 and the band order indicated by SupportedBandListE-UTRA correspond one-to-one.
  • the supportedBandCombination-v1250 and the supportedBandCombinationAdd-v1250 may include BandCombinationParameters-v1250 for each band combination supported by the terminal device 2.
  • BandCombinationParameters-v1250 may include dc-Support-r12, which is information related to dual connectivity.
  • dc-Support-r12 is included in Band Combination Parameters-v 1250, it indicates that the terminal device 2 supports synchronous dual connectivity in which at least MCG and SCG are synchronized.
  • dc-Support-r12 is included for a combination of bands including only one band, it indicates that dual connectivity using continuous bands in the band is supported.
  • the terminal device 2 indicates that the MCG and the SCG support asynchronous dual connectivity.
  • the terminal device 2 is statically set as a system parameter in the terminal device 2 such as a nonvolatile memory.
  • the terminal device capability is configured based on the capability information of the terminal device 2 and connected to the base station device 3 or a terminal device capability message including the terminal device capability is received in response to a request from the base station device 3 as an RRC message. As shown in FIG.
  • the base station device 3 transmits a message (UECapabilityEnquiry) requesting notification of terminal device capability to the terminal device 2 (step S161).
  • the terminal device 2 transmits an RRC message (UECapabilityInformation) including information on the terminal device capability to the base station device 3 based on the information included in the UECapabilityEnquiry (step S162).
  • UECapabilityInformation information related to a connection maintenance type handover described later may be included in UECapabilityInformation and transmitted.
  • the base station device 3 receives the terminal device capability message, and can appropriately set a component carrier (cell) for the terminal device 2 based on the notified terminal device capability.
  • the terminal device capability notification method related to the connection maintenance type handover of this embodiment will be described.
  • the terminal apparatus 2 notifies the base station apparatus 3 of RF-Parameters-rX, which is information / parameter indicating a band combination to which the connection maintaining handover can be applied.
  • FIG. 15 is a diagram illustrating an example of information / parameters included in the RF-Parameters-rX of the present embodiment.
  • the RF-Parameters-rX includes one Supported Band Combination-rX.
  • the SupportedBandCombination-rX may include BandCombinationParameters-rX for each combination of bands supported by the terminal device 2.
  • BandCombinationParameters-rX may include a parameter (cmho-Support-rX) indicating whether connection maintenance handover is possible.
  • the cmho-Support-rX may include information indicating to which band a connection maintenance handover can be performed in a specified combination of bands. For example, a part or all of the following (A) to (G) may be included.
  • C Information indicating whether or not connection maintenance handover is possible between a plurality of bands.
  • D Information indicating whether or not connection maintenance handover is possible within the same frequency within one band.
  • E Information indicating whether or not connection maintenance handover is possible between different frequencies within one band.
  • each target band may be indicated by a single bit for all the target bands, or each target band is supported.
  • Each bit string may indicate whether or not each bit is acceptable.
  • RF-Parameters-rX may include band combination information corresponding to the order of Band Combination Parameters-rX and one-to-one.
  • the band combination information at this time may include a part or all of the components of the Supported Band Combination-r10.
  • cmho-Support-rX may include individual parameters for uplink and downlink.
  • UECapabilityEnquiry notified from the base station apparatus 3 includes information on whether or not to notify the terminal apparatus capability information related to the connection maintenance type handover, and the terminal apparatus 2 based on the information makes the terminal related to the connection maintenance type handover. It may be determined whether to notify the device capability information.
  • the terminal device 2 can efficiently notify the base station device 3 of the terminal device capability regarding the connection maintenance handover.
  • the terminal device 2 applies the connection maintenance type handover in the combination of supported band combination-v1250, which is information / parameter indicating the band combination to which dual connectivity can be applied, and the band to which the dual connectivity can be applied.
  • the base station apparatus 3 is notified of one or more bit information indicating whether or not it can be performed.
  • the bit information may be included in a parameter (for example, RF-Parameters) included in a parameter UE-E-UTRA-Capability that notifies the terminal device capability.
