Conditional access

Abstract

An apparatus comprising means for receiving secondary radio link failure information, wherein the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, the user equipment is in dual connectivity with a source main node and a source auxiliary node; determining a plurality of suggested target primary cells in a secondary cell group, the plurality of suggested target primary cells being to be prepared by the at least one target secondary node for conditional access by the user equipment; determining secondary information based at least in part on the received secondary radio link failure information, wherein the assistance information assists the at least one target secondary node in determining which target primary cell of the plurality of suggested target primary cells in a secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment; and directly or indirectly transmitting information indicating the plurality of suggested target primary cells in the secondary cell group and the determined secondary 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 to a target secondary node. Background Art

[0002] A wireless network includes a plurality of network nodes, which include terminal nodes and access nodes. Communication between the terminal nodes and the access nodes is wireless.

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

[0004] According to various but not necessarily all embodiments, an apparatus is provided, including components for the following operations:

[0005] Receiving secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, and the user equipment is having dual connectivity with a source master node and a source secondary node;

[0006] Determining a plurality of proposed target primary cells in a secondary cell group that will be prepared by the at least one target secondary node for conditional access by the user equipment;

[0007] Determining auxiliary information at least partially based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining at least which one of the plurality of proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment; and

[0008] Sending, directly or indirectly, information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information to the at least one target secondary node.

[0009] In some examples, the auxiliary information includes priority information of a plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by the user equipment.

[0010] In some examples, the auxiliary information includes information indicating the number of times the proposed target primary cell in the secondary cell group is a correct selection for conditional access by the user equipment.

[0011] In some examples, sending information indicating the plurality of proposed target primary cells in a secondary cell group and the determined auxiliary information includes: sending at least one SgNB change required message and / or at least one SgNB addition request message.

[0012] In some examples, the information indicating the plurality of proposed target primary cells in the secondary cell group includes at least one cell identifier.

[0013] In some instances, the component includes

[0014] at least one processor; and

[0015] at least one memory storing instructions that, when executed by the at least one processor, cause the operation of the device.

[0016] According to various but not necessarily all embodiments, a method is provided that includes:

[0017] Receiving secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, and the user equipment is having dual connectivity with a source primary node and a source secondary node;

[0018] Determining a plurality of proposed target primary cells in a secondary cell group that will be prepared by the at least one target secondary node for conditional access by the user equipment;

[0019] Determining auxiliary information at least in part based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining which of the plurality of proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment; and

[0020] Directly or indirectly sending to the at least one target secondary node information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information.

[0021] In some examples, the auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by the user equipment.

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

[0023] In some examples, sending the information of multiple proposed target primary cells in the indicated secondary cell group and the determined auxiliary information includes: sending at least one SgNB change required message and / or at least one SgNB addition request message.

[0024] In some examples, the information of multiple proposed target primary cells in the indicated secondary cell group includes at least one cell identifier.

[0025] According to various but not necessarily all embodiments, a computer program is provided, including instructions for causing a device to at least perform the following operations:

[0026] Receive secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in the secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, and the user equipment is having dual connectivity with a source primary node and a source secondary node;

[0027] Determine multiple proposed target primary cells in the secondary cell group that will be prepared by the at least one target secondary node for conditional access by the user equipment;

[0028] Determine auxiliary information at least partially based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining which of the multiple proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment; and directly or indirectly send the information of the multiple proposed target primary cells in the secondary cell group and the determined auxiliary information to the at least one target secondary node.

[0029] In some examples, the auxiliary information includes priority information of multiple proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by the user equipment.

[0030] In some examples, the auxiliary information includes information indicating the number of times the proposed target primary cell in the secondary cell group is the correct choice for conditional access by the user equipment.

[0031] In some examples, sending the information of multiple proposed target primary cells in the indicated secondary cell group and the determined auxiliary information includes: sending at least one SgNB change required message and / or at least one SgNB addition request message.

[0032] In some examples, the information of multiple proposed target primary cells in the indicated secondary cell group includes at least one cell identifier.

[0033] According to various but not necessarily all embodiments, an apparatus is provided that includes components for:

[0034] receiving information indicating a plurality of proposed target primary cells in a secondary cell group that are to be prepared by a target secondary node for conditional access by a 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 in the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment, wherein the assistance information is determined at least in part based on secondary radio link failure information associated with the target secondary node; and

[0035] determining at least one of the plurality of proposed target primary cells in the secondary cell group, the at least one target primary cell being to be prepared for conditional access by the user equipment, at least in part based on the received assistance information; and

[0036] sending to a master node conditional access configuration information indicating the determined at least one target primary cell in the secondary cell group.

[0037] In some examples, the assistance information includes priority information of a plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by the user equipment.

[0038] In some examples, the assistance information includes information indicating the number of times the proposed target primary cell in the secondary cell group is a correct selection for conditional access by the user equipment.

[0039] In some examples, receiving the information indicating the plurality of proposed target primary cells in the secondary cell group and the assistance information includes: receiving at least one SgNB addition request message.

[0040] In some examples, the assistance information is derived from a source master node or a source secondary node.

[0041] According to various but not necessarily all embodiments, a method is provided that includes:

[0042] receiving information indicating a plurality of proposed target primary cells in a secondary cell group that are to be prepared by a target secondary node for conditional access by a 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 in the secondary cell group is to be prepared by the at least one target secondary node for conditional access by the user equipment, wherein the assistance information is determined at least in part based on secondary radio link failure information associated with the target secondary node; and

[0043] Determine at least one target primary cell among the plurality of proposed target primary cells in a secondary cell group, at least partially based on the received assistance information, the at least one target primary cell to be prepared for conditional access by a user equipment; and

[0044] Send to a master node conditional access configuration information indicating the determined at least one target primary cell in the secondary cell group.

[0045] In some examples, the assistance information includes priority information of the plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by a user equipment.

[0046] In some examples, the assistance information includes information indicating the number of times that a proposed target primary cell in the secondary cell group is a correct selection for conditional access by a user equipment.

[0047] In some examples, receiving the information indicating the plurality of proposed target primary cells in the secondary cell group and the assistance information includes: receiving at least one SgNB addition request message.

[0048] In some examples, the assistance information is derived from a source master node or a source secondary node.

[0049] According to various but not necessarily all embodiments, there is provided a computer program including instructions for causing an apparatus to at least perform the following operations:

[0050] Receive information indicating that a plurality of proposed target primary cells in a secondary cell group are to be prepared by a target secondary node for conditional access by a user equipment and assistance information configured to assist the target secondary node in determining which of the plurality of proposed target primary cells in the secondary cell group is to be prepared by the at least one target secondary node for conditional access by a user equipment, wherein the assistance information is determined at least partially based on secondary radio link failure information associated with the target secondary node; and

[0051] Determine at least one target primary cell among the plurality of proposed target primary cells in the secondary cell group, at least partially based on the received assistance information, the at least one target primary cell to be prepared for conditional access by a user equipment; and

[0052] Send to a master node conditional access configuration information indicating the determined at least one target primary cell in the secondary cell group.

[0053] In some examples, the auxiliary information includes priority information of the plurality of proposed target primary cells in a secondary cell group for conditional access to be prepared by the at least one target secondary node for use by a user equipment.

[0054] In some examples, the auxiliary information includes information indicating the number of times that a proposed target primary cell in a secondary cell group is the correct choice for conditional access to be performed by a user equipment.

[0055] In some examples, receiving the information of the plurality of proposed target primary cells in the secondary cell group and the auxiliary information includes: receiving at least one SgNB addition request message.

[0056] In some examples, the auxiliary information is derived from a source primary node or a source secondary node.

[0057] According to various but not necessarily all embodiments, there is provided an apparatus, comprising:

[0058] at least one processor; and

[0059] at least one memory storing instructions which, when executed by the at least one processor, cause the apparatus to perform at least a portion of one or more methods disclosed herein.

[0060] According to various but not necessarily all embodiments, there is provided an apparatus including components for performing at least a portion of one or more methods disclosed herein.

[0061] According to various but not necessarily all embodiments, examples as claimed in the appended claims are provided.

[0062] Although the above examples and alternative features of the present disclosure are described separately, it should be understood that the present disclosure encompasses all possible combinations and permutations. It should be understood that various examples of the present disclosure may include any or all features described with respect to other examples of the present disclosure, and vice versa. Moreover, it should be understood that any one or more or all features in any combination may be implemented / included in / executable by an apparatus, a method, and / or computer program instructions as needed and appropriately.

