WO2023145094A1 - 無線通信装置、通信方法及び通信プログラム - Google Patents
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- H—ELECTRICITY
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- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication device, a communication method, and a communication program.
- DC Dual Connectivity
- a terminal device wirelessly connects to a plurality of base station devices including a master base station device and a secondary base station device, and wirelessly uses the carrier of each base station device (hereinafter sometimes referred to as a "cell group"). It is a technology for communication.
- eNodeB 4G-advanced radio access technology
- MR-DC Multi Radio Dual Connectivity
- gNB gNodeB
- MR-DC for example, when the amount of data to be transmitted and received is large, the terminal device transmits and receives data to and from both the master base station device and the secondary base station device.
- the terminal device deactivates a cell group (secondary cell group) belonging to the secondary base station device, and the secondary base station device and It is being considered to save power by temporarily suspending data transmission and reception.
- the procedure by which the base station device deactivates or activates the secondary cell group of the terminal device has not been determined as a standardized specification. Then, for example, when transmission of control data in each protocol occurs when the secondary cell group of the terminal device is in an inactive state, it is necessary to activate the secondary cell group and transmit the control data. There is a problem of consuming
- the disclosed technology has been made in view of this point, and aims to provide a wireless communication device, a communication method, and a communication program capable of suppressing an unnecessary increase in power consumption.
- a wireless communication device disclosed by the present application comprises a transmitting unit that transmits a message to another wireless communication device, and a processing unit that performs processing on the message transmitted by the transmitting unit.
- the processing unit includes a first parameter in a first RRC (Radio Resource Control) message transmitted to the other wireless communication device, and includes a first DRB (Data Radio If a second parameter is included in the Bearer) configuration parameters, then a third parameter is included in the first DRB configuration parameters.
- RRC Radio Resource Control
- DRB Data Radio If a second parameter is included in the Bearer
- wireless communication device According to one aspect of the wireless communication device, communication method, and communication program disclosed by the present application, it is possible to suppress an unnecessary increase in power consumption.
- FIG. 1 is a diagram showing a configuration example of a communication system.
- FIG. 2 is a block diagram showing a configuration example of a base station apparatus.
- FIG. 3 is a block diagram showing a configuration example of a terminal device.
- FIG. 4 is a diagram showing an example of a U-Plane protocol stack.
- FIG. 5 is a diagram showing an example of a C-Plane protocol stack.
- FIG. 6 is a diagram showing a specific example of parameters of the RRC message.
- FIG. 7 is a diagram showing a specific example of parameters of the RRC message.
- FIG. 8 is a diagram showing a configuration example of a cell group of a communication system.
- FIG. 9 is a diagram for explaining types of MR-DC.
- FIG. 1 is a diagram showing a configuration example of a communication system.
- FIG. 2 is a block diagram showing a configuration example of a base station apparatus.
- FIG. 3 is a block diagram showing a configuration example of a terminal device
- FIG. 10 is a diagram for explaining resetting with synchronization.
- FIG. 11 is a diagram illustrating transmission of an end marker control PDU.
- FIG. 12 is a sequence diagram showing a transition operation to SCG deactivation.
- FIG. 13 is a sequence diagram showing RRC message transmission/reception operations during SCG deactivation.
- FIG. 14 is a sequence diagram showing the SCG reactivation operation.
- FIG. 15 is a diagram showing a specific example of mode transition.
- FIG. 16 is a sequence diagram showing RRC message transmission/reception operations during radio bearer suspension.
- FIG. 17 is a sequence diagram showing RRC message transmission/reception operations that control uplink transmission.
- FIG. 1 is a diagram showing a configuration example of a communication system.
- the communication system shown in FIG. 1 has a terminal device 100, base station devices 200-1 and 200-2, and a core network 300.
- FIG. This communication system may be a wireless communication system in which the terminal device 100 communicates with the base station device 200-1 or the base station device 200-2.
- a wireless communication system that communicates with the station apparatus 200-2 and MR-DC may be used.
- the base station device 200-1 is the master base station device
- the base station device 200-2 is the secondary base station device.
- a master base station apparatus may be called MN (master node: Master Node)
- SN secondary node: Secondary Node
- the terminal device 100 wirelessly connects to one or both of the base station devices 200-1 and 200-2 and performs wireless communication.
- RATs Radio Access Technology
- the terminal device 100 is a tablet terminal or smart phone compatible with one or both of E-UTRA and NR.
- the base station devices 200-1 and 200-2 are wireless communication devices that wirelessly connect with the terminal device 100 and perform wireless communication. Also, the base station apparatuses 200-1 and 200-2 are connected to each other by wire, for example, and communicate with each other.
- the base station device 200 is connected to the core network 300 by wire, for example, and performs communication.
- the base station apparatus 200 corresponds to, for example, eNodeB when E-UTRA is the RAT and gNodeB when the NR is the RAT.
- the core network 300 is a network compatible with any generation of mobile communication systems. That is, the core network 300 is, for example, a core network supporting 5G (hereinafter sometimes referred to as "5GC"), an EPC (Evolved Packet Core) supporting 4G, or the like.
- 5GC core network supporting 5G
- EPC Evolved Packet Core
- FIG. 2 is a block diagram showing a configuration example of the base station apparatus 200.
- the base station device 200 is a communication device or relay device having a processor 210 , a storage 220 , a memory 230 , a wireless communication circuit 240 and a network interface (NI: Network Interface) 250 .
- NI Network Interface
- the storage 220 is an auxiliary storage device such as flash memory, HDD (Hard Disk Drive) or SSD (Solid State Drive) that stores programs and data.
- the storage 220 stores a wireless communication program 221 and a base station side program 222 .
- the memory 230 is an area into which programs stored in the storage 220 are loaded. Also, the memory 230 may be used as an area where programs store data.
- the wireless communication circuit 240 is a circuit that wirelessly connects with the terminal device 100 and performs communication.
- the base station device 200 receives a signal transmitted from the terminal device 100 via the radio communication circuit 240 and transmits the signal to the terminal device 100 .
- the NI 250 is, for example, a communication device that connects with another base station device 200 and realizes inter-base station communication. Also, the NI 250 is a communication device that connects to, for example, the core network 300 (a communication device that configures the core network 300) and performs communication. As the NI 250, for example, a NIC (Network Interface Card) can be used. Base station apparatus 200 receives signals transmitted from other communication apparatuses via NI 250 and transmits signals to other communication apparatuses.
- the processor 210 has, for example, a CPU (Central Processing Unit), etc., loads a program stored in the storage 220 into the memory 230, executes the loaded program, builds each processing unit, and realizes various processes. .
- a CPU Central Processing Unit
- This wireless communication process is a process of wirelessly connecting with the terminal device 100, wirelessly communicating with the terminal device 100, or relaying communication performed by the terminal device 100 with another communication device.
- the processor 210 builds a transmitting unit, a receiving unit and a processing unit by executing the base station side program 222, and performs base station side processing.
- the base station side processing may include MR-DC master node processing and MR-DC secondary node processing.
- the MR-DC master node processing is processing for controlling the master node side in the MR-DC
- the MR-DC secondary node processing is processing for controlling the secondary node side in the MR-DC.
- the base station apparatus 200 performs communication corresponding to each type of MR-DC described later in the MR-DC master node process and the MR-DC secondary node process.
- FIG. 3 is a block diagram showing a configuration example of the terminal device 100.
- Terminal device 100 is a communication device having processor 110 , storage 120 , memory 130 and wireless communication circuit 140 .
- the storage 120 is an auxiliary storage device such as flash memory, HDD or SSD that stores programs and data.
- the storage 120 stores a wireless communication program 121 and a terminal side program 122 .
- the memory 130 is an area into which programs stored in the storage 120 are loaded. In addition, the memory 130 may be used as an area where programs store data.
- the wireless communication circuit 140 is a circuit that wirelessly connects with the base station device 200 and performs communication.
- the terminal device 100 receives a signal transmitted from the base station device 200 via the radio communication circuit 140 and transmits the signal to the base station device 200 .
- the wireless communication circuit 140 for example, a network card that supports wireless connection can be used.
- the processor 110 loads a program stored in the storage 120 into the memory 130, executes the loaded program, constructs each processing unit, and implements various types of processing.
- the processor 110 performs wireless communication processing by executing the wireless communication program 121 .
- This wireless communication processing is processing for wirelessly connecting with the base station device 200 , wirelessly communicating with the base station device 200 , and communicating with other communication devices via the base station device 200 .
- the processor 110 executes the terminal-side program 122 to construct a transmitting unit and a receiving unit processing unit, and performs terminal-side processing.
- the terminal-side processing may include terminal-side MR-DC processing.
- the terminal-side MR-DC processing is processing for controlling communication in the MR-DC.
- the terminal device 100 performs communication corresponding to each type of MR-DC described later in the terminal-side MR-DC processing.
- Protocol stack An example protocol stack for a communication system will be described. In a communication system, a hierarchical structure of a series of protocols for transmitting and receiving data is called a protocol stack. Below, the case where the base station apparatus 200 is eNB or gNB and the core network 300 is EPC or 5GC will be described. Also, it is assumed that the terminal device 100 (UE: User Equipment) supports one or both of E-UTRA and NR.
- UE User Equipment
- the protocol stacks of the U-Plane (User Plane) and C-Plane (Control Plane) are described below.
- the U-Plane corresponds to, for example, a data signal (message) of transmitted/received user data.
- the C-Plane corresponds to, for example, control signals (messages) transmitted and received in communication.
- FIG. 4 is a diagram showing an example of a U-Plane protocol stack when the core network 300 is 5GC.
- FIG. 5 is a diagram showing an example of a C-Plane protocol stack when the core network 300 is 5GC.
- SDAP, PDCP, RLC, MAC, PHY, NAS, and RRC in FIGS. 4 and 5 indicate layer names, respectively.
- each of SDAP, PDCP, RLC, MAC, PHY, NAS and RRC may be attached with a sublayer or layer and called, for example, "SDAP sublayer" or "SDAP layer”.
- SDAP, PDCP, RLC, MAC, PHY, NAS and RRC may each be given an entity and called, for example, an "SDAP entity”.
- the U-Plane protocol stack when the core network 300 is EPC is a protocol stack in which SDAP does not exist in FIG. That is, when the core network 300 is EPC, the U-Plane protocol stack consists of PDCP, RLC, MAC and PHY.
- the C-Plane protocol stack when the core network 300 is the EPC has a form in which the NAS shown in FIG. 5 exists in the MME (Mobility Management Entity) instead of the AMF.
- MME Mobility Management Entity
- each layer may or may not be common between the E-UTRA and NR RATs.
- E-UTRA and NR RATs.
- the description is about functions common to E-UTRA and NR.
- the U-Plane is composed of SDAP (Service Data Adaptation Protocol), PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), MAC (Medium Access Control) and PHY (PHYsical).
- SDAP Service Data Adaptation Protocol
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- PHY PHYsical
- UE and base station apparatus 200 (gNB).
- the PHY is a radio physical layer, and transmits control information and data between the terminal device 100 and the base station device 200 using a physical channel.
- the direction from the base station device 200 to the terminal device 100 may be called a downlink (downlink, DL), and the direction from the terminal device 100 to the base station device 200 may be called an uplink (uplink, UL).
- the PHY is connected to the MAC, which is the upper layer, by a transport channel, and data moves between the PHY and the MAC via the transport channel. .
- MAC is the medium access control layer, mapping transport channels and logical channels (LCH), multiplexing/demultiplexing of MAC SDUs, scheduling reports, error correction through HARQ (Hybrid Automatic Repeat reQuest), priority control, etc. conduct.
- LCH mapping transport channels and logical channels
- HARQ Hybrid Automatic Repeat reQuest
- the MAC is connected to RLC, which is an upper layer, by a logical channel, and data moves between the MAC and the RLC via the logical channel.
- SDU Service Data Unit
- PDU Protocol Data Unit
- RLC, PDCP, and SDAP include PDUs for control, and these PDUs are sometimes called control PDUs.
- Other PDUs may also be referred to as data PDUs to distinguish them from control PDUs.
- RLC is a radio link control layer and has three modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM).
- TM RLC is sometimes called TM RLC
- UM RLC is called UM RLC
- AM RLC is called AM RLC.
- RLC on the transmitting side, transfers PDUs of PDCP, which is an upper layer, assigns sequence numbers (in the case of UM or AM), divides data (in the case of UM or AM), and performs re-division (in the case of AM). .
- the RLC performs SDU reassembly (in the case of UM or AM), duplicate detection (in the case of AM), and discarding of RLC SDUs (in the case of UM or AM) on the receiving side.
- RLC performs RLC re-establishment, etc. on the transmitting and receiving sides.
- the RLC also performs data combining on the transmitting side and reordering and in-order delivery on the receiving side.
- Control PDUs used in RLC include, for example, status PDUs.
- the status PDU is used by the receiving side of the AM RLC entity to report to the AM RLC entity, which is the communication partner, about RLC data PDUs that have been successfully received and RLC data PDUs that have not been successfully received (that is, loss has been detected). It is a control PDU to do.
- PDCP is a packet data convergence protocol layer, U-Plane and C-Plane data transfer, PDCP sequence number management, header compression/decompression, encryption/decryption, integrity protection/integrity verification, timer-based SDU It does things like discarding, routing to split bearers, reordering and in-order delivery. Note that for E-UTRA, functions such as timer-based SDU discard, reordering and in-order delivery in PDCP may be limited to split bearers.
- a control PDU used in PDCP includes, for example, a PDCP status report.
- the PDCP status report is sent from the upper layer (RRC layer) to the AM DRB (described later) for which PDCP status report transmission is set, for example, PDCP entity re-establishment or PDCP It is sent in the uplink (UL) direction, such as when data recovery is requested.
- RRC layer the upper layer
- AM DRB the AM DRB
- the PDCP entity re-establishment process includes the following processes. Initialization of state variables in the UM DRB (see below) and SRB (see below) Application of security algorithms and security keys provided by higher layers Sending incomplete and/or successful transmission at the sender Transmission of data that does not exist ⁇ Transmission of PDCP status report (when PDCP status report transmission is set)
- the PDCP data recovery process includes the following processes: - Transmission of data that has not been successfully transmitted on the transmitting side - PDCP status report transmission (when PDCP status report transmission is set)
- SDAP is a service data adaptation protocol layer that maps QoS (Quality of Service) flows to Data Radio Bearers (DRB), and QoS to downlink (DL) and uplink (UL) packets. Marking of the flow identifier (QFI: QoS Flow Identifier) is performed.
- Control PDUs used in SDAP include end marker control PDUs, for example.
- IP Internet Protocol
- TCP Transmission Control Protocol
- UDP User Datagram Protocol
- Ethernet registered trademark
- layers such as IP, TCP, UDP and Ethernet may be included in the PDU layer.
- IMS IP Multimedia Subsystem
- the C-Plane of AS (Access Stratum) is composed of RRC (Radio Resource Control), PDCP, RLC, MAC and PHY, and terminates at terminal device 100 and base station device 200.
- the NAS (Non Access Stratum) C-Plane is composed of NAS and terminates between the terminal device 100 and the AMF (Access and Mobility Management Function), which is a device of the core network 300 .
