WO2022028918A1 - Transfert intercellulaire conditionnel - Google Patents

Transfert intercellulaire conditionnel Download PDF

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Publication number
WO2022028918A1
WO2022028918A1 PCT/EP2021/070622 EP2021070622W WO2022028918A1 WO 2022028918 A1 WO2022028918 A1 WO 2022028918A1 EP 2021070622 W EP2021070622 W EP 2021070622W WO 2022028918 A1 WO2022028918 A1 WO 2022028918A1
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WO
WIPO (PCT)
Prior art keywords
primary
secondary cell
addition
cell
enabling
Prior art date
Application number
PCT/EP2021/070622
Other languages
English (en)
Inventor
Srinivasan Selvaganapathy
Amaanat ALI
Ahmad AWADA
Tero Henttonen
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to EP21748881.6A priority Critical patent/EP4193667A1/fr
Publication of WO2022028918A1 publication Critical patent/WO2022028918A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • Embodiments of the present disclosure relate to conditional handover. Some relate to conditional handover with dual connectivity configuration.
  • a wireless network comprises a plurality of network nodes including terminal nodes and access nodes. Communication between the terminal nodes and access nodes is wireless.
  • an apparatus comprising means for: enabling conditional handover with delayed dual connectivity by: receiving configuration information comprising at least a handover execution condition for a primary cell and an addition condition for a primary secondary cell; determining whether the handover execution condition for the primary cell is satisfied and whether the addition condition for the primary secondary cell is satisfied; and if it is determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the means are configured to, if it is determined at a later time that the addition condition for the primary secondary cell is satisfied, enable completion of conditional addition of the primary secondary cell for dual connectivity.
  • enabling the completion of conditional handover and the completion of the conditional addition comprises establishing an active radio link.
  • the completion of conditional handover to the primary cell is enabled, without enabling the completion of conditional addition to the primary secondary cell for dual connectivity, after a timeout period has expired after the handover execution condition for the primary cell is satisfied.
  • the means are configured to receive the timeout period value.
  • the means are configured to cause transmission, to a network node, of information configured to provide an indication of the primary secondary cell conditional addition status.
  • the indication of the primary secondary cell conditional addition status comprises at least one of: an indication that the addition condition for the primary secondary cell is not yet satisfied; an indication that an active radio link with the primary secondary cell is not yet established; and where a timeout period is used, a value of a timeout period timer.
  • the handover execution condition for the primary cell is A3 condition and/or the addition condition for the primary secondary cell is A4 condition.
  • the means are configured to cause transmission of information indicative of one or more measurement results of the primary secondary cell.
  • the configuration information comprises: configuration information for handover to the primary cell; and configuration information for enabling the delayed dual connectivity with the primary secondary cell.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • a method comprising: enabling conditional handover with delayed dual connectivity by: receiving configuration information comprising at least a handover execution condition for a primary cell and an addition condition for a primary secondary cell; determining whether the handover execution condition for the primary cell is satisfied and whether the addition condition for the primary secondary cell is satisfied; and if it is determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the method comprises, if it is determined at a later time that the addition condition for the primary secondary cell is satisfied, enabling completion of conditional addition of the primary secondary cell for dual connectivity.
  • enabling the completion of conditional handover and the completion of conditional addition comprises establishing an active radio link.
  • the completion of conditional handover to the primary cell is enabled, without enabling the completion of conditional addition to the primary secondary cell for dual connectivity, after a timeout period has expired after the handover execution condition for the primary cell is satisfied.
  • the method comprises receiving the timeout period value.
  • the method comprises causing transmission, to a network node, of information configured to provide an indication of the primary secondary cell conditional addition status.
  • the indication of the primary secondary cell conditional addition status comprises at least one of: an indication that the addition condition for the primary secondary cell is not yet satisfied; an indication that an active radio link with the primary secondary cell is not yet established; and where a timeout period is used, a value of a timeout period timer.
  • the handover execution condition for the primary cell is A3 condition and/or the addition condition for the primary secondary cell is A4 condition.
  • the method comprises causing transmission of information indicative of one or more measurement results of the primary secondary cell.
  • the configuration information comprises: configuration information for handover to the primary cell; and configuration information for enabling the delayed dual connectivity with the primary secondary cell.
  • a computer program comprising instructions for causing an apparatus to perform at least the following: enabling conditional handover with delayed dual connectivity by: receiving configuration information comprising at least a handover execution condition for a primary cell and an addition condition for a primary secondary cell; determining whether the handover execution condition for the primary cell is satisfied and whether the addition condition for the primary secondary cell is satisfied; and if it is determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • a computer program comprising instructions for causing an apparatus to perform at least a part of one or more methods as disclosed herein.
  • an apparatus comprising means for: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: causing transmission of configuration information comprising at least: a handover execution condition for a primary cell for enabling conditional handover to the primary cell; an addition condition for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE that the UE has determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition of the primary secondary cell for dual connectivity.
  • the means are configured to enable the completion of conditional handover to the primary cell without dual connectivity to the primary secondary cell and enable initiation, but not completion, of addition with dual connectivity to the primary secondary cell.
  • enabling the completion of conditional handover to the primary cell and/or enabling the delay of addition of the primary secondary cell for dual connectivity comprises remapping bearers.
  • the means are configured to inform a target secondary node that the UE is not yet available.
  • the configuration information comprises a timeout period value.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • a method comprising: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: causing transmission of configuration information comprising at least: a handover execution condition for a primary cell for enabling conditional handover to the primary cell; an addition condition for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE that the UE has determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition to the primary secondary cell for dual connectivity.
  • the method comprises enabling the completion of conditional handover to the primary cell without dual connectivity to the primary secondary cell and enable initiation, but not completion, of addition with dual connectivity to the primary secondary cell.
  • enabling the completion of conditional handover to the primary cell and/or enabling the delay of addition of the primary secondary cell for dual connectivity comprises remapping bearers.
  • the method comprises informing a target secondary node that the UE is not yet available.
  • a computer program comprising instructions for causing an apparatus to perform at least the following: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: transmitting configuration information comprising at least: a handover execution condition for a primary cell for enabling conditional handover to the primary cell; an addition condition for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE that the UE has determined that the handover execution condition for the primary cell is satisfied but the addition condition for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition to of the primary secondary cell for dual connectivity.
  • an apparatus comprising means for: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: receiving an indication that an addition condition for a primary secondary cell is not satisfied; and maintaining resources for the UE for later enabling addition of the primary secondary cell for dual connectivity at the UE, when the addition condition for the primary secondary cell is satisfied.
  • the means are configured to subsequently enable completion of addition of the primary secondary cell for dual connectivity.
  • the means are configured to inform a master node that addition of the primary secondary cell for dual connectivity has been completed.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • a method comprising: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: receiving an indication that an addition condition for a primary secondary cell is not satisfied; and maintaining resources for the UE for later enabling addition of the primary secondary cell for dual connectivity at the UE, when the addition condition for the primary secondary cell is satisfied.
