User equipment or source master node in a wireless communication network, network node and method

Abstract

A method is provided for indicating a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network. The method is performed by a user equipment (UE) or a source master node (MN). The UE is configured with a current SCG. A CHO configuration for the UE is obtained from a source MN (1201). The CHO configuration includes a configuration for a target candidate node. The target candidate node includes any one or more of a target candidate MN and a target candidate secondary next node (SN). When a CHO execution condition related to the CHO configuration is satisfied, an indication is sent to the target candidate node (1204). The indication indicates the SCG status to be set to one of SCG active or SCG inactive.

Description

[Technical field]

[0001] Embodiments herein relate to a user equipment (UE) or source master node (MN), a first network node, a second network node, a third network node, and methods therein, which in some aspects relate to indicating and / or handling a secondary cell group (SCG) status during a conditional handover (CHO) of a UE in a wireless communication network.

[0002] The embodiments herein further relate to a computer program and a carrier, a UE, and a network node corresponding to the above method. [Background technology]

[0003] In a typical wireless communication network, wireless devices, also known as wireless communication devices, mobile stations, stations (STAs) and / or user equipment (UE), communicate over a local area network, such as a WiFi network or a cellular network that includes a Radio Access Network (RAN) part and a Core Network (CN) part, and a wide area network (WAN). The RAN covers a geographical area that is divided into service areas or cell areas, which may also be referred to as beams or beam groups, and each service area or cell area is, for example, connected to a Wi-Fi access point or a radio base station (RBS). Wireless access nodes, etc. The service is provided by a wireless network node. base station In some networks, it is also referred to as, for example, Node B, eNode B (eNB) or gNB in ​​fifth generation (5G) communications. profit A service area or cell area is a geographical area where radio coverage is provided by a radio network node. The radio network node communicates with wireless devices within range of the radio network node over the air interface operating at radio frequencies.

[0004] 3GPP (registered trademark) is a technology partnership that develops 3G, 4G, 5G, and future developments. Includes It is a standards body that specifies standards for cellular system evolution. The specifications for Evolved Packet Systems (EPS), also known as Fourth Generation (4G) networks, were finalized within the 3rd Generation Partnership Project (3GPP®). As networks continue to evolve, new releases of 3GPP® are specifying 5G networks, also known as 5G New Radio (NR).

[0005] The 5G NR spectrum is split into two distinct frequency ranges: Frequency Range 1 (FR1) and Frequency Range 2 (FR2). FR1 includes sub-6 GHz frequency bands. Some of these bands are bands that have been used by previous standards, but they have been expanded to cover potential new spectrum from 410 MHz to 7125 MHz, while FR2 includes frequency bands from 24.25 GHz to 52.6 GHz. Bands in this mmWave range will have a shorter communication range than the FR1 bands, but will have a wider available bandwidth.

[0006] Multi-antenna technology can greatly increase the data rate and reliability of wireless communication systems. For a wireless connection between a single user, such as a UE, and a base station, performance is particularly improved if both the transmitter and receiver are equipped with multiple antennas, resulting in a multiple-input multiple-output (MIMO) communication channel. This may be referred to as single-user (SU)-MIMO. In scenarios where MIMO technology is used for wireless connections between multiple users and base stations, MIMO allows users to communicate with the base station simultaneously using the same time-frequency resources by spatially separating the users, further increasing cell capacity. This may be referred to as multi-user (MU)-MIMO. MU-MIMO is advantageous when each UE has only one antenna. Get it Such systems and / or related techniques are commonly referred to as MIMO.

[0007] 3GPP(registered trademark) dual connection In 3GPP® Release 12, the LTE feature Dual Connectivity (DC) was introduced, allowing a UE to connect to two cell groups, each controlled by an eNB, an LTE access node called the Master eNB (MeNB) and Secondary eNB (SeNB). The UE still has only one Radio Resource Control (RRC) connection with the network. In 3GPP®, the Dual Connectivity (DC) solution has since evolved and is now specified for NR and between LTE and NR as well. Multi-Connectivity (MC) is when more than two nodes are involved. With the introduction of 5G, the term Multi-Radio Dual Connectivity (MR-DC) (see also 3GPP® TS 37.340) was defined as a generic term for all dual connectivity options that include at least one NR access node. Using the generalized terminology of MR-DC, the UE is connected to a Master Cell Group (MCG) controlled by a Master Node (MN) and a Secondary Cell Group (SCG) controlled by a Secondary Node (SN).

[0008] Furthermore, in MR-DC, when dual connectivity is configured in a UE, carrier aggregation can be used in each of the two cell groups, MCG and SCG, as well. In this case, in a master cell group (MCG) controlled by a master node (MN), the UE can use one primary cell (Pcell) and one or more secondary cells (SCells). And in a secondary cell group (SCG) controlled by a secondary node (SN), the UE can use one primary SCell (PSCell) (also known as a primary SCG cell in NR) and one or more SCells. This combination case is shown in Figure 1, which shows dual connectivity combined with carrier aggregation in MR-DC. In NR, the primary cell of the master cell group or secondary cell group is also called a special cell (SpCell). Thus, the SpCell in the MCG is a PCell, and the SpCell in the SCG is a PSCell.

[0009] There are different ways to deploy 5G networks, with or without interworking with LTE, also known as Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC). In principle, NR and LTE can be deployed without interworking, also known as option 2, called NR Standalone (SA) operation, i.e. NR gNBs are connected to the 5G Core Network (5GC). profit LTE eNB is connected to EPC. profit , there is no interconnection between the two, also known as Option 1.

[0010] On the other hand, the first supported version of NR uses dual connectivity, also known as option 3, called E-UTRAN-NR dual connectivity (EN-DC), as shown in Figure 2. In such a deployment, dual connectivity between NR and LTE is applied, where the UE is connected to an LTE access node on the LTE radio interface (LTE Uu in the figure) and to an NR access node on the NR radio interface (NR Uu in the figure). Furthermore, in EN-DC, the LTE access node acts as a master node, in this case known as a master eNB (MeNB) controlling the MCG, and the NR access node acts as a secondary node, in this case known as a secondary gNB (SgNB) controlling the Secondary Cell Group (SCG). The SgNB, in this case NR, may not have a control plane connection to the core network (EPC) and may instead be connected to the MeNB To This is also called "Non-Standalone NR" or "NSA NR" for short. In this case, the functionality of the NR cell is limited and it is used as a booster and / or diversity leg for connected mode UEs. It would be However, please note that UEs in RRC_IDLE cannot camp on these NR cells.

[0011] With the introduction of 5GC, other options may become available. As mentioned above, option 2 supports standalone NR deployments where a gNB is connected to 5GC. Similarly, LTE can also be connected to 5GC using option 5, also known as eLTE, E-UTRA / 5GC, or LTE / 5GC, where the node is also known as ng-eNB. profit In these cases, both NR and LTE are considered to be part of the NG-RAN, and both ng-eNB and gNB may be referred to as NG-RAN nodes.

[0012] Of particular note is: There are also other variations of dual connectivity between LTE and NR that are standardized as part of NG-RAN connected to 5GC. These fall under the umbrella of MR-DC: EN-DC (option 3): LTE is the master node and NR is the secondary node (EPC CN is used as shown in Figure 2). NE-DC (option 4): NR is the master node and LTE is the secondary node (5GCN is used) NGEN-DC (option 7): LTE is the master node and NR is the secondary node (5GCN is used) NR-DC (variant of option 2): As shown in Figure 3, both the Master Node (MN) controlling the MCG and the Secondary Node (SN) controlling the SCG are NR and dual connectivity using 5GCN.

[0013] The transition between these options may vary from operator to operator, so it is possible to deploy several options in parallel in the same network. For example, there may be NR base stations supporting options 2 and 4 in the same network as eNB base stations supporting options 3, 5 and 7. In combination with the dual connectivity solution between LTE and NR, it is also possible to support carrier aggregation (CA) in each cell group, i.e. MCG and SCG, and dual connectivity between nodes of the same RAT, e.g. NR-NR DC. In the case of LTE cells, these different arrangements result in the coexistence of LTE cells associated with eNBs connected to EPC, 5GC or both EPC / 5GC.

[0014] As mentioned above, DC is standardized in both LTE and E-UTRA-NR DC (EN-DC).

[0015] LTE DC and EN-DC differ in terms of which node controls what. Essentially there are two options: 1. Centralized solutions (LTE-DC, etc.) 2. Decentralized solutions (EN-DC, etc.)

[0016] Figure 4 shows a schematic of the control plane architecture for LTE DC, EN-DC and NR-DC. The main difference here is that in EN-DC and NR-DC the SN has a separate NR RRC entity. This means that the SN can also control the UE, sometimes without the MN knowing, but often the SN needs to coordinate with the MN. In LTE-DC the RRC decisions are always taken from the MN (MN to UE). However, note that the SN still decides the configuration of the SN, since only the SN itself knows what kind of resources, capabilities etc. it has.

[0017] For EN-DC and NR-DC, the main changes compared to LTE DC are as follows: Introduction of split bearer from SN (called SCG split bearer) · Introduction of split bearer in RRC Introduction of direct RRC from SN (also known as SCG SRB)

[0018] Figure 5 shows the user plane protocol architecture of MR-DC (EN-DC) with EPC from the network perspective, where the network can configure E-UTRA Packet Data Convergence Protocol (PDCP) or NR PDCP for MN terminated MCG bearers, but NR PDCP is always used for all other bearers.

[0019] Figure 6 shows the user plane protocol architecture of MR-DC with 5GC (NGEN-DC, NE-DC and NR-DC) from the network perspective. In MR-DC with 5GC, NR PDCP is always used for all bearer types. In NGEN-DC, E-UTRA Radio Link Control (RLC) / Medium Access Control (MAC) is used in MN and NR RLC / MAC is used in SN. In NE-DC, NR RLC / MAC is used in MN and E-UTRA RLC / MAC is used in SN. In NR-DC, NR RLC / MAC is used in both MN and SN. SDAP stands for Service Data Adaptation Protocol.

[0020] Conditional Handover In 3GPP Release 16, conditional handover was standardized as a solution to increase robustness during handover (HO). To avoid undesired dependency on the serving radio link on the time (and radio conditions) when the UE should perform the handover, the possibility to provide the UE with RRC signaling for handover earlier was standardized. For example, the HO command can be associated with a condition based on radio conditions similar to those related to the A3 event where a particular neighboring node becomes X dB better than the target. As soon as the condition is met, the UE performs the handover according to the provided handover command.

[0021] Such a condition may be, for example, that the quality of the target cell or beam is X dB stronger than the serving cell. The threshold Y used in the preceding measurement report event is selected to be lower than the threshold of the handover execution condition. Should This allows the serving cell to prepare the handover upon receipt of the early measurement report and provide an RRCConnectionReconfiguration including mobilityControlInfo when the radio link between the source cell and the UE is still stable. The handover execution is performed at a later time (and threshold) that is considered optimal for the handover execution.

[0022] Figure 7 shows an example with a single serving cell and a target cell. R R M measurement There may be many cells or beams that the UE has reported as possible candidates based on the selected cell or beam configuration. The network should then have the freedom to issue conditional handover commands for some of these candidates. The RRCConnectionReconfiguration for each of these candidates may differ, for example, in terms of the HO execution conditions (RS to measure, thresholds to be exceeded) and the Random Access (RA) preamble to be sent when the conditions are met.

[0023] While the UE evaluates the conditions, it continues to operate according to the current RRC configuration, i.e. without applying the conditional HO command. If the UE determines that the conditions are met, it disconnects from the serving cell, applies the conditional HO command, and connects to the target cell. These steps correspond to performing a conventional handover.

[0024] Conditional PSCell Change (CPC) 3GPP Release 16 A solution for the CPC procedure was also standardized in Release 16, where a UE operating in Multi-Radio Dual Connectivity (MR-DC) receives one or more RRC reconfigurations (e.g. RRCReconfiguration messages) containing an SCG configuration, e.g. secondaryCellGroup in the information element (IE) CellGroupConfig, in a conditional reconfiguration, along with a stored reconfigurationWithSync associated to an execution condition (such as an A3 / A5 event configuration), so that one of the stored messages is e.g. a message indicating that the UE should perform a PSCell change. It would be Accordingly, it is applied only if the execution condition associated with the serving PSCell is met (if a better neighboring cell is found than the current SpCell of the SCG).

[0025] Inter-SN CPC in 3GPP Release 17 Inter-SN CPC solutions are being discussed in 3GPP Release 17. One of the solutions, also referred to as Solution 1, has the signaling flow shown in FIG. Summary of the Invention [Problem to be solved by the invention]

[0026] Problems initially identified by the inventors as part of the development of embodiments of the present invention are described.

[0027] In legacy handover of 3GPP Release 15 mobility, the UE receives a reconfiguration and applies it to access the target cell. Thus, the target candidate that prepared the configuration decides to deactivate the SCG state / operation mode due to current traffic demands. It would be If so, it remains unchanged when the UE applies the generated message. It would be As used herein, an SCG state may include, for example, SCG active or SCG inactive. An SCG state may also be referred to as an SCG operation mode. However, in a conditional handover, the time at which a target candidate generates a configuration and determines an SCG state may be significantly different from the time at which the UE applies the target configuration, so The traffic situation may have changed when the UE applies a possibly deactivated SCG, resulting in The target candidate activates the SCG immediately after execution. In conclusion, since the SCG state update of an ongoing connection should be more dynamic than the decision to perform a handover, a solution that updates the UE configuration every time the SCG state changes may result in a large amount of signaling between the UE and the network, and within the network, i.e., between the source MN and the target candidate MN, and between the target candidate MN and the target candidate SN, and may also result in race conditions due to different delays.

[0028] For example, assume that a UE configured with MR-DC is configured with CHO and at least one applied target candidate configuration, e.g., RRC reconfiguration, includes MR-DC configuration. When CHO is configured, the SCG state is deactivated and the target candidate follows that state when generating the SCG configuration that is stored in the UE and applied at run time. Once the UE starts monitoring run conditions, due to increased traffic demand, the MN and / or S-SN may decide to activate the SCG. Thus, in an implementation using protocol solutions currently envisaged from previous 3GPP agreements in this field, two outcomes may occur: A) The UE applies the target SCG configuration in a suboptimal state, e.g. it is deactivated when it should be activated and another signaling procedure occurs immediately after CHO execution. This is shown in Figure 9. -B) To prevent A), while the UE is configured with a CHO including an MR-DC configuration, when the MN and / or S-SN triggers a change in the SCG state, e.g., from inactive to active, it triggers a change procedure for each target candidate SN, so that each target candidate SN may update the SCG reconfiguration that is applied at run time when the execution condition is met. Then, after obtaining the updated SCG reconfiguration, it provides it to the UE. Thus, this reduces the time required for the connection between the source MN and the target candidate MN. and ,between the target candidate MN and the SN candidate Xn interface , and between the network and the UE Both On the other hand, the number of CHO procedures increases by a factor of N, where N is the number of times the SCG state was changed while the UE was configured with CHO. Furthermore, these procedures can take time, which increases the risk of a race condition, i.e., the execution of CHO while the network is acquiring a new SCG reconfiguration in the new state. It would be This is shown in Figure 10.

[0029] An objective of the embodiments herein is to improve the performance of wireless communication networks, for example those using CHO with multi-radio dual connectivity. [Means for solving the problem]

[0030] According to one aspect, the object is achieved by a method for indicating a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network. The method is executed by a user equipment (UE) or a source MN. The UE is configured with a current SCG. A CHO configuration for the UE is obtained from the source MN. The CHO configuration includes a configuration of a target candidate node. The target candidate node includes any one or more of a target candidate master node (MN) and a target candidate secondary node (SN). When a CHO execution condition related to the CHO configuration is satisfied, an indication is sent to the target candidate node. The indication indicates an SCG state that is set to one of SCG active or SCG inactive.

[0031] According to another aspect, the object is achieved by a method performed by a first network node acting as a source master node (MN). The method is for handling a secondary cell group (SCG) state during a conditional handover (CHO) of a user equipment (UE) in a wireless communication network. The UE is configured with a current SCG. A conditional handover (CHO) configuration for the UE is transmitted to the UE. The CHO configuration includes a configuration for a target candidate node. The target candidate node includes any one or more of a target candidate MN and a target candidate secondary node (SN). The CHO configuration triggers the UE to send an indication to the target candidate node when a CHO execution condition related to the CHO configuration is met. The indication indicates an SCG state being set to one of SCG active or SCG inactive.

