Conditional Access

Abstract

12. An apparatus comprising: means for receiving secondary radio link failure information, the secondary radio link failure information indicating a failure situation in a secondary radio link between a user equipment and at least one source secondary node while the user equipment is configured to conditionally access the at least one target secondary node, the user equipment having dual connectivity with the source master node and the source secondary node; means for determining a plurality of proposed target primary cells of a secondary cell group to be prepared by the at least one target secondary node for conditional access by the user equipment; and means for determining, based at least in part on the received secondary radio link failure information, assistance information that assists the at least one target secondary node in determining which at least one of the plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment; and means for directly or indirectly transmitting information indicating the plurality of proposed target primary cells of the secondary cell group and the determined assistance information to the at least one target secondary node.

Description

[Technical Field]

[0001] Examples of the present disclosure relate to conditional access. Some examples relate to conditional access of a target secondary node. [Background technology]

[0002] A wireless network comprises a plurality of network nodes, including end nodes and access nodes, and communication between the end nodes and the access nodes is wireless.

[0003] In some situations, it may be desirable to improve or enhance the conditional access of a target secondary node by an end node. Summary of the Invention

[0004] According to various, but not necessarily all, embodiments, an apparatus is provided, the apparatus comprising: means for receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access at least one target secondary node, and the user equipment has dual connectivity with the source master node and the source secondary node; means for determining a plurality of proposed target primary cells of a secondary cell group prepared by at least one target secondary node for conditional access by the user equipment; means for determining assistance information based at least in part on the received secondary radio link failure information, the assistance information assisting the at least one target secondary node in determining which at least one of a plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment; means for directly or indirectly transmitting at least one of the plurality of proposed target primary cells of the secondary cell group and the determined assistance information to at least one target secondary node; Equipped with.

[0005] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0006] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0007] In some examples, transmitting the information indicating the plurality of proposed target primary cells of the secondary cell group and the determined assistance information includes transmitting at least one SgNB Change Required message and / or at least one SgNB Addition Request message.

[0008] In some examples, the information indicating the multiple proposed target primary cells of the secondary cell group includes at least one cell identity.

[0009] In some examples, the means comprises: at least one processor; at least one memory for storing instructions; The instructions, when executed by at least one processor, result in the implementation of the apparatus.

[0010] According to various, but not necessarily all, embodiments, a method is provided, the method comprising: receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access the at least one target secondary node, and the user equipment has dual connectivity with the source master node and the source secondary node; determining a plurality of proposed target primary cells of a secondary cell group prepared by at least one target secondary node for conditional access by the user equipment; determining assistance information based at least in part on the received secondary radio link failure information, the assistance information assisting the at least one target secondary node in determining which at least one of a plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment; transmitting, directly or indirectly, information indicating a plurality of proposed target primary cells of the secondary cell group and the determined assistance information to at least one target secondary node; Includes:

[0011] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0012] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0013] In some examples, transmitting the information indicating the plurality of proposed target primary cells of the secondary cell group and the determined assistance information includes transmitting at least one SgNB change required message and / or at least one SgNB Addition Request message.

[0014] In some examples, the information indicating the multiple proposed target primary cells of the secondary cell group includes at least one cell identity.

[0015] According to various, but not necessarily all, embodiments, a computer program is provided that includes instructions that cause an apparatus to perform at least the following: receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access the at least one target secondary node, and the user equipment has dual connectivity with the source master node and the source secondary node; determining a plurality of proposed target primary cells of a secondary cell group prepared by at least one target secondary node for conditional access by the user equipment; determining assistance information based at least in part on the received secondary radio link failure information, the assistance information assisting the at least one target secondary node in determining which at least one of a plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment; transmitting, directly or indirectly, information indicating a plurality of proposed target primary cells of the secondary cell group and the determined assistance information to at least one target secondary node; This is to ensure that the following is implemented.

[0016] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0017] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0018] In some examples, transmitting the information indicating the plurality of proposed target primary cells of the secondary cell group and the determined assistance information includes transmitting at least one SgNB change required message and / or at least one SgNB Addition Request message.

[0019] In some examples, the information indicating the multiple proposed target primary cells of the secondary cell group includes at least one cell identity.

[0020] According to various, but not necessarily all, embodiments, an apparatus is provided, the apparatus comprising: means for receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by the target secondary node for conditional access by the user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; means for determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; means for transmitting conditional access configuration information to the master node, the conditional access configuration information indicating the determined at least one target primary cell of the secondary cell group; Equipped with.

[0021] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0022] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0023] In some examples, receiving the information indicating a plurality of proposed target primary cells of the secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

[0024] In some examples, the assistance information originates from a source master node or a source secondary node.

[0025] According to various, but not necessarily all, embodiments, a method is provided, the method comprising: receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by the target secondary node for conditional access by the user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; transmitting conditional access configuration information to the master node, the conditional access configuration information indicating the determined at least one target primary cell of the secondary cell group; Includes:

[0026] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0027] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0028] In some examples, receiving the information indicating a plurality of proposed target primary cells of the secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

[0029] In some examples, the assistance information originates from a source master node or a source secondary node.

[0030] According to various, but not necessarily all, embodiments, a computer program is provided that includes instructions that cause an apparatus to perform at least the following: receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by the target secondary node for conditional access by the user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; transmitting conditional access configuration information to the master node, the conditional access configuration information indicating the determined at least one target primary cell of the secondary cell group; This is to ensure that the following is implemented.

[0031] In some examples, the assistance information includes priority information for multiple proposed target primary cells of the secondary cell group for preparation by the at least one target secondary node for conditional access by the user equipment.

[0032] In some examples, the assistance information includes information indicating the number of times a proposed target primary cell of the secondary cell group was the correct choice for conditional access by the user equipment.

[0033] In some examples, receiving the information indicating a plurality of proposed target primary cells of the secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

[0034] In some examples, the assistance information originates from a source master node or a source secondary node.

[0035] According to various, but not necessarily all, embodiments, an apparatus is provided, the apparatus comprising: at least one processor; at least one memory for storing instructions; which instructions, when executed by at least one processor, cause the apparatus to at least perform at least a portion of one or more methods disclosed herein.

[0036] According to various, but not necessarily all, embodiments, an apparatus is provided that comprises means for performing at least a portion of one or more of the methods disclosed herein.

[0037] Various, but not necessarily all, examples are provided that are claimed in the appended claims.

[0038] Although the above examples and optional features of the present disclosure are described separately, it is understood that their provision in all possible combinations and permutations is included within the present disclosure. It is understood that various examples of the present disclosure can include any or all of the features described with respect to other examples of the present disclosure, and vice versa. Similarly, it is recognized that any one or more or all of the features can be implemented by / included in / enabled by apparatus, methods, and / or computer program instructions, in any combination, as desired and necessary.

[0039] A description of a function should also be considered to disclose any suitable means for implementing that function.

[0040] Some examples will now be described with reference to the accompanying drawings. [Brief explanation of the drawings]

[0041] [Figure 1] 1A and 1B illustrate examples of the subject matter described herein. [Figure 2] FIG. 1 illustrates another example of the subject matter described herein. [Figure 3A] FIG. 1 illustrates another example of the subject matter described herein. [Figure 3B] FIG. 1 illustrates another example of the subject matter described herein. [Figure 4] FIG. 1 illustrates another example of the subject matter described herein. [Figure 5] FIG. 1 illustrates another example of the subject matter described herein. [Figure 6] FIG. 1 illustrates another example of the subject matter described herein. [Figure 7A] FIG. 1 illustrates another example of the subject matter described herein. [Figure 7B] FIG. 1 illustrates another example of the subject matter described herein. DETAILED DESCRIPTION OF THE INVENTION

[0042] The figures are not necessarily to scale. Certain features and views of the figures may be shown diagrammatically or exaggerated in scale for clarity and conciseness. For example, the dimensions of some elements of the figures may be exaggerated relative to other elements to aid in illustration. Like reference numerals are used in the figures to designate like features. For clarity, not all reference numerals are necessarily shown in every figure.