- PDCP, RLC, MAC and PHY are the same as U-Plane.
- RRC broadcasts system information (SI: System Information) related to AS and NAS, paging, establishment/maintenance/release of RRC connection between terminal device 100 and base station device 200, addition/change of carrier aggregation (CA) /release, dual connectivity (DC) addition/change/release, security functions including security key management, signaling radio bearer (SRB) and data radio bearer (DRB) establishment/configuration/maintenance/release, It performs mobility functions, QoS management functions, control of terminal equipment measurement reports and reporting, radio link failure (RLF) detection and recovery, and NAS message transfer.
- SI System Information
- the NAS performs authentication, mobility management and security control. Note that, as described above, when the device of the core network 300 is the EPC, the NAS terminates between the terminal device 100 and the MME, which is the device of the core network 300 .
- Channels used in communication systems are described. Examples of channels corresponding to NR are shown below, but the channels to be used are not limited to the following. Channels with the same name can also be used for the same or similar purposes in RATs other than NR (eg, E-UTRA).
- Physical channel - A PBCH (Physical Broadcast CHannel) is a channel used to transmit broadcast information from the base station apparatus 200 to the terminal apparatus 100 .
- a PDCCH Physical Downlink Control Channel
- DCI Downlink Control Information
- a PDSCH Physical Downlink Shared CHannel
- a PDSCH is a channel used to transmit data, etc. from an upper layer from the base station device 200 to the terminal device 100 .
- a PUCCH Physical Uplink Control Channel
- UCI Uplink Control Information
- a PUSCH Physical Uplink Shared CHannel
- a PUSCH Physical Uplink Shared CHannel
- a PRACH Physical Random Access Channel
- a PRACH is a channel used to transmit a random access preamble and the like from the terminal device 100 to the base station device 200.
- Transport channel - BCH (Broadcast CHannel) is mapped to PBCH, which is a physical channel.
- DL-SCH DownLink Shared CHannel
- PDSCH DownLink Shared CHannel
- PCH Paging CHannel
- PDSCH Physical channel
- UL-SCH UpLink Shared CHannel
- PUSCH Physical channel
- RACH Random Access CHannel(s)
- PRACH Physical channel
- Logical channel - BCCH Broadcast Control CHannel
- BCCH Broadcast Control CHannel
- PCCH Paging Control CHannel
- CCCH Common Control Channel
- RRC Radio Resource Control Channel
- DCCH Dedicated Control Channel
- DCCH is a point-to-point bi-directional channel that transmits dedicated control information (such as RRC messages) between terminal device 100 and base station device 200, and establishes an RRC connection with base station device 200.
- the downlink is mapped to the transport channel DL-SCH and the uplink is mapped to the transport channel UL-SCH.
- DTCH Dedicated Transport CHannel
- DTCH is a bi-directional channel dedicated to point-to-point terminals and transmits user information (user data). Mapped to the port-channel UL-SCH.
- RRC message The RRC message will be explained.
- An RRC message is a message containing information necessary for communication in a cell, and includes MIB (Master Information Block), SIB (System Information Block), and the like. Parameters included in RRC messages are sometimes referred to as fields or information elements (IEs).
- IEs information elements
- the base station device 200 By transmitting an RRC message to the terminal device 100, the base station device 200 causes the terminal device 100 to execute processing according to the RRC message. In addition, the terminal device 100 receives the RRC message from the base station device 200 and performs processing according to the RRC message. Also, the terminal device 100 requests transmission of the RRC message from the base station device 200 by transmitting the RRC message to the base station device 200 . Also, the terminal device 100 notifies that the processing according to the RRC message received from the base station device 200 has been completed by transmitting the RRC message to the base station device 200 .
- the RRC message includes a message regarding the establishment of an RRC connection.
- messages related to establishment of RRC connection include RRC setup request message (RRCSetupRequest), RRC setup message (RRCSetup), RRC setup completion message (RRCSetupComplete), and the like.
- messages related to establishment of RRC connection include an RRC connection setup request message (RRCConnectionSetupRequest), an RRC connection setup message (RRCConnectionSetup), and an RRC connection setup complete message (RRCConnectionSetupComplete).
- the RRC message also includes a message regarding the initial activation of AS (Access Stratum) security.
- Messages relating to the initial activation of AS security include, for example, security mode command messages (SecurityModeCommand).
- the RRC message includes a message regarding reconfiguration of the RRC connection.
- messages related to RRC connection reconfiguration include an RRC reconfiguration message (RRCReconfiguration) and an RRC reconfiguration complete message (RRCReconfigurationComplete).
- messages related to RRC connection reconfiguration include an RRC connection reconfiguration message (RRCConnectionReconfiguration) and an RRC connection reconfiguration complete message (RRCConnectionReconfigurationComplete).
- Figures 6 and 7 are diagrams showing specific examples of the parameters of the RRC message.
- format E1 is the parameters of the RRC reconfiguration message.
- the RRC reconfiguration message has radioBearerConfig, radioBearerConfig2, masterCellGroup, secondaryCellGroup, masterKeyUpdate and sk-counter as parameters.
- radioBearerConfig and radioBearerConfig2 are settings related to MN-terminated bearers or SN-terminated bearers, and include SRB settings, DRB settings, security settings, and the like.
- the SRB setting includes an SRB identifier (DRB identifier), a PDCP setting, a parameter instructing PDCP re-establishment, a parameter instructing PDCP data recovery, and the like.
- the security configuration contains a parameter (keyToUse) that indicates whether to use the master key or the secondary key.
- the PDCP settings also include parameters indicating the primary path when multiple RLCs are associated (for example, in the case of split bearers), parameters for setting PDCP status report transmission, and the like.
- the masterCellGroup and secondaryCellGroup are MCG settings and SCG settings, respectively, and include cell group identifiers, RLC bearer settings, SpCell settings, and the like.
- the RLC bearer setup includes a logical channel identifier, an RLC setup, a radio bearer identifier (SRB identifier or DRB identifier) with which the RLC bearer is associated, and so on.
- SpCell configuration includes information required for reconfiguration with synchronization.
- masterKeyUpdate contains the information necessary to update the master key.
- the sk-counter contains information necessary for secondary key generation.
- Format E11 shown in FIG. 6 is a diagram showing an example of RadioBearerConfig parameters included in the RRC reconfiguration message.
- Format E12 is a diagram showing an example of CellGroupConfig parameters included in the RRC reconfiguration message.
- Format E111 shown in FIG. 7 is a diagram showing an example of parameters of SRB-ToAddMod included in RadioBearerConfig of format E11.
- Format E112 is a diagram showing an example of DRB-ToAddMod parameters included in RadioBearerConfig of format E11.
- Format E113 is a diagram showing an example of SecurityConfig parameters included in RadioBearerConfig of format E11.
- Format E121 shown in FIG. 7 is a diagram showing an example of parameters of RLC-BearerConfig included in CellGroupConfig of format E12.
- Format E122 is a diagram showing an example of parameters of SpCellConfig included in CellGroupConfig of format E12.
- the message regarding reconfiguration of RRC connection establishes, configures, changes or releases radio bearers and cell groups, reconfigures with synchronization, etc., and also establishes, configures, changes or releases measurement information.
- the RRC message includes a message regarding re-establishment of RRC connection, a message regarding release and suspension of RRC connection, a message regarding resumption of RRC connection, a message regarding terminal device capability, a message regarding terminal information, and MCG or SCG failure information. including messages about
- the eNB when the master node is eNB in MR-DC, the eNB includes the NR RRC message and parameters received from the secondary node gNB as a container in the E-UTRA RRC message and transmits it to the terminal device 100.
- the terminal device 100 may be configured for NR.
- the terminal device 100 may include a completion message for the NR setting in an E-UTRA RRC message as a container and transmit the message to the master node eNB.
- gNB when the master node is gNB in MR-DC, gNB includes the E-UTRA RRC message and parameters received from eNB, which is a secondary node, as a container in the NR RRC message and transmits it to the terminal device 100. Accordingly, the terminal device 100 may be configured for E-UTRA. Also, the terminal device 100 may include a completion message for E-UTRA configuration in an NR RRC message as a container and transmit it to the master node gNB.
- Radio Bearer An example radio bearer of a communication system is described.
- signaling radio bearer A signaling radio bearer (SRB) is a radio bearer for transmitting RRC messages and NAS messages.
- SRB0 is the radio bearer for RRC messages using the CCCH logical channel.
- SRB1 is the radio bearer for RRC and NAS messages using the DCCH logical channel before SRB2 is established as described below.
- SRB2 is the radio bearer for NAS and RRC messages containing historically logged measurement information and uses the DCCH logical channel. The priority of SRB2 is lower than that of SRB1 and may be set by base station apparatus 200 after AS security is activated.
- SRB3 is a radio bearer for RRC messages when EN-DC, NGEN-DC or NR-DC is configured in the terminal device 100, and uses the DCCH logical channel. Note that EN-DC, NGEN-DC and NR-DC are types of MR-DC and will be described in detail later.
- DRB data radio bearer
- SRB1 and SRB2 consist of one PDCP and one or more RLC bearers.
- An RLC bearer consists of RLC and MAC logical channels. It is assumed that MAC exists for each cell group described below.
- the RLC mode is AM.
- SRB3 consists of one PDCP and one RLC bearer.
- the RLC mode is AM.
- a DRB consists of one PDCP and one or more RLC bearers.
- the mode of RLC is UM or AM.
- DRB may be called UM DBR when RLC is UM, and AM DRB when RLC is AM.
- DRB is associated with one SDAP when the core network 300 is 5GC, and one EPS (Evolved Packet System) bearer (or EPS bearer identifier (EPS bearer identifier) when the core network 300 is EPC. identifier)).
- EPS Evolved Packet System
- 5GC is a core network standardized for 5G, and is described in, for example, 3GPP standards TS 23.501 and TS 23.502.
- EPC is a core network standardized for 4G, and is described in, for example, 3GPP standards TS 23.401 and TS 23.402.
- a cell group indicates the configuration of a cell in MR-DC.
- cell groups are classified into a master cell group (MCG: Master Cell Group) and a secondary cell group (SCG: Secondary Cell Group).
- FIG. 8 is a diagram showing a configuration example of a cell group of a communication system.
- the master node (MN) is the base station device 200-1
- the secondary node (SN) is the base station device 200-2.
- a master node provides a C-Plane connection to the core network 300 in MR-DC.
- the secondary node does not provide the C-Plane to the core network 300 in MR-DC and provides additional radio resources to the terminal device 100 .
- a CG is composed of one special cell (SpCell: Special Cell), or one SpCell and one or more secondary cells (SCell: Secondary Cell).
- SpCell Special Cell
- SCell Secondary Cell
- the SpCell in the MCG is called a primary cell (PCell)
- the SpCell in the SCG is sometimes called a primary SCG cell (PSCell).
- the MCG is composed of one PCell and two SCells.
- the SCG is composed of one PSCell and two SCells.
- the MCG is the CG when the MR-DC is not configured, or the CG belonging to the master node when the MR-DC is configured.
- SCG is the CG belonging to the secondary node when MR-DC is configured.
- a PCell is a cell that operates on the primary frequency in the MCG and is used for the initial connection establishment procedure or connection re-establishment procedure of the terminal device 100 .
- Connection establishment/re-establishment procedures include random access procedures.
- a PS Cell is a cell used in a random access procedure or the like when the terminal device 100 performs reconfiguration with sync in SCG.
- the SCell is a cell that provides additional radio resources in addition to the SpCell to the terminal device 100 for which carrier aggregation is set.
- MR-DC [Type of MR-DC] The types of MR-DC will be explained. MR-DC is classified into four types according to the type (corresponding generation) of the base station apparatus 200 of the master node and the secondary node and the type (corresponding generation) of the core network 300 .
- FIG. 9 is a diagram explaining the types of MR-DC. Each type of MR-DC will be described below.
- the master node is base station device 200-1
- the secondary node is base station device 200-2.
- thin solid lines indicate U-Plane connections
- dashed lines indicate C-Plane connections
- thick solid lines indicate interfaces between base stations.
- FIG. 9(a) is a diagram showing an example of EN-DC (E-UTRA-NR DC).
- the base station device 200-1 that is the master node is an E-UTRA eNB
- the base station device 200-2 that is a secondary node is an NR gNB
- the core network 300 is an EPC MR-DC. is.
- FIG. 9(b) is a diagram showing an example of NGEN-DC (NG-RAN E-UTRA-NR DC).
- NGEN-DC is an MR-DC in which a master node (base station device 200-1) is eNB, a secondary node (base station device 200-2) is gNB, and core network 300 is 5GC.
- FIG. 9(c) is a diagram showing an example of NE-DC (NR-E-UTRA DC).
- the NE-DC is an MR-DC in which the master node (base station device 200-1) is a gNB, the secondary node (base station device 200-2) is an eNB, and the core network 300 is a 5GC.
- FIG. 9(d) is a diagram showing an example of NR-DC (NR-NR DC).
- NR-DC is an MR-DC in which the master node (base station device 200-1) is a gNB, the secondary node (base station device 200-2) is another gNB, and the core network 300 is 5GC.
- EN-DC and NGEN-DC are sometimes called (NG) EN-DC.
- a secondary node of an EN-DC may be referred to as an en-gNB.
- the master node of NGEN-DC may be called ng-eNB.
- SRB1 and SRB2 are established as C-Plane interfaces between the terminal device 100 and the base station device 200-1.
- split SRB1, split SRB2, or SRB3 part of the C-Plane message may be transmitted and received between the secondary node and the terminal device 100.
- FIG. A part of the C-Plane message received by the secondary node is transmitted to the master node via the inter-base station interface.
- part of the C-Plane message transmitted from the secondary node is transmitted from the master node to the secondary node via the inter-base station interface.
- MR-DC bearer type Bearer types in MR-DC are explained.
- MN-terminated a configuration in which PDCP is terminated at the master node and PDCP is provided on the master node side
- SN-terminated a configuration in which PDCP is terminated at a secondary node and PDCP is provided on the secondary node side
- Bearer types are classified into the following six types.
- A MN-terminated MCG bearer in which the RLC bearer exists on the MCG side
- B MN-terminated Split bearer in which the RLC bearer exists in both MCG and SCG
- C MN-terminated
- D SN-terminated
- MCG bearer where the RLC bearer exists on the MCG side
- E An SN-terminated split bearer where the RLC bearer exists on both MCG and SCG
- F SCG bearer with SN-terminated and RLC bearer present on SCG side
- the DRB consists of one of the above six types of bearer types.
- SRB1 and SRB2 are composed of MN-terminated MCG bearers (above (A)) or MN-terminated Split bearers (above (B)).
- SRB1 and SRB2 may be referred to as Split SBR1 and Split SBR2, respectively, when they are composed of MN-terminated Split bearers.
- SBR3 consists of SN-Terminated SCG bearers ((F) above).
- a primary path is set.
- the primary path indicates the base station apparatus 200 to which the terminal apparatus 100 initially (preferentially) transmits data.
- the primary path is designated by cell group (MCG or SCG) and LCH.
