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

Abstract

This invention provides a method for indicating the secondary cell group (SCG) status during a conditional handover (CHO) in a wireless communication network. [Solution] A method performed by a user device (UE) or source master node (MN) to obtain the CHO configuration of the UE, which is currently configured with an SCG, from the source MN (1201). The CHO configuration includes the configuration of a target candidate node. The target candidate node includes any one or more of the target candidate MN and the target candidate secondary next node (SN). The method also sends an indication to the target candidate node when the CHO execution conditions related to the CHO configuration are met (1204). The indication shows an SCG state, which is set to either SCG active or SCG inactive.

Description

[Technical Field]

[0001] Embodiments of this specification relate to a user device (UE) or source master node (MN), a first network node, a second network node, a third network node, and methods relating thereto. In some embodiments, they relate to displaying and / or processing secondary cell group (SCG) status during a conditional handover (CHO) of a UE in a wireless communication network.

[0002] Embodiments of this specification further relate to computer programs and carriers corresponding to the above-described methods, UEs, and network nodes. [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 (UEs), communicate over local area networks such as WiFi networks or cellular networks, which include a radio access network (RAN) part and a core network (CN) part, or wide area networks (WANs). A RAN covers a geographical area that can be divided into service areas or cell areas, which may also be referred to as beams or beam groups. Each service area or cell area is serviced by wireless network nodes, such as wireless access nodes, which are, for example, Wi-Fi access points or radio base stations (RBS). In some networks, radio base stations may also be referred to as, for example, node B, e-node B (eNB), or gNB in ​​fifth-generation (5G) communications. A service area or cell area is a geographical area where radio coverage is provided by wireless network nodes. Wireless network nodes communicate with wireless devices within their range via air interfaces operating on radio frequencies.

[0004] 3GPP (Registered Trademark) is a standardization organization that specifies standards for the development of cellular systems, including 3G, 4G, 5G, and future evolutions. The specifications for the Evolved Packet System (EPS), also known as the 4th generation (4G) network, were completed within the 3rd Generation Partnership Project (3GPP (Registered Trademark)). As a continuous network evolution, the new releases of 3GPP (Registered Trademark) specify the 5G network, also called 5G New Radio (NR).

[0005] The frequency bands of 5G NR are divided into two different frequency ranges: Frequency Range 1 (FR1) and Frequency Range 2 (FR2). FR1 includes frequency bands below 6 GHz. Some of these bands are those that have been used in conventional standards but are extended to cover potential new spectra from 410 MHz to 7125 MHz. FR2 includes frequency bands from 24.25 GHz to 52.6 GHz. The bands in this millimeter-wave range have a shorter communication range than the bands of FR1 but a wider available bandwidth.

[0006] Multi-antenna technology can significantly increase the data rate and reliability of wireless communication systems. In the case of a wireless connection between a single user, such as a UE, and a base station, when both the transmitter and the receiver are equipped with multiple antennas, the performance is particularly improved, resulting in a Multiple-Input Multiple-Output (MIMO) communication channel being realized. This can be referred to as Single-User (SU)-MIMO. In a scenario where MIMO technology is used for wireless connections between multiple users and a base station, MIMO enables users to communicate with the base station simultaneously using the same time-frequency resources by spatially separating the users, further increasing the cell capacity. This can be referred to as Multi-User (MU)-MIMO. Note that MU-MIMO can have advantages when each UE has only one antenna. Such systems and / or related technologies are usually referred to as MIMO.

