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WO2023030887A1 - Procédés et appareils de radiomessagerie d'un terminal - Google Patents

Procédés et appareils de radiomessagerie d'un terminal Download PDF

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Publication number
WO2023030887A1
WO2023030887A1 PCT/EP2022/072958 EP2022072958W WO2023030887A1 WO 2023030887 A1 WO2023030887 A1 WO 2023030887A1 EP 2022072958 W EP2022072958 W EP 2022072958W WO 2023030887 A1 WO2023030887 A1 WO 2023030887A1
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WIPO (PCT)
Prior art keywords
terminal device
cell group
secondary cell
downlink data
node
Prior art date
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PCT/EP2022/072958
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English (en)
Inventor
Subramanya CHANDRASHEKAR
Srinivasan Selvaganapathy
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Nokia Technologies Oy
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Nokia Technologies Oy
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Publication of WO2023030887A1 publication Critical patent/WO2023030887A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • Various example embodiments relate to an apparatus comprising at least one processor.
  • Wireless communications systems may e.g. be used for wireless exchange of information between two or more entities, e.g. comprising one or more terminal devices, e.g. user equipment (UE) , and one or more network devices such as e.g. base stations.
  • UE user equipment
  • network devices such as e.g. base stations.
  • Some terminal devices are capable of Dual Connectivity (DC) , for example (5G) NR (New Radio) Dual Connectivity, NR-DC.
  • DC Dual Connectivity
  • a terminal device may be connected to a first base station, for example gNB, which may act as a master node, and to a second base station, for example gNB, which may act as a secondary node .
  • Some exemplary embodiments relate to an apparatus , comprising at least one processor, and at least one memory storing instructions , the at least one memory and the instructions configured to , with the at least one processor, cause a master node to receive , from a secondary node , a downlink data noti fication indicating downlink data arrival associated with a secondary cell group data radio bearer, and to transmit a paging message to a terminal device configured with the secondary cell group, the paging message indicating the downlink data arrival associated with the secondary cell group data radio bearer to the terminal device .
  • the apparatus may be an apparatus for a wireless communications system .
  • the apparatus or its functionality, respectively may be provided in a base station, for example gNB, of the communications system .
  • a base station for example gNB
  • the downlink data noti fication may be transmitted from the secondary node to the master node using an Xn interface according to some accepted standards .
  • the paging message is a radio resource control (RRC ) paging message , for example according to some accepted standards .
  • RRC radio resource control
  • the apparatus according to the embodiments or its functionality, respectively may be used for or within wireless communications systems, e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as 5G (fifth generation) or other radio access technology.
  • wireless communications systems e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as 5G (fifth generation) or other radio access technology.
  • 3GPP third generation partnership project
  • radio standards such as 5G (fifth generation) or other radio access technology.
  • the apparatus according to the embodiments may be used for a distributed NR gNB with an NR-DC bearer configuration with central unit (CU) - distributed unit (DU) architecture, wherein at least one of the following aspects apply: a) A central unit control plane (CU-CP) may assume roles of both a master node and secondary node logical entity. b) A master cell group distributed unit, MCG-DU, and a secondary cell group distributed unit, SCG-DU, may host for example two data radio bearers, DRBs, belonging to two different protocol data unit, PDU, sessions, which may for example be offered by two different user plane functions, UPFs, for example of a core network, GN.
  • CU-CP central unit control plane
  • MCG-DU master cell group distributed unit
  • SCG-DU secondary cell group distributed unit
  • DRBs data radio bearers
  • PDU protocol data unit
  • UPFs for example of a core network, GN.
  • a terminal device such as a user equipment, UE
  • the NR-DC for the UE is not involving a split bearer, but for example offering two different services, e.g. : Service 1 via the MCG-DU in a first frequency range, for example FR1 according to some accepted standards, and Service 2 via the SCG-DU in a second frequency range different from the first frequency range, for example FR2 according to some accepted standards .
  • the use case characterized by aspects a) , b) , c) above may motivate to provide small data transmission, SDT, for example without radio resource control connection establishment, for a terminal device, e.g. UE, with NR-DC.
  • SDT small data transmission
  • some SCG bearers for example in the second frequency range FR2, may not be able to be reconfigured as MCG bearers, if SDT is expected of those bearers.
  • SDT may be used for application scenarios where a UE needs to send for example only a single packet of uplink transmission data, for example from a battery efficient state such as e.g. a radio resource control, RRC, idle or inactive state according to some accepted standards (RRC-IDLE/RRC-INACTIVE) .
  • a battery efficient state such as e.g. a radio resource control, RRC, idle or inactive state according to some accepted standards (RRC-IDLE/RRC-INACTIVE) .
  • RRC-IDLE/RRC-INACTIVE some accepted standards
  • receiving the downlink data notification from the secondary node and transmitting the paging message to the terminal device configured with the secondary cell group may e.g. occur after the terminal device has entered the inactive state, e.g. RRC-INACTIVE state.
  • the downlink data notification may be sent by the secondary node to the master node when the downlink data is received at the secondary node for a terminal device operating in radio resource control (RRC) in
  • a terminal device e.g. UE, may store a configuration of a last (e.g., preceding) RRC connection, for example along with bearer configurations, for example associated with both the MCG and the SCG.
  • a network, NW can resume to dual connectivity, DC, in a comparatively short time with a comparatively lesser signaling overhead.
  • the principle according to the embodiments may e.g. be used for terminal devices such as UE having dual connectivity in RRC-CONNECTED state, which are transitioned to an RRC inactive state according to some accepted standards, e.g. RRC-INACTIVE, wherein the UE may preserve the UE context, which may e.g. include higher layer configurations, user plane tunnel information and bearer mapping for SCG in RRC- INACTIVE state, but may e.g. only release a physical layer resource.