[0063] The description of a function should also be considered to disclose any component suitable for performing that function. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Some examples will now be described with reference to the drawings, in which:

[0065] Figure 1 Examples of the subject matter described herein are shown;

[0066] Figure 2Shows another example of the subject matter described herein;

[0067] Figure 3A Shows another example of the subject matter described herein;

[0068] Figure 3B Shows another example of the subject matter described herein;

[0069] Figure 4 Shows another example of the subject matter described herein;

[0070] Figure 5 Shows another example of the subject matter described herein;

[0071] Figure 6 Shows another example of the subject matter described herein;

[0072] Figure 7A Shows another example of the subject matter described herein; and

[0073] Figure 7B Shows another example of the subject matter described herein.

[0074] The drawings are not necessarily to scale. For clarity and conciseness, certain features and views of the drawings may be shown schematically or enlarged in scale. For example, the dimensions of some elements in the figures may be enlarged relative to other elements to aid in illustration. Like reference numerals are used in the drawings to represent like features. For clarity, it is not necessary to show all reference numerals in all of the drawings.

[0075] Definition

[0076] Master Node (MN) : A network node that provides control plane connectivity towards the core network.

[0077] Master Cell Group (MCG) : A cell group associated with the MN, including the PCell and one or more SCell.

[0078] Secondary Node (SN) : A network node that provides additional radio resources for the UE instead of the MN.

[0079] Secondary Cell Group (SCG) : A cell group associated with the SN, including the PSCell and one or more SCell.

[0080] PCell : A cell for the uplink / downlink connection to the MN. A cell of the MCG for initiating the initial access to the MN.

[0081] PSCell:The cell for the uplink / downlink connection to the SN. The cell of the SCG used to initiate the initial access to the SN.

[0082] Conditional Handover (CHO ) - A handover procedure triggered by the UE only when the (one or more) configured execution conditions are met for the prepared candidate cells. The (one or more) conditions are pre-configured by the network. In 3GPP, the conditional handover execution conditions are specified by the CondExecutionCond within the CondReconfigurationToAddModList information element within the CondReconfiguration information element within the RRCReconConfiguration message.

[0083] Dual Connectivity (DC):

[0084] The UE is connected to the MN and the SN simultaneously. This is the operating mode of the UE in RRC_CONNECTED, which is configured with a primary cell group and a secondary cell group.

[0085] Configuration Information:

[0086] Information for configuring the operation of the UE. In 3GPP, the configuration information can be provided, for example, in the RRCReConfiguration message.

[0087] The term "configuration information includes" an entity (e.g., the handover execution condition for the primary cell; the SN addition condition for the dual connectivity with the primary cell, etc.) can mean that the configuration information includes the information sufficient to obtain that entity. It may or may not include all the parameters of the entity. It may alternatively include a pointer to the entity or the parameters of the entity, or it may mean that the configuration includes the entity.

[0088] In 3GPP, the RRCReconConfiguration message specifies the ConditionalReconfiguration information element, which sets the additional conditions for DC. The ConditionalReconfiguration information element includes the CondReconfigToAddModList information element. The CondReconfigToAddModList information element includes CondExecutionCond and CondRRCReconfig. The (one or more) additional conditions for the primary secondary cell (PSCell) are specified by CondExecutionCond. The RRCReconfig message to be applied when the specified conditions are met is set by CondRRCReconfig.

[0089] Measurement Configuration

[0090] Configuration information for configuring a UE to perform one or more measurements. In 3GPP, measurement configuration can be provided, for example, in an RRCReConfiguration message. The term "[entity] measurement configuration" (e.g., serving cell measurement configuration) can mean a measurement configuration prepared by an entity.

[0091] It may include one or more measurement objects and one or more reporting configurations associated by one or more measurement identities.

[0092] It may include a MeasConfig information element as defined in TS 38.331. Detailed implementation

[0093] Figure 1 An example of a network 100 including a plurality of network nodes is shown. The network nodes include a terminal node 110, an access node 120, and one or more core nodes 129. The terminal node 110 communicates with the access node 120. The one or more core nodes 129 communicate with the access node 120.

[0094] In this example, the network 100 is a radio telecommunications network, where at least some of the terminal node 110 and the access node 120 communicate with each other using transmission / reception of radio waves / signals.

[0095] In some examples, the one or more core nodes 129 can communicate with each other. In some examples, the one or more access nodes 120 can communicate with each other.

[0096] The network 100 can be a cellular network including a plurality of cells 122, each cell being served by an access node 120. In this example, the interface between the terminal node 110 and the access node 120 defining the cell 122 is a wireless interface 124.

[0097] The access node 120 is a cellular radio transceiver. The terminal node 110 is a cellular radio transceiver.

[0098] In the example shown, the cellular network 100 is a 3rd Generation Partnership Project (3GPP) network, where the terminal node 110 is a user equipment (UE) and the access node 120 is a base station.

[0099] In an example, network 100 is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN includes E-UTRAN Node B (eNB) 120, which provides E-UTRA user plane and control plane (RRC) protocol termination towards UE 110. The eNBs 120 are interconnected with each other via the X2 interface 126. The eNBs are also connected to the Mobility Management Entity (MME) 129 via the S1 interface 128.

[0100] In other examples, network 100 is a Next Generation (or New Radio NR) Radio Access Network (NG-RAN). The NG-RAN includes gNodeB (gNB) 120, which provides user plane and control plane (RRC) protocol termination towards UE 110. The gNBs 120 are interconnected with each other via the Xn interface 126. The gNBs are also connected to the Access and Mobility Management Function (AMF) via the N2 interface 128.

[0101] In an example, network 100 may include a combination of E-UTRAN and NG-RAN.

[0102] The user equipment may include a mobile device. A reference to the user equipment includes and, wherever possible, encompasses a reference to the mobile device.

[0103] UE 168 may perform a handover procedure to change the serving cell of UE 168. In an example, the handover procedure may be a conditional handover procedure.

[0104] The Conditional Handover (CHO) procedure may be considered a handover triggered by UE 168 when one or more handover execution conditions are met. The handover execution conditions may be pre-configured by network 100.

[0105] In an example, dual connectivity (DC) may be used to provide additional radio resources to UE 168.

[0106] In DC, the set of configurations for the serving cells of UE 168 has two subsets: the Master Cell Group (MCG) that includes the serving cells of the Master Node (MN) 172, and the Secondary Cell Group (SCG) that includes the serving cells of the Secondary Node (SN) 170.

[0107] In an example, a conditional change of the primary cell of the Secondary Cell Group (PSCell) may be configured. UE 168 may be configured with execution conditions for performing an SN change to one or more target SNs 166. Thus, UE 168 may be configured to conditionally access one or more target SNs 166.

[0108] In an example, at least one target SN 166 may be configured to efficiently and / or intelligently prepare at least one target PSCell and may efficiently and / or intelligently prepare at least one target PSCell for conditional access by UE 168.

[0109] Figure 2 An example of method 200 is shown.

[0110] In an example, Figure 2 may be considered to show multiple methods. For example, Figure 2 shows one or more actions at multiple actors / entities. In an example, Figure 2 may be considered to illustrate multiple methods performed by actors / entities.

[0111] Regarding Figure 2 One or more features discussed may be found in one or more other figures.

[0112] In Figure 2 's example, multiple devices send and / or receive one or more signals and / or one or more messages over and / or via and / or using a network. In an example, any suitable form of communication in any suitable network may be used. For example, Figure 1 at least a portion of network 100 may be used.

[0113] Thus, in an example, Figure 2 the multiple devices in form at least a portion of network 100 as described regarding Figure 1 above.

[0114] In the illustrated example, the terminal node 110 and three access nodes 120 send and / or receive one or more signals and / or one or more messages. In Figure 2 's example, the terminal node 110 is UE 168, and the three access nodes 120 are the source MN 172, the source SN 172, and the target SN 166.

[0115] In Figure 2 's example, UE 168 has dual connectivity with the source MN 172 and the source SN 170.

[0116] In an example, Figure 2 communication and / or transmission between the elements shown in may occur via any number of intermediate elements, including none.

[0117] Although one UE 168 is shown in Figure 2 's example, in an example, any suitable number of UE 168 may be included.

[0118] Similarly, any suitable number of network nodes may be included in the example.

[0119] In the example, method 200 and / or at least a part of method 200 may be considered as a method for enhancing conditional access to the target SN.

[0120] In the example, method 200 and / or at least a part of method 200 may be considered as a method for enhancing the selection of at least one target PSCell for conditional access by the UE.

[0121] In the example, method 200 and / or at least a part of method 200 may be considered as a method for providing auxiliary information to the target SN to assist in the selection of at least one target PSCell for conditional access by the UE.

[0122] In the illustrated example, the position of the block indicates the entity that performs the action. For example, block 202 is performed at / by the source SN 170.

[0123] In the example, method 200 is part of a method for configuring, and / or allowing, and / or enabling the 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 may be part of a conditional PSCell change (CPC) method / process / procedure or a conditional PSCell addition (CPA) method / process.