[0007] 3GPP(registered trademark) dual connectivity In 3GPP (registered trademark) Release 12, dual connectivity (DC) of LTE functions was introduced, enabling the UE to connect to two cell groups, each controlled by an eNB, an LTE access node called the master eNB (MeNB) and the secondary eNB (SeNB). The UE still has only one radio resource control (RRC) connection to the network. In 3GPP (registered trademark), the dual connectivity (DC) solution has since evolved and is now also specified between NR and between LTE and NR. Multi-connection (MC) is the case where more than three nodes are involved. With the introduction of 5G, the term multi-radio dual connectivity (MR-DC) (see also 3GPP (registered trademark) TS37.340) was defined as a general term for all dual connectivity options that include at least one NR access node. Using the generalized term for 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 a dual connection is configured for the UE, carrier aggregation can also be used in each of the two cell groups of the MCG and SCG. In this case, within the master cell group (MCG) controlled by the master node (MN), the UE can use one primary cell (Pcell) and one or more secondary cells (SCells). And within the secondary cell group (SCG) controlled by the secondary node (SN), the UE can use one primary SCell (PSCell) (also known as the primary SCG cell in NR) and one or more SCells. This combination case is shown in Figure 1, which shows a dual connection combined with carrier aggregation in MR-DC. In NR, the primary cell of the master cell group or the secondary cell group is also called the special cell (SpCell). Therefore, the SpCell within the MCG is the PCell, and the SpCell within the SCG is the PSCell.

[0009] There are various ways to deploy a 5G network, with or without interaction with LTE, also known as Advanced General-Purpose Terrestrial Radio Access (E-UTRA) and Advanced Packet Core (EPC). In principle, NR and LTE can be deployed without interworking, also known as Option 2, in a configuration called NR Standalone (SA) operation. That is, the NR gNB can be connected to the 5G core network (5GC), the LTE eNB can be connected to the EPC, and there is no interconnection between the two, also known as Option 1.

[0010] On the other hand, the first supported version of NR, as shown in Figure 2, also known as Option 3, uses a dual connection called E-UTRAN-NR Dual Connection (EN-DC). In this configuration, a dual connection is applied between NR and LTE, with the UE connected to the LTE access node via the LTE radio interface (LTE Uu in the figure) and to the NR access node via the NR radio interface (NR Uu in the figure). Furthermore, in EN-DC, the LTE access node acts as the master node, in this case known as the master eNB (MeNB) that controls the MCG, and the NR access node acts as the secondary node, in this case known as the secondary gNB (SgNB) that controls the secondary cell group (SCG). In this case, the SgNB, which is NR, may not have a control plane connection to the core network (EPC), which is provided instead by the MeNB. This is also called "non-standalone NR," or "NSA NR" for short. In this case, the functionality of the NR cells is limited and they will be used as boosters and / or diversity legs for connected mode UEs, but note that UEs in RRC_IDLE mode cannot camp in these NR cells.

[0011] The introduction of 5GC may enable other options. As mentioned earlier, Option 2 supports a standalone NR configuration in which a gNB connects to a 5GC. Similarly, LTE can also connect to a 5GC using Option 5, also known as eLTE, E-UTRA / 5GC, or LTE / 5GC, where the node may also be called an ng-eNB. In these cases, both NR and LTE are considered part of the NG-RAN, and both ng-eNBs and gNBs may be referred to as NG-RAN nodes.

[0012] Notably, other variations of dual connectivity between LTE and NR exist, which were standardized as part of NG-RAN connected to 5GC. Under the umbrella of MR-DC are the following: • 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 (Variation 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 NRs, and a dual connection using 5GCN.

[0013] Because the transition to these options may vary by operator, it is possible to deploy multiple options in parallel within the same network. For example, an eNB base station supporting options 3, 5, and 7 may exist on the same network as an NR base station supporting options 2 and 4. Combined with a 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 in 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 earlier, DC is standardized in both LTE and E-UTRA-NR DC (EN-DC).

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

[0016] Figure 4 shows a schematic of the control plane architectures 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's knowledge, but often the SN needs to coordinate with the MN. In LTE-DC, RRC decisions are always made by the MN (from MN to UE). However, it should be noted that only the SN itself knows what kind of resources, capabilities, etc., it still determines the configuration of the SN.