  • a computer program comprising instructions for causing an apparatus to perform at least the following: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: receiving an indication that an addition condition for a primary secondary cell is not satisfied; and maintaining resources for the UE for later enabling addition of the primary secondary cell for dual connectivity at the UE, when the addition condition for the primary secondary cell is satisfied.
  • FIG. 1 shows an example of the subject matter described herein
  • FIG. 2 shows another example of the subject matter described herein
  • FIG. 3 shows another example of the subject matter described herein
  • FIG. 4 shows another example of the subject matter described herein
  • FIG. 5 shows another example of the subject matter described herein
  • FIG. 6 shows another example of the subject matter described herein
  • FIG. 7 shows another example of the subject matter described herein
  • FIG. 8A shows another example of the subject matter described herein.
  • FIG. 8B shows another example of the subject matter described herein.
  • MN Master Node
  • MCG Master Cell Group
  • Secondary Node Network node that is providing additional radio resources for the UE but is not the MN.
  • Secondary Cell Group SCG: Group of cells associated with the SN, includes PSCell.
  • PCell the cell for uplink/downlink connection to MN.
  • Cell of MCG used to initiate initial access to the MN.
  • PSCell the cell for uplink/downlink connection to SN.
  • Cell of SCG used to initiate initial access to the SN.
  • Conditional Handover (CHO) - a handover procedure that is triggered by the UE only when the configured execution condition(s) are met for a candidate cell. Condition(s) preconfigured by network.
  • a conditional handover execution condition is specified by condExecutionCond within the CondReconfigToAddModList information element within the ConditionalReconfiguration information element within an RRCReconfiguration message.
  • UE has contemporaneous connection to an MN and an SN. This is a mode of operation of a UE in RRC_CONNECTED, configured with a Master Cell Group and a Secondary Cell Group.
  • the configuration information can, for example, be provided in an RRCReconfiguration message.
  • configuration information comprising and entity (for example handover execution condition for a primary cell; addition condition for dual connectivity with the primary cell and so on) can mean that the configuration information comprises information sufficient to obtain the entity. It may or may not comprise all parameters of the entity, it may instead comprise pointer to the entity or parameters of the entity or can mean that configuration includes the entity.
  • the CHO configuration information can comprise a handover execution condition for a primary cell and a measurement configuration for configuring measurements for a handover execution condition for the primary cell. Triggering conditional handover to the primary cell is dependent upon the measurements meeting the handover execution condition for the primary cell.
  • a RRCReconfiguration message specifies a ConditionalReconfiguration information element which provides the CHO configuration.
  • the ConditionalReconfiguration information element comprises a CondReconfigToAddModList information element.
  • the CondReconfigToAddModList information element comprises condExecutionCond and condRRCReconfig. Handover execution condition(s) for a primary cell are specified by condExecutionCond.
  • the RRCReconfiguration message to be applied when the specified conditions are met is provided by condRRCReconfig.
  • the DC configuration information can comprise an addition condition for a primary secondary cell for dual connectivity with the primary cell and a measurement configuration for configuring measurements for an addition condition for the primary secondary cell for dual connectivity with the primary cell, that is, dual connectivity of the UE with both the primary cell and the primary secondary cell.
  • Triggering addition of a primary secondary cell for dual connectivity is dependent upon the measurements meeting the addition condition for the primary secondary cell.
  • a RRCReconfiguration message specifies a ConditionalReconfiguration information element which provides addition conditions for the DC.
  • the ConditionalReconfiguration information element comprises a CondReconfigToAddModList information element.
  • the CondReconfigToAddModList information element comprises condExecutionCond and condRRCReconfig. Addition condition(s) for a primary secondary cell (PSCell) are specified by condExecutionCond.
  • the RRCReconfiguration message to be applied when the specified conditions are met is provided by condRRCReconfig.
  • FIG 1 illustrates an example of a network 100 comprising a plurality of network nodes including terminal nodes 110, access nodes 120 and one or more core nodes 129.
  • the terminal nodes 110 and access nodes 120 communicate with each other.
  • the one or more core nodes 129 communicate with the access nodes 120.
  • the network 100 is in this example a radio telecommunications network, in which at least some of the terminal nodes 110 and access nodes 120 communicate with each other using transmission/reception of radio waves/signals.
  • the one or more core nodes 129 may, in some examples, communicate with each other.
  • the one or more access nodes 120 may, in some examples, communicate with each other.
  • the network 100 may be a cellular network comprising a plurality of cells 122 each served by an access node 120.
  • the interface between the terminal nodes 110 and an access node 120 defining a cell 122 is a wireless interface 124.
  • the access node 120 is a cellular radio transceiver.
  • the terminal nodes 110 are cellular radio transceivers.
  • the cellular network 100 is a third generation Partnership Project (3GPP) network in which the terminal nodes 110 are user equipment (UE 204, see, for example, FIG. 2) and the access nodes 120 are base stations.
  • 3GPP third generation Partnership Project
  • the network 100 is an Evolved Universal Terrestrial Radio Access network (E-UTRAN).
  • the E-UTRAN consists of E-UTRAN NodeBs (eNBs) 120, providing the E-UTRA user plane and control plane (for example, RRC) protocol terminations towards the UE 204.
  • the eNBs 120 are interconnected with each other by means of an X2 interface 126.
  • the eNBs are also connected by means of the S1 interface 128 to the Mobility Management Entity (MME) 129.
  • MME Mobility Management Entity
  • the network 100 is a Next Generation (or New Radio, NR) Radio Access network (NG-RAN).
  • the NG-RAN consists of gNodeBs (gNBs) 120, providing the user plane and control plane (for example, RRC) protocol terminations towards the UE 204.
  • the gNBs 120 are interconnected with each other by means of an X2/Xn interface 126.
  • the gNBs are also connected by means of the N2 interface 128 to the Access and Mobility management Function (AMF).
  • AMF Access and Mobility management Function
  • the network 100 can comprise a combination of E-UTRAN and NG-RAN.
  • a UE 204 can perform a handover procedure to change the serving cell of the UE 204.
  • a handover procedure can be a conditional handover procedure.
  • a conditional handover (CHO) procedure can be considered a handover that is triggered by the UE 204 when one or more handover execution conditions 208 (see, for example, FIG.
  • the handover execution condition or conditions 208 can be pre-configured by the network 100.
  • the UE 204 starts evaluating the execution condition(s) 208 for CHO candidate cells upon receiving a CHO configuration, and executes the handover command once the execution condition(s) 208 are met for a CHO candidate cell.
  • the UE 204 may stop evaluating the execution condition(s) 208 for other candidate cells once the execution condition(s) 208 are met for a candidate cell.