[0032] According to another aspect, the object is achieved by a method performed by a second network node acting as a target master node (MN). The method is for handling a secondary cell group (SCG) state during a conditional handover (CHO) of a user equipment (UE) in a wireless communication network. The UE is configured with a current SCG. When a CHO execution condition related to the CHO configuration is satisfied, an indication is received from the UE. The indication indicates the SCG state to be set to one of either SCG active or SCG inactive.

[0033] According to another aspect, the object is achieved by a method performed by a third network node acting as a target secondary node (SN). The method is for handling a secondary cell group (SCG) state during a conditional handover (CHO) of a user equipment (UE) in a wireless communication network. The UE is configured with a current SCG. When a CHO execution condition related to the CHO configuration is satisfied, an indication is received from the UE. The indication indicates the SCG state to be set to one of either SCG active or SCG inactive.

[0034] According to another aspect, the object is achieved by one of a user equipment (UE) or a source master node (MN) configured to indicate a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network, the UE or source MN being configured with a current SCG, the UE or source MN being further configured as follows: - Obtain a conditional handover (CHO) configuration for the UE from a source MN, where the CHO configuration is adapted to include configurations of target candidate nodes, which are configured to include any one or more of target candidate MNs and target candidate secondary nodes (SNs). An indication adapted to indicate an SCG state that is set to one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is met. of Send to the target candidate node.

[0035] According to another aspect, the object is achieved in a wireless communication network by a first network node acting as a source master node (MN) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE), the UE being configured to be configured with a current SCG, the first network node being further configured to: Send a UE conditional handover (CHO) configuration to the UE, the CHO configuration being adapted to include configurations of target candidate nodes, the target candidate nodes being configured to include any one or more of a target candidate master node (MN) and a target candidate secondary node (SN). - The CHO configuration is executed when the CHO execution conditions related to the CHO configuration are met. It is adapted to The indication is adapted to trigger the UE to send an indication to the target candidate node when the SCG status is set to one of SCG active or SCG inactive.

[0036] According to another aspect, the object is achieved by a second network node in a wireless communication network operating as a target master node (MN) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) of a user equipment (UE), the UE being configured to be configured with a current SCG, the second network node being further configured to: - receiving an indication from the UE when a CHO execution condition related to the CHO configuration is adapted to be satisfied, the indication being adapted to indicate an SCG state being set to one of SCG active or SCG inactive.

[0037] According to another aspect, the object is achieved in a wireless communication network by a third network node acting as a target secondary node (SN) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) of a user equipment (UE). The UE is configured to be configured in a current SCG and a second SCG is configured to be configured in the third network node. 3 The network node is further configured as follows: - receiving an indication from the UE when a CHO execution condition related to the CHO configuration is adapted to be satisfied, the indication being adapted to indicate an SCG state being set to one of SCG active or SCG inactive.

[0038] Some advantages of the embodiments herein include, for example:

[0039] The embodiments herein allow the target MN 112 to inform the T-SN about the current SCG state at the time of execution of CHO. By sending this information at the time of execution, for example, the CHO configuration stored in the UE 120 does not need to be updated every time the SCG state changes. This can prevent a lot of signaling in the network between the source MN 111 and the target candidate MN 112, and between the target candidate MN 112 and the candidate T-SN 113, and a lot of signaling towards the UE 120. [Brief description of the drawings]

[0040] [Figure 1] FIG. 1 is a block diagram showing an example of a background art. [Diagram 2] FIG. 1 is a block diagram showing an example of a background art. [Diagram 3] FIG. 1 is a block diagram showing an example of a background art. [Figure 4] FIG. 1 is a block diagram showing an example of a background art. [Diagram 5] FIG. 1 is a block diagram showing an example of a background art. [Figure 6] FIG. 1 is a block diagram showing an example of a background art. [Figure 7] FIG. 1 is a signaling diagram showing an example of the background art. [Figure 8] FIG. 1 is a signaling diagram showing an example of the background art. [Figure 9] FIG. 1 is a signaling diagram showing an example of the background art. [Figure 10] FIG. 1 is a signaling diagram showing an example of the background art. [Figure 11] 1 is a block diagram illustrating an embodiment of a wireless communication network. [Figure 12] 4 is a flow chart of an embodiment of a method in a UE or a source MN. [Figure 13] 4 is a flow chart of an embodiment of a method in a first network node. [Figure 14] 4 is a flow chart of an embodiment of a method in a second network node. [Figure 15] 4 is a flow chart of an embodiment of a method in a third network node. [Figure 16] FIG. 1 is a signaling diagram illustrating an exemplary embodiment. [Figure 17a] 1 is a block diagram illustrating an embodiment of a UE or a source MN. [Figure 17b] 1 is a block diagram illustrating an embodiment of a UE or a source MN. [Figure 18a] FIG. 2 is a block diagram illustrating an embodiment of a first network node. [Figure 18b] FIG. 2 is a block diagram illustrating an embodiment of a first network node. [Figure 19a] FIG. 2 is a block diagram illustrating an embodiment of a second network node. [Figure 19b] FIG. 2 is a block diagram illustrating an embodiment of a second network node. [Figure 20a] FIG. 13 is a block diagram illustrating an embodiment of a third network node. [Figure 20b] FIG. 13 is a block diagram illustrating an embodiment of a third network node. [Figure 21] FIG. 1 illustrates a communications network connected to a host computer via an intermediate network. [Figure 22] 1 is a generalized block diagram of a host computer communicating with user devices over a partially wireless connection via a base station. [Figure 23] 4 is a flow chart illustrating a method performed in a communications system including a host computer, a base station, and user equipment. [Figure 24] 4 is a flow chart illustrating a method performed in a communications system including a host computer, a base station, and user equipment. [Diagram 25] 4 is a flow chart illustrating a method performed in a communications system including a host computer, a base station, and user equipment. [Figure 26] 4 is a flow chart illustrating a method performed in a communications system including a host computer, a base station, and user equipment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] 11 shows an overview of a wireless communication network 100 in which an embodiment may be implemented. The wireless communication network 100 includes one or more RANs and one or more CNs. The wireless communication network 100 may include 5G NR , but may also use a number of other different technologies, such as WiFi, LTE, LTE Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile Communications / Enhanced Data Rates for GSM Evolution (GSM / EDGE), or Ultra Mobile Broadband (UMB), to mention a few possible implementations.

[0042] Network nodes such as the first network node 111, the second network node 112 and the third network node 113 operate in the wireless communication network 100 with antenna beams, referred to herein as beams. Each of the first, second and third network nodes 111, 112, 113 may, for example, provide several cells, which may be used to communicate with, for example, the UE 120. Each of the first, second and third network nodes 111, 112, 113 may be a transmitting point and a receiving point, a radio access network node, for example a base station, for example a Node B, evolved Node B (eNB, eNodeB, eNodeB), NR NodeB (gNB), base transceiver station, wireless remote unit, access point base station, base station router, a transmitting arrangement of a wireless base station, a standalone access point, a wireless local area network (WLAN) access point, an access point station (AP The network nodes 111, 112 may be radio base stations, such as STAs, access controllers, UEs acting as access points or peers in device-to-device (D2D) communication, or other network units capable of communicating with UEs served by the first and second network nodes 111, 112, respectively, depending for example on the radio access technology and terminology used.

[0043] The first network node 111 may act as a source MN, the second network node 112 may act as a target MN 112, and the third network node 113 may act as a target SN.

[0044] A UE, such as the UE 120, operates within the wireless communication network 100. The UE 120 may be configured with MR-DC, for example to communicate with an MCG controlled by an MN and an SCG controlled by an SN, for example, first and second network nodes 111, 112. The UE 120 may be, for example, an NR device, a mobile station, a wireless terminal, an NB-IoT device, an eMTC device, an NR RedCap device, a CAT-M device, a Wi-Fi device, an LTE device, and a non-access point (non-AP) STA, for example, a base station, such as the network node 110, an STA that communicates with one or more access networks (ANs), such as a RAN, via one or more core networks (CNs). The UE may be, for example, a smartphone, a laptop, a mobile phone, a sensor, a repeater, a mobile tablet, or a small base station communicating within a cell. Terminal, It is a non-limiting term meaning any UE such as a wireless communication terminal, user equipment, D2D terminal or node. It should be understood by those skilled in the art that .

[0045] The methods herein may in some aspects be performed by the first network node 111, the second network node 112, and the third network node 113. Alternatively, a distributed node (DN) and functionality included in, for example, the cloud 140 shown in Figure 10 may be used to perform the methods or to perform parts of the methods.

[0046] Some example embodiments provide a method for a UE 120 to indicate an SCG state during execution of a CHO to a target candidate, the target candidate including an SCG configuration. In some embodiments, the method includes the UE 120 indicating a current SCG state to a selected target candidate MN 112 and / or a target candidate SN 113 during CHO execution, e.g., when the UE 120 is configured with MR-DC and monitors CHO execution conditions. On the network side, the target candidate MN 112 triggers an MN-initiated SCG deactivation / activation based on the indication. obtain , Or,Target candidate SN 113 may trigger SN-initiated SCG deactivation / activation.

[0047] Some examples of the method include the UE 120 always setting the SCG state of the target candidate of the SCG to inactive, and the logic is to have the target candidate MN 112 and / or the target candidate SN 113 react and activate the SCG after the CHO is performed, depending on the traffic evaluation after the CHO is performed. Wax .

[0048] Some examples of the method include the UE 120 setting the SCG status of the target candidate of the SCG to always active, and the logic reacting to the target candidate MN 112 and / or the target candidate SN 113 depending on the traffic evaluation after the CHO, and possibly setting the SCG after the CHO. Non By activating Wax One advantage here is that it still works if the target candidate does not support deactivated SCG.

[0049] Some examples of the method include the UE 120 setting the SCG status of the target candidate of the SCG to a value preconfigured by the MN, e.g., active or inactive. The logic reacts to the target candidate MN 112 and / or the target candidate SN 113 depending on the traffic evaluation after the CHO, and possibly sets the SCG to active or inactive after the CHO. Non By activating Wax One advantage here is that it still works if the target candidate does not support deactivated SCG.

[0050] Some examples of the method include UE 120 setting the SCG state of the target candidate SCG to the most recent SCG state that UE 120 had when the CHO was performed.

[0051] Some examples of the method include the target candidate MN 112 informing the target candidate SN 113 about the current SCG state of the UE 120 at the time of performing CHO, and / or the UE 120 determining the target candidate SCG state based on the current SCG state at the time of performing CHO.

[0052] FIG. 12 illustrates an exemplary method executed by the UE 120, or for example the source MN 111. The UE 120 may also be referred to as a wireless device or wireless terminal. The method is for indicating an SCG status during a CHO in a wireless communication network 100. The purpose is to enable the UE 120 to determine which SCG should be considered as the SCG configuration to be applied when performing the CHO, the target candidate configuration for the CHO including the MR-DC configuration including the SCG configuration. Thanks to that, when performing the CHO, there is no need to update the CHO configuration, e.g. stored in the UE 120, every time the SCG status changes in the source MN while the UE 120 is still monitoring the CHO status. This prevents a lot of signaling to the UE 120. profit , the energy consumption of the UE 120 will be reduced.

[0053] The UE 120 is configured with a current SCG, e.g., the UE 120 is configured with an MR-DC. A current SCG as used herein means an SCG that is configured, e.g., when the UE 120 is configured with an MR-DC, i.e., it is the SCG that is currently being used. The UE 120 is configured, e.g., with an MR-DC, and is transmitting and / or receiving data between the MCG, the MN, the SCG, and the SN unless the current SCG is deactivated. The method may include any one or more of the following actions. The following actions may be performed in any suitable order.

[0054] Action 1201 The UE 120 obtains its CHO configuration from the source MN 111. The CHO configuration includes the configurations of the target candidate nodes 112, 113. Note that although the UE 120 obtains the configuration of the target candidate node 112, the UE 120 may not know which node the configuration belongs to.

[0055] The CHO configuration may include, for example, a target configuration of the UE 120, which may include, for example, both an MCG configuration and an SCG configuration. The configuration of the MN node may be an MCG configuration that the UE 120 recognizes, and the configuration of the SN node may be an SCG configuration.

[0056] The target candidate nodes 112, 113 may include any one or more of the target candidate MN 112 and the target candidate SN 113. This means that the target candidate nodes 112, 113 may be, for example, the target candidate MN 112 or the target candidate SN 113.

[0057] Action 1202 In some embodiments, the UE 120 obtains, e.g., receives, a current SCG state. The current SCG state may be set to SCG active or SCG inactive. The current SCG state may be the SCG state that the UE 120 has when the CHO execution is initiated. The CHO execution may be performed for a source SN. Note that the source SN may be the same node as the target SN, e.g., since the same PSCell and / or SCG are maintained in the CHO.

[0058] It should be noted that the terms "SCG activated" and "SCG deactivated" as used in this specification are also referred to as "SCG active" and "SCG inactive" since it refers to a state and not an action.

[0059] Action 1203 In some embodiments, UE 120 obtains the target SCG state, for example by setting it to one of the following: - Always inactive - Always active For example, a value preconfigured by the source MN 111 as active or inactive The latest SCG state that the UE 120 has when the CHO is executed, e.g., the current SCG state

[0060] Action 1204 The UE 120 sends an indication to the target candidate node 112, 113. The indication is sent when a CHO execution condition related to the CHO configuration is met. The indication indicates the SCG state to be set to one of either SCG active or SCG inactive.

[0061] The indicated SCG state may be set according to any one of the current SCG state and / or the target SCG state.

[0062] The indication may be initiated by a selected target candidate node 112, 113, including, for example, any one or more of the target candidate MN 112 and / or the target candidate SN 113, and may indicate a target SCG status of SCG active or SCG inactive.

[0063] As an example, this may mean setting the SCG state for the target SN 113 as part of applying the CHO configuration with the SCG, and the UE 120 and target network nodes 112, 113 acting accordingly.

[0064] In some embodiments, sending the indication may include the UE 120 performing a random access towards the target candidate node 112, 113 to indicate that the SCG is activated.

[0065] 13 illustrates an exemplary method performed by a first network node 111 acting as a source MN 111. The method includes: For UE120 For handling SCG conditions during CHO. UE 120 is made up of the current SCG.

[0066] The method may include any one or more of the following actions, which may be performed in any suitable order.

[0067] Action 1301 The first network node 111 transmits a CHO configuration for the UE 120 to the UE 120. The CHO configuration includes configurations of target candidate nodes 112, 113. The target candidate nodes 112, 113 may include any one or more of the target candidate MN 112 and the target candidate SN 113.

[0068] The CHO configuration triggers the UE 120 to send an indication to the target candidate node 112, 113 when a CHO execution condition related to the CHO configuration is met. The indication indicates the SCG state to be set to one of either SCG active or SCG inactive. The SCG state may include any one of the current SCG state and / or the target SCG state.

[0069] Action 1302 In some embodiments, the first network node 111 transmits the current SCG state to the UE 120. The current SCG state may be set to SCG active or SCG inactive.

[0070] In these embodiments, the indication to the target candidate node 112, 113 may indicate the current SCG state. In these embodiments, the indication, for example in action 1301, may set the target SCG state to SCG active or SCG inactive, initiated by the selected target candidate node 112, 113. The target candidate nodes 112, 113 may include, for example, any one or more of the target candidate MN 112 and the target candidate SN 113.

[0071] Action 1303 In some embodiments, the first network node 111 may configure the UE 120 with a target SCG state set to any one of the following: - Always inactive - Always active -preconfigured values ​​as active or inactive, The latest SCG state that the UE 120 has when the CHO is executed

[0072] For example, in these embodiments, the indication may indicate a target SCG state, as described above in actions 1301-1302, which may mean that the MN 111 configures the UE 120 to transmit the current SCG state as the target SCG state.

[0073] 14 illustrates an exemplary method performed by a second network node 112 acting as a target MN 112. The method includes: For UE120 For handling SCG conditions during CHO. UE 120 is made up of the current SCG.

[0074] The method may include any one or more of the following actions, which may be performed in any suitable order.

[0075] Action 1401 The second network node 112 receives an indication from the UE 120 when a CHO execution condition for the CHO configuration is satisfied. The indication may indicate an SCG state that is set to one of SCG active or SCG inactive. obtain .

[0076] The SCG state may include any one of the current SCG state and / or the target SCG state.

[0077] In some embodiments, if the indication indicates a current SCG state, the second network node 112 sets the target SCG state to SCG active or SCG inactive based on the indication.