  • the configurations e.g. UE context
  • the principle according to the embodiments may e.g. be used for enabling SDT related with SCG, SCG-SDT, e.g. for UE with NR-DC configuration in RRC INACTIVE state.
  • an efficient paging procedure for UEs in such configuration is provided, for example avoiding paging in cells of several, for example all, frequency layers, whereas the bearers are configured for specific cells of frequency layer.
  • a quick resume e.g. to an RRC connected state according to some accepted standards, may also be provided.
  • a reception of downlink, DL, data e.g. from a core network, CN, may occur at a central unit user plane, CU-UP, of a master node or a secondary node, e.g. depending on whether the downlink data belongs to a data radio bearer of the MCG or of the SCG.
  • the situation of received DL data for an SCG DRB for example at a central unit user plane of the secondary node (s-CU-UP) , is considered.
  • the instructions when executed by the at least one processor, further cause the master node to transmit a configuration request to the secondary node, for example to request a secondary cell group small data transmission, SCG SDT, configuration for a terminal device, the configuration request causing the secondary node to provide a configuration response comprising information on at least one primary secondary cell, PSCell, wherein the PSCell is e.g. to be included in a radio access network based notification area, RNA, of the terminal device, and, for example, on a SCG SDT inactive radio network temporary identifier, I-RNTI, which may e.g. be used while performing small data transmission with the secondary cell group, for example for a radio access network (RAN) notification area (RNA) of a terminal device, and to receive the configuration response from the secondary node.
  • RAN radio access network
  • RNA radio access network notification area
  • the configuration response may e.g. comprise information on at least one primary secondary cell, PSCell, to be included in the RNA of the terminal device, and information on the SCG SDT I- RNT .
  • the instructions when executed by the at least one processor, further cause the master node to transmit the configuration request when the master node decides to transition the terminal device from radio resource control connected state to radio resource control inactive state.
  • the instructions when executed by the at least one processor, further cause the master node to include the information on the at least one primary secondary cell, PSCell, in the preparation of RNA of the terminal device.
  • the reception of downlink data notification from the secondary node may further cause the master node to page the terminal device in a Paging Occasion of a Paging Cycle configured by the master node, but, for example only, in the PSCells indicated by the secondary node, that belong to the terminal device's RNA.
  • the configuration request may be an RRC Inactive Configuration request.
  • the configuration request may comprise an identifier characterizing the master node, e.g. the gNB acting as the master node.
  • the configuration response may comprise a secondary cell group inactive Radio Network Transaction Identifier, SCG I-RNTI, for example related to an SCG, for example in addition to the information on the at least one PSCell.
  • SCG I-RNTI for master node and secondary node are distinct and may be allocated by the respective nodes.
  • the SCG I-RNTI allocated by the secondary node may use a gNB identifier of the master node to encode a gNB address part of the I-RNTI.
  • the configuration response may comprise an identifier characterizing at least one data radio bearer of the secondary cell group, for example in addition to the information on the at least one PSCell.
  • a radio access network (RAN) notification area (RNA) of a terminal device may be characterized by information on at least one of: primary cell (s) (PCell (s) ) and PSCell (s) .
  • the instructions when executed by the at least one processor, further cause the master node to configure the combined RNA for a terminal device.
  • a list of PSCells may be transmitted from the secondary node to the master node using the configuration response, for example while a respective terminal device, e.g. UE, is sent to an INACTIVE state according to some accepted standard.
  • RNA is a per-UE concept
  • a PSCell list to be included in the RNA may be sent for each UE .
  • the PSCell list may comprise a list of gNBs .
  • the master node may, for example whenever a downlink data notification is received from the secondary node, transmit a corresponding paging message to the terminal device, e.g. to indicate data arrival for a bearer associated with a secondary cell group related to the terminal .
  • the downlink data notification and/or the corresponding paging message to the terminal device may be used for data radio bearers that may be used for small data transmissions.
  • the downlink data notification and/or the corresponding paging message to the terminal device may be used for data radio bearers that are not used for small data transmissions.
  • the UPF may indicate, for example via an additional parameter, for example in a GPRS tunneling protocol (GTP) header related to a quality of service (QoS) flow.
  • GTP GPRS tunneling protocol
  • QoS quality of service
  • a new flag e.g. bit flag, may be added for this.
  • the secondary node may determine, e.g. based on in-band information received from the UPF, that either the SCG bearer should be fully reactivated, the secondary node may for example reserve resources for the reactivation, for example while transmitting the downlink data notification to the master node, or the secondary node is prepared for SCG-SDT with the associated SCG bearer.
  • the secondary node may indicate in the downlink data notification whether the terminal device, e.g. UE, can activate a SCG configuration, for example while sending a RRC resume message, e.g. for the same primary secondary cell, which, in some embodiments, may enable the UE to perform the RRC resume procedure, for example directly, at the secondary node, i.e. without resuming at the master node.
  • the master node may page the terminal device in its radio access network (RAN) notification area (RNA) by transmitting the paging message to the terminal device.
  • the paging message may be used to indicate mobile terminated (MT) secondary cell group (MT-SCG) data or mobile terminated (MT) secondary cell group (MT-SCG) small data transmission (SDT) (MT-SCG-SDT) data .
  • the terminal device may activate the SCG configuration, for example autonomously, for example based on an additional indication in the paging message, e.g. RRC paging message, for MT-SCG data.