[0017] For EN-DC and NR-DC, the main changes compared to LTE DC are as follows: • Introduction of split bearers from SN (referred to as SCG split bearers) • Introduction of RRC's split bearer • Direct introduction of 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 a network perspective. In this case, the network can configure either the E-UTRA Packet Data Convergence Protocol (PDCP) or NR PDCP for the MN-terminated MCG bearer, but NR PDCP is always used for all other bearers.

[0019] Figure 6 shows the user plane protocol architecture of MR-DC (NGEN-DC, NE-DC, and NR-DC) with 5GC from a 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) / Media 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 enhance robustness during handover (HO). The possibility of providing RRC signaling for handover to the UE earlier was standardized to avoid undesirable reliance on the serving radio link at the time (and radio conditions) when the UE should perform a handover. For example, an HO command can be associated with conditions based on radio conditions similar to radio conditions associated with an A3 event where a particular neighbor node is XdB better than the target. As soon as the conditions are met, the UE performs a handover according to the provided handover command.

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

[0022] Figure 7 shows an example with a single serving cell and target cell. However, in reality, there may be many cells or beams that the UE has reported as possible candidates based on prior RRM measurements. In that case, the network should have the freedom to issue conditional handover commands for some of these candidates. Each of these candidates' RRCConnectionReconfigurations may differ, for example, in terms of HO execution conditions (RS to measure, threshold to exceed) and the random access (RA) preamble 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. When 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 traditional handover.

[0024] Conditional PSCell Modification (CPC) 3GPP® Release 16 The CPC procedure solution was also standardized in Release 16. There, a UE operating in Multi-Radio Dual Connectivity (MR-DC) receives one or more RRC reconfigurations (e.g., RRCReconfiguration messages) in conditional reconfiguration, including SCG configurations such as the Information Element (IE) CellGroupConfig's secondaryCellGroup, along with reconfigurationWithSync, which are stored associated with execution conditions (conditions such as A3 / A5 event configurations). As a result, one of the stored messages is applied only when an execution condition associated with a serving PSCell is met, which will cause the UE to perform a PSCell change (for example, if a better adjacent cell than the current SpCell in the SCG is found).

[0025] 3GPP® Release 17 Inter-SN CPC In 3GPP® Release 17 Solutions for inter-SN CPC are being discussed. One solution, also referred to as Solution 1, has the signaling flow shown in Figure 8. [Overview of the Initiative] [Problems that the invention aims to solve]

[0026] As part of the development of embodiments of the present invention, we will describe the problems initially identified by the inventors.

[0027] In a legacy handover of 3GPP® Release 15 Mobility, the UE receives and applies the reconfiguration to access the target cell. Therefore, if a target candidate who has prepared the configuration would have determined that the current traffic demand would cause the SCG state / operating mode to be deactivated, it will remain unchanged when the UE applies the generated message. As used herein, the SCG state may include, for example, SCG active or SCG inactive. The SCG state may also be referred to as the SCG operating mode. However, in a conditional handover, the time when the target candidate generates the configuration and determines the SCG state may differ significantly from the time when the UE applies the target configuration, so that the traffic situation may have changed when the UE applies an SCG that may have been deactivated, and as a result, the target candidate may activate the SCG immediately after execution. In conclusion, since updating the SCG state 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 can generate a large amount of signaling between the UE and the network, and within the network itself, i.e., between the source MN and the target candidate MN, and between the target candidate MN and the target candidate SN. Furthermore, differences in latency can lead to race conditions.

