WO2023276832A1 - Dispositif utilisateur, dispositif de station de base et procédé de contrôle de communication - Google Patents

Dispositif utilisateur, dispositif de station de base et procédé de contrôle de communication Download PDF

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Publication number
WO2023276832A1
WO2023276832A1 PCT/JP2022/024933 JP2022024933W WO2023276832A1 WO 2023276832 A1 WO2023276832 A1 WO 2023276832A1 JP 2022024933 W JP2022024933 W JP 2022024933W WO 2023276832 A1 WO2023276832 A1 WO 2023276832A1
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Prior art keywords
cell
network
rrc
base station
control unit
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PCT/JP2022/024933
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English (en)
Japanese (ja)
Inventor
智之 山本
秀明 ▲高▼橋
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株式会社デンソー
トヨタ自動車株式会社
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Publication of WO2023276832A1 publication Critical patent/WO2023276832A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present disclosure relates to user equipment, base stations, and communication control methods used in mobile communication systems.
  • a mobile communication system standardization project a user device equipped with multiple subscriber identification modules is located in the networks of multiple carriers.
  • a work item has been launched to formulate a function to perform data communication while At present, there is no provision in the standard specifications for a mechanism for receiving paging by user devices that are present in multiple networks, and it depends on the implementation of the user device. Therefore, a method of receiving paging from a plurality of networks in cooperation with each network is being studied in the 3GPP standardization arena.
  • the first network If communication with the second network is prioritized over communication with the user equipment, the user equipment temporarily transitions from the RRC connected state in the first network in order to switch communication from the first network to the second network (i.e. , and leave) to the first network (for example, see Non-Patent Document 1). Unnecessary communication with the first network can be suppressed during communication with the second network by removing the user equipment from the RRC connected state in the first network.
  • Non-Patent Document 2 In addition to the case of transitioning from the RRC connected state in the first network to the RRC idle state, a case of transitioning to the RRC inactive state in which the context information of the user equipment is held in the first network is also being considered. (For example, see Non-Patent Document 2).
  • the user equipment transmits to the first network a switching notification indicating that the first network expects a transition from the RRC connected state to the RRC inactive state, suspend setting information indicating settings for the RRC inactive state from the base station of the first network.
  • the user device can transition to the RRC inactive state in the first network using the suspend setting information and communicate with the second network while maintaining the RRC inactive state.
  • the user equipment can simplify the procedure for starting communication with the first network after finishing communication with the second network.
  • a user device is a user device that communicates with a first network using a first subscriber identity module and communicates with a second network using a second subscriber identity module, wherein the first Before transmitting a switching notification for switching communication from the RRC connected state to the second network in the network, between the user equipment and the first cell of the first network, to the RRC inactive state and receiving from said first cell an RRC reconfiguration message used to perform a handover from said first cell to a second cell of said first network. and a communication unit, wherein the control unit performs the pre-configuration procedure between the user equipment and the second cell after handover to the second cell based on the RRC reconfiguration message. Determine whether or not to omit.
  • a base station is a mobile communication system having user equipment that communicates with a first network using a first subscriber identity module and communicates with a second network using a second subscriber identity module.
  • a base station of a second network a network communication unit that receives from an adjacent base station a handover request message requesting preparation of resources for handover of the user equipment, and suspend indicating setting of transition to RRC inactive state a control unit for including setting information in a response message to the handover request message as information to be transmitted to the user equipment.
  • a communication control method is a communication control method executed by a user device that communicates with a first network using a first subscriber identification module and communicates with a second network using a second subscriber identification module. and before transmitting a switch notification for switching communication from the RRC connected state to the second network in the first network, between the user equipment and the first cell of the first network and performing a pre-configuration procedure for configuring a transition to an RRC inactive state; and transmitting an RRC reconfiguration message used to perform a handover from the first cell to a second cell of the first network. receiving from a first cell and skipping the pre-configuration procedure between the user equipment and the second cell after handover to the second cell based on the RRC reconfiguration message; and determining whether or not.
  • FIG. 1 is a diagram showing a configuration example of a mobile communication system according to an embodiment.
  • FIG. 2 is a diagram showing a configuration example of a protocol stack of the mobile communication system according to the embodiment.
  • FIG. 3 is a diagram illustrating a configuration example of a UE (user equipment) according to the embodiment.
  • FIG. 4 is a diagram showing a configuration example of a base station of the first network according to the embodiment.
  • FIG. 5 is a diagram (part 1) illustrating a first operation example of the embodiment;
  • FIG. 6 is a diagram (part 2) illustrating a first operation example of the embodiment;
  • FIG. 7 is a diagram showing a second operation example of the embodiment.
  • FIG. 8 is a diagram showing a third operation example of the embodiment.
  • FIG. 9 is a diagram illustrating an example of determination operation of the UE 100 of the embodiment.
  • the user equipment when the user equipment prioritizes communication with the second network over communication with the first network, the user equipment and the It is conceivable to perform a procedure (hereinafter referred to as a pre-configuration procedure) for configuring the transition to the RRC inactive state with the first network.
  • a pre-configuration procedure for configuring the transition to the RRC inactive state with the first network.
  • a user equipment that has performed a pre-configuration procedure before handover can autonomously transition to the RRC inactive state even after handover by performing the pre-configuration procedure after handover.
  • the user equipment has to perform a pre-configuration procedure each time it performs a handover, which increases the signaling between the user equipment and the base station.
  • the present disclosure provides user equipment, base One object is to provide a station and a communication control method.
  • FIG. 1 A configuration of a mobile communication system 1 according to an embodiment will be described with reference to FIG.
  • 5G/NR 3GPP standard fifth generation system
  • 4G/LTE Long Term Evolution
  • the mobile communication system 1 has a user equipment (UE: User Equipment) 100, a first network 200A, and a second network 200B.
  • UE User Equipment
  • the UE 100 is an example of a communication device.
  • UE 100 is a mobile wireless communication device.
  • UE 100 may be a device used by a 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 chipset), a sensor or a device provided in a sensor, a vehicle or a device provided in a vehicle (for example, Vehicle UE), an aircraft or a device installed on the aircraft (for example, Aerial UE).
  • the UE 100 is a multi-SIM device that supports multiple subscriber identity modules (SIM).
  • SIM subscriber identity modules
  • the UE 100 communicates with multiple networks using multiple SIMs.
  • An example in which the UE 100 supports two SIMs will be mainly described below, but the UE 100 may support three or more SIMs.
  • “Supporting multiple SIMs” means that the UE 100 has the ability to handle multiple SIMs, and the UE 100 does not necessarily have to be equipped with multiple SIMs.
  • Such a UE 100 is sometimes called a "UE that supports multiple SIMs”.
  • the SIM is not limited to a card-type SIM (so-called SIM card), and may be an embedded SIM (so-called eSIM) pre-installed in the UE 100 .
  • the SIM is sometimes called a USIM (Universal Subscriber Identity Module).
  • the first network 200A is a network associated with one SIM of the UE 100.
  • a second network 200B is a network associated with the other SIM of the UE 100 . It is assumed that UE 100 performs location registration with first network 200A using one SIM, and performs location registration with second network 200B using the other SIM. That is, UE 100 is located in each of first network 200A and second network 200B.
