SAPC release and maintenance of the configuration being executed

Abstract

Methods, apparatus, and computer program products are provided. In the context of the method, the method receives a reconfiguration message from a master node via user equipment, which includes a set of change configurations for the primary cells of a conditional secondary cell group, and the set of change configurations for the primary cells of a conditional secondary cell group includes a set of execution conditions. The method evaluates the set of execution conditions. Based on the evaluation of the set of execution conditions, the method executes one of the set of change configurations for the primary cells of the conditional secondary cell group. The method receives an indication from the master node that the executed change configuration for the primary cells of the conditional secondary cell group is retained. The method retains the executed change configuration for the primary cells of the conditional secondary cell group.

Description

[Technical Field]

[0001] Exemplary embodiments generally relate to techniques for the selective activation of primary cells in a secondary cell group, and more specifically, to techniques for maintaining a conditional change configuration of primary cells in a secondary cell group. [Background technology]

[0002] User equipment often moves across a wide geographical area. When user equipment moves, this can result in connections to various primary cells in a secondary cell group that provides coverage. When user equipment switches primary cells in a secondary cell group, it receives various configurations associated with the primary cell in the secondary cell group. When one of these configurations is performed, user equipment often retains the configuration of a nearby primary cell (PSCell) in preparation for future changes to the primary cell in the secondary cell group. However, user equipment does not always retain the performed configuration. This can result in delays if user equipment moves away from a primary cell in a secondary cell group and later returns to re-receive the configuration.

[0003] In a new radio dual connectivity deployment scenario using a secondary cell group with a frequency range 2-based primary cell, it is assumed that user equipment will have frequent movement across the primary cell of the secondary cell group. Similarly, for a new radio dual connectivity deployment using a secondary cell layer acting as a capacity booster with densely deployed secondary cells, it is assumed that user equipment will also have frequent movement across the primary cell of the secondary cell group. Failure to maintain the configuration increases the PSCell change delay. RAN4 defines the PSCell change delay as follows: User equipment, slot n+T config_PSCell_ConditionalPreviously, it would be possible to transmit a physical random access channel preamble towards the new target PSCell. Slot n is the last slot overlapping with the physical downlink shared channel including the conditional PSCell change. T config_PSCell_Conditional is given by the formula T config_PSCell_Conditional =T RRC_delay +T Event_DU +T measure +T UE_preparation +T processing +T Δ +T PSCell_DU +2 ms. T RRC_delay is the radio resource control processing delay, which is the corresponding radio resource control message embedded in the evolved universal terrestrial radio access radio resource control message. Otherwise, it is the radio resource control delay for processing the conditional PSCell addition command. This value starts counting from the time when the master node sends a conditional (re)configuration including the CPC configuration of the candidate target PSCell to the user equipment. T Event_DU is the delay uncertainty, or the time from when the user equipment successfully decodes the conditional PSCell addition command until there are conditions that will trigger the conditional PSCell addition at the measurement reference point. T measure is determined as the defined measurement time delay from the end of T Event_DU until the user equipment performs the PSCell change to the target cell and the interruption time starts. T UE_preparation is defined as the user equipment preparation time for the conditional PSCell addition and starts after the user equipment recognizes that the conditions for the PSCell addition are met and the identity of the PSCell is determined. This time is at most 10 milliseconds. T processing is defined as the SW processing time required by the user equipment, including the radio frequency warm-up period. This time period is 20 milliseconds when the PSCell is in frequency range 1 and 40 milliseconds when the PSCell is in frequency range 2. T ΔThis is defined as the time for precise time tracking of the target cell and obtaining complete timing information. This is equal to l*Trs ms. PSCell_DU `Trs` is defined as the uncertainty of the delay when acquiring the first available physical random access channel occasion in PSCell. This time is, at most, the sum of the association period of the synchronization signal block to the physical random access channel occasion and 10 ms. `Trs` is defined as the SMTC period of the target cell if an SMTC configuration for the target cell is provided to the user equipment in the PSCell addendum message. Otherwise, `Trs` is the SMTC configured with a measObjectNR having the same SSB frequency and subcarrier spacing. If no SMTC configuration or measurement object for this frequency is provided to the user equipment, the requirements of this section apply with `Trs` equal to 5 ms, assuming the transmission period of the synchronization signal block is 5 ms. If the transmission period of the synchronization signal block is not 5 ms, there are no requirements.

[0004] To support subsequent secondary cell group changes, the following procedure is used: When the execution conditions for a candidate PSCell for a conditional PSCell change are met, the user device makes a conditional PSCell change toward the candidate PSCell. After completing the addition or modification of the PSCell, the user device retains the conditional configuration of other candidate PSCells for subsequent conditional PSCell changes. The user device continues to evaluate the execution conditions of other candidate PSCells. When the execution conditions for another candidate PSCell are met, the user device makes a conditional PSCell change toward that candidate PSCell. Currently, if the user device needs to be able to return to the current secondary cell group by a conditional procedure, it is assumed that the network can explicitly configure the candidate configuration for that cell. In selective activation of a secondary cell, an explicit indication from the network releases the conditional PSCell change or conditional PSCell addition configuration for the user device after a PSCell change for a master node change. R2 assumes that the conditional PSCell addition configuration may be used for conditional PSCell changes with different trigger conditions. It is not clear that the conditional PSCell change configuration is retained by the user device after the user device has performed the configuration. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Methods, apparatus, and computer program products for maintaining a modified configuration of a primary cell in a conditionally executed secondary cell group are disclosed. Embodiments described herein enable user equipment and networks to maintain a configuration corresponding to the conditions being performed. [Means for solving the problem]

[0006] In an exemplary embodiment, a method is provided which includes receiving a reconfiguration message from a master node via a user device, the set of primary cell change configurations for a conditional secondary cell group including a set of execution conditions. The method further includes evaluating the set of execution conditions. The method further includes executing one of the set of primary cell change configurations for the conditional secondary cell group based on the evaluation of the set of execution conditions. The method includes receiving an indication of the primary cell change configuration for the conditional secondary cell group that is to be executed. The method further includes retaining the primary cell change configuration for the conditional secondary cell group that is to be executed.

[0007] In an exemplary embodiment, the reconfiguration message includes an indication that the change configuration of the primary cell of a conditional secondary cell group being performed is preserved.

[0008] In an exemplary embodiment, an indication that the modified configuration of the primary cell of the conditionally executed secondary cell group is preserved is received from the target secondary node in a second reconfiguration message after execution.

[0009] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0010] In an exemplary embodiment, the indication includes a wireless resource control message.

[0011] In an exemplary embodiment, the indication includes a MAC control element message.

[0012] In an exemplary embodiment, the indication includes a downlink control information message.

[0013] The method of an exemplary embodiment further includes completing a random access procedure associated with the modification configuration of the primary cell of a conditional secondary cell that is being performed.

[0014] In an exemplary embodiment, an indication that the primary cell modification configurations of a conditional secondary cell group are retained includes an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained, and a set of primary cell modification configurations of the conditional secondary cell group are retained, excluding one or more sets of primary cell modification configurations of the conditional secondary cell group.

[0015] In an exemplary embodiment, the reconfiguration message includes an indication that one or more of the set of change configurations for the primary cell of a conditional secondary cell group are not retained.

[0016] In an exemplary embodiment, an indication that one or more sets of primary cell modification configurations for a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

[0017] In an exemplary embodiment, a method is provided which includes receiving a secondary node addition request from a source master node by a target secondary node. The method further includes determining a set of primary cells in a secondary cell group associated with a set of primary cell change configurations for a conditional secondary cell group. The method further includes sending an indication that the set of primary cell change configurations for the conditional secondary cell group will be retained. The method further includes sending the set of primary cell conditional changes for the secondary cell group to the source master node.

[0018] In an exemplary embodiment, an indication that a modified configuration of a primary cell of a conditional secondary cell group to be executed is retained is sent to a source master node before the execution of the modified configuration of the primary cell of the conditional secondary cell group to be executed.

[0019] In an exemplary embodiment, the indication is sent by the source master node to a user equipment.

[0020] In an exemplary embodiment, an indication that a modified configuration of a primary cell of a conditional secondary cell group to be executed is retained is sent to a user equipment during a connection period after the execution of the modified configuration of the primary cell of the conditional secondary cell group to be executed.

[0021] In an exemplary embodiment, a set of modified configurations of primary cells of conditional secondary cell groups includes modified configurations of primary cells of a plurality of conditional secondary cell groups.

[0022] In an exemplary embodiment, the indication includes a radio resource control message.

[0023] In an exemplary embodiment, the indication includes a MAC control element message.

[0024] In an exemplary embodiment, the indication includes a downlink control information message.

[0025] In an exemplary embodiment, a method is provided which includes receiving a reconfiguration message from a master node via a user device, the set of primary cell change configurations for a conditional secondary cell group including a set of execution conditions. The method further includes evaluating the set of execution conditions. Based on the evaluation of the set of execution conditions, the method further includes executing one of the set of primary cell change configurations for the conditional secondary cell group. The method further includes sending an indication to another target secondary node that the executed primary cell change configuration for the conditional secondary cell group is retained. The method further includes retaining the executed primary cell change configuration for the conditional secondary cell group.

[0026] In an exemplary embodiment, an indication that the primary cell change configuration of a conditional secondary cell group being executed is preserved is sent after execution during the connection period.

[0027] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0028] In an exemplary embodiment, the indication includes a wireless resource control message.

[0029] In an exemplary embodiment, the indication includes a MAC control element message.

[0030] In an exemplary embodiment, the indication includes an uplink control information message.

[0031] The method of an exemplary embodiment further includes completing a random access procedure associated with the modification configuration of the primary cell of a conditional secondary cell group being performed.

