Generating cell configuration information

Abstract

A user equipment of a telecommunications network, comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the user equipment to at least: establish a connection between the user equipment and a first network node of a radio access network, the first network node supporting a first cell; deriving, in the user equipment, a complete configuration of the first cell; receiving, in the user equipment, first delta configuration information and second delta configuration information, the first delta configuration information relating to a cell change from the first cell to the second cell, the second delta configuration information relating to a cell change from the first cell to the third cell; deriving a complete configuration of the second cell to connect to the second cell based on the complete configuration of the first cell and the first delta configuration information in response to a cell change to the second cell; and generating updated second delta configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second delta configuration information being based on configuration information available for the user equipment prior to the cell change to the second cell.

Description

Technical Field

[0001] Each example embodiment relates to generating cell configuration information in a radio telecommunications network. Background Art

[0002] In some radio telecommunications networks, cell changes are facilitated by having configuration information for (a) candidate or target cell(s) for cell change. Although there are techniques for providing such configuration information, they all have their own drawbacks. Accordingly, improved techniques are desired. Summary of the Invention

[0003] The independent claims define the scope of protection sought by the various example embodiments of the present invention. Example embodiments and features (if any) described in this specification that are not within the scope of the independent claims will be construed as examples to assist in understanding the various embodiments of the present invention.

[0004] According to various but not necessarily all example embodiments of the present invention, there is provided a user equipment of a telecommunications network, the user equipment comprising: at least one processor; and at least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: establish a connection between the user equipment and a first network node of a radio access network, the first network node supporting a first cell; derive a complete configuration of the first cell in the user equipment; receive first incremental configuration information and second incremental configuration information in the user equipment, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell; in response to the cell change to the second cell, derive a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell; and generate updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: configuration information available to the user equipment prior to the cell change to the second cell.

[0005] The generation of the updated second incremental configuration information may be based on: the complete configuration of the first cell, the first incremental configuration information, and the second incremental configuration information.

[0006] The generation of the updated second incremental configuration information may be based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

[0007] The generation may occur after the cell change from the first cell to the second cell.

[0008] The generation may occur between the cell change from the first cell to the second cell and a subsequent cell change.

[0009] The generation can identify the differences between the first incremental configuration information when applied to the complete configuration of the first cell and the second incremental configuration information when applied to the complete configuration of the first cell, and can merge these differences into the updated second incremental configuration.

[0010] The generation can identify when an element or parameter in the second incremental configuration information has a value different from the corresponding element or parameter in the first incremental configuration information, and can merge the value different from the second incremental configuration information for this element or parameter into the updated second incremental configuration information.

[0011] The generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and can merge the corresponding element or parameter from the complete configuration of the first cell into the updated second incremental configuration information.

[0012] The generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the complete configuration of the first cell, and can merge an indication that this element or parameter should be removed into the updated second incremental configuration information.

[0013] The instruction can cause the user equipment to at least: in response to a change to another cell of the third cell, derive the complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration to connect to the third cell.

[0014] The instruction can cause the user equipment to at least: in response to a change to another cell of the third cell, repeat the generation of the updated incremental configuration information.

[0015] The instruction can cause the user equipment to at least: use RRC signaling to receive the complete configuration of the first cell, the first incremental configuration information, and / or the second incremental configuration information.

[0016] The first network node can include at least one of the following items, or support the functions of at least one of the following items: base station, 5G gNB, centralized unit, distributed unit, secondary node, source node, or source secondary node.

[0017] The user equipment can support dual connectivity to the master node and the secondary node.

[0018] The first cell can be at least one of the following items: primary-secondary cell, or primary-secondary cell supported by the source secondary node, or source primary-secondary cell, or current serving cell.

[0019] The second cell can be at least one of the following items: primary-secondary cell, or primary-secondary cell supported by the first target secondary node, or target primary-secondary cell, or target serving cell.

[0020] The third cell may be at least one of the following: a primary-secondary cell, or a primary-secondary cell supported by a second target secondary node, or a target primary-secondary cell, or a target serving cell.

[0021] The instruction may cause the user equipment to at least: receive information related to a conditional cell PSCell change for moving from a first cell to a second cell, and perform a random access to the second cell if the condition for the cell PSCell change to the second cell is satisfied.

[0022] The instruction may cause the user equipment to at least: store updated second incremental configuration information when the random access to the second cell is successful, and delete the second incremental configuration information.

[0023] The instruction may cause the user equipment to at least: receive information related to a conditional cell PSCell change for moving from a first cell to a third cell, and perform a random access to the third cell if the condition for the cell PSCell change to the third cell is satisfied.

[0024] The user equipment may be configured for subsequent selective activation.

[0025] The user equipment may be configured using at least one RRC reconfiguration message.

[0026] The instruction may cause the user equipment to at least: receive configuration information for performing L1 measurements.

[0027] The instruction may cause the user equipment to at least: send an L1 measurement report including second cell information to the first cell or the source network node, and receive a trigger to switch to the second cell.

[0028] The user equipment may be configured for dynamic handover.

[0029] According to various but not necessarily all example embodiments of the present invention, there is provided a user equipment of a telecommunication network, the user equipment comprising: at least one processor; and at least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: establish a connection between the user equipment and a first network node of a radio access network, the first network node supporting a first cell; derive a complete configuration of the first cell in the user equipment; receive first incremental configuration information and second incremental configuration information in the user equipment, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell; and further receive updated second incremental configuration information related to a cell change from the second cell to the third cell in the user equipment before the cell change to the second cell.

[0030] The instruction can cause the user equipment to at least: in response to a cell change to a second cell, derive the complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information, so as to connect to the second cell.

[0031] The instruction can cause the user equipment to at least: in response to a subsequent cell change to a third cell, derive the complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration information, so as to connect to the third cell.

[0032] The instruction can cause the user equipment to at least: use RRC signaling to receive the complete configuration of the first cell, the first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information.

[0033] The first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information can be received within a single RRC message.

[0034] The first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information can be received within nested RRC messages.

[0035] The instruction can cause the user equipment to at least: receive the updated second incremental configuration information when being connected to the first cell and before determining to perform a cell change.

[0036] The instruction can cause the user equipment to at least: also receive the fourth incremental configuration information related to the cell change from the second cell to the first cell.

[0037] The instruction can cause the user equipment to at least: in response to a cell change to a second cell, derive the complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information, so as to connect to the second cell, and subsequently, in response to a cell change to a third cell, derive the complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration information, so as to connect to the third cell.

[0038] The instruction can cause the user equipment to at least: in response to a cell change to a cell, derive the complete configuration of the cell based on the complete configuration of the current serving cell and the corresponding incremental configuration information or the corresponding updated incremental configuration information for the cell change, so as to connect to the cell.

[0039] According to various but not necessarily all example embodiments of the present invention, there is provided a method for implementing a subsequent cell change for a user equipment that supports connectivity to a radio access network, the method comprising: establishing a connection between the user equipment and a first network node of the radio access network, the first network node supporting a first cell; deriving a complete configuration of the first cell in the user equipment; receiving, in the user equipment, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from the first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell; in response to the cell change to the second cell, deriving a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell; and generating updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: configuration information available to the user equipment prior to the cell change to the second cell.

[0040] The generation of the updated second incremental configuration information may be based on: the complete configuration of the first cell, the first incremental configuration information, and the second incremental configuration information.

[0041] The generation of the updated second incremental configuration information may be based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

[0042] The generation may occur after the cell change from the first cell to the second cell.

[0043] The generation may occur between the cell change from the first cell to the second cell and a subsequent cell change.

[0044] The generation may identify: the difference between the first incremental configuration information when the first incremental configuration information is applied to the complete configuration of the first cell and the second incremental configuration information when the second incremental configuration information is applied to the complete configuration of the first cell, and may incorporate these differences into the updated second increment configuration.

[0045] The generation may identify when an element or parameter in the second incremental configuration information has a value different from the corresponding element or parameter in the first incremental configuration information, and may incorporate the value different from the second incremental configuration information for the element or parameter into the updated second incremental configuration information.

[0046] The generation may identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and may incorporate the corresponding element or parameter from the complete configuration of the first cell into the updated second incremental configuration information.

[0047] The generation can identify when an element or parameter in the first delta configuration information has no corresponding element or parameter in the complete configuration of the first cell, and can incorporate an indication that the element or parameter should be removed into the updated second delta configuration information.

[0048] The method can include: in response to a change to another cell of a third cell, deriving the complete configuration of the third cell based on the complete configuration of the second cell and the updated second delta configuration to connect to the third cell.

[0049] The method can include: in response to a change to another cell of a third cell, repeating the generation of the updated delta configuration information.