  • a RRCReconfiguration message specifies a ConditionalREconfiguration information element which provides the CHO configuration.
  • the ConditionalReconfiguration information element comprises a CondReconfigToAddModList information element.
  • the CondReconfigToAddModList information element comprises condExecutionCond and condRRCReconfig.
  • Handover execution condition(s) 208 for a primary cell are specified by condExecutionCond.
  • the RRCReconfiguration message to be applied when the specified conditions are met is provided by condRRCReconfig.
  • a UE 204 can be provided with additional radio resources using dual connectivity (DC).
  • DC dual connectivity
  • the configured set of serving cells for a UE 204 has two subsets: the Master Cell Group (MCG) containing the serving cells of a Master Node (MN) 216, and the Secondary Cell Group (SCG) containing the serving cells of a Secondary Node (SN) 218.
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • the MN 216 can be considered to be a network node that provides control plane connectivity towards the core network and the SN 218 can be considered to be a network node that is providing additional radio resources for the UE 204 but is not the MN 216.
  • the MCG comprises a Primary Cell (PCell) for uplink/downlink connection to the MN 216.
  • PCell is the cell of the MCG used to initiate initial access to the MN 216 by the UE 204, for example using a random access procedure.
  • the SCG comprises a Primary Secondary Cell (PSCell) for uplink/downlink connection to the SN 218.
  • PSCell Primary Secondary Cell
  • the PSCell is the cell of the SCG used to initiate initial access to the SN by the UE, for example using a random access procedure.
  • the PSCell can be configured with Physical Uplink Control Channel (PUCCH) resources.
  • PUCCH Physical Uplink Control Channel
  • a RRCReconfiguration message specifies, for the MCG, a MCG configuration via CellGroupConfig and a measurement configuration via measConfig and specifies, for each SCG, a SCG configuration via CellGroupConfig and a measurement configuration via measConfig.
  • the RRCReconfiguration message can also provide a ConditionalReconfiguration information element which provides addition conditions 210 for the DC.
  • the ConditionalReconfiguration information element comprises a CondReconfigToAddModList information element.
  • the CondReconfigToAddModList information element comprises condExecutionCond and condRRCReconfig.
  • Addition condition(s) 210 for a primary secondary cell (PSCell) are specified by condExecutionCond.
  • the RRCREconfiguration message to be applied when the specified conditions are met is provided by condRRCReconfig.
  • a conditional handover with dual connectivity changes the MN 216 (and optionally the SN 218) of a DC configuration.
  • Such a handover is an inter-MN handover.
  • SN terminated SCG bearers terminate in the SN 218 and MN terminated SCG bearers terminate in the MN 216. They are end to end tunnels terminating at the Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • an SCG Bearer can be a user plane bearer with the PDCP either at the MN 216 or the SN 218 but will use the Radio Link Control (RLC), Medium Access Control (MAC) and Physical layers within the SN 218.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • MN terminated MCG bearers terminate in MN 216 and SN terminated MCG bearers terminate in the SN 218. They are end to end tunnels terminating at the Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • an MCG Bearer can be a user plane bearer with the PDCP either at the MN 216 or the SN 218 but will use the Radio Link Control (RLC), Medium Access Control (MAC) and Physical layers within the MN 216.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • a traffic stream can be remapped from an SCG to an MCG bearer (and vice versa) using RRCReconfiguration.
  • bearers are at a higher layer than the physical layer (layer 1) they can be prepared independently to the physical layer connection or lower sub-layer (for example Radio Link Control (RLC) or Medium Access Control (MAC)) connection.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • a physical layer connection between a UE 204 and a network node can be suspended.
  • a UE 204 and the network are configured to maintain resources at higher layers so that, for example, a user plane connection can be quickly resumed when the physical layer connection resumes.
  • the mapping of the bearers may be maintained in anticipation of a resumption of the physical connection.
  • conditional handover with dual connectivity requires a completion of conditional handover to a new primary cell (for example, Target MN 216b) and a completion of addition of a primary secondary cell for dual connectivity (for example, Target SN 218).
  • conditional handover with dual connectivity requires a completion of conditional handover to a new serving MN 216b (i.e., the target MN 216b) and a completion of addition of a SN 218 for dual connectivity.
  • conditional handover when performing conditional handover with dual connectivity, the completion of conditional handover to the primary cell/MN 216 is contemporaneous with a completion of addition of a primary secondary cell/SN 218.
  • the initiation for example, triggering/execution of conditional handover to the primary cell/MN 216 is contemporaneous with a completion of addition of a primary secondary cell/SN 218.
  • conditional handover when performing conditional handover with dual connectivity, the completion of conditional handover to the primary cell/MN 216 occurs before the completion of addition of a primary secondary cell/SN 218.
  • the completion of addition of a primary secondary cell/SN 218 is delayed. This can be described as delayed access.
  • the initiation for example, triggering/execution of conditional handover to the primary cell/MN 216 occurs before the initiation, for example, triggering/execution of addition of a primary secondary cell/SN 218.
  • the initiation of addition of a primary secondary cell/SN 218 is delayed. This can be described as delayed access.
  • conditional handover to the primary cell/MN 216b can, for example, result in direct access of the UE 204 to a new MN 216b; establishment of a radio link between the UE 204 and the MN/MCG that enables the transfer of data via uplink (UL) and/or downlink (DL).
  • the radio link can, for example, be established by initiating a RACH procedure at the UE 204; traffic flow via bearer between the UE 204 and the network via the MN/MCG;
  • the completion of addition of the primary secondary cell/SN 218 can, for example, result in direct access of the UE 204 to a new SN 218; establishment of a radio link between the UE 204 and the SN/SCG that enables the transfer of data via uplink (UL) and/or downlink (DL).
  • the radio link can, for example, be established by initiating a RACH procedure at the UE 204; traffic flow via a bearer between the UE 204 and the network via the SN/SCG;
  • FIG. 2 illustrates an example of a method 200.
  • a plurality of apparatuses transmit and/or receive one or more signals and/or one or more messages across a network.
  • any suitable form of communication in any suitable network setup can be used.
  • at least a portion of the network 100 of FIG. 1 can be used.
  • the method 200 comprises a terminal node 110 and three network nodes in a network.
  • the terminal node 110 is a UE 204
  • the network nodes are a source MN 216a, a target MN 216b and a target SN 218.
  • the method 200, and/or parts of the method 200 can be considered a method 200 for enabling conditional handover with delayed dual connectivity.
  • delayed dual connectivity can be considered to be a delay in and/or delaying and/or enabling delay of and/or allowing delay of and/or facilitating delay of establishing DC configuration at a UE 204.
  • delayed dual connectivity can be considered to be a delay in and/or delaying and/or enabling delay of and/or allowing delay of and/or facilitating delay of addition of a primary secondary cell after conditional handover to a primary cell has been completed.
  • enabling addition of a primary secondary cell based, at least in part, on an addition condition can be considered conditional addition.