[0032] In an exemplary embodiment, the device is provided with a non-temporary computer-readable storage medium that, when executed by the device, causes the device to receive a reconfiguration message from a master node via a user device, the set of primary cell modification configurations for a conditional secondary cell group, the set of primary cell modification configurations for a conditional secondary cell group, the set of execution conditions. The non-temporary computer-readable storage medium further includes a computer instruction configured to evaluate the set of execution conditions at runtime. The non-temporary computer-readable storage medium further includes a computer instruction configured to execute one of the set of primary cell modification configurations for a conditional secondary cell group at runtime, based on the evaluation of the set of execution conditions. The non-temporary computer-readable storage medium further includes a computer instruction configured to receive an indication of the primary cell modification configuration for a conditional secondary cell group that is to be executed. The non-temporary computer-readable storage medium further includes a computer instruction configured to hold the primary cell modification configuration for a conditional secondary cell group that is to be executed at runtime.

[0033] In an exemplary embodiment, the reconfiguration message includes an indication that the change configuration of the primary cell of a conditional secondary cell group being performed is preserved.

[0034] In an exemplary embodiment, an indication that the modified configuration of the primary cell of the conditionally executed secondary cell group is preserved is received from the target secondary node in a second reconfiguration message after execution.

[0035] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0036] In an exemplary embodiment, the indication includes a wireless resource control message.

[0037] In an exemplary embodiment, the indication includes a MAC control element message.

[0038] In an exemplary embodiment, the indication includes a downlink control information message.

[0039] In an exemplary embodiment, the non-temporary computer-readable storage medium further includes computer instructions configured to complete, at runtime, random access procedures associated with modifying the primary cell of a conditional secondary cell that is being executed.

[0040] In an exemplary embodiment, an indication that the primary cell modification configurations of a conditional secondary cell group are retained includes an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained, and a set of primary cell modification configurations of the conditional secondary cell group are retained, excluding one or more sets of primary cell modification configurations of the conditional secondary cell group.

[0041] In an exemplary embodiment, the reconfiguration message includes an indication that one or more of the set of change configurations for the primary cell of a conditional secondary cell group are not retained.

[0042] In an exemplary embodiment, an indication that one or more configuration changes of the primary cell of a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

[0043] In an exemplary embodiment, the device is provided with a non-temporary computer-readable storage medium that, when executed by the device, causes the device to receive a secondary node addition request from a source master node by a target secondary node. The non-temporary computer-readable storage medium further includes a computer instruction configured to determine, at runtime, a set of primary cells of secondary cells associated with a set of primary cell modification configurations of a conditional secondary cell group. The non-temporary computer-readable storage medium further includes a computer instruction configured to transmit, at runtime, an indication that the set of primary cell modification configurations of the conditional secondary cell group is being preserved. The non-temporary computer-readable storage medium further includes a computer instruction configured to transmit, at runtime, a set of conditional modification configurations of the primary cells of the secondary cell group to the source master node.

[0044] In an exemplary embodiment, an indication that the primary cell change configuration of the conditional secondary cell group to be performed is preserved is sent to the source master node before the execution of the primary cell change configuration of the conditional secondary cell group to be performed.

[0045] In an exemplary embodiment, the indication is transmitted to the user device by the source master node.

[0046] In an exemplary embodiment, an indication that the primary cell change configuration of the conditional secondary cell group being performed is retained is sent to the user device during the connection period after the conditional secondary cell group's primary cell change configuration has been performed.

[0047] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0048] In an exemplary embodiment, the indication includes a wireless resource control message.

[0049] In an exemplary embodiment, the indication includes a MAC control element message.

[0050] In an exemplary embodiment, the indication includes a downlink control information message.

[0051] In an exemplary embodiment, the device is provided with a non-temporary computer-readable storage medium that, when executed by the device, causes the device to receive a reconfiguration message from a master node via a user device, the set of primary cell modification configurations for a conditional secondary cell group, the set of primary cell modification configurations for a conditional secondary cell group, the set of execution conditions. The non-temporary computer-readable storage medium further includes a computer instruction configured to evaluate the set of execution conditions at runtime. The non-temporary computer-readable storage medium further includes a computer instruction configured to execute one of the set of primary cell modification configurations for a conditional secondary cell group at runtime, based on the evaluation of the set of execution conditions. The non-temporary computer-readable storage medium further includes a computer instruction configured to send an indication to another target secondary node that the primary cell modification configuration for a conditional secondary cell group that is being executed is being held. The non-temporary computer-readable storage medium further includes a computer instruction configured to hold the primary cell modification configuration for a conditional secondary cell group that is being executed at runtime.

[0052] In an exemplary embodiment, an indication that the primary cell change configuration of a conditional secondary cell group being executed is preserved is sent after execution during the connection period.

[0053] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0054] In an exemplary embodiment, the indication includes a wireless resource control message.

[0055] In an exemplary embodiment, the indication includes a MAC control element message.

[0056] In an exemplary embodiment, the indication includes an uplink control information message.

[0057] In an exemplary embodiment, the non-temporary computer-readable storage medium further includes computer instructions configured to complete, at runtime, random access procedures associated with modifying the primary cell of a conditional secondary cell group being executed.

[0058] In an exemplary embodiment, a user device is provided, comprising at least one processor and at least one memory containing computer program code, wherein the at least one memory and computer program code are configured with at least one processor to cause the user device to receive a reconfiguration message from a master node containing a set of change configurations for the primary cells of a conditional secondary cell group, the set of change configurations for the primary cells of a conditional secondary cell group containing a set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to evaluate the set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to execute one of the sets of change configurations for the primary cells of a conditional secondary cell group based on the evaluation of the set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to receive an indication of the change configuration for the primary cells of a conditional secondary cell group that is to be executed. The at least one memory and computer program code are further configured with at least one processor to cause the user device to hold the change configuration for the primary cells of a conditional secondary cell group that is to be executed.

[0059] In an exemplary embodiment, the reconfiguration message includes an indication that the change configuration of the primary cell of a conditional secondary cell group being performed is preserved.

[0060] In an exemplary embodiment, an indication that the modified configuration of the primary cell of the conditionally executed secondary cell group is preserved is received from the target secondary node in a second reconfiguration message after execution.

[0061] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0062] In an exemplary embodiment, the indication includes a wireless resource control message.

[0063] In an exemplary embodiment, the indication includes a MAC control element message.

[0064] In an exemplary embodiment, the indication includes a downlink control information message.

[0065] In an exemplary embodiment, at least one memory and computer program code are further configured with at least one processor to cause the user device to complete a random access procedure associated with the modification configuration of the primary cell of a conditional secondary cell that is being executed.

[0066] In an exemplary embodiment, an indication that the primary cell modification configurations of a conditional secondary cell group are retained includes an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained, and a set of primary cell modification configurations of the conditional secondary cell group are retained, excluding one or more sets of primary cell modification configurations of the conditional secondary cell group.

[0067] In an exemplary embodiment, the reconfiguration message includes an indication that one or more of the set of change configurations for the primary cell of a conditional secondary cell group are not retained.

[0068] In an exemplary embodiment, an indication that one or more sets of primary cell modification configurations for a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

[0069] In an exemplary embodiment, a target secondary node is provided, comprising at least one processor and at least one memory containing computer program code, wherein the at least one memory and computer program code are configured with at least one processor to cause the target secondary node to receive secondary node addition requests from a source master node. The at least one memory and computer program code are further configured with at least one processor to cause the secondary node to determine a set of primary cells in a secondary cell group associated with a set of change configurations for the primary cells of a conditional secondary cell group. The at least one memory and computer program code are further configured with at least one processor to cause the secondary node to send an indication that the change configuration for the primary cells of a conditional secondary cell group is being held for the set of change configurations for the primary cells of the conditional secondary cell group. The at least one memory and computer program code are further configured with at least one processor to cause the secondary node to send the set of change configurations for the primary cells of a conditional secondary cell group to the source master node.

[0070] In an exemplary embodiment, an indication that the primary cell change configuration of the conditional secondary cell group to be performed is preserved is sent to the source master node before the execution of the primary cell change configuration of the conditional secondary cell group to be performed.

[0071] In an exemplary embodiment, the indication is transmitted to the user device by the source master node.

[0072] In an exemplary embodiment, an indication that the change configuration of the primary cell of a conditional secondary cell group being performed is retained is sent to the user device during the connection period after the change configuration of the primary cell of the conditional secondary cell group being performed is executed.

[0073] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0074] In an exemplary embodiment, the indication includes a wireless resource control message.

[0075] In an exemplary embodiment, the indication includes a MAC control element message.

[0076] In an exemplary embodiment, the indication includes a downlink control information message.

[0077] In an exemplary embodiment, a user device is provided, comprising at least one processor and at least one memory containing computer program code, wherein the at least one memory and computer program code are configured with at least one processor to cause the user device to receive a reconfiguration message from a master node containing at least a set of change configurations for the primary cells of a conditional secondary cell group, the set of change configurations for the primary cells of a conditional secondary cell group containing a set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to evaluate the set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to execute one of the sets of change configurations for the primary cells of a conditional secondary cell group based on the evaluation of the set of execution conditions. The at least one memory and computer program code are further configured with at least one processor to cause the user device to send an indication to another target secondary node that the change configuration for the primary cells of a conditional secondary cell group that is to be executed is being held. At least one memory and computer program code are further configured with at least one processor to cause the user device to maintain a modified configuration of the primary cell of a conditionally executed secondary cell group.

[0078] In an exemplary embodiment, an indication that the primary cell change configuration of a conditional secondary cell group being executed is preserved is sent after execution during the connection period.

[0079] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0080] In an exemplary embodiment, the indication includes a wireless resource control message.

[0081] In an exemplary embodiment, the indication includes a MAC control element message.

[0082] In an exemplary embodiment, the indication includes an uplink control information message.

[0083] In an exemplary embodiment, at least one memory and computer program code are further configured with at least one processor to cause the user device to complete a random access procedure associated with a modification configuration of the primary cell of a conditional secondary cell group being executed.

[0084] In an exemplary embodiment, a user device is provided which includes means for receiving a reconfiguration message from a master node, which includes a set of change configurations for the primary cell of a conditional secondary cell group, the set of change configurations for the primary cell of a conditional secondary cell group includes a set of execution conditions. The user device further includes means for evaluating the set of execution conditions. The user device further includes means for executing one of the set of change configurations for the primary cell of a conditional secondary cell group based on the evaluation of the set of execution conditions. The user device further includes means for receiving an indication that the executed change configuration for the primary cell of a conditional secondary cell group is retained. The user device further includes means for retaining the executed change configuration for the primary cell of a conditional secondary cell group.