[0078] In some embodiments, for example, if the indication indicates a target SCG state including inactive, such as the target SCG state being set to SCG inactive, the second network node 112 reacts by activating the SCG after performing the CHO, for example, possibly depending on traffic evaluation after performing the CHO.

[0079] In some embodiments, for example, if the indication indicates a target SCG state including active, such as the target SCG state being set to SCG active, the second network node 112 reacts by deactivating the SCG after performing the CHO, for example, possibly depending on traffic evaluation after performing the CHO.

[0080] In some embodiments, for example, if the indication indicates a target SCG state that includes a preconfigured value as active or inactive, such as the target SCG state being set to a preconfigured value such as active or inactive, the second network node 112 may react by, for example, updating the SCG after performing the CHO, possibly depending on the traffic evaluation after performing the CHO. Possibly deactivation or e.g. Activate.

[0081] 15 illustrates an exemplary method performed by a third network node 113 acting as a target SN 113. The method is for handling SCG status during a CHO for a UE 120 in a wireless communication network 100. The UE 120 is configured with a current SCG. The method may include any one or more of the following actions. The following actions may be performed in any suitable order.

[0082] Action 1504 The third network node 113 receives an indication from the UE 120, for example, when a CHO execution condition related to the CHO configuration is satisfied. The indication may indicate an SCG state set to one of SCG active or SCG inactive. obtain The SCG state may include any one of the current SCG state and / or the target SCG state.

[0083] In some embodiments, if the indication indicates a current SCG state, the third network node 113 sets the target SCG state to SCG active or SCG inactive based on the indication.

[0084] In some embodiments, for example, if the indication indicates a target SCG state including inactive, such as the target SCG state being set to SCG inactive, the third network node 113 reacts by activating the SCG after performing the CHO, for example possibly depending on traffic evaluation after performing the CHO.

[0085] In some embodiments, for example, if the indication indicates a target SCG state including active, such as the target SCG state being set to SCG active, the third network node 113 reacts by deactivating the SCG after performing the CHO, for example, possibly depending on traffic evaluation after performing the CHO.

[0086] In some embodiments, for example, if the indication indicates a target SCG state that includes a preconfigured value as active or inactive, such as the target SCG state being set to a preconfigured value such as active or inactive, the third network node 113 may react by, for example, reconfiguring the SCG after performing the CHO, possibly depending on the traffic evaluation after performing the CHO. Possibly deactivation or e.g. Activate.

[0087] The embodiments herein refer to a first network node 111 acting as a MN, e.g., a UE 120 and / or a source MN having an MCG configured for a MN terminated bearer, the MN being connected to a gNodeB or a central unit gNodeB (CU-gNB), It may be an eNodeB or a central unit eNodeB (CU-eNB), or any network node and / or network function. It is noted that the terms "first network node 111", "source MN 111" and "source MN" may be used interchangeably herein.

[0088] The embodiments herein refer to a second network node 112 acting as a MN, e.g., a UE 120 and / or a target MN having an MCG configured for the MN terminated bearer, which may be a gNodeB, or a central unit gNodeB (CU-gNB), or an eNodeB, or a CU-eNB, or any network node and / or network function. It should be noted that the terms "second network node 112," "target MN 112," and "target candidate MN" and "target MN" may be used interchangeably herein.

[0089] Embodiments herein also refer to a Secondary Node (SN) 110, or Source Secondary Node (S-SN), having, for example, a Secondary Cell Group (SCG) preconfigured (i.e., not connected) in the UE 120, which SN may be a gNodeB or central unit gNodeB (CU-gNB), an eNodeB or CU-eNB, or any network node and / or network function. It should be noted that the MN, S-SN, and T-SN may be from the same or different radio access technologies and may be associated with different core network nodes.

[0090] In this document, we often refer to the third network node 113 acting as a "secondary node (SN)", target candidate SN 113, or target SN 113. This is equivalent to saying it is a target candidate SN 113 or a network node associated with a configured target candidate PSCell. When the UE 120 connects to that cell, if the cell is associated with that node, transmissions to and from the UE 120 will be handled by that node. It should be noted that the terms "third network node 113", "target SN 113" and "target candidate SN" and "target SN" may be used interchangeably herein.

[0091] The present text states that a cell resides within a node, e.g., a target candidate cell resides within an S-SN or a t-SN, which is the same as saying that a cell is managed by a node, that a cell is associated with a node, that a cell belongs to a node, or that a cell belongs to a node.

[0092] "SN initiated CPC" corresponds to a procedure in which a source SN of an MR-DC configured UE 120 determines to configure CPC. Upon determining the source SN, it selects one or more target candidate cells (target candidate PSCells), where at least one cell is associated with the source SN and at least another cell is associated with a neighboring SN, e.g., based on reported measurements. If all target candidate cells are associated with the source SN, it is said to be "SN initiated intra-SN CPC", which may be referred to as a Release 16 solution. If at least one target candidate cell is associated with a neighboring SN, it is said to be "SN initiated inter-SN CPC", which may be referred to as a Release 17 solution.

[0093] In this specification, a candidate SN, SN candidate, or SN refers to an SCG configuration (e.g., RRCReconfiguration) that is prepared during a CPA procedure, provided to the UE 120 with an execution condition, and stored. ** ) and the UE 120 applies the message only if an execution condition is met. The candidate SN is associated with one or more PSCell candidate cells that the UE 120 may be configured with. ** RRCReconfiguration ** and may be applied by UE 120 during CHO execution. UE 120 may then execute the condition and access one of these candidate cells associated with the candidate SN that becomes the SN or simply the SN after execution (i.e., upon satisfaction of the execution condition).

[0094] This specification refers to procedures such as CPC configuration and CPC execution, and in most cases refers to procedures from the UE 120 perspective such as CPC execution. Since the messages stored and applied when the condition is met are RRCReconfiguration or RRCConnectionReconfiguration, other terms may be considered as synonyms such as conditional reconfiguration or conditional configuration. In terms of terminology, CHO may be interpreted in a broader sense to also cover the CPA (Conditional PSCell Change) procedure. In this specification, to refer to procedures between network nodes, conditional SN change is mainly referred to with reference to procedures from the UE 120 perspective, where a node changes the SN of a target candidate SN 113 (which may be the source SN or adjacent SN) to configure a CPC for at least one of its associated cells (cells associated with the target candidate SN 113).

[0095] In this specification, we refer to CPAC as a way of referring to either Conditional PSCell Addition (CPA) or CPC.

[0096] Although this specification refers to neighbor SNs and source SNs as different entities, both may be target candidate SNs 113 of a CPC.

[0097] The configuration of the CPC can be performed using the same IE as the conditional handover and can be called conditional configuration or conditional reconfiguration. The principle of configuration is the same as the configuration of trigger / execution conditions and the reconfiguration message that is applied when the trigger conditions are met. The configuration IE from 3GPP TS 38.331 is: -ConditionalReconfiguration The IE ConditionalReconfiguration is used to add, modify and release configurations of conditional configurations. ConditionalReconfiguration Information Element

[0098] [Table 1]

[0099] [Table 2]

[0100] -CondConfigId The IE CondConfigId is used to identify a CHO or CPC configuration. CondConfigId Information Element

[0101] [Table 3]

[0102] -CondConfigToAddModList The IE CHO-ConfigToAddModList relates to a list of conditional configurations to add or modify, and for each entry contains a cho-ConfigId and associated condExecutionCond and condRRCReconfig. CondConfigToAddModList information element

[0103] [Table 4]

[0104] [Table 5]

[0105] In different embodiments, these IEs are used differently, for example, when generated by the MN 111, generated by the source SN, generated by the target candidate SN 113, and so on.

[0106] In a different embodiment, if the CPC configuration is not configured as an MR-DC configuration of mrdc-SecondaryCellGroup (defined in 3GPP TS 38.331), the CPC is said to be in MN format. In other words, the UE 120 receives an RRCReconfiguration from the MN that may include mrdc-SecondaryCellGroup (e.g., if the UE 120 is also configured with an SCG MeasConfig for an inter-SN CPC), but the CPC is not in that container. That is, the above IEs (e.g., IE ConditionalReconfiguration) are not included in the mrdc-SecondaryCellGroup.

[0107] In a different embodiment, if the CPC configuration is configured as an MR-DC configuration of mrdc-SecondaryCellGroup (defined in 3GPP TS 38.331), the CPC is said to be in SN format. In other words, the UE 120 receives an RRCReconfiguration from the MN that may include the mrdc-SecondaryCellGroup, and the CPC is in that container. This means that the IEs listed above (e.g., the IE ConditionalReconfiguration) are included in the mrdc-SecondaryCellGroup (e.g., within a series of other nested IEs).

[0108] In this document we often refer to the "Secondary Node (SN)" or target SN 113, which is equivalent to saying that it is a target candidate SN 113, or a network node associated with a configured target candidate PSCell.

[0109] Several exemplary embodiments are described below.

[0110] Example A0. Some embodiments include a method for a wireless terminal, e.g., UE 120, or UE 120 configured with a current SCG and MR-DC by a source MN 111, receiving a CHO configuration including a configuration of a target candidate cell, the configuration being applied by the UE 120 when the reception of the CHO configuration satisfies an execution condition monitored by the UE 120; receiving at least one indication of an SCG state of a current SCG and setting an SCG state of the current SCG to SCG inactive or SCG active based on the indication; - when an execution condition is met, selecting a target candidate cell provided by, for example, one of the target MN 112 or the target SN 113, and applying a configuration to the selected target candidate cell; -Upon applying the configuration to a target candidate cell, e.g., one of the target MN 112 or the target SN 113, sending an RRC reconfiguration complete message (RRCReconfigurationComplete) to the selected target candidate cell and performing at least one of the following actions, e.g. related to the SCG state (or a combination thereof) indicated in the message: * RRC reconfiguration complete includes an indication of the current SCG's up-to-date state. o If the target candidate configuration includes an SCG configuration, consider the SCG state of the target candidate as the latest state of the current SCG and take action accordingly, e.g., perform random access to the target candidate PSCell if the latest state of the current SCG is activated. If the target candidate configuration includes an SCG configuration, assume that the SCG state of the target candidate is always activated, regardless of the current SCG state, and take actions accordingly, such as performing random access to the target candidate PSCell. If the target candidate's configuration contains an SCG configuration, always consider the target candidate's SCG state to be deactivated, regardless of the current SCG state, and take action accordingly. If the target candidate configuration includes an SCG configuration, assume that the target candidate's SCG state is set to the SCG configuration, regardless of the current SCG state, and perform actions accordingly.

[0111] Example A0b. In an example according to example A0, if the target candidate cell configuration that UE 120 applies includes an SCG configuration, UE 120 performs at least one of the actions related to the SCG state.

[0112] Example A1. In an example according to example A0, UE 120 ignores SCG state information or configuration included in the target candidate SCG configuration when determining the SCG state of the selected target candidate SCG.

[0113] Example A2. In an example according to example A0, UE120 receives one or more indications about the SCG status of the current SCG before receiving the CHO MR-DC configuration, or after UE120 receives the CHO MR-DC configuration and / or while UE120 is monitoring the CHO execution conditions.

[0114] Example A3. In an example according to example A0, the SCG state of the current SCG is the SCG state indicated by the last received indication of the SCG state before UE 120 applies the selected target candidate SCG.

[0115] Example A4. In an example according to example A0, the RRC reconfiguration complete is a MN RRC reconfiguration complete that is triggered in response to the UE 120 applying the MCG configuration.

[0116] EXAMPLE A5. In an example according to example A0, the RRC reconfiguration complete is an SN RRC reconfiguration complete contained within a MN RRC reconfiguration complete, and the SN RRC reconfiguration complete is triggered in response to the UE 120 applying the SCG configuration.

[0117] Example A20. Some embodiments include a method in a first network node 111 acting as a master node (MN) for a UE 120 configured with MR-DC, the UE 120 being configured with a current SCG and CHO, the method comprising: - transmitting a CHO configuration including one or more target candidate SCG configurations to the UE 120, each target candidate SCG configuration and each MCG configuration being applied by the UE 120 when an execution condition monitored by the UE 120 upon receipt of the CHO configuration is satisfied; - transmitting one or more indications about an SCG status of a current SCG, where the SCG status of the current SCG may be set to SCG inactive or SCG active; A method in a second network node, for example, the MN 112, operating as a master node (MN) includes: - RRCReconfigurationComplete from UE 120 to SN indicating that UE 120 has performed CHO ** receiving an RRCReconfigurationComplete message, which may also include an RRCReconfigurationComplete message sent by the UE 120 having applied the selected target candidate MCG and target candidate SCG configurations; - forwarding a reconfiguration complete message and an indication of the determined SCG state of the selected target candidate SCG to a third network node acting as a target candidate SN 113 for the selected target candidate SCG.

[0118] Example A21. An example according to example A20, in which a first network node 111 acting as an MN for UE 120 decides to configure UE 120 in a CHO with MR-DC configuration and triggers a request to a second network node requesting MR-DC configuration for UE 120, i.e. one or more target candidate SCG configurations.

[0119] EXAMPLE A22. In an example according to example A20, one or more indications about the SCG status of the current SCG may be determined by the source MN 111 or the source SN based on traffic demands at the MN and / or SN.

[0120] Example A30. Some embodiments include a method in a third network node 113 acting as a candidate secondary node (SN) for an MR-DC configured UE 120, the UE 120 being configured with a current secondary cell group (SCG) in a CHO including an MR-DC configuration, possibly setting an SCG state to inactive or active, the method comprising: -receiving a request for CHO from a target candidate MN 112, generating one or more target candidate PSCell configurations for CHO with MR-DC, and transmitting these one or more target candidate PSCell configurations to the target candidate MN 112, in which the UE 120 applies one of the configurations when one execution condition monitored by the UE 120 upon receiving the CHO configuration is satisfied; receiving, from the target candidate MN 112, a reconfiguration complete message for a selected target candidate SCG and an indication of a determined SCG state of the selected target candidate SCG; - Performing an action on the UE 120 according to the indicated SCG state of the selected target candidate SCG.

[0121] Example A40. Some embodiments include a method in a second network node 112 acting as a master node (MN) target candidate for a conditional handover configured UE 120, the method comprising: - receiving a handover request for a conditional handover from a first network node 111 acting as a master node for a UE 120 configured with MR-DC having at least one SCG; - transmitting a handover request acknowledgement message including a configuration of a target candidate cell, the configuration being applied by the UE 120 when an execution condition monitored by the UE 120 due to reception of the CHO configuration is satisfied; - Receiving an RRC reconfiguration complete from the UE 120 and performing at least one of the following actions: In the RRC reconfiguration complete message, it further receives an indication of the latest SCG state that UE 120 has with respect to the source SCG, and assumes that UE 120 will operate in the target SCG according to the indicated state. o If the target candidate configuration includes an SCG configuration, consider the SCG state of the target candidate as the latest state of the current SCG and perform actions accordingly, e.g., perform random access to the target candidate PSCell if the latest state of the current SCG is active. o If the target candidate configuration includes an SCG configuration, then regardless of the current SCG state, the SCG state of the target candidate is always considered to be active and actions such as performing random access with UE 120 are taken accordingly, and the target candidate PSCell responds, for example, to a random access request / preamble of UE 120. If the target candidate configuration contains an SCG configuration, always consider the target candidate's SCG state to be inactive, regardless of the current SCG state, and take action accordingly. If the target candidate configuration includes an SCG configuration, assume that the target candidate's SCG state is set to the SCG configuration, regardless of the current SCG state, and perform actions accordingly. Possibly indicating to the target candidate SN 113 the SCG state that applies to the terminating UE 120.

[0122] Some further embodiments Indication of SCG inactivity during CHO in MR-DC Indication of SCG inactivity during CHO in MR-DC (related to exemplary set A) is shown in FIG.