[0028] For example, suppose a UE configured with MR-DC is configured with CHO, and at least one applicable target candidate configuration, e.g., RRC reconfiguration, includes the MR-DC configuration. When CHO is configured, the SCG state is deactivated, and the target candidate follows that state when generating the SCG configuration stored in the UE and applied at runtime. When the UE begins monitoring execution conditions, an increase in traffic demand may cause the MN and / or S-SN to decide to activate the SCG. Therefore, implementations using currently assumed protocol solutions from previous 3GPP® agreements in this field may result in the following two outcomes: -A)UE applies the target SCG configuration in a suboptimal state, for example, deactivating when it should be activated and another signaling procedure occurring 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, the MN and / or S-SN trigger a change in SCG state, e.g., from inactive to active, triggering a change procedure for each target candidate SN, and as a result, each target candidate SN may update the SCG reconfiguration that is applied at runtime when the execution conditions are met. Then, after obtaining the updated SCG reconfiguration, it provides it to the UE. Thus, this increases the number of CHO procedures by a factor of N both between the source MN and the target candidate MN, between the target candidate MN and the SN candidate Xn interface, and between the network and the UE, where N is the number of times the SCG state has been changed while the UE is configured with a CHO. Furthermore, since these procedures can take time, the risk of a race condition, i.e., the execution of a CHO while the network is obtaining a new SCG reconfiguration in the new state, will increase. This is illustrated in Figure 10.

[0029] An objective of the embodiments herein is, for example, to improve the performance of a wireless communication network using CHO in a multi-radio dual connection. [Means for solving the problem]

[0030] According to one embodiment, the objective is achieved by a method for indicating the status of a secondary cell group (SCG) during a conditional handover (CHO) in a wireless communication network. The method is performed by a user device (UE) or a source MN. The UE is configured with the current SCG. The UE's CHO configuration is obtained from the source MN. The CHO configuration includes the configuration of target candidate nodes. The target candidate nodes include any one or more of the target candidate master nodes (MN) and target candidate secondary nodes (SN). When the CHO execution conditions related to the CHO configuration are met, an indication is sent to the target candidate nodes. The indication shows the SCG status, which is set to either SCG active or SCG inactive.

[0031] In another embodiment, the objective is achieved by a method performed by a first network node acting as a source master node (MN). The method is for handling secondary cell group (SCG) states during a conditional handover (CHO) of a user device (UE) in a wireless communication network. The UE is configured with the current SCG. The UE's conditional handover (CHO) configuration is transmitted to the UE. The CHO configuration includes the configuration of target candidate nodes. The target candidate nodes include any one or more of the target candidate MN and target candidate secondary nodes (SN). The CHO configuration triggers the UE to send an indication to the target candidate nodes when the CHO execution conditions associated with the CHO configuration are met. The indication indicates an SCG state that is set to either SCG active or SCG inactive.

[0032] In another embodiment, the objective is achieved by a method performed by a second network node acting as a target master node (MN). The method is for processing secondary cell group (SCG) status during a conditional handover (CHO) of a user device (UE) in a wireless communication network. The UE is configured with the current SCG. When the CHO execution conditions related to the CHO configuration are met, an indication is received from the UE. The indication shows an SCG status that is set to either SCG active or SCG inactive.

[0033] In another embodiment, the objective is achieved by a method performed by a third network node acting as a target secondary node (SN). The method is for processing secondary cell group (SCG) states during a conditional handover (CHO) of a user device (UE) in a wireless communication network. The UE is configured with the current SCG. When the CHO execution conditions related to the CHO configuration are met, an indication is received from the UE. The indication shows an SCG state that is set to either SCG active or SCG inactive.

[0034] In another embodiment, the objective is achieved by either a user device (UE) or a source master node (MN) configured to indicate a secondary cell group (SCG) state during a conditional handover (CHO) in a wireless communication network. The UE or source MN consists of the current SCG, and the UE or source MN is further configured as follows: - Obtain the Conditional Handover (CHO) configuration of the UE from the Source MN. The CHO configuration is adapted to include the configuration of the target candidate node. The target candidate node is configured to include any one or more of the target candidate MN and target candidate secondary nodes (SN). -When the CHO execution conditions related to the CHO configuration are met, an indication adapted to show an SCG state set to either SCG active or SCG inactive is sent to the target candidate node.