- MCG or SCG cell group
- LCH LCH
- the terminal device 100 transmits data to the base station device 200 on the primary path unless the transmission data amount of uplink data exceeds a predetermined threshold.
- the terminal device 100 may transmit data to either base station device 200 when the amount of transmission data exceeds a predetermined threshold.
- the security key used in PDCP differs between MN-Terminated (master key) and SN-Terminated (secondary key).
- Reconfiguration with Sync is a parameter for performing reconfiguration with synchronization (reconfigurationWithSync: hereinafter referred to as "reconfiguration parameter with synchronization") in an RRC reconfiguration message that the base station apparatus 200 transmits to the terminal device 100.
- RRC reconfiguration message that the base station apparatus 200 transmits to the terminal device 100.
- FIG. 10 is a diagram explaining resetting with synchronization.
- the terminal device (UE) 100 changes the connected PCell from the current source PCell to the target PCell (step S1).
- Synchronous reconfiguration parameters are parameters for MCG configuration (hereinafter sometimes referred to as "MCG configuration parameters") or parameters for SCG configuration (hereinafter sometimes referred to as "SCG configuration parameters"). included. That is, if the reset parameter with synchronization is included in the MCG configuration parameters, the reset with synchronization of the MCG is performed, and if the reset parameter with synchronization is included in the SCG configuration parameters, the reset with synchronization of the SCG is executed.
- Reconfiguration with synchronization is a procedure in which the terminal device 100 changes the PCell or PSCell, random access to the new (change destination, target) PCell or PSCell, MAC reset and PDCP data recovery (in the case of AM DRB) including actions such as Reconfiguration with synchronization may also involve changing security keys.
- PDCP entity re-establishment is performed in addition to the above operations.
- PDCP entity re-establishment may be referred to as PDCP re-establishment.
- a QoS flow is a Service Data Flow (SDF) with the same QoS requirements and is identified by a QoS Flow Identifier (QFI).
- the SDF is, for example, an IP flow or an Ethernet flow, and differs depending on upper layers.
- FIG. 11 is a diagram explaining transmission of the end marker control PDU.
- the DRB associated with QoS flow 1 is changed from DRB1 to DRB2 (step S2).
- the terminal device 100 transmits the data of the QoS flow 1 that remains before the change is instructed, using DRB1 before the change.
- the terminal device 100 transmits, via DRB1, an end marker control PDU indicating that data of QoS flow 1 is to be transmitted last via DRB1.
- the association between the QoS flow and the DRB may be performed by parameters included in the RRC reconfiguration message or may be performed by header information included in the downlink SDAP data PDU. The latter is called reflective mapping.
- RRC state (mode) The RRC state of the terminal device 100 indicates the state regarding the RRC connection of the terminal device 100 .
- a state in which an RRC connection with the base station apparatus 200 is not established may be called an RRC idle mode (RRC_IDLE).
- a state in which an RRC connection is established with the base station apparatus 200 may be called an RRC connected mode (RRC_CONNECTED).
- RRC_CONNECTED A state in which the RRC connection with the base station apparatus 200 is temporarily stopped (suspended) may be called an RRC inactive mode (RRC_INACTIVE).
- RRC_INACTIVE RRC inactive mode
- a transition from the RRC idle mode to the RRC connected mode may be performed by transmitting/receiving a message regarding establishment of an RRC connection between the terminal device 100 and the base station device 200 .
- the terminal device 100 sends an RRC setup request message to the base station device 200 and receives an RRC setup message from the base station device 200 as a response, whereby the terminal device 100 may transition to the RRC connection mode.
- the RRC SETUP REQUEST message and the RRC SETUP message may be transmitted and received using the CCCH logical channel.
- the cell used for transmitting and receiving the RRC setup request message and the RRC setup message may be the PCell.
- the terminal device 100 that has transitioned to the RRC connection mode further receives a message regarding the initial activation of AS security and a message regarding re-establishment of the RRC connection from the base station device 200, and by performing settings according to the message, user data (for example, IP packets, Ethernet frames, etc.) can be transmitted and received.
- user data For example, IP packets, Ethernet frames, etc.
- carrier aggregation and MR-DC may be configured by a message regarding re-establishment of RRC connection. It should be noted that messages regarding initial activation of AS security and messages regarding re-establishment of RRC connection may be transmitted and received using the DCCH logical channel.
- a transition from the RRC connected mode to the RRC inactive mode may be performed by the terminal device 100 transmitting/receiving from the base station device 200 a message regarding release of the RRC connection, which includes parameters regarding the suspend setting of the RRC connection.
- FIG. 15A shows a transition procedure (procedure) from RRC connected mode to RRC inactive mode when base station device 200 is gNB (master node is gNB in case of MR-DC) and core network 300 is 5GC.
- FIG. 10 shows.
- the base station apparatus 200 sends to the terminal apparatus 100 a message (RRCRelease) regarding release of the RRC connection including a parameter (suspendConfig) regarding the suspend setting of the RRC connection.
- the terminal device 100 transitions to the RRC inactive mode by performing processing according to the received RRC release message. Note that the RRC Release message can be sent using the DCCH logical channel.
- the terminal device 100 may perform processing including saving the UE inactive AS context and suspending radio bearers other than SRB0.
- the UE inactive AS context includes the current (immediately before transition to RRC inactive mode) security key of the terminal device 100, the state related to header compression, the correspondence between the QoS flow and the DRB, the C in the source (handover source) PCell. - Settings including RNTI (Cell Radio Network Temporary Identifier), etc.
- MR-DC is configured in the terminal device 100
- the configuration regarding SCG may be saved as the UE inactive AS context. Note that some of the parameters related to handover such as reconfiguration with synchronization, some of the parameters set in the SIB, and the like may be excluded from the settings saved as the UE inactive AS context.
- a transition from the RRC inactive mode to the RRC connected mode may be performed by transmitting/receiving a message regarding RRC connection resumption between the terminal device 100 and the base station device 200 .
- FIG. 15(b) shows a transition procedure (procedure) from RRC inactive mode to RRC connected mode when base station device 200 is gNB (master node is gNB in case of MR-DC) and core network 300 is 5GC. It is a diagram.
- the terminal device 100 sends an RRC resume request message (RRCResumeRequest) to the base station device 200, receives an RRC resume message (RRCResume) from the base station device 200 in response, and performs processing according to the received RRC resume message.
- RRCResumeRequest RRC resume request message
- RRCResume RRC resume message
- the terminal device 100 may transition to the RRC connected mode.
- the base station device 200 includes the SCG setting in the RRC restart message, and the SCG Configuration may include reconfiguration with synchronization of the SCG.
- the RRC restart request message is transmitted using, for example, the CCCH logical channel.
- the RRC Resume message is transmitted using, for example, the DCCH logical channel.
- SCG failure information When the terminal device 100 detects an SCG failure when MR-DC is configured, the terminal device 100 may send a message (SCGFailureInformation) regarding SCG failure information to the master node via the MCG.
- SCG failure is, for example, when physical layer synchronization is lost on the SCG side, when random access failure occurs on the SCG side, when the number of RLC retransmissions on the SCG side exceeds a predetermined threshold, and when reconfiguration with synchronization of the SCG fails. It may be detected when the SCG settings cannot be processed, when the integrity verification of the SRB3 fails, and so on.
- the terminal device 100 may perform operations including suspending SCG transmissions for all radio bearers, i.e. suspending transmission of all radio bearers associated with the SCG.
- SCGFailureInformationNR may be sent instead of SCGFailureInformation.
- SCGFailureInformation and SCGFailureInformationNR are transmitted using, for example, the DCCH logical channel.
- the base station apparatus 200 that has received the message regarding the SCG failure information from the terminal device 100 may transmit a message regarding reconfiguration of the RRC connection to the terminal device 100 in order to reconfigure the SCG.
- SCG inactive In EN-DC or NR-DC, the communication between the secondary node and the terminal device 100 may be restricted by deactivating the SCG set in the terminal device 100 .
- SCG deactivation the state in which the SCG is in an inactive state
- SCG being in an active state also referred to as “activation state” or “activation state”
- SCG deactivation the SCG being in an active state
- SCG deactivation activating an inactive SCG
- activating an inactive SCG may be referred to as SCG (re)activation.
- “reactivation” and “reactivate” shall include “activation” and "activate” respectively.
- the terminal device 100 during SCG deactivation shall satisfy some or all of the following conditions. - When a message (for example, an RRC reconfiguration message) related to reconfiguration of the SCG RRC connection is received from the base station apparatus 200, the processing according to this message is executed. - Uplink transmission on the SCG side is not performed. Processing for uplink data may be performed - PDCCH monitoring (reception) is not performed in PSCell - PUSCH transmission on the SCG side is not performed
- the terminal device 100 includes a parameter indicating SCG deactivation in the message regarding reconfiguration of the RRC connection received from the base station device 200 and includes a parameter regarding reconfiguration with synchronization of SCG does not perform random access processing at least in the SCG.
- terminal device 100 during SCG deactivation may communicate with the base station device 200 in the RRC connection mode using MCG.
- Embodiment 1 will be described.
- the communication system switches from SCG deactivation to SCG (re)activation, or from SCG (re)activation to SCG deactivation.
- Appropriate control means, for example, to control unnecessary switching so as not to perform unnecessary switching, or to postpone switching timing until necessary timing, in order to achieve power saving.
- the communication system controls unnecessary uplink transmission during SCG deactivation to save power.
- FIG. 12 is a sequence diagram showing a transition operation to SCG deactivation.
- Base station apparatus 200 is, for example, a master node in MR-DC.
- MR-DC in FIG. 12 includes, for example, (NG)EN-DC and NR-DC.
- NG NGEN-DC
- NR-DC NR-DC
- the message transmitted/received by the base station apparatus 200 may be transmitted/received by either the master node or the secondary node.
- the message transmitted from the terminal device 100 to the secondary node shall be transmitted to the master node via inter-base station communication.
- the processing executed by the base station apparatus 200 may be executed by either the master node or the secondary node.
- the terminal device 100 does not transmit a message to the secondary node and does not receive PDCCH from the secondary node during SCG deactivation.
- the terminal device 100 sets the SCG (step S101) and is in SCG (re)activation.
- the SCG setting is performed by the terminal device 100 receiving an RRC reconfiguration message including SCG setting parameters from the base station device 200 .
- the SGC setting parameters include, for example, NR SGC setting parameters.
- the terminal device 100 transmits a terminal information notification to the base station device 200 (step S102).
- the terminal information notification is, for example, an RRC message or a parameter included in the RRC message.
- the terminal information notification may be, for example, UE assistance information in an RRC message, or may be a message with another name.
- the terminal information notification includes, for example, information indicating whether power saving is required in the terminal device 100 .
- the terminal device 100 determines whether power saving is necessary, for example, according to the remaining battery level.
- the terminal information notification includes, for example, information indicating whether SCG deactivation (or SCG release) is necessary.
- the terminal device 100 determines the necessity of SCG deactivation, for example, according to the amount of communication (data communication amount) with the secondary node.
- information indicating whether to immediately perform may contain
- the terminal information notification is, for example, when UL data occurs, without permission of the base station device 200 (without transmitting an SCG reactivation request in step S110 described later), SCG (re)activation It may also contain information indicating that it will be executed. This makes it possible to omit part of message transmission/reception between the base station apparatus 200 and the terminal apparatus 100 in SCG (re)activation.
- the base station apparatus 200 Upon receiving the terminal information notification, the base station apparatus 200 performs SCG deactivation determination processing (step S103). Note that the base station apparatus 200 performs SCG deactivation determination processing when an event requiring (or possibly requiring) SCG deactivation occurs in addition to when the terminal information notification is received. Execute.
- the SCG deactivation determination process is a process of determining whether or not to perform SCG deactivation on the terminal device 100.
- the base station device 200 determines whether or not SCG deactivation is to be performed using, for example, the amount of communication between the terminal device 100 and the secondary node.
- the base station apparatus 200 operates as a secondary node when, for example, the amount of communication between the terminal apparatus 100 and the secondary node is less than or equal to a predetermined value during a predetermined period of time, or when communication between the terminal apparatus 100 and the secondary node does not occur for a predetermined period of time.
- the amount of communication using is small, it is determined to perform SCG deactivation.
- the base station device 200 determines whether or not there is SCG deactivation using, for example, the allocatable radio resource amount of the secondary node.
- the base station device 200 determines to perform SCG deactivation, for example, when the amount of available radio resources in the secondary node is equal to or less than a predetermined value.
- the base station device 200 When the base station device 200 determines to perform SCG deactivation in the SCG deactivation determination process, it transmits an SCG deactivation instruction to the terminal device 100 (step S104).
- the SCG deactivation indication may be, for example, an RRC message or a parameter included in the RRC message.
- the SCG deactivation instruction may be a parameter included in the RRC reconfiguration message, may be a parameter included in the RRC resume message, or may be a parameter included in the RRC connection reconfiguration message. However, it may be a parameter included in a message with another name.
- the SCG deactivation instruction may be a parameter that instructs the terminal device 100 to perform SCG deactivation.
- the SCG deactivation instruction may be a parameter indicating that the SCG of the terminal device 100 is in a deactivated state.
- the SCG deactivation indication may be a parameter such as scg-state.
- the SCG deactivation instruction immediately executes part or all of the SCG reconfiguration with synchronization. Includes information on whether or not When the information to the effect that all processing is to be executed immediately is included, the terminal device 100 immediately executes reconfiguration with synchronization of the SCG. Also, if information is included to the effect that some or all of them will not be immediately executed, the terminal device 100, when executing the SCG (re)activation later, performs the unexecuted reset processing with synchronization of the SCG. Execute (suspend reset with synchronization), or do not execute some or all of the reset with synchronization of SCG (discard some or all of instructions (parameters) for reset with synchronization) ).
- the SCG deactivation instruction is, for example, when the terminal device 100 is instructed to perform reconfiguration with synchronization of SCG during SCG deactivation, if at least the first condition is not met, synchronization of SCG immediately Information to the effect of instructing to execute part or all of the tag resetting process may be included. In this case, if the terminal device 100 does not meet at least the first condition, the terminal device 100 immediately performs reconfiguration with synchronization of the SCG. Further, in this case, when at least the first condition is met, the terminal device 100 executes the unexecuted one of the SCG resetting processes with synchronization when executing the SCG (re)activation later. (suspend reset with synchronization), or do not execute some or all of the reset with synchronization processing of SCG (discard some or all of instructions (parameters) for reset with synchronization) ).
- the first condition is, for example, to satisfy some or all of the following (Conditions 1-1) to (Conditions 1-4).
- SCG reconfiguration with synchronization is accompanied by a change in the master node's security key (KgNB or KeNB) or a change in the AS security key generated from the master node's security key.
- KgNB or KeNB master node's security key
- a radio bearer that uses a master key may be a radio bearer whose parameter (keyToUse) indicating whether to use the master key or the secondary key is set to master (or primary).
- a radio bearer using a secondary key may be a radio bearer whose parameter (keyToUse) indicating whether to use the master key or the secondary key is set to secondary.