  • the method 200 and/or one or more methods disclosed herein can be considered method(s) for enabling conditional addition and/or method(s) for enabling delayed conditional addition.
  • the elements in the example of FIG. 2 can be considered to enable conditional handover with delayed dual connectivity and/or to be configured to enable conditional handover with delayed dual connectivity.
  • communications between elements illustrated in FIG. 2 can proceed via any number of intervening elements, including no intervening elements.
  • UE 204 Although one UE 204 is illustrated in the example of FIG. 2, in examples any suitable number of UEs 204 can be included.
  • any suitable number of network nodes can be included.
  • the UE 204 is connected to the source MN 216a and is to be configured to perform/is to perform conditional handover with duel connectivity to the target MN 216b and target SN.
  • the UE 204 can also be connected to a source SN.
  • at block 250 at least one signal is transmitted from the target MN 216b to the source MN 216a.
  • the at least one signal comprises configuration information 206.
  • one or more messages are transmitted from the target MN 216b to the source MN 216a.
  • the one or more messages can comprise a Handover Request Ack message.
  • the configuration information 206 comprises, at least: a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell.
  • the configuration information 206 comprises, at least: a handover execution condition 208 for enabling conditional handover to the primary cell and an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity.
  • FIG. 2 illustrates one or more actions of transmission of one or more signals
  • FIG. 2 also illustrates the corresponding transmitting/causing transmission feature(s)/action(s).
  • FIG. 2 also illustrates the corresponding receiving/causing receiving feature(s)/action(s).
  • block 250 can be considered to illustrate causing transmission of configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; and an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity.
  • block 250 can be considered to illustrate receiving the configuration information 206 at the source MN 216a.
  • the handover execution condition 208 and/or the addition condition 210 can comprise any suitable condition or conditions.
  • one or more of the conditions can be radio signal conditions.
  • the handover execution condition 208 and/or addition condition 210 can be/comprise a received radio signal power condition and/or a received radio signal quality condition.
  • the handover execution condition 208 and/or addition condition 210 can be based on and/or related to reference signal received power (RSRP) and/or reference signal received quality (RSRQ).
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • the configuration information 206 comprises one or more measurement identities, for example MeaslD-1 , in relation to the primary cell and/or a measurement identity, for example MeaslD-2, in relation to the primary secondary cell.
  • the handover execution condition 208 for the primary cell is event A3 condition and/or the addition condition 210 for the secondary cell is event A4 condition.
  • A3 condition can be for a measurement ID corresponding to the primary cell and A4 condition can be for a measurement ID corresponding to the primary secondary cell.
  • the configuration information 206 comprises: configuration information 206 for handover to the primary cell; and configuration information for enabling the delayed dual connectivity with the primary secondary cell.
  • the configuration information 206 can be considered to be or comprise conditional handover (CHO) configuration information and/or dual connectivity (DC) configuration information.
  • CHO conditional handover
  • DC dual connectivity
  • the configuration information 206 comprises a timeout period value.
  • the timeout period value can be for use by the UE 204 in enabling conditional handover with delayed dual connectivity.
  • the method 200 can comprise determining the configuration information.
  • the configuration information can be determined in any suitable way and/or at any suitable network node(s).
  • determining can include, not least: calculating, computing, processing, deriving, investigating, looking up (for example, looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (for example, receiving information), accessing (for example, accessing data in a memory) and the like. Also, “determining” can include resolving, selecting, choosing, establishing, and the like.
  • the target MN 216b is configured to determine and/or determines at least part of the configuration information 206.
  • the configuration information 206 is received by the source MN 216a and, at block 252, at least one signal and/or at least one message comprising the configuration information is transmitted from the source MN 216a to the UE 204.
  • the at least one message comprises an RRCReconfiguration message.
  • the source MN 216a can change, and/or amend, and/or augment and/or alter the configuration information 206.
  • the source MN 216a can add to the configuration information a timeout period value.
  • the time out period value can be for use by the UE 204 in enabling conditional handover with delayed dual connectivity.
  • the configuration information 206 is received by the UE 204.
  • FIG. 2 illustrates, from the perspective of the UE 204, receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell.
  • the method 200 comprises determining, by the UE 204, whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied.
  • determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied comprises determining and/or making one or more measurements.
  • determining whether the handover execution condition 208 for the primary cell is satisfied comprises performing and/or making one or more measurements and/or determining whether the addition condition 210 is satisfied comprises performing and/or making one or more separate measurements.
  • the one or more measurements comprise one or more radio signal measurements. For example, received radio signal quality and/or received radio signal strength and so on.
  • the method 200 comprises performing one or more measurement for/in relation to the handover execution condition 208 for a primary cell and performing one or more separate measurements for the addition condition 210 for/in relation to a primary secondary cell.
  • determining whether the handover execution condition 208 for the primary cell is satisfied comprises monitoring the primary cell and/or determining whether the addition condition 210 for the primary secondary cell is satisfied comprises monitoring the primary secondary cell.
  • the handover execution condition 208 for the primary cell can be satisfied independently of the addition condition 210 for the primary secondary cell, and vice versa.
  • the method 200 comprises if it is determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • enabling completion of conditional handover to the primary cell comprises transmitting one or more signals and/or messages to the target MN 216b and/or receiving one or more signals and/or messages from the target MN 216b.
  • enabling completion of conditional handover to the primary cell comprises causing performance of and/or performing a random access procedure/process, for example a RACH procedure/process, with the target MN 216b.
  • a random access procedure/process for example a RACH procedure/process
  • enabling completion of conditional handover and conditional addition comprises establishing an active radio link.
  • actions performed with the primary cell and/or target MN 216b to enable completion of conditional handover to the primary cell can be performed similarly with the primary secondary cell and/or target SN 218 to enable completion of addition of the primary secondary cell for dual connectivity.
  • enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity comprises not performing and/or withholding and/or preventing such actions with the target SN 218.
  • not performing and/or withholding and/or preventing transmitting one or more signals and/or messages to the target SN 218, and/or receiving one or more signals and/or messages from the target SN 218, and/or performing a random access procedure/process with the target SN 218, and/or establishing an active radio link with the target SN 218.
  • one or more SCG bearers of the target SN 218 are and/or have been prepared and/or initiated but not activated and/or accessed by the UE 204.
  • SCG bearer(s) of the target SN 218 cannot be used and/or SCG traffic of the target SN 218 cannot occur.
  • the PSCell and/or the SCG of the target SN 218 and/or the target SN 218 can be considered suspended.
  • completion of conditional handover to the primary cell is enabled, without enabling completion of conditional addition to the primary secondary cell for dual connectivity, after a timeout period has expired after the handover execution condition 208 for the primary cell is satisfied.
  • the UE 204 can start a timer and enables completion of conditional handover to the primary cell after a timeout period has expired and/or a predetermined time interval passes.