[0043] definition Master Node (MN): A network node that provides control plane connectivity towards the core network.

[0044] Master Cell Group (MCG): A group of cells associated with an MN, including PCells and SCells.

[0045] Secondary Node (SN): A network node that provides additional radio resources for a UE, but is not an MN.

[0046] Secondary Cell Group (SCG): A group of cells associated with an SN, including PSCells and SCells.

[0047] PCell: A cell for uplink / downlink connection to an MN. A cell of an MCG used to initiate initial access to an MN.

[0048] PSCell: A cell for uplink / downlink connection to an SN. A cell of an SCG used to initiate initial access to an SN.

[0049] Conditional Handover (CHO): A handover procedure that is triggered by the UE only when a configured execution condition is met for a prepared candidate cell. The condition is pre-configured by the network. In 3GPP, the conditional handover execution condition is specified by condExecutionCond in the CondReconfigToAddModList information element in the conditional reconfiguration information element in the RRC reconfiguration message.

[0050] Dual Connectivity (DC): The UE has simultaneous connections to the MN and the SN, which is the operation mode of the UE in RRC_CONNECTED, which is configured by the master cell group and the secondary cell group.

[0051] Configuration information: Information used to configure the operation of a UE. In 3GPP, configuration information may be provided, for example, in an RRC reconfiguration message. The term "configuration information comprising" an entity (e.g., handover execution conditions for a primary cell, SN addition conditions for dual connectivity with a primary cell, etc.) can mean that the configuration information includes sufficient information to obtain the entity. It may or may not include all parameters of the entity; it may instead comprise a pointer to the entity or parameters of the entity, or it can mean that the configuration includes the entity.

[0052] In 3GPP, the RRC reconfiguration message specifies a conditional reconfiguration information element that provides additional information about the DC. The conditional reconfiguration information element includes a CondReconfigToAddModList information element. The CondReconfigToAddModList information element includes condExecutionCond and condRRCReconfig. Additional conditions for the primary secondary cell (PSCell) are specified by condExecutionCond. The RRC reconfiguration message to be applied when the specified conditions are met is provided by condRRCReconfig.

[0053] Measurement Configuration Configuration information used to configure a UE to perform measurements. In 3GPP, the measurement configuration may be provided, for example, in an RRC reconfiguration message. The term "[entity] measurement configuration" (e.g., source primary cell measurement configuration) may refer to a measurement configuration prepared by an entity.

[0054] A can contains one or more measurement objects and one or more reporting configurations associated by one or more measurement identities.

[0055] The can contains the MeasConfig information element specified in TS 38.331.

[0056] 1 shows an example of a network 100 comprising multiple network nodes, including end nodes 110, access nodes 120, and one or more core nodes 129. The end nodes 110 and the access nodes 120 communicate with each other. The one or more core nodes 129 communicate with the access nodes 120.

[0057] Network 100, in this example, is a wireless telecommunications network in which at least some of the end nodes 110 and access nodes 120 communicate with each other using the transmission / reception of radio waves / signals.

[0058] One or more core nodes 129 may, in some examples, communicate with each other. One or more access nodes 120 may, in some examples, communicate with each other.

[0059] Network 100 may be a cellular network comprising multiple cells 122, each served by an access node 120. In this example, the interface between end node 110 and access node 120 that defines cell 122 is a wireless interface 124.

[0060] The access node 120 is a cellular radio transceiver. The end node 110 is a cellular radio transceiver.

[0061] In the illustrated example, cellular network 100 is a third generation Partnership Project (3GPP) network in which terminal nodes 110 are user equipment (UE) and access nodes 120 are base stations.

[0062] In the example, network 100 is an Evolved Universal Terrestrial Radio Access network (E-UTRAN). E-UTRAN consists of E-UTRAN Node Bs (eNBs) 120 that provide E-UTRA user plane and control plane (RRC) protocol terminations towards UEs 110. The eNBs 120 are interconnected with each other by an X2 interface 126. The eNBs are also connected to a Mobility Management Entity (MME) 129 by an S1 interface 128.

[0063] In another example, network 100 is a Next Generation Radio Access network (NG-RAN). The NG-RAN consists of gNodeBs (gNBs) 120 that provide user plane and control plane (RRC) protocol terminations towards UEs 110. The gNBs 120 are interconnected with each other by an Xn interface 126. The gNBs are also connected to an Access and Mobility Management Function (AME) by an N2 interface 128.

[0064] In an example, the network 100 may comprise a combination of E-UTRAN and NG-RAN.

[0065] User equipment may comprise mobile equipment. When reference is made to user equipment, the reference includes and encompasses reference to mobile equipment, wherever possible.

[0066] The UE 168 may perform a handover procedure to change the serving cell of the UE 168. In an example, the handover procedure may be a conditional handover procedure.

[0067] A conditional handover (CHO) procedure may be considered a handover that is triggered by the UE 168 when one or more handover execution conditions are met. The one or more handover execution conditions may be pre-configured by the network 100.

[0068] In an example, the UE 168 may be equipped with additional radio resources that use dual connectivity (DC).

[0069] In the DC, the configured set of serving cells for the UE 168 has two subsets: a Master Cell Group (MCG) containing the serving cells of the Master Node (MN) 172 and a Secondary Cell Group (SCG) containing the serving cells of the Secondary Node (SN) 170.

[0070] In an example, a conditional change of a primary cell (PSCell) of a secondary cell group may be configured. The UE 168 may be configured with an execution condition for performing an SN change to one or more target SNs 166. Thus, the UE 168 may be configured to conditionally access one or more target SNs 166.

[0071] In an example, at least one target SN 166 may be configured to efficiently and / or intelligently prepare, and may efficiently and / or intelligently prepare, at least one target PSCell for conditional access by a UE 168.

[0072] FIG. 2 illustrates an example of a method 200 .

[0073] In an example, Figure 2 can be considered to illustrate multiple methods. For example, Figure 2 illustrates one or more actions among multiple actors / entities. In an example, Figure 2 can be considered to illustrate multiple methods performed by individual actors / entities.

[0074] One or more of the features discussed in connection with FIG. 2 may be found in one or more of the other figures.

[0075] In the example of Figure 2, multiple devices transmit and / or receive one or more signals and / or one or more messages across, through, and / or using a network. In the example, any suitable form of communication in any suitable network may be used. For example, at least a portion of network 100 of Figure 1 may be used.

[0076] Thus, in the example, the devices of FIG. 2 form at least a portion of the network 100 described in connection with FIG.

[0077] In the example shown, the terminal node 110 and the three access nodes 120 transmit and / or receive one or more signals and / or one or more messages. In the example of Figure 2, the terminal node 110 is a UE 168, and the three access nodes 120 are a source MN 172, a source SN 172, and a target SN 166.

[0078] In the example of FIG. 2, the UE 168 has dual connectivity with a source MN 172 and a source SN 170 .

[0079] In examples, communication and / or transmission between the elements shown in FIG. 2 may proceed through any number of intervening elements, including no intervening elements.

[0080] Although one UE 168 is shown in the example of FIG. 2, any suitable number of UEs 168 may be included in an example.

[0081] Similarly, any suitable number of network nodes may be included in an example.

[0082] In examples, method 200 and / or at least portions of method 200 may be considered a method for enforcing conditional access of a target SN.

[0083] In examples, method 200 and / or at least portions of method 200 may be considered a method for enhancing the selection of at least one target PSCell for conditional access by a UE.

[0084] In examples, method 200 and / or at least portions of method 200 may be considered a method of providing assistance information to a target SN to assist the UE in selecting at least one target PSCell for conditional access.

[0085] In the example shown, the location of the block indicates the entity that performs the action, e.g., block 202 is performed at / by source SN 170.