- the terminal device 100 does not immediately execute part or all of the reconfiguration processing with synchronization of the SCG, communication in MR-DC (especially using the master node communication). Thereby, since the terminal device 100 does not perform unnecessary SCG (re)activation, power consumption can be suppressed.
- the SCG deactivation instruction is information to the effect that, for example, when the terminal device 100 is instructed to perform SCG reconfiguration with synchronization during SCG deactivation, it immediately performs SCG reconfiguration with synchronization.
- the SCG deactivation instruction may include information to the effect that, for example, when UL data is generated, SCG (re)activation is instructed without the permission of the base station device 200. In this case, the terminal device 100 immediately executes SCG (re)activation.
- the terminal device 100 Upon receiving the SCG deactivation instruction, the terminal device 100 performs SCG deactivation processing (step S105).
- the SCG deactivation process is a process of transitioning to SCG deactivation. Note that the terminal device 100 may determine that it is necessary to perform the SCG deactivation process by receiving the SCG deactivation instruction, and perform the SCG deactivation process. Moreover, the terminal device 100 may determine that there is no need to perform the SCG deactivation process by not receiving the SCG deactivation instruction, and may not perform the SCG deactivation process.
- the SCG deactivation process may include some or all of the following (1) to (3) processes.
- (1) Consider that the SCG is deactivated (2) Notify the lower layer that the SCG has been deactivated (3)
- RRC If in connected mode or RRC inactive mode, trigger SDU discard to PDCP entity in SRB3 and/or re-establish RLC entity in SRB3
- the lower layer may be the MAC layer, the RLC layer, or the PDCP layer. Further, the processing of (3) above may be performed when SRB3 is set in the terminal device 100 and SRB3 is not released by an RRC message including an SCG deactivation instruction.
- the terminal device 100 may continue the SCG deactivation state.
- the terminal device 100 receives an RRC reconfiguration message that does not include an SCG deactivation instruction during SCG deactivation, an RRC connection reconfiguration message that does not include an SCG deactivation instruction, or an RRC that does not include an SCG deactivation instruction.
- the resume message it may be determined that the SCG (re)activation process should be performed, and the SCG (re)activation process may be performed.
- the SCG (re)activation process may include some or all of the following processes (4) to (5). (4) SCG is considered to be (re)activated (5) If the terminal device 100 is in SCG deactivation, notify the lower layer that the SCG has been (re)activated
- the lower layer may be the MAC layer, the RLC layer, or the PDCP layer.
- the terminal device 100 stops some or all of the timers running for SCG. Also, the terminal device 100 resets some or all of the counters set in the SCG. Also, the terminal device 100 resets the SCG MAC. Furthermore, the terminal device 100 performs the second process on radio bearers that satisfy at least the second condition.
- the second condition is that it is an SCG bearer, that it is a split bearer, or that it is a split bearer and the primary path is set to the SCG.
- the radio bearers that satisfy the second condition may be, for example, some or all of the radio bearers set in the terminal device 100 .
- timers activated for the SCG to be stopped may include a timer for detecting radio link failure (RLF) of the SCG.
- timers activated for the SCG to be stopped may include a timer for the measurement report of the SCG.
- the counters set in the SCG to be reset may include a counter for detecting Radio Link Failure (RLF) of the SCG.
- to perform the second processing for radio bearers that satisfy at least the second condition means that the terminal device 100 determines whether or not at least the second condition is satisfied for each radio bearer, and performs at least the second condition. , the second process may be performed on this radio bearer.
- to perform the second processing for radio bearers that satisfy at least the second condition means that the terminal device 100 determines whether or not at least the second condition is satisfied for each radio bearer, and performs at least the second condition. If it is determined that the above conditions are satisfied and it is further determined that it is necessary to perform the second processing on this radio bearer, the second processing may be performed on this radio bearer.
- the second condition "being an SCG bearer” means that one or both of a parameter (moreThanOneRLC) meaning one or more RLCs and a parameter (primaryPath) meaning a primary path are set in the radio bearer (PDCP). and that the RLC bearer of the radio bearer is in the SCG. Also, the second condition "being an SCG bearer” may be that the RLC bearer of the radio bearer exists only in the SCG. This "radio bearer's RLC bearer" may be the RLC bearer associated with the radio bearer.
- the second condition, ⁇ split bearer and the primary path is set in the SCG'' is that the primary path (or the parameter meaning the primary path) of the radio bearer (PDCP) is set in the SCG. (or refer to SCG).
- the second process is a process performed on some or all radio bearers that satisfy at least the second condition.
- the second process is part or all of the process when transitioning to SCG deactivation and the pre-process.
- the second processing includes, for example, some or all of the following processing.
- some or all of the radio bearers that satisfy at least the second condition may be referred to as second radio bearers.
- the reordering timer is activated in the PDCP of the second radio bearer If so, stop and send all stored PDCP SDUs to upper layers in order after header decompression. Re-establish RLC on second radio bearer.
- the second process may be performed according to the following procedure, or may include the following procedure.
- a PDCP SDU that has been given a sequence number but has not been handed over to the lower layer is treated as a PDCP SDU that has just been received from the upper layer. and transmit in order. Also, at this time, the discard timer does not have to be restarted.
- PDCP SDUs for which successful transmission has not been confirmed from the lower layer and/or transmit in order PDCP SDUs that have been assigned sequence numbers but have not been delivered to lower layers.
- the discard timer does not have to be restarted.
- the discard timer may be a timer that is used to discard the corresponding PDCP SDU when it expires.
- the RRC of the terminal device 100 makes a second notification to the PDCP of some or all radio bearers that are SCG bearers or split bearers.
- PDCP may be replaced by lower layer(s).
- PDCP that has received the second notification is an SCG bearer (if there is one associated RLC) or a split bearer (two or more associated RLCs), and the primary path is set on the SCG side If so, the second process is performed.
- the RRC of the terminal device 100 makes a second notification to the PDCP of the second radio bearer.
- PDCP may be replaced by lower layer(s).
- the PDCP that has received the second notification performs a second process.
- Some radio bearers that meet at least the second condition may be, for example, SRBs that meet at least the second condition, or DRBs that meet at least the second condition.
- the second notification is, for example, a notification instructing the discarding of PDCP data.
- the second notification may be a notification instructing to immediately transmit data that has not been completely transmitted.
- the second notification may include information indicating that the SCG is deactivated, such as SCG deactivated or CG UL transmission prohibited (suspended).
- the second notification may contain some or all of these pieces of information.
- the second notification may be multiple messages containing some of these pieces of information.
- the terminal device 100 can suppress unnecessary SCG (re)activation and power consumption.
- the RRC of the terminal device 100 transmits the second information to the SDAP associated with the DRB among the second radio bearers.
- the second information indicates that uplink transmission is not possible on the DRB, such as that UL transmission of the DRB is prohibited (or stopped) or that the cell group to which the DRB is associated is being deactivated. This is the information shown.
- the second information may be sent to the SDAP together with some or all of the following information. Also, the second information may be part or all of the following information. ⁇ DRB identifier of the relevant DRB - the QoS flow identifier associated with that DRB
- transmitting the second information to the SDAP associated with the DRB among the second radio bearers means that the terminal device 100 determines whether or not at least the second condition is satisfied for each DRB, and determines whether or not at least the second condition is satisfied. If it is determined that the condition is met, the DRB may transmit the second information to the associated SDAP.
- transmitting the second information to the SDAP associated with the DRB among the second radio bearers means that the terminal device 100 determines whether or not at least the second condition is satisfied for each DRB, and determines whether or not at least the second condition is satisfied. If it is determined that the condition is satisfied and it is necessary to transmit the second information to the SDAP associated with this DRB, the second information is transmitted to the SDAP associated with this DRB. It can be.
- the second information transmission process may be executed when at least the DRB that satisfies the second condition is associated with SDAP (if SDAP entity associated with this DRB is configured).
- the terminal device 100 may determine whether or not each DRB is related to SDAP, and if it is determined to be related to SDAP, may determine whether or not this DRB satisfies at least the second condition. .
- the terminal device 100 determines whether or not at least the second condition is satisfied for each DRB, and when determining that at least the second condition is satisfied, the terminal device 100 determines whether or not this DRB is related to SDAP. can be
- FIG. 13 is a sequence diagram showing the RRC message transmission/reception operation of the terminal device 100 during SCG deactivation.
- the base station device 200 transmits an RRC reconfiguration message (first message) to the terminal device 100 during SCG deactivation (step S106).
- transmitting an RRC reconfiguration message to the terminal device 100 during SCG deactivation means that the RRC reconfiguration message including a parameter (SCG deactivation instruction) instructing the SCG to be in a deactivation state to the terminal device 100 .
- the state of the SCG of the terminal device 100 may be activated or deactivated.
- the RRC reconfiguration message is an RRC message related to RRC connection reconfiguration sent from the base station apparatus 200 to the terminal device 100, and includes establishment, configuration, change and release of radio bearers, cell groups, measurement information and the like, and synchronization. Reconfigure the attachment, etc.
- the RRC reconfiguration message may be, for example, the RRC message RRCReconfiguration, or may be a message with another name.
- the base station apparatus 200 determines that it is necessary to change the settings of the terminal apparatus 100 (change the settings in the RRC connection mode), it generates an RRC reconfiguration message and transmits it to the terminal apparatus 100 .
- the base station apparatus 200 determines that it is necessary to change the settings of the terminal apparatus 100 when MGC handover becomes necessary, for example. Also, for example, when the security key needs to be changed, the base station apparatus 200 determines that the setting of the terminal apparatus 100 needs to be changed. The base station device 200 needs to change the setting of the terminal device 100 when it is necessary to re-establish PDCP (using a key generated from the security key) related to the security key that needs to be changed. judge that it has happened. Also, the base station apparatus 200 needs to change the setting of the terminal apparatus 100, for example, when it is necessary to change the QoS flow to DRB mapping rule (rule indicating the correspondence (map) between the QoS flow and the DRB). I judge.
- DRB mapping rule rule indicating the correspondence (map) between the QoS flow and the DRB
- the RRC reconfiguration message includes, for example, the following information. ⁇ Information instructing to perform reconfiguration with synchronization of SCG ⁇ When information instructing to perform reconfiguration with synchronization of SCG is included, if at least the first condition is not met, immediately perform reconfiguration with synchronization of SCG.
- the first condition is the first condition used in step S103. That is, the first condition is, for example, to satisfy some or all of the above (conditions 1-1) to (conditions 1-4).
- the parameter meaning the SCG configuration (for example, the name secondaryCellGroup) is added to the RRC reconfiguration message. May not include reconfiguration parameters with synchronization (may not require reconfiguration with synchronization of SCG).
- the base station device 200 when the terminal device 100 is in SCG deactivation, the base station device 200 optionally includes a reconfiguration parameter with SCG synchronization in the RRC reconfiguration message to the terminal device 100 (not essential). You can judge. For example, the base station device 200 needs to update the security key of the secondary node, but the terminal device 100 is in SCG deactivation and there is no MN terminated RLC bearer (related to the master key) on the SCG side If so, do not include the reconfiguration with synchronization parameters of the SCG in the RRC reconfiguration message.
- the base station device 200 when the base station device 200 satisfies at least the third condition and the terminal device 100 is not in SCG deactivation, it is essential to include a reconfiguration parameter with SCG synchronization in the RRC reconfiguration message to the terminal device 100. , and the reconfiguration parameter with synchronization of SCG may be included without fail. Further, even when at least the third condition is satisfied, the base station apparatus 200, when the terminal apparatus 100 is in SCG deactivation, reconfigures with SCG synchronization in the RRC reconfiguration message to the terminal apparatus 100. It may be determined that the inclusion of configuration parameters is optional (not mandatory) and the reconfiguration parameters with synchronization of the SCG may not be included.
- the third condition may be, for example, that the AS security key generated from the secondary node security key (S-KgNB or S-KeNB) in NR-DC is changed, or that the secondary key is used1
- the radio bearer described above may be set in the terminal device 100, and may not be released even if the radio bearer performs the process associated with the reception of the RRC reconfiguration request.
- the third condition may be, for example, that the base station apparatus 200 executes MN handover in (NG) EN-DC. Also, the third condition may be, for example, that the base station apparatus 200 performs SCG (re)activation.
- the base station apparatus 200 includes a change of the AS security key generated from the security key (KgNB or KeNB) of the master node in the RRC reconfiguration message to the terminal device 100, and includes the reconfiguration parameter with synchronization of the SCG. Otherwise, if the terminal device 100 is not in SCG deactivation, it may be determined to release all existing SCG RLC bearers associated with radio bearers using the master key.
- KgNB or KeNB security key
- the base station apparatus 200 includes a change of the AS security key generated from the security key (KgNB or KeNB) of the master node in the RRC reconfiguration message to the terminal device 100, and includes the reconfiguration parameter with synchronization of the SCG. If not included, if the terminal device 100 is in SCG deactivation, it may be determined that all existing SCG RLC bearers associated with radio bearers that use the master key need not be released.
- the base station apparatus 200 may include in the RRC reconfiguration message a parameter for instructing to perform SCG reconfiguration with synchronization and a parameter for instructing to perform SCG deactivation.
- a radio bearer that uses a master key may be a radio bearer whose parameter (keyToUse) indicating whether to use the master key or the secondary key is set to master (or primary).
- a radio bearer using a secondary key may be a radio bearer whose parameter (keyToUse) indicating whether to use the master key or the secondary key is set to secondary.
- the terminal device 100 Upon receiving the RRC reconfiguration message, the terminal device 100 performs RRC message reception processing during SCG deactivation (step S107). The terminal device 100 performs processing according to information (parameters) included in the RRC reconfiguration message in the RRC message reception processing during SCG deactivation.
- the RRC reconfiguration message includes, for example, the following parameters. ⁇ Synchronous reset parameter (indicates that resetting with synchronization is to be executed) ⁇ Parameter for instructing PDCP re-establishment (indicating that execution of PDCP re-establishment is instructed) ⁇ Parameters that indicate the setting of the QoS flow to DRB mapping rule (indicate that the execution of resetting of the QoS flow to DRB mapping rule is instructed)
- the terminal device 100 satisfies a predetermined condition, and if the SCG side radio bearer is suspended, uplink communication of the suspended SCG side radio bearer is performed. resume.
- the predetermined condition is, for example, not during SCG deactivation. It should be noted that "when a predetermined condition is satisfied" may be rephrased as "when it is determined whether or not a predetermined condition is satisfied, and when it is determined that the predetermined condition is satisfied”.
- the predetermined condition may be, for example, any one of (Condition 2-1) to (Condition 2-3) below.
- the terminal device 100 when the terminal device 100 is in SCG deactivation, the SCG side radio bearer is not in a suspended state but in another state (for example, SCG is deactivated or uplink transmission is prohibited).
- the terminal device 100 may resume uplink communication of the suspended SCG side radio bearer regardless of whether SCG deactivation is in progress.
- the terminal device 100 may perform the following processing. - The terminal device 100 may immediately execute the reconfiguration process with synchronization of the SCG
- the terminal device 100 does not immediately execute a part or all of the processing of resetting with synchronization of the SCG, and the processing that is not executed immediately may be executed at the time of SCG (re)activation.