[0050] The method can include: using RRC signaling to receive the complete configuration of the first cell, the first delta configuration information, and / or the second delta configuration information.

[0051] The first network node can include at least one of the following items, or support the functions of at least one of the following items: a base station, a 5G gNB, a centralized unit, a distributed unit, a secondary node, a source node, or a source secondary node.

[0052] The user equipment can support dual connectivity to a master node and a secondary node.

[0053] The first cell can be at least one of the following: a primary-secondary cell, or a primary-secondary cell supported by a source secondary node, or a source primary-secondary cell, or a current serving cell.

[0054] The second cell can be at least one of the following: a primary-secondary cell, or a primary-secondary cell supported by a first target secondary node, or a target primary-secondary cell, or a target serving cell.

[0055] The third cell can be at least one of the following: a primary-secondary cell, or a primary-secondary cell supported by a second target secondary node, or a target primary-secondary cell, or a target serving cell.

[0056] The method can include: receiving information related to a conditional cell PSCell change for moving from the first cell to the second cell, and performing random access to the second cell if the condition for the cell PSCell change to the second cell is satisfied.

[0057] The method can include: when the random access to the second cell is successful, storing the updated second delta configuration information and deleting the second delta configuration information.

[0058] The method may include: receiving information related to a conditional cell PSCell change for moving from a first cell to a third cell, and performing a random access to the third cell if the condition for the cell PSCell change to the third cell is satisfied.

[0059] The user equipment may be configured for subsequent selective activation.

[0060] The user equipment may be configured using at least one RRC reconfiguration message.

[0061] The method may include; receiving configuration information for performing L1 measurements.

[0062] The method may include: sending an L1 measurement report including second cell information to the first cell or the source network node, and receiving a trigger to handover to the second cell.

[0063] The user equipment may be configured for dynamic handover.

[0064] According to various but not necessarily all example embodiments of the present invention, a non-transitory computer-readable medium is provided, the non-transitory computer-readable medium including program instructions stored thereon for at least performing the following: establishing a connection between a user equipment and a first network node of a radio access network, the first network node supporting a first cell; deriving a complete configuration of the first cell in the user equipment; receiving, in the user equipment, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell; in response to the cell change to the second cell, deriving a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell; and generating updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: configuration information available to the user equipment prior to the cell change to the second cell.

[0065] The instructions may have and perform optional features of the above method.

[0066] According to various but not necessarily all exemplary embodiments of the present invention, a method for implementing a subsequent cell change for a user equipment that supports connectivity to a radio access network is provided. The method includes: establishing a connection between the user equipment and a first network node of the radio access network, the first network node supporting a first cell; deriving a complete configuration of the first cell in the user equipment; receiving, in the user equipment, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from the first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell; and before the cell change to the second cell, also receiving, in the user equipment, updated second incremental configuration information related to the cell change from the second cell to the third cell.

[0067] The method may include: in response to the cell change to the second cell, deriving a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell.

[0068] The method may include: in response to a subsequent cell change to the third cell, deriving a complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration information to connect to the third cell.

[0069] The method may include: using RRC signaling to receive the complete configuration of the first cell, the first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information.

[0070] The first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information may be received within a single RRC message.

[0071] The first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information may be received within nested RRC messages.

[0072] The updated second incremental configuration information may be received while connected to the first cell and before determining to perform a cell change.

[0073] The method may include: also receiving fourth incremental configuration information related to a cell change from the second cell to the first cell.

[0074] The method may include: in response to the cell change to the second cell, deriving a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell, and subsequently, in response to the cell change to the third cell, deriving a complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration information to connect to the third cell.

[0075] The method may include: in response to a cell change to a cell, deriving a complete configuration of the cell to connect to the cell based on a complete configuration of a current serving cell and corresponding delta configuration information or corresponding updated delta configuration information for the cell change.

[0076] According to various but not necessarily all example embodiments of the present invention, there is provided a non-transitory computer-readable medium including program instructions stored thereon for at least performing the following: establishing a connection between a user equipment and a first network node of a radio access network, the first network node supporting a first cell; deriving a complete configuration of the first cell in the user equipment; receiving, in the user equipment, first delta configuration information and second delta configuration information, the first delta configuration information being related to a cell change from the first cell to a second cell, the second delta configuration information being related to a cell change from the first cell to a third cell; and receiving, in the user equipment, updated second delta configuration information related to a cell change from the second cell to the third cell before the cell change to the second cell.

[0077] The instructions may have and perform optional features of the above method.

[0078] According to various but not necessarily all example embodiments of the present invention, there is provided a first network node of a telecommunication network, the first network node including: at least one processor; and at least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: receive, in the first network node, first delta configuration information and second delta configuration information, the first delta configuration information being related to a cell change from the first cell to a second cell, the second delta configuration information being related to a cell change from the first cell to a third cell; and generate updated second delta configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second delta configuration information being based on: configuration information available to the first network node before the cell change to the second cell.

[0079] The instructions may cause the first network node to at least: generate updated first delta configuration information for performing a cell change from the third cell to the second cell, the generation of the updated second delta configuration information being based on: configuration information available to the first network node before the cell change to the second cell.

[0080] The generation of the updated second delta configuration information, and / or the updated first delta configuration information, may be based on: the complete configuration of the first cell, the first delta configuration information, and the second delta configuration information.

[0081] The generation of the updated second incremental configuration information can be based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

[0082] The generation of the updated first incremental configuration information can be based on: the complete configuration of the first cell, the complete configuration of the third cell, and the first incremental configuration information.

[0083] This generation can occur before a cell change from the first cell to the second cell or the third cell.

[0084] This generation can identify the differences between the first incremental configuration information when the first incremental configuration information is applied to the complete configuration of the first cell and the second incremental configuration information when the second incremental configuration information is applied to the complete configuration of the first cell, and can merge these differences into the updated second incremental configuration and / or the updated third incremental configuration information.

[0085] This generation can identify when an element or parameter in the second incremental configuration information has a value different from the corresponding element or parameter in the first incremental configuration information, and can merge the value different from the second incremental configuration information for this element or parameter into the updated second incremental configuration information.

[0086] This generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and can merge the corresponding element or parameter from the complete configuration of the first cell into the updated second incremental configuration information.

[0087] This generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the complete configuration of the first cell, and can merge an indication that this element or parameter should be removed into the updated second incremental configuration information.

[0088] This generation can identify when an element or parameter in the first incremental configuration information has a value different from the corresponding element or parameter in the second incremental configuration information, and can merge the value different from the first incremental configuration information for this element or parameter into the updated first incremental configuration information.

[0089] This generation can identify when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the first incremental configuration information, and can merge the corresponding element or parameter from the complete configuration of the second cell into the updated first incremental configuration information.

[0090] This generation can identify when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the complete configuration of the second cell, and can merge an indication that this element or parameter should be removed into the updated first incremental configuration information.

[0091] The first incremental configuration information, and / or the first incremental configuration information can be received using an SN addition request confirmation or a handover request confirmation message.

[0092] The first network node can include at least one of the following items, or support the functions of at least one of the following items: a base station, a 5G gNB, a central unit, a distributed unit, a secondary node, a source node, or a source secondary node.

[0093] The user equipment can support dual connectivity to a master node and a secondary node.

[0094] The first cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a source secondary node, or a source primary secondary cell, or a current serving cell.

[0095] The second cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a first target secondary node, or a target primary secondary cell, or a target serving cell.

[0096] The third cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a second target secondary node, or a target primary secondary cell, or a target serving cell.

[0097] The instruction can cause the user equipment to at least: use RRC signaling to send the complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information.

[0098] The complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information can be received within a single RRC message.

[0099] The complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information can be received within a nested RRC message.

[0100] According to various but not necessarily all example embodiments of the present invention, there is provided a method for implementing a cell change for a user equipment that supports connectivity to a radio access network, the method comprising: receiving, in a first network node, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from a first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell; and generating updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: configuration information available to the first network node before the cell change to the second cell.

[0101] The method may further comprise: generating updated first incremental configuration information for performing a cell change from the third cell to the second cell, the generation of the updated second incremental configuration information being based on: configuration information available to the first network node before the cell change to the second cell.

[0102] The generation of the updated second incremental configuration information, and / or the updated first incremental configuration information, may be based on: the complete configuration of the first cell, the first incremental configuration information, and the second incremental configuration information.

[0103] The generation of the updated second incremental configuration information may be based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

[0104] The generation of the updated first incremental configuration information may be based on: the complete configuration of the first cell, the complete configuration of the third cell, and the first incremental configuration information.

[0105] The generation may occur before the cell change from the first cell to the second cell or the third cell.