  • a parameter for example, RF-Parameters
  • the terminal device 2 and the base station device 3 interpret that the following (A) to (C) are part or all of the following.
  • bit information is a plurality of bits
  • some or all of the following (D) to (G) may be indicated.
  • Band Combination Parameters-rX included in Supported Band Combination-rX and the order of the list of combinations of bands indicated by Supported Band Combination-r 10 may correspond one-to-one.
  • RF-Parameters-rX may include band combination information corresponding to the order of Band Combination Parameters-rX and one-to-one.
  • UECapabilityEnquiry notified from the base station apparatus 3 includes information on whether or not to notify the terminal apparatus capability information related to the connection maintenance type handover, and the terminal apparatus 2 based on the information makes the terminal related to the connection maintenance type handover. It may be determined whether to notify the device capability information.
  • the terminal device 2 can effectively notify the base station device 3 of the terminal device capability regarding the connection maintenance type handover by diverting the notification parameter of the terminal device capability regarding the dual connectivity. Can do. Further, the base station apparatus 3 can use the terminal apparatus capability related to dual connectivity based on the bit information notified from the terminal apparatus 2 to interpret the terminal apparatus capability related to the connection maintenance type handover. Acquisition is possible.
  • the terminal device 2 In the RRM measurement, the terminal device 2 notifies the base station device 3 whether or not connection maintenance handover is possible in the measurement report.
  • the terminal device 2 is assigned one or more frequencies to be measured as RRM measurement settings. Therefore, the terminal device 2 may add information indicating whether or not connection maintenance handover is possible for each frequency to be measured when reporting the RRM measurement. At this time, when determining whether or not connection-maintaining handover is possible, the frequency that can be used for connection-maintaining handover under the assumption that only PCell (or only MCG) connection is maintained may be indicated, or SCG is set. In the case of being present, the frequency that can be maintained by the connection maintenance type in the assumption of maintaining the connection between the PCell and the PSCell may be indicated.
  • the RRM measurement setting set from the base station apparatus 3 includes information on whether or not to notify information related to connection maintenance handover, and the terminal apparatus 2 measures information related to connection maintenance handover based on this information. You may judge whether to notify by report.
  • the terminal device 2 can efficiently determine whether or not the connection maintenance handover is possible in the current serving cell without notifying a large amount of the terminal device capability information of the connection maintenance handover.
  • the device 3 can be notified.
  • FIG. 2 is a schematic block diagram showing the configuration of the terminal device 2 of the present embodiment.
  • the terminal device 2 includes a wireless transmission / reception unit 20 and an upper layer processing unit 24.
  • the wireless transmission / reception unit 20 includes an antenna unit 21, an RF (Radio Frequency) unit 22, and a baseband unit 23.
  • the upper layer processing unit 24 includes a medium access control layer processing unit 25 and a radio resource control layer processing unit 26.
  • the wireless transmission / reception unit 20 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.
  • the upper layer processing unit 24 outputs the uplink data (transport block) generated by the user operation or the like to the wireless transmission / reception unit 20.
  • the upper layer processing unit 24 includes a medium access control (MAC: Medium Access Control) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control (Radio). Process the Resource Control (RRC) layer.
  • MAC Medium Access Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • Radio Radio
  • the medium access control layer processing unit 25 included in the upper layer processing unit 24 performs processing of the medium access control layer.
  • the medium access control layer processing unit 25 controls transmission of the scheduling request based on various setting information / parameters managed by the radio resource control layer processing unit 26.
  • the radio resource control layer processing unit 26 included in the upper layer processing unit 24 performs processing of the radio resource control layer.
  • the radio resource control layer processing unit 26 manages various setting information / parameters of the own device.
  • the radio resource control layer processing unit 26 sets various setting information / parameters based on the upper layer signal received from the base station apparatus 3. That is, the radio resource control layer processing unit 26 sets various setting information / parameters based on information indicating various setting information / parameters received from the base station apparatus 3.
  • the wireless transmission / reception unit 20 performs physical layer processing such as modulation, demodulation, encoding, and decoding.
  • the radio transmission / reception unit 20 separates, demodulates, and decodes the signal received from the base station apparatus 3 and outputs the decoded information to the upper layer processing unit 24.