[0086] In examples, method 200 is part of a method for configuring and / or permitting and / or enabling a UE 168 to conditionally access at least one target SN 166. In some examples, method 200 is part of a conditional PSCell addition and Change (CPAC) method / process / procedure. For example, method 200 can be part of a conditional PSCell Change (CPC) method / process / procedure or a conditional PSCell Addition (CPA) method / process.

[0087] In some examples, method 200 may be considered SN-initiated, i.e., in some examples, method 200 may be initiated by source SN 170. For example, method 200 may be part of an SN-initiated CPAC method / process / procedure.

[0088] In the example shown, method 200 is SN-initiated, with blocks 202, 204, and 206 being performed at / by source SN 170 and block 208 including source SN 170.

[0089] In some examples, method 200 may be considered MN-initiated, i.e., in some examples, method 200 may be initiated by the source MN 172. For example, method 200 may be part of an MN-initiated CPAC method / process / procedure.

[0090] In such an example, blocks 202 , 204 , and 206 are performed in / by source MN 172 , and block 208 is performed in / by source MN 172 .

[0091] At block 202, the method 200 includes receiving secondary link failure (S-RLF) information 164, the S-RLF information indicating a situation of failure of a secondary radio link between the UE 168 and at least one source SN 170 while the UE 168 is configured to conditionally access at least one target SN 166, and the UE 168 has dual connectivity with the source MN 172 and the source SN 170.

[0092] In some examples, the method 200 includes receiving secondary link failure (S-RLF) information 164 associated with at least one target secondary node 166, the S-RLF information indicating a situation of failure of a secondary radio link between the UE 168 and at least one source SN 170 while the UE 168 is configured to conditionally access the at least one target SN 166, and the UE 168 has dual connectivity with the source MN 172 and the source SN 170.

[0093] Because FIG. 2 illustrates one or more actions, for example, receiving one or more signals, FIG. 2 also illustrates the corresponding sending / sending feature / action that results.

[0094] Similarly, for any sending / resulting sending feature / action, FIG. 2 also shows the corresponding receiving / resulting receiving feature / action.

[0095] For example, from the perspective of the UE 168, block 202 may be considered to indicate transmitting the S-RLF information 164.

[0096] In some examples, the S-RLF information 164 may be considered secondary cell group (SCG) failure information.

[0097] Receiving the S-RLF failure information 164 may be performed in any suitable manner using any suitable method. In examples, receiving the S-RLF information 164 includes receiving one or more signals and / or messages.

[0098] In an example, the S-RLF information 164 may be received from any suitable number of different UEs 168. Thus, in an example, the S-RLF information 164 indicates secondary radio link failure conditions experienced by multiple different UEs.

[0099] In some examples, at block 202, the method 200 includes receiving secondary link failure (S-RLF) information 164, the S-RLF information indicating a situation of a failure of a secondary radio link between multiple UEs 168 and at least one source SN 170 while the UEs 168 are configured to conditionally access at least one target SN 170, and the UEs 168 have dual connectivity with the source MN 172 and the source SN 170.

[0100] The S-RLF information 164 may be received and / or collected over any suitable period of time. For example, the S-RLF information 164 may be received from multiple UEs 168 over a period of time sufficient to allow sufficient S-RLF information 164 to be received to enable method 200 to be performed. For example, the S-RLF information 164 may be received over a period of time sufficient to allow sufficient S-RLF information 164 to be received to enable assistance information 176 to be determined at block 206.

[0101] In examples, the period can be a few hours, half a day, one day, two to three days, one week, two to three weeks, one month, and the like.

[0102] In an example, S-RLF information 164 may be received over a Key Performance Indicator (KPI) collection period.

[0103] The S-RLF information 164 may include any suitable information. For example, the S-RLF information 164 may include any suitable information indicating a situation of failure of a secondary radio link between the UE 168 and at least one source SN 170 while the UE 168 is configured to conditionally access at least one target SN 166, and the UE 168 has dual connectivity with the source MN 172 and the source SN 170.

[0104] For example, S-RLF information 164 may include any suitable information to enable assistance information 176 to be determined in block 206 .

[0105] In an example, the S-RLF information 164 includes SCG failure report information sent by the UE 168 when the UE 168 detects a radio link failure for a connection with a PSCell of the source SN 170.

[0106] The S-RLF information 164 may include information about the failure type (e.g., due to downlink or uplink radio problems) and / or location information of the UE 168 and / or received signal power information and / or time information and / or configuration of the UE 168, etc.

[0107] In the example of FIG. 2, the method 200 is SN initiated, with the S-RLF information 164 being sent from the UE 168 to the source MN 172 and forwarded by the source MN 172 to the source SN 170 .

[0108] However, in an MN-initiated example, S-RLF information 164 may be sent from UE 168 to source MN 172 without forwarding S-RLF information 164 to source SN 170 , and block 202 is performed at / by source MN 172 .

[0109] In an example, the S-RLF information 164 is associated with at least one target SN 166 and indicates a secondary radio link failure situation between the UE 168 and at least one source secondary node 170 while the UE 168 is configured to conditionally access the at least one target SN 166.

[0110] The S-RLF information 164 may be considered to be associated with the target SN 166 because the S-RLF information 164 resulted from a failure of a secondary radio link that occurred while the UE 168 was configured to conditionally access the target SN 166.

[0111] The secondary wireless link failure situation may be considered as a secondary wireless link failure condition.

[0112] The secondary wireless link failure condition may be considered as a secondary wireless link setup and / or failure condition.

[0113] The secondary radio link failure conditions may be considered to be the physical and / or radio conditions experienced by the UE 168 for a period of time prior to the S-RLF.

[0114] Any suitable period may be used, for example, any suitable period that adequately covers the S-RLF scenario.

[0115] For example, a period in the range of 5 seconds to 30 minutes may be used.

[0116] For example, a period in the range of 30 seconds to 20 minutes may be used.

[0117] For example, a period in the range of 1 minute to 15 minutes may be used.

[0118] For example, a period in the range of 5 to 10 minutes may be used.

[0119] In an example, the period can be at least M seconds, where M is a positive integer.

[0120] In an example, the period can be at least X minutes, where X is a positive integer.

[0121] As an example, reference is made to the example of FIG. 3A.

[0122] 3A illustrates an example scenario. In the example of FIG. 3A, a UE 168 is located within and served by a source PSCell 188.

[0123] In the example shown, the UE 168 moves along a trajectory 196, and as the UE 168 moves along the trajectory 196, the UE detects two PSCells, namely, PSCell1 190 and PSCell2 192.

[0124] FIG. 3B shows plots of reference signal received power (RSRP) for source PSCell 188, PSCell1 190, and PSCell2 192 as UE 168 moves along trajectory 196 shown in the example of FIG. 3A.

[0125] With respect to the plot shown in the example of FIG. 3B, at time t1, PSCell1 190 reaches a measurable signal strength that fulfills the RSRP offset 194 configured in UE 168, triggering preparation of PSCell1 190 as a candidate cell for conditional access by UE 168, such as CPC.

[0126] At time t2, PSCell2 192 also meets the RSRP offset 194 preparation criteria configured in UE 168, and a measurement event report is sent from UE 168 to source PSCell 188, which then triggers, e.g., an SgNB (conditional) Change Required message to the MN and, e.g., an SgNB (conditional) Addition Request message from the MN to the target SN, including the measurement results of target PSCell1 190 and PSCell2 192.

[0127] In the example shown, the target SN may decide to prepare target PSCell1 190 because target PSCell1 190 has the best reception measurements.

[0128] However, later in the example of FIG. 3B, at time instance t3, the UE 168 experiences a secondary radio link failure with respect to the current serving PSCell and sends S-RLF failure information to the MN.

[0129] In the example shown, the target SN is late in preparing target PSCell2 192, which results in an S-RLF in source PSCell 188 because the conditional access execution criteria for PSCell1 190 to be prepared was not met.