[0124] In some examples, method 200 may be considered SN-initiated. That is, in some examples, method 200 may be initiated by the source SN 170. For example, method 200 may be part of an SN-initiated CPAC method / process / procedure.

[0125] In the illustrated example, method 200 is SN-initiated, and blocks 202, 204, and 206 are performed at / by the source SN 170, and block 208 involves the source SN 170.

[0126] In some examples, method 200 may be considered MN-initiated. That is, 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.

[0127] In such an example, blocks 202, 204, and 206 are performed at / by the source MN 172, and block 208 is performed at / by the source MN 172.

[0128] At block 202, method 200 includes receiving secondary radio link failure (S-RLF) information 164, where the S-RLF information indicates a situation of a failure in a secondary radio link between UE 168 and at least one source SN 170 when UE 168 is configured to conditionally access at least one target SN 166, and UE 168 is having dual connectivity with source MN 172 and source SN 170.

[0129] In some examples, method 200 includes receiving secondary radio link failure (S-RLF) information 164 associated with at least one target secondary node 166, where the S-RLF information indicates a situation of a failure in a secondary radio link between UE 168 and at least one source SN 170 when UE 168 is configured to conditionally access the at least one target SN 166, and UE 168 is having dual connectivity with source MN 172 and source SN 170.

[0130] Since Figure 2 illustrates one or more actions of receiving, e.g., one or more signals, Figure 2 also illustrates corresponding transmit / make transmit features / actions.

[0131] Similarly, for any transmit / make transmit (one or more) features / (one or more) actions, Figure 2 also illustrates corresponding receive / make receive (one or more) features / (one or more) actions.

[0132] For example, from the perspective of UE 168, block 202 can be considered to illustrate transmitting S-RLF information 164.

[0133] In some examples, S-RLF information 164 can be considered as secondary cell group (SCG) failure information.

[0134] Receiving S-RLF failure information 164 can be performed in any suitable way using any suitable method. In an example, receiving S-RLF information 164 includes receiving one or more signals and / or messages.

[0135] In an example, S-RLF information 164 can be received from any suitable number of different UEs 168. Thus, in an example, S-RLF information 164 indicates a situation of a failure in a secondary radio link experienced by multiple different UEs.

[0136] In some examples, at block 202, method 200 includes receiving secondary radio link failure (S-RLF) information 164, where the S-RLF information indicates a situation of a failure in a secondary radio link between a plurality of UEs 168 and at least one source SN 170 when the plurality of UEs 168 are configured to conditionally access at least one target SN 170, and the plurality of UEs 168 are having dual connectivity with a source MN 172 and the source SN 170.

[0137] The S-RLF information 164 can be received and / or collected over any suitable time period. For example, the S-RLF information 164 can be received from the plurality of UEs 168 over a long enough time period that is long enough to allow reception of sufficient S-RLF information 164 to permit execution of method 200. For example, the S-RLF information 164 can be received over a long enough time period to allow reception of sufficient S-RLF information 164 to permit determination of secondary information 176 at block 206.

[0138] In an example, the time period can be 2 to 3 hours, half a day, one day, 2 to 3 days, one week, 2 to 3 weeks, one month, and so on.

[0139] In an example, the S-RLF information 164 can be received during a key performance indicator (KPI) collection period.

[0140] The S-RLF information 164 can include any suitable information. For example, the S-RLF information 164 can include any suitable information indicating a situation of a failure in a secondary radio link between a UE 168 and at least one source SN 170 when the UE 168 is configured to conditionally access at least one target SN 166, and the UE 168 is having dual connectivity with a source MN 172 and the source SN 170.

[0141] For example, the S-RLF information 164 can include any suitable information that allows determination of the secondary information 176 at block 206.

[0142] 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 of a connection to a PSCell of the source SN 170.

[0143] The S-RLF information 164 can include a failure type (e.g., due to a downlink or uplink radio problem), and / or location information of the UE 168, and / or received signal power information, and / or time information, and / or information about the configuration of the UE 168, and so on.

[0144] In Figure 2In the example, method 200 is initiated by the SN, and the S-RLF information 164 is sent from the UE 168 to the source MN 172 and forwarded by the source MN 172 to the source SN 170.

[0145] However, in the example initiated by the MN, the S-RLF information 164 can be sent from the UE 168 to the source MN 172 without forwarding the S-RLF information 164 to the source SN 170, and block 202 is performed at / by the source MN 172.

[0146] In the example, the S-RLF information 164 is associated with at least one target SN 166 and indicates a situation of a failure in the secondary radio link between the UE 168 and at least one source secondary node 170 when the UE 168 is configured to conditionally access at least one target SN 166.

[0147] The S-RLF information 164 can be considered to be associated with the target SN 166 because the S-RLF information 164 is generated due to a secondary radio link failure that occurs when the UE 168 is configured to conditionally access the target SN 166.

[0148] The situation of a failure in the secondary radio link can be considered a failure condition in the secondary radio link.

[0149] The situation of a failure in the secondary radio link can be considered the setting and / or circumstances of a failure in the secondary radio link.

[0150] The situation of a failure in the secondary radio link can be considered the radio situation and / or physical situation that the UE 168 experiences during a period of time before the S-RLF.

[0151] Any appropriate period of time can be used. For example, any appropriate period of time that sufficiently covers the situation of the S-RLF can be used.

[0152] For example, a period of time in the range of 5 seconds to 30 minutes can be used.

[0153] For example, a period of time in the range of 30 seconds to 20 minutes can be used.

[0154] For example, a period of time in the range of 1 minute to 15 minutes can be used.

[0155] For example, a period of time in the range of 5 minutes to 10 minutes can be used.

[0156] In the example, the period of time can be at least M seconds, where M is a positive integer.

[0157] In the instance, the period of time can be at least X minutes, where X is a positive integer.

[0158] As an example, refer to Figure 3A the example of

[0159] Figure 3A Fig. 3 shows an example scenario. In the example of Fig. 3, the UE 168 is located within and being served by the source PSCell 188.

[0160] In the example shown, the UE 168 moves along the trajectory 196, and as the UE 168 moves along the trajectory 196, the UE detects two PSCells: PSCell1 190 and PSCell2 192.

[0161] Figure 3B Fig. 4 shows the reference signal received power (RSRP) curves of the source PSCell 188, PSCell1 190, and PSCell2 192 when the UE 168 moves along the trajectory 196 as shown in the example of Figure 3A Fig. 3.

[0162] Regarding Figure 3B the curve shown in the example of

[0163] Fig. 4, at time t1, PSCell1 190 reaches a measurable signal strength that meets the RSRP offset 194 configured at the UE 168, and triggers the preparation of PSCell1 190 as a candidate cell for conditional access by the UE 168, such as CPC.

[0164] At time t2, PSCell2 192 also meets the RSRP offset 194 preparation criterion at the UE 168, and a measurement event report is sent from the UE 168 to the source PSCell 188, which in turn triggers, for example, an SgNB (conditional) change required message to the MN, and an SgNB (conditional) addition request message from the MN to the target SN, which includes the measurement results of the target PSCell1 190 and PSCell2 192.

[0165] However, later in Figure 3B the example of

[0166] In the example shown, the target SN missed the preparation for target PSCell2 192, which led to S-RLF in the source PSCell188 because the conditional access execution criteria for the prepared PSCell1 190 were not met.

[0167] Figure 3A and Figure 3B can be considered to show the situation of S-RLF experienced by UE 168. In the example of Figure 3, the S-RLF information 164 includes information indicating the situation, such as UE trajectory 196, and / or RSRP measurement, and / or timing, and / or UE configuration, etc.

[0168] In Figure 3A and 3B 's example, the information included in the S-RLF information 164 can indicate that the target PSCell2 192 should have been prepared in this situation (because it had the best measurement when the S-RLF occurred).

[0169] However, in this example, based on the information available at this time, the target SN 166 decides the cell to be prepared as a candidate for conditional access as UE 196, for example, a candidate for CPAC. In addition, the number of cells that can be prepared may be limited.

[0170] Return Figure 2 's example, in the example, the S-RLF information 164 indicates a situation of a failure in the secondary radio link between the UE 168 and at least one source secondary node 170 when the UE 168 is configured to conditionally access at least one target SN 166.

[0171] The UE 168 can be configured to use any suitable method to conditionally access at least one target SN 166 in any suitable manner. For example, the UE 168 can receive any suitable configuration information to configure the UE 168 to access at least one target SN 166 when at least one criterion is met.

[0172] In the example, the UE 168 is configured with at least one CPAC configuration. For example, the UE 168 can be configured with at least one CPC or CPA configuration.

[0173] In the example, accessing a PSCell or any other suitable cell includes performing a random access procedure with that cell.

[0174] In the example, accessing a PSCell or any other suitable cell includes establishing a connection with that cell.