[0123] In one set of embodiments, some embodiments include Executed by the UE 120 or, for example, the source MN 111 This relates to and can be incorporated into a method executed by the UE 120 or, for example, the source MN 111 described above. The method includes: -Having an MR-DC configuration in which the SCG state may be set to active or inactive; Receiving a CHO configuration including an MR-DC configuration from the network, which corresponds to an RRCReconfiguration message including a configuration of the CHO with MR-DC in the target configuration, the CHO configuration being applied if a condition is met (wherein the SCG message to be applied is an RRCReconfiguration message). ** ) and o In some embodiments, the message includes an indication that the condition is met and that UE 120 should continue to use the same SCG state as when the new target configuration was applied. In other words, if UE 120 has deactivated the current SCG at the time when UE 120 performs CHO in MR-DC, UE 120 selects a target configuration, applies the SCG configuration to the selected target candidate, and considers the SCG state of the target candidate SCG to be inactive. o In some embodiments, the CHO configuration also includes measurement configuration of the SCG, such as SCG MeasConfig, which includes measurement objects associated with execution condition events and / or frequencies (e.g., SSB frequencies, SSB ARFCNs) of the target candidate PSCell, and reporting configuration for configuring measurement identifiers referenced in the CHO configuration of the target candidate. - In response to the CHO with MR-DC being configured, sending an RRCReconfigurationComplete to the network; - Receiving an indication (e.g., an RRCReconfiguration message) from a network (e.g., from a network node acting as an MN or a network node acting as an SN) indicating an SCG state (operation mode) and / or indicating a change in the SCG state (operation mode); o For example, if the state was activated, this could be an indication to change it to inactive, and if the state was deactivated, this could be an indication to change it to active. ○ When UE 120 is configured with CHO with MR-DC and is monitoring the running conditions of CHO with MR-DC, UE 120 may receive one or more indications to set an SCG state. o In some embodiments, UE 120 receives the indication before being configured in CHO with MR-DC, i.e. when UE 120 is configured in CHO, UE 120 has already received the SCG status indication. In some embodiments, the UE 120 receives the indication after being configured with CHO with MR-DC. In some embodiments, UE 120 receives the indication when configured in a CHO with MR-DC, i.e., within the same message in which UE 120 is configured in a CHO with MR-DC, UE 120 also receives an indication of the SCG status. o This may be one or more indications about the SCG state of the current SCG, which may be set to SCG inactive or SCG active. The current SCG is the SCG that was configured in UE 120 when UE 120 received the CHO with MR-DC configuration. o The indication may be an indication in the MCG configuration or in the SCG configuration (e.g. generated by a network node acting as a SN). - selecting a target candidate when an execution condition is met and applying a target candidate configuration including the selected target candidate MCG and SCG configurations; - determining that the SCG state of the selected target candidate SCG is the same SCG state as the current SCG; o In some embodiments, this can be achieved by delta signaling. A target candidate SN 113 capable of the SCG deactivation feature can indicate this to the UE 120 with a flag, allowing the UE 120 to be configured to deactivate the SCG if the current SCG is inactive when the execution conditions are met. The delta signaling aspect is essentially that the target candidate SN 113 does not include an indication of the deactivated SCG, the absence of which means that the UE 120 considers the target candidate SCG state to be the SCG state of the current SCG when the UE 120 executed CPC. - upon applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending an RRCReconfigurationComplete to the first network node and performing further actions according to the determined SCG state of the selected target candidate SCG. In some embodiments, sending an RRCReconfigurationComplete indicates that a condition at the UE 120 has been met and the UE 120 has applied the target configuration. ** RRCReconfigurationComplete ** The message RRCReconfiguration is forwarded from the MN to the SN. ** still uses the same SCG state as before it was applied. In some embodiments, an RRC reconfiguration complete (e.g., RRCReconfigurationComplete **) also includes an indication of the SCG state of the selected SCG, which is the same state as the SCG configured in the UE 120 when the UE 120 performed the CHO. One advantage of this embodiment is that the SCG state is ** The advantage of this is that the MN does not need to worry about indicating its SCG status to the target candidate SN 113 via XnAP information, since the SCG status is considered to be included within the SN 113 . In some embodiments, an RRC reconfiguration complete (e.g., RRCeconfigurationComplete ** ) also includes an indication of the SCG status of the selected SCG proposed / requested by the UE 120. In some embodiments, an RRCReconfigurationComplete message to the T-SN indicating that the conditions at the UE 120 are met and the UE 120 has applied the target configuration and performed the PSCell change. ** The UE 120 starts operating according to the SCG state that it had before the RRCReconfigurationComplete message. ** still uses the same SCG state as before it was applied. o In some embodiments, if the determined SCG state is active, upon determining the state, the UE 120 triggers random access to the selected target SCG. o In some embodiments, if the determined SCG state is inactive, upon determining the state, the UE 120 does not trigger random access to the selected target SCG. o In some embodiments, if the determined SCG state is inactive, then upon determining the state, UE 120 triggers random access to the selected target SCG only if explicitly indicated by the network (e.g., if the network wants UE 120 to prepare for faster activation later). In other words, even if the SCG is changed to an inactive SCG, UE 120 is ready to activate the SCG shortly thereafter by performing a random access. o In some embodiments, UE 120 receives a target candidate SCG configuration (as part of the CHO with MR-DC configuration) that includes configurations specific to the SCG state. As an example, some configurations are applied only if the SCG state is determined to be activated. In an example, some configurations are applicable only if the SCG state is determined to be deactivated. When UE 120 applies the CHO with MR-DC configuration, it applies the SCG configuration related to the determined SCG state and starts operating according to that configuration. In an alternative example, UE 120 may apply the received configuration to both (or all) SCG states, e.g., both SCG active and SCG inactive, but start operating according to the configuration of the determined state. As an example, if the determined SCG state is inactive, UE 120 will start operating according to the configuration of the deactivated SCG, not according to the configuration specific to the activated SCG, but will also store the configuration for the activated SCG. Then, if the SCG state is changed to SCG Active, UE 120 will instead begin operating according to the configuration stored for the activated SCG (but not according to the configuration specific to the deactivated SCG). o In some embodiments, UE 120 receives (as part of a CHO with MR-DC configuration) an MCG configuration that includes configuration specific to an SCG state (i.e., some parts of the configuration apply only if the SCG state is determined to be active, and other parts of the configuration apply only if the SCG state is determined to be inactive). When UE 120 applies a CHO with MR-DC configuration, it selects the MCG configuration associated with the determined SCG state. MCG Apply the configuration and start operating according to the configuration.

[0124] Some embodiments include Executed by source MN111 This includes a method, which is related to and may be incorporated into the method performed by the first network node 111 described above, comprising: - sending a message to a target candidate master node (MN) 112 requesting configuration of a CHO with MR-DC configuration, the message including a current configuration of the UE 120 indicating that the UE 120 is configured with a deactivated SCG or is capable of a deactivated SCG; In some embodiments, the message is a HANDOVER REQUEST message. o In some embodiments, the current SCG configuration is included in the SN configuration within the Handover Preparation Information. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. Receiving a message including a CHO with MR-DC configurations from a target candidate MN 112, the MR-DC configurations including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by the UE 120 upon satisfaction of an execution condition monitored by the UE 120 due to receipt of a CPC configuration, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration **and in an SCG RRC reconfiguration message, denoted as In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. In some embodiments, the message is generated when the condition is met and the target configuration RRCReconfiguration ** and an indication that the UE 120 is permitted (and / or must) continue to use the same SCG state as when the SCG was applied, the presence of which indicates deactivation of the SCG. It would be Absent parameter the law of nature This indication may be an absent parameter, the presence of which indicates deactivation of the SCG, and a second parameter indicating that UE 120 can (and / or will) continue to use the current SCG state in the new SCG to be applied. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - Sending an RRCReconfiguration message to the UE 120 including a configuration of CHO with MR-DC; -receiving an RRCReconfigurationComplete from the UE 120, indicating that a CHO with MR-DC has been configured; - changing the SCG state of the UE 120, for example by sending an RRCReconfiguration message to the UE 120 including a new SCG state, where if the state is active, it is changed to inactive, and if the state is inactive, it is changed to active; Receiving a response message RRCReconfigurationComplete from the UE 120, indicating that the SCG state has been changed.

[0125] Some embodiments include Executed by target MN112 This includes a method, which is related to and may be incorporated into the method performed by the second network node 112 described above. The method includes: - sending a message to the target candidate SN 113 requesting configuration of the CHO with MR-DC configuration, the message including the current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is an S-NODE ADDITION REQUEST message. o In some embodiments, the current SCG configuration is included in the target SN113 configuration in CG-ConfigInfo. o In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. o In some embodiments, the target MN 112 decides to configure the UE 120 with MR-DC in a CHO configuration. - Target candidate secondary node (SN )mosquito receiving a message including an SCG configuration from the UE 120 including one or more target candidate SCG configurations, each target candidate SCG configuration being applied by the UE 120 when an execution condition monitored by the UE 120 due to receipt of the CHO configuration is satisfied, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** In the SCG RRC reconfiguration message, In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. In some embodiments, the message is generated when the condition is met and the target configuration RRCReconfiguration **The indication may include an indication that UE 120 is permitted (and / or must) continue to use the same SCG state in the new SCG that was applied, which may be an absent parameter whose presence indicates deactivation of the SCG, or an absent parameter whose presence indicates deactivation of the SCG, and a second parameter indicating that UE 120 can (and / or will) continue to use the current SCG state in the new SCG that is applied. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - Sending a response message, such as HAND OVER REQUEST ACKNOWLEDGE, to the source MN indicating that the CHO with MR-DC has been configured; - RRCReconfigurationComplete from UE 120 to T-SN indicating that the conditions at UE 120 are met and UE 120 has applied CHO with the target configuration and MR-DC configuration ** receiving an RRCReconfigurationComplete message including -RRCReconfigurationComplete, a message containing an indication of the current SCG state of the UE 120 ** forwarding the message to the T-SN; Some embodiments include a method performed by a target secondary node (SN) candidate, the method comprising: - receiving a message from a target master node (MN) requesting configuration of an SCG of the CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is contained in the target SN113 configuration in CG-ConfigInfo. -RRCReconfiguration including target configuration of UE 120 ** sending a message including the following to a master node (MN); ○The message is S-NODE ADDITION REQUEST ACK This is a message. The message is sent when the conditions are met and the target configuration is reconfigured. ** The SCG state includes an indication that the UE 120 is permitted to continue using the same SCG state as when the SCG state was applied. ○ Target configuration of UE 120 RRCReconfiguration ** does not contain information about which SCG state to use. -From the MN, a message RRCReconfigurationComplete containing an indication from the UE 120 regarding the current SCG state ** Receiving a message; and If the SCG state is currently inactive, do not expect any immediate random access from the UE 120 - Deciding whether to maintain or change the current SCG state.

[0126] In some embodiments, the target secondary node (SN) 113 receives an RRCReconfiguration ** For example, the target configuration of UE 120 may include some configuration specific to when the SCG state is to be activated and may also include some configuration specific to when the SCG state is to be deactivated.

[0127] The UE 120 always sets the SCG state of the SCG target candidates to inactive.

[0128] In one set of embodiments, some embodiments include: Executed by the UE 120 or, for example, the source MN 111 This includes a method for controlling a UE 120 or, for example, Source MN111 The method relates to and may be incorporated into a method performed by -Having an MR-DC configuration in which the SCG state can be set to active or inactive; Receive a CHO configuration including an MR-DC configuration from the network, which corresponds to an RRCReconfiguration message including a configuration of the CHO with MR-DC in the target configuration, and the CHO configuration is applied if a condition is met. profit (Here, the applicable SCG message is RRCReconfiguration ** ), and o In some embodiments, the CHO configuration also includes an SCG measurement configuration, such as an SCG MeasConfig, that includes reporting configuration for configuring measurement objects associated with execution condition events and / or frequencies (e.g., SSB frequencies, SSB ARFCNs) of the target candidate PSCell and measurement identifiers referenced in the CHO configuration of the target candidate. - In response to the CHO with MR-DC being configured, sending an RRCReconfigurationComplete to the network; - Receiving an indication (e.g., an RRCReconfiguration message) from a network (e.g., from a network node acting as an MN or a network node acting as an SN) indicating an SCG state (operation mode) and / or indicating a change in the SCG state (operation mode); For example, if the state was activated, this could be an indication to change it to inactivated, and if the state was deactivated, this could be an indication to change it to activated. o When UE 120 is configured with a CHO including MR-DC and is monitoring the execution conditions of the CHO including MR-DC, UE 120 may receive one or more indications to set an SCG state. o In some embodiments, UE 120 receives the indication before being configured with a CHO including MR-DC, i.e., when UE 120 is configured with a CHO, UE 120 has already received the SCG status indication. o In some embodiments, the UE 120 receives the indication after being configured with a CHO that includes MR-DC. o In some embodiments, UE 120 receives the indication when it is configured with a CHO that includes MR-DC, i.e., in the same message in which UE 120 is configured with a CHO that includes MR-DC, UE 120 also receives an indication of the SCG status. o This may be one or more indications about the SCG state of the current SCG, which may be set to SCG inactive or SCG active. The current SCG is the SCG that was configured in UE 120 when UE 120 received the CHO containing the MR-DC configuration. o The indication may be an indication in the MCG configuration or the SCG configuration (e.g., generated by a network node acting as a SN). - selecting a target candidate when an execution condition is met and applying a target candidate configuration including the selected target candidate MCG and SCG configurations; - setting the SCG state of the selected target candidate to inactive; - Upon applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending an RRCReconfigurationComplete to the first network node and performing further actions according to the SCG state of the selected target candidate SCG. In some embodiments, sending an RRCReconfigurationComplete indicates that a condition at the UE 120 has been met and the UE 120 has applied the target configuration. ** RRCReconfigurationComplete ** is transferred from the MN to the SN, and the UE 120 is using a deactivated SCG state. o In some embodiments, upon determining the state, the UE 120 does not trigger random access to the selected target SCG. o In some embodiments, upon determining the state, UE 120 triggers random access to the selected target SCG only if explicitly indicated by the network (e.g., if the network wants UE 120 to prepare for faster activation later). In other words, even if the SCG is changed to a deactivated SCG, UE 120 will be ready to activate the SCG shortly thereafter by performing a random access.

[0129] In one set of embodiments, some embodiments include: Executed by source MN111 This includes a method, which is related to and may be incorporated into the method performed by the first network node 111 described above, comprising: - sending a message to the target candidate MN 112 requesting configuration of a CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is a HANDOVER REQUEST message. o In some embodiments, the current SCG configuration is included in the SN configuration within the Handover Preparation Information. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. Receiving a message including a CHO with MR-DC configurations from a target candidate MN 112, the MR-DC configurations including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by the UE 120 upon satisfaction of an execution condition monitored by the UE 120 due to receipt of a CPC configuration, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** In the SCG RRC reconfiguration message, In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If applies, the UE 120 should always set the SCG state to inactive. In some embodiments, the target configuration of the UE 120 (RRCReconfiguration ** does not contain information about which SCG state to use. - Sending an RRCReconfiguration message to the UE 120 including a configuration of CHO with MR-DC; Receiving an RRCReconfigurationComplete from the UE 120, indicating that CHO with MR-DC has been configured.

[0130] Some embodiments include Executed by target MN112 This includes a method, which is related to and may be incorporated into the method performed by the second network node 112 described above. The method includes: - sending a message to the target candidate SN 113 requesting configuration of a CHO with MR-DC configuration, the message including the current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is an S-NODE ADDITION REQUEST message. o In some embodiments, the current SCG configuration is included in the target SN 113 configuration in CG-ConfigInfo. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG. In some embodiments, the target MN 112 decides to configure the UE 120 with MR-DC in a CHO configuration. receiving a message including an SCG configuration from a target candidate SN 113, the message including one or more target candidate SCG configurations, each target candidate SCG configuration being applied by the UE 120 when an execution condition monitored by the UE 120 due to the reception of the CHO configuration is satisfied, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** In the SCG RRC reconfiguration message, In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If applies, the UE 120 should always set the SCG state to inactive. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - transmitting a response message, for example, HAND OVER REQUEST ACKNOWLEDGE, to the source MN 111 indicating that a CHO with an MR-DC has been configured; - RRCReconfigurationComplete from UE 120 to T-SN indicating that the conditions at UE 120 are met and UE 120 has applied CHO with the target configuration and MR-DC configuration ** receiving an RRCReconfigurationComplete message including -RRCReconfigurationComplete ** forwarding the message to T-SN 113; and Setting the SCG state of the UE 120 to inactive.

[0131] Some embodiments include Run by target candidate SN113 This includes a method, which is related to and may be incorporated into the method performed by the third network node 113 described above, comprising: - receiving a message from a target MN 112 requesting an SCG configuration for a CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or may be deactivated; The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is contained in the target SN113 configuration in CG-ConfigInfo. Information about the current SCG state of the UE 120 is included in the message. -RRCReconfiguration including target configuration of UE 120 ** Transmitting a message including the following to a master node (MN), for example, the MN 111 or the MN 112; ○The message is S-NODE ADDITION REQUEST ACK This is a message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If applies, the UE 120 should always set the SCG state to inactive. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. -RRCReconfigurationComplete, indicating that the UE 120 has performed a conditional handover ** Receiving a message from the target MN 112; Setting the SCG state of the UE 120 to inactive.