  • the first network 200A and the second network 200B may be networks of different carriers. However, the first network 200A and the second network 200B may be networks of the same carrier. Different PLMN (Public Land Mobile Network) IDs may be assigned to the first network 200A and the second network 200B.
  • PLMN Public Land Mobile Network
  • the first network 200A has a base station 210A and a core network 220A that constitute a radio access network.
  • the core network 220A has a mobility management device 221A and a gateway device 222A as core network devices.
  • the second network 200B has a base station 210B and a core network 220B forming a radio access network.
  • the core network 220B has a mobility management device 221B and a gateway device 222B as core network devices.
  • the base stations 210A and 200B are not distinguished, they are simply referred to as the base station 210; when the mobility management devices 221A and 221B are not distinguished, they are simply referred to as the mobility management device 221; It is called gateway device 222 .
  • the base station 210 is a wireless communication device that performs wireless communication with the UE 100.
  • a base station 210 manages one or more cells.
  • the base station 210 performs radio communication with the UE 100 that has established a connection in the radio resource control (RRC) layer with its own cell.
  • the base station 210 has a radio resource management (RRM) function, a user data (hereinafter simply referred to as “data”) routing function, a measurement control function for mobility control/scheduling, and the like.
  • RRM radio resource management
  • a "cell” is used as a term indicating the minimum unit of a wireless communication area.
  • a “cell” is also used as a term indicating a function or resource for radio communication with the UE 100 .
  • One cell belongs to one carrier frequency.
  • FIG. 1 shows an example in which the base station 210A manages the cell C1 and the base station 210B manages the cell C2.
  • the UE 100 is located in the overlapping area of cell C1 and cell
  • the base station 210 may be a gNB, which is a 5G/NR base station, or an eNB, which is a 4G/LTE base station. In the following, an example in which the base station 210 is a gNB will be mainly described.
  • the base station 210 may be functionally divided into a CU (Central Unit) and a DU (Distributed Unit).
  • the base station 210 may be a relay node such as an IAB (Integrated Access and Backhaul) node.
  • the mobility management device 221 is a device that supports the control plane and performs various types of mobility management for the UE 100 .
  • the mobility management device 221 communicates with the UE 100 using NAS (Non-Access Stratum) signaling and manages information on the tracking area in which the UE 100 is located.
  • the mobility management device 221 performs paging through the base station 210 to notify the UE 100 of the incoming call.
  • the mobility management device 221 may be a 5G/NR AMF (Access and Mobility Management Function) or a 4G/LTE MME (Mobility Management Entity).
  • the gateway device 222 is a device compatible with the user plane, and is a device that performs data transfer control for the UE 100 .
  • the gateway device 222 may be a 5G/NR UPF (User Plane Function) or a 4G/LTE S-GW (Serving Gateway).
  • the protocol of the radio section between the UE 100 and the base station 210 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 and RRC (Radio Resource Control) layer.
  • PHY physical
  • MAC Medium Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • the PHY layer performs encoding/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 base station 210 via physical channels.
  • the MAC layer performs data priority control, hybrid ARQ (HARQ) retransmission processing, random access procedures, and so on. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the base station 210 via transport channels.
  • the MAC layer of base station 210 includes a scheduler. The scheduler determines uplink and downlink transport formats (transport block size, modulation and coding scheme (MCS)) and allocation resources to the UE 100 .
  • MCS modulation and coding scheme
  • the RLC layer uses the functions of the MAC layer and PHY layer to transmit data to the RLC layer on the receiving side. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the base station 210 via logical channels.
  • the PDCP layer performs header compression/decompression and encryption/decryption.
  • An SDAP (Service Data Adaptation Protocol) layer may be provided as an upper layer of the PDCP layer.
  • the SDAP (Service Data Adaptation Protocol) layer performs mapping between an IP flow, which is the unit of QoS (Quality of Service) control performed by the core network, and a radio bearer, which is the unit of AS (Access Stratum) QoS control.
  • the RRC layer controls logical channels, transport channels and physical channels according to radio bearer establishment, re-establishment and release.
  • RRC signaling for various settings is transmitted between the RRC layer of the UE 100 and the RRC layer of the base station 210 . If there is an RRC connection between the RRC of UE 100 and the RRC of base station 210, UE 100 is in the RRC connected state. If there is no RRC connection between the RRC of the UE 100 and the RRC of the base station 210, the UE 100 is in RRC idle state. When the RRC connection between the RRC of UE 100 and the RRC of base station 210 is suspended, UE 100 is in RRC inactive state.
  • the NAS layer located above the RRC layer performs session management and mobility management for UE100.
  • NAS signaling is transmitted between the NAS layer of UE 100 and the NAS layer of mobility management device 221 .
  • NAS states in the NAS layer of UE 100 include idle mode and connected mode.
  • the network holds the context information of the UE 100, and in the idle mode, the network does not hold the context information of the UE 100.
  • UE 100 is in connected mode, UE 100 is in RRC connected state or RRC inactive state.
  • the UE 100 is in RRC idle state.
  • the mode in the NAS layer may be 5GMM (5G Mobility Management) mode.
  • the connected mode may be 5GMM-connected mode and the idle mode may be 5GMM-idle mode.
  • the UE 100 has an application layer and the like in addition to the radio interface protocol.
  • UE 100 has antenna 101, SIM 111, SIM 112, communication section 120, and control section .
  • the antenna 101 may be provided outside the UE 100 .
  • SIM 111 and SIM 112 are SIM cards or eSIMs.
  • the SIM 111 stores subscriber information and setting information necessary for the UE 100 to communicate with the first network 200A.
  • the SIM 111 stores identification information of the UE 100 in the first network 200A, such as a telephone number and IMSI (International Mobile Subscriber Identity).
  • SIM 111 corresponds to the first subscriber information module.
  • UE 100 uses SIM 111 to communicate with first network 200A.
  • the SIM 112 stores subscriber information and setting information necessary for the UE 100 to communicate with the second network 200B.
  • the SIM 112 stores identification information of the UE 100 in the second network 200B, such as telephone number and IMSI.
  • SIM 112 corresponds to the second subscriber information module.
  • UE 100 uses SIM 112 to communicate with second network 200B.
  • the communication unit 120 Under the control of the control unit 130, the communication unit 120 performs wireless communication with the first network 200A and wireless communication with the second network 200B via the antenna 101.
  • the communication unit 120 may have only one receiver (RX: Receiver) 121 . In this case, the communication unit 120 cannot receive from the first network 200A and receive from the second network 200B at the same time.
  • the communication section 120 may have a plurality of reception sections 121 .
  • the communication unit 120 may have only one transmission unit (TX: Transmitter) 122 . In this case, the communication unit 120 cannot perform transmission to the first network 200A and transmission to the second network 200B at the same time.
  • the communication section 120 may have a plurality of transmission sections 122 .
  • Receiving section 121 converts a radio signal received by antenna 101 into a received signal that is a baseband signal, performs signal processing on the received signal, and outputs the received signal to control section 130 .
  • Transmitter 122 performs signal processing on a transmission signal, which is a baseband signal output from controller 130 , converts the signal into a radio signal, and transmits the radio signal from antenna 101 .