[0175] In an example, the source SN 170 or the source MN 172 in an MN-initiated example may determine statistics at least in part based on the received S-RLF information 164. For example, the source SN 170 or the source MN 172 in an MN-initiated example may determine statistics based on a large number of failed target PSCell preparations observed via the S-RLF information 164, see for example Figure 3A and 3B .

[0176] In an example, this may be done until statistical convergence is achieved.

[0177] At block 204, method 200 includes determining a plurality of proposed target PSCs 174 to be prepared by at least one target secondary node 166 for conditional access by UE 168.

[0178] Determining the plurality of proposed target PSCs 174 to be prepared by 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 PSCs 174 at block 204 may be performed as part of a CPAC method / process / procedure, such as part of a CPC method / process / procedure or a CPA method / process / procedure.

[0179] In an example, the target SN 166 cannot prepare a PSCell not included in the proposed target PSCs 174 for conditional access by UE 168.

[0180] In an example, the source SN 170, or the source MN 172 in an MN-initiated example, may determine that UE 168 may need a change on the PSCell and perform block 206 at least in part based on that determination. For example, the source SN 170 (or the source MN 172) may receive at least one measurement report from UE 168 and determine that UE 168 may need a change on the PSCell at least in part based on the received at least one measurement report.

[0181] UE 168 may be a UE 168 from which S-RLF information 164 has been received, or may be a UE 168 from which S-RLF information 164 has not been received.

[0182] In some examples, the source SN 170 (or the source MN 172) determines the (one or more) conditional access execution conditions for each of the plurality of proposed target PSCs 174. For example, the source SN 170 (or the source MN 172) may determine the CPAC execution conditions for each of the plurality of proposed target PSCs 174, such as CPC or CPA execution conditions.

[0183] In some examples, the source SN 170 (or the source MN) determines the maximum number of target PSCs that the target SN 166 can prepare. Thus, in an embodiment, the target SN will prepare a limited number of target PSCs from among the plurality of proposed target PSCs 174.

[0184] At block 206, method 200 includes determining auxiliary information 176 based at least in part on the received S-RLF information 164, wherein the auxiliary information assists and / or is configured to assist at least one target SN 166 in determining which of the plurality of proposed target PSCs 174 will be prepared by the at least one target SN 166 for conditional access by the UE 168.

[0185] Block 206 can be performed in any suitable manner using any suitable method. In an example, the received S-RLF information 164 can be used in any suitable manner to determine the auxiliary information 176.

[0186] For example, the S-RLF information 164 can be processed and / or analyzed in any suitable manner to allow determination of the auxiliary information 176. For example, statistics determined from the S-RLF information 164 can be used to determine the auxiliary information 174.

[0187] Thus, in an example, determining the auxiliary information 176 based at least in part on the received S-RLF information 164 includes: determining the auxiliary information 176 based at least in part on an analysis of the received S-RLF information 164 and / or statistics determined from the received S-RLF information 164.

[0188] For example, with respect to the example of FIG. 3, the determined auxiliary information 176 is configured to assist the UE 168 in preparing candidate PSCell 2192, rather than candidate PSCell 1 190, for conditional access by the UE 168.

[0189] In some examples, determining the auxiliary information includes using a mobility robustness optimization algorithm, and / or artificial intelligence, and / or one or more machine learning techniques.

[0190] The auxiliary information 176 can include any suitable information in any suitable form. For example, the auxiliary information 176 can include any suitable information to assist at least one target SN 166 in determining at least which of the plurality of proposed target PSCs 174 will be prepared by the at least one target SN 166 for conditional access by the UE 168.

[0191] In an example, the assistance information 176 may include any suitable information for indicating to the target SN that, compared with at least one other PSCell among the multiple proposed target PSCs 174, at least one target PSCell among the multiple proposed target PSCs 174 will be preferentially prepared.

[0192] In an example, the assistance information may include any suitable information for indicating the sorting of the multiple proposed target PSCs 174 for being prepared by at least one target SN 166 for conditional access by the UE 168.

[0193] In some examples, the assistance information 176 includes priority information of the multiple proposed target PSCs 174 for being prepared by at least one target SN 166 for conditional access by the UE 168.

[0194] The priority information may be considered as information indicating that the target SN 166 will prioritize the preparation of at least one specific proposed target PSCell 174 over the preparation of at least one other proposed target PSCell among the multiple proposed target PSCs 174.

[0195] For example, the priority information may indicate to the target SN 166 in the example of Figure 3 that the target PSCell 2 192 is to be prepared for conditional access by the UE 168 prior to the target PSCell 1 190.

[0196] The priority information may include any suitable information in 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 specific proposed target PSCell 174 is prioritized over at least one other proposed target PSCell among the multiple proposed target PSCs 174.

[0197] In an example, the priority information may include values associated with each of the multiple proposed target PSCs 174, which indicate the priorities of the associated target PSCs. For example, the priority information may include values between 0 and 100 for the multiple proposed PSCs 174, where, for example, 0 indicates the lowest priority and 100 indicates the highest priority.

[0198] In some examples, the assistance information 176 includes information indicating the number of times the proposed target PSCell 174 is the correct choice for conditional access by the UE 168.

[0199] In an example, information indicating the number of times that a proposed target PSCell 174 is the correct choice for conditional access by the UE 168 can include any suitable information in any suitable form. For example, information indicating the number of times that a proposed target PSCell 174 is the correct choice for conditional access by the UE 168 can indicate that number in absolute or relative terms.

[0200] For example, the information can indicate the number of times that each of a plurality of proposed target PSCells 174 is the correct choice, and / or can indicate the percentage of the number of times that each of a plurality of proposed target PSCells 174 is the correct choice.

[0201] If, in the case of S-RLF, conditional access by the UE 168 to a target PSCell would prevent S-RLF, the target PSCell can be considered the correct choice for conditional access by the UE 168.

[0202] For example, in the example of Figure 3, PSCell2 192 can be considered the correct choice for conditional access by the UE 168 because, in the case of an S-RLF failure in the example of Figure 3, if the UE 168 is configured to conditionally access PSCell2 192, S-RLF will be prevented.

[0203] At block 208, method 200 includes sending, directly or indirectly, information 178 indicating a plurality of proposed PSCells 174 and determined assistance information 176 to at least one target SN 166.

[0204] Thus, Figure 2 A method 200 is shown that includes:

[0205] Receiving secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between the user equipment 168 and at least one source secondary node 172 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and a source secondary node 170;

[0206] Determining a plurality of proposed target primary cells in a secondary cell group 174 to be prepared by the at least one target secondary node for conditional access by the user equipment 168;

[0207] Determine the auxiliary information 176 at least partially based on the received secondary radio link failure information 164, wherein the auxiliary information 176 assists the at least one target secondary node 166 in determining which of the multiple proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0208] Send, directly or indirectly, the information 178 indicating the multiple proposed target primary cells of the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0209] The information 178 indicating the multiple proposed PSCs 174 and the determined auxiliary information 176 may include any suitable information.

[0210] In some examples, the information 178 indicating the multiple proposed target PSCs 174 includes at least one cell identifier, such as at least one physical cell identifier (PCI), and / or at least one global cell identifier, and so on.

[0211] Any suitable method may be used to perform block 208 in any suitable manner. In an example, sending the information 178 at block 208 includes sending at least one signal and / or message.

[0212] In some SN-initiated examples, at block 208, the information 178 is sent from the source SN 170 to the source MN 172 and forwarded by the source MN 172 to the at least one target SN 166.

[0213] In some MN-initiated examples, at block 208, the information 178 is sent from the source MN 172 to the at least one target SN 166.

[0214] In some examples, sending the information 178 indicating the multiple proposed target PSCs 174 and the determined auxiliary information 176 includes sending at least one SgNB change required message and / or at least one SgNB addition request message.

[0215] In an example, from the perspective of the target SN 166, block 208 includes information 178 of the target PSCell 174 that receives indications of multiple suggestions for the target PSCell 174 to be prepared by the target SN 166 for conditional access by the UE 168, and assistance information 176 that is configured to assist the target SN 166 in determining at least which one of the multiple suggested target PSCs will be prepared by at least one target SN 166 for conditional access by the UE 168, where the assistance information 176 is determined at least in part based on the S-RLF information 164 associated with the target SN 166.

[0216] In an example, from the perspective of the target SN 166, the information 178 that receives indications of the multiple suggested target PSCs 174 and the assistance information 176 includes receiving at least one SgNB addition request message.

[0217] In an example, the assistance information 176 is derived from the source MN 172 or the source SN 170.

[0218] In block 210, method 200 includes determining, at least in part based on the received assistance information 176, at least one target PSCell among the multiple suggested target PSCs 174 that will be prepared for conditional access by the UE 168.

[0219] Block 210 can be performed using any suitable method in any suitable manner.