  • a SCG-SDT procedure may be triggered directly via the secondary node, e.g. instead of performing an RRC- RESUME via the master node.
  • a secondary cell group small data transmission configuration information is sent from the master node to the terminal device when suspending the terminal device to RRC inactive state.
  • Further exemplary embodiments relate to a method, comprising : receiving, by a master node , from a secondary node , a downlink data noti fication indicating downlink data arrival associated with a secondary cell group data radio bearer, and transmitting, by the master node , a paging message to a terminal device configured with the secondary cell group, the paging message indicating the downlink data arrival associated with the secondary cell group data radio bearer to the terminal device .
  • the master node may page the terminal device in the PSCells of the terminal device ' s RNA, configured for example by the SCG . In some embodiments , the master node may page the terminal device in the paging occasion corresponding to the master node in the paging cycle .
  • FIG. 1 For exemplary embodiments, relate to an apparatus comprising means for causing a master node to receive , from a secondary node , a downlink data noti fication indicating downlink data arrival associated with a secondary cell group data radio bearer, and to transmit a paging message to a terminal device configured with the secondary cell group, the paging message indicating the downlink data arrival associated with the secondary cell group data radio bearer to the terminal device .
  • the secondary node may page the terminal device directly without the involvement of the master node in the PSCells of the terminal device ' s RNA, configured by SCG . In some embodiments , the secondary node may configure the terminal device with a new dedicated paging occasion in the paging cycle of the terminal device , corresponding to the secondary node .
  • FIG. 1 For exemplary embodiments, relate to an apparatus , comprising at least one processor, and at least one memory storing instructions , the at least one memory and the instructions configured to , with the at least one processor, cause a secondary node to perform at least one of : a ) transmit to a master node a downlink data noti fication indicating downlink data arrival associated with a secondary cell group data radio bearer, b ) transmit to a terminal device configured with the secondary cell group a paging message indicating the downlink data arrival associated with the secondary cell group .
  • the instructions when executed by the at least one processor, further cause the secondary node to receive a configuration request from the master node , the configuration request causing the secondary node to provide a configuration response comprising information on at least one primary secondary cell , PSCell , for example to be considered for preparation of an RNA for the terminal device , and, for example , information on a SCG SDT I-RNTI , and to transmit the configuration response to the master node .
  • the instructions when executed by the at least one processor, further cause the secondary node to indicate in the downlink data noti fication whether a terminal device configured with the secondary cell group may activate a secondary cell group configuration, for example when performing RRC resume via the same PSCell of the terminal device in the RRC connected state .
  • the instructions when executed by the at least one processor, further cause the secondary node to receive a resume message from the terminal device configured with the secondary cell group.
  • the secondary node may both transmit the downlink data notification to the master node and transmit the paging message to the terminal device.
  • using both the secondary node and the master node to page the terminal device in a respective secondary cell group paging occasion (s) (SCG-PO) and master cell group paging occasions (MCG-PO) allows load sharing and comparatively quick access.
  • the master node may configure dual paging monitoring for PCell and PSCell, for example with dedicated paging configuration given for Paging Occasion (PO) monitoring in PSCell. In some embodiments, this may be enabled, for example only, when dual layer paging monitoring is enabled for a UE in RRC INACTIVE, e.g. for UE with stored DC configuration for bearer mapping to different cell-groups.
  • dual layer paging monitoring is enabled for a UE in RRC INACTIVE, e.g. for UE with stored DC configuration for bearer mapping to different cell-groups.
  • FIG. 1 For exemplary embodiments, relate to an apparatus comprising means for causing a secondary node to perform at least one of: a) transmit to a master node a downlink data notification indicating downlink data arrival associated with a secondary cell group data radio bearer, b) transmit to a terminal device configured with the secondary cell group a paging message indicating the downlink data arrival associated with the secondary cell group.
  • FIG. 1 For exemplary embodiments, relate to an apparatus, comprising at least one processor, and at least one memory storing instructions, the at least one memory and the instructions configured to, with the at least one processor, cause a terminal device, e.g. UE, to receive at least one paging message indicating downlink data arrival for a secondary cell group associated with the terminal device, and to perform a resume procedure with a secondary node of the secondary cell group based on the at least one paging message.
  • a terminal device e.g. UE
  • the terminal device may activate the SCG configuration, for example autonomously, for example based on an additional indication in the paging message, e.g. RRC paging message, for MT-SCG data.
  • a SCG-SDT procedure may be triggered directly via the secondary node , e . g . instead of performing an RRC-RESUME via the master node .
  • the instructions when executed by the at least one processor, further cause the terminal device to transmit payload, for example an SDT payload, within a resume message , for example directly, to the secondary node , for example without performing resume with the master node .
  • payload for example an SDT payload
  • the terminal device or UE may transmit at least one of the following elements with the resume message : a ) the optional payload, b ) an identi bomb of the UE related to SDT associated with the SCG ( SCG-SDT UE ID) , an identi bomb characteri zing at least one data radio bearer .
  • Further exemplary embodiments relate to an apparatus comprising means for causing a terminal device to receive at least one paging message indicating downlink data arrival for a secondary cell group associated with the terminal device , and to perform a resume procedure with a secondary node of the secondary cell group based on the at least one paging message . Further exemplary embodiments relate to a wireless communications system comprising at least one apparatus according to the embodiments.