  • the radio transmission / reception unit 20 generates a transmission signal by modulating and encoding data, and transmits the transmission signal to the base station apparatus 3.
  • the RF unit 22 converts the signal received via the antenna unit 21 into a baseband signal by orthogonal demodulation (down-conversion: down cover), and removes unnecessary frequency components.
  • the RF unit 22 outputs the processed analog signal to the baseband unit.
  • the baseband unit 23 converts the analog signal input from the RF unit 22 into a digital signal.
  • the baseband unit 23 removes a portion corresponding to CP (CyclicPrefix) from the converted digital signal, performs fast Fourier transform (FFT) on the signal from which CP is removed, and extracts a frequency domain signal. To do.
  • CP CyclicPrefix
  • FFT fast Fourier transform
  • the baseband unit 23 performs an inverse fast Fourier transform (IFFT) on the data to generate an SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol, and converts the baseband digital signal to Generate and convert baseband digital signals to analog signals.
  • IFFT inverse fast Fourier transform
  • the RF unit 22 removes an extra frequency component from the analog signal input from the baseband unit 23 using a low-pass filter, up-converts the analog signal to a carrier frequency, and transmits it through the antenna unit 21. To do.
  • the RF unit 22 amplifies power. Further, the RF unit 22 may have a function of controlling transmission power.
  • the RF unit 22 is also referred to as a transmission power control unit.
  • the terminal device 2 is configured to include a part or all of each part in order to support transmission / reception processing in the same subframe of a plurality of frequencies (frequency bands, frequency bandwidths) or cells by carrier aggregation. Also good.
  • FIG. 3 is a schematic block diagram showing the configuration of the base station apparatus 3 of the present embodiment.
  • the base station apparatus 3 includes a radio transmission / reception unit 30 and an upper layer processing unit 34.
  • the wireless transmission / reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33.
  • the upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36.
  • the wireless transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.
  • the upper layer processing unit 34 includes a medium access control (MAC: Medium Access Control) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control (Radio). Process the Resource Control (RRC) layer.
  • MAC Medium Access Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • Radio Radio Resource Control
  • RRC Radio Resource Control
  • the medium access control layer processing unit 35 included in the upper layer processing unit 34 performs processing of the medium access control layer.
  • the medium access control layer processing unit 35 performs processing related to the scheduling request based on various setting information / parameters managed by the radio resource control layer processing unit 36.
  • the radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the radio resource control layer.
  • the radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC message, MAC CE (Control Element), etc. arranged in the physical downlink shared channel, or obtains it from the upper node. , Output to the wireless transceiver 30.
  • the radio resource control layer processing unit 36 manages various setting information / parameters of each terminal device 2.
  • the radio resource control layer processing unit 36 may set various setting information / parameters for each of the terminal devices 2 via upper layer signals. That is, the radio resource control layer processing unit 36 transmits / notifies information indicating various setting information / parameters.
  • the upper layer processing unit 34 transmits (transfers) a control message or user data between the base station apparatuses 3 or between the upper network apparatus (MME, S-GW (Serving-GW)) and the base station apparatus 3. ) Or receive.
  • MME upper network apparatus
  • S-GW Serving-GW
  • FIG. 3 other constituent elements of the base station apparatus 3 and transmission paths for data (control information) between the constituent elements are omitted, but other functions necessary for operating as the base station apparatus 3 are omitted. It is clear that it has a plurality of blocks as constituent elements.
  • a radio resource management layer processing unit and an application layer processing unit exist above the radio resource control layer processing unit 36.
  • part in the figure is an element that realizes the functions and procedures of the terminal device 2 and the base station device 3, which are also expressed by terms such as section, circuit, component device, device, and unit.
  • Each of the parts denoted by reference numerals 10 to 16 included in the terminal device 2 may be configured as a circuit.
  • Each of the parts denoted by reference numerals 30 to 36 included in the base station device 3 may be configured as a circuit.
  • a first aspect of the present invention is a terminal apparatus that communicates with a base station apparatus via a cell, and in the first cell, a handover command that instructs handover to the second cell is transmitted to the base station apparatus.