[0106] The generation may identify: the differences between the first incremental configuration information when the first incremental configuration information is applied to the complete configuration of the first cell and the second incremental configuration information when the second incremental configuration information is applied to the complete configuration of the first cell, and may incorporate these differences into the updated second increment configuration, and / or the updated second incremental configuration information.

[0107] The generation may identify when an element or parameter in the second incremental configuration information has a value different from the corresponding element or parameter in the first incremental configuration information, and may incorporate the value different from the second incremental configuration information for the element or parameter into the updated second incremental configuration information.

[0108] The generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and can merge the corresponding element or parameter of the complete configuration from the first cell into the updated second incremental configuration information.

[0109] The generation can identify when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the complete configuration of the first cell, and can merge an indication that the element or parameter should be removed into the updated second incremental configuration information.

[0110] The generation can identify when an element or parameter in the first incremental configuration information has a value different from the corresponding element or parameter in the second incremental configuration information, and can merge the value different from the first incremental configuration information for the element or parameter into the updated first incremental configuration information.

[0111] The generation can identify when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the first incremental configuration information, and can merge the corresponding element or parameter of the complete configuration from the second cell into the updated first incremental configuration information.

[0112] The generation can identify when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the complete configuration of the second cell, and can merge an indication that the element or parameter should be removed into the updated first incremental configuration information.

[0113] The first incremental configuration information, and / or the first incremental configuration information can be received using an SN addition request confirmation or a handover request confirmation message.

[0114] The first network node can include at least one of the following items, or support the functions of at least one of the following items: a base station, a 5G gNB, a centralized unit, a distributed unit, a secondary node, a source node, or a source secondary node.

[0115] The user equipment can support dual connectivity to the master node and the secondary node.

[0116] The first cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a source secondary node, or a source primary secondary cell, or a current serving cell.

[0117] The second cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a first target secondary node, or a target primary secondary cell, or a target serving cell.

[0118] The third cell can be at least one of the following: a primary secondary cell, or a primary secondary cell supported by a second target secondary node, or a target primary secondary cell, or a target serving cell.

[0119] The method may include: using RRC signaling to send the complete configuration of a first cell, first delta configuration information, updated first delta configuration information, second delta configuration information, and / or updated second delta configuration information.

[0120] The complete configuration of the first cell, the first delta configuration information, the updated first delta configuration information, the second delta configuration information, and / or the updated second delta configuration information may be received within a single RRC message.

[0121] The complete configuration of the first cell, the first delta configuration information, the updated first delta configuration information, the second delta configuration information, and / or the updated second delta configuration information may be received within nested RRC messages.

[0122] According to various but not necessarily all example embodiments of the present invention, there is provided a non-transitory computer-readable medium including program instructions stored thereon for at least performing the following: receiving, in a first network node, first delta configuration information and second delta configuration information, the first delta configuration information being related to a cell change from a first cell to a second cell, and the second delta configuration information being related to a cell change from the first cell to a third cell; and generating updated second delta configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second delta configuration information being based on: configuration information available to the first network node prior to the cell change to the second cell.

[0123] The instructions may have and perform optional features of the above method.

[0124] Additional specific and preferred aspects are set forth in the appended independent and dependent claims. The features of the dependent claims may be combined with the features of the independent claims in combinations other than those explicitly listed in the claims, as appropriate.

[0125] Where features of a device providing a function are described, it should be understood that this includes features of a device that provides the function or is adapted or configured to provide the function. BRIEF DESCRIPTION OF THE DRAWINGS

[0126] Some example embodiments will now be described with reference to the drawings, in which:

[0127] Figure 1 Illustrates a configuration mismatch after a cell change;

[0128] Figure 2 Illustrates how a newly generated delta configuration (i.e., ΔConfig3') can be applied to a current serving cell configuration (i.e., Config2) to effect a further cell change;

[0129] Figure 3 It is also illustrated how the newly generated incremental configuration (i.e., ΔConfig3') can be applied to the current serving cell configuration (i.e., Config2) to effect additional cell changes;

[0130] Figure 4 An example implementation process of generating an updated incremental configuration (ΔConfig3') is illustrated, which can be applied to the current serving cell configuration (Config2) to effect a change from cell 2 to cell 3;

[0131] Figure 5 Example operations of a user equipment and a network node, and message passing during optional activation are illustrated;

[0132] Figure 6 Example operations of a user equipment and a network node, and message passing for low layer triggered mobility (LTM) are illustrated, and only the gNB - to - gNB scenario is shown;

[0133] Figure 7 Example operations of a user equipment and a network node, and message passing for optional activation are illustrated;

[0134] Figure 8 Example operations of a user equipment and a network node, and message passing for LTM are illustrated, and only the gNB - to - gNB scenario is shown;

[0135] Figure 9 Illustrates sending a newly generated incremental radio resource configuration (RRC) model to the UE ( Figure 7 step 7 in Figure 8 and

[0136] Figure 10 Illustrates the RRC messages to which the incremental signaling is applied; and

[0137] Figure 11 Illustrates an example signaling flow for a secondary node (SN) change initiated by the SN. Detailed Description

[0138] Before discussing the example embodiments in more detail, an overview will first be provided. Some example embodiments relate to cell changes in a radio telecommunications network. A user equipment can typically be connected to a first cell or source cell. One or more target cells are provided to which the user equipment can connect in a cell change from the first cell. The user equipment is provided with incremental configurations for the target cells. These incremental configurations can be applied to the configuration currently being used for the first cell so that the user equipment can connect to the target cell. Additionally, updated incremental configurations are typically provided. These updated incremental configurations can then be applied after a cell change from the first cell to a target cell so that the user equipment can connect to another cell (which can be any other target cell, or even the first cell) after the cell change. The updated incremental configurations are typically retained together with the associated incremental configurations, where the associated incremental configurations are only overwritten when they are no longer needed. These updated incremental configurations can be provided by the user equipment itself, which generates the updated incremental configurations from configuration information and incremental configurations, or the updated incremental configurations can also be provided by the network, which generates the updated incremental configurations from configuration information and incremental configurations and sends them to the user equipment. When provided by the network, different updated incremental configurations can be provided for different combinations of the source cell and the target cell. This approach enables the user equipment to quickly switch from cell to cell without the need to receive updated incremental configurations from the network each time.

[0139] Incremental Configuration - Overview

[0140] When using incremental configurations, some example embodiments provide general enhancements. In an example incremental configuration method, for a user equipment (UE), configuration parameters for its radio interface operation are provided via a radio resource configuration (RRC) reconfiguration message in a radio telecommunications network, such as a 3GPP-based network (currently deployed in LTE and 5G networks and above) and / or other networks. Configuration parameters provided from the network (NW) are marked or indicated to be stored until new values are received from the network. These parameters are marked as "need M" in a signaling message. During mobility, the target cell configuration is provided to the UE, and the UE only gives the parameters to be changed. For all other parameters, the UE continues to use the existing values. New parameters provided as part of a cell change are referred to as "incremental configurations". The incremental configurations are used by the network for cell changes to minimize configuration changes during mobility. Only in cases where there are problems with modifying existing parameters will the network provide a full configuration containing all parameters again.

[0141] In the RRC message, an example where incremental signaling is applied is the RRCReconfiguration message described in Section 6.2.2 of TS 38.331. Its details are in Figure 10is illustrated in. As described above, some information elements (IEs) for parameters require M. Requiring M means that the UE maintains the value of the IE (which is explained in Section 6.1.2 of TS 38.331). In short, delta signaling can be provided on radioBearerConfig, CellGroupConfig, measConfig, etc., as described in more detail below.

[0142] 3GPP TS 38.331 v17.2.0 (2022-09)

[0143] 11.2 Inter-node RRC Messages

[0144] 11.2.2 Message Definitions

[0145] - CG-Config

[0146] This message is used to transmit the SCG radio configuration generated by the SgNB or SeNB. It can also be used by the CU to request the DU to perform certain actions, such as requesting the DU to perform a new lower layer configuration.

[0147] Direction: Secondary gNB or eNB to primary gNB or eNB, alternatively CU to DU. scg-CellGroupConfig

[0148] Contains the RRCReconfiguration message (only contains secondaryCellGroup and / or measConfig and / or otherConfig and / or conditionalReconfiguration and / or bap-Config and / or iab-IP-AddressConfigurationList):

[0149] - To be sent to the UE, used when the SCG is established or modified (only when the SCG is not released by the SN), and is (fully) generated by the (target) SgNB. In this case, the SN sets the RRCReconfiguration message according to Article 6, for example, regarding the "require" or "Cond" statements.