- the processing to be executed immediately includes, for example, MAC reset on the SCG side, applying the identifier of the new terminal device 100 as the C-RNTI of the cell group, and the like.
- the processing to be executed during SCG (re)activation is, for example, random access processing on the SCG side (which may include processing for setting the lower layer according to the received parameter (SpCellConfigCommon) meaning the common SpCell configuration), For example, starting a timer to detect reconfiguration failure with synchronization.
- the terminal device 100 determines whether or not to immediately perform the SCG reconfiguration process with synchronization, the SCG deactivation instruction in step S104, or the parameter (SCG reconfiguration with synchronization) included in the RRC reconfiguration message in step S106. parameter) indicating whether to immediately execute the setting. For example, if the terminal device 100 does not meet at least the first condition, it immediately executes the processing of resetting with synchronization of SCG, and if applicable, the processing of resetting with synchronization of SCG is SCG (re)activation. may be executed when Furthermore, the terminal device 100 may return to SCG deactivation again after executing the above-described processing.
- the first condition is the first condition used in step S103. That is, the first condition is, for example, to satisfy some or all of the above (conditions 1-1) to (conditions 1-4).
- the terminal device 100 If it contains a parameter that indicates PDCP re-establishment- When the received RRC reconfiguration message includes a parameter instructing PDCP re-establishment, the terminal device 100 immediately re-establishes PDCP, for example. In this case, if there is data that has not been completely transmitted in the PDCP of some or all of the radio bearers that satisfy at least the second condition, the terminal device 100 transmits the data after the SCG is (re)activated. You can send it.
- the terminal device 100 may perform PDCP re-establishment of some or all radio bearers that satisfy at least the second condition after the SCG is (re)activated.
- PDCP which performs PDCP re-establishment after SCG (re)activation, does not perform processing corresponding to the PDCP SDU even if it receives the PDCP SDU from the upper layer.
- the second condition may be the second condition used in step S105, that is, the SCG bearer, or the split bearer and the primary path is set to the SCG.
- the terminal device 100 receives a PDCP SDU that has been assigned a sequence number but has not been delivered to the lower layer from the upper layer. Regard it as the PDCP SDU just received and send it in order. At this time, it is not necessary to restart the discard timer.
- the terminal device 100 does not confirm successful transmission from the lower layer, for example, in the case of AM DRB or in the case of AM DRB in which the PDCP entity is not suspended.
- PDCP SDUs, and PDCP SDUs that have sequence numbers assigned but have not been handed over to lower layers, are sent in order.
- the terminal device 100 for example, in the case of AM DRB for the Uu interface where the PDCP entity is suspended, PDCP SDUs for which successful transmission has not been confirmed from the lower layer , and PDCP SDUs that have been assigned sequence numbers but have not been delivered to the lower layer are regarded as PDCP SDUs that have just been received from the upper layer, and are transmitted in order. At this time, it is not necessary to restart the discard timer.
- the discard timer may be a timer that is used to discard the applicable PDCP SDU when it expires.
- the base station apparatus 200 immediately performs PDCP re-establishment processing for some or all radio bearers that satisfy at least the second condition in the RRC reconfiguration message in step S106 (or after the SCG is (re)activated may include a parameter indicating what to do).
- the terminal device 100 determines from the parameter whether to immediately perform re-establishment processing for PDCP for some or all radio bearers that satisfy at least the second condition, or to perform after the SCG is (re)activated. good.
- terminal device 100 performs the following processing.
- the QoS flow to DRB mapping rule indicates, for example, the correspondence relationship between QoS flows and DRBs.
- the terminal device 100 performs end marker processing when a predetermined condition is satisfied.
- End marker processing is processing to build an end marker control PDU, map it to the DRB before change, and send it to the lower layer. It should be noted that "when a predetermined condition is satisfied” may be rephrased as "when it is determined whether or not a predetermined condition is satisfied, and when it is determined that the predetermined condition is satisfied.”
- mappedQoS-FlowToAdd included in the received RRC reconfiguration message is assumed to be a parameter for the first QoS flow.
- the DRB ( That is, when the already stored DRB corresponding to the first QoS flow is a DRB that does not correspond to the second information received from the RRC of the terminal device 100 in step S105, end marker processing is performed.
- step S105 the second information is notified to the SDAP associated with at least the data radio bearer that satisfies the second condition.
- QoS flow to DRB mapping rule stored for the first QoS flow is set (by mapped QoS-FlowToAdd included in the received RRC reconfiguration message) Be different from the rule.
- the DRB mapped by the newly received QoS flow to DRB mapping rule is the DRB mapped by the stored (already received) QoS flow to DRB mapping rule. that has been changed from
- the QoS flow to DRB mapping rule for the first QoS flow does not exist (is not stored), and the default DRB is set, Some or all of the following processing may be performed.
- Step S105 If the default DRB is a DRB that does not correspond to the second information received from the RRC of the terminal device 100 in step S105, construct an end marker control PDU, map it to the default DRB, and transmit it to the lower layer.
- the QoS flow to DRB mapping rule may be the QoS flow to DRB mapping rule for the uplink (UL QoS flow to DRB mapping rule).
- step S105 when the RRC of the terminal device 100 has sent the second notification to the PDCP (when the terminal device 100 recognizes that the PDCP is the PDCP of the radio bearer that satisfies at least the second condition). ), create an end marker control PDU (SDAP Control PDU) and send it to PDCP.
- SDAP Control PDU end marker control PDU
- the PDCP of the terminal device 100 receives the SDAP Control PDU, it discards the received SDAP Control PDU.
- the PDCP of the terminal device 100 may discard the SDAP Control PDU when it is a split bearer and the primary path is on the SCG.
- the terminal device 100 may not transmit the end marker control PDU to the SCG during SCG deactivation by implementing the base station device 200 .
- the base station apparatus 200 does not include mappedQoS-FlowToAdd in the RRC reconfiguration message that the terminal apparatus 100 transmits to the terminal apparatus 100 during SCG deactivation.
- the terminal device 100 sends the end marker control PDU to the SCG side. Set not to send.
- the terminal device 100 determines that it cannot perform processing according to the RRC reconfiguration message received from the base station device 200, the terminal device 100 notifies the base station device 200 of the RRC connection re-establishment procedure or the SCG radio Procedures for link failure (RLF) may be triggered.
- the terminal device 100 receives the RRC reconfiguration message from the base station device 200, even though the reconfiguration parameter with synchronization is essential, but does not include the reconfiguration parameter with synchronization. It is determined that it cannot be processed according to Further, for example, the terminal device 100, despite being in SCG deactivation, when the RRC reset message received from the base station device 200 causes the end marker transmission to the SCG, according to the received RRC reset message. It is determined that it cannot be processed.
- FIG. 14 is a sequence diagram showing SCG reactivation operations during SCG deactivation.
- UL data may arrive while the terminal device 100 is in SCG deactivation (step S108).
- the arrival of UL data indicates that data to be transmitted to the base station apparatus 200 has occurred, for example, PDCP SDU may be that PDCP arrives (sent), MAC SDU to MAC on the SCG side It may be arriving (transmitting).
- the terminal device 100 When the UL data arrives, the terminal device 100 performs UL data transmission processing during SCG deactivation (step S109).
- the UL data transmission process during SCG deactivation is a process of determining whether or not to immediately transmit the UL data to the master node or the secondary node, and transmitting the UL data at an appropriate timing.
- the UL data transmission processing during SCG deactivation will be described separately for the case where the PDCP SDU arrives at the PDCP and the case where the MAC SDU arrives at the MAC on the SCG side.
- a PDCP SDU arrives at PDCP-
- the terminal that detects that the PDCP SDU has arrived The PDCP of the device 100 notifies the RRC of the terminal device 100 that UL data has occurred.
- the terminal device 100 may notify the RRC of the terminal device 100 when receiving the PDCP SDU from the upper layer.
- the terminal device 100 may notify the RRC of the terminal device 100 when the transmission data amount exceeds or is likely to exceed a predetermined threshold. .
- the RRC of the terminal device 100 Upon receiving notification from the PDCP of the terminal device 100 that UL data has been generated, the RRC of the terminal device 100 transmits an SCG reactivation request to the base station device 200 (step S110).
- the SCG reactivation request may be a message requesting SCG (re)activation or a message containing parameters requesting SCG (re)activation.
- the SCG reactivation request is, for example, an RRC message.
- the SCG reactivation request may be, for example, an RRC message SCG reactivation request, or may be a message with another name.
- a MAC SDU arrives at the MAC on the SCG side-
- the RRC processing of the terminal device 100 is the same as when the above-described PDCP SDU arrives at PDCP.
- the MAC of the terminal device 100 Upon detecting the arrival of the MAC SDU, the MAC of the terminal device 100 notifies the RRC of the terminal device 100 that UL data has been generated. Also, the MAC of the terminal device 100 may perform SCG (re)activation and prepare for transmitting UL data (for example, execution of a random access procedure for a secondary node, etc.). If there is an SCG reset with synchronization that was not immediately executed in step S107 or the like, the terminal device 100 may perform the SCG reset with synchronization in advance. Also, the MAC of the terminal device 100 may perform all processing related to SCG (re)activation after receiving the SCG reactivation instruction from the base station device 200 .
- the MAC of the terminal device 100 may perform SCG (re)activation and start transmitting UL data without notifying the RRC of the terminal device 100 that UL data has been generated. Before starting transmission of UL data, the terminal device 100 may perform SCG resetting with synchronization if there is resetting with SCG synchronization that was not immediately executed in step S107.
- the terminal device 100 for example, in the SCG deactivation instruction received in step S104, an instruction regarding processing when UL data occurs during SCG deactivation (for example, without sending an SCG reactivation request, SCG (re) whether or not activation can be performed), you may follow this instruction.
- the base station device 200 determines whether SCG (re)activation of the terminal device 100 is necessary.
- the base station apparatus 200 determines that the SCG (re)activation of the terminal apparatus 100 is necessary when, for example, some or all of the following (conditions 4-1) to (conditions 4-3) are satisfied.
- the base station apparatus 200 may determine whether or not SCG reactivation of the terminal apparatus 100 is necessary at any time while the terminal apparatus 100 is in SCG deactivation.
- the base station device 200 transmits an SCG reactivation instruction (permitting) to perform SCG (re)activation to the terminal device 100 (step S111).
- the SCG reactivation indication is, for example, an RRC message.
- the SCG reactivation indication may be, for example, an RRC reconfiguration message or a message with another name.
- the SCG reactivation indication may be an RRC reconfiguration message that does not include the SCG deactivation indication.
- the terminal device 100 Upon receiving the SCG reactivation instruction, the terminal device 100 performs SCG reactivation processing (step S112).
- the SCG reactivation process is a process in which the terminal device 100 (re)activates the SCG.
- the RRC of the terminal device 100 may transmit the third notification to the PDCP that transmitted the second notification in step S105.
- the third notification may be a notification indicating that SCG (re)activation is to be performed, or a notification indicating that SCG deactivation is to be canceled, for example, "SCG (re)activated” or " It may be a notification indicating that uplink transmission of the SCG has been permitted (resumed).
- the PDCP of the terminal device 100 resumes uplink transmission of the SCG.
- FIG. 16 is a sequence diagram showing an RRC message transmission/reception operation when at least the radio bearer on the SCG side of the terminal device 100 is in a suspended state (the radio bearer is suspended). At least the radio bearer on the SCG side of the terminal device 100 is being suspended, for example, when the terminal device 100 is in the RRC inactive mode. Further, at least the radio bearer on the SCG side of the terminal device 100 is being suspended, for example, the terminal device 100 detects an SCG failure and the SCG transmission of the radio bearer is suspended.
- the radio bearer is suspended means, for example, a state in which no transmission is performed in the radio bearer, a state in which reception is not performed in the radio bearer, and data processing in some or all entities set in the radio bearer. It may refer to a state of part or all of the state where is not performed.
- the SCG transmission of a radio bearer being suspended may include, for example, a state in which no transmission is performed in the radio bearer associated with the SCG.
- At least the terminal device 100 whose SCG-side radio bearer is in suspension may be in SCG deactivation. Also, at least the terminal device 100 in which the SCG-side radio bearer is in suspension may be in SCG (re)activation.
- the RRC message may be an RRC restart message when the terminal device 100 is in the RRC inactive mode.
- the terminal device 100 may transmit the RRC restart request message to the base station device 200 before receiving the RRC message from the base station device 200 .
- the RRC message may be an RRC reconfiguration message when the terminal device 100 is in the RRC connection mode. Note that the RRC restart message may include an RRC reconfiguration message, and this RRC reconfiguration message may include the SCG configuration.
- the base station device 200 transmits an RRC message to at least the terminal device 100 whose radio bearer on the SCG side is being suspended (step S113). If the base station apparatus 200 determines that the terminal apparatus 100 resumes transmission of the suspended SCG-side radio bearer (resume), the RRC message includes the 10th parameter, does not include the 11th parameter, and the terminal Send to device 100 . Further, when the base station apparatus 200 determines not to resume transmission of the SCG-side radio bearer suspended by the terminal apparatus 100, the RRC message includes the tenth parameter and the eleventh parameter, and is transmitted to the terminal apparatus 100. do.
- At least the terminal device 100 whose radio bearer on the SCG side is suspended performs processing according to the RRC message received from the base station device 200 (step S114). At least the terminal device 100 whose radio bearer on the SCG side is being suspended is suspended when the RRC message received from the base station device 200 includes the tenth parameter and does not include the eleventh parameter. It determines to resume the transmission of the SCG-side radio bearer that is suspended, and resumes the transmission of the suspended SCG-side radio bearer. Further, at least the terminal device 100 in which the radio bearer on the SCG side is being suspended is suspended when the RRC message received from the base station device 200 includes the tenth parameter and the eleventh parameter. It is determined not to resume the transmission of the radio bearer on the SCG side that is currently active, and the transmission of the suspended SCG side radio bearer is not resumed.
- the RRC message received from the base station apparatus 200 includes the tenth parameter and does not include the eleventh parameter
- the RRC message received from the base station apparatus 200 includes the If 10 parameters are included and the SCG is not deactivated 'or'the RRC message received from the base station apparatus 200 includes the 10th parameter and the SCG is (re)activated'.
- the above "when the RRC message received from base station apparatus 200 includes the tenth parameter and the eleventh parameter” corresponds to "when the RRC message received from base station apparatus 200 includes the tenth parameter is included and the SCG is deactivated” or "the RRC message received from the base station apparatus 200 includes the tenth parameter and the SCG is (re)activated.” .
- the above “resumes the transmission of the suspended SCG-side radio bearer” can be rephrased as “resumes the transmission of the suspended SCG-side radio bearer. Also, perform random access to the SCG.” Also good.
- the above-mentioned “do not resume the transmission of the suspended SCG side radio bearer” can be rephrased as “do not resume the transmission of the suspended SCG side radio bearer and do not perform random access to the SCG”. Also good.
- the tenth parameter described above may be a reset parameter with synchronization.
- the tenth parameter mentioned above may be a reconfiguration parameter with synchronization of the SCG.
- the eleventh parameter mentioned above may be an SCG deactivation indication.