[0220] In an example, the assistance information 176 can be used in any suitable way to assist the target SN 166 in determining at least which one of the multiple suggested target PSCs 174 will be prepared for conditional access by the UE 168.

[0221] In some examples, the assistance information 176 is used by the target SN 166 to determine at least which one of the multiple suggested target PSCs 174 should be preferentially prepared for conditional access by the UE 168 compared to at least one other PSCell among the multiple suggested target PSCs 174.

[0222] In an example, the target SN 166 can determine, at least in part based on the assistance information 176, at least which one of the multiple suggested target PSCs 174 has the highest one or more priorities for being prepared for conditional access by the UE 168.

[0223] For example, in at least some examples where the auxiliary information 176 includes priority information, the target SN 166 may determine which one or more of the multiple proposed target PSCs 174 have the highest one or more associated priority values.

[0224] For example, in at least some examples where the auxiliary information includes information indicating the number of times the proposed target PSC 174 is the correct choice for conditional access by the UE 168, the target SN 166 may determine which one or more of the multiple proposed PSCs 174 have the highest associated number of times.

[0225] For example, with respect to Figure 3A an example, the auxiliary information 176 may include a priority value 80 for PSCell2 192 and a priority value 20 for PSCell1 190, thereby assisting the target SN 166 to preferentially prepare PSCell2 192 for conditional access by the UE 168, thus avoiding S-RLF.

[0226] In an example, the target SN 166 may prepare at least one determined target PSC from among the multiple proposed target PSCs 174 for conditional access by the UE 168. The target SN 166 may prepare at least one determined target PSC from among the multiple proposed target PSCs 174 for CPAC (e.g., CPC or CPA).

[0227] In an example, the target SN 166 may prepare conditional access configuration information 186 for at least one determined target PSC from among the multiple proposed target PSCs 174.

[0228] The conditional access configuration information 186 may include any appropriate information. For example, the conditional access configuration information 186 may include any appropriate information for configuring the UE 168 to access at least one determined target PSC from among the multiple proposed target PSCs 174 when at least one criterion is met.

[0229] 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.

[0230] In some examples, the conditional access configuration information 186 includes CPAC configuration for each of the at least one determined target PSCs from among the multiple proposed target PSCs 174, such as CPA or CPC configuration.

[0231] At block 210, method 200 includes sending conditional access configuration information 186 indicating the determined at least one target PSCell to MN 172. In an embodiment, the determined at least one target PSCell is the at least one target PSCell determined in block 210.

[0232] Accordingly, Figure 2 A method 200 is shown, including:

[0233] Receiving information 178 indicating a plurality of proposed target primary cells in secondary cell group 174 that will be prepared by target secondary node 166 for conditional access by user equipment 168, and assistance information 176 configured to assist target secondary node 166 in determining which at least one of the plurality of proposed target primary cells in secondary cell group 174 will be prepared by at least one target secondary node 166 for conditional access by user equipment 168, wherein the assistance information 176 is determined at least in part based on secondary radio link failure information 164 associated with target secondary node 166; and

[0234] Determining, at least in part based on the received assistance information 176, at least one target primary cell among the plurality of proposed target primary cells in secondary cell group 174 that will be prepared for conditional access by user equipment 168; and

[0235] Sending conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to primary node 172.

[0236] In an example, the conditional access configuration information 186 may be considered to be the conditional access configuration information 186 of and / or for the determined at least one target PSCell.

[0237] Block 210 may be performed in any suitable method and in any suitable manner. In an example, sending conditional access configuration information 186 indicating the determined at least one target PSCell to MN 172 includes: sending at least one signal and / or message.

[0238] In some examples, target SN 166 sends an identifier of the prepared target PSCell to MN 172, such as a cell identifier, such as a physical cell identifier (PCI), and / or a global cell identifier, etc.

[0239] In an example, method 200 may then proceed according to a conditional access method / procedure / rule to configure the UE to conditionally access target SN 165 at least in part based on the information sent at block 212.

[0240] For example, method 200 can then be carried out according to the CPAC method / process / procedure (such as the CPA or CPC method / process / procedure). For example, see Figure 6 .

[0241] In an example, method 200 can be repeated any appropriate number of times.

[0242] As previously mentioned, the example can utilize one or more mobility robustness optimization algorithms. In this regard, a self-organizing network (SON) is a network capable of automatically adjusting radio network parameters based on statistics collected from the network. Mobility robustness optimization (MRO) is an example of SON, in which SON processes the adjustment of parameters for controlling cell changes (such as changes in the PSCell).

[0243] In MRO, in an example, the network collects statistics (fault reports can be one of them) for a certain period of time (such as represented by a KPI collection period). For example, in each KPI collection period, the KPI statistics are processed by the network, and a decision is made to make a change. The network applies these changes to, for example, auxiliary information, and uses these changes to collect new statistics in a new KPI collection period.

[0244] This process can be repeated by the network until it reaches a KPI collection cycle where it decides that nothing needs to be done (for example, the problem is solved or it is no longer possible to adjust the threshold / offset).

[0245] In this case, it can be considered that MRO has converged. In an example, the values of the performance metrics collected in each KPI collection period should be statistically significant (a large amount of statistics) to have a reliable network decision when making changes.

[0246] The examples of the present disclosure are advantageous and provide technical benefits.

[0247] For example, the examples of the present disclosure allow the target SN to select an appropriate target PSCell among the proposed target PSCs.

[0248] For example, the examples of the present disclosure reduce radio link failures caused by preparing incorrect candidate PSCs.

[0249] Figure 4 An example of method 400 is shown.

[0250] In an example, method 400 can be performed by any suitable device including any suitable components for performing method 400. For example, as described with respect to Figure 7A and / or the device described in 7B.

[0251] In an example, method 400 may be performed by a source SN 170 (e.g., Figure 2 the source SN).

[0252] In an example, method 400 may be performed by a source MN 172 (e.g., Figure 2 the source MN).

[0253] At block 402, method 400 includes receiving secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between a user equipment 168 and at least one source secondary node 170 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and the source secondary node 170.

[0254] At block 404, method 400 includes determining a plurality of proposed target primary cells in a secondary cell group 174 that will be prepared by at least one target secondary node 166 for conditional access by the user equipment 168.

[0255] At block 406, method 400 includes determining auxiliary information 176 at least partially based on the received secondary radio link failure information 164, where the auxiliary information 176 assists at least one target secondary node 166 in determining which of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by at least one target secondary node 166 for conditional access by the user equipment 168.

[0256] At block 408, method 400 includes directly or indirectly sending information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to at least one target secondary node 166.

[0257] Thus, Figure 4 is shown a method 400, including:

[0258] receiving secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between a user equipment 168 and at least one source secondary node 170 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and the source secondary node 170;

[0259] determining a plurality of proposed target primary cells in a secondary cell group 174 that will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168;

[0260] Determine the auxiliary information 176 at least in part based on the received secondary radio link failure information 164, wherein the auxiliary information 176 assists the at least one target secondary node 166 in determining which of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0261] Send, directly or indirectly, the information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0262] Figure 5 Shows an example of method 500.

[0263] In an example, method 500 can be performed by any suitable device including any suitable components for performing method 500. For example, as described with respect to Figure 7A and / or the device described in 7B.

[0264] In an example, method 500 can be performed by the target SN 166 (e.g., Figure 2 the target SN 166).

[0265] In block 502, method 500 includes receiving the information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 that will be prepared by the target secondary node 166 for conditional access by the user equipment 168, and the auxiliary information 176 configured to assist the target secondary node 166 in determining which of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the auxiliary information 176 is determined at least in part based on the secondary radio link failure 164 information associated with the target secondary node 166.

[0266] In block 504, method 500 includes determining at least one target primary cell in the plurality of proposed target primary cells in the secondary cell group 174, at least in part based on the received auxiliary information 176, the at least one target primary cell to be prepared for conditional access by the user equipment 168.

[0267] In block 506, method 500 includes sending the conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to the primary node 172.

[0268] Therefore, Figure 5 Shows method 500, including:

[0269] Receive information 178 of the target primary cell of a plurality of suggestions in the secondary cell group 174 that will be prepared by the target secondary node 166 for conditional access by the user equipment 168, and auxiliary information 176 configured to assist the target secondary node 166 in determining at least which one of the plurality of suggested target primary cells in the secondary cell group 174 will be prepared by at least one target secondary node 166 for conditional access by the user equipment 168, wherein the auxiliary information 176 is determined at least in part based on the secondary radio link failure 164 information associated with the target secondary node 166;

[0270] Determine, at least in part based on the received auxiliary information 176, at least one target primary cell among the plurality of suggested target primary cells in the secondary cell group 174, the at least one target primary cell being prepared for conditional access by the user equipment 168; and

[0271] Send conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to the master node 172.