[0035] In another embodiment, the objective is achieved by a first network node acting as a source master node (MN) configured to process secondary cell group (SCG) states during a conditional handover (CHO) to a user device (UE) in a wireless communication network. The UE is configured to consist of the current SCG, and the first network node is further configured as follows: -Send the UE's Conditional Handover (CHO) configuration to the UE. The CHO configuration is adapted to include the configuration of the target candidate nodes. The target candidate nodes are configured to include any one or more of the target candidate master nodes (MNs) and target candidate secondary nodes (SNs). - The CHO configuration is adapted to trigger the UE to send an indication to a target candidate node when the CHO execution conditions associated with the CHO configuration are met. The indication is adapted to show an SCG state that is set to either SCG active or SCG inactive.

[0036] In another embodiment, the objective is achieved by a second network node acting as a target master node (MN) configured to process secondary cell group (SCG) states during a conditional handover (CHO) of a user device (UE) in a wireless communication network. The UE is configured to consist of the current SCG, and the second network node is further configured as follows: - An indication is received from the UE when the CHO execution conditions related to the CHO configuration are met. The indication is adapted to show an SCG state that is set to either SCG active or SCG inactive.

[0037] In another embodiment, the objective is achieved by a third network node acting as a target secondary node (SN) configured to process secondary cell group (SCG) states during a conditional handover (CHO) of a user device (UE) in a wireless communication network. The UE is configured to consist of the current SCG, and 3 The network nodes are further configured as follows: - An indication is received from the UE when the CHO execution conditions related to the CHO configuration are met. The indication is adapted to show an SCG state that is set to either SCG active or SCG inactive.

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

[0039] Embodiments of this specification enable target MN112 to notify T-SN of the current SCG state during CHO execution. By transmitting this information at runtime, it becomes unnecessary to update the CHO configuration stored in, for example, UE120 every time the SCG state changes. This can prevent a lot of signaling within the network between source MN111 and target candidate MN112, and between target candidate MN112 and candidate T-SN113, as well as a lot of signaling directed to UE120. [Brief explanation of the drawing]

[0040] [Figure 1] A block diagram illustrating an example of background technology. [Figure 2] A block diagram illustrating an example of background technology. [Figure 3] A block diagram illustrating an example of background technology. [Figure 4] A block diagram illustrating an example of background technology. [Figure 5] A block diagram illustrating an example of background technology. [Figure 6] A block diagram illustrating an example of background technology. [Figure 7]A signaling diagram illustrating an example of background technology. [Figure 8] A signaling diagram illustrating an example of background technology. [Figure 9] A signaling diagram illustrating an example of background technology. [Figure 10] A signaling diagram illustrating an example of background technology. [Figure 11] A block diagram showing an embodiment of a wireless communication network. [Figure 12] A flowchart of an embodiment of the method in UE or source MN. [Figure 13] A flowchart of an embodiment of the method at the first network node. [Figure 14] A flowchart of an embodiment of the method at the second network node. [Figure 15] A flowchart of an embodiment of the method at the third network node. [Figure 16] A signaling diagram illustrating an exemplary embodiment. [Figure 17a] A block diagram showing an embodiment of the UE or source MN. [Figure 17b] A block diagram showing an embodiment of the UE or source MN. [Figure 18a] A block diagram showing an embodiment of the first network node. [Figure 18b] A block diagram showing an embodiment of the first network node. [Figure 19a] A block diagram showing an embodiment of the second network node. [Figure 19b] A block diagram showing an embodiment of the second network node. [Figure 20a] A block diagram showing an embodiment of the third network node. [Figure 20b] A block diagram showing an embodiment of the third network node. [Figure 21] A diagram showing a communication network connected to a host computer via an intermediate network. [Figure 22] A generalized block diagram of a host computer communicating with user equipment via a partial wireless connection through a base station. [Figure 23] A flowchart illustrating how to perform the operation in a communication system including a host computer, base station, and user equipment. [Figure 24] A flowchart illustrating how to perform the operation in a communication system including a host computer, base station, and user equipment. [Figure 25] A flowchart illustrating how to perform the operation in a communication system including a host computer, base station, and user equipment. [Figure 26] A flowchart illustrating how to perform the operation in a communication system including a host computer, base station, and user equipment. [Modes for carrying out the invention]