[0085] In an exemplary embodiment, the reconfiguration message includes an indication that the change configuration of the primary cell of a conditional secondary cell group being performed is preserved.

[0086] In an exemplary embodiment, an indication that the modified configuration of the primary cell of the conditionally executed secondary cell group is preserved is received from the target secondary node in a second reconfiguration message after execution.

[0087] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0088] In an exemplary embodiment, the indication includes a wireless resource control message.

[0089] In an exemplary embodiment, the indication includes a MAC control element message.

[0090] In an exemplary embodiment, the indication includes a downlink control information message.

[0091] The user equipment of an exemplary embodiment further includes means for completing random access procedures associated with the modification configuration of the primary cell of a conditional secondary cell being performed.

[0092] In exemplary embodiments, the retention of primary cell modification configurations for a conditional secondary cell group includes an indication that one or more sets of primary cell modification configurations for a conditional secondary cell group are not retained, and that a set of primary cell modification configurations for a conditional secondary cell group is retained, excluding one or more sets of primary cell modification configurations for a conditional secondary cell group.

[0093] In an exemplary embodiment, the reconfiguration message includes an indication that one or more of the set of change configurations for the primary cell of a conditional secondary cell group are not retained.

[0094] In an exemplary embodiment, an indication that one or more sets of primary cell modification configurations for a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

[0095] In an exemplary embodiment, a target secondary node is provided, which includes means for receiving a secondary node addition request from a source master node. The target secondary node further includes means for determining a set of primary cells in a secondary cell group, associated with a set of change configurations for the primary cells of a conditional secondary cell group. The secondary node further includes means for sending an indication that the set of change configurations for the primary cells of the conditional secondary cell group is being performed. The secondary node further includes means for sending the set of change configurations for the primary cells of the conditional secondary cell group to the source master node.

[0096] In an exemplary embodiment, an indication that the primary cell change configuration of the conditional secondary cell group to be performed is preserved is sent to the source master node before the execution of the primary cell change configuration of the conditional secondary cell group to be performed.

[0097] In an exemplary embodiment, the indication is transmitted to the user device by the source master node.

[0098] In an exemplary embodiment, an indication that the primary cell change configuration of the conditional secondary cell group being performed is retained is sent to the user device during the connection period after the conditional secondary cell group's primary cell change configuration has been performed.

[0099] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0100] In an exemplary embodiment, the indication includes a wireless resource control message.

[0101] In an exemplary embodiment, the indication includes a MAC control element message.

[0102] In an exemplary embodiment, the indication includes a downlink control information message.

[0103] In an exemplary embodiment, a user device is provided which includes means for receiving a reconfiguration message from a master node containing a set of change configurations for the primary cell of a conditional secondary cell group, the set of change configurations for the primary cell of a conditional secondary cell group containing a set of execution conditions. The user device further includes means for evaluating the set of execution conditions. The user device further includes means for executing one of the set of change configurations for the primary cell of a conditional secondary cell group based on the evaluation of the set of execution conditions. The user device further includes means for sending an indication to another target secondary node that the change configuration for the primary cell of the conditional secondary cell group that is to be executed is retained. The user device further includes means for retaining the change configuration for the primary cell of the conditional secondary cell group that is to be executed.

[0104] In an exemplary embodiment, an indication that the primary cell change configuration of a conditional secondary cell group being executed is preserved is sent after execution during the connection period.

[0105] In an exemplary embodiment, a set of primary cell modification configurations for a conditional secondary cell group includes multiple primary cell modification configurations for conditional secondary cell groups.

[0106] In an exemplary embodiment, the indication includes a wireless resource control message.

[0107] In an exemplary embodiment, the indication includes a MAC control element message.

[0108] In an exemplary embodiment, the indication includes an uplink control information message.

[0109] The user equipment of an exemplary embodiment further includes means for completing random access procedures associated with the modification configuration of the primary cell of a conditional secondary cell group being performed.

[0110] While certain exemplary embodiments of this disclosure have been described in general terms, references to the accompanying drawings, which are not necessarily drawn to scale, will be made below. [Brief explanation of the drawing]

[0111] [Figure 1] This is a block diagram of a system according to an exemplary embodiment of the present disclosure, including both a base station and user equipment configured to communicate via at least uplink and downlink transmissions. [Figure 2] This is a block diagram of an exemplary communication system in which the system of Figure 1 may be deployed according to exemplary embodiments of the present disclosure. [Figure 3] This flowchart illustrates a conditional modification of a primary cell in a secondary cell group, initiated by a source node and performed inter-source node, according to a previous embodiment. [Figure 4] This is an example diagram illustrating the change of the primary cell in a secondary cell group when user equipment is configured with CPAC selective activation, according to a previous embodiment. [Figure 5]This is an example diagram illustrating the problems associated with conditional modification of the primary cell of a secondary cell group according to a previous embodiment. [Figure 6] This flowchart illustrates an example of an exemplary embodiment of the present disclosure in which a user device receives an indication that it will retain the modified configuration of the primary cell of a conditional secondary cell group before execution. [Figure 7] This flowchart illustrates an example of an exemplary embodiment of the present disclosure in which a user device receives an indication that, after execution, it retains the modified configuration of the primary cell of a conditional secondary cell group that is being executed. [Figure 8] This flowchart illustrates an example of an exemplary embodiment of the present disclosure that, after execution, triggers the transmission of an indication that the user device retains the modified configuration of the primary cell of a conditional secondary cell group. [Figure 9] This flowchart shows the actions taken, such as those performed by the apparatus in Figure 2, to maintain the modified configuration of the primary cell of a conditionally performed secondary cell group, according to exemplary embodiments of the present disclosure. [Figure 10] This flowchart shows the actions taken, such as those performed by the apparatus in Figure 2, to transmit a set of modified configurations for the primary cell of a conditional secondary cell group, according to exemplary embodiments of the present disclosure. [Figure 11] This flowchart shows alternative actions, such as those performed by the apparatus in Figure 2, to maintain the modified configuration of the primary cell of a conditionally performed secondary cell group, according to exemplary embodiments of the present disclosure. [Modes for carrying out the invention]

[0112] Several embodiments of this disclosure are described herein in full with reference to the accompanying drawings, which illustrate some, but not all, embodiments. In fact, various embodiments may be embodied in many different forms and should not be construed as being limited to the embodiments described herein, but rather these embodiments are provided so as to satisfy the appropriate legal requirements of this disclosure. Similar reference numbers refer to similar elements throughout. When used herein, the terms “data,” “content,” “information,” and similar terms may be used interchangeably to refer to data that is transmitted, received, and / or stored by embodiments of this disclosure. Accordingly, the use of any such terms should not be construed as limiting the spirit and scope of embodiments of this disclosure.

[0113] Furthermore, as used herein, the term “circuit” means (a) a hardware-only circuit implementation (e.g., implementations in analog and / or digital circuits); (b) a combination of a circuit and a computer program product including software instructions and / or firmware instructions stored in one or more computer-readable memories that work together to cause the device to perform one or more functions described herein; and (c) a circuit, such as a microprocessor or a part of a microprocessor, that requires software or firmware for operation even if the software or firmware is not physically present. This definition of “circuit” applies to all use of the term herein, including any claim. As a further example, as used herein, the term “circuit” also includes an implementation including one or more processors and / or parts thereof and accompanying software and / or firmware. As another example, as used herein, the term “circuit” also includes, for example, a baseband integrated circuit or application processor integrated circuit for a mobile phone, or a similar integrated circuit in a server, cellular network device, other network device (such as a core network device), field-programmable gate array, and / or other computing device.

[0114] As used herein, the term “computer-readable medium” means non-temporary storage hardware, non-temporary storage devices, or non-temporary computer system memory that may be accessed by a controller, microcontroller, computing system, or module of a computing system to encode computer-executable instructions or software programs on it. A non-temporary “computer-readable medium” may be accessed by a computing system or module of a computing system to retrieve and / or execute computer-executable instructions or software programs encoded on the medium. Examples of non-temporary computer-readable medium may include, but are not limited to, one or more types of hardware memory, non-temporary tangible media (e.g., one or more magnetic storage disks, one or more optical disks, one or more Universal Sync Bus (USB) flash drives), computer system memory, or random access memory (such as Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), and Extended Data Output Random Access Memory (EDO RAM)).

[0115] As illustrated in Figure 1, System 100 is provided by exemplary embodiments to facilitate uplink transmission from User Equipment 120. While the system may be configured in various ways, one embodiment of the system is depicted in Figure 1 and includes both User Equipment 120 and a base station 140 configured to communicate via uplink and downlink transmit and receive beams. Although one User Equipment and one base station are depicted, the system may, in other embodiments, include additional User Equipment and base stations, and User Equipment 120 and / or base station 140 may communicate with the additional User Equipment and base stations. In one or more embodiments, User Equipment 120 and base station 140 may be configured to support, for example, 5G, 5G Advanced, or 6G. In one or more embodiments, System 100 may support carrier aggregation and / or dual connectivity. As described below, the system is configured to transmit messages and reports such as reconfiguration messages, radio resource control messages, MAC control element messages, and / or downlink control information messages.

[0116] The data transmitted between the user equipment 120 and the base station 140 via the uplink and downlink beams may be any of a wide variety of data, including, but not limited to, digital image data including video data and audio data, as well as data provided by sensors, radar, telescopes, and radio receivers. In at least some examples, the data is encoded before being transmitted via the uplink and downlink beams and decoded upon reception. The received data may be used for a variety of purposes, such as presentation to the user, storage of the data for subsequent use, and / or providing the data to one or more applications, such as applications that perform statistical inference on the data for various purposes, including object recognition, image classification, spectral sensing, speech transcription, and / or event prediction or detection.