  • the timer can be considered timer TMN-switch.
  • the method 200 comprises receiving the timeout period value.
  • the UE 204 can receive the timeout period value/timer value in the configuration information 206. See, for example, block 252.
  • timeout period value any suitable timeout period value can be used.
  • a timeout period value in the range 10 milliseconds to 100 milliseconds can be used.
  • a timeout period in the range 25 milliseconds to 75 milliseconds can be used.
  • a timeout period in the range 35 milliseconds to 65 milliseconds can be used.
  • a timeout period of or of approximately or substantially 50 milliseconds can be used.
  • completion of conditional handover to the primary cell can be enabled prior to expiry of the timeout period.
  • completion of conditional handover to the primary cell can be enabled if T310 for the source PCell starts. Accordingly, in examples, completion of conditional handover to the target primary cell can be enabled if the connection to the source PCell begins to degrade and/or fail.
  • the at least one signal and/or message comprises information configured to indicate that the handover to the primary cell is complete.
  • the at least one message can be considered a HO complete message.
  • the at least one message comprises an RRC Reconfiguration Complete message.
  • Any suitable information configured to indicate that the handover to the primary cell is complete can be used.
  • the at least one signal and/or at least one message comprises information configured to provide an indication of the primary secondary cell conditional addition status.
  • the method 200 comprises causing transmission, to a network node, of information configured to provide an indication of the primary secondary cell conditional addition status.
  • the indication of the primary secondary cell conditional addition status comprises at least one of: an indication that the addition condition 210 for the primary secondary cell is not yet satisfied, an indication that an active radio link with the primary secondary cell is not yet established, and where a timeout period is used, a value of a timeout period timer.
  • the at least one signal and/or at least one message comprises information indicative of one or more measurement results of the primary secondary cell. In examples, the at least one signal and/or at least one message comprise one or more measurement results of the primary secondary cell.
  • the method 200 comprises causing transmission of information indicative of one or more measurement results of the primary secondary cell.
  • the UE 204 can be considered to be configured to inform and/or to inform the target MN 216b of one or more aspects of the primary secondary cell conditional addition status.
  • At block 260 at least one signal and/or at least one message is transmitted from the target MN 216b to the target SN 218.
  • the at least one message can comprise a SgNB Reconfiguration complete message.
  • the at least one signal and/or at least one message is configured to inform the target SN 218 that the UE 204 is not yet available.
  • the method 200 comprises informing a target SN that the UE 204 is not yet available.
  • the at least one signal and/or at least one message comprises information configured to indicate that the UE 204 is not yet available. Any suitable information configured to indicate that the UE 204 is not yet available can be used.
  • the at least one signal and/or at least one message comprises at least a portion of the information configured to provide an indication of the primary secondary cell conditional addition status, received by the target MN 216b at block 258.
  • the target MN 216b informs the target SN 218 about the UE 204 not yet being available to ensure that the primary secondary cell/SCG connection is retained even if the UE 204 has not accessed the primary secondary cell and/or to allow the network to release the suspended SCG if it is no longer determined to be useful.
  • the method 200 can be considered to comprise receiving an indication that an addition condition for a primary secondary cell is not satisfied; and maintaining resources for the UE 204 for later enabling addition of the primary secondary cell for dual connectivity at the UE 204, when the addition condition for the primary secondary cell is satisfied. See, for example, block 262.
  • any suitable indication that an addition condition for a primary secondary cell is not satisfied can be used.
  • the at least one signal and/or at least one message received by the target SN 218 at block 260 can be considered to comprise and/or be an indication that an addition condition for a primary secondary cell is not satisfied.
  • the information configured to provide an indication of the primary secondary cell conditional addition status can be considered to be and/or comprise or be comprised in the indication that an addition condition for a primary secondary cell is not satisfied.
  • the target SN 218 maintains resources for the UE 204, based at least in part on the received indication, to enable or allow later addition of the primary secondary cell for dual connectivity at the UE 204. See, for example, block 262.
  • the UE 204 continues to monitor the primary secondary cell to determine whether the addition condition 210 for the primary secondary cell is satisfied.
  • the method 200 comprises determining, by a UE 204, whether the addition condition 210 for the primary secondary cell is satisfied after it is determined that the handover execution condition 208 for the primary cell is satisfied.
  • the method 200 comprises determining, by a UE 204, whether the addition condition 210 for the primary secondary cell is satisfied after conditional handover to the primary cell/target MN 216b is completed.
  • the method 200 comprises enabling completion of conditional addition to the primary secondary cell for dual connectivity.
  • the method 200 comprises if it is determined at a later time that the addition condition 210 for the primary secondary cell is satisfied, enabling completion of conditional addition of the primary secondary cell for dual connectivity.
  • block 262 can be as described in relation enabling conditional handover to the primary cell at block 256 but with respect to the primary secondary cell instead of the primary cell.
  • the method 200 therefore can be considered to comprise subsequently enabling completion of addition of the primary secondary cell for dual connectivity.
  • At block 264 at least one signal and/or at least one message is transmitted from the target SN 218 to the target MN 216b.
  • the at least one signal and/or message comprises information configured to indicate that the handover to the primary secondary cell is complete.
  • the at least one message comprises an SCG activation indication.
  • Any suitable information configured to indicate that the handover to the primary secondary cell is complete can be used.
  • the method 200 therefore can be considered to comprise informing a master node 216b that addition of the primary secondary cell for dual connectivity has been completed.
  • the UE 204 waits until the handover execution condition 208 for the primary cell is met.
  • the handover execution condition 208 for the primary cell is met, the LIE 204 enables completion of conditional handover to the primary cell and again checks if the addition condition 210 is satisfied.
  • the UE 204 can enable completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the method 200 comprises receiving an indication, from the UE 204, that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition of the primary secondary cell for dual connectivity.
  • Any suitable indication received in any suitable way can be used.
  • information received by the target MN 216b at block 256 and/or 258 can be considered to provide such an indication.
  • enabling delay of addition of the primary secondary cell can comprise performing and/or not performing one or more actions.
  • informing target SN 218 at block 260 that the UE 204 is not yet available can form at least part of enabling delay of addition of the primary secondary cell.
  • the method 200 comprises enabling completion of conditional handover to the primary cell without dual connectivity to the primary secondary cell and enabling initiation, but not completion, of addition with dual connectivity to the primary secondary cell.
  • one or more resources can be reserved at the target SN 218 and/or one or more bearers mapped to the target SN 218/SCG, without access/activation.
  • enabling completion of conditional handover to the primary cell and/or enabling delay of addition of the primary secondary cell for dual connectivity and/or enabling completion of addition of the primary secondary cell for dual connectivity comprises remapping bearers.
  • SCG bearers can be remapped to MCG if addition condition 210 is not yet met and/or MCG bearers can be remapped to SCG upon completion of addition of the primary secondary cell for dual connectivity.