- the SCG deactivation instruction may be a parameter that instructs the terminal device 100 to perform SCG deactivation.
- the SCG deactivation instruction may be a parameter indicating that the SCG of the terminal device 100 is in a deactivated state.
- the SCG deactivation instruction may be a parameter called scg-state.
- the above process of "resuming transmission of the suspended SCG side radio bearer” or “do not resume transmission of the suspended SCG side radio bearer” process is a reconfiguration process with synchronization. It can be done later.
- the above-mentioned "resume transmission of suspended SCG-side radio bearer” or “not resume transmission of suspended SCG-side radio bearer” processing restarts the suspended radio bearer. may be performed after performing the process of resuming a suspended radio bearer, or at the same time as the process of resuming a suspended radio bearer.
- the process of resuming a suspended radio bearer may be, for example, a process of resuming data processing in each entity set in the radio bearer.
- the process of resuming the suspended radio bearers may not be performed for some suspended radio bearers.
- Some suspended radio bearers may eg be the SRB for the source cell group.
- radio bearer on the SCG side may be a radio bearer associated with the SCG.
- the same processing as the processing for the radio bearer on the SCG side described above may be performed for the BH (Backhaul) RLC channel for the IAB (Integrated Access and Backhaul)-MT (Mobile Termination) on the SCG side.
- the SCG transmission to the BH RLC channel for the suspended IAB-MT may be resumed.
- it is determined that "do not resume the transmission of the suspended SCG side radio bearer” it is not necessary to resume the SCG transmission to the BH RLC channel for the suspended IAB-MT.
- the terminal device 100 in which at least the SCG-side radio bearer is being suspended may perform the following process instead of the process of determining whether to resume transmission of the suspended SCG-side radio bearer. good. - If the RRC message contains reconfiguration with synchronization, regardless of whether the RRC message contains an SCG deactivation indication, restart the transmission of the suspended SCG-side radio bearer - As described above After the processing of resuming the transmission of the suspended SCG side radio bearer, perform SCG deactivation processing and / or reconfiguration processing with synchronization
- the DRB setting parameters include a parameter indicating PDCP re-establishment or a parameter indicating PDCP data recovery, and the DRB corresponding to this DRB setting
- the PDCP entity in the DRB corresponding to the DRB configuration of the terminal device 100 (DRB having the same DRB identifier as the DRB identifier included in the DRB configuration parameter) transmits the PDCP status report in the uplink direction.
- this DRB is an SCG bearer, or if it is a split bearer and the primary path is set to SCG, and if the above-mentioned RRC message includes an SCG deactivation instruction
- the terminal device 100 once the SCG is in the deactivation state, in order to transmit the PDCP status report, it is necessary to perform a process of setting the SCG in the (re)activation state, which consumes power.
- the base station device 200 may prevent the terminal device 100 from transmitting control PDUs such as PDCP status reports and/or data PDUs when the terminal device 100 is in SCG deactivation.
- the terminal device 100 may avoid transmitting control PDUs, such as PDCP status reports, and/or data PDUs during SCG deactivation.
- FIG. 17 is a sequence diagram showing RRC message transmission/reception operations that control uplink transmission of control PDUs.
- the base station device 200 performs processing for generating an RRC message to be transmitted to the terminal device 100 (step S115).
- the above RRC message may be, for example, an RRC reconfiguration message, an RRC resumption message, an RRC connection reconfiguration message, or any other message.
- step S115 A first example of the processing in step S115 will be described.
- the base station device 200 By transmitting an RRC message to the terminal device 100, the base station device 200 puts the SCG of the terminal device 100 into a deactivation state, and for the first DRB established in the terminal device 100, PDCP re-establishment and / Or, when instructing PDCP data recovery, it is determined to release the setting of PDCP status report transmission set in the first DRB. Then, the base station apparatus 200 may generate an RRC message indicating to release the setting of PDCP status report transmission set in the above-described first DRB.
- Releasing the PDCP status report transmission configuration configured in the first DRB includes including the DRB configuration parameters for the first DRB in the RRC message, further including the PDCP configuration parameters in the DRB configuration parameters,
- This PDCP setting parameter may not include a parameter (statusReportRequired) for setting PDCP status report transmission. That is, the DRB configuration parameters for the first DRB described above may be included in the RRC message, and the DRB configuration parameters may include PDCP configuration parameters that do not include parameters for configuring PDCP status report transmission. Further, the process of releasing the PDCP status report transmission setting of the first DRB described above may be performed when the PDCP status report transmission is set in the first DRB.
- the first example of the processing in step S115 is the first RRC reconfiguration message transmission or the first RRC restart after the SCG of the terminal device 100 changes from the (re)activation state to the deactivation state. May be done when sending a message.
- step S115 A second example of the processing in step S115 will be described.
- the base station device 200 instructs PDCP re-establishment and/or PDCP data recovery to the first DRB established in the terminal device 100 by transmitting an RRC message to the terminal device 100
- the terminal device 100 It may be determined that the SCG is to be (re)activated, and an RRC message may be generated indicating that the SCG of the terminal device 100 is to be (re)activated.
- step S115 A third example of the processing in step S115 will be described.
- the base station device 200 re-establishes PDCP for the first DRB established in the terminal device 100. and/or may determine not to instruct PDCP data recovery and generate an RRC message indicating not to instruct PDCP re-establishment and/or PDCP data recovery to the first DRB.
- "putting the SCG of the terminal device 100 in a deactivation state” may mean including an SCG deactivation instruction in the RRC message.
- “to (re)activate the SCG of the terminal device 100” may mean not including the SCG deactivation instruction in the RRC message.
- "instruct PDCP re-establishment to the first DRB set in the terminal device 100” means the DRB setting parameters for the first DRB set in the terminal device 100 (same as the first DRB A DRB configuration parameter including the DRB identifier) may be included in the RRC message, and a parameter indicating PDCP re-establishment (reestablishPDCP) may be included in the DRB configuration.
- "instruct PDCP data recovery for the first DRB set in the terminal device 100” means that the DRB setting parameter for the first DRB set in the terminal device 100 is included in the RRC message, and this The DRB configuration may include a parameter (recoverPDCP) that indicates PDCP data recovery.
- "do not instruct PDCP data recovery for the first DRB set in the terminal device 100” means that the DRB setting parameter for the first DRB established in the terminal device 100 is included in the RRC message.
- the DRB configuration parameters for the first DRB established in the terminal device 100 may be included in the RRC message, and the parameter (recoverPDCP) indicating PDCP data recovery may not be included in this DRB configuration.
- the first DRB may be the DRB associated with the SCG of the terminal device 100 .
- the DRB associated with the SCG may be the DRB that is the SCG bearer.
- the DRB associated with the SCG may be a DRB that is a split bearer, or a DRB that is a split bearer and whose primary path is set to the SCG.
- the first DRB may be an AM DRB.
- the base station device 200 transmits the RRC message generated in step S115 to the terminal device 100 (step S116).
- the terminal device 100 performs processing according to the RRC message received from the base station device 200 (step S117).
- the terminal device 100 includes an SCG deactivation instruction in the RRC message received from the base station device 200, and a parameter for instructing PDCP re-establishment in the DRB setting for the first DRB established in the terminal device 100 and / Or if a parameter instructing PDCP data recovery is included, even if PDCP status report transmission is set in the first DRB, it is determined not to transmit the PDCP status report, and the PDCP status report is transmitted. do not have.
- the terminal device 100 includes an SCG deactivation instruction in the RRC message received from the base station device 200, and a parameter for instructing PDCP re-establishment in the DRB setting for the first DRB established in the terminal device 100 and / Or when a parameter instructing PDCP data recovery is included, even if PDCP status report transmission is set in the first DRB, it is determined that PDCP status report transmission is performed after SCG (re)activation. , PDCP status report transmission after SCG (re)activation.
- the first DRB may be the DRB associated with the SCG of the terminal device 100.
- the DRB associated with the SCG may be the DRB that is the SCG bearer.
- the DRB associated with the SCG may be a DRB that is a split bearer, or a DRB that is a split bearer and whose primary path is set to the SCG.
- the first DRB may be an AM DRB.
- the DRB of the QoS flow to DRB mapping rule stored for the second QoS flow ( That is, when the already stored DRB corresponding to the first QoS flow) is a DRB that does not correspond to the second information received from the RRC of the terminal device 100 in the first embodiment, the end marker process I do. Also, even if the terminal device 100 satisfies part or all of the following (conditions 5-1) to (conditions 5-3), the QoS flow to When the DRB of the DRB mapping rule is the DRB corresponding to the second information received from the RRC of the terminal device 100, no end marker processing is performed. Note that the end marker process is a process of constructing an end marker control PDU, mapping it to the DRB before change, and transmitting it to the lower layer.
- step S105 in Embodiment 1 above the second information is notified to the SDAP associated with at least the DRB that satisfies the second condition.
- the terminal device 100 performs part or all of the following processing. good
- the QoS flow to DRB mapping rule may be the QoS flow to DRB mapping rule for the uplink (UL QoS flow to DRB mapping rule).
- the terminal device 100 When the terminal device 100 receives the RRC reconfiguration message, if the RRC reconfiguration message contains the SCG synchronous reconfiguration parameters, the terminal device 100 immediately performs part or all of the SCG synchronous reconfiguration processing. Decide whether to execute or not. When the terminal device 100 determines that part or all of the SCG reset processing with synchronization will not be executed immediately, the terminal device 100 executes the SCG reset processing with synchronization that has not been executed at the time of SCG (re)activation. The terminal device 100 determines not to execute immediately if, for example, some or all of the following conditions are met. ⁇ The SCG is in the process of deactivation.
- the reconfiguration with synchronization of the SCG is accompanied by a change of the masternode security key (KgNB or KeNB) or a change of the AS security key generated from the masternode security key.
- the reconfiguration with synchronization of the SCG is accompanied by a change of the secondary node security key (S-KgNB or S-KeNB) or a change of the AS security key generated from the secondary node security key.
- S-KgNB or S-KeNB secondary node security key
- All the radio bearers to which the SCG RLC bearer is related use the secondary key.
- the base station apparatus 200 determines that it does not want the SCG of the terminal apparatus 100 to immediately execute the reconfiguration with synchronization of the SCG, it does not include the reconfiguration with synchronization parameter in the SCG configuration parameters of the RRC reconfiguration message.
- the base station apparatus 200 determines that it does not want to execute immediately if, for example, some or all of the following conditions are met. ⁇ The SCG is in the process of deactivation.
- the reconfiguration with synchronization of the SCG is accompanied by a change of the masternode security key (KgNB or KeNB) or a change of the AS security key generated from the masternode security key.
- the reconfiguration with synchronization of the SCG is accompanied by a change of the secondary node security key (S-KgNB or S-KeNB) or a change of the AS security key generated from the secondary node security key.
- Radio bearers to which the SCG RLC bearer is associated shall not have any radio bearers using the master key. All radio bearers to which the SCG RLC bearer is associated shall use the secondary key.
- a radio bearer that uses a master key may be a radio bearer whose parameter (keyToUse) indicating whether to use a master key or a secondary key is set to master (or primary).
- a radio bearer that uses a secondary key may be a radio bearer whose parameter (keyToUse) indicating whether to use the master key or the secondary key is set to secondary.
- the terminal device 100 includes a reconfiguration parameter with MCG synchronization in the RRC reconfiguration message received from the base station device 200 during SCG deactivation, but if the reconfiguration with SCG synchronization is not included, Do not resume SCG uplink transmission.
- the terminal device 100 when the terminal device 100 receives an SCG deactivation instruction from the base station device 200, the terminal device 100 performs (process A) for the radio bearer that satisfies (condition A).
- Condition A is an SCG bearer or a split bearer and a primary path is set to the SCG.
- Process A is a process of immediately transmitting or discarding data that has not been transmitted in the PDCP entity of the radio bearer that satisfies (Condition A).
- processing A is, when a request for re-establishment of a PDCP entity of a radio bearer that satisfies (condition A) is made, in the process of re-establishing the PDCP entity, transmission of data for which transmission has not been completed is immediately performed. The processing may be performed at the time of SCG (re)activation (or after SCG (re)activation) without performing it.
- Processing A) is a process of discarding an SDAP control PDU when the PDCP entity of a radio bearer that satisfies (Condition A) receives an SDAP control PDU from an upper layer.
- the RRC of the terminal device 100 receives the SCG deactivation instruction from the base station device 200, it notifies (information A) to the SDAP associated with the radio bearer (DRB) that satisfies (condition A).
- (Information A) is a state in which uplink transmission by the DRB is not possible, such as that the uplink transmission of the DRB is prohibited (stopped), or that the cell group to which the DRB is associated is being deactivated. It is information indicating that there is
- the terminal device 100 transmits the SDAP control SDU to the DRB before the change. do not have.
- the base station apparatus 200 may not generate an end marker when the terminal apparatus 100 is in SCG deactivation. For example, during SCG deactivation, the base station apparatus 200 does not allow the QoS flow associated with the DRB, which is an SCG bearer or split bearer and a primary path is set to the SCG, to be re-associated with another DRB. By controlling such as, the end marker is controlled so that it does not occur.
- the base station apparatus 200 for example, before the SCG deactivation instruction in step S104 in Embodiment 1 above, or in the SCG deactivation instruction, part or all of DRBs that satisfy at least the second condition are associated with DRBs that satisfy at least the second condition. By performing control such as associating a QoS flow with a DRB that does not satisfy at least the second condition, control is performed so that an end marker does not occur.
- the terminal device 100 issues a request for SCG (re)activation to the base station device 200, or whether the terminal device 100 spontaneously performs SCG (re)activation may be instructed by the base station apparatus 200 . That is, the terminal device 100 performs, for example, the following processes.
- the RRC of the terminal device 100 When the RRC of the terminal device 100 receives the SCG deactivation instruction from the base station device 200, it transmits (notification A) to the PDCP entity of the radio bearer corresponding to (condition A).
- (Notification A) is a notification indicating that SCG deactivation is in progress or that uplink transmission on the SCG side is prohibited (interrupted).
- the PDCP entity of the radio bearer corresponding to (Condition A) receives data from the upper layer, the PDCP entity of the terminal device 100 notifies the RRC of the terminal device 100 that UL data is generated.
- the RRC of the terminal device 100 generates an SCG reactivation request and transmits it to the base station device 200 .
- the SCG is (re)activated for the PDCP entity of the radio bearer that transmitted the second notification, or the uplink on the SCG side Send a notification indicating that transmission has started (restarted), etc.
- the terminal device 100 executes a random access procedure so that uplink transmission can be performed.
- the terminal device 100 executes the reconfiguration with synchronization of the SCG, if any, which has not been executed immediately.
- the terminal device 100 can perform appropriate processing when uplink transmission occurs in the RLC bearer on the SCG side during SCG deactivation. Further, as a result, the terminal device 100 notifies the base station device 200 that uplink transmission has occurred in the RLC bearer on the SCG side during SCG deactivation, or autonomously or by the instruction of the base station device 200 , SCG (re)activation can be performed.
- what is described as the function and processing of the terminal device 100 may be the function and processing of the base station device 200.