[0117] The user equipment 120 (also called UE, user device, user terminal, terminal device, etc.) in Figure 1 illustrates a type of device to which resources on a wireless interface are allocated and assigned. User equipment 120 typically refers to portable computing devices, including but not limited to wireless mobile communication devices that operate with or without a subscriber identification module (SIM), including: mobile stations (cell phones), smartphones, personal digital assistants (PDAs), handsets, devices using wireless modems (such as alarm or measuring devices), laptops and / or touchscreen computers, tablets, game consoles, notebooks, and multimedia devices. User equipment 120 may also be a device capable of operating in an Internet of Things (IoT) network, a scenario in which an object is provided with the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction. User equipment 120 (or, in some embodiments, a Layer 3 relay node) is configured to perform one or more user equipment functions. User equipment 120 may also be called a subscriber unit, mobile station, remote terminal, access terminal, user terminal, or user equipment (UE), but this is merely a description of some of the names or devices.

[0118] The base station 140 in Figure 1 may include, for example, a remote radio head (RRH), a transmit / receive point (TRP), an access point, a node B (e.g., a gNB), or other transmission sources. The base station 140 may be configured to communicate with user equipment 120 over a network.

[0119] The base station 140 may operate as part of a cell group. The base station 140 may be part of a master cell group (MCG) or a secondary cell group (SCG). In one or more embodiments, the base station 140 may operate as a primary cell within an MCG or SCG. In one or more embodiments, the base station 140 may operate as a secondary cell within an MCG or SCG. In one or more alternative embodiments, the user equipment 120 may move to a new location requiring a new MCG or SCG. In one or more embodiments, the user equipment 120 may utilize selective activation of an SCG or MCG. In one or more embodiments, the user equipment 120 moving cells may result in a change of the previous source PSCell to a target PSCell with conditional PSCell modification. In one or more embodiments, the PSCell addition / modification configuration configured for selective activation is maintained on the user equipment side and the network side.

[0120] Figure 2 depicts an exemplary device 200 that may be configured to function as a user device 120 or a base station 140. As shown in Figure 2, the device includes, is associated with, or communicates with a processing circuit 220, a memory 240, and a communication interface 260. The processing circuit 220 may communicate with the memory device 240 via a bus to allow information to flow between components of the device. The memory device may be non-temporary and may include, for example, one or more volatile and / or non-volatile memories. In other words, for example, the memory device may be an electronic storage device (e.g., a computer-readable storage medium) including gates configured to store data (e.g., bits) that may be obtainable by a machine (e.g., a processing circuit such as a computing device). The memory device may be configured to store information, data, content, applications, or instructions, etc., to enable the device to perform various functions according to the exemplary embodiments of the disclosure. For example, the memory device may be configured to buffer input data for processing by the processing circuit. Additionally or alternatively, the memory device may be configured to store instructions for execution by the processing circuit.

[0121] In some embodiments, the device 200 may be embodied in various computing devices as described above. However, in some embodiments, the device may be embodied as a chip or chipset. In other words, the device may include one or more physical packages (e.g., chips) containing materials, components, and / or wiring on a structural assembly (e.g., a baseboard). The structural assembly can provide physical strength, size conservation, and / or limitations on electrical interaction for the component circuits contained thereon. The device may therefore, in some cases, be configured to implement embodiments on a single chip or as a single "system on a chip". Thus, in some cases, the chip or chipset may constitute means for performing one or more operations to provide the functions described herein.

[0122] The processing circuit 220, also referred to as a processor, may be embodied in several different ways. For example, the processing circuit may be embodied as one or more of various hardware processing means, such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing element with or without an associated DSP, or various other circuits including integrated circuits such as an ASIC (Application-Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), a microcontroller unit (MCU), a hardware accelerator, or a dedicated computer chip. Thus, in some embodiments, the processing circuit may include one or more processing cores configured to operate independently. A multicore processing circuit may enable multiprocessing within a single physical package. Additionally or alternatively, the processing circuit may include one or more processors configured in tandem via a bus to enable independent instruction execution, pipeline processing, and / or multithreaded processing.

[0123] In exemplary embodiments, the processing circuit 220 may be configured to execute instructions stored in the memory device 240, or instructions that are otherwise accessible to the processing circuit. Alternatively or additionally, the processing circuit may be configured to execute hardcoded functions. Thus, whether configured by hardware or software, or a combination thereof, the processing circuit may represent entities (e.g., physically embodied within the circuit) that are configured accordingly and capable of operating according to embodiments of the disclosure. For example, when the processing circuit is embodied as an ASIC or FPGA, the processing circuit may be hardware specifically configured to perform the operations described herein. Alternatively, as another example, when the processing circuit is embodied as an instruction executor, the instructions may specifically configure the processor to perform the algorithms and / or operations described herein when the instructions are executed. However, in some cases, the processing circuit may be the processor of a specific device (e.g., an image or video processing system) configured to use embodiments by further configuration of the processing circuit through instructions for performing the algorithms and / or operations described herein. The processing circuit may include, in particular, a clock, an arithmetic logic unit (ALU), and logic gates configured to support the operation of the processing circuit.

[0124] The communication interface 260 may be any means, such as a device or circuit embodied in either hardware or a combination of hardware and software, configured to receive and / or transmit data containing media content in the form of video or image files or one or more audio tracks. In this regard, the communication interface may include, for example, one antenna (or more antennas) and supporting hardware and / or software to enable communication with a wireless communication network. Additionally or alternatively, the communication interface may include circuitry for interacting with the antenna to cause the transmission of signals through the antenna or to process the reception of signals received through the antenna. In some environments, the communication interface may alternatively or additionally support wired communication. For example, the communication interface may include a communication modem and / or other hardware / software to support communication via cable, digital subscriber line (DSL), universal serial bus (USB), or other mechanisms.

[0125] Looking at Figure 3, the signaling diagram illustrates process 300 for a source node initiated inter-source node conditional PSCell change (CPC) using the previous method. In this exemplary embodiment, user equipment 120 is connected to source master node 380 and source secondary node 385 and uses selective activation to change to target secondary node 390 from among other potential target secondary nodes 395.

[0126] In one or more embodiments, in operation 305, the source secondary node 385 instructs the master node that a change is required on the source secondary node. In one or more embodiments, the source secondary node 385 sends the master node a list of IDs of target secondary nodes that will be contacted to prepare the target PSCell. In one or more embodiments, the source secondary node proposes a list of PSCells to be prepared by the target secondary nodes. In one or more embodiments, the source secondary node provides CPC execution conditions for each proposed target PSCell.

[0127] In one or more embodiments, in operation 310, the master node 380 sends an add request to the target secondary node 390. In one or more embodiments, the master node 380 sends a secondary node add request to the target secondary node 390 in response to the fact that the target secondary node 390 is included in the list of target secondary nodes sent in operation 305.

[0128] In one or more embodiments, in operation 315, the master node 380 sends an add request to the other target secondary node 395. In one or more embodiments, the master node 380 sends a secondary node add request to the other target secondary node 395 in response to the fact that the target secondary node 395 is included in the list of target secondary nodes sent in operation 305.

[0129] In one or more embodiments, in operation 320, the target secondary node 390 determines a candidate target PSCell to prepare from a list of PSCells proposed by the source secondary node 385 to be prepared.

[0130] In one or more embodiments, during operation 325, the other target secondary node 395 determines a candidate target PSCell to prepare from the list of PSCells proposed by the source secondary node 385 to be prepared.

[0131] In one or more embodiments, during operation 330, the target secondary node 390 transmits the CPC configuration for each prepared target PSCell to the master node 380. In one or more embodiments, during operation 330, the target secondary node 390 transmits the ID of each prepared target PSCell to the master node 380.

[0132] In one or more embodiments, during operation 335, the other target secondary node 395 transmits the CPC configuration for each prepared target PSCell to the master node 380. In one or more embodiments, during operation 335, the other target secondary node 395 transmits the ID of each prepared target PSCell to the master node 380.

[0133] In one or more embodiments, during operation 340, the master node 380 transmits a conditional (re)configuration, including the CPC configuration of the candidate target PSCell, to the user device 120. In one or more embodiments, during operation 340, the master node 380 transmits CPC execution conditions to the user device 120 that correspond to the transmitted CPC configuration of the candidate target PSCell.

[0134] In one or more embodiments, during operation 345, the user device sends a confirmation to the master node 380 that the user device 120 has received a conditional (re)configuration.

[0135] In one or more embodiments, during operation 350, the master node 380 sends a confirmation to the source secondary node 385 that the user device 120 has received (re)configuration. In one or more embodiments, the master node 380 confirms with the source secondary node 385 that secondary node change preparation is in order.

[0136] In one or more embodiments, in operation 355, the user device 120 evaluates the CPC execution conditions corresponding to the transmitted CPC configuration of the candidate target PSCell. In one or more embodiments, in operation 355, the user device 120 evaluates the CPC execution conditions of the prepared target PSCell.

[0137] In one or more embodiments, in operation 360, the CPC execution conditions are met for a candidate target PSCell. In one or more embodiments, in operation 360, the CPC execution conditions are met for a candidate target PSCell in the target secondary node 390. In one or more embodiments, the CPC execution conditions include CP(A)C execution conditions. In one or more embodiments, the CPC configuration is executed.

[0138] In one or more embodiments, during operation 365, the user device 120 sends a message to the master node 380 instructing it to perform the CPC configuration. In one or more embodiments, the message includes an embedded secondary node radio resource control reconfiguration complete message to the target source node corresponding to the performed CPC configuration. In one or more embodiments, the radio resource control reconfiguration complete message is directed to the target source node 390.

[0139] In one or more embodiments, during operation 370, the master node 380 transmits a notification to the target source node indicating completion of secondary node radio resource control reconfiguration corresponding to the executed CPC configuration. In one or more embodiments, the notification of completion of radio resource control reconfiguration is sent to the target source node 390.

[0140] In one or more embodiments, during operation 375, the user device 320 completes a random access procedure to the target source node 390.