  • the control unit 130 controls the communication unit 120 and performs various controls in the UE 100.
  • Control unit 130 uses SIM 111 to control communication with first network 200A and uses SIM 112 to control communication with second network 200B.
  • Control unit 130 includes at least one processor and at least one memory.
  • the memory stores programs executed by the processor and information used for processing by the processor.
  • the memory may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), RAM (Random Access Memory) and flash memory.
  • the processor may include a digital signal processor (DSP), which performs digital processing of digital signals, and a central processing unit (CPU), which executes programs. Note that part of the memory may be provided in the communication unit 120 . Also, the DSP may be provided in the communication unit 120 .
  • the control unit 130 includes an RRC processing unit 131 and a NAS processing unit 132 .
  • the RRC processing unit 131 performs processing in the RRC layer processing.
  • the NAS processing unit 132 performs processing in the NAS layer, which is a higher layer than the RRC layer. Note that the RRC processing unit 131 and the NAS processing unit 132 may be configured by one processor, or may be configured by a plurality of processors.
  • the UE 100 configured in this manner uses SIM 111 to communicate with the first network 200A and uses SIM 112 to communicate with the second network 200B.
  • Control unit 130 transfers from the RRC connected state in first network 200A and before transmitting a switching notification for switching communication to second network 200B, between UE 100 and the first cell of first network 200A. , perform the pre-configuration procedure for setting the transition to the RRC inactive state.
  • the communication unit 120 receives from the first cell an RRC reconfiguration message that is used to perform handover from the first cell to the second cell of the first network 200A. Based on the RRC reconfiguration message, control section 130 determines whether or not to omit the pre-configuration procedure between UE 100 and the second cell after handover to the second cell.
  • the UE 100 to omit the pre-configuration procedure after handover, depending on the determination result.
  • the preset procedure is not always executed every time the handover procedure is executed, so that an increase in signaling caused by the handover of the UE 100 can be suppressed.
  • the control unit 130 determines to omit the preconfiguration procedure after the handover to the second cell. you can By this means, the UE 100 can omit the pre-configuration procedure after handover, and can suppress an increase in signaling caused by the handover of the UE 100.
  • the communication unit 120 may receive suspend setting information indicating settings for transition to the RRC inactive state from the first cell in the pre-setting procedure. If the RRC reconfiguration message includes full configuration information for releasing the configuration information configured in the UE 100 from the first cell, the control unit 130 may discard the suspend configuration information received in the preconfiguration procedure. By this means, the UE 100 can avoid unnecessarily keeping the suspend setting information received in the pre-setting procedure.
  • the control unit 130 determines to omit the preconfiguration procedure after handover to the second cell.
  • the UE 100 can omit the pre-configuration procedure after handover, and can suppress an increase in signaling caused by the handover of the UE 100.
  • the communication unit 120 may receive suspend setting information indicating settings for transition to the RRC inactive state from the first cell in the pre-setting procedure. If the suspend configuration information included in the RRC reconfiguration message does not include parameter values to be applied to the UE 100, the control unit 130 may maintain the parameter values included in the suspend configuration information received in the pre-configuration procedure. By this means, when maintaining the suspend setting information received in the pre-setting procedure, the amount of information in the suspend setting information can be reduced, and communication resources between the UE 100 and the base station 210 can be reduced. In addition, the load due to updating processing of setting information in the UE 100 can be reduced, and the power consumption of the UE 100 can be suppressed.
  • the communication unit 120 may receive suspend setting information indicating settings for transition to the RRC inactive state from the first cell in the pre-setting procedure. If the suspend setting information included in the RRC reconfiguration message includes a parameter value to be applied to UE 100, control unit 130 sets the parameter value included in the suspend setting information received in the pre-configuration procedure based on the parameter value. may be updated. As a result, the UE 100 uses the suspend setting information received in the pre-setting procedure, so that the pre-setting procedure can be omitted after the handover, and an increase in signaling caused by the handover of the UE 100 can be suppressed.
  • the communication unit 120 may receive suspend setting information indicating settings for transition to the RRC inactive state from the first cell in the pre-setting procedure. If the RRC reconfiguration message does not include the suspend configuration information generated by the base station 210 managing the second cell, the controller 130 may discard the suspend configuration information received in the pre-configuration procedure. By this means, the UE 100 can avoid unnecessarily keeping the suspend setting information received in the pre-setting procedure.
  • the communication unit 120 may receive system information blocks broadcast from the second cell. Based on the system information block, the controller 130 may determine whether to perform a pre-configuration procedure after handover to the second cell. This allows the UE 100 to determine whether to perform the pre-configuration procedure without receiving individual signaling from the second cell after handover. As a result, it is possible to suppress an increase in separate signaling for determining whether or not to perform the pre-configuration procedure.
  • the controller 130 may determine to perform the pre-configuration procedure after handover to the second cell if the system information block includes support information indicating that the second cell supports performing the pre-configuration procedure. . Thereby, the UE 100 can execute the pre-configuration procedure when the second cell supports the execution of the pre-configuration procedure.
  • the control unit 130 determines to omit the pre-configuration procedure after handover to the second cell if the system information block does not include support information indicating that the second cell supports the execution of the pre-configuration procedure. good. Thereby, the UE 100 can avoid executing the pre-configuration procedure when the second cell does not support execution of the pre-configuration procedure, and can suppress an increase in signaling due to the handover of the UE 100. .
  • the operation of the functional units provided in the UE 100 may be described as the operation of the UE 100.
  • Base station configuration example A configuration example of the base station 210A of the first network 200A will be described with reference to FIG. Note that the base station 210B of the second network 200B has the same configuration as the base station 210A, so description thereof will be omitted. As shown in FIG. 4, the base station 210A has an antenna 211, a radio communication section 212, a network communication section 213, and a control section 214.
  • the wireless communication unit 212 communicates with the UE 100 via the antenna 211.
  • the wireless communication unit 212 has a receiving unit 212a and a transmitting unit 212b.
  • the receiving unit 212 a converts a radio signal received by the antenna 211 into a received signal that is a baseband signal, performs signal processing on the received signal, and outputs the received signal to the control unit 214 .
  • the transmission unit 212 b performs signal processing on a transmission signal, which is a baseband signal output from the control unit 214 , converts the signal into a radio signal, and transmits the radio signal from the antenna 211 .
  • the network communication unit 213 is connected to the core network 220A.
  • Network communication unit 213 performs network communication with mobility management device 221A and gateway device 222A under the control of control unit 214 .
  • the control unit 214 controls the wireless communication unit 212 and performs various controls in the base station 210A.
  • Control unit 214 includes at least one processor and at least one memory.
  • the memory stores programs executed by the processor and information used for processing by the processor.
  • the memory may include at least one of ROM, EPROM, EEPROM, RAM and flash memory.
  • the processor may include a digital signal processor (DSP), which performs digital processing of digital signals, and a central processing unit (CPU), which executes programs. Note that part of the memory may be provided in the wireless communication unit 212 . Also, the DSP may be provided in the wireless communication unit 212 .
  • DSP digital signal processor
  • the network communication unit 213 receives a handover request message requesting preparation of resources for handover of the UE 100 from the adjacent base station.