[0041] Figure 11 shows a schematic of a wireless communication network 100 in which an embodiment may be implemented. The wireless communication network 100 has one or more RANs and one or more CNs. The wireless communication network 100 may use 5G NR, but several other different technologies, some possible implementations, may further use WiFi, LTE, LTE Advanced, Wideband Code Division Multiple Access (WCDMA®), Global System for Mobile Communications / Enhanced Data Rate for GSM Evolution (GSM / EDGE), or Ultra Mobile Broadband (UMB).

[0042] Network nodes such as the first network node 111, the second network node 112, and the third network node 113 operate within the wireless communication network 100 by an antenna beam, referred to herein as a beam. The first, second, and third network nodes 111, 112, and 113 each provide, for example, several cells, which can be used to communicate with, for example, the UE 120. The first, second, and third network nodes 111, 112, and 113 can each be a radio base station, such as a transmitting point and a receiving point, a radio access network node such as a base station, such as Node B, Advanced Node B (eNB, eNodeB, eNode B), NR Node B (gNB), base station transceiver station, radio remote unit, access point base station, base station router, radio base station transmitting configuration, standalone access point, wireless local area network (WLAN) access point, access point station (AP STA), access controller, UE that functions as an access point or peer in device-to-device (D2D) communication, or other network units that can communicate with the UE served by the first and second network nodes 111 and 112, respectively, depending on the radio access technology and terminology used.

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

[0044] UEs such as UE120 operate within the wireless communication network 100. UE120 may be configured as an MR-DC to communicate with, for example, an MCG controlled by an MN and an SCG controlled by an SN, such as first and second network nodes 111 and 112. UE120 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, such as a base station such as network node 110, or an STA that communicates with one or more access networks (ANs), such as one or more core networks (CNs) via a RAN. Those skilled in the art should understand that UE is a non-exclusive term meaning any UE such as a terminal, wireless communication terminal, user equipment, D2D terminal, or node, such as a smartphone, laptop, mobile phone, sensor, repeater, mobile tablet, or a small base station communicating within a cell.

[0045] In some embodiments, the methods described herein may be performed by a first network node 111, a second network node 112, and a third network node 113. Alternatively, distributed nodes (DNs) and functions included in, for example, the cloud 140 shown in Figure 10 may be used to perform, or partially perform, the methods.

[0046] Several exemplary embodiments provide a method for a UE120 to indicate the SCG status when a CHO is executed on a target candidate, the target candidate including an SCG configuration. In some embodiments, the method includes the UE120 indicating the current SCG status to a selected target candidate MN112 and / or target candidate SN113 when a CHO is executed, for example, when the UE120 is configured as an MR-DC and monitoring the CHO execution conditions. On the network side, based on this indication, target candidate MN112 may trigger an MN-initiated SCG deactivation / activation, or target candidate SN113 may trigger an SN-initiated SCG deactivation / activation.

[0047] Some examples of methods include having UE120 always set the SCG state of the SCG candidate to inactive. The logic would be to react to the traffic evaluation after the CHO execution, causing the target candidate MN112 and / or target candidate SN113 to activate the SCG after the CHO execution.

[0048] Some examples of the method involve UE120 always setting the SCG state of the target candidate of the SCG to active. The logic would be to react to the target candidate MN112 and / or target candidate SN113 in response to the traffic evaluation after the CHO execution, and possibly deactivate the SCG after the CHO execution. One advantage here is that it works even if the target candidate does not support a deactivated SCG.