[0141] Figure 4 illustrates scenario 400 for the selective activation of the SCG. As illustrated in Figure 4, the user device 120 is mobile across a group of PSCells under the overlay coverage of the New Radio Primary Cell 410.

[0142] In one or more embodiments, the user device is served by the primary cell 410 and PSCell 420 (Pscell 2). In one or more embodiments, the user device 120 is configured with selective CPAC activation for target PSCells 430 and 440 (Pscell 3 and Pscell 4). In one or more embodiments, when the user device moves forward to PSCell 430, a CPC configuration for target PSCell 430 is executed when the execution conditions associated with PSCell 430 are met. In one or more embodiments, after execution, the user device 120 maintains a CPC configuration for PSCell 440 in preparation for subsequent PSCell changes. However, in earlier embodiments, the user device 120 does not necessarily maintain a CPC configuration for PSCell 430. This can be technically disadvantageous in situations where there are subsequent PSCell changes that move away from PSCell 430 and later return to PSCell 430.

[0143] Now, looking at Figure 5, a scenario 500 is described in which it is not clear that the PSCell configuration is retained in the previous embodiments. In this scenario in the previous embodiments, the user device receives CPC configurations for PSCell 420, PSCell 430, and PSCell 440. In one or more previous embodiments, the user device performs a CPC configuration for PSCell 420 and retains the CPC configurations for PSCell 430 and PSCell 440. However, the user device 120 may then release the CPC configuration for PSCell 420. In one or more previous embodiments, if the user device 120 leaves PSCell 420 and later returns to PSCell 420, PSCell 420 must provide a “self-configuration,” which is the CPC configuration of PSCell 420 that can be used by the user device to switch back to the serving PSCell after a change in the PSCell. In one or more previous embodiments, this unnecessary preparation of self-configuration results in the same configuration that the user device 120 originally performed on the PSCell 420. The lack of retention of this configuration by the user device 120 causes unnecessary delays, and the preparation of self-configuration may waste system resources.

[0144] Now, looking at Figure 6, the signaling diagram illustrates process 600 for a source node-initiated conditional PSCell change (CPC) between source nodes, in an exemplary embodiment where the executed CPC configuration is maintained. In this embodiment, user equipment 120 is connected to source master node 380 and source secondary node 385 and switches to a PSCell connected to either target secondary node 390 or target secondary node 395. In this exemplary embodiment, user equipment 120 switches to PSCell 1-1 associated with secondary node 390, but in other embodiments, user equipment may switch to PSCell 2-1 or PSCell 2-2 associated with target secondary node 395.

[0145] In one or more embodiments, in operation 305, the source secondary node 385 instructs the master node 380 that a change is required on the source secondary node. In one or more embodiments, the source secondary node 385 sends the master node 380 a list of IDs of target secondary nodes that will be contacted to prepare the target PSCell. In one or more embodiments, the source secondary node 385 proposes a list of PSCells to be prepared by the target secondary nodes. In one or more embodiments, the source secondary node provides CPC execution conditions for each proposed target PSCell.

[0146] In one or more embodiments, in operation 310, the master node 380 sends an add request to the target secondary node 390. In one or more embodiments, the master node 380 sends a secondary node add request to the target secondary node 390 in response to the fact that the target secondary node 390 is included in the list of target secondary nodes sent in operation 305.

[0147] In one or more embodiments, in operation 610, the target secondary node 390 sets a flag indicating that if a CPC configuration has been performed for the prepared target PSCell 1-1, that configuration should be preserved. In one or more embodiments, the flag instructs the source master node 380 to configure the user device 120 to remember and preserve the PSCell change configuration being performed. In one or more embodiments, the target secondary node 390 determines a candidate target PSCell to prepare. In one or more embodiments, the target secondary node 390 decides to prepare PSCell 1-1.

[0148] In one or more embodiments, in operation 315, the master node 380 sends an add request to the target secondary node 395. In one or more embodiments, the master node 380 sends a secondary node add request to the target secondary node 395 in response to the fact that the target secondary node 395 is included in the list of target secondary nodes sent in operation 305.

[0149] In one or more embodiments, in operation 615, the target secondary node 395 sets a flag indicating that if one of the CPC configurations for the prepared target PSCells 2-1 and 2-2 has been executed, those configurations should be preserved. In one or more embodiments, the flag is instructed to the source master node 380 to configure the user device 120 to save and preserve the PSCell change configuration being executed. In one or more embodiments, the target secondary node 390 determines which candidate target PSCells to prepare. In one or more embodiments, the target secondary node 390 decides to prepare PSCells 2-1 and 2-2.

[0150] In one or more embodiments, during operation 620, the source master node 380 sends a source node modification request to the target secondary node 390.

[0151] In one or more embodiments, in operation 625, the target secondary node 390 transmits the CPC configuration for the prepared target PSCell 1-1 to the master node 380. In one or more embodiments, in operation 330, the target secondary node 390 transmits the ID of the prepared target PSCell 1-1 to the master node 380.

[0152] In one or more embodiments, during operation 630, the source master node 380 sends a source node modification request to the target secondary node 395.

[0153] In one or more embodiments, during operation 635, the target secondary node 395 transmits the CPC configuration for each prepared target PSCell 2-1 and 2-2 to the master node 380. In one or more embodiments, during operation 335, the other target secondary nodes 395 transmit the ID of each prepared target PSCell to the master node 380.

[0154] In one or more embodiments, during operation 640, the master node 380 transmits a conditional (re)configuration, including the CPC configuration of the candidate target PSCell, to the user device 120. In one or more embodiments, during operation 640, the master node 380 transmits CPC execution conditions corresponding to the transmitted CPC configuration of the candidate target PSCell to the user device 120. In one or more embodiments, the master node 380 transmits a flag to preserve the PSCell configuration after execution. In one or more embodiments, the flag is indicated to the user device for each configuration provided by the master node 380.

[0155] In one or more embodiments, during operation 345, the user device sends a confirmation to the master node 380 that the user device 120 has received a conditional (re)configuration.

[0156] In one or more embodiments, in operation 360, the CPC execution conditions are met for PSCell 1-1 in the secondary node 390. In one or more embodiments, in operation 360, the CPC execution conditions are met for PSCell 1-1 in the target secondary node 390. In one or more embodiments, the CPC execution conditions include CP(A)C execution conditions. In one or more embodiments, the CPC configuration is executed. In one or more embodiments, the user device executes the CPC toward the secondary node 390.

[0157] In one or more embodiments, during operation 365, user device 120 sends a message to master node 380 instructing it to perform a CPC configuration. In one or more embodiments, the message includes an embedded secondary node radio resource control reconfiguration completion message for the target source node corresponding to the performed CPC configuration. In one or more embodiments, the radio resource control reconfiguration completion message is for target source node 390.

[0158] In one or more embodiments, in operation 645, the user device maintains a CPC configuration for a new serving cell PSCell 1-1. In one or more embodiments, the configuration is maintained as a self-configuration. In one or more embodiments, the configuration is maintained as instructed by the radio resource control configuration.

[0159] In one or more embodiments, during operation 350, the master node 380 sends a confirmation to the source secondary node 385 that the user device 120 has received (re)configuration. In one or more embodiments, the master node 380 confirms to the source secondary node 385 that the secondary node change is ready. In one or more embodiments, the master node 380 sends a confirmation to the source secondary node 385 that the secondary node radio resource control reconfiguration is complete.

[0160] In one or more embodiments, during operation 370, the master node 380 transmits to the target secondary node a notification of completion of secondary node radio resource control reconfiguration corresponding to the performed CPC configuration. In one or more embodiments, the notification of completion of radio resource control reconfiguration is made to the target secondary node 390. In one or more embodiments, the master node 380 transmits to the target secondary node 390 an acknowledgment that the user equipment 120 has received the (re)configuration. In one or more embodiments, the master node 380 acknowledges to the source secondary node 390 that the secondary node change is ready.

[0161] In one or more embodiments, during operation 375, the user device 320 completes a random access procedure to the target source node 390.

[0162] In one or more embodiments, the user plane procedure is completed in operation 650.

[0163] In one or more embodiments, operation 655 distributes a user equipment context release from the master node 380 to the source secondary node 385.

[0164] Now, looking at Figure 7, the signaling diagram illustrates an alternative process 700 for a source node-initiated conditional PSCell change (CPC) between source nodes, in an exemplary embodiment where the executed CPC configuration is preserved. In this exemplary embodiment, user equipment 120 is connected to source master node 380 and source secondary node 385 and switches to a PSCell connected to either target secondary node 390 or target secondary node 395. In this exemplary embodiment, user equipment 120 switches to PSCell 1-1 associated with secondary node 390, but in other embodiments, user equipment may switch to PSCell 2-1 or PSCell 2-2 associated with target secondary node 395.

[0165] In one or more embodiments, in operation 305, the source secondary node 385 instructs the master node 380 that a change is required on the source secondary node. In one or more embodiments, the source secondary node 385 sends the master node 380 a list of IDs of target secondary nodes that will be contacted to prepare the target PSCell. In one or more embodiments, the source secondary node 385 proposes a list of PSCells to be prepared by the target secondary nodes. In one or more embodiments, the source secondary node provides CPC execution conditions for each proposed target PSCell.

[0166] In one or more embodiments, in operation 310, the master node 380 sends an add request to the target secondary node 390. In one or more embodiments, the master node 380 sends a secondary node add request to the target secondary node 390 in response to the fact that the target secondary node 390 is included in the list of target secondary nodes sent in operation 305.

[0167] In one or more embodiments, in operation 710, the target secondary node 390 determines a candidate target PSCell to prepare. In one or more embodiments, the target secondary node 390 decides to prepare PSCell 1-1.

[0168] In one or more embodiments, in operation 315, the master node 380 sends an add request to the target secondary node 395. In one or more embodiments, the master node 380 sends a secondary node add request to the target secondary node 395 in response to the fact that the target secondary node 395 is included in the list of target secondary nodes sent in operation 305.

[0169] In one or more embodiments, in operation 715, the target secondary node 390 determines a candidate target PSCell to prepare. In one or more embodiments, the target secondary node 390 decides to prepare PSCell 2-1 and PSCell 2-2.