  • RRC radio resource control
  • the first timer expires If the second timer is not timed or expired, it is not considered as a radio link failure and does not reestablish radio resource control (RRC), and the first timer starts timing when a handover command is received.
  • the second timer starts counting when a predetermined number of consecutive out-of-synchronization states are detected in the first cell, and continues the synchronization state in the first cell.
  • a timer that stops the counter when predetermined count detection.
  • the second timer further receives a handover command when the handover is a handover that does not continue communication with the first cell after receiving the handover command. Then, the clocking is stopped, and when the handover is a handover in which communication with the first cell is continued even after the handover command is received, the clocking is continued.
  • the second timer may be configured to receive a handover command when the handover is a handover that continues communication with the first cell even after the handover command is received. Measure time.
  • a second aspect of the present invention is a base station device that communicates with a terminal device, and transmits a handover command instructing handover from the first cell to the second cell to the terminal device. Including a value to be set in the first timer, the timer is set in the first cell when the handover is a handover in which communication with the first cell is continued even after the handover command is received. Used to determine the radio link failure.
  • a third aspect of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device via a cell, and instructs a handover to the second cell in the first cell.
  • RRC radio resource control
  • the first timer is a timer that starts timing when a handover command is received, and the second timer continues the out-of-sync state in the first cell. It starts timing upon predetermined frequency detecting a timer to stop the counting when the predetermined number of times detects a synchronization state in the first cell in succession.
  • a fourth aspect of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device via a cell, and instructs a handover to the second cell in the first cell.
  • a step of receiving a handover command from the base station apparatus and when the first timer expires, radio resource control (RRC) re-establishment is considered as a radio link failure if the second timer is timing or has expired.
  • RRC radio resource control
  • the radio link control is not regarded as a radio link failure and no radio resource control (RRC) re-establishment is performed.
  • the timer is a timer that starts timing when a handover command is received, and the second timer continuously counts out-of-sync conditions in the first cell. It starts timing upon detecting a timer to stop the counting when the predetermined number of times detected state of synchronization in the first cell in succession.
  • the terminal device 2 can efficiently notify the base station device 3 of the terminal device capability related to the connection maintenance handover.
  • the uplink transmission scheme can be applied to both communication systems of the FDD (frequency division duplex) scheme and the TDD (time division duplex) scheme.
  • the names of the parameters and events shown in the embodiments are referred to for convenience of explanation, and even if the names actually applied differ from the names of the embodiments of the present invention, It does not affect the gist of the invention claimed in the embodiments of the invention.
  • connection used in each embodiment is not limited to a configuration in which a certain device and another certain device are directly connected using a physical line, and is logically connected. And a configuration for wireless connection using a wireless technology.
  • the terminal device 2 is also called a user terminal, a mobile station device, a communication terminal, a mobile device, a terminal, a UE (User Equipment), and an MS (Mobile Station).
  • the base station apparatus 3 is also referred to as a radio base station apparatus, a base station, a radio base station, a fixed station, an NB (Node B), an eNB (evolved Node B), a BTS (Base Transceiver Station), and a BS (Base Station).
  • the base station device 3 according to the present invention can also be realized as an aggregate (device group) composed of a plurality of devices.
  • Each of the devices constituting the device group may include a part or all of each function or each functional block of the base station device 3 according to the above-described embodiment.
  • the device group only needs to have one function or each function block of the base station device 3.
  • the terminal device 2 according to the above-described embodiment can also communicate with the base station device 3 as an aggregate.
  • the base station device 3 in the above-described embodiment may be EUTRAN (Evolved Universal Terrestrial Radio Access Network).
  • the base station device 3 in the above-described embodiment may have a part or all of the functions of the upper node for the eNodeB.
  • the program that operates in the apparatus related to the present invention may be a program that controls the central processing unit (CPU) and the like to function the computer so as to realize the functions of the above-described embodiments related to the present invention.
  • the program or the information handled by the program is temporarily read into volatile memory such as Random Access Memory (RAM) during processing, or stored in nonvolatile memory such as flash memory or Hard Disk Drive (HDD).