[0272] Figure 6 Illustrates an example of method 600.

[0273] Some examples relate to a 3rd Generation Partnership Project (3GPP) network. Figure 6 May be considered to illustrate some such examples.

[0274] The following description may be considered to illustrate some such examples.

[0275] In Figure 6 's example, multiple devices send and / or receive one or more signals and / or one or more messages via and / or 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.

[0276] Thus, in the example, Figure 6 the multiple devices in form at least a portion of network 100 as described with respect to Figure 1 .

[0277] In the illustrated example, the terminal node 110 and four or more access nodes 120 send and / or receive one or more signals and / or one or more messages. In Figure 6 's example, the terminal node 110 is the UE 168, and the four or more access nodes 120 are the source MN 172, the source SN 170, the target SN 166, and the (one or more) other potential target nodes 166n.

[0278] In Figure 6 example, UE 168 has dual connectivity with source MN 172 and source SN 170.

[0279] In the example, Figure 6 communications and / or transmissions between the elements shown in

[0280] Although one UE 168 is shown in the Figure 6 example, any suitable number of UEs 168 may be included in the example.

[0281] Similarly, any suitable number of network nodes may be included in the example.

[0282] Figure 6 A high-level flowchart is shown in

[0283] Block 1: The source SN uses the SCG failure information report received from the UE to collect information / statistics on the "faulty CPC preparation list" and updates its priority / information that will be sent to other nodes in case of an SN change.

[0284] Aspect 1:

[0285] · Block 2: The source SN initiates an inter-SN PSCell change by indicating to the target SN that the preparation for a specific target PSCell is to be prioritized over other PSCs and providing a priority for each proposed target PSCell.

[0286] · Block 3 / 4: The MN forwards the received priority together with the SgNB addition request to the

[0287] target SN.

[0288] Aspect 2: Note that this aspect may be implemented as a supplement to Aspect 1 or independently.

[0289] · Block 5: The source SN initiates an inter-SN PSCell change by indicating to the target SN information about the likelihood of success of the correct PSCell for each proposed target PSCell. This number may be an absolute number or a percentage.

[0290] · Block 6 / 7: The MN forwards the received information together with the SgNB addition request to the (one or more) target SNs.

[0291] Block 8 / 9: When the target SN / (one or more) other potential target nodes select a target PSCell for CPC configuration, they prioritize the target PSCell with high priority or high success probability indicated by the source SN.

[0292] · In block 10 / 11, the target SN sends the CPC configuration for each prepared target PSCell and the ID of the (one or more) prepared target PSCs to the MN.

[0293] · In block 12, the MN sends a conditional (re)configuration to the UE, which includes the CPC configuration of the (one or more) candidate target PSCs and the CPC execution condition.

[0294] · In block 13, the UE sends a message to the MN to confirm the reception of the conditional configuration, and the MN in turn confirms the SN change preparation to the source SN in block 14.

[0295] · In block 15, the UE estimates the CPC execution condition of the (one or more) prepared target PSCs.

[0296] · In block 16, the CPC execution condition is met, such as a PSCell candidate in target SN 1.

[0297] · In block 17, the UE sends a message indicating the execution of the CPC configuration to the MN. The message includes the RRC reconfiguration completion for the embedded SN of target SN

[0298] 1, which is sent to target SN 1 in block 18.

[0299] · In block 19, the UE completes random access.

[0300] Figure 7A FIG. illustrates an example of apparatus 130. Apparatus 130 may be a controller of the apparatus of a device, such as a terminal node 110 (e.g., UE 168), or a network element 172, 170, and / or 166 (e.g., eNB or gNB). Apparatus 130 may be considered a controller.

[0301] The implementation of 130 may be as a controller circuit. Controller 130 may be implemented solely in hardware, with certain aspects of software including separate firmware, or may be a combination of hardware and software (including firmware).

[0302] As Figure 7AAs shown, the controller 130 can be implemented using instructions, which implement hardware functions, for example, by using executable instructions of a computer program 136 in a general-purpose or special-purpose processor 132. The executable instructions can be stored on a computer-readable storage medium (disk, memory, etc.) for execution by such a processor 132.

[0303] The processor 132 is configured to read from and write to the memory 134. The processor 132 may also include an output interface and an input interface. The processor 132 outputs data and / or commands via the output interface and inputs data and / or commands into the processor 132 via the input interface.

[0304] The memory 134 stores a computer program 136 including computer program instructions (computer program code). When the computer program instructions are loaded into the processor 132, they control 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 execute the methods shown in the drawings. The processor 132 can load and execute the computer program 136 by reading the memory 134.

[0305] In an example, the device 130 includes:

[0306] at least one processor 132; and

[0307] at least one memory 134 including computer program code,

[0308] The at least one memory 134 and the computer program code are configured to, together with the at least one processor 132, cause the device 130 to at least perform:

[0309] Receive secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between the user equipment 168 and at least one source secondary node 170 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and a source secondary node 170;

[0310] Determine a plurality of proposed target primary cells in a secondary cell group 174 to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168;

[0311] Determine the auxiliary information 176 at least in part based on the received secondary radio link failure information 164, wherein the auxiliary information 176 assists the at least one target secondary node 166 in determining at least which one of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0312] Send, directly or indirectly, the information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0313] In an example, the apparatus 130 includes:

[0314] At least one processor 132; and

[0315] At least one memory 134 including computer program code,

[0316] The at least one memory 134 and the computer program code are configured to, together with the at least one processor 132, cause the apparatus 130 to at least perform:

[0317] Receive the information 178 and the auxiliary information 176, where the information 178 indicates a plurality of proposed target primary cells in the secondary cell group 174, the plurality of proposed target primary cells will be prepared by the target secondary node 166 for conditional access by the user equipment 168, and the auxiliary information 176 is configured to assist the target secondary node 166 in determining at least which one of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the auxiliary information 176 is determined at least in part based on the secondary radio link failure 164 information associated with the target secondary node 166;

[0318] Determine at least one target primary cell among the plurality of proposed target primary cells in the secondary cell group 174 at least in part based on the received auxiliary information 176, the at least one target primary cell will be prepared for conditional access by the user equipment 168; and

[0319] Send conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to the master node 172.

[0320] In an example, the apparatus 130 includes:

[0321] At least one processor 132; and

[0322] At least one memory 134 including computer program code,

[0323] The at least one memory stores instructions that, when executed by the at least one processor 132, cause the device to at least:

[0324] Receive secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between the user equipment 168 and at least one source secondary node 170 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and the source secondary node 170;

[0325] Determine a plurality of proposed target primary cells in a secondary cell group 174 that are to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168;

[0326] Determine auxiliary information 176 at least in part based on the received secondary radio link failure information 164, where the auxiliary information 176 assists the at least one target secondary node 166 in determining which at least one of the plurality of proposed target primary cells in the secondary cell group 174 is to be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0327] Send, directly or indirectly, information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0328] In an example, the device 130 includes:

[0329] At least one processor 132; and

[0330] At least one memory 134 including computer program code,

[0331] The at least one memory stores instructions that, when executed by the at least one processor 132, cause the device to at least:

[0332] Receive information 178 and assistance information 176, where information 178 indicates multiple proposed target primary cells in secondary cell group 174, and the multiple proposed target primary cells will be prepared by target secondary node 166 for conditional access by user equipment 168. Assistance information 176 is configured to assist target secondary node 166 in determining at least which one of the multiple proposed target primary cells in secondary cell group 174 will be prepared by at least one target secondary node 166 for conditional access by user equipment 168, where the assistance information 176 is determined at least in part based on secondary radio link failure 164 information associated with target secondary node 166;

[0333] Determine at least one target primary cell among the multiple proposed target primary cells in secondary cell group 174, at least in part based on the received assistance information 176, and the at least one target primary cell will be prepared for conditional access by user equipment 168; and

[0334] Send conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to primary node 172.

[0335] As Figure 7A shown, computer program 136 can reach device 130 via any suitable delivery mechanism 162. The delivery mechanism 162 can 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, an article of manufacture including or tangibly embodying computer program 136. The delivery mechanism can be a signal configured to reliably transmit computer program 136. Device 130 can propagate or transmit computer program 136 as a computer data signal.