[0132] The UE 120 always sets the SCG status of the SCG target candidates to active.

[0133] In one set of embodiments, some embodiments include: Executed by the UE 120 or, for example, the source MN 111 This relates to and can be incorporated into a method executed by the UE 120 or, for example, the source MN 111 described above. The method includes: -Having an MR-DC configuration in which the SCG state can be set to active or inactive; Receive a CHO configuration including an MR-DC configuration from the network, which corresponds to an RRCReconfiguration message including a configuration of the CHO with MR-DC in the target configuration, and the CHO configuration is applied if a condition is met (wherein the SCG message to be applied is an RRCReconfiguration message). ** ) and o In some embodiments, the CHO configuration includes measurement configuration for an SCG, such as an SCG MeasConfig, that includes measurement objects associated with execution condition events and / or frequencies (e.g., SSB frequencies, SSB ARFCNs) of the target candidate PSCell, and reporting configuration for configuring measurement identifiers referenced in the CHO configuration of the target candidate. - In response to the CHO with MR-DC being configured, sending an RRCReconfigurationComplete to the network; - Receiving an indication (e.g., an RRCReconfiguration message) from a network (e.g., from a network node acting as an MN or a network node acting as an SN) indicating an SCG state (operation mode) and / or indicating a change in the SCG state (operation mode); For example, if the state was activated, this could be an indication to change it to inactivated, and if the state was deactivated, this could be an indication to change it to activated. o When UE 120 is configured with CHO with MR-DC and is monitoring the execution conditions of CHO with MR-DC, UE 120 may receive one or more indications to set an SCG state. o In some embodiments, UE 120 receives the indication before being configured in CHO with MR-DC, i.e., when UE 120 is configured in CHO, UE 120 has already received the SCG status indication. o In some embodiments, the UE 120 receives the indication after being configured in CHO with MR-DC. o In some embodiments, UE 120 receives an indication when it is configured in CHO with MR-DC, i.e., in the same message in which UE 120 is configured in CHO with MR-DC, UE 120 also receives an indication of the SCG status. o This may be one or more indications about the SCG state of the current SCG, which may be set to SCG inactive or SCG active. The current SCG is the SCG that was configured in UE 120 when UE 120 received the CHO with MR-DC configuration. o The indication may be an indication in the MCG configuration or the SCG configuration (e.g., generated by a network node acting as a SN). - selecting a target candidate when an execution condition is met and applying a target candidate configuration including the selected target candidate MCG and SCG configurations; - setting the SCG state of the selected target candidate to active; - upon applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending an RRCReconfigurationComplete to the first network node and performing further actions according to the determined SCG state of the selected target candidate SCG. In some embodiments, sending an RRCReconfigurationComplete indicates that a condition at the UE 120 has been met and the UE 120 has applied the target configuration. ** RRCReconfigurationComplete ** is transferred from the MN to the SN, and the UE 120 is using the activated SCG state. o In some embodiments, upon determining the state, the UE 120 triggers random access to the selected target SCG.

[0134] In one set of embodiments, some embodiments include: Executed by source MN111This includes a method, which is related to and may be incorporated into the method performed by the first network node 11 described above, comprising: - sending a message to the target candidate MN 112 requesting configuration of a CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is a HANDOVER REQUEST message. o In some embodiments, the current SCG configuration is included in the SN configuration within the Handover Preparation Information. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. - receiving a message including a CHO with MR-DC configurations from a target candidate MN 112, the MR-DC configurations including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by the UE 120 upon satisfaction of an execution condition monitored by the UE 120 due to receipt of a CPC configuration, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** SCG indicated by in an RRC reconfiguration message; and In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If this applies, the UE 120 should always set the SCG state to active. In some embodiments, the target configuration of the UE 120, RRCReconfiguration **does not contain information about which SCG state to use. - Sending an RRCReconfiguration message to the UE 120 including a configuration of CHO with MR-DC; Receiving an RRCReconfigurationComplete from the UE 120, indicating that CHO with MR-DC has been configured.

[0135] Some embodiments include Executed by target MN112 This includes a method, which is related to and may be incorporated into the method performed by the second network node 112 described above. The method includes: - sending a message to the target candidate SN 113 requesting configuration of a CHO with MR-DC configuration, the message including the current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is an S-NODE ADDITION REQUEST message. o In some embodiments, the current SCG configuration is included in the target SN 113 configuration in CG-ConfigInfo. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. In some embodiments, the target MN 112 decides to configure the UE 120 with MR-DC in a CHO configuration. receiving a message from a target candidate SN 113, the message including an SCG configuration including one or more target candidate SCG configurations, each target candidate SCG configuration to be applied by the UE 120 when an execution condition monitored by the UE 120 due to the reception of the CHO configuration is satisfied, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration** In the SCG RRC reconfiguration message, In some embodiments, the message is A DDITION R This is an EQUEST ACK message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If this applies, the UE 120 should always set the SCG state to active. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - transmitting a response message, for example, HAND OVER REQUEST ACKNOWLEDGE, to the source MN 111 indicating that a CHO with an MR-DC has been configured; - RRCReconfigurationComplete from UE 120 to T-SN indicating that the conditions at UE 120 are met and UE 120 has applied CHO with the target configuration and MR-DC configuration ** receiving an RRCReconfigurationComplete message including -RRCReconfigurationComplete, a message containing an indication of the current SCG state of the UE 120 ** and forwarding the message to the target (T)-SN 113.

[0136] Some embodiments include Run by target candidate SN113 This includes a method, which is related to and may be incorporated into the method performed by the third network node 113 described above, comprising: - receiving a message from a target MN 112 requesting an SCG configuration for a CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or may be deactivated; The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is contained in the target SN113 configuration in CG-ConfigInfo. Information about the current SCG state of the UE 120 is included in the message. -RRCReconfiguration including target configuration of UE 120 ** Transmitting a message including the following to an MN, for example, the MN 111 or the MN 112; ○The message is S-NODE ADDITION REQUEST ACK This is a message. In some embodiments, the condition is met and the target configuration RRCReconfiguration ** If this applies, the UE 120 should always set the SCG state to active. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. -RRCReconfigurationComplete, indicating that the UE 120 has performed a conditional handover ** Receiving a message from the target MN 112; Setting the SCG state of the UE 120 to active.

[0137] The UE 120 sets the SCG state of the target candidates of the SCG to a preconfigured value.

[0138] The method includes the UE 120 setting the SCG status of the target candidates of the SCG to a value preconfigured by the MN, such as the MN 111, such as active or inactive. The logic reacts to the target candidate MN 112 and / or the target candidate SN 113 depending on the traffic evaluation after the CHO, and possibly sets the SCG to active or inactive after the CHO. Non One advantage here is that it works even if the target candidate does not support a deactivated SCG.

[0139] UE 120 sets the SCG state of the SCG target candidates to the value configured in the CHO+MR-DC configuration.

[0140] If the target candidate configuration includes an SCG configuration, then regardless of the current SCG state when the conditions are met and handover is performed, the SCG state of the target candidate is deemed to be the state set in the SCG configuration and action is taken accordingly.

[0141] A source MN 111 indicates changes in SCG status to a candidate target MN 112.

[0142] In one set of embodiments, some embodiments include: Executed by source MN111 This includes a method, which is related to and may be incorporated into the method performed by the first network node 111 described above, comprising: - sending a message to the target candidate MN 112 requesting configuration of a CHO with MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is a HANDOVER REQUEST message. o In some embodiments, the current SCG configuration is included in the SN configuration within the Handover Preparation Information. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. - receiving a message including a CHO with MR-DC configurations from a target candidate MN 112, the MR-DC configurations including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by the UE 120 upon satisfaction of an execution condition monitored by the UE 120 due to receipt of a CPC configuration, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** In the SCG RRC reconfiguration message, In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. In some embodiments, the message is generated when the condition is met and the target configuration RRCReconfiguration ** The indication may include an indication that UE 120 is permitted (and / or must) continue to use the same SCG state in the new SCG that was applied, which may be an absent parameter whose presence indicates deactivation of the SCG. The indication may be an absent parameter whose presence indicates deactivation of the SCG and a second parameter indicating that UE 120 may (and / or will) continue to use the current SCG state in the new SCG that is applied. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - Sending an RRCReconfiguration message to the UE 120 including a configuration of CHO with MR-DC; -receiving an RRCReconfigurationComplete from the UE 120, indicating that a CHO with MR-DC has been configured; - if there is a change in the SCG state of UE120 while configured in CHO with MR-DC (e.g., if the SCG state is changed from active to inactive, or if the SCG state is changed from inactive to active), the source MN 111 sends a UE120-related message, such as a UE120 CONFIGURATION UPDATE, to the target candidate MN 112 to inform it of the change in the current SCG state of UE120. In some embodiments, the source master node (MN) 111 receives from the target candidate master node (MN) 112 an updated configuration for a CHO with MR-DC, e.g., a configuration with an updated SCG configuration, e.g., a different SCG state compared to a previous / current configuration, a configuration including different SCG / PSCell / SN candidates, a CHO configuration without MR-DC configuration, or a configuration that previously included an MR-DC configuration. R The source master node (MN) 111 then receives a message with an updated configuration of the CHO with MR-DC, such as a change that MR-DC (SCG) configuration has been added to a CHO configuration that did not have MR-DC configuration. The configuration change may also include a corresponding change in execution conditions. The source master node (MN) 111 then sends an RRCReconfiguration message to the UE 120 to update the CHO configuration accordingly, for example by including the updated CHO with MR-DC (or simply CHO) configuration to the UE 120.

[0143] Some embodiments include Executed by target MN112 This includes a method, which is related to and may be incorporated into the method performed by the second network node 112 described above. The method includes: - sending a message to the target candidate SN 113 requesting configuration of the CHO with MR-DC configuration, the message including the current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or can be deactivated; In some embodiments, the message is an S-NODE ADDITION REQUEST message. o In some embodiments, the current SCG configuration is included in the target SN 113 configuration in CG-ConfigInfo. In some embodiments, the message includes the current SCG state of the UE 120, e.g., activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE 120. In some embodiments, the target MN 112 decides to configure the UE 120 with MR-DC in a CHO configuration. receiving a message from a target candidate SN 113, the message including an SCG configuration including one or more target candidate SCG configurations, each target candidate SCG configuration to be applied by the UE 120 when an execution condition monitored by the UE 120 due to the reception of the CHO configuration is satisfied, each target candidate SCG configuration being applied by the UE 120 in response to an RRCReconfiguration ** In the SCG RRC reconfiguration message, In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. In some embodiments, the message is generated when the condition is met and the target configuration RRCReconfiguration ** The indication may include an indication that UE 120 is permitted (and / or must) continue to use the same SCG state in the new SCG that is applied, which may be an absent parameter whose presence indicates deactivation of the SCG, or an absent parameter whose presence indicates deactivation of the SCG, and a second parameter indicating that UE 120 can (and / or will) continue to use the current SCG state in the new SCG that is applied. In some embodiments, the target configuration of the UE 120, RRCReconfiguration **does not contain information about which SCG state to use. - transmitting a response message, for example, a HANDOVER REQUEST ACK, to the source MN 111 indicating that a CHO with an MR-DC has been configured; - receiving a message from the source master node (MN) 111 informing that there is a change in the current SCG state of the UE 120 (e.g., the SCG state of the UE 120 was active and has been changed to inactive, or the state of the UE 120 was inactive and has been changed to active); In some embodiments, the target master node (MN) 112 sends a message to the target candidate secondary node (SN) 113 to notify it that the current SCG state of the UE 120 has changed (e.g., from inactive to active or from active to inactive). In some embodiments, the target master node (MN) 112 receives a message from the target candidate secondary node (SN) 113 with an updated SCG configuration for the CHO with MR-DC configuration (in response to notifying the target candidate secondary node (SN) 113 of a change in the current SCG state of the UE 120). o In some embodiments, the target master node (MN) 112 determines whether to change the MR-DC configuration as part of the CHO configuration based on receiving information about the changed current state of the SCG and / or receiving an updated SCG configuration from the target candidate secondary node (SN) 113. This may include a CHO configuration with a configured SCG configuration, e.g., a different SCG state compared to the previous / current configuration, a CHO configuration with different SCG / PSCell / SN candidates, a CHO configuration without an MR-DC configuration, or a change where an MR-DC (SCG) configuration has been added to a CHO configuration that did not previously include an MR-DC configuration. The configuration change may also include a change in the corresponding execution conditions, e.g., SCG. The target master node (MN) 112 sends a message to the source master node (MN) 111 to inform it about the updated CHO configuration. In some embodiments, the target master node (MN) 112 stores information about the current SCG state of the UE 120. It then sends a message (e.g., RRCReconfigurationComplete to the T-SN 113) indicating that the conditions in the UE 120 are met and the UE 120 has applied the target configuration and CHO with MR-DC configuration. ** Upon receiving an RRCReconfigurationComplete from the UE 120, the UE 120 forwards an indication on the current SCG state to the target candidate secondary node (SN) 113. - RRCReconfigurationComplete from UE 120 to T-SN indicating that the conditions at UE 120 are met and UE 120 has applied CHO with the target configuration and MR-DC configuration ** receiving an RRCReconfigurationComplete message including -RRCReconfigurationComplete, a message containing an indication of the current SCG state of the UE 120 ** and forwarding the message to the T-SN 113.

[0144] Some embodiments include Run by target candidate SN113 This includes a method, which is related to and may be incorporated into the method performed by the third network node 113 described above, comprising: - receiving a message from a target master node (MN) 112 requesting configuration for an SCG of a CHO having an MR-DC configuration, the message including a current configuration of the UE 120 and indicating that the UE 120 is configured with a deactivated SCG or may be deactivated; The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is contained in the target SN113 configuration in CG-ConfigInfo. Information about the current SCG state of the UE 120 is included in the message. -RRCReconfiguration including target configuration of UE 120 ** sending a message including the following to a master node (MN); The message is an S-NODE ADDITION REQUEST message. In some embodiments, the message is generated when the condition is met and the target configuration RRCReconfiguration ** The SCG state includes an indication that the UE 120 is permitted to continue using the same SCG state as when the SCG state was applied. In some embodiments, the target configuration of the UE 120, RRCReconfiguration ** does not contain information about which SCG state to use. - Receiving a message from the target MN 112 that the current SCG state of the UE 120 has changed (eg, from inactive to active, or from active to inactive). In some embodiments, the target candidate secondary node (SN) 113 decides to update the SCG configuration of the CHO configuration of the UE 120 and sends a message including the updated configuration to the target MN 112. A change in the SCG configuration may include, for example, one or more PSCell (SCG) configurations no longer being part of the CHO configuration, e.g., a CHO configuration previously included in an SCG (MR-DC) configuration no longer includes such a configuration, or a PSCell (SCG) configuration is added to the CHO configuration.

[0145] Source MN111 indicates changes in SCG status to candidate target MN112 after CHO execution.

[0146] This is related to and may be incorporated into the method performed by the first network node 111 described above.

[0147] In an alternative solution, the source MN 111 indicates the SCG status to the target MN 112 after executing CHO. The target MN 112 notifies the source MN 111 of the execution of handover with a HANDOVER SUCCESS message. The indication of the SCG status can be included, for example, in a response message to HANDOVER SUCCESS.

[0148] Example Implementation An example implementation of the above embodiment is provided below, showing the underlined additions to 3GPP TS 38.331 v15.4.1.

[0149] RRCReconfiguration The RRCReconfiguration message is a command to modify the RRC connection. It may carry information about measurement configuration, mobility control, radio resource configuration (including RB, MAC main configuration, physical channel configuration), and AS security configuration. Signaling radio bearer SRB1 or SRB3 RLC-SAP:AM Logical channel DCCH Direction: From network to UE120 RRCReconfiguration Message

[0150] [Table 6]

[0151] [Table 7]

[0152] Provided below is an example implementation of the above embodiment showing the underlined additions to 3GPP TS 38.423 v16.6.0.

[0153] RRCReconfigurationComplete ** An example of an S-NODE reconfiguration complete message is shown, including information about the current SCG state of the UE 120, forwarded in the same message to a T-SN, e.g., T-SN 112.

[0154] 9.1.2.4 S-NODE reconfiguration complete This message indicates whether the configuration requested by the S-NG-RAN node has been applied by the UE 120 or not. Or to provide the current SCG activation state of the UE 120. , is transmitted by an M-NG-RAN node, such as the MN 112, to an S-NG-RAN node, such as the SN 113. Direction: M-NG-RAN node → S-NG-RAN node

[0155] [Table 8]

[0156] An example of a new message named UE120 Configuration Update is shown that contains information about the current SCG state of the UE120.