  • Fig. 1 schematically depicts a simplified block diagram according to some embodiments
  • Fig. 2 schematically depicts a simplified block diagram according to some embodiments
  • Fig. 3 schematically depicts a simplified block diagram according to some embodiments
  • Fig. 4 schematically depicts a simplified block diagram according to some embodiments
  • Fig. 5 schematically depicts a simplified flow chart according to some embodiments
  • Fig. 6 schematically depicts a simplified flow chart according to some embodiments
  • Fig. 7 schematically depicts a simplified flow chart according to some embodiments.
  • Fig. 8 schematically depicts a simplified flow chart according to some embodiments.
  • Fig. 9 schematically depicts a simplified flow chart according to some embodiments.
  • Fig. 10 schematically depicts an exemplary signaling diagram according to some embodiments
  • Fig. 11 schematically depicts an exemplary signaling diagram according to some embodiments
  • Fig. 12 schematically depicts an exemplary signaling diagram according to some embodiments
  • Fig. 13 schematically depicts a simplified block diagram according to some embodiments
  • Fig. 14 schematically depicts a simplified block diagram according to some embodiments.
  • Fig. 15 schematically depicts a simplified block diagram according to some embodiments.
  • Fig. 16 schematically depicts a simplified block diagram according to some embodiments.
  • Fig. 17 schematically depicts a simplified block diagram according to some embodiments.
  • Fig. 1, 4, 5 relate to an apparatus 100 comprising at least one processor 102, and at least one memory 104 storing instructions 106, the at least one memory 104 and the instructions 106 configured to, with the at least one processor 102, cause a master node 10 (Fig. 4) to receive 404 (Fig. 5) , from a secondary node 20 (Fig.
  • a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 or a respective data radio bearer and to transmit 406 a paging message PM-MN to a terminal device 30 configured with the secondary cell group SCG-20, the paging message PM-MN indicating the downlink data arrival associated with the secondary cell group SCG-20 data radio bearer to the terminal device 30.
  • the apparatus 100 may be an apparatus for a wireless communications system 1 (Fig. 4) .
  • the apparatus 100 or its functionality, respectively, may be provided in a base station, for example gNB, 10 of the communications system 1.
  • the downlink data notification DLDN may be transmitted from the secondary node 20 to the master node 10 using an Xn interface according to some accepted standards .
  • the paging message PM-MN is a radio resource control (RRC) paging message, for example according to some accepted standards.
  • RRC radio resource control
  • the apparatus 100 may be used for or within wireless communications systems 1, e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as 5G (fifth generation) or other radio access technology.
  • wireless communications systems e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as 5G (fifth generation) or other radio access technology.
  • 3GPP third generation partnership project
  • radio standards such as 5G (fifth generation) or other radio access technology.
  • the apparatus 100 may be used for a distributed NR gNB with an NR-DC bearer configuration with central unit (CU) - distributed unit (DU) architecture, as exemplarily depicted by Fig. 16, 17 in terms of a disaggregated gNB architecture and a centralized architecture.
  • Block 10' of Fig. 16 symbolizes a first gNB acting as a master node, e.g. similar to element 10 of Fig. 4.
  • Block 20' of Fig. 16 symbolizes a second gNB acting as a secondary node, e.g. similar to element 20 of Fig. 4.
  • Block 30' of Fig. 16 symbolizes a terminal device capable of NR- DC, e.g. similar to element 30 of Fig. 4.
  • Block 40a of Fig. 16 symbolizes a first user plane function, UPF, and block 40b of Fig. 16 symbolizes a second user plane function.
  • Block 50 of Fig. 16 symbolizes an exemplary access and mobility management function, AMF.
  • Block Bl of Fig. 17 symbolizes a control plane, CP, of a central unit, CU, of a gNB which may act as a master node and/or secondary node
  • block B2 symbolizes a user plane, UP, of the central unit of the gNB
  • block B3 symbolizes a distributed unit, DU, of a gNB associated with a master cell group
  • block B4 symbolizes a distributed unit of a gNB associated with a secondary cell group.
  • a central unit control plane (CU-CP) Bl (Fig. 17) may assume roles of both a master node and secondary node logical entity.
  • a master cell group distributed unit, MCG-DU, B3 and a secondary cell group distributed unit, SCG-DU, B4 may host for example two data radio bearers, DRBs, DRB1, DRB2 belonging to two different protocol data unit, PDU, sessions, which may for example be offered by two different user plane functions, UPFs, 40a, 40b, for example of a core network, CN.
  • a terminal device 30' such as a user equipment, UE
  • the NR-DC for the UE 30' is not involving a split bearer, but for example offering two different services, e.g. : Service 1 via the MCG-DU B3 (Fig. 17) in a first frequency range, for example FR1 according to some accepted standards, and Service 2 via the SCG-DU B4 in a second frequency range different from the first frequency range, for example FR2 according to some accepted standards .
  • the use case characterized by aspects a) , b) , c) above may motivate to provide small data transmission, SDT, for example without radio resource control connection establishment, for a terminal device, e.g. UE, 30' with NR-DC.
  • SDT small data transmission
  • some SCG bearers for example in the second frequency range FR2, may not be able to be reconfigured as MCG bearers, if SDT is expected of those bearers.
  • SDT may be used for application scenarios where a UE 30, 30' needs to send for example only a single packet of uplink transmission data, for example from a battery efficient state such as e.g. a radio resource control, RRC, idle or inactive state according to some accepted standards (RRC-IDLE/RRC-INACTIVE) .
  • a battery efficient state such as e.g. a radio resource control, RRC, idle or inactive state according to some accepted standards (RRC-IDLE/RRC-INACTIVE) .
  • a terminal device e.g. UE, 30, 30' may store a configuration CFG (Fig. 4) of a last (e.g., preceding) RRC connection, for example along with bearer configurations, for example associated with both the MCG and the SCG.