[0150] Or

[0151] - Includes the UE's current SCG configuration, when provided in response to a query from the MN, or in an SN-triggered SN change, to enable delta signaling by the target SN. In this case, the SN sets the RRCReconfiguration message according to Article 11.2.3.

[0152] If the SCG (re)configuration, or SCG configuration query, or SN-triggered SN change is not performed, this field does not exist, e.g., in case of inter-node capability / configuration coordination that does not result in an SCG (re)configuration towards the UE. This field also does not exist when the SCG release is triggered by the SN. This field does not apply to NE-DC.

[0153] scg-CellGroupConfigEUTRA

[0154] Includes the E-UTRA RRCConnectionReconfiguration message specified in TS 36.331

[10] . In the specification of this release, the E-UTRA RRC message can only include the field scg-Configuration:

[0155] - To be sent to the UE to (re)configure the SCG configuration when establishing or modifying the SCG (only when the SCG is not released by the SN), (fully) generated by the (target) SeNB. In this case, the SN sets the scg-Configuration within the EUTRA RRCConnectionReconfiguration message according to clause 6 in TS 36.331

[10] , e.g., regarding the "required" or "Cond" statements.

[0156] Or

[0157] - Includes the UE's current SCG configuration when provided in response to a query from the MN, or in an SN-triggered SN change, to enable incremental signaling by the target SN.

[0158] If the SCG (re)configuration, or SCG configuration query, or SN-triggered SN change is not performed, this field does not exist, e.g., in case of inter-node capability / configuration coordination that does not result in an SCG (re)configuration towards the UE. This field also does not exist when the SCG release is triggered by the SN. This field is only used in NE-DC.

[0159] scg-RB-Config

[0160] Contains the IE RadioBearerConfig:

[0161] - To be sent to the UE to (re)configure the SCG RB configuration when establishing or modifying the SCG, (fully) generated by the (target) SgNB or SeNB. In this case, the SN sets the RadioBearerConfig according to clause 6, e.g., regarding the "required" or

[0162] "Cond" statements.

[0163] or

[0164] - The current SCG RB configuration of the UE, when provided in response to a query from the MN, or in an SN-triggered SN change, or in an SN-triggered SN release, or a bearer type change between an SN-terminated bearer and an MN-terminated bearer for SN termination, to enable incremental signaling by the MN or the target SN. In this case, the SN sets RadioBearerConfig according to Subclause 11.2.3.

[0165] If an SCG (re)configuration, or an SCG configuration query, or an SN-triggered SN change, or an SN-triggered SN release is not performed, e.g., during inter-node capability / configuration coordination that does not result in an SCG RB (re)configuration, then this field does not exist.

[0166] - CG-ConfigInfo

[0167] This message is used by the master eNB or gNB to request the SgNB or SeNB to perform certain actions, e.g., establish, modify, or release an SCG. This message may include additional information, e.g., to assist the SgNB or SeNB in setting up the SCG configuration. It may also be used by the CU to request the DU to perform certain actions, e.g., establish or modify an MCG or an SCG.

[0168] Direction: from the master eNB or gNB to the secondary gNB or eNB, alternatively from the CU to the DU.

[0169] mcg-RB-Config

[0170] Contains all fields in the IE RadioBearerConfig used in the MN, used by the SN to support incremental configuration to the UE (i.e., when the MN does not use the full configuration option), for bearer type change between an MN-terminated bearer with NR PDCP and an SN-terminated bearer. It is also used to indicate PDCP replication-related information (whether replication is configured and if so, whether it is initially activated) for split bearers terminated at the MN during an SN addition / modification process. Otherwise, this field does not exist.

[0171] scg-RB-Config

[0172] Contains all fields in the IE RadioBearerConfig used in the SN, to allow the target SN to use incremental configuration to the UE, e.g., during an SN change. This field is signaled during an SN change unless the MN uses the full configuration option. Otherwise, this field does not exist.

[0173] sourceConfigSCG

[0174] All current SCG configurations that are used by the target SN to construct the delta configuration to be sent to the UE (e.g., during SN change). This field contains the RRCReconfiguration message, i.e., including secondaryCellGroup and measConfig. Unless the MN uses the full configuration option, this field is signaled during SN change. Otherwise, this field will not exist.

[0175] 3GPP TS 37.340 v17.2.0 (2022-09)

[0176] 10.5 Secondary node change (initiated by MN / SN)

[0177] 10.5.2 MR-DC SN-initiated conditional SN change with 5GC

[0178] The SN-initiated conditional SN change procedure is used for CPC configuration and CPC execution.

[0179] The SN-initiated conditional SN change procedure can also be initiated by the source SN to modify the existing CPC configuration, or to trigger the release of the candidate SN by canceling all prepared PSCells at the candidate SN and releasing the CPC-related UE context at the candidate SN.

[0180] Figure 11 An example signaling flow for the SN-initiated conditional SN change is shown:

[0181] 1. The source SN initiates the conditional SN change procedure by sending a SN change request message containing a CPC initiation indication. This message also contains the (one or more) candidate node IDs, and

[0182] may include the SCG configuration (to support delta configuration), and contains measurement results, which may include cells that are not CPC candidates. This message also includes a proposed list of PSCell candidates recommended by the source SN, including execution conditions, an upper limit on the number of PSCells that can be prepared by each candidate SN, and may also include the SCG measurement configuration for CPC (e.g., the (one or more) measurement IDs to be used for CPC).

[0183] 2 / 3. MN requests each (multiple) candidate SN to allocate resources for the UE through the (multiple) SN addition procedure, indicating that the request is for CPAC, and the measurement result may include cells received from the source SN to the candidate SN that are not CPC candidates, and indicating the proposed PSCell candidate list received from the source SN, but not including the execution conditions. In the PSCell list proposed by the source SN, the candidate SN determines the list of (multiple) PSCs to be prepared (considering the maximum number indicated by the MN), and for each prepared PSCell, the candidate SN determines the SCG SCell, and provides the MN with the new corresponding SCG radio resource configuration in the NR RRCReconfiguration** message included in the SgNB addition request confirmation message. If data forwarding is required, the candidate SN provides the MN with the data forwarding address. The candidate SN includes an indication of the complete or incremental RRC configuration, as well as a list of prepared PSCell IDs for the MN. The candidate SN can accept or reject each candidate cell proposed by the source SN, i.e., it cannot configure any alternative candidates.

[0184] 6. MN sends an RRCReconfiguration message including the CPC configuration to the UE, i.e., a list of RRCReconfiguration* messages and associated execution conditions, where each RRCReconfiguration** message contains the SCG configuration received from the candidate SN in step 3, as well as a possible MCG configuration. In addition, the RRCReconfiguration message may also include an updated MCG configuration, as well as an NR RRCReconfiguration*** message generated by the source SN, e.g., conditional measurements required for the configuration.

[0185] 7. The UE applies the RRCReconfiguration message received in step 6, stores the CPC configuration, and responds to the MN with an RRCReconfigurationComplete message, which may include an NRRRCReconfigurationComplete*** message. If the UE cannot comply with the configuration (part of it) included in the RRCReconfiguration message, it performs the reconfiguration failure procedure.

[0186] 10. The UE starts to evaluate the execution conditions. If the execution conditions of a candidate PSCell are met, the UE applies the RRCReconfiguration* message corresponding to the selected candidate PSCell and sends an RRCReconfigurationComplete* message, which includes the RRCReconfigurationComplete** message for the selected candidate PSCell and the information of the SN that enables the MN to identify the selected candidate PSCell.

[0187] 11a - 11c. The MN triggers the MN-initiated SN release procedure to notify the source SN to stop providing user data to the UE, triggers the Xn-U address indication procedure to notify the source SN of the SN address of the selected candidate PSCell, and starts late data forwarding if applicable.

[0188] 12a - 12c. If the RRC connection reconfiguration procedure is successful, the MN notifies the SN of the selected candidate PSCell via the SN reconfiguration complete message (including the SNRRCReconfigurationComplete** message). The MN sends one or more SN release request messages to cancel the CPC (if configured) in one or more other candidate SNs. One or more other candidate SNs confirm the release request.

[0189] 13. The UE synchronizes with the PSCell indicated in the RRCReconfiguration* message applied in step 10.

[0190] In the case of implementing a network with subsequent or continuous selective activation possibilities, as Figure 5 shown, in order not to cancel the configured CPC for one or more other candidate SNs, steps 12b and 12c above may not be executed.