  • RAM Random Access Memory
  • HDD Hard Disk Drive
  • the CPU reads and corrects / writes.
  • the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.
  • the “computer system” here is a computer system built in the apparatus, and includes hardware such as an operating system and peripheral devices.
  • the “computer-readable recording medium” may be any of a semiconductor recording medium, an optical recording medium, a magnetic recording medium, and the like.
  • Computer-readable recording medium means a program that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line.
  • a volatile memory inside a computer system that serves as a server or a client may also include a program that holds a program for a certain time.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • each functional block or various features of the apparatus used in the above-described embodiments can be implemented or executed by an electric circuit, that is, typically an integrated circuit or a plurality of integrated circuits.
  • Electrical circuits designed to perform the functions described herein can be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or others Programmable logic devices, discrete gate or transistor logic, discrete hardware components, or a combination thereof.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • the general-purpose processor or each circuit described above may be configured by a digital circuit or an analog circuit.
  • an integrated circuit based on the technology can be used.
  • the present invention is not limited to the above-described embodiment.
  • an example of an apparatus has been described.
  • the present invention is not limited to this, and a stationary or non-movable electronic device installed indoors or outdoors, such as an AV device, a kitchen device, It can be applied to terminal devices or communication devices such as cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other daily life equipment.
  • Terminal device 3 (3A, 3B) Base station device 20, 30 Radio transmission / reception unit 21, 31 Antenna unit 22, 32 RF unit 23, 33 Baseband unit 24, 34 Upper layer processing unit 25, 35 Medium access control layer processing unit 26, 36 Radio resource control layer processing unit

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

Abstract

L'invention concerne une technologie relative à un dispositif terminal, un dispositif station de base, un procédé de communication, et un circuit intégré, aptes à maintenir efficacement une communication. Une instruction de transfert ordonnant un transfert à une seconde cellule est reçue du dispositif de station de base dans une première cellule. Lorsqu'un premier temporisateur a expiré et qu'un second temporisateur est actif ou a expiré, la défaillance d'une liaison radio est déterminée, et une gestion des ressources radio (RRC) est rétablie. Lorsque le premier temporisateur a expiré et que le second temporisateur est inactif ou n'a pas expiré, la défaillance d'une liaison radio n'est pas déterminée, et une une gestion des ressources radio (RRC) n'est pas rétablie. Le premier temporisateur initie une temporisation lorsqu'une instruction de transfert a été reçue. Le second temporisateur initie une temporisation lorsqu'un état de perte de synchronisation a été détecté successivement pour la première cellule un nombre de fois prédéterminé, et interrompt la temporisation lorsqu'un état synchronisé a été détecté successivement pour la première cellule un nombre de fois prédéterminé.
PCT/JP2017/005529 2016-03-23 2017-02-15 Dispositif terminal, dispositif station de base, procédé de communication, et circuit intégré Ceased WO2017163676A1 (fr)

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CN111886891B (zh) * 2018-01-11 2024-02-06 株式会社Ntt都科摩 用户终端以及无线通信方法
CN111989950A (zh) * 2018-04-10 2020-11-24 高通股份有限公司 用于低时延切换的载波聚合
US11889362B2 (en) 2018-04-10 2024-01-30 Qualcomm Incorporated Carrier aggregation for low-latency handover
WO2019199584A1 (fr) * 2018-04-10 2019-10-17 Qualcomm Incorporated Agrégation de porteuses pour un transfert à faible latence
CN111989950B (zh) * 2018-04-10 2023-10-20 高通股份有限公司 用于低时延切换的载波聚合
CN112997519B (zh) * 2018-12-18 2024-03-15 联想(北京)有限公司 用于非地面网络中的通信的用户装备、基站及方法
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WO2020139015A1 (fr) * 2018-12-28 2020-07-02 Lg Electronics Inc. Procédé et appareil de gestion de mobilité dans un système de communication sans fil
US12225418B2 (en) 2018-12-28 2025-02-11 Lg Electronics Inc. Method and apparatus for mobility management in wireless communication system
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