  • the control unit 214 includes, as information to be transmitted to the UE 100, suspension setting information indicating setting of transition to the RRC inactive state in a response message to the handover request message. Accordingly, by transmitting the suspend setting information to the UE 100, the UE 100 can omit the pre-setting procedure after the handover, and can suppress an increase in signaling due to the handover of the UE 100.
  • the operation of the functional unit (specifically, at least one of the antenna 211, the wireless communication unit 212, the network communication unit 213, and the control unit 214) provided in the base station 210A is regarded as the operation of the base station 210A. I have something to explain.
  • the first network 200A has a base station 210A1 and a base station 210A2.
  • the base station 210A1 and the base station 210A2 are in a relationship of adjacent base stations.
  • Base station 210A1 manages cell C11
  • base station 210A2 manages cell C12.
  • UE 100 is located in cell C11 managed by base station 210A1 of first network 200A.
  • UE100 is in an RRC connected state in first network 200A, and an RRC connection is established between base station 210A1 and UE100.
  • Cell C11 is a serving cell for UE100.
  • communication between UE100 and base station 210A1 may be communication between UE100 and cell C11 in which UE100 is located. Communication between the UE 100 and the base station 210B (cell C12) is the same.
  • Step S101 The UE 100 and the base station 210A1 perform a pre-configuration procedure for setting the transition to the RRC inactive state between the UE 100 and the base station 210A1. Specifically, the communication unit 120 of the UE 100 transmits a Pre-configuration Request message to the base station 210A1. The radio communication unit 212 of the base station 210A1 receives the preset request message from the UE100. The pre-configuration procedure is performed before the UE 100 transmits the switching notification, that is, before the base station 210A1 receives the switching notification from the UE 100. In this operation example, the operations in steps S101 and S102 are executed in the preset procedure.
  • the preset request message may be a message for requesting suspend setting information by an RRC reconfiguration message. Details of the suspend setting information will be described later.
  • the preset request message is expectation information (RRC_INACTIVE expectation) indicating that transition from the RRC connected state to the RRC inactive state is expected in the first network 200A when switching communication from the first network 200A to the second network 200B.
  • RRC_INACTIVE expectation expectation information
  • the UE 100 may transmit a preset request message when receiving a service that is expected to be continuously exchanged in the first network 200A.
  • the UE 100 may use an existing message (eg, UE Assistance Information message) as the preset request message.
  • Step S102 The radio communication unit 212 of the base station 210A1 transmits the RRC reconfiguration message to the UE100.
  • the communication unit 120 of the UE 100 receives the RRC reconfiguration message from the base station 210A1.
  • the RRC reconfiguration message is a message for modifying the RRC connection between the first network 200A and the UE 100.
  • wireless communication unit 212 can transmit an RRC reconfiguration message in response to the pre-configuration request message.
  • the RRC reconfiguration message includes suspend configuration information (suspendConfig). Therefore, the radio communication unit 212 transmits the suspend setting information to the UE 100 using the RRC reset message.
  • Suspend setting information indicates settings for the RRC inactive state.
  • the suspend setting information includes, for example, RNA information (ran-NotificationAreaInfo).
  • the RNA information may include a list of cells set as RAN (radio access network) areas (cellList) and a list of RAN area codes or RA codes as RAN areas (ran-AreaConfigList).
  • the control unit 130 of the UE 100 can determine whether the UE 100 exists within the RAN area based on the RNA information. In addition, when the UE 100 exists outside the RNA area, an RNA update procedure for updating the RAN area is performed.
  • the base station 210A1 may not send an RRC reconfiguration message including suspend configuration information, eg, if it does not support the pre-configuration procedure.
  • the control unit 130 of the UE 100 holds suspend setting information. Even if the UE 100 receives the suspend setting information, the UE 100 does not immediately transition to the RRC inactive state, so it is not necessary to immediately apply the suspend setting information.
  • the UE 100 measures the radio quality (eg, reception strength, reception quality, etc.) of cell C11, which is the serving cell, and neighboring cells.
  • UE100 performs the process of step S103, when the conditions which report a measurement result are satisfy
  • Step S103 The communication unit 120 of the UE 100 transmits a measurement report including measurement results to the base station 210A1.
  • the radio communication unit 212 of the base station 210A1 receives the measurement report from the UE100.
  • the control unit 214 of the base station 210 determines whether or not to handover the UE 100 from the cell C11 to another cell based on the measurement report. For example, when the measurement result included in the measurement report indicates that the radio quality of cell C11 is worse than the threshold and the radio quality of cell C12 is better than the threshold, the control unit 214 transfers the UE 100 from cell C11 to cell C12. determine to execute handover to
  • control unit 214 determines that the UE 100 is to be handed over to a cell managed by another base station 210, it executes the process of step S104. In this operation example, the description will proceed assuming that the control unit 214 determines to hand over the UE 100 to the cell C12 of the base station 210A2.
  • Step S104 Network communication unit 213 of base station 210A1 transmits a handover request message to base station 210A2.
  • the network communication unit 213 of the base station 210A2 receives the handover request message from the base station 210A1.
  • the handover request message is a message requesting preparation of resources for handover of the UE 100.
  • the handover request message is sent after performing the pre-configuration procedure.
  • the handover request message includes pre-configuration information (Pre-configuration) regarding the pre-configuration procedure.
  • the controller 214 can include pre-configuration information in the handover request message.
  • the pre-configuration information may include suspend configuration information sent to the UE 100 in the pre-configuration procedure.
  • the control unit 214 may include suspend setting information in the handover request message based on the expectation information. For example, the control unit 214 may include suspend setting information in the handover request message when the expectation information indicates that the transition to the RRC inactive state is expected. Also, when transmitting the suspend setting information to the UE 100, the control unit 214 may include the suspend setting information in the handover request message.
  • the handover request message may contain handover preparation information used to transfer information used during handover preparation to the target base station to which handover is to be made.
  • the handover preparation information may include RRC reconfiguration generated by base station 210A1. Therefore, the handover request message contains the RRC reconfiguration.
  • the RRC reconfiguration in the handover request message may contain preconfiguration information.
  • the handover preparation information may include pre-configuration information within RRC re-configuration or may include pre-configuration information outside of RRC re-configuration.
  • the handover request message may include pre-configuration information within the handover preparation information and may include pre-configuration information outside of the handover preparation information.
  • control unit 214 of the base station 210A2 may determine that the suspend setting information is set in the UE 100 when the handover request message includes a pre-setting procedure. On the other hand, the control unit 214 may determine that the suspend setting information is not set in the UE 100 when the pre-setting procedure is not included in the handover request message.
  • control unit 214 of the base station 210A2 approves the handover request of the UE 100, it executes the process of step S105. Note that the control unit 214 may transmit a handover rejection message when not approving the handover request.
  • Step S105 The network communication unit 213 of the base station 210A2 transmits a handover request acknowledgment message to the base station 210A1.
  • Network communication unit 213 of base station 210A1 receives the handover request acknowledgment message from base station 210A2.
  • a handover request acknowledgment message is a message to inform the source base station about resources prepared at the target base station.
  • the handover request acknowledgment message is a response message to the handover request.