[0157] 9.1.2.xxx UE configuration update This message is sent by a source NG-RAN node, such as source network node 111, to a target NG-RAN node, such as target network node 112 or 113, to provide an updated configuration of a UE, such as UE 120. Direction: Source NG-RAN node → Target NG-RAN node

[0158] [Table 9]

[0159] 17a and 17b show an example of a configuration in the UE 120 or the source MN 111. FIG.

[0160] The UE 120 or the source MN 111 may include, for example, an input / output interface 1700 configured to communicate with any of the network entities operating in the wireless communication network 100 of the present embodiment. The input / output interface 1700 may include, for example, a wired and / or wireless receiver (not shown) and, for example, a wired and / or wireless transmitter (not shown).

[0161] The UE 120 or the source MN 111 may include any one or more of an acquisition unit and a transmission unit that perform the method actions described herein, such as actions 1201 to 1204 above. These units are further described in the following exemplary embodiments.

[0162] The present embodiment may be implemented by a respective processor or one or more processors, such as at least one processor 1760 of the processing circuitry of the UE 120 or the source MN 111 shown in FIG. 17a, and computer program code for performing the functions and actions of the embodiments herein. The program code may also be provided as a computer program product, for example in the form of a data carrier carrying computer program code for performing the present embodiment when loaded into the UE 120 or the source MN 111. One form of such a carrier is a CD ROM. disk However, other data carriers such as a memory stick are also possible. The computer program code may also be provided as pure program code on a server and downloaded to the UE 120 or source MN 111.

[0163] The UE 120 or the source MN 111 may further include a memory 1770 including one or more memory units. The memory 1770 includes instructions executable by a processor in the UE 120 or the source MN 111. The memory 1770 is configured to be used to store instructions, data, configurations, and applications for performing methods of the present specification when executed in the UE 120 or the source MN 111, for example.

[0164] In some embodiments, the computer program 1780 includes instructions that, when executed by the at least one processor 1760, cause the at least one processor 1760 of the UE 120 or the source MN 111 to perform the actions described above.

[0165] In some embodiments, each carrier 1790 carries a respective computer program 1780, and carrier 1790 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

[0166] A person skilled in the art will also recognize that within 1It will be appreciated that the functional modules of may refer to one or more processors configured with a combination of analog and digital circuitry and / or software and / or firmware, for example, that may be stored in the UE 120 or the source MN 111 and that, when executed by one or more processors, such as the at least one processor 1760 described above, causes each of the at least one processor 1760 to perform an action according to any of the actions described above. One or more of these processors, and other digital hardware, may be included in a single application specific integrated circuit (ASIC), or multiple processors and various digital hardware may be distributed across various individual components, whether individually packaged or assembled into a system on a chip (SoC).

[0167] 18a and 18b show an example of a configuration in the first network node 111 or source MN 111. FIG.

[0168] The first network node 111 or the source MN 111 may, for example, comprise an input / output interface 1800 configured to communicate with any of the network entities operating in the wireless communication network 100 of the present embodiment. The input / output interface 1800 may, for example, comprise a wired and / or wireless receiver (not shown) and, for example, a wired and / or wireless transmitter (not shown).

[0169] The first network node 111 or the source MN 111 may include one or more of a configuration unit, a sending unit, and a triggering unit for performing the method actions described herein, such as the above actions 1301-1303. These units are further described in the following exemplary embodiments.

[0170] The present embodiment may be implemented by a respective processor or one or more processors, such as at least one processor 1860 of the processing circuitry of the first network node 111 or source MN 111 shown in Fig. 18a, and computer program code for performing the functions and actions of the embodiments herein. The program code may also be provided as a computer program product, for example in the form of a data carrier carrying computer program code for performing the present embodiment when loaded into the first network node 111 or source MN 111. One form of such a carrier is a CD ROM. disk However, other data carriers are possible, such as a memory stick. The computer program code may also be provided as pure program code on a server and downloaded to the first network node 111 or source MN 111.

[0171] The first network node 111 or source MN 111 may further comprise a memory 1870 including one or more memory units. The memory 1870 includes instructions executable by a processor in the first network node 111 or source MN 111. The memory 1870 is configured to be used to store instructions, data, configurations, and applications for performing methods herein when executed in the first network node 111 or source MN 111, for example.

[0172] In some embodiments, the computer program 1880 includes instructions that, when executed by the at least one processor 1860, cause the at least one processor 1860 of the first network node 111 or the source MN 111 to perform the actions described above.

[0173] In some embodiments, each carrier 1890 carries a respective computer program 1880, and carrier 1890 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

[0174] Those skilled in the art will also recognize that the first network node 111 or source MN 11 within 1 It will be appreciated that the functional modules of may refer to one or more processors configured with a combination of analog and digital circuitry and / or software and / or firmware, for example, software and / or firmware stored in the first network node 111 or the source MN 111 and that, when executed by one or more processors, such as the at least one processor 1860 described above, causes each of the at least one processor 1860 to perform an action according to any of the actions described above. One or more of these processors, and other digital hardware, may be included in a single application specific integrated circuit (ASIC), or multiple processors and various digital hardware may be distributed across various individual components, whether individually packaged or assembled into a system on a chip (SoC).

[0175] 19a and 19b show an example of a configuration in the second network node 112 or the target MN 112. FIG.

[0176] The second network node 112 or the target MN 112 may, for example, comprise an input / output interface 1900 configured to communicate with any of the network entities operating in the wireless communication network 100 of the present embodiment. The input / output interface 1900 may, for example, comprise a wired and / or wireless receiver (not shown) and, for example, a wired and / or wireless transmitter (not shown).

[0177] The second network node 112 or the target MN 112 may include one or more of a receiving unit, a reacting unit, a setting unit, an activating unit, and a deactivating unit, for example, performing the method actions described herein, such as the above action 1401. These units are further described in the following exemplary embodiments.

[0178] The present embodiment may be implemented by a respective processor or one or more processors, such as at least one processor 1960 of the processing circuitry of the second network node 112 or the target MN 112 shown in FIG. 19a, and computer program code for performing the functions and actions of the embodiments herein. The program code may also be provided as a computer program product, for example in the form of a data carrier carrying computer program code for performing the embodiments when loaded into the second network node 112 or the target MN 112. One form of such a carrier is a CD ROM. disk However, other data carriers are possible, such as a memory stick. The computer program code may also be provided as pure program code on a server and downloaded to the second network node 112 or the target MN 112.

[0179] The second network node 112 or target MN 112 may further comprise a memory 1970 including one or more memory units. The memory 1970 includes instructions executable by a processor in the second network node 112 or target MN 112. The memory 1970 is configured to be used to store, for example, instructions, data, configurations, and applications for performing methods herein when executed on the second network node 112 or target MN 112.

[0180] In some embodiments, the computer program 1980 includes instructions that, when executed by the at least one processor 1960, cause the at least one processor 1960 of the second network node 112 or the target MN 112 to perform the actions described above.

[0181] In some embodiments, each carrier 1990 carries a respective computer program 1980, and the carrier 1990 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

[0182] Those skilled in the art will also recognize that the second network node 112 or the target MN 11 within 2 It will be appreciated that the functional modules of may refer to one or more processors configured with a combination of analog and digital circuitry and / or software and / or firmware, for example, that may be stored in the second network node 112 or the target MN 112 and that, when executed by one or more processors, such as the at least one processor 1960 described above, causes each of the at least one processor 1960 to perform an action according to any of the actions described above. One or more of these processors, and other digital hardware, may be included in a single application specific integrated circuit (ASIC), or multiple processors and various digital hardware may be distributed across various individual components, whether individually packaged or assembled into a system on a chip (SoC).

[0183] 20a and 20b show an example of an arrangement in the third network node 113 or target SN 113.

[0184] The third network node 113 or the target SN 113 may, for example, comprise an input / output interface 2000 arranged to communicate with any of the network entities operating in the wireless communication network 100 of the present embodiment. The input / output interface 2000 may, for example, comprise a wired and / or wireless receiver (not shown) and, for example, a wired and / or wireless transmitter (not shown).

[0185] The third network node 113 or target SN 113 may include one or more of a receiving unit, a reacting unit, a setting unit, an activating unit and a deactivating unit, for example performing the method actions described herein, such as above action 1504. These units are further described in the following exemplary embodiments.

[0186] The present embodiments may be implemented by a respective processor or one or more processors, such as at least one processor 2060 of the processing circuitry of the third network node 113 or the target SN 113 shown in Figure 20a, and computer program code for performing the functions and actions of the embodiments herein. Said program code may also be provided as a computer program product, for example in the form of a data carrier carrying computer program code for performing the embodiments when loaded into the third network node 113 or the target SN 113. One form of such a carrier is a CD ROM. disk However, other data carriers are possible, such as a memory stick. The computer program code may also be provided as pure program code on a server and downloaded to the third network node 113 or the target SN 113.

[0187] The third network node 113 or target SN 113 may further comprise a memory 2070 including one or more memory units. The memory 2070 includes instructions executable by a processor in the third network node 113 or target SN 113. The memory 2070 is configured to be used to store instructions, data, configurations, and applications, for example, for performing methods herein when executed on the third network node 113 or target SN 113.

[0188] In some embodiments, the computer program 2080 comprises instructions that, when executed by the at least one processor 2060, cause the at least one processor 2060 of the third network node 113 or the target SN 113 to perform the actions described above.

[0189] In some embodiments, each carrier 2090 carries a respective computer program 2080, and carrier 2090 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

[0190] The skilled person will also be aware of the following third network node 113 or target SN 11 within 3 It will be appreciated that the functional modules of may refer to one or more processors configured with a combination of analog and digital circuitry and / or software and / or firmware, for example, that is stored in the third network node 113 or the target SN 113 and that, when executed by one or more processors, such as the at least one processor 2060 described above, causes each of the at least one processor 2060 to perform an action according to any of the actions described above. One or more of these processors, and other digital hardware, may be included in a single application specific integrated circuit (ASIC), or the multiple processors and various digital hardware may be distributed across various individual components, whether individually packaged or assembled into a system on a chip (SoC).

[0191] The embodiments herein are not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents can be used.

[0192] Below, several exemplary embodiments 1-22 are briefly described, see for example Figures 12, 13, 14, 15, 17a, 17b, 18a, 18b, 19a, 19b, 20a, and 20b.

[0193] Embodiment 1: A method performed by a user equipment (UE) 120, also referred to as a wireless device or wireless terminal, or, for example, a source MN 111, for indicating a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network 100, where the UE 120 is, for example, configured with a current SCG. Become The method may, for example, Obtaining a conditional handover (CHO) configuration for the UE 120 from a source MN 111, the CHO configuration including configurations for target candidate nodes 112, 113, the target candidate nodes 112, 113 including any one or more of a target candidate master node (MN) 112 and a target candidate secondary node (SN) 113; For example, a method including: sending an indication to a target candidate node 112, 113 indicating an SCG state set to one of SCG active and SCG inactive when a CHO execution condition associated with a CHO configuration is met.

[0194] Embodiment 2: A method as described in embodiment 1, wherein the SCG state is set according to any one of the current SCG state and / or the target SCG state.

[0195] Embodiment 3: The method according to embodiment 1 or 2, further comprising: obtaining, e.g., receiving, a current SCG state, meaning, for example, the SCG state that the UE 120 had when the CHO execution was initiated, e.g., for a source SN, which may be the same node as the target SN since the same PSCell / SCG is maintained in the HO, the current SCG state is set to one of either SCG active or SCG inactive; A method in which an indication to a target candidate node 112, 113 indicates the current SCG state, and the indication is initiated by a selected target candidate node 112, 113, including, for example, any one or more of the target candidate MN 112 and / or target candidate SN 113, to set the target SCG state to SCG active or SCG inactive.

[0196] This may mean, for example, setting the SCG state towards the target SN as part of the application of the CHO configuration in the SCG, and the UE 120 and the target network nodes 112, 113 acting accordingly.

[0197] Embodiment 4: The method according to embodiment 1 or 2, comprising: For example, the target SCG state can be - Always inactive and - Always active B and, For example, a value preconfigured by the source MN 111 as active or inactive; - by setting the SCG state to one of the latest SCG state that the UE 120 has when the CHO is executed, for example, the current SCG state; The indication to the target candidate nodes 112, 113 indicates the target SCG state.

[0198] Embodiment 5: A computer program comprising instructions that, when executed by a processor, cause the processor to perform the actions according to any one of embodiments 1 to 4.

[0199] Embodiment 6: A carrier comprising the computer program according to embodiment 5, The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal or a computer readable storage medium.

[0200] Embodiment 7: A method performed by a first network node 111 acting as a source master node (MN) 111 for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, the UE 120 being configured with, for example, a current SCG, the method comprising, for example: transmitting a conditional handover CHO configuration for the UE 120 to the UE 120, the CHO configuration including configurations for target candidate nodes 112, 113, the target candidate nodes 112, 113 including any one or more of a target candidate master node (MN) 112 and a target candidate secondary node (SN) 113; A method in which the CHO configuration triggers, for example, a UE 120, to send an indication to a target candidate node 112, 113 indicating an SCG state that is set to one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is met.

[0201] Embodiment 8: A method as described in embodiment 7, wherein the SCG state includes any one of a current SCG state and / or a target SCG state.

[0202] Embodiment 9: The method of embodiment 7 or 8, further comprising: transmitting to the UE 120 a current SCG state that is set to one of SCG active and SCG inactive; A method in which an indication to a target candidate node 112, 113 indicates the current SCG state, and the indication is initiated by a selected target candidate node 112, 113, including, for example, any one or more of the target candidate MN 112 and / or target candidate SN 113, to set the target SCG state to SCG active or SCG inactive.

[0203] Embodiment 10: The method of embodiment 7 or 8, comprising: - Always inactive and - Always active -preconfigured values ​​as active or inactive; - The latest SCG state that the UE 120 has when the CHO is executed; and configuring the UE 120 with a target SCG state set to one of The indication indicates a target SCG state.

[0204] Embodiment 11: A computer program comprising instructions that, when executed by a processor, cause the processor to perform the actions of any one of embodiments 7 to 10.

[0205] Embodiment 12: A carrier comprising the computer program according to embodiment 11, The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal or a computer readable storage medium.

[0206] Embodiment 13: A method performed by a second network node 112 acting as a target master node (MN) 112 for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, the UE 120 being configured with, for example, a current SCG, the method comprising, for example: A method comprising: receiving, from a UE 120, an indication indicating an SCG state set to one of SCG active and SCG inactive when a CHO execution condition associated with a CHO configuration is satisfied.

[0207] Embodiment 14: The method according to embodiment 13, comprising: A method, wherein the SCG state includes any one of a current SCG state and / or a target SCG state.

[0208] Embodiment 15: The method according to embodiment 13 or 14, further comprising: If the indication indicates a current SCG state, the method includes setting a target SCG state to SCG active or SCG inactive based on the indication.

[0209] Embodiment 16: The method according to embodiment 13 or 14, comprising: activating the SCG in response to the SCG after the CHO execution in response to a traffic evaluation after the CHO execution if the indication indicates a target SCG state including inactive; if the indication indicates a target SCG state including active, possibly deactivating the SCG in response to the SCG after the CHO execution in response to a traffic evaluation after the CHO execution; If the indication indicates a target SCG state including a preconfigured value as active or inactive, reactively deactivating the SCG after the CHO is performed in response to a traffic evaluation after the CHO is performed; A method comprising any one of the following steps:

[0210] Embodiment 17: A computer program comprising instructions that, when executed by a processor, cause the processor to perform the actions according to any one of embodiments 13 to 16.

[0211] Embodiment 18: A carrier comprising the computer program according to embodiment 17, The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal or a computer readable storage medium.

[0212] Embodiment 19: A method performed by a third network node 113 acting as a target secondary node (SN) 113 for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, the UE 120 being, for example, configured with a current SCG, the method comprising, for example: For example, a method including receiving an indication from UE 120 indicating an SCG state set to one of SCG active and SCG inactive when a CHO execution condition associated with a CHO configuration is satisfied.

[0213] Embodiment 20: The method of embodiment 19, comprising: A method, wherein the SCG state includes any one of a current SCG state and / or a target SCG state.

[0214] Embodiment 21: The method according to embodiment 19 or 20, further comprising: If the indication indicates a current SCG state, the method includes setting a target SCG state to SCG active or SCG inactive based on the indication.