  • examples of the disclosure are advantageous.
  • examples of the disclosure provide for the triggering condition with CHO to be decided in a flexible manner.
  • CHO can be executed with suspended SCG, which means, for example, that CHO is not delayed by waiting for suitable SCG. Furthermore, in examples, CHO can be executed if source radio condition degrades (T310 starts), with suspended SCG.
  • FIG. 3 illustrates an example of a method 300.
  • the method 300 can be performed by any suitable apparatus comprising any suitable means for performing the method 300.
  • any suitable apparatus comprising any suitable means for performing the method 300.
  • the method 300 can be performed by a UE 204, such as a UE 204 of FIG 1 and/or FIG 2.
  • the method 300 and/or at least a part of the method 300, can be considered a method 300 for enabling conditional handover with delayed dual connectivity.
  • the method 300 comprises receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell.
  • the method 300 comprises determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied.
  • the method 300 proceeds back to block 304.
  • the method 300 comprises enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the method 300 proceeds to block 308.
  • the method 300 comprises enabling completion of conditional addition of the primary secondary cell for dual connectivity.
  • the method 300 does not proceed to block 308.
  • FIG. 3 illustrates a method 300 comprising: enabling conditional handover with delayed dual connectivity by: receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell; determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied; and if it is determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • FIG. 4 illustrates an example of a method 400.
  • the method 400 can be performed by any suitable apparatus comprising any suitable means for performing the method 400.
  • FIGS 8A and/or 8B For example, an apparatus as described in relation to FIGS 8A and/or 8B.
  • the method 400 can be performed by one or more network nodes, such as a target MN 216b of FIG 2.
  • the method 400 and/or at least a part of the method 400, can be considered a method 400 for enabling conditional handover with delayed dual connectivity.
  • the method 400 comprises causing transmission of configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity.
  • the method 400 comprises receiving an indication, from the UE 204 that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied.
  • the method 400 comprises enabling completion of conditional handover to the primary cell.
  • the method 400 comprises enabling delay of addition of the primary secondary cell for dual connectivity.
  • FIG. 4 illustrates a method 400 comprising: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: causing transmission of configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE 204 that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition to the primary secondary cell for dual connectivity.
  • configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity;
  • FIG. 5 illustrates an example of a method 500.
  • the method 500 can be performed by any suitable apparatus comprising any suitable means for performing the method 500.
  • the method 500 can be performed by one or more network nodes, such as a target SN 218 of FIG 2.
  • the method 500 and/or at least a part of the method 500, can be considered a method 500 for enabling conditional handover with delayed dual connectivity.
  • the method 500 comprises receiving an indication that an addition condition 210 for a primary secondary cell is not satisfied.
  • the method 500 comprises maintaining resources for the UE 204 for later enabling addition of the primary secondary cell for dual connectivity at the UE 204, when the addition condition 210 for the primary secondary cell is satisfied.
  • FIG. 5 illustrates a method 500 comprising: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: receiving an indication that an addition condition for a primary secondary cell is not satisfied; and maintaining resources for the UE for later enabling addition of the primary secondary cell for dual connectivity at the UE, when the addition condition for the primary secondary cell is satisfied.
  • FIG. 6 illustrates an example of a method 600.
  • FIG. 6 can be considered to illustrate some such examples.
  • RRC Radio Resource Control
  • UE 204 When the first condition is met (for the PCell), UE 204 either starts timer, Tmn-switch, for second condition (for the PSCell) to meet (Case 2, timer is configured) or immediately proceeds with checking the second condition (Case 1 , timer is not configured).
  • Case 1 (Timer is not configured): If the timer for the second condition is not configured, the UE 204 detaches from source MN 216a and SN when the first condition is met and performs CHO to the new target MN 216b without accessing the SCG. The access to the SCG is performed when the second condition is met later (and considers the SCG as suspended until then).
  • Case 2 If second condition is not met within the expiry of the specified timer Tmn-switch or until T310 (for source PCell) starts, the UE 204 can proceed with execution of CHO without accessing the SCG.
  • the access to the SCG is performed when the second condition is met later.
  • the UE 204 includes in RRC (Connection) Reconfiguration Complete sent to the target MN during CHO an indication about the “SCG condition”, for example, (1) SCG access condition is not yet met and/or (2) SCG is suspended and/or (3) SCG is not added yet, second condition timer value, and so on.
  • measurement results pertaining to the SCG or SCells may be appended to the HO complete message (which can include indication about whether the SCG/SCells are detectable, and/or any Radio Resource Management (RRM)/Channel State Information (CSI) measurement information is available).
  • RRM Radio Resource Management
  • CSI Channel State Information
  • the network may inform the target SCG about the UE 204 not being available at this time to ensure the SCG connection is still retained even if the UE 204 didn’t access the cell immediately, or to allow network to release the suspended SCG if it’s not seen useful. Later on, when the second condition is met for PSCell, UE 204 triggers the RACH Access and completes the SCG activation.
  • the UE 204 waits until the first condition for PCell is met.
  • the UE 204 executes the CHO but for the access of the PSCell/SCG UE 204 may check either 1) if entering criteria of the measurement event corresponding to the second condition is still met or 2) the leaving criteria of the measurement event corresponding to the second condition is not met.
  • the UE 204 may continue to monitor the second condition. This is to account for any possible radio changes of PSCell while waiting for the first condition to be fulfilled.
  • Step 1 , 2 Target master node 216b decides to prepare new SCG as part of CHO Handover preparation.
  • the source MN 216a transmits to the target MN 216b the Handover request message including information indicating whether the UE and source MN are able to support the DC-HO.
  • the target MN performs SCG preparation with target SN 218.
  • Target master node 216b also includes measurement ID in the measurement config of target SCG linked to condition for UE 204 to start the SCG Access (condition for delayed SCG access).
  • the target MN 216b includes one or more measIDs for the conditional activation of SCG in the target measurement configuration information.
  • the target MN 216b informs this measurement condition also to the Source MN 216a using “Handover Request ACK”. More specifically, the target MN 216b transmits the Handover request ACK message to the Source MN 216a in response to the Handover Request message.
  • the Handover request ACK message includes SCG measurement configuration information for DC-CHO, SCell frequency information and an event A4 Threshold information.
  • the source MN 216a transmits an RRC Reconfiguration message includes CHO configuration for the target DC with two measurement IDs (for example, measlD-1 for Pcell, measlD-2 for PSCell).
  • the RRC Reconfiguration message includes CHO configuration information and timer information for PSCell event.
  • the CHO configuration information includes measurement information related to the measurement ID-1 and measurement information related to the measurement ID-2.
  • step 5 there are two options for the step 5 (options 5-1 and 5-2) for providing the RRC reconfiguration with CHO configuration for target DC.