  • Step S106 The radio communication unit 212 of the base station 210A1 transmits to the UE 100 an RRC reconfiguration message used for performing handover from (the cell C11 of) the base station 210A1 to (the cell C12 of) the base station 210A2.
  • Radio communication section 212 transmits an RRC reconfiguration message to UE 100 in response to the reception of the handover request acknowledgment message.
  • Communication unit 120 of UE 100 receives the RRC reconfiguration message.
  • UE100 performs the process of step S107 according to reception of an RRC reset message.
  • the RRC reconfiguration message includes at least the identifier of the handover destination cell C12 and all the information necessary to access cell C12.
  • Step S107 Controller 130 of UE 100 executes a random access procedure between UE 100 and base station 210A2 in order to execute handover of base station 210A2 to cell C12. Thereby, the control unit 130 of the UE 100 moves the RRC connection to the base station 210A2. An RRC connection is established between UE 100 and base station 210A2 (cell C12). The control unit 130 of the UE 100 executes the process of step S108.
  • Step S108 Communication unit 120 of UE 100 transmits an RRC reconfiguration complete message to base station 210A2 (cell C12).
  • the radio communication unit 212 of the base station 210A2 receives the RRC reconfiguration complete message from the UE100.
  • the control unit 130 of the UE 100 retains the suspend setting information received by the RRC reconfiguration message in step S102 even after handover is executed.
  • the UE 100 is located in cell C12 managed by base station 210A2 of first network 200A, and located in cell C2 managed by base station 210B of second network 200B.
  • UE 100 is in an RRC connected state in first network 200A and is communicating in first network 200A.
  • the UE 100 receives services such as voice communication from the first network 200A, for example.
  • “during communication in the first network” means that the UE 100 is at least in an RRC connected state in the first network 200A, and does not necessarily have to continuously exchange data with the first network 200A. good.
  • the UE 100 is in the RRC idle state in the second network 200B.
  • the UE 100 may be in the RRC inactive state in the second network 200B.
  • UE 100 monitors paging from second network 200B while maintaining the RRC connected state in first network 200A.
  • the UE 100 can monitor paging, for example, during a communication interruption period with the first network 200A.
  • communication between UE 100 (RRC processing unit 131) and base station 210A2 is, for UE 100, UE 100 (RRC processing unit 131) and cell C12 of base station 210A2, that is, the cell in which UE 100 is located. It may be communication with C12. Communication between UE 100 (RRC processing unit 131) and base station 210B (cell C2) is the same.
  • Communication between UE 100 and nodes belonging to first network 200A may be referred to as communication between UE 100 and first network 200A.
  • first network 200A eg, base station 210A (cell C1), mobility management device 221A, gateway device 222A
  • second network 200B Communication between UE 100 and nodes belonging to the second network 200B.
  • the RRC processing unit 131 and the NAS processing unit 132 of the UE 100 communicate with the first network 200A (specifically, transmit/receive/notify messages, etc.) via the communication unit 120.
  • the description of communication via the communication unit 120 will be omitted as appropriate.
  • the explanation that the communication between the RRC processing unit 131 and the NAS processing unit 132 of the UE 100 and the second network 200B is communication via the communication unit 120 will be omitted as appropriate. Therefore, the transmission and/or reception of messages by the RRC processing unit 131 and NAS processing unit 132 of the UE 100 may be transmission and/or reception of messages by the communication unit of the UE 100 .
  • each of the mobility management device 221A, which is the core network device of the first network 200A, and the mobility management device 221B, which is the core network device of the second network 200B, is an AMF.
  • Step S201 The AMF 221B transmits a paging request requesting transmission of paging addressed to the UE 100 to the base station 210B.
  • Network communication unit 213 of base station 210B receives the paging request.
  • a paging request may include paging reason information (Paging Cause) that indicates the reason for paging.
  • the paging reason information may indicate, for example, whether the reason for paging is a voice call.
  • Step S202 The radio communication unit 212 of the base station 210B transmits a paging message (Paging) addressed to the UE 100 in response to receiving the paging request.
  • the communication unit 120 of the UE 100 receives the paging message from the base station 210B.
  • Communication unit 120 receives a paging message from second network 200B during communication in the RRC connected state in first network 200A.
  • a paging message is used to notify one or more UEs 100.
  • a paging message is an RRC layer message.
  • a paging message contains the identifier (ID) of UE100, for example. More specifically, for example, the paging message includes a list of paging records, and one paging record in the list includes the UE 100 ID. For example, the ID is UE 100's 5G-S-TMSI or full I-RNTI (Inactive Radio Network Temporary Identifier).
  • the paging message may contain paging reason information.
  • the paging reason information may be associated with the ID of the UE 100, for example.
  • RRC processing section 131 When the paging message includes the ID of UE 100 and UE 100 is in the RRC inactive state for second network 200B while communicating with first network 200A, RRC processing section 131 performs the process of step S105. can run.
  • RRC processing section 131 may be in a case where the paging message includes the ID of UE 100 and UE 100 is not communicating with first network 200A. If it is in the active state, it may perform the specified processing upon receiving the paging message without performing the subsequent processing.
  • Step S203 The RRC processing unit 131 provides a paging reception notification to the NAS processing unit 132 .
  • the NAS processing unit 132 receives from the paging reception notification.
  • the paging reception notification is for notifying that the UE 100 has received paging.
  • the RRC processing unit 131 may indicate to the NAS processing unit 132 that the paging message has been received when the UE 100 is in the RRC inactive state by the paging reception notification.
  • the paging reception notification may include paging reason information. Note that the paging reception notification may include the identifier of the UE 100, for example, when the UE 100 is in the RRC idle state.
  • the NAS processing unit 132 determines the priority of communication with the first network 200A and communication with the second network 200B. Specifically, the NAS processing unit 132 determines which of the communication with the first network 200A and the communication with the second network 200B corresponding to paging is prioritized (or which one is preferred). Note that the NAS processing unit 132 may determine which of the connection with the first network 200A and the connection with the second network 200B is more important.
  • the NAS processing unit 132 determines which of the communication with the first network 200A and the communication with the second network 200B corresponding to paging should be prioritized based on the service provided by the first network 200A. You can For example, when the NAS processing unit 132 receives the paging reason information, based on the paging reason indicated by the paging reason information, the NAS processing unit 132 separates communication with the first network 200A and communication with the second network 200B corresponding to paging. You may decide which one to give priority to. In this operation example, the NAS processing unit 132 determines that communication with the second network 200B that supports paging has priority over communication with the first network 200A.
  • Step S204 The NAS processing unit 132 provides a switching notification instruction (long time switch instruction) to the RRC processing unit 131 .
  • the RRC processing unit 131 receives the switching notification instruction from the NAS processing unit 132 .
  • the switch notification instruction instructs the RRC processing unit 131 to transmit a switch notification (long time switch).
  • the switching notification instruction may instruct transmission of an inactive switching notification described later, or may instruct transmission of an idle switching notification described later.
  • the NAS processing unit 132 may instruct transmission of an inactivity switching notification when expecting a transition to the RRC inactive state.
  • the NAS processing unit 132 may instruct transmission of an idle switching notification when expecting a transition to the RRC idle state.