  • a network can resume to dual connectivity, DC, for example NR-DC, in a comparatively short time with a comparatively lesser signaling overhead.
  • DC for example NR-DC
  • the principle according to the embodiments may e.g. be used for terminal devices 30, 30' such as UE having dual connectivity in RRC-CONNECTED state, which are transitioned to an RRC inactive state according to some accepted standards, e.g. RRC-INACTIVE, wherein the UE 30, 30' may preserve the UE context, which may e.g. include higher layer configurations, user plane tunnel information and bearer mapping for SCG in RRC-INACTIVE state, but may e.g. only release a physical layer resource.
  • the configurations e.g. UE context
  • the principle according to the embodiments may e.g. be used for enabling SDT related with SCG, SCG-SDT, e.g. for UE with NR-DC configuration in RRC INACTIVE state.
  • an efficient paging procedure for UEs 30, 30' in such configuration is provided, for example avoiding paging in cells of several, for example all, frequency layers, whereas the bearers are configured for specific cells of frequency layer.
  • a quick resume e.g. to an RRC connected state according to some accepted standards, may also be provided.
  • a reception of downlink, DL, data may occur at a central unit user plane, CU-UP, of a master node 10 (Fig. 4) or a secondary node 20, e.g. depending on whether the downlink data belongs to a data radio bearer of the MCG or of the SCG SCG-20.
  • the situation of received DL data for an SCG DRB for example at a central unit user plane of the secondary node (s-CU-UP) , is considered.
  • the instructions 106 when executed by the at least one processor 102, further cause the master node 10 to transmit 400 a configuration request CFG-REQ to the secondary node 20, the configuration request CFG-REQ causing the secondary node 20 to provide a configuration response CFG-RESP comprising information on at least one primary secondary cell, PSCell, for example for a radio access network (RAN) notification area (RNA) of a terminal device 30, and to receive 402 the configuration response CFG-RESP from the secondary node 20.
  • RAN radio access network
  • RNA radio access network
  • the instructions 106 when executed by the at least one processor 102, further cause the master node 10 (Fig. 4) to include the information on the at least one primary secondary cell, PSCell, in the preparation of RNA of the terminal device 30.
  • the reception of downlink data notification from the secondary node 20 may further cause the master node 10 to page the terminal device 30 in a Paging Occasion of a Paging Cycle configured by the master node 10, but, for example only, in the PSCells indicated by the secondary node 20, that belong to the terminal device's RNA.
  • the configuration request CFG-REQ may be an RRC Inactive Configuration request.
  • the configuration request CFG-REQ may comprise an identifier (for example, MN-gNB-ID) characterizing the master node, e.g. the gNB acting as the master node.
  • the configuration response CFG-RESP may comprise a secondary cell group inactive Radio Network Transaction Identifier, SCG I-RNTI, for example related to an SCG, for example in addition to the information on the at least one PSCell.
  • SCG I-RNTI Radio Network Transaction Identifier
  • I-RNTI for master node 10 and secondary node 20 are distinct and may be allocated by the respective nodes 10, 20.
  • the SCG I-RNTI allocated by the secondary node 20 may use a gNB identifier of the master node 10 to encode a gNB address part of the I-RNTI.
  • the configuration response CFG-RESP may comprise an identifier characterizing at least one data radio bearer of the secondary cell group SCG-20 (Fig. 4) , for example in addition to the information on the at least one PSCell.
  • a radio access network (RAN) notification area (RNA) of the terminal device 30 may be characterized by information on at least one of: primary cell (s) (PCell (s) ) and PSCell (s) .
  • a list of PSCells may be transmitted from the secondary node 20 to the master node 10 using the configuration response CFG-RESP (Fig. 5) , for example while a respective terminal device, e.g. UE, 30 is sent to an INACTIVE state according to some accepted standard.
  • a PSCell list to be included in the RNA may be sent for each UE 30.
  • the PSCell list may comprise a list of gNBs .
  • the master node 10 may, for example whenever a downlink data notification DLDN is received from the secondary node 20, transmit a corresponding paging message PM-MN to the terminal device 30, e.g. to indicate data arrival for a bearer associated with a secondary cell group SCG-20 related to the terminal 30.
  • the downlink data notification DLDN and/or the corresponding paging message PM-MN to the terminal device may be used for data radio bearers that may be used for small data transmissions, SDT.
  • the downlink data notification DLDN and/or the corresponding paging message PM-MN to the terminal device 30 may be used for data radio bearers that are not used for small data transmissions.
  • the UPF may indicate, for example via an additional parameter, for example in a GPRS tunneling protocol (GTP) header related to a quality of service (QoS) flow.
  • GTP GPRS tunneling protocol
  • QoS quality of service
  • a new flag e.g. bit flag, may be added for this.
  • the secondary node 20 may determine, e.g. based on in-band information received from the UPF, that either the SCG bearer should be, for example fully, reactivated, the secondary node 20 may for example reserve resources for the reactivation, for example while transmitting the downlink data notification DLDN to the master node 10, or the secondary node 20 is prepared for SCG-SDT with the associated SCG bearer.
  • the secondary node 20 may indicate in the downlink data notification DLDN whether the terminal device, e.g. UE, 30 can activate a SCG configuration, for example while sending a RRC resume message, e.g. for the same primary secondary cell, which, in some embodiments, may enable the UE 30 to perform the RRC resume procedure, for example directly, at the secondary node 20, i.e. without resuming at the master node 10.
  • the master node 10 may page the terminal device 30 in its radio access network (RAN) notification area (RNA) by transmitting the paging message PM-MN to the terminal device 30.