[0170] In one or more embodiments, during operation 620, the source master node 380 sends a source node modification request to the target secondary node 390.

[0171] In one or more embodiments, in operation 625, the target secondary node 390 transmits the CPC configuration for the prepared target PSCell 1-1 to the master node 380. In one or more embodiments, in operation 330, the target secondary node 390 transmits the ID of the prepared target PSCell 1-1 to the master node 380.

[0172] In one or more embodiments, during operation 630, the source master node 380 sends a source node modification request to the target secondary node 395.

[0173] In one or more embodiments, during operation 635, the target secondary node 395 transmits the CPC configuration for each prepared target PSCell 2-1 and 2-2 to the master node 380. In one or more embodiments, during operation 335, the other target secondary nodes 395 transmit the ID of each prepared target PSCell to the master node 380.

[0174] In one or more embodiments, during operation 340, the master node 380 transmits a conditional (re)configuration, including the CPC configuration of the candidate target PSCell, to the user device 120. In one or more embodiments, during operation 340, the master node 380 transmits CPC execution conditions to the user device 120 that correspond to the transmitted CPC configuration of the candidate target PSCell.

[0175] In one or more embodiments, during operation 345, the user device sends a confirmation to the master node 380 that the user device 120 has received a conditional (re)configuration.

[0176] In one or more embodiments, in operation 355, the user device 120 evaluates the CPC execution conditions corresponding to the transmitted CPC configuration of the candidate target PSCell. In one or more embodiments, in operation 355, the user device 120 evaluates the CPC execution conditions of the prepared target PSCell.

[0177] In one or more embodiments, in operation 360, the CPC execution conditions are met for PSCell 1-1 in the secondary node 390. In one or more embodiments, in operation 360, the CPC execution conditions are met for PSCell 1-1 in the target secondary node 390. In one or more embodiments, the CPC execution conditions include CP(A)C execution conditions. In one or more embodiments, the CPC configuration is executed. In one or more embodiments, the user device executes the CPC toward the secondary node 390.

[0178] In one or more embodiments, during operation 365, user device 120 sends a message to master node 380 instructing it to perform a CPC configuration. In one or more embodiments, the message includes an embedded secondary node radio resource control reconfiguration completion message for the target source node corresponding to the performed CPC configuration. In one or more embodiments, the radio resource control reconfiguration completion message is for target source node 390.

[0179] In one or more embodiments, during operation 350, the master node 380 sends a confirmation to the source secondary node 385 that the user device 120 has received (re)configuration. In one or more embodiments, the master node 380 confirms to the source secondary node 385 that the secondary node change is ready. In one or more embodiments, the master node 380 sends a confirmation to the source secondary node 385 that the secondary node radio resource control reconfiguration is complete.

[0180] In one or more embodiments, during operation 370, the master node 380 transmits to the target secondary node a notification of completion of secondary node radio resource control reconfiguration corresponding to the performed CPC configuration. In one or more embodiments, the notification of completion of radio resource control reconfiguration is made to the target secondary node 390. In one or more embodiments, the master node 380 transmits to the target secondary node 390 an acknowledgment that the user equipment 120 has received the (re)configuration. In one or more embodiments, the master node 380 acknowledges to the source secondary node 390 that the secondary node change is ready.

[0181] In one or more embodiments, during operation 375, the user device 320 completes a random access procedure to the target source node 390.

[0182] In one or more embodiments, in operation 720, the target secondary node 390 triggers the transmission of an indication that the user device is maintaining its own configuration. In one or more embodiments, the indication is sent at any time during the connection. In one or more embodiments, the indication is a radio resource control message. In one or more embodiments, the indication is a MAC control element message. In one or more embodiments, the indication is a downlink control information message.

[0183] In one or more embodiments, during operation 725, the user device maintains a configuration for source PSCell 1-1 based at least on an indication from the target secondary node 390.

[0184] In one or more embodiments, the user plane procedure is completed in operation 650.

[0185] In one or more embodiments, operation 655 distributes the release of the user device context from the master node 380 to the source secondary node 385.

[0186] Now, looking at Figure 8, the signaling diagram illustrates an alternative process 800 for a source node-initiated conditional PSCell change (CPC) between source nodes, in an exemplary embodiment where the executed CPC configuration is preserved. In this exemplary embodiment, user equipment 120 is connected to source master node 380 and source secondary node 385 and switches to a PSCell connected to either target secondary node 390 or target secondary node 395. In this exemplary embodiment, user equipment 120 switches to PSCell 1-1 associated with secondary node 390, but in other embodiments, user equipment may switch to PSCell 2-1 or PSCell 2-2 associated with target secondary node 395. In this exemplary embodiment, the operation prior to operation 810 is equivalent to the operation of process 700 depicted in Figure 7.

[0187] In one or more embodiments, in operation 810, user equipment 120 triggers the transmission of an indication to the target secondary node 390 that serving PSCEll 1-1 has an executed CPC configuration. In one or more embodiments, the indication is sent at any time during the connection. In one or more embodiments, the indication is a radio resource control message. In one or more embodiments, the indication is a MAC control element message. In one or more embodiments, the indication is a downlink control information message.

[0188] In one or more embodiments, during operation 815, the user device retains a configuration for source PSCell 1-1, such as that transmitted in the indication.

[0189] In one or more embodiments, the user plane procedure is completed in operation 650.

[0190] In one or more embodiments, operation 655 distributes the release of the user device context from the master node 380 to the source secondary node 385.

[0191] In an alternative embodiment, user device 120 may be configured with the maximum number of configurations. In one or more embodiments, master node 380 may receive indications from target cells PSCell 1-1, PSCell 2-1, and / or PSCell 2-2 to maintain their configurations. In one or more embodiments, master node 380 may interpret these configurations and send indications to user device 120 indicating which cell configurations to remove. In one or more embodiments, user device 120 may retain all configurations other than those indicated by master node 380 not to be maintained in subsequent CPCs. In one or more embodiments, user device will not perform radio resource control processing on the indicated cell configurations so as to eliminate subsequent radio resource control delays.

[0192] One or more of these embodiments offer technical advantages. In one or more embodiments, the user device 120 that maintains the configuration of the serving PSCell is T RRC_delay This reduces the time to 0ms, and therefore the time required to send the physical random access channel preamble to the target PSCell in the future.

[0193] Figure 9 illustrates an illustrative flowchart for a process 900 performed by a device embodied by user device 120, associated with user device 120, or otherwise communicating with user device 120 (hereinafter generally referred to as "embodied by user device 120") in order to maintain the modified configuration of the primary cell of a conditional secondary cell group being executed.

[0194] As shown in block 910 of Figure 9, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for the user device (120) to receive a reconfiguration message from the master node (380) that includes a set of reconfiguration configurations for primary cells of a conditional secondary cell group (CPC configurations for PSCell 1-1, 2-1, and 2-2 in Figure 6), the set of reconfiguration configurations for primary cells of a conditional secondary cell group includes a set of execution conditions. In one or more embodiments, the set of reconfiguration configurations for primary cells of a conditional secondary cell group includes a plurality of reconfiguration configurations for primary cells of a conditional secondary cell group (CPC configurations for PSCell 1-1, 2-1, and 2-2 in Figure 6), the computer-implemented method according to claim 1.

[0195] As shown in block 920 of Figure 9, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for evaluating a set of execution conditions.

[0196] As shown in block 930 of Figure 9, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for executing one of a set of conditional secondary cell group primary cell modification configurations (one of the CPC configurations for PSCell 1-1, 2-1, and 2-2 in Figure 6) based on an evaluation of a set of execution conditions.

[0197] As shown in block 940 of Figure 9, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for receiving an indication from the master node (380) that the modified configuration of the primary cell of a conditional secondary cell group being performed (the CPC configuration of PSCell 1-1 in Figure 6) is being retained. In one or more embodiments, the reconfiguration message includes an indication that the modified configuration of the primary cell of a conditional secondary cell group being performed (the CPC configuration of PSCell 1-1 in Figure 6) is being retained. In one or more embodiments, the indication that the modified configuration of the primary cell of a conditional secondary cell group being performed is being retained is received from the target secondary node (390) in a second reconfiguration message after execution. In one or more embodiments, the indication includes a radio resource control message. In one or more embodiments, the indication includes a MAC control element message. In one or more embodiments, the indication includes a downlink control information message. In one or more embodiments, an indication that the primary cell modification configurations of a conditional secondary cell group are retained includes an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained, and a set of primary cell modification configurations of the conditional secondary cell group are retained, excluding one or more sets of primary cell modification configurations of the conditional secondary cell group. In one or more embodiments, a reconfiguration message includes an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained. In one or more embodiments, an indication that one or more sets of primary cell modification configurations of the conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

[0198] As shown in block 950 of Figure 9, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for holding the modified configuration of the primary cell of a conditional secondary cell group being performed. In one or more embodiments, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for completing a random access procedure associated with the modified configuration of the primary cell of a conditional secondary cell being performed (the CPC configuration of PSCell 1-1 in Figure 6).

[0199] Figure 10 illustrates an exemplary flowchart for a process 1000 carried out by a device embodied by the base station 140, associated with the base station 140, or otherwise communicating with the base station 140 (hereinafter generally referred to as "embodied by the base station 140"), to trigger the transmission of a set of modified primary cell configurations for a conditional secondary cell group. In one or more embodiments, the base station 140 includes a target secondary node 390. As shown in block 1010 of Figure 10, the device embodied by the base station 140 includes means such as a processing circuit 220 and a communication interface 260 for the target secondary node (target SN1 390 or target SN2 395) to receive a secondary node addition request from a source master node (380).

[0200] As shown in block 1020 of Figure 10, the device embodied by the base station 140 includes means such as a processing circuit 220 and a communication interface 260 for determining a set of primary cells of a secondary cell group (PSCell 1-1 for target SN1, and PSCell 2-1 and 2-2 for target SN2) associated with a set of conditional primary cell modification configurations of a secondary cell group (CPC configurations for PSCell 1-1, 2-1, and 2-2 in Figure 6). In one or more embodiments, the set of conditional primary cell modification configurations of a secondary cell group includes a plurality of conditional primary cell modification configurations (CPC configurations for PSCell 1-1, 2-1, and 2-2).