[0336] Computer program instructions for causing a device to at least perform the following operations or for at least performing the following operations:

[0337] Receive secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in the secondary radio link between user equipment 168 and at least one source secondary node 170 when user equipment 168 is configured to conditionally access at least one target secondary node 166, and user equipment 168 is having dual connectivity with source primary node 172 and source secondary node 170;

[0338] Determine multiple proposed target primary cells in secondary cell group 174 that will be prepared by the at least one target secondary node 166 for conditional access by user equipment 168;

[0339] Determine the auxiliary information 176 at least in part based on the received secondary radio link failure information 164, wherein the auxiliary information 176 assists the at least one target secondary node 166 in determining at least which one of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0340] Send, directly or indirectly, the information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0341] Computer program instructions for causing a device to at least perform the following operations or for at least performing the following operations:

[0342] Receive the information 178 and the auxiliary information 176, the information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174, the plurality of proposed target primary cells being the information 178 to be prepared by the target secondary node 166 for conditional access by the user equipment 168, the auxiliary information 176 being configured to assist the target secondary node 166 in determining at least which one of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168, wherein the auxiliary information 176 is determined at least in part based on the secondary radio link failure 164 information associated with the target secondary node 166;

[0343] Determine at least one target primary cell among the plurality of proposed target primary cells in the secondary cell group 174 at least in part based on the received auxiliary information 176, the at least one target primary cell being prepared for conditional access by the user equipment 168; and

[0344] Send conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to the primary node 172.

[0345] 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. In some but not necessarily all examples, the computer program instructions may be distributed over more than one computer program.

[0346] Although the memory 134 is illustrated as a single component / circuit, it may be implemented as one or more separate components / circuits, some or all of which may be integrated / removable and / or may provide permanent / semi-permanent / dynamic / buffered storage.

[0347] In an example, the memory 134 includes 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. For example, see FIG. 8B.

[0348] Although the processor 132 is illustrated as a single component / circuit, it may be implemented as one or more separate components / circuits, some or all of which may be integrated / removable. The processor 132 may be a single-core or multi-core processor.

[0349] References to "computer-readable storage media", "computer program products", "tangibly implemented computer programs", etc. or "controllers", "computers", "processors", etc. should be understood to cover not only computers with different architectures (such as single / multi-processor architectures and sequential (von Neumann) / parallel architectures), but also dedicated circuits (such as field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), signal processing devices, and other processing circuits). References to computer programs, instructions, code, etc. should be understood to cover software or firmware for programmable processors, such as the programmable content of a hardware device, whether instructions for a processor or configuration settings for a fixed function device, gate array, or programmable logic device, etc.

[0350] As used in this application, the term "circuit" may refer to one or more or all of the following:

[0351] (a) Implementations with only hardware circuits (e.g., implementations using only analog and / or digital circuits for transmission) and

[0352] (b) Combinations of hardware circuits and software, such as (where applicable):

[0353] (i) Combinations of analog and / or digital hardware circuits with software / firmware, and

[0354] (ii) Any part of a hardware processor, software, and memory with software (including a digital signal processor) that work together to cause a device such as a mobile phone or server to perform various functions, and

[0355] (c) Hardware circuits and / or processors (such as a microprocessor or part of a microprocessor) that require software (such as firmware) for operation, but the software may be absent when not required for operation.

[0356] This definition of circuitry applies to all uses of the term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers implementations that are only hardware circuitry or a processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example (and if applicable to a particular claim element), a baseband integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.

[0357] The blocks shown in the drawings may represent steps in a method and / or segments of code in a computer program 136. The illustration of a particular order of the blocks does not necessarily imply the existence of a required or preferred order of the blocks, and the order and arrangement of the blocks may vary. Additionally, some blocks may be omitted.

[0358] Where structural features have been described, whether the function or functions are explicitly described or implicitly described, the structural features may be replaced by a component or components for performing one or more of the functions of the structural features.

[0359] Thus, in an example, apparatus 130 may include components for:

[0360] Receiving secondary radio link failure information 164, where the secondary radio link failure information 164 indicates a situation of a failure in a secondary radio link between a user equipment 168 and at least one source secondary node 170 when the user equipment 168 is configured to conditionally access at least one target secondary node 166, and the user equipment 168 is having dual connectivity with a source master node 172 and the source secondary node 170;

[0361] Determining a plurality of proposed target primary cells in a secondary cell group 174 that will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168;

[0362] Determining auxiliary information 176 at least in part based on the received secondary radio link failure information 164, where the auxiliary information 176 assists the at least one target secondary node 166 in determining which of the plurality of proposed target primary cells in the secondary cell group 174 will be prepared by the at least one target secondary node 166 for conditional access by the user equipment 168; and

[0363] Sending, directly or indirectly, information 178 indicating the plurality of proposed target primary cells in the secondary cell group 174 and the determined auxiliary information 176 to the at least one target secondary node 166.

[0364] Thus, in an example, apparatus 130 may include components for:

[0365] Receive information 178 and auxiliary information 176, where information 178 indicates multiple proposed target primary cells in secondary cell group 174, and the multiple proposed target primary cells will be used by target secondary node 166 to prepare information 178 for conditional access by user equipment 168. Auxiliary information 176 is configured to assist target secondary node 166 in determining which at least one of the multiple proposed target primary cells in secondary cell group 174 will be prepared by at least one target secondary node 166 for conditional access by user equipment 168. Wherein, auxiliary information 176 is determined at least partially based on secondary radio link failure 164 information associated with target secondary node 166;

[0366] Determine at least one target primary cell among the multiple proposed target primary cells in secondary cell group 174, at least partially based on the received auxiliary information 176, and the at least one target primary cell will be prepared for conditional access by user equipment 168; and

[0367] Send conditional access configuration information 186 indicating the determined at least one target primary cell in the secondary cell group to primary node 172.

[0368] In an example, device 130 may include components for performing one or more methods or at least a part of one or more methods disclosed herein.

[0369] In an example, device 130 may be configured to perform one or more methods or at least a part of one or more methods disclosed herein.

[0370] These systems, devices, methods, and computer programs may use machine learning, including statistical learning. Machine learning is a field of computer science that gives computers the ability to learn without being explicitly programmed. A computer can learn from experience E with respect to a type of task T and a performance measure P if its performance (measured by P) on task T improves with experience E. A computer typically learns from previous training data to make predictions about future data. Machine learning includes fully or partially supervised learning and fully or partially unsupervised learning. It can achieve discrete outputs (e.g., classification, clustering) and continuous outputs (e.g., regression). For example, machine learning can be implemented using different methods such as cost function minimization, artificial neural networks, support vector machines, and Bayesian networks, etc. For example, cost function minimization can be used in linear and polynomial regression as well as K-means clustering. Artificial neural networks, such as those with one or more hidden layers, model complex relationships between input vectors and output vectors. Support vector machines can be used for supervised learning. Bayesian networks are directed acyclic graphs that represent the conditional independence of several random variables.

[0371] The above examples can be applied to enable the following components:

[0372] Automotive systems; telecommunications systems; electronic systems including consumer electronics; distributed computing systems; media systems for generating or presenting media content including audio, visual, and audio-visual content as well as mixed, mediated, virtual, and / or augmented reality; personal systems, including personal health systems or personal fitness systems; navigation systems; user interfaces, also known as human-machine interfaces; networks, including cellular, non-cellular, and optical networks; ad-hoc networks; the Internet; the Internet of Things; virtualized networks; and related software and services.

[0373] According to an example of the present disclosure, the apparatus may be provided in an electronic device, such as a mobile terminal. However, it should be understood that the mobile terminal is only an example of an electronic device that can benefit from an implementation of the present disclosure, and thus the scope of the present disclosure should not be considered limited thereto. In some implementation examples, the apparatus may be provided in a mobile terminal, other types of electronic devices, such as but not limited to: mobile communication devices, handheld 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 easily adopt the examples of the present disclosure. In addition, regardless of the purpose of the device to provide mobility, they can adopt the examples of the present disclosure at any time.

[0374] As used in this document, the term "comprising" has an inclusive rather than exclusive meaning. That is, whenever it is stated that X comprises Y, it means that X may contain only one Y or may contain more than one Y. If the term "comprising" with an exclusive meaning is to be used, it should be explicitly stated in the context as "comprising only one..." or "consisting of...".

[0375] In this specification, the terms "connected", "coupled", and "communicating" and their derivatives refer to an operational connection / coupling / communication. It should be understood that any number or combination of intermediate components (including no intermediate components) may exist, i.e., providing a direct or indirect connection / coupling / communication. Any such intermediate components may include hardware and / or software components.

[0376] As used herein, the term "determine" (and its grammatical variants) may include, but is not limited to: calculating, computing, processing, deriving, measuring, investigating, identifying, looking up (e.g., looking up in a table, database, or another data structure), ascertaining, etc. Moreover, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), obtaining, etc. Moreover, "determine" may include parsing, selecting, picking, establishing, etc.

[0377] In this specification, various examples have been referred to. The description of a feature or function related to an example indicates that those features or functions exist in that example. The use of the terms "example" or "for example" or "may" or "can" in the text indicates that, whether explicitly stated or not, such features or functions exist in at least the described example, whether described as an example or not, and they may but do not necessarily exist in some or all other examples. Thus, "example", "for example", "may" or "can" refer to a particular instance in a class of examples. The attributes of an instance may be the attributes of only that instance or the attributes of the class or the attributes of a subclass of the class that includes some, but not all, instances of the class. Thus, features implicitly disclosed by referring to one example rather than another example can, where possible, be used as part of a working combination in that other example, but do not necessarily have to be used in that other example.