[0191] Key requirements for selective activation and dynamic handover in the context of L1 / L2-based inter-cell mobility (also known as Low-Layer Triggered Mobility (LTM)) targets are: storing multiple cell group configurations (or target cell configurations) at the UE; configuration changes should be made with minimal interruption and preferably without or with minimal additional reconfiguration; selecting cell groups based on radio conditions or other criteria. Conditional activation of cell groups is used in Rel.17-based L1 / L2 inter-cell mobility (LTM) or based on L1 measurements. Additionally, 3GPP has agreed to support incremental signaling in Rel.18 for both selective activation and dynamic handover in LTM. The relevant protocols from RAN2#119bis are: 3GPP protocol for selective activation: confirm that our goal is to support incremental configuration, i.e., a known reference is required. 3GPP protocol for LTM: for L1 / L2 mobility, candidate configurations that will be supported are incremental configurations on top of the reference configuration. For the future, study whether the reference configuration is a separate reference configuration or, for example, the current configuration.

[0192] Incremental Configuration - Current Method

[0193] One scenario for selective activation or dynamic handover in LTM is to use the UE's configuration for conditional PSCell addition / change (CPAC) / LTM as a starting point and ensure the existence of CPAC / LTM-related configurations after the initial cell change is executed. In this case, the candidate target cell configurations provided to the UE as part of the CPAC / LTM configuration can be incremental configurations on top of the current serving (Secondary Cell Group) SCG configuration, i.e., the configuration is defined relative to the current serving cell configuration. After CPAC / LTM is performed on a target cell, the serving cell configuration will be changed to the new cell configuration. The stored CPAC / LTM configuration (which is an "incremental" configuration corresponding to the previous serving cell configuration) cannot be used for another CPAC / LTM execution. Therefore, after the initial execution, if the above issues are not resolved, the previously provided configurations (i.e., CPAC / LTM configurations) will not work because they are incremental configurations compared to the previous serving cell configuration, rather than compared to the current (new) serving cell configuration. This is in Figure 1More detailed illustrations are shown in the figure. As shown in the figure, the UE is initially served by cell 1 and stores the complete configuration (Config1) for serving cell 1. The UE is provided with delta configurations (ΔConfig2, ΔConfig3) for target cells 2 and 3, that is, only the configuration (Config1) for serving cell 1 needs to be changed to be served by cell 2 or 3 instead. When the UE moves from the current serving cell 1 to the target serving cell 2, it applies the delta configuration (ΔConfig2) for target cell 2 to the configuration (Config1) for the current serving cell 1 and stores the complete configuration (Config2 - in this case, replacing B(1) with B(2) and C(1) with C(2)) for serving cell 2. However, when the UE moves from the current serving cell 2 to target cell 3, it takes the current serving cell configuration as Config2, and applying ΔConfig3 relative to Config2 will result in an undesired / wrong configuration, thus causing a configuration mismatch between the UE and the network side (C(2) should be C(1), but is changed to C(2) when applying the delta configuration (ΔConfig2) for target cell 2). This is because ΔConfig3 is the delta configuration provided by the network to the UE relative to Config1 (the initial serving cell configuration at the preparation stage when providing the delta configuration), rather than the delta configuration relative to Config2.

[0194] Incremental Configuration - Generation after Cell Change

[0195] In some example embodiments, the new delta configuration(s) are generated by a network element (e.g., a base station or network element responsible for access, such as nodeB (NB) and / or the UE) based on the previous cell configuration(s) and the delta configuration(s) provided relative to the previous cell configuration(s). The newly generated delta configuration(s) are such that they can be applied to the current serving cell configuration to enable additional cell changes to occur. In other words, the current serving cell configuration always acts as a reference configuration to which the newly generated delta configuration(s) are applied. In some example embodiments, the new delta configuration(s) are generated according to the requirements of the UE. In some example embodiments, the new delta configuration(s) for target cells relative to different serving cells are generated by the base station or network element responsible for access and are provided to the UE for subsequent use. Although the generation of the new delta configuration(s) will now be described in more detail with reference to a specific type of cell change, it should be understood that this method is applicable to many types of cell changes or handovers.

[0196] Figure 2 and Figure 3The figure illustrates an example configuration and shows how a network element (in this example, a UE) generates new incremental configurations and how the newly generated incremental configurations (i.e., ΔConfig3') can be applied to the current serving cell configuration to effect a cell change from cell 2 to cell 3.

[0197] As Figure 2 shown, the UE is initially served by cell 1 and stores the complete configuration (Config1) for serving cell 1. The UE is provided with incremental configurations (ΔConfig2, ΔConfig3, i.e., only the configuration for serving cell 1 (Config1) needs to be changed to be served by cell 2 or 3 instead). Of course, it can be understood that there can be more than two target cells, and thus more than two incremental configurations can be provided. When the UE moves from the current serving cell 1 to the target serving cell 2, it applies the incremental configuration for target cell 2 (ΔConfig2) to the configuration for the current serving cell 1 (Config1) and stores the complete configuration for serving cell 2 (Config2 - in this case, replacing B(1) with B(2) and C(1) with C(2)).

[0198] Then, the UE generates new incremental configurations (ΔConfig1', ΔConfig3', i.e., only the configuration for serving cell 2 (Config2) needs to be changed to be served by cell 1 or 3 instead) for target cells 1 and 3. In this example, ΔConfig1' stores B(1) and C(1), and when B(1) and C(1) are applied to Config2, Config1 will be provided. ΔConfig3' stores B(3) and C(1), and when B(3) and C(1) are applied to Config2, Config3 will be provided. As described above, in the case of providing more than two target cells, additional new incremental configurations can be generated. In addition, the incremental configurations for target cells 1 and 3 (ΔConfig1, ΔConfig3) are not immediately overwritten by the new incremental configurations for target cells 1 and 3 (ΔConfig1', ΔConfig3').

[0199] Therefore, if the UE moves from the current serving cell 2 to the target serving cell 3, it applies the incremental configuration for the target cell 3 (ΔConfig3') to the configuration for the current serving cell 2 (Config2), and stores the complete configuration for the serving cell 3 (Config3). Then, the UE generates new incremental configurations for the target cells 1 and 2 in a similar manner as described above. Similarly, if the UE moves from the current serving cell 2 to the target serving cell 1, it applies the incremental configuration for the target cell 1 (ΔConfig1') to the configuration for the current serving cell 2 (Config2), and stores the complete configuration for the serving cell 1 (Config1). Then, the UE generates new incremental configurations for the target cells 1 and 2 in a similar manner as described above.

[0200] As Figure 3 shown, the UE is initially served by cell 1 and stores the complete configuration for the serving cell 1 (Config1). The UE is provided with the incremental configurations for the target cells 2 and 3 (ΔConfig2, ΔConfig3, i.e., only the configuration for the serving cell 1 (Config1) needs to be changed to be served by cell 2 or 3 instead). When the UE moves from the current serving cell 1 to the target serving cell 2, it applies the incremental configuration for the target cell 2 (ΔConfig2) to the configuration for the current serving cell 1 (Config1), and stores the complete configuration for the serving cell 2 (Config2 - in this case, replacing B(1) with B(2) and C(1) with C(2), and adding E(2)).

[0201] Then, the UE generates new incremental configurations for the target cells 1 and 3 (ΔConfig1', ΔConfig3', i.e., only the configuration for the serving cell 2 (Config2) needs to be changed to be served by cell 1 or 3 instead). In this example, ΔConfig1' stores B(1), C(1), and E(R) (which means that the configuration E needs to be completely removed), and when B(1), C(1), and E(R) are applied to Config2, Config1 will be provided. ΔConfig3' stores B(3), C(1), and E(R), and when B(3), C(1), and E(R) are applied to Config2, Config3 will be provided.

[0202] Therefore, if the UE moves from the current serving cell 2 to the target serving cell 3, it applies the incremental configuration for the target cell 3 (ΔConfig3') to the configuration for the current serving cell 2 (Config2), and stores the complete configuration for the serving cell 3 (Config3). Then, the UE generates new incremental configurations for the target cells 1 and 2 in a similar manner as described above. Similarly, if the UE moves from the current serving cell 2 to the target serving cell 1, it applies the incremental configuration for the target cell 1 (ΔConfig1') to the configuration for the current serving cell 2 (Config2), and stores the complete configuration for the serving cell 1 (Config1). Then, the UE generates new incremental configurations for the target cells 1 and 2 (and any other target cells) in a similar manner as described above.

[0203] A similar method can be applied on the network side to generate new incremental configurations as needed.

[0204] The advantage of this method is that after moving from serving cell 1, Config1 is maintained only until the network element determines the new incremental configurations (ΔConfig1' and ΔConfig3') for the new target cells. Thereafter, the network element can decide to flush the memory containing Config1. Additionally, the new incremental configurations can be determined from information that is already available to the network element and no additional signaling is required.