  • the NAS processing unit 132 Based on at least one of the service provided by the first network 200A and the paging reason information (paging reason), the NAS processing unit 132 expects a transition to the RRC inactive state or waits for a transition to the RRC idle state. It may decide whether to expect a transition. In this operation, it is assumed that the NAS processing unit 132 has decided to expect a transition to the RRC inactive state. Therefore, the switching notification instruction instructs transmission of an inactive switching notification.
  • Step S205 The RRC processing unit 131 controls transmission of switching notification to the first network 200A.
  • the RRC processing unit 131 transmits a switching notification to the base station 210A2 using an RRC message.
  • the radio communication unit 212 of the base station 210A2 receives the switching notification from the UE100.
  • the switch notification is a notification to temporarily leave the first network 200A in order to switch communication from the first network 200A to the second network 200B. More specifically, the switching notification is a notification to the effect that the first network 200A will transition from the RRC connected state (that is, leave).
  • a switch notification may be referred to as an inactive switch notification when it indicates that the first network 200A expects a transition from the RRC connected state to the RRC inactive state. Therefore, the inactive switching notification is, for example, a switching notification including expectation information (RRC_INACTIVE expectation) indicating that the first network 200A expects a transition from the RRC connected state to the RRC inactive state.
  • the RRC processing unit 131 transmits an inactive switching notification as the switching notification.
  • the switching notification may be referred to as an idle switching notification when it indicates that the first network 200A expects a transition from the RRC connected state to the RRC idle state. Therefore, the idle switching notification may be, for example, a switching notification including expectation information (RRC_IDLE expectation) indicating that the first network 200A expects a transition from the RRC connected state to the RRC idle state.
  • RRC_IDLE expectation expectation information
  • Step S206 The RRC processing unit 131 starts a reception timer.
  • the RRC processing unit 131 starts the reception timer in response to the transmission of the inactivity switching notification in step S205.
  • the RRC processing unit 131 holds a reception timer.
  • the reception timer is a timer that counts a predetermined time after the inactivity switching notification is transmitted to the first network 200A. Therefore, the receive timer expires after the predetermined time has elapsed. The operation of UE 100 when the reception timer expires will be described later.
  • the RRC processing unit 131 may receive from the first network 200A a timer value indicating a predetermined time to be set in the reception timer.
  • the RRC processing unit 131 may receive, for example, a timer value from the base station 210A2 (cell C12).
  • the RRC processing unit 131 may receive the timer value by, for example, an RRC reconfiguration message.
  • the timer value may have been received by the UE 100 from the base station 210A1 (cell C11) in step S102, or may have been received at another timing.
  • Step S207 The radio communication unit 212 of the base station 210A2 transmits to the UE 100 a switch notification response (long time switch response) that is a response to the switch notification.
  • the UE 100 cannot receive the switching notification response.
  • base station 210A2 transmits an RRC release message to UE 100, UE 100 may not be able to receive the RRC release message.
  • Step S208 The reception timer expires when a predetermined period of time elapses from the transmission of the switching notification.
  • Step S209 When the RRC processing unit 131 does not receive a response to the inactive switching notification from the first network 200A, the RRC processing unit 131 switches from the RRC connected state to the RRC inactive state in the first network 200A using the suspend setting information held in step S102. Perform transition control. If the control unit 130 of the UE 100 does not receive a response to the inactivity switching notification from the first network 200A by the time the reception timer expires, it uses the retained suspend setting information to exit the RRC connected state in the first network 200A. Control to transition to the RRC inactive state may be performed. For example, the control unit 130 can apply parameter values included in the retained suspend setting information. Therefore, the UE 100 can autonomously transition to the RRC inactive state even if it does not receive the switching notification response.
  • Step S210 After transitioning to the RRC inactive state in first network 200A, UE 100 communicates with second network 200B.
  • Second Operation Example With reference to FIG. 7, a second operation example will be described, mainly focusing on differences from the above-described operation example.
  • the second operation example a case will be described in which the UE 100 receives a response to the switching notification before the reception timer expires. Note that the operations before the operations in FIG. 7 are the same as those in the first operation example, so descriptions thereof will be omitted.
  • Steps S301 to S306 This is the same as steps S201 to S206.
  • Step S307 The radio communication unit 212 of the base station 210A2 transmits a switching notification response to the UE100.
  • the RRC processing unit 131 receives the switching notification response from the base station 210A2.
  • a switch notification response is sent by an RRC message.
  • the radio communication unit 212 of the base station 210A2 transmits an RRC release message to the UE100.
  • Communication unit 120 (RRC processing unit 131) of UE 100 receives the RRC release message from base station 210A2.
  • the RRC release message may contain suspend configuration information.
  • the suspend setting information may be the same as or different from the suspend setting information included in the RRC reconfiguration message in step S102.
  • the control unit 214 of the base station 210A2 may include, in the suspend setting information, the same parameter value as the suspend setting information transmitted in step S102, for example.
  • the control unit 214 may include, in the suspend setting information, only parameter values updated from the suspend setting information transmitted in step S102, for example.
  • the control unit 214 does not have to include the parameter value (information element) to be applied to the UE 100 in the suspend setting information. That is, the suspend setting information does not include parameter values to be applied to the UE 100, and the contents of the suspend setting information may be absent.
  • Base station 210A2 may, for example, send an RRC release message as a handover notification response.
  • Step S308 The RRC processing unit 131 stops the reception timer.
  • the RRC processing unit 131 may stop the reception timer in response to receiving the switching notification response or the RRC release message.
  • Step S309 The RRC processing unit 131 (control unit 130), in response to stopping the reception timer or receiving the RRC release message, based on the suspend setting information included in the response, switches from the RRC connected state to the RRC connection in the first network 200A. Control to transition to the active state may be performed.
  • the RRC processing unit 131 can apply the parameter values included in the suspend setting information included in the RRC release message. For example, if the suspend setting information includes only some parameter values (information elements) or the suspend setting information does not include parameter values (information elements) that should be applied to the UE 100, the RRC processing unit 131 does not include the suspend setting information. may be updated and applied, and other parameter values already held in step 102 may be applied as is. Therefore, the UE 100 operates in the RRC inactive state in the first network 200A based on the suspend setting information received before handover.
  • Step S310 This is the same as step S210.
  • Step S401 The communication unit 120 of the UE 100 transmits a preset request message to the base station 210A1 as in step S101.
  • the radio communication unit 212 of the base station 210A1 receives the preset request message from the UE100.
  • the expectation information included in the preconfiguration request message may indicate, for example, that the first network 200A expects to transition to the RRC inactive state instead of the RRC idle state.
  • the expectation information may also indicate, for example, that the first network 200A expects at least a transition to the RRC inactive state.
  • the expectation information indicates, for example, that a transition to the RRC inactive state is expected in a predetermined case (hereinafter referred to as a first condition), and a case other than the predetermined case (hereinafter referred to as a second condition). appropriately called) to indicate that it expects to transition to the RRC idle state.
  • the first condition may be, for example, that the UE 100 is provided with a service that is expected to be continuously exchanged such as a voice call on the first network 200A at the time of transmission of the switching notification, which will be described later.
  • the second condition may be a case where the UE 100 is provided with a service for which continuous exchange is not assumed.