[0130] 3A and 3B may be considered to illustrate S-RLF conditions experienced by a UE 168. In the example of FIG. 3, S-RLF information 164 includes information indicative of conditions, such as UE trajectory 196 and / or RSRP measurements and / or timing and / or UE configuration.

[0131] In the example of Figures 3A and 3B, the information included in S-RLF information 164 may indicate that target PSCell2 192 should be prepared in this case (because target PSCell2 192 had the best measurement when the S-RLF occurred).

[0132] However, in this example, the target SN 166 has made decisions about which cells to prepare as candidates for conditional access, e.g., CPAC, by the UE 168 based on information available at the time. Furthermore, the number of cells that can be prepared may be limited.

[0133] Returning to the example of FIG. 2 , in the example, the S-RLF information 164 indicates a situation of failure in a secondary radio link between the UE 168 and at least one source secondary node 170 while the UE 168 is configured to conditionally access at least one target SN 166.

[0134] The UE 168 may be configured to conditionally access the at least one target SN 166 in any suitable manner using any suitable method. For example, the UE 168 may receive any suitable configuration information to configure the UE 168 to access the at least one target SN 166 upon meeting at least one criterion.

[0135] In an example, the UE 168 may be configured with at least one CPAC configuration. For example, the UE 168 may be configured with at least one CPC or CPA configuration.

[0136] In an example, accessing a PSCell or any other suitable cell includes performing a random access procedure with the cell.

[0137] In an example, accessing a PSCell or any other suitable cell includes establishing a connection with the cell.

[0138] In an example, source SN 170 or source MN 172 in the MN-initiated example may determine statistics based at least in part on received S-RLF information 164. For example, source SN 170 or source MN 172 in the MN-initiated example may determine statistics based on a significant amount of wrong target PSCell preparations observed by S-RLF information 164, see, e.g., Figures 3A and 3B.

[0139] In examples, this may be done until statistical convergence is achieved.

[0140] At block 204 , the method 200 includes determining a plurality of proposed target PSCells 174 prepared by at least one target secondary node 166 for conditional access by the UE 168 .

[0141] Determining the plurality of proposed target PSCells 174 to be prepared by the at least one target SN 166 may be performed in any suitable manner using any suitable method. For example, determining the plurality of proposed target PSCells 174 at block 204 may be performed as part of a CPAC method / process / procedure, such as as part of a CPC method / process / procedure or a CPA method / process / procedure.

[0142] In an example, the target SN 166 may not be able to prepare a PSCell for conditional access by the UE 168 that is not included in the proposed target PSCell 174.

[0143] In an example, the source SN 170, or the source MN 172 in an MN-initiated example, may determine that a change in the PSCell may be required for the UE 168 and perform block 206 based at least in part on that determination. For example, the source SN 170 (or the source MN 172) may receive at least one measurement report from the UE 168 and determine that a change in the PSCell may be required for the UE 168 based at least in part on the received at least one measurement report.

[0144] The UE 168 may be a UE 168 from which the S-RLF information 164 was received, or may be a UE 168 from which the S-RLF information 164 was not received.

[0145] In some examples, the source SN 170 (or the source MN 172) determines a conditional access execution condition for each of the multiple proposed target PSCells 174. For example, the source SN 170 (or the source MN 172) can determine a CPAC execution condition, e.g., a CPC or CPA execution condition, for each of the multiple proposed target PSCells 174.

[0146] In some examples, the source SN 170 (or source MN) determines the maximum amount of target PSCells that can be provisioned by the target SN 166. Thus, in examples, the target SN provides a limited number of target PSCells from a plurality of proposed target PSCells 174.

[0147] At block 206, the method 200 includes determining, based at least in part on the received S-RLF information 164, assistance information 176, the assistance information configured to and / or assisting the at least one target SN 166 in determining which of a plurality of proposed target PSCells 174 to prepare by the at least one target SN 166 for conditional access by the UE 168.

[0148] Block 206 may be implemented in any suitable manner using any suitable method. In an example, received S-RLF information 164 may be used in any suitable manner to determine assistance information 176.

[0149] For example, S-RLF information 164 may be processed and / or analyzed in any suitable manner to enable assistance information 176 to be determined. For example, statistics determined from S-RLF information 164 may be used when determining assistance information 174.

[0150] Thus, in an example, determining assistance information 176 based at least in part on received S-RLF information 164 includes determining assistance information 176 based at least in part on an analysis of received S-RLF information 164 and / or statistics determined from received S-RLF information 164.

[0151] For example, with respect to the example of FIG. 3, the determined assistance information 176 is configured to assist the UE 168 in preparing the candidate PSCell2 192 instead of the candidate PSCell1 190 for conditional access by the UE 168.

[0152] In some examples, determining the assistance information includes using a mobility robustness optimization algorithm and / or artificial intelligence and / or machine learning techniques.

[0153] The assistance information 176 may include any suitable information having any suitable form. For example, the assistance information 176 may include any suitable information to assist the at least one target SN 166 in determining which at least one of a plurality of proposed target PSCells 174 is to be prepared by the at least one target SN 166 for conditional access by the UE 168.

[0154] In an example, the assistance information 176 may include any suitable information to indicate to the target SN that at least one of the plurality of proposed target PSCells 174 is to be preferentially prepared compared to at least one other of the plurality of proposed target PSCells 174.

[0155] In an example, the assistance information may include any suitable information to indicate a ranking of multiple proposed target PSCells 174 for preparation by at least one target SN 166 for conditional access by the UE 168.

[0156] In some examples, the assistance information 176 includes priority information for multiple proposed target PSCells 174 for preparation by at least one target SN 166 for conditional access by the UE 168.

[0157] Priority information may be considered as information that indicates to the target SN 166 to prioritize the preparation of at least one particular proposed target PSCell 174 among a plurality of proposed target PSCells 174 over at least one other proposed target PSCell 174.

[0158] For example, the priority information may indicate to the target SN 166 in the example of FIG. 3 to prioritize the preparation of target PSCell2 192 over target PSCell1 190 for conditional access by the UE 168.

[0159] The priority information may include any suitable information having any suitable form, for example, the priority information may include any suitable information for indicating to the target SN 166 that the preparation of at least one particular proposed target PSCell 174 of the plurality of proposed target PSCells 174 is to be prioritized over at least one other proposed target PSCell 174.

[0160] In an example, the priority information may include a value associated with each of the plurality of proposed target PSCells 174 that indicates a priority of the associated target PSCell. For example, the priority information may include a value between 0 and 100 for the plurality of proposed PSCells 174, e.g., 0 indicating the lowest priority and 100 indicating the highest priority.

[0161] In some examples, the assistance information 176 includes information indicating the number of times the proposed target PSCell 174 was the correct choice for conditional access by the UE 168.

[0162] In an example, the information indicating the number of times the proposed target PSCell 174 was the correct selection for conditional access by the UE 168 may include any suitable information having any suitable form. For example, the information indicating the number of times the proposed target PSCell 174 was the correct selection for conditional access by the UE 168 may indicate the number of times in absolute or relative terms.

[0163] For example, the information may indicate the number of times each of the multiple proposed target PSCells 174 was the correct choice and / or may indicate the percentage of time each of the multiple proposed target PSCells 174 was the correct choice.

[0164] In the event of an S-RLF, if conditional access of the target PSCell by the UE 168 would have prevented the S-RLF, the target PSCell may be considered the correct choice for conditional access by the UE 168.

[0165] For example, in the example of Figure 3, PSCell2 192 may be considered the correct choice for conditional access by UE 168 because, under the circumstances of an S-RLF failure in the example of Figure 3, if UE 168 were configured to conditionally access PSCell2 192, S-RLF would have been prevented.

[0166] At block 208, the method 200 includes directly or indirectly transmitting information 178 indicative of the plurality of proposed PSCells 174 and the determined Assistance Information 176 to at least one target SN 166.