[0049] Some examples of the method involve UE120 setting the SCG state of the target candidate SCG to a value pre-configured by MN, e.g., active or inactive. The logic would then react to the traffic evaluation after the CHO execution, causing target candidate MN112 and / or target candidate SN113 to potentially deactivate the SCG after the CHO execution. One advantage here is that it works even if the target candidate does not support a deactivated SCG.

[0050] Some examples of methods include having UE120 set the SCG state of the SCG target candidate to the latest SCG state that UE120 has when the CHO is executed.

[0051] Some examples of the method include target candidate MN112 notifying target candidate SN113 of the current SCG state of UE120 during CHO execution, and / or UE120 determining the target candidate SCG state based on the current SCG state during CHO execution.

[0052] Figure 12 shows an exemplary method performed by UE120, or, for example, source MN111. UE120 may also be referred to as a wireless device or wireless terminal. The method is for indicating an SCG state during a CHO in a wireless communication network 100. The objective is to enable UE120 to determine which SCG should be considered as the SCG configuration applied when the CHO is running, and the target candidate configurations for the CHO include an MR-DC configuration that includes the SCG configuration. Thanks to this, when the CHO is running, there is no need to update the CHO configuration stored in UE120, for example, whenever the SCG state changes in source MN, while UE120 is still monitoring the CHO conditions. This can prevent a large amount of signaling to UE120 and reduce the energy consumption of UE120.

[0053] UE120 is configured with the current SCG, for example, UE120 is configured with MR-DC. As used herein, the current SCG means, for example, the SCG configured when UE120 is configured with MR-DC, that is, it is the SCG that is currently in use. UE120 is configured with, for example, MR-DC and transmits and / or receives data to and from MCG, MN, SCG and SN unless the current SCG is deactivated. This method may include any one or more of the following actions. The following actions may be performed in any appropriate order.

[0054] Action 1201 UE120 obtains its CHO configuration from source MN111. The CHO configuration includes the configurations of target candidate nodes 112 and 113. Note that while UE120 obtains the configuration of target candidate node 112, UE120 may not be aware of which node that configuration belongs to.

[0055] The CHO configuration may include, for example, the target configuration of UE120, and the target configuration may include, for example, both an MCG configuration and an SCG configuration. The MN node configuration may be an MCG configuration recognized by UE120, and the SN node configuration may be an SCG configuration.

[0056] Target candidate nodes 112 and 113 may include any one or more of target candidate MN112 and target candidate SN113. This means that target candidate nodes 112 and 113 could be, for example, target candidate MN112 or target candidate SN113.

[0057] Action 1202 In some embodiments, UE120 obtains the current SCG state, for example, by receiving it. The current SCG state can be set to SCG active or SCG inactive. The current SCG state may be the SCG state that UE120 has when the execution of CHO is started. The execution of CHO may be performed on a source SN. Note that, for example, the source SN may be the same node as the target SN, since the same PSCell and / or SCG are maintained in the CHO.

[0058] Please note that the terms “SCG activation” and “SCG deactivation” used herein refer to states, not actions, and are therefore also referred to as “SCG active” and “SCG inactive.”

[0059] Action 1203 In some embodiments, the UE120 acquires the target SCG state by, for example, setting it to one of the following: - Always inactive - Always active - For example, a value pre-configured as active or inactive by source MN111 -The latest SCG state that UE120 has when CHO is executed, for example, the current SCG state.

[0060] Action 1204 UE120 sends an indication to target candidate nodes 112 and 113. The indication is sent when the CHO execution conditions related to the CHO configuration are met. The indication shows the SCG status, which is set to either SCG active or SCG inactive.

[0061] The displayed SCG state may be set according to either the current SCG state or / or the target SCG state.

[0062] The indication may, for example, show a target SCG state that is SCG active or SCG inactive, initiated by selected target candidate nodes 112, 113, which include any one or more of target candidate nodes MN112 and / or target candidate SN113.