  • the first condition is, for example, that the UE 100 transmits information (a so-called busy indicator) indicating that communication with the first network 200A is prioritized over communication with the second network 200B to the second network 200B. No ongoing interaction between the UE 100 and the second network 200B, such as sending a switchover notification for the second network 200B, or renewing the registration of the second network 200B.
  • the second condition may be, for example, that the UE 100 responds to paging of the second network 200B. Also, the second condition may be that the UE 100 responds to the paging of the second network 200B and receives a service such as a voice call that is assumed to be continuous communication.
  • Steps S402 and S403 This is the same as steps S102 and S103.
  • Step S404 The network communication unit 213 of the base station 210A1 transmits a handover request message to the base station 210A2 as in step S104.
  • the control unit 214 of the base station 210A1 may include preset information in the handover request message. Specifically, the control unit 214 may include the suspend setting information and the expectation information received from the UE 100 in the handover request message.
  • the control unit 214 of the base station 210A2 may generate suspend setting information based on preset information included in the handover request message.
  • the control unit 214 generates suspend setting information (hereinafter referred to as second suspend setting information) based on, for example, suspend setting information (hereinafter referred to as first suspend setting information) received from the base station 210A1.
  • the second suspend setting information is suspend setting information applied to the UE 100 after handover.
  • the control unit 214 may generate the second suspend setting information based on the expectation information received from the base station 210A1.
  • the parameter value included in the second suspend setting information may be the same parameter value as the first suspend setting information, or may be a different parameter value.
  • the second suspend setting information may include only parameter values different from the parameter values included in the first suspend setting information.
  • Step S405 The network communication unit 213 of the base station 210A2 transmits a handover request acknowledgment message to the base station 210A1, as in step S105.
  • the control unit 214 may include the second suspend setting information (suspendConfig) as information to be transmitted to the UE 100 in the handover request acknowledge message.
  • the control unit 214 includes full configuration information (fullConfig) for releasing the setting information set in the UE 100 from the handover source cell C11 in the handover request approval message. No.
  • the control unit 214 may include the full configuration information in the handover request approval message.
  • Step S406 Similarly to step S106, the radio communication unit 212 of the base station 210A1 transmits to the UE 100 an RRC reconfiguration message used for executing handover from (the cell C11 of) the base station 210A1 to (the cell C12 of) the base station 210A2. Send.
  • the communication unit 120 of the UE 100 receives the RRC reconfiguration message from the cell C11.
  • the control unit 214 of the base station 210A1 may include information to be transmitted to the UE 100 included in the handover request acknowledge message (eg, second suspend setting information, full configuration information, etc.) in the RRC reconfiguration message.
  • information to be transmitted to the UE 100 included in the handover request acknowledge message eg, second suspend setting information, full configuration information, etc.
  • Step S407 Based on the RRC reconfiguration message, the control unit 130 of the UE 100 determines whether or not to omit the preconfiguration procedure between the UE 100 and the cell C12 after handover to the cell C12.
  • the control unit 130 may execute the determination operation shown in FIG. 9 . The determination operation will be described later.
  • Steps S408 and S409 This is the same as steps S107 and S108.
  • Step S410 The wireless communication unit 212 of the base station 210A2 broadcasts a system information block (SIB).
  • SIB system information block
  • Communication unit 120 of UE 100 receives the SIB from cell C12 (base station 210A2).
  • the SIB may contain support information indicating that cell C12 supports performing pre-configuration procedures. If cell C12 supports execution of the pre-configuration procedure, the controller 214 of base station 210A2 may include support information in the SIB indicating that cell C12 supports execution of the pre-configuration procedure. On the other hand, if the cell C12 does not support the execution of the pre-configuration procedure, the control unit 214 may include support information in the SIB indicating that the cell C12 does not support the execution of the pre-configuration procedure. Alternatively, the control unit 214 may not include the support information in the SIB.
  • the control unit 130 of the UE 100 may determine, based on the SIB, whether or not to execute the preset procedure after handover to cell C12. For example, when the SIB includes support information indicating that the cell C12 supports execution of the pre-configuration procedure, the control unit 130 determines to perform the pre-configuration procedure after the handover to the cell C12. In this case, the control unit 130 may execute the process of step S411. On the other hand, if the SIB does not include support information indicating that the cell C12 supports execution of the pre-configuration procedure, the control unit 130 determines to omit the pre-configuration procedure after the handover to the cell C12. In this case, the control unit 130 may omit the process of step S411.
  • Step S411 The communication unit 120 of the UE 100 transmits a preset request message to the base station 210A2 as in step S101.
  • the radio communication unit 212 of the base station 210A2 receives the preset request message from the UE100.
  • Step S412 The radio communication unit 212 of the base station 210A2 transmits the RRC reconfiguration message to the UE 100 as in step S102.
  • the communication unit 120 of the UE 100 receives the RRC reconfiguration message from the base station 210A.
  • the subsequent operation is the same as the first operation example or the second operation example.
  • Example of judgment operation A determination operation example of the UE 100 will be described with reference to FIG. 9 .
  • Step S501 Control unit 130 determines whether the RRC reconfiguration message includes full configuration information. That is, the control unit 130 determines whether or not to execute a full configuration procedure for releasing the setting information set in the UE 100 . The control unit 130 determines to execute the full configuration procedure when the RRC reconfiguration message includes the full configuration information. The control unit 130 determines not to perform the full configuration procedure when the RRC reconfiguration message does not include the full configuration information. Therefore, if the RRC reconfiguration message includes full configuration information (Yes), the process of step S507 is executed. On the other hand, if the RRC reconfiguration message does not contain full configuration information (No), the process of step S502 is executed.
  • Step S502 The control unit 130 determines whether the RRC reconfiguration message includes suspend setting information (that is, second suspend setting information). If the RRC reset message includes suspend setting information (Yes), the process of step S503 is executed. On the other hand, if the RRC reconfiguration message does not include suspend setting information (No), the process of step S507 is executed.
  • suspend setting information that is, second suspend setting information
  • Step S503 The control unit 130 determines to omit the pre-configuration procedure after the handover to the cell C12. Note that the control unit 130 may consider that the pre-setting information is handed over from the cell C11 to the cell C12 by including the suspend setting information in the RRC re-setting message.
  • Step S504 Control unit 130 determines whether or not there is content in suspend setting information (that is, second suspend setting information). That is, the control unit 130 determines whether or not the suspend setting information includes parameter values (information elements) to be applied to the UE 100 . If there is suspend setting information content, or if the suspend setting information does not include the parameter value to be applied to the UE 100 (Yes), the process of step S505 is executed. On the other hand, if there is suspend setting information content, that is, if the suspend setting information does not include the parameter value to be applied to the UE 100 (No), the process of step S506 is executed.
  • suspend setting information that is, second suspend setting information
  • Step S505 Based on the parameter values (information elements) included in the suspend setting information (ie, the second suspend setting information), the control unit 130 determines the parameters included in the held suspend setting information (ie, the first suspend setting information). Update value. That is, control unit 130 updates the parameter values included in the first suspend setting information received in the pre-setting procedure, based on the parameter values included in the second suspend setting information.