- the functions and processes described as the functions and processes of the base station apparatus 200 may be the functions and processes of the terminal apparatus 100 .
- the "radio bearer” may be a signaling radio bearer, a data radio bearer, or both a signaling radio bearer and a data radio bearer.
- A may be rephrased as B
- B may include rephrasing B as A in addition to rephrasing A as B.
- condition "B” can be understood as another condition of the condition "A”.
- a terminal device and a base station device In each embodiment, an example of a terminal device and a base station device is described, but the technology disclosed is not limited to this. , electronic devices transported by drones, etc., robots, AV equipment, household appliances, office equipment, vending machines, and other household equipment.
- E-UTRA and NR are used as radio access technologies
- EPC and 5GC are used as examples of core networks, but the disclosed technology is not limited to these.
- the technology disclosed herein may be applied to radio access technologies and networks of different generations, such as the 6th generation and the 7th generation.
- a wireless communication device comprising a transmitting unit that transmits a message to another wireless communication device, and a processing unit that executes processing on the message transmitted by the transmitting unit,
- the processing unit is Including a first parameter in a first RRC (Radio Resource Control) message transmitted to the other wireless communication device, and in a first DRB (Data Radio Bearer) setting parameter included in the first RRC message
- a third parameter is included in the first DRB configuration parameter when the second parameter is included.
- a wireless communication device comprising a transmitting unit that transmits a message to another wireless communication device, and a processing unit that executes processing on the message transmitted by the transmitting unit, The processing unit is When the second parameter is included in the first DRB (Data Radio Bearer) setting parameter included in the first RRC (Radio Resource Control) message transmitted to the other radio communication device, the other radio communication device A wireless communication device characterized by activating a secondary cell group to be set.
- DRB Data Radio Bearer
- RRC Radio Resource Control
- a wireless communication device comprising a transmitting unit that transmits a message to another wireless communication device, and a processing unit that executes processing on the message transmitted by the transmitting unit,
- the processing unit is When the first RRC (Radio Resource Control) message transmitted to the other radio communication device includes the first parameter, the first DRB (Data Radio Bearer) configuration parameter included in the first RRC message includes A wireless communication device that does not include a second parameter.
- RRC Radio Resource Control
- DRB Data Radio Bearer
- the first DRB setting parameter is configuration parameters for a first DRB established by the other wireless device;
- the wireless communication device according to any one of appendices 1 to 3, wherein the first DRB is configured for PDCP (Packet Data Convergence Protocol) status report transmission and associated with a secondary cell group.
- PDCP Packet Data Convergence Protocol
- the second parameter is a parameter that instructs PDCP re-establishment for the PDCP entity corresponding to the first DRB, or a parameter that instructs PDCP data recovery.
- a wireless communication device as described.
- Appendix 7 The radio communication apparatus according to appendix 4, wherein the third parameter is a PDCP setting parameter that does not include a parameter for setting transmission of a PDCP status report.
- a wireless communication device comprising a receiving unit that receives a message from another wireless communication device, and a processing unit that performs processing on the message received by the receiving unit,
- the processing unit is A first RRC (Radio Resource Control) message received from the other radio communication device includes a first parameter, and a first DRB (Data Radio Bearer) configuration parameter included in the first RRC message. includes the second parameter, the wireless communication device does not transmit the PDCP status report.
- RRC Radio Resource Control
- DRB Data Radio Bearer
- the first DRB setting parameter is A setting parameter for the first DRB established by the device, The radio communication apparatus according to appendix 8, wherein the first DRB is configured for PDCP (Packet Data Convergence Protocol) status report transmission and associated with a secondary cell group.
- PDCP Packet Data Convergence Protocol
- a communication method in a wireless communication device that transmits a message to another wireless communication device Including a first parameter in a first RRC (Radio Resource Control) message transmitted to the other wireless communication device, and in a first DRB (Data Radio Bearer) setting parameter included in the first RRC message
- a communication method comprising: if a second parameter is included, a third parameter is included in the first DRB configuration parameter.
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Abstract
Description
図1は、通信システムの構成例を示す図である。図1に示す通信システムは、端末装置100、基地局装置200-1、200-2及びコアネットワーク300を有する。この通信システムは、端末装置100が、基地局装置200-1又は基地局装置200-2と通信を行う無線通信システムであっても良いし、端末装置100が、基地局装置200-1及び基地局装置200-2とMR-DCで通信を行う無線通信システムであっても良い。例えばMR-DCで通信が行われる場合、基地局装置200-1は、マスター基地局装置であり、基地局装置200-2は、セカンダリ基地局装置である。以降、マスター基地局装置をMN(マスターノード:Master Node)、セカンダリ基地局装置をSN(セカンダリノード:Secondly Node)と呼ぶ場合がある。
図2は、基地局装置200の構成例を示すブロック図である。基地局装置200は、プロセッサ210、ストレージ220、メモリ230、無線通信回路240及びネットワークインタフェース(NI:Network Interface)250を有する通信装置又は中継装置である。
図3は、端末装置100の構成例を示すブロック図である。端末装置100は、プロセッサ110、ストレージ120、メモリ130及び無線通信回路140を有する通信装置である。
通信システムのプロトコルスタックの例について説明する。通信システムにおいて、データの送受信を行う一連のプロトコルを階層構造で示したものをプロトコルスタックと呼ぶ。以下においては、基地局装置200がeNB又はgNBであり、コアネットワーク300がEPC又は5GCである場合について説明する。また、端末装置100(UE:User Equipment)は、E-UTRA及びNRのうちの一方又は両方に対応するものとする。
・UM DRB(後述)及びSRB(後述)におけるステート変数の初期化
・上位レイヤから提供されたセキュリティアルゴリズム及びセキュリティ鍵の適用
・送信側において、送信が完了していない及び/又は送信が成功していないデータの送信
・PDCPステータスレポート送信(PDCPステータスレポート送信が設定されている場合)
また、PDCPデータリカバリ処理は、以下の処理を含む
・送信側において、送信が成功していないデータの送信
・PDCPステータスレポート送信(PDCPステータスレポート送信が設定されている場合)
通信システムで使用されるチャネルについて説明する。以下、NRに対応するチャネルの例を示すが、使用されるチャネルは以下に限定されない。また、同一名称のチャネルが、NR以外のRAT(例えばE-UTRA)においても、同一又は類似の用途で使用され得る。
PBCH(Physical Broadcast CHannel)は、基地局装置200から端末装置100へ報知情報を送信するために用いられるチャネルである。
BCH(Broadcast CHannel)は、物理チャネルであるPBCHにマップされる。
BCCH(Broadcast Control CHannel)は、システム情報を報知するためのダウンリンクチャネルであり、トランスポートチャネルのBCHにマップされる。
RRCメッセージについて説明する。RRCメッセージは、セルにおいて通信を行うために必要な情報を含むメッセージであり、MIB(Master Information Block)及びSIB(System Information Block)などを含む。RRCメッセージに含まれるパラメータは、フィールド又は情報要素(IE:Information Element)と呼ばれることがある。
通信システムの無線ベアラの例について説明する。
シグナリング無線ベアラ(SRB:Signaling Radio Bearer)は、RRCメッセージやNASメッセージを送信するための無線ベアラである。
データ無線ベアラ(DRB:Data Radio Bearer)は、ユーザデータを送信するための無線ベアラである。
SRB1及びSRB2は、1つのPDCPと、1つ又は複数のRLCベアラとで構成される。RLCベアラは、RLCとMACロジカルチャネルで構成される。MACは、以下で説明するセルグループごとに存在するものとする。RLCのモードは、AMである。SRB3は、1つのPDCPと、1つのRLCベアラとで構成される。RLCのモードは、AMである。
セルグループ(CG:Cell Group)は、MR-DCにおけるセルの構成を示す。MR-DCにおいて、セルグループは、マスターセルグループ(MCG:Master Cell Group)とセカンダリセルグループ(SCG:Secondary Cell Group)とに分類される。
MR-DCの種類について説明する。MR-DCは、マスターノード及びセカンダリノードの基地局装置200の種別(対応する世代)や、コアネットワーク300の種別(対応する世代)によって、4つの種類に分類される。
MR-DCにおけるベアラタイプについて説明する。以下、マスターノードでPDCPが終端し、マスターノード側にPDCPを有する構成を、MN-terminatedと呼ぶ場合がある。また、セカンダリノードでPDCPが終端し、セカンダリノード側にPDCPを有する構成を、SN-terminatedと呼ぶ場合がある。ベアラタイプは、以下の6種類に分類される。
(A)MN-terminatedで、RLCベアラがMCG側に存在するMCGベアラ
(B)MN-terminatedで、RLCベアラがMCG及びSCGの両方に存在するSplit(スプリット)ベアラ
(C)MN-terminatedで、RLCベアラがSCG側に存在するSCGベアラ
(D)SN-terminatedで、RLCベアラがMCG側に存在するMCGベアラ
(E)SN-terminatedで、RLCベアラがMCG及びSCGの両方に存在するSplitベアラ
(F)SN-terminatedで、RLCベアラがSCG側に存在するSCGベアラ
同期付き再設定(ハンドオーバ)について説明する。同期付き再設定(Reconfiguration With Sync)は、基地局装置200が端末装置100に送信するRRC再設定メッセージに、同期付き再設定を行う旨のパラメータ(reconfigurationWithSync:以降「同期付き再設定パラメータ」と呼ぶ場合がある)を含めることにより、端末装置100において実行される手順である。
端末装置100において、あるQoSフローが対応(map)するDRBが変更されたとき、変更前のDRBに対してエンドマーカーコントロールPDUが送信される。QoSフローは、同じQoS要求を有するサービスデータフロー(SDF:Service Data Flow)であり、QoSフロー識別子(QFI)により識別される。SDFは、例えばIPフロー又はEthernetフローなどであり、上位レイヤによって異なる。
端末装置100のRRC状態は、端末装置100のRRC接続に関する状態を示す。基地局装置200とのRRC接続が確立されていない状態を、RRCアイドル(idle)モード(RRC_IDLE)と呼ぶ場合がある。基地局装置200とのRRC接続が確立されている状態を、RRC接続モード(RRC_CONNECTED)と呼ぶ場合がある。基地局装置200とのRRC接続が一時停止(サスペンド)されている状態を、RRCイナクティブ(inactive)モード(RRC_INACTIVE)と呼ぶ場合がある。なお、コアネットワーク300がEPCの場合、基地局装置200とのRRC接続が一時停止している状態は、RRCのサスペンドなど別の名称で呼ばれても良い。
端末装置100は、MR-DCが設定されている場合にSCG失敗を検出すると、MCGを介して、マスターノードに対しSCG失敗情報に関するメッセージ(SCGFailureInformation)を送って良い。SCG失敗は、例えばSCG側での物理レイヤ同期外れの時、SCG側でのランダムアクセス失敗の時、SCG側でのRLC再送回数が所定の閾値を超えた時、SCGの同期付き再設定失敗の時、SCG設定に従った処理ができない時、SRB3の完全性検証に失敗した時などに検出されて良い。SCG失敗情報に関するメッセージを送信する際、端末装置100は、すべての無線ベアラに対するSCG送信のサスペンド、すなわちSCGに関連付いているすべての無線ベアラの送信のサスペンドを含む処理を行って良い。なお、(NG)EN-DCの場合は、SCGFailureInformationに代えて、SCGFailureInformationNRが送られても良い。SCGFailureInformation及びSCGFailureInformationNRは、例えばDCCHロジカルチャネルを用いて送信される。
(NG)EN-DC又はNR-DCにおいて、端末装置100に設定されているSCGを非活性(SCG deactivation)にすることにより、セカンダリノードと端末装置100との通信を制限する場合がある。以下、SCGが非活性状態(「ディアクティベーション状態」又は「ディアクティベート状態」ともいう)にあることをSCGディアクティベーション中と呼ぶ場合がある。また、SCGが活性状態(「アクティベーション状態」又は「アクティベート状態」ともいう)であることをSCG(リ)アクティベーション中と呼ぶ場合がある。また、SCGを非活性状態にすることをSCGディアクティベーションと呼ぶ場合がある。また、非活性状態のSCGを活性状態にすることをSCG(リ)アクティベーションと呼ぶ場合がある。さらに、以降、「リアクティベーション」及び「リアクティベート」は、それぞれ「アクティベーション」及び「アクティベート」を含むものとする。