[0205] Figure 4 FIG. illustrates a method for generating new incremental configurations by a network element. For each element in the applied ΔConfigX, the following items are performed (which can be done in parallel):

[0206] · If the element of ΔConfigX is not equal to the corresponding element of ΔConfigY, then the element in ΔConfigY is maintained in ΔConfigY'. In Figure 4 , B(2) in ΔConfig2 is not equal to the corresponding element (B(3)) of ΔConfig3, and thus B(3) of ΔConfig3 is maintained in ΔConfig3'.

[0207] · If the element of ΔConfigX does not exist in ΔConfigY, then it is added to the updated configuration, i.e., ΔConfigY' with the previous cell configuration values. In Figure 4 , C(2) of ΔConfig2 does not exist in ΔConfig3, so C(1) from Config1 is added to ΔConfig3'.

[0208] · If an element of ΔConfigX does not exist in both ΔConfigY and the previous cell configuration, then add an element that indicates that the corresponding element should be removed in ΔConfigY'. In Figure 4 , E(2) of ΔConfig2 does not exist in both ΔConfig3 and Config1, so E(R) is added to ΔConfig3'. In other words, the word element

[0209] "remove" means that the element should be removed for the target cell configuration.

[0210] Therefore, Figure 3 ΔConfig3' in is generated based on the above implementation process. It will be understood that new ΔConfig' for other target cells can be generated in the same way.

[0211] In addition, it will be understood that ΔConfigY' can be generated from the previous cell configuration, ConfigX (current cell configuration), and ΔConfigY, because ΔConfigX can be deduced and vice versa.

[0212] UE Implementation

[0213] According to the example embodiment, the UE generates (a) new delta configuration(s) after each cell change so that the (a) new delta configuration(s) can be applied to the current cell configuration to effect a further cell change. This is described using the signaling flowcharts in Figure 5 and Figure 6 .

[0214] Figure 5 is for selective activation, and it should be noted that the cell (PSCell) change (CPC) initiated by the secondary node (SN) is shown only as an example. However, the example embodiment is equally applicable to the CPC initiated by the master node (MN) without any process change.

[0215] At step 1, a determination is made of a change from the current serving cell PSCell 0-1 (to which the UE is connected) to potential target or candidate cells PSCell 1-1, PSCell 2-1, and PSCell 2-2. This determination is based, for example, on UE measurements. At steps 2 to 6, messages are exchanged to provide this information to the UE such that the change can occur. At steps 7 and 8, the change occurs and the UE applies the increment for PSCell 1-1 to the configuration for PSCell 0-1. At step 9, the UE generates an updated or new increment configuration for PSCell 0-1, PSCell 2-1, and PSCell 2-2, which increment configuration can be applied to the configuration for PSCell 1-1. At steps 10 to 15, the change to PSCell 1-1 is completed. It should be understood that, depending on the desired implementation, the generation of the new increment configuration can occur at any point between steps 8 and 15.

[0216] At step 16, a determination is made of a change from PSCell 1-1 to PSCell 2-1. At step 17, the change occurs and the UE applies the new increment configuration for PSCell 2-1 to the configuration for PSCell 1-1. At step 18, the UE generates an additional updated or new increment configuration for PSCell 0-1, PSCell 1-1, and PSCell 2-2, which increment configuration can be applied to the configuration for PSCell 2-1. At steps 19 to 23, the change to PSCell 2-1 is completed. Again, it should be understood that, depending on the desired implementation, the generation of the additional new increment configuration can occur at any point between steps 17 and 23.

[0217] The network can be regarded as a network with the possibility of subsequent or consecutive selective activation, which enables the UE to perform, for example, two cell changes one by one based on a configuration received in step 6 via, for example, an RRCReconfiguration message, for example, from PSCell 0-1 to PSCell 1-1, and then to PSCell 2-1. The message includes, for example, (a) condition(s) defining cell changes from PSCell 0-1 to PSCell 1-1, from PSCell 0-1 to PSCell 2-1, from PSCell 1-1 to PSCell 2-1, and from PSCell 1-1 to PSCell 0-1. The UE monitors the corresponding condition(s). For example, when connected to PSCell0-1, the condition(s) for cell changes from PSCell 0-1 to PSCell 1-1 and from PSCell 0-1 to PSCell 2-1, and if the condition for the cell change to PSCell 1-1 holds, the UE applies the cell change to PSCell 1-1. Thereafter, when connected to PSCell 1-1, the UE monitors the condition(s) for cell changes from PSCell 1-1 to PSCell 2-1 and from PSCell 1-1 to PSCell 0-1, and if the condition for the cell change to PSCell 2-1 holds, the UE applies the cell change to PSCell 2-1. The cell change to PSCell 2-1 is a secondary cell change or a subsequent cell change or a consecutive cell change.

[0218] Figure 6 is for LTM and shows only the gNB-inter scenario. However, the example embodiments are equally applicable within a gNB (i.e., within a centralized unit (CU) between distributed units (DUs) and within a DU within a CU). For the latter case, gNB-1, gNB-2, and gNB-3 ( Figure 6 in) represent the same gNB, and cell 1, cell 2, and cell 3 will be under the same (for the within-DU case) or different DUs (for the between-DUs case).

[0219] At step 1, the UE is connected to cell 1. At steps 2 to 11, a handover from cell 1 to cell 2 is determined, and messages are exchanged to provide the UE with this information so that the change can occur. At steps 12 and 13, the UE applies the incremental configuration for cell 2 to the configuration for cell 1, and the change to cell 2 occurs. At step 14, the UE generates an updated or new incremental configuration for cell 3 (and optionally a new incremental configuration for cell 1), which can be applied to the configuration for cell 2.

[0220] At steps 15 and 16, a handover from cell 2 to cell 3 is initiated. At steps 17 and 18, the UE applies the new incremental configuration for cell 3 to the configuration for cell 2, and the change to cell 3 occurs. Optionally, the UE then generates additional new or updated incremental configurations for cells 1 and 2, which can be applied to the configuration for cell 3 if additional handovers occur.

[0221] The potential advantages of this method will now be explained. The UE may not require any additional air interface signaling for incremental configuration, e.g., after each handover, the UE can update the existing incremental configuration(s) and keep them valid; after each handover, the UE can receive the new incremental configuration(s) without any additional complexity. This method may not require any additional signaling between network entities (the network entities do not need to provide new configurations). As the number of preparations increases, the complexity grows linearly (expected complexity). This method may not require any additional memory: there is no need to combine incremental configurations (no cell pairs for increments); there is no need to maintain a single (for the initial increment) or multiple base (for the increments provided after handovers) configurations; the network does not need to track the base configurations that the UE needs to maintain. The UE applies the RRC configuration, for example, in a single step, as the incremental configuration is available when needed: the incremental configuration can be updated after each handover without delaying any handover process. This method is compatible with updating the serving cell configuration: if the serving cell updates its configuration and retains the incremental configuration (the incremental configuration can be updated to retain the expected target cell configuration), the same update solution can be adopted.

[0222] NW Implementation

[0223] According to an example embodiment, the NB (e.g., gNB) generates new incremental configurations such that if the new incremental configuration(s) are applied to the current configuration after a handover, they will be valid. Generally, new incremental configurations are generated for each possible handover cell (in other words, for the current source cell and target cell and for those target cells when making handovers to new source cells and target cells, including the initial source cell). This means that the UE does not need to generate new incremental configurations after a cell change, but can instead refer to and apply the new incremental configurations provided by the network. This is illustrated using the signaling flowcharts in Figure 7 and Figure 8 is for selective activation, and it should be noted that SN-initiated CPC is shown only as an example. However, the example embodiments are equally applicable to MN-initiated CPC without any process changes.

[0224] Figure 7

[0225] ​At steps 1 to 5, determine the change from PSCell 0-1 to PSCell 1-1 or PSCell 2-1. Exchange cell configurations and delta configurations between the source base station and the target base station.

[0226] At step 6, the source MN may also generate a single set of modified new or updated delta configurations for PSCell 1-1, PSCell 2-1, and PSCell 2-2, which contains values for all affected parameters obtained from the received delta configurations and PSCell 0-1. In this case, the modified delta configurations for each target cell will include a set of the same parameters. The set of parameters is all the affected parameters from each delta configuration. In this case, 3 target delta configurations are sufficient.

[0227] At step 7, these modified delta configurations are included in the RRC reconfiguration message.

[0228] At steps 8 to 15, the UE changes from PSCell 0-1 to PSCell 1-1 by applying the PSCell 1-1 new delta configuration to the PSCell 0-1 configuration.

[0229] At steps 16 to 22, the UE changes from PSCell 1-1 to PSCell 2-1 by applying the PSCell 2-1 new delta configuration to the PSCell 1-1 configuration. It should be understood that a hybrid approach is possible, where the UE also generates new delta configurations when changing cells in a similar manner as described above. This approach can be useful when the new delta configurations provided by the network are incomplete.