  • Step S506 The control unit 130 maintains the parameter values included in the retained suspend setting information (that is, the first suspend setting information).
  • Step S507 The control unit 130 discards (or releases) the retained suspend setting information (that is, the first suspend setting information).
  • the control unit 130 may erase (or clear) the parameter value included in the first suspend setting information.
  • the control unit 130 may determine that the pre-setting procedure is to be executed in the cell C12 after handover.
  • the control unit 130 may determine to perform the pre-configuration procedure in cell C12 after handover if the SIB from cell C12 includes the aforementioned support information. Note that the control unit 130 may consider that the preset information has not been handed over from the cell C11 to the cell C12.
  • the switching notification for each operation example may be called a long time switch, or may be called another name.
  • the switching notification may be, for example, a message or information element used in a switching procedure for leaving RRC_CONNECTED state.
  • the base station 210A1 transmits the suspend setting information to the UE 100 using the RRC reconfiguration message in response to receiving the preset request message, but this is not the only option.
  • the base station 210A1 may transmit the suspend configuration information to the UE 100 using the RRC reconfiguration message even if it does not receive the preset request message.
  • the base station 210A may transmit suspend setting information to the UE 100 using an RRC message other than the RRC reconfiguration message and the RRC release message.
  • the timer value may be stored in the UE 100 in advance. Therefore, the UE 100 does not have to receive the timer value from the first network 200A.
  • the reception timer is used to control the transition to the RRC inactive state, but this is not the only option.
  • the control unit 130 of the UE 100 for example, when the reception strength and/or reception quality of the radio signal from the cell C1 of the base station 210 is below a threshold value, determines to transition to the RRC inactive state, and the process of step S111. may be started.
  • base station 210A1 may, for example, include the latest Suspend setting information may be included.
  • each operation flow described above is not limited to being implemented independently, but can be implemented by combining two or more operation flows. For example, some steps of one operation flow may be added to another operation flow, or some steps of one operation flow may be replaced with some steps of another operation flow.
  • a program that causes a computer to execute each process performed by the UE 100 or the base station 210 may be provided.
  • the program may be recorded on a computer readable medium.
  • a computer readable medium allows the installation of the program on the computer.
  • the computer-readable medium on which the program is recorded may be a non-transitory recording medium.
  • the non-transitory recording medium is not particularly limited, but may be, for example, a recording medium such as CD-ROM (Compact Disk Read Only Memory) or DVD-ROM (Digital Versatile Disc Read Only Memory). good.
  • circuits for executing each process performed by the UE 100 or the base station 210 may be integrated, and at least a part of the UE 100 or the base station 210 may be configured as a semiconductor integrated circuit (chipset, SoC (System On Chip)).
  • “transmit” may mean performing processing of at least one layer in the protocol stack used for transmission, or transmitting signals wirelessly or by wire. It may mean physically transmitting. Alternatively, “transmitting” may mean a combination of performing the at least one layer of processing and physically transmitting the signal wirelessly or by wire. Similarly, “receive” may mean performing processing of at least one layer in the protocol stack used for reception, or physically receiving a signal wirelessly or by wire. may mean that Alternatively, “receiving” may mean a combination of performing the at least one layer of processing and physically receiving the signal wirelessly or by wire.
  • a user equipment (100) that uses a first subscriber identity module (111) to communicate with a first network (200A) and a second subscriber identity module (112) to communicate with a second network (200B).
  • a control unit (130) that performs a pre-configuration procedure for configuring a transition to the RRC inactive state; receiving from said first cell (cell C11) an RRC reconfiguration message used to perform a handover from said first cell (cell C11) to a second cell (cell C12) of said first network (200A);
  • a communication unit (120) Based on the RRC reconfiguration message, the control unit (130), after handover to the second cell (cell C12), between the user equipment (100) and the second cell (cell C12) user equipment.
  • the communication unit (120) receives suspend setting information indicating setting of transition to the RRC inactive state from the first cell (cell C11) in the pre-setting procedure,
  • the control unit (130) controls the preliminary 3.
  • the communication unit (120) receives suspend setting information indicating setting of transition to the RRC inactive state from the first cell (cell C11) in the pre-setting procedure, If the suspend setting information included in the RRC reconfiguration message does not include a parameter value to be applied to the user equipment (100), the control unit (130) suspends the suspend received in the pre-configuration procedure. 5.
  • the user equipment according to appendix 4 which maintains parameter values included in the configuration information.
  • the communication unit (120) receives suspend setting information indicating setting of transition to the RRC inactive state from the first cell (cell C11) in the pre-setting procedure,
  • the control unit (130) performs the pre-configuration based on the parameter value. 6.
  • the communication unit (120) receives suspend setting information indicating setting of transition to the RRC inactive state from the first cell (cell C11) in the pre-setting procedure, If the RRC reconfiguration message does not include the suspend configuration information generated by the base station (210A2) that manages the second cell (cell C12), the control unit (130) receives the suspension configuration information in the preconfiguration procedure. 7. The user device according to any one of appendices 1 to 6, wherein the suspend setting information is discarded.
  • the communication unit (120) receives a system information block broadcast from the second cell (cell C12), The control unit (130) determines whether or not to execute the preset procedure after handover to the second cell (cell C12) based on the system information block. User equipment.
  • the control unit (130) controls the second cell (cell C12). ), determining to perform the pre-configuration procedure after handover to .

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

Abstract

Un dispositif utilisateur (100) qui communique avec un premier réseau (200A) à l'aide d'un premier module d'identification d'abonné (111) et un second réseau (200B) à l'aide d'un second module d'identification d'abonné (112) comprend : une unité de commande (130) qui réalise, avant la transmission d'une notification de commutation pour passer d'un état connecté RRC dans le premier réseau (200A) vers la communication avec le second réseau (200B), une procédure de réglage d'avance concernant le réglage de la transition vers un état interactif RRC entre le dispositif utilisateur (100) et une première cellule (cellule C11) du premier réseau (200A); et une unité de communication (120) qui reçoit, de la première cellule (cellule C11), un message de reconfiguration RRC destiné à être utilisé pour exécuter un transfert de la première cellule (cellule C11) vers une seconde cellule (cellule C12) du premier réseau (200A). L'unité de commande (130) détermine, sur la base du message de reconfiguration RRC, s'il faut omettre la procédure de réglage d'avance entre le dispositif utilisateur (100) et la seconde cellule (cellule C12) après le transfert à la seconde cellule (cellule C12).
PCT/JP2022/024933 2021-06-30 2022-06-22 Dispositif utilisateur, dispositif de station de base et procédé de contrôle de communication WO2023276832A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020503781A (ja) * 2016-12-29 2020-01-30 エルジー エレクトロニクス インコーポレイティド Ｄｒｂを確立する方法及び装置
JP2020162106A (ja) * 2019-03-28 2020-10-01 シャープ株式会社 端末装置、方法、および、集積回路

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Publication number Priority date Publication date Assignee Title
JP2020503781A (ja) * 2016-12-29 2020-01-30 エルジー エレクトロニクス インコーポレイティド Ｄｒｂを確立する方法及び装置
JP2020162106A (ja) * 2019-03-28 2020-10-01 シャープ株式会社 端末装置、方法、および、集積回路

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