[0167] As a result, FIG. 2 illustrates a method 200, which includes: receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 172 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170; determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node for conditional access by the user equipment 168; determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; transmitting, directly or indirectly, information 178 indicating a plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166; Includes:

[0168] The information 178 indicative of the plurality of proposed PSCells 174 and the determined assistance information 176 may include any suitable information.

[0169] In some examples, the information 178 indicating the multiple proposed target PSCells 174 includes at least one cell identity, such as at least one physical cell identity (PCI) and / or at least one global cell identity.

[0170] Block 208 may be implemented in any suitable manner using any suitable method. In an example, transmitting information 178 in block 208 includes transmitting at least one signal and / or message.

[0171] In some SN-initiated examples, information 178 in block 208 is transmitted from source SN 170 to source MN 172 and forwarded by source MN 172 to at least one target SN 166 .

[0172] In some MN-initiated examples, information 178 in block 208 is transmitted from a source MN 172 to at least one target SN 166 .

[0173] In some examples, transmitting information 178 indicating the plurality of proposed target PSCells 174 and the determined assistance information 176 includes transmitting at least one SgNB Change Required message and / or at least one SgNB Addition Request message.

[0174] In an example, from the perspective of the target SN 166, block 208 includes receiving information 178 indicating a plurality of proposed target PSCells 174 to be prepared by the target SN 166 for conditional access by the UE 168, and assistance information 176 configured to assist the target SN 166 in determining which at least one of the plurality of proposed target PSCells is to be prepared by the at least one target SN 166 for conditional access by the UE 168, the assistance information 176 being determined at least in part based on S-RLF information 164 associated with the target SN 166.

[0175] In an example, from the perspective of the target SN 166, receiving information 178 indicating a plurality of proposed target PSCells 174 and assistance information 176 includes receiving at least one SgNB Addition Request message.

[0176] In the example, the assistance information 176 originates from the source MN 172 or the source SN 170 .

[0177] At block 210, determining at least one of a plurality of proposed target PSCells 174 to be prepared for conditional access by the UE 168 based at least in part on the received assistance information 176.

[0178] Block 210 may be implemented in any suitable manner using any suitable method.

[0179] In an example, the assistance information 176 may be used in any suitable manner to assist the target SN 166 in determining which at least one of a plurality of proposed target PSCells 174 is prepared for conditional access by the UE 168.

[0180] In some examples, the assistance information 176 is used by the target SN 166 to determine which at least one of the plurality of proposed target PSCells 174 should be preferentially prepared for conditional access by the UE 168 compared to at least one other of the plurality of proposed target PSCells 174.

[0181] In an example, the target SN 166 may determine, based at least in part on the assistance information 176, which at least one of the multiple proposed target PSCells 174 has one or more highest priorities for preparation for conditional access by the UE 168.

[0182] For example, in at least some examples where the assistance information 176 includes priority information, the target SN 166 can determine which at least one of the multiple proposed target PSCells 174 has one or more associated highest priority values.

[0183] For example, in at least some examples where the assistance information includes information indicating the number of times a proposed target PSCell 174 was the correct selection for conditional access by the UE 168, the target SN 166 can determine which at least one or more of the multiple proposed PSCells 174 has the maximum number of times associated with it.

[0184] For example, with respect to the example of FIG. 3A, the assistance information 176 may include a priority value of 80 for PSCell2 192 and a priority value of 20 for PSCell1 190, avoiding S-RLF and assisting the target SN 166 in preferentially preparing PSCell2 192 for conditional access by the UE 168.

[0185] In an example, the target SN 166 may prepare the determined at least one of the plurality of proposed target PSCells 174 for conditional access by the UE 168. The target SN 166 may prepare the determined at least one of the plurality of proposed target PSCells 174 for CPAC, e.g., for CPC or CPA.

[0186] In an example, the target SN 166 may prepare conditional access configuration information 186 for the determined at least one of the plurality of proposed target PSCells 174.

[0187] The conditional access configuration information 186 may include any suitable information for configuring the UE 168 to access the determined at least one of the plurality of proposed target PSCells 174 upon meeting at least one criterion.

[0188] In an example, the conditional access configuration information 186 may include CPAC configuration information. For example, the conditional access configuration information 186 may include CPA or CPC configuration information.

[0189] In some examples, the conditional access configuration information 186 includes a CPAC configuration, such as a CPA or CPC configuration, for each of the determined at least one of the plurality of proposed target PSCells 174.

[0190] At block 210, the method 200 includes transmitting conditional access configuration information 186 indicating the determined at least one target PSCell to the MN 172. In an example, the determined at least one target PSCell is the at least one target PSCell determined in / at block 210.

[0191] As a result, FIG. 2 illustrates a method 200, which includes: receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure information 164 associated with the target secondary node 166; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of the secondary cell group that is prepared for conditional access by the user equipment; transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group; Includes:

[0192] In an example, the conditional access configuration information 186 may be considered conditional access configuration information 186 of and / or for the determined at least one target PSCell.

[0193] Block 210 may be implemented in any suitable manner using any suitable method. In an example, transmitting the conditional access configuration information 186 indicating the determined at least one target PSCell to the MN 172 includes transmitting at least one signal and / or message.

[0194] In some examples, the target SN 166 transmits to the MN 172 an identifier, for example, a cell identity, such as a physical cell identity (PCI) and / or a global cell identity, of the prepared target PSCell.

[0195] In an example, method 200 may then proceed according to a conditional access method / process / procedure to configure the UE to conditionally access the target SN 165 based at least in part on the information transmitted in block 212.

[0196] For example, the method 200 may then proceed according to a CPAC method / process / procedure, such as a CPA or CPC method / process / procedure. See, for example, FIG.

[0197] In examples, the method 200 may be repeated any suitable number of times.

[0198] As mentioned above, examples may utilize mobility robustness optimization algorithms. In this regard, a Self-Organizing Network (SON) is a network that can automatically adjust radio network parameters based on collected statistics from the network. Mobility Robustness Optimization (MRO), in examples, is an example of a SON that handles the adjustment of parameters that control cell changes (e.g., PSCell changes).

[0199] In MRO, the network, in an example, collects statistics (fault reports can be one of the statistics) over a specific period, indicated, for example, by a KPI collection period. At each KPI collection period, for example, the KPI statistics are processed by the network, and a decision is made to make a change. The network applies the change, for example, to assistance information, and collects new statistics regarding the change, for example, within a new KPI collection period.

[0200] This process may be repeated by the network until the KPI collection period is reached and the process determines that nothing needs to be done (e.g., the problem has been resolved or it is no longer possible to adjust the thresholds / offsets).

[0201] In this case, the MRO can be considered to have converged. In the example, the values ​​of the performance metrics collected in each of the KPI collection periods should be statistically significant (large number of statistics) in order to have reliable network decisions when making changes.

[0202] Examples of the present disclosure are advantageous and provide technical benefits.

[0203] For example, examples of the present disclosure enable a target SN to select a suitable target PSCell among proposed target PSCells.

[0204] For example, examples of the present disclosure reduce radio link failures caused by preparing an incorrect candidate PSCell.

[0205] FIG. 4 illustrates an example of a method 400 .

[0206] In examples, method 400 may be performed by any suitable apparatus comprising any suitable means for performing method 400. For example, an apparatus described in connection with Figures 7A and / or 7B.

[0207] In an example, the method 400 may be performed by a source SN 170, such as the source SN of FIG.

[0208] In an example, the method 400 may be performed by a source MN 172, such as the source MN of FIG.

[0209] At block 402, the method 400 includes receiving secondary wireless link failure information 164, where the secondary wireless link failure information 164 indicates a situation of failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170.

[0210] At block 404 , the method 400 includes determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168 .

[0211] At block 406, the method 400 includes determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 to assist the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168.

[0212] At block 408, the method 400 includes directly or indirectly transmitting information 178 indicating the plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166.