[0215] Embodiment 22: The method according to embodiment 19 or 20, comprising: activating the SCG in response to the SCG after the CHO execution in response to a traffic evaluation after the CHO execution if the indication indicates a target SCG state including inactive; if the indication indicates a target SCG state including active, possibly deactivating the SCG in response to the SCG after the CHO execution in response to a traffic evaluation after the CHO execution; If the indication indicates a target SCG state including a preconfigured value as active or inactive, reactively deactivating the SCG after the CHO is performed in response to a traffic evaluation after the CHO is performed; A method comprising any one of the following steps:

[0216] Embodiment 23: A computer program comprising instructions that, when executed by a processor, cause the processor to perform the actions of any one of embodiments 19 to 22.

[0217] Embodiment 24: A carrier comprising the computer program according to embodiment 23, The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal or a computer readable storage medium.

[0218] Embodiment 25: A user equipment (UE) 120 or a source master node (MN) 111, also referred to as a wireless device or wireless terminal, configured to indicate a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network 100, the UE 120 or the source MN 111 being configured with, for example, a current SCG, the UE 120 or the source MN 111 being further configured with, for example: Acquiring a conditional handover (CHO) configuration of the UE 120 from the source MN 111 by means of an acquisition unit of the UE 120 or the source MN 111, the CHO configuration being adapted to include configurations of target candidate nodes 112, 113, the target candidate nodes 112, 113 being arranged to include any one or more of a target candidate master node (MN) 112 and a target candidate secondary node (SN) 113; transmitting, for example by means of a transmitting unit of the UE 120 or the source MN 111, an indication to the target candidate node 112, 113 adapted to indicate an SCG state set to one of SCG active and SCG inactive when, for example, a CHO execution condition related to the CHO configuration is adapted to be satisfied; The UE or source MN, further configured to:

[0219] Embodiment 26: The UE 120 or the source MN according to embodiment 26, The SCG state is adapted to be set according to either one of the current SCG state and / or the target SCG state, the UE or the source MN.

[0220] Embodiment 27: The UE 120 or the source MN 111 according to embodiment 25 or 26, for example, further comprising: Further configured to acquire, for example by means of an acquisition unit of the UE 120 or the source MN 111, a current SCG state adapted to be set to any one of SCG active and SCG inactive; An indication to the target candidate node 112, 113 is adapted to indicate the current SCG state, and the indication sets the target SCG state to SCG active or SCG inactive, and is initiated by the selected target candidate node 112, 113, including, for example, any one or more of the target candidate MN 112 and / or target candidate SN 113, either a UE or a source MN.

[0221] Embodiment 28: Embodiment 25 from 27 One of The UE 120 or the source MN 111 according to the embodiment 1, further comprising, for example, by means of an acquisition unit of the UE 120 or the source MN 111: -Always deactivate and -Always Activated and For example, a value preconfigured by the source MN 111 as activation or deactivation; The latest SCG state that the UE 120 has when the CHO is executed, e.g., the current SCG state; and further configured to obtain the value by setting the value to one of An indication to a target candidate node 112, 113, either the UE or the source MN, is adapted to indicate the target SCG status.

[0222] Embodiment 29: A first network node 111 operating as a source master node (MN) 111 configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, e.g., the UE 120 is configured to be configured in a current SCG, the first network node 111 further comprising, e.g. configured to transmit, by means of a transmitting unit of the first network node 111, a conditional handover (CHO) configuration of the UE 120, the CHO configuration being adapted to include configurations of target candidate nodes 112, 113, the target candidate nodes 112, 113 being configured to include any one or more of a target candidate master node (MN) 112 and a target candidate secondary node (SN) 113; For example, when a CHO execution condition associated with a CHO configuration is met, e.g. 、S An indication adapted to show the SCG status being set to one of CG active and SCG inactive. , for example by means of a transmitting unit of the first network node 111,To transmit to the target candidate nodes 112, 113, the CHO configuration is by means of a trigger unit of the first network node 111 A first network node adapted to trigger the UE 120.

[0223]

[0081] Embodiment 30: The first network node 111 according to embodiment 29, A first network node, wherein the SCG state is adapted to include any one of a current SCG state and / or a target SCG state.

[0224]

[0081] Embodiment 31: The first network node 111 according to any one of embodiments 29 to 30, further comprising: for example, First Network Node 111 by means of a transmission unit, configured to transmit to the UE 120 a current SCG state, the current SCG state being adapted to be set to one of SCG active and SCG inactive; An indication to the target candidate nodes 112, 113 is adapted to indicate the current SCG state, the indication setting the target SCG state to SCG active or SCG inactive, initiated by the selected target candidate nodes 112, 113, e.g., including any one or more of the target candidate MN 112 and / or target candidate SN 113, a first network node.

[0225]

[0081] Embodiment 32: The first network node 111 according to any one of embodiments 29 to 31, further comprising: For example, by means of a configuration unit of the first network node 111, -Always deactivate and -Always Activated and -preconfigured values ​​as active or inactive; -Configuring the UE 120 with a target SCG state set to one of the latest SCG state that the UE 120 has when the CHO is executed, and The indication indicates a target SCG state to the first network node.

[0226] Embodiment 33: A second network node 112 operating as a target master node (MN) 112 configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, the UE 120 being adapted to be configured with a current SCG, the second network node 112 further comprising: The second network node is further configured to, for example, receive, by means of a receiving unit of the second network node 112, an indication from the UE 120 adapted to indicate an SCG state being set to one of SCG active and SCG inactive when, for example, a CHO execution condition associated with the CHO configuration is adapted to be satisfied.

[0227]

[0081] Embodiment 34: The second network node 112 according to embodiment 33, A second network node, wherein the SCG state is adapted to include any one of a current SCG state and / or a target SCG state.

[0228]

[0081] Embodiment 35: The second network node 112 according to embodiment 33 or 34, further comprising: Indication shows current SCG status Adapted to your needs In this case, for example, the second network node 112 a second network node configured to set the target SCG state to SCG active or SCG inactive based on the indication by means of the setting unit.

[0229]

[0081] Embodiment 36: The second network node 112 according to any one of embodiments 33 to 35, further comprising: if the indication is adapted to indicate a target SCG state including inactive, reacting, e.g. by means of a reacting unit of the second network node 112, and activating, e.g. by means of an activation unit of the second network node 112, the SCG after the CHO in response to the post-CHO traffic evaluation; If the indication is adapted to indicate a target SCG state including active, reacting, e.g. by means of a reacting unit of the second network node 112, and deactivating the SCG after the CHO in response to the post-CHO traffic evaluation, e.g. by means of a deactivation unit of the second network node 112. Probably Deactivating it, if the indication is adapted to indicate a target SCG state comprising a preconfigured value as active or inactive, reacting, e.g. by means of a reacting unit of the second network node 112, and possibly deactivating the SCG after the CHO execution depending on the traffic evaluation after the CHO execution, e.g. by means of a deactivation unit of the second network node 112; a second network node configured to

[0230] Embodiment 37: A third network node 113 operating as a target secondary node (SN) 113 configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) 120 of a wireless communication network 100, the UE 120 being adapted to be configured with a current SCG, the third network node 113 further comprising: A third network node, further configured to, for example, receive, by means of a receiving unit of the third network node 113, an indication from the UE 120 adapted to indicate an SCG state being set to any one of SCG active and SCG inactive, when a CHO execution condition relating to the CHO configuration is adapted to be satisfied.

[0231]

[0081] Embodiment 38: The third network node according to embodiment 37, A third network node, wherein an SCG state is adapted to include any one of the current SCG state and / or a target SCG state.

[0232]

[0081] Embodiment 39: The third network node 113 according to embodiment 37 or 38, further comprising: a third network node configured, if the indication indicates a current SCG state, to set the target SCG state to SCG active or SCG inactive based on the indication, for example by means of a setting unit of the third network node.

[0233]

[0081] Embodiment 40: The third network node 113 according to any one of embodiments 37 to 39, further comprising: if the indication is adapted to indicate a target SCG state including inactive, reacting, e.g. by means of a reacting unit of the third network node 113, and activating, e.g. by means of an activation unit of the third network node 113, the SCG after the CHO in response to the post-CHO traffic evaluation; Indication ,a reacting, e.g. by means of a reacting unit of the third network node 113, if the third network node is adapted to indicate a target SCG state including an active state, and deactivating the SCG after the CHO, e.g. by means of a deactivation unit of the third network node 113, in response to the post-CHO traffic evaluation; if the indication is adapted to indicate a target SCG state comprising a preconfigured value as active or inactive, reacting, e.g. by means of a reacting unit of the third network node 113, and possibly deactivating the SCG after the CHO execution depending on the post-CHO traffic evaluation, e.g. by means of a deactivation unit of the third network node 113; a third network node configured to

[0234] Abbreviation Description 5GC or 5GCN 5G Core Network ACK positive confirmation AGC Automatic Gain Control AMF Access and Mobility Management Functions AP Application Protocol BSR Buffer Status Report BWP Bandwidth Part C-RNTI Cell Radio Network Temporary Identifier CA Career a Aggregation CE Control Element CHO Conditional Handover CN Core Network CPA conditional PSCell addition CPC Conditional PSCell Change CP Control Plane CQI Channel Quality Information C-RNTI Cell Radio Network Temporary Identifier CSI Channel State Information DC Dual Connection DCI Downlink Control Information DL Downlink DRB Data Radio Bearer eNB (EUTRAN) base station E-RAB EUTRAN Radio Access Bearer E-UTRA Evolved Universal Terrestrial Radio Access E-UTRAN Evolved Universal Terrestrial Radio Access Network FDD Frequency Division Duplex gNB NR base station GTP-U GPRS Tunneling Protocol - User Plane IE Information Elements IP Internet Protocol LTE Long Term Evolution MCG Master Cell Group MAC Media Access Control MAC CE MAC Control element MeNB Master eNB MgNB Master gNB MN Master Node MR-DC Multi-radio dual connection NACK Negative Acknowledgement NAS Non-Access Stratum NG-RAN Next Generation Radio Access Network Ng-eNB Next generation evolved Node B NR New Radio PDCP Packet Data Convergence Protocol PCell Primary Cell PCI Physical Cell Identifier PDCCH Physical Downlink Control Channel PHR Power Headroom Report PSCell (LTE) Primary Secondary Cell or (NR) Primary SCG Cell PUCCH Physical Uplink Control Channel PUSCH Physical uplink shared channel RACH Random Access Channel RAT Radio Access Technology RB Radio Bearer RLC Radio Link Control RLF Radio Link Failure RRC Radio Resource Control SCell Secondary Cell SCG Secondary Cell Group SCTP Stream Control Transmission Protocol SeNB Secondary eNB SgNB Secondary gNB SINR Signal to Interference and Noise Ratio SN Secondary Node SR Scheduling Request SRB Signaling Radio Bearer S-SN Source Secondary Node SUL Auxiliary Uplink SpCell Master or primary cell of a secondary cell group , Special Cell TAT Timing Alignment Timer TDD time division duplex TEID Tunnel End Point Identifier TNL Transport Network Layer T-SN Target Secondary Node

[0235] Further expansion and variations 21 according to one embodiment, a communication system includes a communication network 3210 such as a wireless communication network 100, such as a 3GPP type cellular network, including an access network 3211, such as an IoT network, WLAN, radio access network, and a core network 3214. The access network 3211 includes a number of base stations 3212a, 3212b, 3212c, such as first, second and third network nodes 111, 112, 113, access nodes, AP STA NBs, eNBs, gNBs, or other types of wireless access points, each defining a corresponding coverage area 3213a, 3213b, 3213c. Each base station 3212a, 3212b, 3212c can be connected to the core network 3214 via a wired or wireless connection 3215. A first UE, for example a non-AP located in the coverage area 3213c, A UE 120, such as a STA 3291, is configured to wirelessly connect to or be paged by a corresponding base station 3212c. A second UE 3292, such as a non-AP STA UE 120 located in the coverage area 3213a, can wirelessly connect to the corresponding base station 3212a. Although multiple UEs 3291, 3292 are shown in this example, the disclosed embodiments are equally applicable to situations where a single UE is in the coverage area or connected to the corresponding base station 3212.

[0236] The communication network 3210 is itself connected to a host computer 3230, which may be embodied by hardware and / or software of a standalone server, a cloud-implemented server, a distributed server, or as a processing resource of a server farm. The host computer 3230 may be under the ownership or control of a service provider, or may be operated by or on behalf of the service provider. The connection 3221, 3222 between the communication network 3210 and the host computer 3230 may extend directly from the core network 3214 to the host computer 3230, or may go through an optional intermediate network 3220. The intermediate network 3220 may be one or a combination of two or more of a public, private, or hosted network, and the intermediate network 3220 (if present) may be a backbone network or the Internet, and in particular the intermediate network 3220 may comprise two or more sub-networks (not shown).

[0237] The communication system of FIG. 21 as a whole enables a connection between one of the connected UEs 3291, 3292 and the host computer 3230. The connectivity may be described as an over-the-top (OTT) connection 3250. The host computer 3230 and the connected UEs 3291, 3292 are configured to communicate data and / or signaling via the OTT connection 3250 using the access network 3211, the core network 3214, any intermediate networks 3220, and possible further infrastructure (not shown) as intermediaries. The OTT connection 3250 may be transparent in the sense that the participating communication devices through which the OTT connection 3250 passes are unaware of the routing of the uplink and downlink communications. For example, the base station 3212 is not, or does not need to be, informed of the past routing of incoming downlink communications with data originating from the host computer 3230 being forwarded (e.g., handed over) to the connected UE 3291. Similarly, the base station 3212 does not need to be aware of the future routing of outgoing uplink communications from the UE 3291 towards the host computer 3230.

[0238] An exemplary implementation of the UE, base station, and host computer described in the preceding paragraphs according to one embodiment is described with reference to FIG. 22. In the communication system 3300, the host computer 3310 comprises hardware 3315 including a communication interface 3316 configured to set up and maintain wired or wireless connections with interfaces of different communication devices of the communication system 3300. The host computer 3310 further comprises a processing circuit 3318 that may have memory and / or processing capabilities. In particular, the processing circuit 3318 may comprise one or more programmable processors, application specific integrated circuits, field programmable gate arrays, or combinations thereof (not shown) adapted to execute instructions. The host computer 3310 further comprises software 3311, which is stored in or accessible by the host computer 3310 and executable by the processing circuit 3318. The software 3311 includes a host application 3312. The host application 3312 may be operable to provide services to a remote user, such as the UE 3330, that connects with the UE 3330 via an OTT connection 3350 terminated at the host computer 3310. In providing services to the remote user, the host application 3312 may provide user data that is transmitted using the OTT connection 3350.

[0239] The communication system 3300 further includes a base station 3320 provided in the communication system and equipped with hardware 3325 enabling communication with the host computer 3310 and the UE 3330. The hardware 3325 may include a communication interface 3326 for setting up and maintaining wired or wireless connections with interfaces of different communication devices of the communication system 3300, and a wireless interface 3327 for setting up and maintaining at least a wireless connection 3370 with the UE 3330 in a coverage area (not shown) served by the base station 3320. The communication interface 3326 may be configured to facilitate a connection 3360 to the host computer 3310. The connection 3360 may be direct or may pass through a core network (not shown in FIG. 22) of the communication system and / or one or more intermediate networks external to the communication system. In an embodiment, the hardware 3325 of the base station 3320 further comprises a processing circuit 3328, which may comprise one or more programmable processors, application specific integrated circuits, field programmable gate arrays, or combinations thereof (not shown) adapted to execute instructions. The base station 3320 further comprises software 3321 stored therein or software 33211 accessible via an external connection.

[0240] The communication system 3300 further includes the UE 3330 already mentioned. Its hardware 3335 may include a wireless interface 3337 configured to set up and maintain a wireless connection 3370 with a base station serving the coverage area in which the UE 3330 is currently located. The hardware 3335 of the UE 3330 further includes a processing circuit 3338, which may include one or more programmable processors, application specific integrated circuits, field programmable gate arrays, or combinations thereof (not shown) adapted to execute instructions. The UE 3330 further includes software 3331, which software 3311 is stored in or accessible by the UE 3330 and executable by the processing circuit 3338. The software 3331 may include: client The host computer 3310 includes a client application 3332. The client application 3332 may be operable to provide services to a human or non-human user via the UE 3330 with support from the host computer 3310. In the host computer 3310, the running host application 3312 may communicate with the running client application 3332 via the UE 3330 and an OTT connection 3350 that terminates at the host computer 3310. In providing services to the user, the client application 3332 may receive request data from the host application 3312 and provide user data in response to the request data. The OTT connection 3350 may transfer both the request data and the user data. The client application 3332 may interact with the user and generate user data to provide.