・SCGのRRC接続の再設定に関するメッセージ(例えばRRC再設定メッセージ)を基地局装置200から受信した場合、このメッセージに従った処理を実行する
・SCG側のアップリンク送信を行わない
・SCG側のアップリンクデータに対する処理を実行しても良い
・PSCellにおいてPDCCHのモニタリング(受信)は行わない
・SCG側のPUSCHの送信は行わない
実施の形態1について説明する。通信システムは、端末装置100とセカンダリノード(基地局装置200)との通信において、SCGディアクティベーション中からSCG(リ)アクティベーション中への切り替え、又はSCG(リ)アクティベーション中からSCGディアクティベーション中への切り替えを適切に制御する。適切な制御とは、例えば、省電力化を実現するために、不要な切り替えを行わないように制御したり、必要なタイミングまで切り替えタイミングを延期するようにしたりすることである。通信システムは、端末装置100とセカンダリノード(基地局装置200)との通信において、SCGディアクティベーション中に不要なアップリンク送信が行われないように制御し、省電力を実現する。
図12は、SCGディアクティベーションへの遷移動作を示すシーケンス図である。基地局装置200は、例えばMR-DCにおけるマスターノードである。図12におけるMR-DCは、例えば(NG)EN-DCやNR-DCを含む。また、図12のシーケンス上、基地局装置200は1つであるが、マスターノードとセカンダリノードを含む複数の基地局装置200があってもよい。また、図12のシーケンス上、基地局装置200が送受信するメッセージは、マスターノード及びセカンダリノードのいずれが送受信しても良い。図12における基地局装置200が実行する処理をマスターノードが実行する場合、端末装置100からセカンダリノードに送信されたメッセージは、基地局間通信を介してマスターノードに送信されるものとする。また、基地局装置200が実行する処理は、それぞれマスターノード及びセカンダリノードのいずれによって実行されても良い。なお、上述した条件を満たすため、端末装置100は、SCGディアクティベーション中、セカンダリノードにメッセージを送信しないとともに、セカンダリノードからのPDCCHの受信は行わないこととする。
(1)SCGがディアクティベートされると見なす
(2)下位レイヤにSCGがディアクティベートされたことを通知する
(3)端末装置100がSCGディアクティベーション指示を含むRRCメッセージを受信する前に、RRC接続モード又はRRCイナクティブモードであった場合、SRB3のPDCPエンティティに対しSDU破棄(SDU discard)をトリガ(trigger)する及び/又はSRB3のRLCエンティティを再確立する
(4)SCGが(リ)アクティベートされると見なす
(5)端末装置100がSCGディアクティベーション中である場合、下位レイヤにSCGが(リ)アクティベートされたことを通知する
・第2無線ベアラのPDCPにおいて送信が完了していないデータを、直ちに(SCGがディアクティベートされるまでの間に)送信する、又はすべて破棄する
・第2無線ベアラのPDCPにおいてリオーダリングタイマーが作動していれば停止し、格納されているすべてのPDCP SDUをヘッダ解凍後に順番通りに上位レイヤに送信する
・第2無線ベアラのRLCを再確立する
・第2無線ベアラのPDCPにPDCPステータスレポート送信の設定が行われている場合には、PDCPステータスレポートを送信する
・当該DRBのDRB識別子(DRB identifier)
・当該DRBに関連付けられたQoSフロー識別子
図13は、端末装置100がSCGディアクティベーション中のRRCメッセージ送受信動作を示すシーケンス図である。
・SCGの同期付き再設定を行うことを指示する情報
・SCGの同期付き再設定を行うことを指示する情報を含む場合、少なくとも第1条件に合致しない場合、直ちにSCGの同期付き再設定を実行するように指示する情報
・SCGの同期付き再設定を行うことを指示する情報を含む場合、少なくとも第1条件に合致する場合、SCG(リ)アクティベーション時に、SCGの同期付き再設定を実行するよう指示する情報
・SCGの同期付き再設定を行うことを指示する情報を含む場合、SCGディアクティベーション中であれば、直ちにSCGの同期付き再設定を実行するよう指示する情報
・SCGの同期付き再設定を行うことを指示する情報を含む場合、SCG(リ)アクティベーション時にSCGの同期付き再設定を実行するよう指示する情報
・同期付き再設定パラメータ(同期付き再設定の実行を指示する旨を示す)
・PDCP再確立を指示するパラメータ(PDCPの再確立の実行を指示する旨を示す)
・QoS flow to DRB mapping ruleの設定を意味するパラメータ(QoSflow to DRB mapping ruleの再設定の実行を指示する旨を示す)
端末装置100は、受信したRRC再設定メッセージが同期付き再設定パラメータを含む場合、所定条件を満たすと、SCG側無線ベアラがサスペンドされていればサスペンドされているSCG側無線ベアラのアップリンク通信を再開する。所定条件は、例えばSCGディアクティベーション中でないことである。なお、「所定条件を満たすと」とは、「所定条件を満たすか否かを判断し、満たすと判断した場合には」と言い換えても良い。
・CellGroupConfigの手順(プロシージャ)がMCG設定パラメータによって開始(initiate)され、かつSCGディアクティベーション中でないこと
・当該手順がSCG設定パラメータによって開始されたこと
・CellGroupConfigの手順(プロシージャ)がMCG設定パラメータによって開始(initiate)され、かつSCGディアクティベーション中でないこと
・当該手順がSCG設定パラメータによって開始され、SCGディアクティベーション中であり、かつSCGの同期付き再設定を直ちに行うことを意味するパラメータが含まれている(又はSCGの同期付き再設定を直ちに行わないことを意味するパラメータが含まれていない)こと
・当該手順がSCG設定パラメータによって開始され、SCGディアクティベーション中でないこと
・SCGディアクティベーション中でないこと
・SCGディアクティベーション中で、かつSCGの同期付き再設定を直ちに行うことを意味するパラメータが含まれている(又はSCGの同期付き再設定を直ちに行わないことを意味するパラメータが含まれていない)こと
・端末装置100は、SCGの同期付き再設定処理を直ちに実行しても良い
端末装置100は、受信したRRC再設定メッセージがPDCP再確立を指示するパラメータを含む場合、例えばPDCP再確立を直ちに行う。この場合、端末装置100は、少なくとも第2条件を満たす一部又は全部の無線ベアラのPDCPにおいて、送信が完了していないデータがあれば、SCGが(リ)アクティベーションされた後に、当該データを送信しても良い。
端末装置100は、受信したRRC再設定メッセージが、QoS flow to DRB mapping ruleの設定を意味するパラメータ(mappedQoS-FlowToAdd)を含む場合、以下の処理を行う。なお、QoS flow to DRB mapping ruleは、例えばQoSフローとDRBの対応関係を示す。
図14は、SCGディアクティベーション中のSCGリアクティベーション動作を示すシーケンス図である。端末装置100がSCGディアクティベーション中、ULデータが到着することがある(ステップS108)。ULデータの到着は、基地局装置200に送信するデータが発生したことを示し、例えばPDCP SDUがPDCPに到着する(送信される)ことであっても良いし、SCG側でMAC SDUがMACに到着する(送信される)ことであっても良い。
端末装置100のRRCからPDCPへ第2通知が行われている場合(PDCPが、少なくとも第2条件を満たす無線ベアラであることを認識している場合)、PDCP SDUが到着したことを検出した端末装置100のPDCPは、端末装置100のRRCに対して、ULデータが発生したことを通知する。ここで、端末装置100は、スプリットベアラが確立されSCGにプライマリパスがある場合、上位レイヤからPDCP SDUを受け取った際に端末装置100のRRCへの通知を行っても良い。一方、端末装置100は、スプリットベアラが確立されMCGにプライマリパスがある場合、送信データ量が所定の閾値を超えた又は超えそうな場合に、端末装置100のRRCへの通知を行っても良い。
端末装置100のRRCの処理は、上述したPDCP SDUがPDCPに到着した場合と同様である。端末装置100のMACは、MAC SDUの到着を検出した場合、端末装置100のRRCに対し、ULデータが発生したことを通知する。また、端末装置100のMACは、SCG(リ)アクティベーションを行い、ULデータを送信するための準備(例えばセカンダリノードに対するランダムアクセス手順の実行など)を行っても良い。端末装置100は、ステップS107などにおいて即時実行されなかったSCGの同期付き再設定があれば、先行してSCGの同期付き再設定を行っても良い。また、端末装置100のMACは、基地局装置200からSCGリアクティベーション指示を受信した後で、SCG(リ)アクティベーションに関するすべての処理を行っても良い。
図16は、端末装置100の少なくともSCG側の無線ベアラが一時停止(サスペンド)状態にある場合(無線ベアラがサスペンド中)のRRCメッセージ送受信動作を示すシーケンス図である。端末装置100の少なくともSCG側の無線ベアラがサスペンド中であるとは、例えば端末装置100がRRCイナクティブモードである場合であって良い。また、端末装置100の少なくともSCG側の無線ベアラがサスペンド中であるとは、例えば端末装置100がSCG失敗を検出し、無線ベアラのSCG送信がサスペンドされている状態であって良い。また、無線ベアラがサスペンド中であるとは、例えば無線ベアラにおける送信が行われない状態、無線ベアラにおける受信が行われない状態、及び無線ベアラに設定されている一部又は全部のエンティティにおいてデータ処理が行われない状態の一部又は全部の状態を指しても良い。また、無線ベアラのSCG送信がサスペンドされているとは、例えばSCGに関連付けられた無線ベアラにおける送信が行われない状態を含む状態であって良い。
・RRCメッセージに同期付き再設定が含まれる場合には、RRCメッセージにSCGディアクティベーション指示が含まれているか否かに関わらず、サスペンドされているSCG側の無線ベアラの送信を再開する
・上述のサスペンドされているSCG側の無線ベアラの送信を再開する処理の後、SCGディアクティベーション処理及び/又は同期付き再設定処理を行う
端末装置100がDRB設定パラメータを含むRRCメッセージを受信した際、このDRB設定パラメータに、PDCP再確立を指示するパラメータ又はPDCPデータリカバリを指示するパラメータが含まれ、さらにこのDRB設定に対応するDRBにPDCPステータスレポート送信が設定されている場合、端末装置100のDRB設定に対応するDRB(DRB設定パラメータに含まれるDRB識別子と同じDRB識別子を持つDRB)におけるPDCPエンティティは、PDCPステータスレポートをアップリンク方向に送信する。もし、このDRBがSCGベアラである場合、又はスプリットベアラであってプライマリパスがSCGに設定されていた場合で、かつ上述のRRCメッセージにSCGディアクティベーション指示が含まれている場合、端末装置100は、一旦SCGをディアクティベーション状態にした後、PDCPステータスレポートを送信するために、SCGを(リ)アクティベーション状態にする処理を行う必要があり、電力が消費される。この問題を避けるため、基地局装置200は、端末装置100がSCGディアクティベーション中である時、端末装置100がPDCPステータスレポート等のコントロールPDU及び/又はデータPDUを送信しないようにして良い。また、この問題を避けるため、端末装置100は、SCGディアクティベーション中である時、PDCPステータスレポート等のコントロールPDU及び/又はデータPDUを送信しないようにして良い。
端末装置100がSCGディアクティベーション中、端末装置100のSDAPエンティティにおいて、RDI(Reflective QoS flow to DRB mapping Indication)が「1」にセットされ、ダウンリンクSDAPデータPDUが受信され、受信されたダウンリンクSDAPデータPDUに、第2のQoSフローに対するQoSフロー識別子(QFI)が含まれている場合について考える。なお、このダウンリンクSDAPデータPDUの受信は、MCGにRLCベアラが関連付けられているDRBを介して行われて良い。
・SCGディアクティベーション中であること
・SCGの同期付き再設定が、マスターノードのセキュリティ鍵(KgNB又はKeNB)の変更、又はマスターノードのセキュリティ鍵から生成されるASセキュリティ鍵の変更に伴うものであること
・SCGの同期付き再設定が、セカンダリノードのセキュリティ鍵(S-KgNB又はS-KeNB)の変更、又はセカンダリノードのセキュリティ鍵から生成されるASセキュリティ鍵の変更に伴うものであること
・SCG RLCベアラが関連する無線ベアラに、マスター鍵を使う無線ベアラが存在しないこと
・SCG RLCベアラが関連する無線ベアラは、すべてセカンダリ鍵を使うこと
・基地局装置200から、SCG(リ)アクティベーション時に実行するように指示されていること
・SCGディアクティベーション中であること
・SCGの同期付き再設定が、マスターノードのセキュリティ鍵(KgNB又はKeNB)の変更、又はマスターノードのセキュリティ鍵から生成されるASセキュリティ鍵の変更に伴うものであること
・SCGの同期付き再設定が、セカンダリノードのセキュリティ鍵(S-KgNB又はS-KeNB)の変更、又はセカンダリノードのセキュリティ鍵から生成されるASセキュリティ鍵の変更に伴うものであること
・SCG RLCベアラが関連する無線ベアラに、マスター鍵を使う無線ベアラが存在しないこと
・SCG RLCベアラが関連する無線ベアラは、すべてセカンダリ鍵を使うこと
上記各実施の形態は、それぞれ組み合わせても良い。また、シーケンス上のメッセージは、上述した順序通りに送受信される必要はなく、順序が入れ変わっても良い。また、シーケンス上のメッセージは、一部送受信されなくても良い。例えば、端末装置100におけるSCGディアクティベーション中の処理は、端末装置100がSCGディアクティベーション中であれば良く、シーケンス上のメッセージの送受信が省略されても良い。
前記処理部は、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
ことを特徴とする無線通信装置。
前記処理部は、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記他の無線通信装置に設定されるセカンダリセルグループをアクティベート状態にする
ことを特徴とする無線通信装置。
前記処理部は、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含める場合、前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含めない
ことを特徴とする無線通信装置。
前記他の無線装置によって確立された第1のDRBに対する設定パラメータであり、
前記第1のDRBは、PDCP(Packet Data Convergence Protocol)ステータスレポート送信が設定され、かつセカンダリセルグループに関連付けられる
ことを特徴とする付記1~3のいずれかに記載の無線通信装置。
ことを特徴とする付記4に記載の無線通信装置。
ことを特徴とする付記4に記載の無線通信装置。
ことを特徴とする付記4に記載の無線通信装置。
前記処理部は、
前記他の無線通信装置から受信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータが含まれ、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータが含まれる場合、PDCPステータスレポートの送信を行わない
ことを特徴とする無線通信装置。
自装置が確立した第1のDRBに対する設定パラメータであり、
前記第1のDRBは、PDCP(Packet Data Convergence Protocol)ステータスレポート送信が設定され、かつセカンダリセルグループに関連付けられる
ことを特徴とする付記8に記載の無線通信装置。
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
処理を有することを特徴とする通信方法。
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
処理を実行させることを特徴とする通信プログラム。
120、220 ストレージ
121、221 無線通信プログラム
122 端末側プログラム
130、230 メモリ
140、240 無線通信回路
222 基地局側プログラム
250 NI
Claims (8)
- 他の無線通信装置へメッセージを送信する送信部と、前記送信部によって送信されるメッセージに対する処理を実行する処理部と、を備える無線通信装置であって、
前記処理部は、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
ことを特徴とする無線通信装置。 - 前記第1のDRB設定パラメータは、前記他の無線通信装置によって確立された第1のDRBに対する設定パラメータであり、
前記第1のDRBは、PDCP(Packet Data Convergence Protocol)ステータスレポート送信が設定され、かつセカンダリセルグループに関連付けられる
ことを特徴とする請求項1に記載の無線通信装置。 - 前記第1のパラメータは、セカンダリセルグループをディアクティベーション状態にすることを示すパラメータである
ことを特徴とする請求項2に記載の無線通信装置。 - 前記第2のパラメータは、前記第1のDRBに対応するPDCPエンティティに対してPDCP再確立を指示するパラメータ、又はPDCPデータリカバリを指示するパラメータである
ことを特徴とする請求項2に記載の無線通信装置。 - 前記第3のパラメータは、PDCPステータスレポートの送信を設定するパラメータを含まないPDCP設定パラメータである
ことを特徴とする請求項2に記載の無線通信装置。 - 他の無線通信装置からのメッセージを受信する受信部と、前記受信部によって受信されるメッセージに対する処理を実行する処理部と、を備える無線通信装置であって、
前記処理部は、
前記他の無線通信装置から受信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータが含まれ、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータが含まれる場合、PDCPステータスレポートの送信を行わない
ことを特徴とする無線通信装置。 - 他の無線通信装置へメッセージを送信する無線通信装置における通信方法であって、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
処理を有することを特徴とする通信方法。 - 他の無線通信装置へメッセージを送信する無線通信装置が有するコンピュータに、
前記他の無線通信装置へ送信される第1のRRC(Radio Resource Control)メッセージに第1のパラメータを含め、かつ前記第1のRRCメッセージに含まれる第1のDRB(Data Radio Bearer)設定パラメータに第2のパラメータを含める場合、前記第1のDRB設定パラメータに第3のパラメータを含める
処理を実行させることを特徴とする通信プログラム。
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JP2017514367A (ja) * | 2014-03-28 | 2017-06-01 | 富士通株式会社 | ベアラ管理装置、方法及び通信システム |
JP2018521604A (ja) * | 2015-05-15 | 2018-08-02 | シャープ株式会社 | データ無線ベアラを再構成する方法及びユーザ装置 |
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JP2017514367A (ja) * | 2014-03-28 | 2017-06-01 | 富士通株式会社 | ベアラ管理装置、方法及び通信システム |
JP2018521604A (ja) * | 2015-05-15 | 2018-08-02 | シャープ株式会社 | データ無線ベアラを再構成する方法及びユーザ装置 |
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"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Packet Data Convergence Protocol (PDCP) specification (Release 16)", 3GPP TS 38.323, no. V16.6.0, 23 December 2021 (2021-12-23), pages 1 - 40, XP052083422 * |
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