[0230] Figure 8 Is for LTM, and only shows the inter-gNB scenario as an example. However, the example embodiments are equally applicable within a gNB (i.e., within DU and within CU between DUs and within DU within CU). Here, gNB-1, gNB-2, and gNB-3 represent the same gNB, and cells 1, 2, and 3 will be under the same (for the within-DU scenario) or different DUs (for the inter-DU scenario).

[0231] At step 1, the UE is connected to cell 1.

[0232] At steps 2 to 6, cells 2 and 3 are prepared for handover. gNB-2 and gNB3 provide their respective delta configurations with respect to the current configuration of cell 1.

[0233] At step 7, gNB-1 generates an updated delta configuration for cell 3 (and optionally for cell 1), which can be applied to the cell 2 configuration after a handover to cell 2. Similarly, gNB-1 can generate an updated delta configuration for cell 2 (and optionally for cell 1), which can be applied to the cell 3 configuration after a handover to cell 3.

[0234] At step 8, the delta configuration and the updated delta configuration for the target cell are provided together with the RRC reconfiguration message. At step 8, these are stored in the UE.

[0235] At steps 11 to 14, a handover from cell 1 to cell 2 is performed. The UE applies the delta for cell 2 to the configuration for cell 1 to obtain the configuration for cell 2.

[0236] At steps 15 to 18, a handover from cell 2 to cell 3 is performed. The UE applies the updated delta for cell 3 to the configuration for cell 2 to obtain the configuration for cell 3.

[0237] Similarly, it can be understood that a hybrid approach is possible, where the UE also generates new delta configurations when the cell changes in a manner similar to that described above. This approach can be useful when the new delta configurations provided by the network are incomplete.

[0238] According to an example embodiment, the NW sends the newly generated deltas in the form of a nested configuration. For example, each candidate cell contains the delta configuration of another candidate cell. This modeling is as Figure 9 shown.

[0239] According to an example embodiment, not all candidate cell configurations are in the form of delta configurations. In other words, some configurations are delta configurations with respect to the current serving cell, while some configurations are complete configurations.

[0240] Advantages of the NW-related method include: the UE stores all possible delta configurations (e.g., the delta required to move from cell 1 to cell 2, the delta required to move from cell 2 to cell 3, the delta required to move from cell 2 to cell 1); and the network has better control.

[0241] Those skilled in the art will readily recognize that the steps of the various above-described methods can be performed by a programmed computer. In this context, some embodiments also aim to cover a program storage device, such as a digital data storage medium, which is machine or computer-readable and encodes a machine-executable or computer-executable program of instructions, where the instructions perform some or all of the steps of the above-described methods. The program storage device can be, for example, a digital memory, a magnetic storage medium such as magnetic disks and tapes, a hard disk drive, or an optically readable digital data storage medium. Embodiments also aim to cover a computer programmed to perform the steps of the above-described methods. As used herein, the term non-transitory is a limitation on the medium itself (i.e., tangible, rather than a signal), rather than a limitation on data storage persistence (e.g., RAM versus ROM).

[0242] As used in this application, the term "circuitry" can refer to one or more or all of the following:

[0243] (a) Only hardware circuit implementations (such as implementations in only analog and / or digital circuitry), and

[0244] (b) Combinations of hardware circuits and software, such as (where applicable):

[0245] (i) Combinations of (multiple) analog and / or digital hardware circuits and software / firmware, and

[0246] (ii) Any part of a (multiple) hardware processor (including (multiple)

[0247] digital signal processors), software, and (multiple) memories that work together to enable a device such as a mobile phone or a server to perform various functions), and

[0248] (c) (Multiple) hardware circuits and / or (multiple) processors, such as (multiple) microprocessors or a part of (multiple) microprocessors, which require software (e.g., firmware) to operate, but the software can be absent when not needed for operation.

[0249] This definition of circuitry applies to all uses of the term in this application (including in any claims). As a further example, as used in this application, the term circuitry also covers implementations of only hardware circuits or processors (or multiple processors) or a part of a hardware circuit or processor and their accompanying software and / or firmware. For example, if applicable to a particular claim element, the term circuitry also covers a baseband integrated circuit or a processor integrated circuit for a mobile device, or a similar integrated circuit in a server, a cellular network device, or other computing or network devices.

[0250] Although example embodiments of the present invention have been described with reference to various examples in the preceding paragraphs, it should be understood that the examples given can be modified without departing from the scope of the claimed invention.

[0251] The features described in the foregoing description can be used in combinations other than those explicitly described.

[0252] Although functions have been described with reference to certain features, these functions can be performed by other features, whether or not described.

[0253] Although features have been described with reference to certain embodiments, these features may also be present in other embodiments, whether or not described.

[0254] While efforts have been made in the foregoing specification to draw attention to those features of the invention that are regarded as particularly important, it should be understood that the applicant claims protection for any patentable feature or combination of features mentioned above and / or shown in the accompanying drawings, whether or not specifically emphasized.

Claims

1. A user equipment of a telecommunication network, comprising: at least one processor; and at least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: establish a connection between the user equipment and a first network node of a radio access network, the first network node supporting a first cell, derive a complete configuration of the first cell in the user equipment, receive first incremental configuration information and second incremental configuration information in the user equipment, the first incremental configuration information being related to a cell change from the first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell, in response to the cell change to the second cell, derive a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell, and generate updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: the configuration information available to the user equipment before the cell change to the second cell.

2. Wherein the generation of the updated second incremental configuration information is based on: the complete configuration of the first cell, the first incremental configuration information, and the second incremental configuration information.

3. Wherein the generation of the updated second incremental configuration information is based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

4. Wherein the generation occurs after the cell change from the first cell to the second cell.

5. Wherein the generation occurs between the cell change from the first cell to the second cell and a subsequent cell change.

6. Wherein the generation identifies: the difference between the first incremental configuration information when the first incremental configuration information is applied to the complete configuration of the first cell and the second incremental configuration information when the second incremental configuration information is applied to the complete configuration of the first cell, and merges these differences into the updated second increment configuration.

7. Wherein the generation identifies when an element or parameter in the second incremental configuration information has a value different from a corresponding element or parameter in the first incremental configuration information, and merges the value different from the second incremental configuration information for the element or parameter into the updated second incremental configuration information.

8. Wherein the generation identifies when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and merges the corresponding element or parameter from the complete configuration of the first cell into the updated second incremental configuration information.

9. Generate an indication of when an element or parameter in the first incremental configuration information does not have a corresponding element or parameter in the complete configuration of the first cell, and incorporate an indication that the element or parameter should be removed into the updated second incremental configuration information.

10. The instructions cause the user equipment to at least: In response to a change to another cell, the third cell, derive the complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration to connect to the third cell.

11. The instructions cause the user equipment to at least: In response to the change to the other cell, the third cell, repeat the generation of the updated incremental configuration information.

12. The instructions cause the user equipment to at least: Use RRC signaling to receive the complete configuration of the first cell, the first incremental configuration information, and / or the second incremental configuration information.

13. The first network node includes at least one of the following items, or supports the functions of at least one of the following items: a base station, a 5G gNB, a central unit, a distributed unit, a secondary node, a source node, or a source secondary node.

14. The user equipment supports dual connectivity to a master node and a secondary node.

15. The first cell is at least one of the following: a primary secondary cell, or a primary secondary cell supported by a source secondary node, or a source primary secondary cell, or a current serving cell.

16. The second cell is at least one of the following: a primary secondary cell, or a primary secondary cell supported by a first target secondary node, or a target primary secondary cell, or a target serving cell.

17. The third cell is at least one of the following: a primary secondary cell, or a primary secondary cell supported by a second target secondary node, or a target primary secondary cell, or a target serving cell.

18. The instructions cause the user equipment to at least: Receive information related to a conditional cell PSCell change for moving from the first cell to the second cell, and perform random access to the second cell if the condition for the cell PSCell change to the second cell is satisfied.

19. The instructions cause the user equipment to at least: When random access to the second cell is successful, store the updated second incremental configuration information and delete the second incremental configuration information.

20. The instructions cause the user equipment to at least: Receive information related to a conditional cell PSCell change for moving from the first cell to the third cell, and perform random access to the third cell if the condition for the cell PSCell change to the third cell is satisfied.

21. The user equipment is configured for subsequent selective activation.

22. The user equipment is configured using at least one RRC reconfiguration message.

23. The instructions cause the user equipment to at least: Receive configuration information for performing L1 measurements.

24. The instructions cause the user equipment to at least: Send an L1 measurement report including second cell information to the first cell or the source network node, and receive a trigger to handover to the second cell.