  • the paging message PM-MN may be used to indicate mobile terminated (MT) secondary cell group (MT-SCG) data or mobile terminated (MT) secondary cell group (MT-SCG) small data transmission (SDT) (MT-SCG-SDT) data.
  • the terminal device 30 may activate the SCG configuration, for example autonomously, for example based on an additional indication in the paging message PM-MN, e.g. RRC paging message, for MT-SCG data.
  • a SCG-SDT procedure may be triggered directly via the secondary node 20, e.g. instead of performing an RRC-RESUME via the master node 10.
  • Fig. 5 relate to a method, comprising: receiving 404, by a master node 10, from a secondary node 20, a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, and transmitting 406, by the master node 10, a paging message PM-MN to a terminal device 30 configured with the secondary cell group SCG-20, the paging message PM-MN indicating the downlink data arrival associated with the secondary cell group SCG-20 to the terminal device 30.
  • the master node 10 may page the terminal device in the PSCells of the terminal device's RNA, configured for example by the SCG.
  • the master node may page the terminal device in the paging occasion corresponding to the master node in the paging cycle .
  • Fig. 13 relate to an apparatus 100' comprising means 102' for causing a master node 10 to receive 404, from a secondary node 20, a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, and to transmit 406 a paging message PM-MN to a terminal device 30 configured with the secondary cell group SCG-20, the paging message PM-MN indicating the downlink data arrival associated with the secondary cell group SCG-20 to the terminal device 30.
  • the secondary node 20 may page the terminal device 30 directly without the involvement of the master node 10 in the PSCells of the terminal device's RNA, configured by SCG.
  • the secondary node 20 may configure the terminal device 30 with a new dedicated paging occasion in the paging cycle of the terminal device 30, corresponding to the secondary node 20.
  • the means 102' may e.g. comprise at least one processor 102 (Fig. 1) , and at least one memory 104 storing instructions 106, wherein e.g. the at least one memory 104 and the instructions 106 are configured to, with the at least one processor 102, perform aspects and/or steps of the method according to the embodiments.
  • Fig. 2, 4, 6, 7, relate to an apparatus 200, comprising at least one processor 202, and at least one memory 204 storing instructions 206, the at least one memory 204 and the instructions 206 configured to, with the at least one processor 202, cause a secondary node 20 (Fig. 4) to perform at least one of: a) transmit 456 (Fig. 6) to a master node 10 a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, b) transmit 458 (Fig. 7) to a terminal device 30 configured with the secondary cell group SCG-20 a paging message PM-SN indicating the downlink data arrival associated with the secondary cell group SCG-20.
  • a secondary node 20 (Fig. 4) to perform at least one of: a) transmit 456 (Fig. 6) to a master node 10 a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, b) transmit 458 (Fig
  • Optional block 454 of Fig. 6 symbolizes an arrival of downlink data DLD at the secondary node 20, which in some embodiments may trigger the transmitting block 456.
  • the secondary node 20 may transmit 458 the paging message PM-SN to the terminal device upon receipt 454 of the downlink data DLD.
  • the secondary node 20 may both transmit 456 the downlink data notification DLDN to the master node 10 and transmit 458 the paging message PM-SN to the terminal device 30, e.g. upon receipt 454 of the downlink data DLD.
  • the instructions 206 when executed by the at least one processor 202, further cause the secondary node 20 to receive 450 a configuration request CFG-REQ from the master node 10, the configuration request CFG-REQ causing the secondary node 20 to provide a configuration response CFG-RESP comprising information on at least one primary secondary cell, PSCell, and to transmit 452 the configuration response to the master node 10.
  • the instructions 206 when executed by the at least one processor 202, further cause the secondary node 20 to indicate 460 in the downlink data notification DLDN whether a terminal device 30 configured with the secondary cell group SCG-20 may activate a secondary cell group configuration.
  • the instructions 206 when executed by the at least one processor 202, further cause the secondary node 20 to receive 462 a resume message RES from the terminal device 30 configured with the secondary cell group SCG-20.
  • Fig. 6, 7 relate to a method comprising at least one of: a) transmitting 456, by a secondary node 20, to a master node 10 a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, b) transmitting 458, by the secondary node 20, to a terminal device 30 configured with the secondary cell group SCG-20 a paging message PM-SN indicating the downlink data arrival associated with the secondary cell group SCG-20.
  • This enables to notify the master node 10 of the downlink data, e.g. for causing the master node 10 to transmit a paging message PM-MN (Fig.
  • Fig. 14 relate to an apparatus 200' comprising means 202' for causing a secondary node 20 to perform at least one of: a) transmit 456 to a master node 10 a downlink data notification DLDN indicating downlink data arrival associated with a secondary cell group SCG-20 data radio bearer, b) transmit 458 to a terminal device 30 configured with the secondary cell group SCG-20 a paging message PM-SN indicating the downlink data arrival associated with the secondary cell group SCG-20 data radio bearer.
  • the means 202' may e.g. comprise at least one processor 202 (Fig. 2) , and at least one memory 204 storing instructions 206, wherein e.g. the at least one memory 204 and the instructions 206 are configured to, with the at least one processor 202, perform aspects and/or steps of the method according to the embodiments.
  • Fig. 3, 4, 9 relate to an apparatus 300, comprising at least one processor 302, and at least one memory 304 storing instructions 306, the at least one memory 304 and the instructions 306 configured to, with the at least one processor 302, cause a terminal device, e.g. UE, 30 to receive 470 (Fig. 9) at least one paging message PM-MN, PM-SN indicating downlink data arrival for a secondary cell group SCG-20 associated with the terminal device 30, and to perform 472 a resume procedure with a secondary node 20 of the secondary cell group SCG-20 based on the at least one paging message PM- MN, PM-SN.