[0213] As a result, FIG. 4 illustrates a method 400, which includes: receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170; determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168; determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; transmitting, directly or indirectly, information 178 indicating a plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166; Includes:

[0214] FIG. 5 illustrates an example of a method 500 .

[0215] In examples, method 500 may be performed by any suitable apparatus comprising any suitable means for performing method 500. For example, the apparatus described in connection with Figures 7A and / or 7B.

[0216] In an example, the method 500 may be performed by a target SN 166, such as the target SN 166 of FIG.

[0217] At block 502, the method 500 includes receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined based at least in part on secondary radio link failure 164 information associated with the target secondary node 166.

[0218] At block 504, the method 500 includes determining, based at least in part on the received assistance information 176, at least one of a plurality of proposed target primary cells 174 of the secondary cell group prepared for conditional access by the user equipment 168.

[0219] At block 506, the method 500 includes transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group.

[0220] As a result, FIG. 5 illustrates a method 500, which includes: receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure 164 information associated with the target secondary node 166; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of the secondary cell group that is prepared for conditional access by the user equipment; transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group; Includes:

[0221] FIG. 6 illustrates an example of a method 600 .

[0222] Some examples relate to 3rd Generation Partnership Project (3GPP) networks. Figure 6 can be considered to illustrate some such examples.

[0223] The following discussion can be considered to illustrate some such examples.

[0224] In the example of Figure 6, multiple devices transmit and / or receive one or more signals and / or one or more messages across, through, and / or using a network. In the example, any suitable form of communication in any suitable network may be used. For example, at least a portion of network 100 of Figure 1 may be used.

[0225] Thus, in the example, the devices of FIG. 6 form at least a portion of the network 100 described in connection with FIG.

[0226] In the example shown, the terminal node 110 and the four or more access nodes 120 transmit and / or receive one or more signals and / or one or more messages. In the example of Figure 6, the terminal node 110 is a UE 168, and the four or more access nodes 120 are a source MN 172, a source SN 170, a target SN 166, and other possible target nodes 166n.

[0227] In the example of FIG. 6, the UE 168 has dual connectivity with a source MN 172 and a source SN 170 .

[0228] In examples, communication and / or transmission between the elements shown in FIG. 6 may proceed through any number of intervening elements, including no intervening elements.

[0229] Although one UE 168 is shown in the example of FIG. 6, any suitable number of UEs 168 may be included in an example.

[0230] Similarly, any suitable number of network nodes may be included in an example.

[0231] A high level flow chart is shown in Figure 6, where SN initiated CPC is performed, however, in examples, MN initiated CPC may be performed.

[0232] Block 1: The source SN uses the SCG fault information report received from the UE to collect information / statistics about the 'wrong CPC preparation list' and updates its priority / information to be sent to other nodes in case of SN change.

[0233] Aspect 1 Block 2: The source SN initiates the inter-SN PSCell change by indicating to the target SN that it would like to prioritize the preparation of a particular target PSCell over other target PSCells by providing a priority for each proposed target PSCell. Block 3 / 4: The MN forwards the received priority to the target SN together with an SgNB Addition Request.

[0234] Aspect 2: Note that this aspect can be implemented in addition to or independently of aspect 1. Block 5: The source SN initiates the inter-SN PSCell change by indicating to the target SN, for each proposed target PSCell, information about the probability of success of being the correct PSCell. This number can be an absolute number or a percentage. Block 6 / 7: The MN forwards the received information to the target SN together with an SgNB Addition Request.

[0235] Block 8 / 9: The target SN / other possible target nodes, while selecting a target PSCell for CPC configuration, prioritizes target PSCells with high priority or high probability of success as indicated by the source SN.

[0236] In block 10 / 11: The target SN sends the CPC configuration for each prepared target PSCell and the ID of the prepared target PSCell to the MN. In block 12, the MN sends a conditional (re)configuration including the CPC configuration of the candidate target PSCell together with the CPC execution condition to the UE. In block 13, the UE sends a message to the MN confirming receipt of the conditional configuration, which then confirms the SN change preparation to the source SN in block 14. In block 15, the UE evaluates the CPC execution conditions of the prepared target PSCell. In block 16, the CPC execution condition is met for the PSCell candidate in the target SN1. The UE sends a message to the MN indicating the execution of the CPC configuration in block 17. The message contains an embedded SN RRC reconfiguration end to the target SN1, which is sent in block 18. The UE finishes the random access in block 19.

[0237] 7A shows an example of apparatus 130. Apparatus 130 may be a controller of an apparatus of a device such as an end node 110, e.g., a UE 168, or a network element 172, 170, and / or 166, such as an eNB or gNB. Apparatus 130 may also be considered a controller.

[0238] An implementation of 130 may be controller circuitry. Controller 130 may be implemented solely in hardware, may have certain aspects in software including firmware only, or may be a combination of hardware and software (including firmware).

[0239] As shown in FIG. 7A, the controller 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, which may be stored on a computer-readable storage medium (disk, memory, etc.) for execution by such processor 132.

[0240] Processor 132 is configured to read from and write to memory 134. Processor 132 may include an output interface, through which data and / or commands are output by processor 132, and an input interface, through which data and / or commands are input to processor 132.

[0241] The memory 134 stores a computer program 136 including computer program instructions (computer program code), which, when loaded into the processor 132, controls the operation of the device 130. The computer program instructions of the computer program 136 provide the logic and routines that enable the device to implement the methods illustrated in the accompanying figures. The processor 132 can load and execute the computer program 136 by reading the memory 134.

[0242] In an example, the device 130 at least one processor 132; at least one memory 134 containing computer program code; and at least one memory 134 and computer program code configured to cause the device 130 to execute, by the at least one processor 132, at least: receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170; determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168; determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and and transmitting, directly or indirectly, information 178 indicating the plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166. The method is configured to perform the following steps.

[0243] In an example, the device 130 at least one processor 132; at least one memory 134 containing computer program code; and at least one memory 134 and computer program code configured to cause the device 130 to execute, by the at least one processor 132, at least: receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure 164 information associated with the target secondary node 166; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; and transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group; The method is configured to perform the following steps.

[0244] In an example, the device 130 at least one processor 132; at least one memory 134 containing computer program code; the at least one memory storing instructions that, when executed by the at least one processor 132, cause the apparatus to at least: receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170; determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168; determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and and transmitting, directly or indirectly, information 178 indicating the plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166. Have them do this.

[0245] In an example, the device 130 at least one processor 132; at least one memory 134 containing computer program code; the at least one memory storing instructions that, when executed by the at least one processor 132, cause the apparatus to at least: receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure 164 information associated with the target secondary node 166; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; and transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group; Have them do this.

[0246] 7A, the computer program 136 may arrive at the device 130 by 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 recording medium such as a Compact Disc Read-Only Memory (CD-ROM) or a Digital Versatile Disc (DVD) or a solid-state memory, or an article of manufacture that comprises or tangibly embodies the computer program 136. The delivery mechanism may also be a signal configured to reliably transfer the computer program 136. The device 130 may propagate or transmit the computer program 136 as a computer data signal.

[0247] The device comprises at least the following: receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 has dual connectivity with the source master node 172 and the source secondary node 170; determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168; determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and and transmitting, directly or indirectly, information 178 indicating the plurality of proposed target primary cells 174 of the secondary cell group and the determined assistance information 176 to at least one target secondary node 166. Computer program instructions for causing, or at least for carrying out,

[0248] The device comprises at least the following: receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure 164 information associated with the target secondary node 166; determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; and transmitting conditional access configuration information 186 to the master node 172 indicating the determined at least one target primary cell of the secondary cell group; Computer program instructions for causing, or at least for carrying out,

[0249] The computer program instructions may be included in a computer program, a non-transitory computer-readable medium, a computer program product, a machine-readable medium, etc. In some, but not necessarily all, examples, the computer program instructions may be distributed across two or more computer programs.