[0378] Although examples have been described in the foregoing paragraphs with reference to various examples, it should be understood that the given examples can be modified without departing from the scope of the claims.

[0379] In addition to the combinations explicitly described above, the features described previously can also be used in other combinations.

[0380] Although functions have been described with reference to certain features, these functions can be performed by other features (whether or not they have been described).

[0381] Although features have been described with reference to certain examples, those features may also be present in other examples whether or not they are described.

[0382] The terms "a", "an", or "the" as used in this document have an inclusive rather than an exclusive meaning. That is, whenever X is referred to as including a / an / the Y, it means that X may contain only one Y or may contain more than one Y, unless the context clearly indicates the contrary. If "a", "an", or "the" is intended to have an exclusive meaning, it should be clearly stated in the context. In some cases, the use of "at least one" or "one or more" may be for emphasis of the inclusive meaning, but the absence of these terms should not be taken as inferring any exclusive meaning.

[0383] The presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself and also to features (equivalent features) that achieve substantially the same technical effect. For example, equivalent features include variant features that achieve substantially the same result in substantially the same way. For example, equivalent features include features that perform substantially the same function and achieve substantially the same result in substantially the same way.

[0384] In this specification, adjectives or adjective phrases are used to describe the features of various examples. Such feature descriptions related to examples indicate that the characteristic is present in some examples that are exactly the same as those described and in other examples that are substantially the same as those described.

[0385] Some examples of the present disclosure have been described above. However, those of ordinary skill in the art will recognize possible alternative structural and method features that provide functionality equivalent to the specific examples of such structures and features described above, and for the sake of brevity and clarity, have been omitted from the above description. Nevertheless, the above description should be understood to implicitly include a reference to such alternative structural and method features that provide equivalent functionality, unless such alternative structural or method features are explicitly excluded in the above description of the examples of the present disclosure.

[0386] Although in the foregoing specification the applicant has endeavored to draw attention to those features that are considered important, it should be understood that the applicant may seek protection by means of claims for any patentable feature or combination of features mentioned above and / or shown in the drawings, whether or not they have been emphasized.

Claims

1. A device, comprising components for the following operations: Receiving secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, and the user equipment is having dual connectivity with a source master node and a source secondary node; Determining a plurality of proposed target primary cells in a secondary cell group that will be prepared by the at least one target secondary node for conditional access by the user equipment; Determining auxiliary information at least in part based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining at least which one of the plurality of proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment; and Sending, directly or indirectly, information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information to the at least one target secondary node.

2. The device according to claim 1, wherein The auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by the user equipment.

3. The device according to claim 1 or 2, wherein The auxiliary information includes information indicating the number of times the proposed target primary cell in the secondary cell group is the correct selection for conditional access by the user equipment.

4. The device according to any one of the preceding claims, wherein, Sending information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information includes: sending at least one SgNB change required message and / or at least one SgNB addition request message.

5. The device according to any one of claims 1 to 4, wherein The information indicating the plurality of proposed target primary cells in the secondary cell group includes at least one cell identifier.

6. The device according to any one of the preceding claims, wherein the components include: At least one processor; And At least one memory storing instructions that, when executed by the at least one processor, cause the operation of the device.

7. A method, comprising: Receiving secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access at least one target secondary node, and the user equipment is having dual connectivity with a source master node and a source secondary node; Determining a plurality of proposed target primary cells in a secondary cell group that will be prepared by the at least one target secondary node for conditional access by the user equipment; Determining auxiliary information at least in part based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining at least which one of the plurality of proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment; and Directly or indirectly send information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information to the at least one target secondary node.

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

9. The method according to claim 7 or 8, wherein The auxiliary information includes information indicating the number of times that the proposed target primary cell in the secondary cell group is the correct choice for conditional access by a user equipment.

10. The method according to any one of claims 7 to 9, wherein, Sending information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information includes: sending 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 in the secondary cell group includes at least one cell identifier.

12. A computer program, comprising instructions for causing a device to at least perform the following operations: Receive secondary radio link failure information, where the secondary radio link failure information indicates a situation of a failure in a secondary radio link between the user equipment and at least one source secondary node when the user equipment is configured to conditionally access the at least one target secondary node, and the user equipment is having dual connectivity with a source primary node and a source secondary node; Determine a plurality of proposed target primary cells in the secondary cell group that will be prepared by the at least one target secondary node for conditional access by a user equipment; Determine auxiliary information at least partially based on the received secondary radio link failure information, where the auxiliary information assists the at least one target secondary node in determining at least which one of the plurality of proposed target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by a user equipment; and Directly or indirectly send information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information to the at least one target secondary node.

13. The computer program according to claim 12, wherein, The auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for being prepared by the at least one target secondary node for conditional access by a user equipment.

14. The computer program according to claim 12 or 13, wherein, The auxiliary information includes information indicating the number of times that the proposed target primary cell in the secondary cell group is the correct choice for conditional access by a user equipment.

15. The computer program according to any one of claims 12 to 14, wherein, Sending information indicating the plurality of proposed target primary cells in the secondary cell group and the determined auxiliary information includes: sending at least one SgNB change required message and / or at least one SgNB addition request message.

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

17. A device, comprising components for the following operations: Receive information of a target primary cell that receives a plurality of suggestions in an indicator secondary cell group to be prepared by a target secondary node for conditional access by a user equipment, and auxiliary information configured to assist the target secondary node in determining at least which one of the plurality of suggested target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment, wherein the auxiliary information is determined at least in part based on secondary radio link failure information associated with the target secondary node; And Determine at least one target primary cell among the plurality of proposed target primary cells in the secondary cell group at least partially based on the received auxiliary information, where the at least one target primary cell will be prepared for conditional access by a user equipment; And Send conditional access configuration information indicating at least one determined target primary cell in a secondary cell group to a master node.

18. The apparatus according to claim 17, wherein The auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for conditional access to be prepared by the at least one target secondary node for use by a user equipment.

19. The apparatus according to claim 17 or 18, wherein The auxiliary information includes information indicating the number of times that a proposed target primary cell in the secondary cell group is the correct choice for conditional access by the user equipment.

20. The device according to any one of claims 17 to 19, wherein, Receiving the information indicating the plurality of proposed target primary cells in the secondary cell group and the auxiliary information includes: receiving at least one SgNB addition request message.

21. The device according to any one of claims 17 to 20, wherein The auxiliary information is derived from a source master node or a source secondary node.

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

23. The method according to claim 22, wherein, The auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for conditional access to be prepared by the at least one target secondary node for use by a user equipment.

24. The method according to claim 22 or 23, wherein, The auxiliary information includes information indicating the number of times that a proposed target primary cell in the secondary cell group is the correct choice for conditional access by the user equipment.

25. The method according to any one of claims 22 to 24, wherein Receiving the information indicating the plurality of proposed target primary cells in the secondary cell group and the auxiliary information includes: receiving at least one SgNB addition request message.

26. The method according to any one of claims 22 to 25, wherein, The auxiliary information is initiated from a source master node or a source secondary node.

27. A computer program, comprising instructions for causing a device to at least perform the following operations: Receive information of a target primary cell that receives a plurality of suggestions in an indicator secondary cell group to be prepared by a target secondary node for conditional access by a user equipment, and assistance information configured to assist the target secondary node in determining at least which one of the plurality of suggested target primary cells in the secondary cell group will be prepared by the at least one target secondary node for conditional access by the user equipment, wherein the assistance information is determined at least partially based on secondary radio link failure information associated with the target secondary node; And Determining at least one target primary cell from the plurality of proposed target primary cells in the secondary cell group, the at least one target primary cell to be prepared for conditional access by the user equipment, at least in part based on the received auxiliary information; And Sending conditional access configuration information indicating the at least one determined target primary cell in the secondary cell group to a master node.

28. The computer program according to claim 27, wherein, The auxiliary information includes priority information of the plurality of proposed target primary cells in the secondary cell group for conditional access to be prepared by the at least one target secondary node for use by a user equipment.

29. The computer program according to claim 27 or 28, wherein The auxiliary information includes information indicating the number of times that the proposed target primary cell in the secondary cell group is the correct selection for conditional access of the user equipment.

30. The computer program according to any one of claims 27 to 29, wherein Receiving the information on the multiple proposed target primary cells in the secondary cell group and the auxiliary information includes: receiving at least one SgNB addition request message.

31. The computer program according to any one of claims 27 to 30, wherein, The auxiliary information is derived from a source master node or a source secondary node.

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