  • Option 5-1 Provide only one CHO configuration containing only MCG configuration with bearers mapped only to MN
  • a new parameter on the dependency between the measurement ID and Timer for measurement ID-2 can be provided: o Measurement ID-1 (measlD-1) AND Measurement ID-2 (measlD-2) -> Conditional Reconfiguration contents will be executed o Measurement ID-1 AND Timer expires for Measurement ID-2 (measlD-2) Conditional Reconfiguration with Target SCG condition.
  • RRCReconfiguration message contains a conditionalReconfiguration- r16 that includes the conditional configuration for a PCell or PSCell (for CHO or CPC purposes).
  • CondReconfigToAddMod can be adapted by including the following: condRRCReconfig to be extended to include one SCG configuration which means the RRCReconfiguration message provides for exactly one CG-Config instance to the CHO execution condition define by condExecutionCond.
  • SCG ⁇ are provided by the condRRCReconfig extend the condExecutionCond IE to add up to 2 more measld to also include the PSCell.
  • the UE applies the CHO configuration informed by the RRC reconfiguration message of the step 5 for the conditional handover measurement for the PCell (measlD-1) and target PSCell measurement (measlD-2)
  • timer expires for measurement ID-2
  • the UE 204 executes CHO with target MN 216b and includes parameter ‘SCG condition’ in the Handover complete message that SCG is, for example, suspended or not yet accessed.
  • the Handover complete message can be the RRC reconfiguration Complete message and the RRC reconfiguration Complete message further includes SCell measurement results which has measured based on addition condition information and measurement information for the secondary cells.
  • the function of the RRC reconfiguration message can be varied depending on the options 5-1 and 5-2.
  • Target MN 216b remaps the SCG bearers on MCG when the SCG is activated and target MN 216b sends RRCReconfiguration for bearer remapping to the SCG.
  • Step 7b If the target MN 216b intends to continue with the SCG condition, it informs Target SN 218 to wait for additional time for completion of SCG activation by sending the SgNB Reconfiguration Complete message.
  • the UE After the UE performs the CHO, the UE continues measurements based on measurement I Ds for conditional dual connectivity, at the step 8b. For example, if the meas I D-2 condition is met at the step 9b, the UE is able to access to the PSCell managed by the Target SN 218 at the step 10b. After then, the UE initiates a RACH procedure to activate the SCG at the step 11 b. And the target SN transmits the SCG Activation Indication message to the target MN in order to indicate the activated status (and complementing step 7b) .
  • the SCG condition is SCG Suspend, if there were some SN terminated bearers initially mapped to the SN during the CHO execution.
  • FIG. 7 illustrates an example of a method 600.
  • the example of FIG. 7 illustrates an alternative to FIG. 6 after step 6a.
  • the UE 204 applies CHO configuration and release the measurement IDs for conditional activation if both conditions are met. That is to say, the UE 204 applies the target configuration without any changes. But can release the measurement-1 D associated with conditional activation (because this is not needed in this case).
  • the UE transmits the RA and RRC reconfiguration complete message to the target MN 216b.
  • the RRC reconfiguration complete message includes the SCG condition (in this case signalling that SCG is activated) and SCell measurement results for the one or more secondary cells.
  • the target 216b transmits SgNB Reconfiguration Complete message to the SN 218.
  • the UE performs the RACH procedure to activate SCG with the SN 218, at the step 9a.
  • the UE 204 may also indicate the SCG status (i.e. SCG condition and SCell measurements) to the MCG.
  • SCG status i.e. SCG condition and SCell measurements
  • a technical benefit provided by examples of the disclosure is allowing access of the PSCell/SCG to be de-coupled from access of the PCell in inter-MN handover with SN.
  • access of the PSCell/SCG is performed only when a separate second condition is met which provides robustness for the PSCell/SCG access.
  • examples of the disclosure provide for more robust DC setup during CHO handover.
  • Fig 8A illustrates an example of an apparatus 130.
  • the apparatus 130 may be a controller of an apparatus or device such as a terminal node 110, for example UE 204, or network element 216a, 216b and/or 218, such as an eNB or gNB.
  • Implementation of apparatus 130 may be as controller circuitry.
  • the apparatus 130 may be implemented in hardware alone, have certain aspects in software including firmware alone or can be a combination of hardware and software (including firmware).
  • the apparatus 130 may be implemented using instructions that enable hardware functionality, for example, by using executable instructions of a computer program 136 in a general-purpose or special-purpose processor 132 that may be stored on a computer readable storage medium (disk, memory etc.) to be executed by such a processor 132.
  • the processor 132 is configured to read from and write to the memory 134.
  • the processor 132 may also comprise an output interface via which data and/or commands are output by the processor 132 and an input interface via which data and/or commands are input to the processor 132.
  • the memory 134 stores a computer program 136 comprising computer program instructions (computer program code) that controls the operation of the apparatus 130 when loaded into the processor 132.
  • the computer program instructions, of the computer program 136 provide the logic and routines that enables the apparatus 130 to perform at least a portion of the methods illustrated in Figs 2 and/or 3 and/or 4 and/or 5 and/or 6.
  • the processor 132 by reading the memory 134 is able to load and execute the computer program 136.
  • the apparatus 130 therefore comprises: at least one processor 132; and at least one memory 134 including computer program code the at least one memory 134 and the computer program code configured to, with the at least one processor 132, cause the apparatus 130 at least to perform: enabling conditional handover with delayed dual connectivity by: receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell; determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied; and if it is determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the apparatus 130 therefore comprises: at least one processor 132; and at least one memory 134 including computer program code the at least one memory 134 and the computer program code configured to, with the at least one processor 132, cause the apparatus 130 at least to perform: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: causing transmission of configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE 204 that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition of the primary secondary cell for dual connectivity.
  • the apparatus 130 therefore comprises: at least one processor 132; and at least one memory 134 including computer program code the at least one memory 134 and the computer program code configured to, with the at least one processor 132, cause the apparatus 130 at least to perform: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: receiving an indication that an addition condition 210 for a primary secondary cell is not satisfied; and maintaining resources for the UE 204 for later enabling addition of the primary secondary cell for dual connectivity at the UE 204, when the addition condition 210 for the primary secondary cell is satisfied.
  • the computer program 136 may arrive at the apparatus 130 via any suitable delivery mechanism 162.
  • the delivery mechanism 162 may be, for example, a machine readable medium, a computer-readable medium, a non-transitory computer- readable storage medium, a computer program product, a memory device, a record medium such as a Compact Disc Read-Only Memory (CD-ROM) or a Digital Versatile Disc (DVD) or a solid state memory, an article of manufacture that comprises or tangibly embodies the computer program 136.
  • the delivery mechanism may be a signal configured to reliably transfer the computer program 136.
  • the apparatus 130 may propagate or transmit the computer program 136 as a computer data signal.