[0250] Although shown as a single component / circuitry, memory 134 may be implemented as one or more separate components / circuitry, some or all of which may be integrated / removable and / or provide permanent / semi-permanent / dynamic / cached storage.

[0251] In an example, the memory 134 comprises a random access memory 158 and a read-only memory 160. In an example, the computer program 136 may be stored in the read-only memory 158. See, for example, Figure 8B.

[0252] Although the processor 132 is shown 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.

[0253] References to a "computer-readable storage medium," "computer program product," "tangibly embodied computer program," etc., or to a "controller," "computer," "processor," etc., should be understood to encompass computers having different architectures, such as single / multi-processor architectures and sequential (von Neumann) / parallel architectures, as well as special purpose circuitry, such as field-programmable gate arrays (FPGAs), application specific circuits (ASICs), signal processing devices, and other processing circuitry. References to a computer program, instructions, code, etc., should be understood to encompass software for a programmable processor, whether instructions for a processor, configuration settings for a fixed function device, gate array, or programmable logic device, etc., or firmware, e.g., the programmable content of a hardware device.

[0254] As used in this application, the term "circuitry" refers to the following: (a) hardware-only circuitry implementations (e.g., implementations using only analog and / or digital circuitry); and (b) a combination of hardware circuitry and software, e.g., (where applicable); (i) a combination of analog circuitry and / or digital hardware circuitry with software / firmware; and (ii) any portion of a hardware processor (including a digital signal processor) with software, software, and one or more memories that work together to cause a device, such as a mobile phone or a server, to perform various functions; and (c) hardware circuitry and / or processors, such as microprocessors or portions of microprocessors, that require software (e.g., firmware) to operate, but the software may not be present when not required for operation; It may refer to one or more or all of the following:

[0255] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers simple hardware circuits or processors and their (or their) accompanying software and / or firmware implementations. The term circuitry also covers, for example, and where applicable to particular claim elements, baseband integrated circuits for mobile devices or similar integrated circuits in servers, cellular network devices, or other computing or network devices.

[0256] The blocks shown in the accompanying figures may represent method steps and / or sections of code within 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 to the blocks, and the order and arrangement of the blocks may vary. Additionally, some blocks may be omitted.

[0257] When a structural feature is described, that function or functions may be explicitly described, implicitly described, or replaced by a means that performs one or more of the functions of the structural feature.

[0258] Therefore, the device 130 may, in the example: means for receiving secondary wireless link failure information 164, the secondary wireless link failure information 164 indicating a situation of a failure in a secondary wireless link between the user equipment 168 and at least one source secondary node 170 while the user equipment 168 is configured to conditionally access at least one target secondary node 166, the user equipment 168 having dual connectivity with the source master node 172 and the source secondary node 170; means for determining a plurality of proposed target primary cells 174 of a secondary cell group prepared by at least one target secondary node 166 for conditional access by the user equipment 168; means for determining, based at least in part on the received secondary radio link failure information 164, assistance information 176 that assists the at least one target secondary node 166 in determining which at least one of a plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; means for directly or indirectly transmitting information 178 indicative of a plurality of proposed target primary cells 174 of the secondary cell group and determined assistance information 176 to at least one target secondary node 166; It can be equipped with:

[0259] Therefore, the device 130 may, in the example: means for receiving information 178 indicating a plurality of proposed target primary cells 174 of a secondary cell group to be prepared by the target secondary node 166 for conditional access by the user equipment 168, and assistance information 176 configured to assist the target secondary node 166 in determining which at least one of the plurality of proposed target primary cells 174 of the secondary cell group is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the assistance information 176 is determined based at least in part on secondary radio link failure 164 information associated with the target secondary node 166; means for determining, based at least in part on the received assistance information, at least one of a plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; means for transmitting conditional access configuration information 186 to the master node 172, the conditional access configuration information 186 indicating the determined at least one target primary cell of the secondary cell group; It can be equipped with:

[0260] In an example, the device 130 may comprise means for performing one or more methods or at least a portion of one or more methods as described herein.

[0261] In an example, device 130 may be configured to perform one or more methods or at least a portion of one or more methods as described herein.

[0262] Systems, devices, methods, and computer programs may use machine learning, which can include statistical learning. Machine learning is a field of computer science that gives computers the ability to learn without being explicitly programmed. A computer learns from experience E for a class of tasks T and a performance measure P if its performance at the task T, as measured by P, improves with experience E. Computers can often learn from prior training data to make predictions about future data. Machine learning includes fully or partially supervised learning and fully or partially unsupervised learning. Machine learning may enable discrete outputs (e.g., classification, clustering) and continuous outputs (e.g., regression). Machine learning may be implemented, for example, using different approaches, such as cost function minimization, artificial neural networks, support vector machines, and Bayesian networks. Cost function minimization may be used, for example, in linear and polynomial regression and K-means clustering. For example, an artificial neural network with one or more hidden layers models the complex relationship between input and output vectors. Support vector machines may be used for supervised learning. A Bayesian network is a directed acyclic graph that shows the conditional independence of multiple random variables.

[0263] The examples described above apply as enabling components of automotive systems, telecommunications systems, electronic systems including consumer electronic products, distributed computing systems, media systems that generate or render audio, visual, and audiovisual content, and media content including mixed reality, mediated reality, virtual reality, 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.

[0264] The apparatus may be provided in an electronic device, such as a mobile terminal, in accordance with examples of the present disclosure. However, it should be understood that a mobile terminal is merely illustrative of an electronic device that would benefit from example implementations of the present disclosure and, therefore, should not be considered to limit the scope of the present disclosure to mobile terminals. In certain example implementations, the apparatus may be provided in a mobile terminal, but other types of electronic devices, such as, but not limited to, mobile communication devices, hand-portable electronic devices, wearable computing devices, portable digital assistants (PDAs), pagers, mobile computers, desktop computers, televisions, gaming devices, laptop computers, cameras, video recorders, GPS devices, and other types of electronic systems, can readily use examples of the present disclosure. Furthermore, devices can readily use examples of the present disclosure regardless of their intended purpose of providing mobility.

[0265] The term "comprise" is used in this document in an inclusive, non-exclusive sense. That is, any reference to X comprises Y indicates that X may comprise only one Y, or may comprise two or more Ys. Where it is intended to use "comprise" in the exclusive sense, this will be made clear in the context by a reference to "comprising only one ..." or by using "consisting."

[0266] In this description, the terms "connect," "couple," "communication," and their derivatives mean to be operatively connected / coupled / in communication. That is, it should be recognized that any number or combination of intervening components may be present (including no intervening components) to provide a direct or indirect connection / coupling / communication. Any such intervening components may include hardware and / or software components.

[0267] As used herein, the terms "determine / determining" (and grammatical variations thereof) can include at least calculating, computing, processing, deriving, measuring, investigating, identifying, looking up (e.g., looking up in a table, database, or another data structure), ascertaining, etc. Similarly, the term "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), obtaining, etc. Similarly, "determining" can include resolving, selecting, choosing, establishing, etc.

[0268] In this description, reference has been made to various examples. The description of a feature or function in connection with an example indicates that the feature or function is present in that example. The use of the term "example" or "for example" or "can" or "may" in the text indicates that such feature or function is present in at least the described example, whether or not explicitly stated, and that, whether or not described in the example, it may, but does not necessarily, be present in some or all of the other examples. Thus, "example," "for example," "can," or "may" refers to a particular instance within a class of examples. Properties of an instance can be properties of that instance only or of the class or of a subclass of the class that includes some but not all of the instances in the class. Thus, a feature described with reference to one example but not another example implicitly discloses that it can, if possible, be used in the other example as part of a practical combination, but not necessarily used in the other example.

[0269] Although examples have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the given examples can be made without departing from the scope of the claims.