[0241] It should be noted that the host computer 3310, base station 3320, and UE 3330 shown in Fig. 22 may be the same as the host computer 3230, one of the base stations 3212a, 3212b, and 3212c, and one of the UEs 3291 and 3292, respectively, in Fig. 21. That is, the internal operation of these entities may be as shown in Fig. 22, and independently, the surrounding network topology may be as shown in Fig. 21.

[0242] 22, the OTT connection 3350 is depicted abstractly to show communication between the host computer 3310 and the wireless device 3330 via the base station 3320, without explicit reference to intermediate devices and the exact routing of messages through those devices. The network infrastructure may determine the routing, which may be configured to be hidden from the UE 3330 or the service provider operating the host computer 3310, or both. While the OTT connection 3350 is active, the network infrastructure may further decide to dynamically change the routing (e.g., based on network load balancing considerations or reconfiguration).

[0243] The wireless connection 3370 between the UE 3330 and the base station 3320 follows the teachings of the embodiments described throughout this disclosure. One or more various embodiments improve the performance of the OTT service provided to the UE 3330 using the OTT connection 3350 of which the wireless connection 3370 forms the last segment. More precisely, the teachings of these embodiments can improve applicable RAN effects, i.e. data rate, latency, power consumption, thereby providing corresponding benefits to the OTT service, such as reduced user latency, relaxed file size limitations, better responsiveness, extended battery life, etc.

[0244] Measurement procedures may be provided for the purpose of monitoring data rates, latency, and other factors for which one or more embodiments may be improved. Additionally, there may be optional network functionality to reconfigure the OTT connection 3350 between the host computer 3310 and the UE 3330 in response to variations in the measurement results. The measurement procedures and / or network functionality to reconfigure the OTT connection 3350 may be implemented in the software 3311 of the host computer 3310 or the software 3331 of the UE 3330, or both. In an embodiment, a sensor (not shown) is located in or associated with the communication device through which the OTT connection 3350 passes, and the sensor may participate in the measurement procedure by providing values ​​of the monitored quantities exemplified above, or by providing values ​​of other physical quantities from which the software 3311, 3331 may calculate or estimate the monitored quantities. Reconfiguration of the OTT connection 3350 may include message formats, retransmission settings, priority routing, etc., and the reconfiguration does not impact the base station 3320 and may be unknown or imperceptible to the base station 3320. Such procedures and functionality may be known and practiced in the art. In certain embodiments, the measurements may include proprietary UE signaling to facilitate host computer 3310 measurements of throughput, propagation time, latency, etc. The measurements may be implemented by software 3311, 33 31 may be implemented to use the OTT connection 3350 to send messages, particularly empty or "dummy" messages, while monitoring propagation times, errors, etc.

[0245] FIG. 23 is a flow chart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station, such as the first to third network nodes 111 to 113, and a UE, such as the UE 120, which may be as described with reference to FIGS. 21 and 22. To simplify the disclosure, only the reference drawing to FIG. 23 is included in this section. In a first action 3410 of the method, the host computer provides user data. In an optional sub-action 3411 of the first action 3410, the host computer provides the user data by executing a host application. In a second action 3420, the host computer initiates a transmission carrying the user data to the UE. In an optional third action 3430, the base station transmits the user data carried in the host computer initiated transmission to the UE according to the teachings of the embodiments described throughout this disclosure. In an optional fourth action 3440, the UE executes a client application associated with the host application executed by the host computer.

[0246] FIG. 24 is a flow chart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station such as an AP STA, and a UE such as a non-AP STA, which may be as described with reference to FIGS. 21 and 22. To simplify the disclosure, only the reference drawing to FIG. 24 is included in this section. In a first action 3510 of the method, the host computer provides user data. In an optional sub-action (not shown), the host computer provides the user data by executing a host application. In a second action 3520, the host computer initiates a transmission carrying the user data to the UE. The transmission may be routed through a base station according to the teachings of the embodiments described throughout this disclosure. In an optional third action 3530, the UE receives the user data carried in the transmission.

[0247] FIG. 25 is a flow chart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station such as an AP STA, and a UE such as a non-AP STA, which may be as described with reference to FIGS. 21 and 22. To simplify the disclosure, only a reference drawing to FIG. 25 is included in this section. In an optional first action 3610 of the method, the UE receives input data provided by the host computer. Additionally or alternatively, in an optional second action 3620, the UE provides user data. In an optional sub-action 3621 of the second action 3620, the UE clientIn a further optional sub-action 3611 of the first action 3610, the UE executes a client application that provides the user data in response to the received input data provided by the host computer. In providing the user data, the executed client application may further take into account user input received from the user. Regardless of the particular manner in which the user data was provided, the UE in an optional third sub-action 3630 initiates transmission of the user data to the host computer. In a fourth action 3640 of the method, the host computer receives the user data transmitted from the UE in accordance with the teachings of the embodiments described throughout this disclosure.

[0248] FIG. 26 is a flow chart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station such as an AP STA, and a UE such as a non-AP STA, which may be as described with reference to FIG. 21 and FIG. 22. To simplify the disclosure, only the reference drawing to FIG. 26 is included in this section. In an optional first action 3710 of the method, the base station receives user data from the UE according to the teachings of the embodiments described throughout this disclosure. In an optional second action 3720, the base station initiates transmission of the received user data to the host computer. In a third action 3730, the host computer receives the user data carried in the transmission initiated by the base station.

Claims

1. A method performed by a user equipment (UE) (120) or a source master node (MN) (111) for indicating a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network (100), the UE (120) being configured with a current SCG, the method comprising: Obtaining (1201) a CHO configuration of the UE (120) from a source MN (111), the CHO configuration including configurations of target candidate nodes (112, 113), the target candidate nodes (112, 113) including any one or more of a target candidate MN (112) and a target candidate secondary node (SN) (113); sending (1204) an indication to the target candidate node (112, 113) that an SCG state is set to one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is satisfied; The method includes:

2. 2. The method of claim 1 , A method according to claim 1, wherein the SCG state is set according to any one of the current SCG state and / or a target SCG state.

3. The method according to claim 1 or 2, further comprising: obtaining (1202) the current SCG state, which is set to one of SCG active and SCG inactive; The indication to the target candidate node (112, 113) indicates the current SCG state, and the indication sets the target SCG state to SCG active or SCG inactive and is initiated by the selected target candidate node (112, 113).

4. 3. The method according to claim 1 or 2, - Always inactive, - Always active - preconfigured values ​​as active or inactive; - the latest SCG state that the UE (120) had when the CHO was performed; obtain a target SCG state (1203), which is one of The indication to the target candidate node (112, 113) indicates the target SCG state.

5. A computer program (1780) comprising instructions that, when executed by a processor (1760), cause the processor (1760) to perform the actions recited in any one of claims 1 to 4.

6. A carrier (1790) containing the computer program (1780) according to claim 5, The carrier (1790) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

7. A method performed by a first network node (111) acting as a source master node (MN) (111) for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being configured with a current SCG, the method comprising: transmitting (1301) a conditional handover (CHO) configuration of the UE (120) to the UE (120), the CHO configuration including configurations of target candidate nodes (112, 113), the target candidate nodes (112, 113) including any one or more of a target candidate master node (MN) (112) and a target candidate secondary node (SN) (113); The method, wherein the CHO configuration triggers the UE (120) to send an indication to the target candidate node (112, 113) indicating an SCG state set to one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is met.

8. 8. The method of claim 7, A method, wherein the SCG state includes any one of the current SCG state and / or a target SCG state.

9. 9. The method of claim 7 or 8, further comprising: transmitting (1302) a current SCG state to the UE (120), the current SCG state being set to one of an SCG active and an SCG inactive; The indication to the target candidate node (112, 113) indicates the current SCG state, and the indication sets the target SCG state to SCG active or SCG inactive and is initiated by the selected target candidate node (112, 113).

10. 9. The method of claim 7 or 8, further comprising: - Always inactive, - Always active, - preconfigured values ​​as active or inactive; - the latest SCG state that the UE (120) had when the CHO was performed; and configuring (1303) the UE (120) with a target SCG state set to any one of the following: The indication indicates the target SCG state.

11. A computer program (1880) comprising instructions that, when executed on a processor (1860), cause the processor (1860) to perform the actions set forth in any one of claims 7 to 10.

12. A carrier (1890) comprising the computer program (1880) according to claim 11, The carrier (1890) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

13. 1. A method performed by a second network node (112) acting as a target master node (MN) (112) for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being configured with a current SCG, the method comprising: A method comprising: receiving (1401) from the UE (120) an indication indicating an SCG state being set to one of SCG active and SCG inactive when a CHO execution condition associated with a CHO configuration is satisfied.

14. 14. The method of claim 13, A method, wherein the SCG state includes any one of the current SCG state and / or a target SCG state.

15. 15. The method of claim 13 or 14, further comprising: If the indication indicates a current SCG state, setting a target SCG state to SCG active or SCG inactive based on the indication.

16. 15. The method of claim 13 or 14, further comprising: activating the SCG in response to a post-CHO execution traffic evaluation if the indication indicates a target SCG state including inactive; and if the indication indicates a target SCG state including active, possibly deactivating the SCG after CHO execution in response to a post-CHO traffic evaluation; if the indication indicates a target SCG state including a preconfigured value as active or inactive, possibly deactivating the SCG in response to a traffic evaluation after the CHO execution; A method comprising any one of the following:

17. A computer program (1980) comprising instructions which, when executed on a processor (1960), cause the processor (1960) to perform the actions recited in any one of claims 13 to 16.

18. A carrier (1990) comprising the computer program (1980) according to claim 17, The carrier (1990) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer readable storage medium.

19. A method performed by a third network node (113) acting as a target secondary node (SN) (113) for handling a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being configured with a current SCG, the method comprising: The method includes receiving (1504) an indication from the UE (120) indicating an SCG state being set to one of SCG active and SCG inactive when a CHO execution condition associated with a CHO configuration is satisfied.

20. 20. The method of claim 19, A method, wherein the SCG state includes any one of the current SCG state and / or a target SCG state.

21. 21. The method of claim 19 or 20, further comprising: If the indication indicates a current SCG state, setting a target SCG state to SCG active or SCG inactive based on the indication.

22. 21. The method of claim 19 or 20, further comprising: activating the SCG in response to a post-CHO execution traffic evaluation if the indication indicates a target SCG state including inactive; and if the indication indicates a target SCG state including active, possibly deactivating the SCG after CHO execution in response to a post-CHO traffic evaluation; if the indication indicates a target SCG state including a preconfigured value as active or inactive, possibly deactivating the SCG in response to a traffic evaluation after the CHO execution; A method comprising any one of the following:

23. A computer program (2080) comprising instructions which, when executed on a processor (2060), cause the processor (2060) to perform the actions of any one of claims 19 to 22.

24. A carrier (2090) comprising a computer program (2080) according to claim 23, The carrier (2090) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal or a computer readable storage medium.

25. A user equipment (UE) (120) or a source master node (MN) (111) configured to indicate a secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network (100), the UE (120) or the source MN (111) being configured with a current SCG, the UE (120) or the source MN (111) further comprising: obtaining a CHO configuration for the UE (120) from a source MN (111), the CHO configuration being adapted to include configurations of target candidate nodes (112, 113), the target candidate nodes (112, 113) being configured to include any one or more of a target candidate MN (112) and a target candidate secondary node (SN) (113); sending an indication to the target candidate node (112, 113) adapted to indicate an SCG state set to one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is adapted to be satisfied; The UE or source MN is configured to perform the following:

26. 27. A UE (120) or a source (MN) according to claim 26, The SCG state is adapted to be set according to any one of the current SCG state and / or a target SCG state, UE or source MN.

27. 27. The UE (120) or source (MN) of claim 25 or 26, further comprising: configured to obtain the current SCG state adapted to be set to one of an SCG active and an SCG inactive; The indication to the target candidate node (112, 113) is adapted to indicate the current SCG state, and the indication sets the target SCG state to SCG active or SCG inactive and is initiated by the selected target candidate node (112, 113), either UE or source MN.

28. The UE (120) or source (MN) according to any one of claims 25 to 27, further comprising: - Always inactive, - Always active, - preconfigured values ​​as active or inactive; - the latest SCG state that the UE (120) had when the CHO was performed; to obtain a target SCG state conforming to any one of The indication to the target candidate node (112, 113), UE or source MN, is adapted to indicate the target SCG status.

29. A first network node (111) acting as a source master node (MN) (111) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being configured with a current SCG, the first network node (111) comprising: a conditional handover (CHO) configuration of the UE (120) is transmitted to the UE (120), the CHO configuration being adapted to include configurations of target candidate nodes (112, 113), the target candidate nodes (112, 113) being configured to include any one or more of a target candidate master node (MN) (112) and a target candidate secondary node (SN) (113); A first network node, wherein the CHO configuration is adapted to trigger the UE (120) to send an indication to the target candidate node (112, 113) adapted to indicate an SCG state set to any one of SCG active and SCG inactive when a CHO execution condition associated with the CHO configuration is adapted to be satisfied.

30. A first network node (111) according to claim 29, comprising: A first network node, wherein the SCG state is adapted to include any one of the current SCG state and / or a target SCG state.

31. A first network node (111) according to any one of claims 29 to 30, further comprising: configured to transmit to the UE (120) a current SCG state adapted to be set to one of an SCG active and an SCG inactive; A first network node, wherein the indication to the target candidate node (112, 113) is adapted to indicate the current SCG state, and the indication sets the target SCG state to SCG active or SCG inactive and is initiated by the selected target candidate node (112, 113).

32. A first network node (111) according to any one of claims 29 to 31, further comprising: - Always inactive, - Always active, - preconfigured values ​​as active or inactive; - the latest SCG state that the UE (120) had when the CHO was performed; and configuring (1303) the UE (120) in a target SCG state adapted to be one of: The indication indicates the target SCG state.

33. A second network node (112) operating as a target master node (MN) (112) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being adapted to be configured with a current SCG, the second network node (112) further comprising: A second network node configured to receive an indication from the UE (120) adapted to indicate an SCG state being set to one of SCG active and SCG inactive when a CHO execution condition related to a CHO configuration is satisfied.

34. A second network node (112) according to claim 33, comprising: A second network node, wherein the SCG state is adapted to include any one of the current SCG state and / or a target SCG state.

35. A second network node (112) according to claim 33 or 34, further comprising: A second network node configured to, if the indication is adapted to indicate a current SCG state, set a target SCG state to SCG active or SCG inactive based on the indication.

36. A second network node (112) according to any one of claims 33 to 35, further comprising: activating the SCG in response to a post-CHO execution traffic evaluation if the indication is adapted to indicate a target SCG state including inactive; and if the indication is adapted to indicate a target SCG state including active, possibly deactivating the SCG after CHO execution in response to a traffic evaluation after CHO execution; If the indication is adapted to indicate a target SCG status including a preconfigured value as active or inactive, possibly deactivating the SCG in response to a traffic evaluation after the CHO execution; a second network node configured to:

37. a third network node (113) acting as a target secondary node (SN) (113) configured to handle a secondary cell group (SCG) state during a conditional handover (CHO) for a user equipment (UE) (120) of a wireless communication network (100), the UE (120) being adapted to be configured with a current SCG, the third network node (113) further comprising: A third network node configured to receive an indication from the UE (120) adapted to indicate an SCG state being set to one of SCG active and SCG inactive when a CHO execution condition related to the CHO configuration is satisfied.

38. A third network node (113) according to claim 37, comprising: A third network node, wherein the SCG state is adapted to include any one of the current SCG state and / or a target SCG state.

39. A third network node (113) according to claim 37 or 38, further comprising: A third network node configured to, if the indication is adapted to indicate a current SCG state, set a target SCG state to SCG active or SCG inactive based on the indication.

40. A third network node (113) according to any one of claims 37 to 39, further comprising: activating the SCG in response to a post-CHO execution traffic evaluation if the indication is adapted to indicate a target SCG state including inactive; and if the indication is adapted to indicate a target SCG state including active, possibly deactivating the SCG after CHO execution in response to a traffic evaluation after CHO execution; If the indication is adapted to indicate a target SCG status including a preconfigured value as active or inactive, possibly deactivating the SCG in response to a traffic evaluation after the CHO execution; a third network node configured to perform any one of the following:

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