  • the terminal device 30 may activate the SCG configuration, for example autonomously, for example based on an additional indication in the paging message PM-MN, PM-SN, e.g. RRC paging message, for MT-SCG data.
  • a SCG-SDT procedure may be triggered directly via the secondary node 20, e.g. instead of performing an RRC-RESUME via the master node 10.
  • payload PL for example an SDT payload
  • the terminal device or UE 30, respectively may transmit 474 at least one of the following elements with the resume message: a) the optional payload PL, b) an identifier of the UE 30 related to SDT associated with the SCG (SCG-SDT UE ID) , an identifier characterizing at least one data radio bearer.
  • Fig. 9 relate to a method, comprising: receiving 470, by a terminal device 30, at least one paging message PM-MN, PM-SN indicating downlink data arrival for a secondary cell group SCG-20 associated with the terminal device 30, and performing 472 a resume procedure with a secondary node 20 of the secondary cell group SCG-20 based on the at least one paging message PM- MN, PM-SN.
  • Fig. 15 relate to an apparatus 300' comprising means 302' for causing a terminal device 30 to receive 470 at least one paging message PM-MN, PM-SN indicating downlink data arrival for a secondary cell group SCG-20 associated with the terminal device 30, and to perform 472 a resume procedure with a secondary node 20 of the secondary cell group SCG-20 based on the at least one paging message PM-MN, PM-SN.
  • the means 302' may e.g. comprise at least one processor 302 (Fig. 3) , and at least one memory 304 storing instructions 306, wherein e.g. the at least one memory 304 and the instructions 306 are configured to, with the at least one processor 302, perform aspects and/or steps of the method according to the embodiments.
  • FIG. 4 Further exemplary embodiments relate to a wireless communications system 1 (Fig. 4) comprising at least one apparatus according to the embodiments.
  • Elements 10, 20, 30 of Fig. 10 correspond with elements 10, 20, 30 of Fig. 4 explained above, and element 40 of Fig. 10 symbolizes a user plane function, which may, for example at some time, provide downlink data.
  • Double arrow el symbolizes a NR-DC involving the UE 30, the master node 10 and the secondary node 20.
  • Element e2 symbolizes the UE 30 being in a connected state, for example an RRC CONNECTED state according to some accepted standard.
  • Element e3 symbolizes the master node 10 transmitting a configuration request (e.g., similar to block 400 of Fig. 5) to the secondary node 20.
  • Element e4 symbolizes the secondary node 20 preparing for a small data transmission (SDT) related to the secondary cell group SCG- 20 (Fig. 4) .
  • Element e5 symbolizes the secondary node 20 transmitting a configuration response to the master node 10.
  • Element e6 symbolizes the master node gNB 10 deciding to move the UE 30 to an inactive state, for example an RRC INACTIVE state according to some accepted standard.
  • Element e7 symbolizes a corresponding RRC Release message with suspend config being transmitted from the master node 10 to the UE 30.
  • Element e8 symbolizes the UE 30 assuming an RRC INACTIVE state.
  • Element e9 symbolizes incoming downlink data from the UPF 40 to the secondary node 20.
  • Element elO symbolizes the secondary node 20 initiating a paging of the UE 30 via the master node 10.
  • Element ell symbolizes the secondary node 20 transmitting a corresponding downlink data notification to the master node 10
  • element el2 symbolizes a paging message transmitted from the master node 10 in a respective paging occasion upon receipt of the downlink data notification ell from the secondary node 20, the paging message el2 e.g. comprising PSCells of the RNA of the UE 30.
  • Element el3 symbolizes the UE 30 performing a resume procedure based on the paging message el2, e.g. directly with the secondary node 20.
  • Element el4 symbolizes the secondary node 20 moving the UE 30 to an RRC CONNECTED mode or back to an RRC INACTIVE mode according to some accepted standard, e.g. depending on a buffer status (report) of the UE 30.
  • Fig. 10 While the exemplary process of Fig. 10 explained above can be considered as paging the UE 30 for a SCG-DRB via the master node 10 (see the paging message el2) , the exemplary process of Fig. 11 provides a paging of the UE via the secondary node 20.
  • Elements el, e2, e3, e4, e5, e6, e7, e8, e9 of Fig. 11 correspond with elements el, e2, e3, e4, e5, e6, e7, e8, e9 of Fig. 10.
  • Element e20 of Fig. 11 symbolizes the secondary node 20 initiating a paging of the UE 30, e.g. directly, via the secondary node 20.
  • Element e21 symbolizes the secondary node 20 transmitting a paging message (e.g. comprising PSCells of the RNA of the UE 30) in a respective paging occasion upon receipt of the downlink data e9 to the UE 30.
  • Element e22 symbolizes the UE 30 performing a resume procedure based on the paging message e21, e.g. directly with the secondary node 20.
  • Element e23 symbolizes the secondary node 20 moving the UE 30 to an RRC CONNECTED mode or back to an RRC INACTIVE mode according to some accepted standard, e.g. depending on a buffer status (report) of the UE 30.
  • Fig. 12 provides a paging of the UE 30 both via the master node 10 and via the secondary node 20.
  • Elements el, e2, e3, e4, e5, e6, e7, e8, e9 of Fig. 12 correspond with elements el, e2, e3, e4, e5, e6, e7, e8, e9 of Fig. 10, 11.