[0270] Features described in the preceding description may be used in combinations other than those explicitly described above.

[0271] Although functions have been described with reference to particular features, those functions may be implemented by other features, whether or not described.

[0272] Although features have been described with reference to particular examples, those features may be present in other examples, whether or not described.

[0273] The terms "a," "an," or "the" are used in this document with an inclusive, rather than exclusive, meaning. That is, a reference to X comprising one / an / the Y indicates that X may comprise only one Y or may comprise two or more Ys, unless the context clearly indicates the contrary. If "a," "an," or "the" is intended to be used with an exclusive meaning, this will be clear in the context. In some circumstances, the use of "at least one" or "one or more" may be used to emphasize an inclusive meaning, but the absence of these terms should not be considered to infer any exclusive meaning.

[0274] The presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) by itself, and similarly to features that achieve substantially the same technical effect (equivalent features). Equivalent features include, for example, features that are modifications and achieve substantially the same result in substantially the same way. Equivalent features include, for example, features that perform substantially the same function in substantially the same way to achieve substantially the same result.

[0275] In this description, reference has been made to various examples using adjectives or adjective phrases to describe properties of the examples. Such description of a property in relation to an example indicates that the property is present in some of the examples just described and is present in other examples that are substantially described.

[0276] The above description describes several examples of the present disclosure; however, those skilled in the art will know of possible alternative structural and method features, which provide equivalent functionality to the specific examples of such structural and method features described herein above, and which have been omitted from the above description for brevity and clarity. Nevertheless, the above description should be read as implicitly including references to such alternative structural and method features, which provide equivalent functionality, unless such alternative structural or method features are expressly excluded in the above description of examples of the present disclosure.

[0277] While efforts have been made in the foregoing specification to draw attention to features believed to be important, it should be understood that applicant may seek protection in the claims with respect to any patentable feature or combination of features previously described with reference to and / or shown in the drawings, whether or not emphasized.

Claims

1. means for receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access at least one target secondary node, and the user equipment has dual connectivity with a source master node and a source secondary node; means for determining a plurality of proposed target primary cells of a secondary cell group prepared by the at least one target secondary node for conditional access by user equipment; means for determining, based at least in part on the received secondary radio link failure information, assistance information to assist the at least one target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment; means for directly or indirectly transmitting information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information to the at least one target secondary node; An apparatus comprising:

2. 2. The apparatus of claim 1, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

3. The apparatus of claim 1 or 2, wherein the assistance information includes information indicating the number of times the proposed target primary cell of a secondary cell group was a correct choice for conditional access by a user equipment.

4. The apparatus of any one of claims 1 to 3, wherein transmitting information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information includes transmitting at least one SgNB Change Required message and / or at least one SgNB Addition Request message.

5. The apparatus of claim 1 , wherein the information indicating the plurality of proposed target primary cells of a secondary cell group includes at least one cell identity.

6. The means comprises: at least one processor; at least one memory for storing instructions; 6. The apparatus of claim 1, comprising: instructions that, when executed by the at least one processor, result in the implementation of the apparatus.

7. receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access at least one target secondary node, and the user equipment has dual connectivity with a source master node and a source secondary node; determining a plurality of proposed target primary cells of a secondary cell group prepared by the at least one target secondary node for conditional access by user equipment; determining, based at least in part on the received secondary radio link failure information, assistance information that assists the at least one target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment; transmitting, directly or indirectly, information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information to the at least one target secondary node; A method comprising:

8. 8. The method of claim 7, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

9. The method of claim 7 or 8, wherein the assistance information comprises information indicating the number of times the proposed target primary cell of a secondary cell group was the correct choice for conditional access by a user equipment.

10. A method according to any one of claims 7 to 9, wherein transmitting information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information comprises transmitting at least one SgNB change required message and / or at least one SgNB Addition Request message.

11. The method according to any one of claims 7 to 10, wherein the information indicating the plurality of proposed target primary cells of a secondary cell group includes at least one cell identity.

12. A computer program comprising instructions that cause an apparatus to perform at least the following: receiving secondary radio link failure information, the secondary radio link failure information indicating a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node while the user equipment is configured to conditionally access at least one target secondary node, and the user equipment has dual connectivity with a source master node and a source secondary node; determining a plurality of proposed target primary cells of a secondary cell group prepared by the at least one target secondary node for conditional access by user equipment; determining, based at least in part on the received secondary radio link failure information, assistance information that assists the at least one target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment; transmitting, directly or indirectly, information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information to the at least one target secondary node; A computer program for causing the computer to execute the above.

13. 13. The computer program product of claim 12, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

14. 14. The computer program product of claim 12 or 13, wherein the assistance information comprises information indicating the number of times the proposed target primary cell of a secondary cell group was the correct choice for conditional access by a user equipment.

15. The computer program of any one of claims 12 to 14, wherein transmitting information indicating the plurality of proposed target primary cells of a secondary cell group and the determined assistance information includes transmitting at least one SgNB change required message and / or at least one SgNB Addition Request message.

16. The computer program product of any one of claims 12 to 15, wherein the information indicating the plurality of proposed target primary cells of a secondary cell group includes at least one cell identity.

17. means for receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by a target secondary node for conditional access by user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; means for determining, based at least in part on the received assistance information, at least one of the plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; means for transmitting conditional access configuration information indicating the determined at least one target primary cell of a secondary cell group to a master node; An apparatus comprising:

18. 20. The apparatus of claim 17, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

19. 19. The apparatus of claim 17 or 18, wherein the assistance information comprises information indicating the number of times the proposed target primary cell of a secondary cell group was a correct choice for conditional access by a user equipment.

20. The apparatus of any one of claims 17 to 19, wherein receiving the information indicating the plurality of proposed target primary cells of a secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

21. The apparatus of any one of claims 17 to 20, wherein the assistance information originates from a source master node or a source secondary node.

22. receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by a target secondary node for conditional access by user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; determining, based at least in part on the received assistance information, at least one of the plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; transmitting conditional access configuration information indicating the determined at least one target primary cell of a secondary cell group to a master node; A method comprising:

23. 23. The method of claim 22, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

24. 24. The method of claim 22 or 23, wherein the assistance information comprises information indicating the number of times the proposed target primary cell of a secondary cell group was the correct choice for conditional access by a user equipment.

25. A method according to any one of claims 22 to 24, wherein receiving the information indicating the plurality of proposed target primary cells of a secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

26. The method of any one of claims 22 to 25, wherein the assistance information originates from a source master node or a source secondary node.

27. A computer program comprising instructions that cause an apparatus to perform at least the following: receiving information indicating a plurality of proposed target primary cells of a secondary cell group to be prepared by a target secondary node for conditional access by user equipment, and assistance information configured to assist the target secondary node in determining which at least one of the plurality of proposed target primary cells of a secondary cell group is to be prepared by the at least one target secondary node for conditional access by user equipment, the assistance information being determined at least in part based on secondary radio link failure information associated with the target secondary node; determining, based at least in part on the received assistance information, at least one of the plurality of proposed target primary cells of a secondary cell group prepared for conditional access by the user equipment; transmitting conditional access configuration information indicating the determined at least one target primary cell of a secondary cell group to a master node; A computer program for causing the computer to execute the above.

28. 28. The computer program product of claim 27, wherein the assistance information includes priority information for the plurality of proposed target primary cells of a secondary cell group for preparation by the at least one target secondary node for conditional access by user equipment.

29. 29. The computer program product of claim 27 or 28, wherein the assistance information comprises information indicating the number of times the proposed target primary cell of a secondary cell group was the correct choice for conditional access by a user equipment.

30. The computer program of any one of claims 27 to 29, wherein receiving the information indicating the plurality of proposed target primary cells of a secondary cell group and the assistance information includes receiving at least one SgNB Addition Request message.

31. The computer program of any one of claims 27 to 30, wherein the assistance information originates from a source master node or a source secondary node.

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