25. Wherein the user equipment is configured for dynamic handover.

26. A user equipment of a telecommunication network, comprising: At least one processor; And At least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: Establish a connection between the user equipment and a first network node of a radio access network, the first network node supporting a first cell, Deduce a complete configuration of the first cell in the user equipment, Receive first incremental configuration information and second incremental configuration information in the user equipment, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell, and Before the cell change to the second cell, also receive updated second incremental configuration information related to the cell change from the second cell to the third cell in the user equipment.

27. Wherein the instructions cause the user equipment to at least: In response to the cell change to the second cell, deduce a complete configuration of the second cell based on the complete configuration of the first cell and the first incremental configuration information to connect to the second cell.

28. Wherein the instructions cause the user equipment to at least: In response to a subsequent cell change to the third cell, deduce a complete configuration of the third cell based on the complete configuration of the second cell and the updated second incremental configuration information to connect to the third cell.

29. Wherein the instructions cause the user equipment to at least: Use RRC signaling to receive the complete configuration of the first cell, the first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information.

30. Wherein the first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information are received within a single RRC message.

31. Wherein the first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information are received within nested RRC messages.

32. Wherein the instructions cause the user equipment to at least: Receive updated second incremental configuration information when connected to the first cell and before determining to perform a cell change.

33. Wherein the instructions cause the user equipment to at least: Also receive fourth incremental configuration information related to the cell change from the second cell to the first cell.

34. Wherein the instructions cause the user equipment to at least: In response to a cell change to the second cell, derive the complete configuration of the second cell based on the complete configuration of the first cell and the first delta configuration information to connect to the second cell, and subsequently, in response to a cell change to the third cell, derive the complete configuration of the third cell based on the complete configuration of the second cell and the updated second delta configuration information to connect to the third cell.

35. Wherein the instructions cause the user equipment to at least: In response to a cell change to a cell, derive the complete configuration of the cell based on the complete configuration of the current serving cell and the corresponding delta configuration information or the corresponding updated delta configuration information for the cell change to connect to the cell.

36. A method for enabling subsequent cell changes for a user equipment that supports connectivity to a radio access network, the method comprising: Establish a connection between the user equipment and a first network node of the radio access network, the first network node supporting a first cell, Derive the complete configuration of the first cell in the user equipment, Receive first delta configuration information and second delta configuration information in the user equipment, the first delta configuration information being related to a cell change from the first cell to a second cell, and the second delta configuration information being related to a cell change from the first cell to a third cell, In response to a cell change to the second cell, derive the complete configuration of the second cell based on the complete configuration of the first cell and the first delta configuration information to connect to the second cell, and Generate updated second delta configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second delta configuration information being based on: the configuration information available to the user equipment prior to the cell change to the second cell.

37. A non-transitory computer-readable medium comprising program instructions stored thereon, the program instructions for at least performing the following: Establish a connection between a user equipment and a first network node of a radio access network, the first network node supporting a first cell, Derive the complete configuration of the first cell in the user equipment, Receive first delta configuration information and second delta configuration information in the user equipment, the first delta configuration information being related to a cell change from the first cell to a second cell, and the second delta configuration information being related to a cell change from the first cell to a third cell, In response to a cell change to the second cell, derive the complete configuration of the second cell based on the complete configuration of the first cell and the first delta configuration information to connect to the second cell, and Generate updated second delta configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second delta configuration information being based on: the configuration information available to the user equipment prior to the cell change to the second cell.

38. A method for implementing subsequent cell change for a user equipment, the user equipment supporting connectivity to a radio access network, the method comprising: Establishing a connection between the user equipment and a first network node of the radio access network, the first network node supporting a first cell, Deriving a complete configuration of the first cell in the user equipment, Receiving, in the user equipment, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell, and Before the cell change to the second cell, further receiving, in the user equipment, updated second incremental configuration information related to the cell change from the second cell to the third cell.

39. A non-transitory computer-readable medium comprising program instructions stored thereon, the program instructions for at least performing the following: Establishing a connection between a user equipment and a first network node of a radio access network, the first network node supporting a first cell, Deriving a complete configuration of the first cell in the user equipment, Receiving, in the user equipment, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from the first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell, and Before the cell change to the second cell, further receiving, in the user equipment, updated second incremental configuration information related to the cell change from the second cell to the third cell.

40. A first network node of a telecommunication network, comprising: At least one processor; And At least one memory storing instructions which, when executed by the at least one processor, cause the user equipment to at least: Receive, in the first network node, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from a first cell to a second cell, the second incremental configuration information being related to a cell change from the first cell to a third cell, and Generate updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: the configuration information available to the first network node before the cell change to the second cell.

41. Wherein the instructions cause the first network node to at least: Generate updated first incremental configuration information for performing a cell change from the third cell to the second cell, the generation of the updated second incremental configuration information being based on: the configuration information available to the first network node before the cell change to the second cell.

42. Wherein the generation of the updated second incremental configuration information, and / or the updated first incremental configuration information is based on: the complete configuration of the first cell, the first incremental configuration information, and the second incremental configuration information.

43. The generation of the updated second incremental configuration information is based on: the complete configuration of the first cell, the complete configuration of the second cell, and the second incremental configuration information.

44. The generation of the updated first incremental configuration information is based on: the complete configuration of the first cell, the complete configuration of the third cell, and the first incremental configuration information.

45. The generation occurs before the cell change from the first cell to the second cell or the third cell.

46. The generation identifies the differences between the first incremental configuration information when the first incremental configuration information is applied to the complete configuration of the first cell and the second incremental configuration information when the second incremental configuration information is applied to the complete configuration of the first cell, and merges these differences into the updated second incremental configuration and / or the updated second incremental configuration information.

47. The generation identifies when an element or parameter in the second incremental configuration information has a value different from the corresponding element or parameter in the first incremental configuration information, and merges the value different from the second incremental configuration information for the element or parameter into the updated second incremental configuration information.

48. The generation identifies when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the second incremental configuration information, and merges the corresponding element or parameter from the complete configuration of the first cell into the updated second incremental configuration information.

49. The generation identifies when an element or parameter in the first incremental configuration information has no corresponding element or parameter in the complete configuration of the first cell, and merges an indication that the element or parameter should be removed into the updated second incremental configuration information.

50. The generation identifies when an element or parameter in the first incremental configuration information has a value different from the corresponding element or parameter in the second incremental configuration information, and merges the value different from the first incremental configuration information for the element or parameter into the updated first incremental configuration information.

51. The generation identifies when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the first incremental configuration information, and merges the corresponding element or parameter from the complete configuration of the second cell into the updated first incremental configuration information.

52. The generation identifies when an element or parameter in the second incremental configuration information has no corresponding element or parameter in the complete configuration of the second cell, and merges an indication that the element or parameter should be removed into the updated first incremental configuration information.

53. The first incremental configuration information and / or the first incremental configuration information is received using an SN add request confirmation or a handover request confirmation message.

54. The first network node includes at least one of the following items, or supports the functions of at least one of the following items: a base station, a 5G gNB, a centralized unit, a distributed unit, a secondary node, a source node, or a source secondary node.

55. The user equipment supports dual connectivity to the master node and the secondary node.

56. The first cell is at least one of the following items: a primary-secondary cell, or a primary-secondary cell supported by the source secondary node, or a source primary-secondary cell, or a current serving cell.

57. The second cell is at least one of the following items: a primary-secondary cell, or a primary-secondary cell supported by the first target secondary node, or a target primary-secondary cell, or a target serving cell.

58. The third cell is at least one of the following items: a primary-secondary cell, or a primary-secondary cell supported by the second target secondary node, or a target primary-secondary cell, or a target serving cell.

59. The instruction causes the user equipment to at least: Use RRC signaling to send the complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information.

60. The complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information are received within a single RRC message.

61. The complete configuration of the first cell, the first incremental configuration information, the updated first incremental configuration information, the second incremental configuration information, and / or the updated second incremental configuration information are received within nested RRC messages.

62. A method for implementing cell change for a user equipment that supports connectivity to a radio access network, the method comprising: Receiving, in a first network node, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from a first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell, and Generating updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: the configuration information available to the first network node prior to the cell change to the second cell.

63. A non-transitory computer-readable medium, including program instructions stored thereon, the program instructions for at least performing the following: Receiving, in a first network node, first incremental configuration information and second incremental configuration information, the first incremental configuration information being related to a cell change from a first cell to a second cell, and the second incremental configuration information being related to a cell change from the first cell to a third cell, and Generate updated second incremental configuration information for performing a cell change from the second cell to the third cell, the generation of the updated second incremental configuration information being based on: the configuration information available to the first network node prior to the cell change to the second cell.

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