[0201] As shown in block 1030 of Figure 10, the device embodied by the base station 140 includes means such as a processing circuit 220 and a communication interface 260 for transmitting an indication that a set of conditional secondary cell group primary cell modification configurations (CPC configurations for PSCell 1-1, 2-1, and 2-2) is being performed. In one or more embodiments, the indication that a conditional secondary cell group primary cell modification configuration is being performed is transmitted to the source master node (380) before the execution of the conditional secondary cell group primary cell modification configuration. In one or more embodiments, the indication is transmitted by the source master node (380) to the user equipment (120). In one or more embodiments, the indication that a conditional secondary cell group primary cell modification configuration (CPC for PSCell 0-1 in Figure 6) is being performed is transmitted to the user equipment (120) during the connection period after the execution of the conditional secondary cell group primary cell modification configuration (CPC for PSCell 0-1 in Figure 6). In one or more embodiments, the indication includes a radio resource control message. In one or more embodiments, the indication includes a MAC control element message. In one or more embodiments, the indication includes a downlink control information message.

[0202] As shown in block 1040 of Figure 10, the device embodied by the base station 140 includes means such as a processing circuit 220 and a communication interface 260 for transmitting a set of conditional secondary cell group primary cell modification configurations (CPC configurations for PSCell 1-1, 2-1, and 2-2) to the source master node (380).

[0203] Figure 11 illustrates an illustrative flowchart for an alternative process 1100 performed by a device embodied by user device 120, associated with user device 120, or otherwise communicating with user device 120 (hereinafter generally referred to as "embodied by user device 120"), for maintaining the modified configuration of the primary cell of a conditional secondary cell group being executed.

[0204] As shown in block 1110 of Figure 11, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for the user device (120) to receive a reconfiguration message from the master node (380) that includes a set of modification configurations for the primary cells of a conditional secondary cell group, the set of modification configurations for the primary cells of a conditional secondary cell group includes a set of execution conditions. In one or more embodiments, the set of modification configurations for the primary cells of a conditional secondary cell group includes a plurality of modification configurations for the primary cells of conditional secondary cell groups.

[0205] As shown in block 1120 of Figure 11, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for evaluating a set of execution conditions.

[0206] As shown in block 1130 of Figure 11, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for executing one of a set of conditional secondary cell group modification configurations of the primary cell based on an evaluation of a set of execution conditions.

[0207] As shown in block 1140 of Figure 11, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for sending an indication to another target secondary node (395) that a change configuration of the primary cell of a conditional secondary cell group being performed is being held. In one or more embodiments, the indication that a change configuration of the primary cell of a conditional secondary cell group being performed is being held is sent after execution during the connection period. In one or more embodiments, the indication includes a radio resource control message. In one or more embodiments, the indication includes a MAC control element message. In one or more embodiments, the indication includes an uplink control information message.

[0208] As shown in block 1150 of Figure 11, the device embodied by the user device 120 includes means such as a processing circuit 220 and a communication interface 260 for holding the modified configuration of the primary cell of a conditional secondary cell group being performed. In one or more embodiments, the user device 120 further includes means such as a processing circuit 220 and a communication interface 260 for completing random access procedures associated with the modified configuration of the primary cell of a conditional secondary cell group being performed.

[0209] Figures 9 to 11 illustrate flowcharts depicting methods according to exemplary embodiments of the present disclosure. It will be understood that each block of the flowchart and combinations of blocks within the flowchart may be implemented by various means, such as hardware, firmware, processors, circuits, and / or other communication devices associated with the execution of software that includes one or more computer program instructions. For example, one or more of the procedures described above may be embodied by computer program instructions. In this regard, computer program instructions that embodied the procedures described above may be stored in a memory device 240 of the apparatus using the embodiment and may be executed by a processor 220. As will be understood, any such computer program instruction may be loaded into a computer or other programmable device (e.g., hardware) to produce a machine so that the computer or other programmable device that brings it into use implements the functions specified in the blocks of the flowchart. These computer program instructions may also be stored in computer-readable memory which may instruct a computer or other programmable device to function in a particular way so that the instructions stored in computer-readable memory produce a product whose execution implements the functions specified in the flowchart blocks. Computer program instructions may also be loaded into a computer or other programmable device to cause a series of actions on the computer or other programmable device in order to generate a computer implementation process that provides actions for instructions to be executed on the computer or other programmable device to implement the functions specified in the blocks of the flowchart.

[0210] Therefore, the blocks in a flowchart support combinations of means for performing a specified function, and combinations of actions for performing a specified function. It will also be understood that one or more blocks in a flowchart, and combinations of blocks within a flowchart, may be implemented by a dedicated hardware-based computer system or a combination of dedicated hardware and computer instructions to perform a specified function.

[0211] Many modifications and other embodiments described herein will be recalled by those skilled in the art to which this disclosure relates, having benefited from the teachings presented in the foregoing description and the accompanying drawings. It should therefore be understood that this disclosure is not limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims.

[0212] Furthermore, while the foregoing description and associated drawings illustrate exemplary embodiments in the context of certain exemplary combinations of elements and / or functions, it should be noted that different combinations of elements and / or functions may be provided by alternative embodiments without departing from the scope of the appended claims. In this regard, different combinations of elements and / or functions than those expressly described above are also conceivable, for example, as may be described in some of the appended claims. Certain terms are used herein, but they are used only in a general and descriptive sense and are not intended to be limiting.

Claims

1. Receiving a reconfiguration message from the master node via user equipment, which includes a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group includes a set of execution conditions, Evaluating a set of execution conditions, Based on the evaluation of the set of execution conditions, execute one of the set of change configurations for the primary cell of the conditional secondary cell group, Receiving an indication from the master node that the primary cell change configuration of the conditional secondary cell group being executed will be preserved, To maintain the primary cell change configuration of a conditional secondary cell group that is executed. A computer implementation method that includes this.

2. The computer-implemented method according to claim 1, wherein the reconfiguration message includes an indication that the modified configuration of the primary cell of a conditional secondary cell group being performed is preserved.

3. A computer-implemented method according to claim 1 or 2, wherein an indication that the modified configuration of the primary cell of a conditionally executed secondary cell group is preserved is received from the secondary node in a second reconfiguration message after execution.

4. A computer-implemented method according to any one of claims 1 to 3, wherein the set of change configurations for primary cells of a conditional secondary cell group includes change configurations for primary cells of multiple conditional secondary cell groups.

5. A computer-implemented method according to any one of claims 1 to 4, wherein the indication includes a wireless resource control message.

6. A computer-implemented method according to any one of claims 1 to 5, wherein the indication includes a MAC control element message.

7. A computer-implemented method according to any one of claims 1 to 6, wherein the indication includes a downlink control information message.

8. A computer-implemented method according to any one of claims 1 to 7, further comprising completing a random access procedure associated with a change configuration of the primary cell of a conditional secondary cell that is to be performed.

9. A computer-implemented method according to any one of claims 1 to 8, wherein an indication that the change configuration of the primary cell of a conditionally secondary cell group is retained includes an indication that one or more sets of change configurations of the primary cell of a conditionally secondary cell group are not retained, and a set of change configurations of the primary cell of a conditionally secondary cell group is retained, excluding one or more sets of change configurations of the primary cell of a conditionally secondary cell group.

10. The computer-implemented method according to claim 9, wherein the reconfiguration message includes an indication that one or more of the set of modified configurations for the primary cell of a conditional secondary cell group are not retained.

11. A computer-implemented method according to any one of claims 1 to 10, wherein an indication that one or more sets of change configurations for primary cells in a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

12. The secondary node receives a request to add a secondary node from the source master node, Determining the set of primary cells in a secondary cell group that is associated with a set of change configurations for the primary cells of a conditional secondary cell group, Send an indication that the change configuration of the primary cell of a conditional secondary cell group will be preserved, and Send a set of change configurations for the primary cell of a conditional secondary cell group to the source master node. A computer implementation method that includes this.

13. The computer-implemented method according to claim 12, wherein an indication that the change configuration of the primary cell of a conditional secondary cell group to be executed is preserved is sent to the source master node before the execution of the change configuration of the primary cell of the conditional secondary cell group to be executed.

14. The computer-implemented method according to claim 13, wherein the indication is transmitted to the user device by the source master node.

15. A computer-implemented method according to any one of claims 12 to 14, wherein an indication that a change configuration of the primary cell of a conditionally executed secondary cell group is retained is sent to the user device during the connection period after the change configuration of the primary cell of the conditionally executed secondary cell group has been executed.

16. A computer-implemented method according to any one of claims 12 to 15, wherein the set of modification configurations for primary cells of a conditional secondary cell group includes modification configurations for primary cells of multiple conditional secondary cell groups.

17. A computer-implemented method according to any one of claims 12 to 16, wherein the indication includes a wireless resource control message.

18. A computer-implemented method according to any one of claims 12 to 17, wherein the indication includes a MAC control element message.

19. A computer-implemented method according to any one of claims 12 to 18, wherein the indication includes a downlink control information message.

20. Receiving a reconfiguration message from the master node via user equipment, which includes a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group includes a set of execution conditions, Evaluating a set of execution conditions, Based on the evaluation of the set of execution conditions, execute one of the set of change configurations for the primary cell of the conditional secondary cell group, Sending an indication to another secondary node that the primary cell change configuration of a conditional secondary cell group is preserved, To maintain the primary cell change configuration of a conditional secondary cell group that is executed. A computer implementation method that includes this.

21. A computer-implemented method according to claim 20, wherein an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is preserved is sent after execution during the connection period.

22. The computer-implemented method according to claim 20 or 21, wherein the set of modification configurations for primary cells of a conditional secondary cell group includes modification configurations for primary cells of multiple conditional secondary cell groups.