  • Computer program instructions for causing an apparatus to perform at least the following or for performing at least the following: enabling conditional handover with delayed dual connectivity by: receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell; determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied; and if it is determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • Computer program instructions for causing an apparatus to perform at least the following or for performing at least the following: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: transmitting configuration information 206 comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE 204 that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition to the primary secondary cell for dual connectivity.
  • Computer program instructions for causing an apparatus to perform at least the following or for performing at least the following: enabling conditional handover with delayed dual connectivity at a UE 204 by: receiving an indication that an addition condition 210 for a primary secondary cell is not satisfied; and maintaining resources for the UE 204 for later enabling addition of the primary secondary cell for dual connectivity at the UE 204, when the addition condition 210 for the primary secondary cell is satisfied.
  • the computer program instructions may be comprised in a computer program, a non- transitory computer readable medium, a computer program product, a machine readable medium. In some but not necessarily all examples, the computer program instructions may be distributed over more than one computer program.
  • memory 134 is illustrated as a single component/circuitry it may be implemented as one or more separate components/circuitry some or all of which may be integrated/removable and/or may provide permanent/semi-permanent/ dynamic/cached storage.
  • the memory 134 comprises a random access memory 158 and a read only memory 160.
  • the computer program 136 can be stored in the read only memory 158. See, for example, Fig. 8B
  • the memory 134 can be split into random access memory 158 and read only memory 160.
  • processor 132 is illustrated as a single component/circuitry it may be implemented as one or more separate components/circuitry some or all of which may be integrated/removable.
  • the processor 132 may be a single core or multi-core processor.
  • references to ‘computer-readable storage medium’, ‘computer program product’, ‘tangibly embodied computer program’ etc. or a ‘controller’, ‘computer’, ‘processor’ etc. should be understood to encompass not only computers having different architectures such as single /multi- processor architectures and sequential (Von Neumann)/parallel architectures but also specialized circuits such as field-programmable gate arrays (FPGA), application specific circuits (ASIC), signal processing devices and other processing circuitry.
  • References to computer program, instructions, code etc. should be understood to encompass software for a programmable processor or firmware such as, for example, the programmable content of a hardware device whether instructions for a processor, or configuration settings for a fixed-function device, gate array or programmable logic device etc.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
  • the blocks illustrated in the Figs 2 and/or 3 and/or 4 and/or 5 and/or 6 and/or 7 may represent steps in a method and/or sections of code in the computer program 136.
  • the illustration of a particular order to the blocks does not necessarily imply that there is a required or preferred order for the blocks and the order and arrangement of the block may be varied. Furthermore, it may be possible for some blocks to be omitted.
  • blocks 262 and 264 of FIG. 2 can be omitted.
  • block 308 can, in examples, be omitted.
  • the apparatus 130 can, in examples, comprise means for: enabling conditional handover with delayed dual connectivity by: receiving configuration information 206 comprising at least a handover execution condition 208 for a primary cell and an addition condition 210 for a primary secondary cell; determining whether the handover execution condition 208 for the primary cell is satisfied and whether the addition condition 210 for the primary secondary cell is satisfied; and if it is determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied, enabling completion of conditional handover to the primary cell without enabling completion of addition of the primary secondary cell for dual connectivity.
  • the apparatus 130 can, in examples, comprise means for: enabling conditional handover with delayed dual connectivity at a user equipment, UE, by: causing transmission of configuration information comprising at least: a handover execution condition 208 for a primary cell for enabling conditional handover to the primary cell; an addition condition 210 for a primary secondary cell for enabling conditional handover to the primary cell without enabling addition of the primary secondary cell for dual connectivity; receiving an indication, from the UE 204 that the UE 204 has determined that the handover execution condition 208 for the primary cell is satisfied but the addition condition 210 for the primary secondary cell is not satisfied; enabling completion of conditional handover to the primary cell; and enabling delay of addition of the primary secondary cell for dual connectivity.
  • the apparatus 130 can, in examples, comprise means for: enabling conditional handover with delayed dual connectivity at a user equipment, UE 204, by: receiving an indication that an addition condition 210 for a primary secondary cell is not satisfied; and maintaining resources for the UE 204 for later enabling addition of the primary secondary cell for dual connectivity at the UE 204, when the addition condition 210 for the primary secondary cell is satisfied.
  • an apparatus 130 can comprise means for performing one or more methods, or at least part of one or more methods, as disclosed herein.
  • an apparatus 130 can be configured to perform one or more methods, or at least a part of one or more methods, as disclosed herein.
  • the above described examples find application as enabling components of: automotive systems; telecommunication systems; electronic systems including consumer electronic products; distributed computing systems; media systems for generating or rendering media content including audio, visual and audio visual content and mixed, mediated, virtual and/or augmented reality; personal systems including personal health systems or personal fitness systems; navigation systems; user interfaces also known as human machine interfaces; networks including cellular, non-cellular, and optical networks; ad-hoc networks; the internet; the internet of things; virtualized networks; and related software and services.
  • a property of the instance can be a property of only that instance or a property of the class or a property of a sub-class of the class that includes some but not all of the instances in the class. It is therefore implicitly disclosed that a feature described with reference to one example but not with reference to another example, can where possible be used in that other example as part of a working combination but does not necessarily have to be used in that other example.
  • the presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself and also to features that achieve substantially the same technical effect (equivalent features).
  • the equivalent features include, for example, features that are variants and achieve substantially the same result in substantially the same way.
  • the equivalent features include, for example, features that perform substantially the same function, in substantially the same way to achieve substantially the same result.

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

Abstract

La présente invention concerne un appareil comprenant des moyens pour : permettre un transfert conditionnel avec une double connectivité retardée en : recevant des informations de configuration comprenant au moins une condition d'exécution de transfert pour une cellule primaire et une condition d'ajout pour une cellule secondaire primaire ; déterminant si la condition d'exécution de transfert pour la cellule primaire est satisfaite et si la condition d'ajout pour la cellule secondaire primaire est satisfaite ; et s'il est déterminé que la condition d'exécution de transfert pour la cellule primaire est satisfaite mais que la condition d'ajout pour la cellule secondaire primaire n'est pas satisfaite, permettant l'achèvement du transfert conditionnel vers la cellule primaire sans permettre l'achèvement de l'ajout de la cellule secondaire primaire pour la double connectivité.
PCT/EP2021/070622 2020-08-05 2021-07-23 Transfert intercellulaire conditionnel WO2022028918A1 (fr)

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WO2023193272A1 (fr) * 2022-04-08 2023-10-12 北京小米移动软件有限公司 Procédé et appareil de mise à jour de groupes de cellules de dispositif terminal à double connectivité
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WO2024045908A1 (fr) * 2022-08-30 2024-03-07 大唐移动通信设备有限公司 Procédé d'accès à une cellule, procédé de configuration de condition d'exécution, terminal et dispositif côté réseau
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