  • Element e30 of Fig. 12 symbolizes the secondary node 20 initiating a paging of the UE 30, e.g. directly, e.g. via the secondary node 20, and via the master node 10.
  • Element e31 symbolizes the secondary node 20 transmitting a downlink data notification to the master node 10, e.g. to cause the master node 10 to transmit a paging message e33 to the UE 30.
  • Element e32 symbolizes the secondary node 20 transmitting a paging message (e.g. comprising PSCells of the RNA of the UE 30) in a respective paging occasion to the UE 30.
  • Element e33 symbolizes the master node 10 transmitting a paging message (e.g.
  • Element e34 symbolizes the UE 30 performing a resume procedure based on at least one of the paging messages e32, e33, e.g. directly with the secondary node 20.
  • Element e35 symbolizes the secondary node 20 moving the UE 30 to an RRC CONNECTED mode or back to an RRC INACTIVE mode according to some accepted standard, e.g. depending on a buffer status (report) of the UE 30.
  • using both the secondary node 20 and the master node 10 to page the UE 30 in respective secondary cell group paging occasion (s) (SCG-PO) and master cell group paging occasions (MCG-PO) allows load sharing and comparatively quick access.
  • the master node 10 may configure dual paging monitoring for PCell and PSCell, for example with dedicated paging configuration given for Paging Occasion (PO) monitoring in PSCell. In some embodiments, this may be enabled, for example only, when dual layer paging monitoring is enabled for a UE 30 in RRC INACTIVE, e.g. for UE 30 with stored DC configuration for bearer mapping to different cell-groups.
  • dual layer paging monitoring is enabled for a UE 30 in RRC INACTIVE, e.g. for UE 30 with stored DC configuration for bearer mapping to different cell-groups.
  • this enables to use two paging occasions in one paging cycle, the two paging occasions having a certain offset.
  • the terminal device or UE 30 may be configured to monitor two paging occasions in one paging cycle, one paging occasion belonging to master node 10 and the other paging occasion belonging to the secondary node 20.
  • the paging occasion belonging to the secondary node 20 may be communicated in the configuration response sent by secondary node 20 to the master node 10.
  • the UE 30 may monitor a paging occasion in that PSCell which has better quality.
  • both the secondary node 20 and the master node 10 may initiate paging.
  • the master node 10 may page the UE 30 in the primary cells (PCells) of the RNA, and the secondary node 20 may page the
  • the master node 10 and the secondary node 20 share a cell load while paging, i.e. they do not page in each other's cells.
  • the UE 30 may activate dual RX for dual paging monitoring in RRC-INACTIVE state.
  • the S-CU-UP can deliver a paging message directly via its paging channel when it gets data from UPF 40.
  • the secondary node 20 may trigger the paging via the master node 10, e.g. for paging retransmissions .
  • the secondary node 20 directly paging in SCG cells may provide fast resume (s) , which may e.g. be useful in mobile terminated small data transmissions in a downlink direction.

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

Abstract

L'invention concerne un appareil, comprenant au moins un processeur, et au moins une mémoire stockant des instructions, la ou les mémoires et les instructions étant configurées pour, avec le ou les processeurs, faire en sorte qu'un nœud maître reçoive, d'un nœud secondaire, une notification de données de liaison descendante indiquant l'arrivée de données de liaison descendante associées à un support radio de données de groupe de cellules secondaires, et pour transmettre un message de recherche à un dispositif terminal configuré avec le groupe de cellules secondaires, le message de recherche indiquant l'arrivée de données de liaison descendante associées au support radio de données de groupe de cellules secondaires au dispositif terminal.
PCT/EP2022/072958 2021-09-06 2022-08-17 Procédés et appareils de radiomessagerie d'un terminal Ceased WO2023030887A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
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WO2025053641A1 (fr) * 2023-09-07 2025-03-13 엘지전자 주식회사 Dispositif et procédé de transmission de petites données dans un système de communications sans fil

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WO2019027296A1 (fr) * 2017-08-04 2019-02-07 Lg Electronics Inc. Procédé d'exécution d'une radiomessagerie fondée sur ran et dispositif prenant en charge ledit procédé
EP3796744A1 (fr) * 2018-06-21 2021-03-24 Samsung Electronics Co., Ltd. Procédé et appareil permettant de prendre en charge une double connexion de mode d'inactivation rrc dans un système de communication mobile de prochaine génération
EP3833099A1 (fr) * 2018-08-15 2021-06-09 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé et appareil destinés à récupérer une connexion rrc, et terminal
WO2021163394A1 (fr) * 2020-02-13 2021-08-19 Ofinno, Llc Transmission de petites données (sdt)

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Publication number Priority date Publication date Assignee Title
WO2019027296A1 (fr) * 2017-08-04 2019-02-07 Lg Electronics Inc. Procédé d'exécution d'une radiomessagerie fondée sur ran et dispositif prenant en charge ledit procédé
EP3796744A1 (fr) * 2018-06-21 2021-03-24 Samsung Electronics Co., Ltd. Procédé et appareil permettant de prendre en charge une double connexion de mode d'inactivation rrc dans un système de communication mobile de prochaine génération
EP3833099A1 (fr) * 2018-08-15 2021-06-09 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé et appareil destinés à récupérer une connexion rrc, et terminal
WO2021163394A1 (fr) * 2020-02-13 2021-08-19 Ofinno, Llc Transmission de petites données (sdt)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025053641A1 (fr) * 2023-09-07 2025-03-13 엘지전자 주식회사 Dispositif et procédé de transmission de petites données dans un système de communications sans fil

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