23. A computer-implemented method according to any one of claims 20 to 22, wherein the indication includes a wireless resource control message.

24. A computer-implemented method according to any one of claims 20 to 23, wherein the indication includes a MAC control element message.

25. A computer-implemented method according to any one of claims 20 to 24, wherein the indication includes an uplink control information message.

26. A computer-implemented method according to any one of claims 20 to 25, further comprising completing a random access procedure associated with a change configuration of the primary cell of a conditional secondary cell group that is performed.

27. A non-temporary computer-readable storage medium, which, when executed by the device, includes a computer instruction causing the device to perform the method according to any one of claims 1 to 11.

28. A non-temporary computer-readable storage medium comprising a computer instruction, when executed by the device, causing the device to perform the method according to any one of claims 12 to 19.

29. A non-temporary computer-readable storage medium, which, when executed by the device, includes a computer instruction causing the device to perform the method according to any one of claims 20 to 26.

30. At least one processor, At least one memory for storing instructions and A user device comprising the following, wherein instructions are executed by at least one processor: Receiving a reconfiguration message from the master node that includes a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group includes a set of execution conditions, Evaluating a set of execution conditions, Based on the evaluation of the set of execution conditions, execute one of the set of change configurations for the primary cell of the conditional secondary cell group, To receive an indication that the primary cell change configuration of a conditionally executed secondary cell group is preserved, To maintain the primary cell change configuration of a conditional secondary cell group that is executed. A user device that performs the task.

31. The user device according to claim 30, wherein the reconfiguration message includes an indication that the modified configuration of the primary cell of a conditional secondary cell group being performed is preserved.

32. The user device according to claim 30 or 31, wherein an indication that the modified configuration of the primary cell of a conditionally executed secondary cell group is preserved is received from the secondary node in a second reconfiguration message after execution.

33. The user device according to any one of claims 30 to 32, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

34. The user device according to any one of claims 30 to 33, wherein the indication includes a wireless resource control message.

35. The user device according to any one of claims 30 to 34, wherein the indication includes a MAC control element message.

36. The user device according to any one of claims 30 to 35, wherein the indication includes a downlink control information message.

37. At least one memory and computer program code are stored in the user's device. Complete the random access procedure associated with the primary cell modification configuration of the conditional secondary cell that is being executed. The user device according to any one of claims 30 to 36, further configured using at least one processor.

38. The user device according to any one of claims 30 to 37, wherein an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is retained includes an indication that one or more sets of change configurations of the primary cell of a conditionally executed secondary cell group are not retained, and a set of change configurations of the primary cell of a conditionally executed secondary cell group is retained, excluding one or more sets of change configurations of the primary cell of a conditionally executed secondary cell group.

39. The user device according to claim 38, wherein the reconfiguration message includes an indication that one or more sets of modified configurations for primary cells in a conditional secondary cell group are not retained.

40. The user device according to any one of claims 30 to 39, wherein an indication that one or more sets of primary cell change configurations for a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

41. At least one processor, At least one memory for storing instructions and A secondary node comprising, where instructions are executed by at least one processor, Receiving a request to add a secondary node from the source master node, Determining the set of primary cells in a secondary cell group that is associated with a set of change configurations for the primary cells of a conditional secondary cell group, Send an indication that the change configuration of the primary cell of a conditional secondary cell group will be preserved, and Send a set of change configurations for the primary cell of a conditional secondary cell group to the source master node. A secondary node that performs this task.

42. The secondary node according to claim 41, wherein an indication that the change configuration of the primary cell of the conditional secondary cell group to be executed is preserved is sent to the source master node before the execution of the change configuration of the primary cell of the conditional secondary cell group to be executed.

43. The secondary node according to claim 42, wherein the indication is transmitted to the user device by the source master node.

44. A secondary node according to any one of claims 41 to 43, wherein an indication that the change configuration of the primary cell of the conditionally performed secondary cell group is retained is sent to the user equipment during the connection period after the change configuration of the primary cell of the conditionally performed secondary cell group has been performed.

45. A secondary node according to any one of claims 41 to 44, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

46. The secondary node according to any one of claims 41 to 45, wherein the indication includes a wireless resource control message.

47. A secondary node according to any one of claims 41 to 46, wherein the indication includes a MAC control element message.

48. The secondary node according to any one of claims 41 to 47, wherein the indication includes a downlink control information message.

49. At least one processor, At least one memory for storing instructions and User equipment equipped with, commands, When executed by at least one processor, Receiving a reconfiguration message from the master node that includes a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group includes a set of execution conditions, Evaluating a set of execution conditions, Based on the evaluation of the set of execution conditions, execute one of the set of change configurations for the primary cell of the conditional secondary cell group, Sending an indication to another secondary node that the primary cell change configuration of a conditional secondary cell group is preserved, To maintain the primary cell change configuration of a conditional secondary cell group that is executed. A user device that performs the task.

50. The user device according to claim 49, wherein an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is preserved is sent after execution during the connection period.

51. The user device according to claim 49 or 50, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

52. The user device according to any one of claims 49 to 51, wherein the indication includes a wireless resource control message.

53. User device according to any one of claims 49 to 52, wherein the indication includes a MAC control element message.

54. User equipment according to any one of claims 49 to 53, wherein the indication includes an uplink control information message.

55. At least one memory and computer program code are stored in the user's device. Complete the random access procedure associated with the primary cell modification configuration of the conditional secondary cell group being executed. The user device according to any one of claims 49 to 54, further configured using at least one processor.

56. A means for receiving a reconfiguration message from a master node, the means comprising a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group comprises a set of execution conditions. A means for evaluating a set of execution conditions, A means for executing one of the sets of modification configurations for the primary cell of a conditional secondary cell group, based on an evaluation of a set of execution conditions, Means for receiving an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is preserved, Means for maintaining the modified configuration of the primary cell in a conditional secondary cell group that is executed User equipment equipped with these features.

57. The user device according to claim 56, wherein the reconfiguration message includes an indication that the modified configuration of the primary cell of a conditional secondary cell group being performed is preserved.

58. The user device according to claim 56 or 57, wherein an indication that the modified configuration of the primary cell of a conditionally executed secondary cell group is preserved is received from the secondary node in a second reconfiguration message after execution.

59. The user device according to any one of claims 56 to 58, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

60. The user device according to any one of claims 56 to 59, wherein the indication includes a wireless resource control message.

61. User device according to any one of claims 56 to 60, wherein the indication includes a MAC control element message.

62. The user device according to any one of claims 56 to 61, wherein the indication includes a downlink control information message.

63. Means for completing random access procedures associated with the modification configuration of the primary cell of a conditionally executed secondary cell. A user device according to any one of claims 56 to 62, further comprising:

64. The user device according to any one of claims 56 to 63, wherein an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is retained includes an indication that one or more sets of change configurations of the primary cell of a conditionally executed secondary cell group are not retained, and a set of change configurations of the primary cell of a conditionally executed secondary cell group is retained, excluding one or more sets of change configurations of the primary cell of a conditionally executed secondary cell group.

65. The user device according to claim 64, wherein the reconfiguration message includes an indication that one or more sets of modified configurations for primary cells in a conditional secondary cell group are not retained.

66. The user device according to any one of claims 56 to 65, wherein an indication that one or more sets of primary cell change configurations for a conditional secondary cell group are not retained is received in a second reconfiguration message after execution.

67. A means for receiving requests to add secondary nodes from the source master node, Means for determining the set of primary cells in a secondary cell group, associated with a set of modified configurations for the primary cells of a conditional secondary cell group, A means for sending an indication that a set of primary cell change configurations for a conditional secondary cell group will be retained, and that the change configurations for the primary cell of the conditional secondary cell group will be retained. A means for sending a set of change configurations for the primary cell of a conditional secondary cell group to the source master node. A secondary node equipped with this feature.

68. The secondary node according to claim 67, wherein an indication that the change configuration of the primary cell of the conditional secondary cell group to be executed is preserved is sent to the source master node before the execution of the change configuration of the primary cell of the conditional secondary cell group to be executed.

69. The secondary node according to claim 68, wherein the indication is transmitted to the user device by the source master node.

70. A secondary node according to any one of claims 67 to 69, wherein an indication that the change configuration of the primary cell of the conditionally performed secondary cell group is retained is sent to the user equipment during the connection period after the change configuration of the primary cell of the conditionally performed secondary cell group is performed.

71. A secondary node according to any one of claims 67 to 70, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

72. The secondary node according to any one of claims 67 to 71, wherein the indication includes a wireless resource control message.

73. A secondary node according to any one of claims 67 to 72, wherein the indication includes a MAC control element message.

74. The secondary node according to any one of claims 67 to 73, wherein the indication includes a downlink control information message.

75. A means for receiving a reconfiguration message from a master node, the means comprising a set of change configurations for the primary cell of a conditional secondary cell group, wherein the set of change configurations for the primary cell of a conditional secondary cell group comprises a set of execution conditions. A means for evaluating a set of execution conditions, A means for executing one of the sets of modification configurations for the primary cell of a conditional secondary cell group, based on an evaluation of a set of execution conditions, A means for sending an indication to another secondary node that the change configuration of the primary cell of a conditionally executed secondary cell group is preserved, Means for maintaining the modified configuration of the primary cell in a conditional secondary cell group that is executed User equipment equipped with these features.

76. User device according to claim 75, wherein an indication that the change configuration of the primary cell of a conditionally executed secondary cell group is preserved is transmitted after execution during the connection period.

77. The user device according to claim 75 or 76, wherein the set of primary cell modification configurations for a conditional secondary cell group includes a plurality of primary cell modification configurations for conditional secondary cell groups.

78. The user device according to any one of claims 75 to 77, wherein the indication includes a wireless resource control message.

79. User device according to any one of claims 75 to 78, wherein the indication includes a MAC control element message.

80. User equipment according to any one of claims 75 to 79, wherein the indication includes an uplink control information message.

81. Means for completing random access procedures associated with the modification configuration of the primary cell of a conditional secondary cell group being executed. A user device according to any one of claims 75 to 80, further comprising:

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