[0063] For example, this could mean setting an SCG state for target SN113 as part of applying a CHO configuration with SCG, and causing UE120 and target network nodes 112 and 113 to operate accordingly.

[0064] In some embodiments, sending an indication may include UE120 performing random access to target candidate nodes 112, 113 to indicate that the SCG is activated.

[0065] Figure 13 shows an exemplary method performed by a first network node 111 acting as source MN111. The method is for processing the SCG state during a CHO to UE120 in the wireless communication network 100. UE120 is configured with the current SCG.

[0066] This method may include any one or more of the following actions. These actions may be performed in any appropriate order.

[0067] Action 1301 The first network node 111 transmits the CHO configuration for UE120 to UE120. The CHO configuration includes the configurations of target candidate nodes 112 and 113. Target candidate nodes 112 and 113 may include any one or more of target candidate MN112 and target candidate SN113.

[0068] The CHO configuration triggers UE120 to send an indication to target candidate nodes 112 and 113 when the CHO execution conditions associated with the CHO configuration are met. The indication shows an SCG state, which is set to either SCG active or SCG inactive. The SCG state may include either the current SCG state or / 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 can be set to SCG active or SCG inactive.

[0070] In these embodiments, indications to target candidate nodes 112 and 113 may indicate the current SCG state. In these embodiments, for example, an indication in action 1301 may set the target SCG state to SCG active or SCG inactive, initiated by the selected target candidate nodes 112 and 113. Target candidate nodes 112 and 113 may include, for example, any one or more of target candidate MN112 and target candidate SN113.

[0071] Action 1303 In some embodiments, the first network node 111 can configure the UE 120 by setting the target SCG state to one of the following: - Always inactive - Always active - A value pre-configured as active or inactive, - The latest SCG state that UE120 has when CHO is executed

[0072] For example, in these embodiments, the indication may indicate the target SCG state, as described in actions 1301-1302 above. This may mean that MN111 configures UE120 to transmit the current SCG state as the target SCG state.

[0073] Figure 14 shows an exemplary method performed by a second network node 112 acting as target MN112. The method is for processing the SCG state during a CHO to UE120 in the wireless communication network 100. UE120 is configured with the current SCG.

[0074] This method may include any one or more of the following actions. These actions may be performed in any appropriate order.

[0075] Action 1401 The second network node 112 receives an indication from UE 120 when the CHO execution conditions related to the CHO configuration are met. The indication may indicate an SCG state that is set to either SCG active or SCG inactive.

[0076] The SCG state may include either the current SCG state or / or the target SCG state.

[0077] In some embodiments, if the indication shows the 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 shows a target SCG state that includes inactivity, such as the target SCG state being set to SCG inactive, the second network node 112 reacts by, for example, activating the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution.

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

[0080] In some embodiments, for example, if the indication shows a target SCG state that includes a pre-configured value such as active or inactive, the second network node 112 reacts by, for example, possibly deactivating or activating the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution.

[0081] Figure 15 shows an exemplary method performed by a third network node 113 acting as target SN113. The method is for processing the SCG state during a CHO to UE120 in the wireless communication network 100. UE120 consists of the current SCG. The method may include any one or more of the following actions. The following actions may be performed in any appropriate order.

[0082] Action 1504 The third network node 113 receives an indication from UE 120, for example, when the CHO execution conditions related to the CHO configuration are met. The indication may indicate an SCG state set to either SCG active or SCG inactive. The SCG state may include either the current SCG state or the target SCG state.

[0083] In some embodiments, if the indication shows the 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 shows a target SCG state that includes inactivity, such as the target SCG state being set to SCG inactive, the third network node 113 reacts by, for example, activating the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution.

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

[0086] In some embodiments, for example, if the indication shows a target SCG state that includes a pre-configured value such as active or inactive, the third network node 113 reacts by, for example, possibly deactivating or activating the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution.

[0087] Embodiments of this specification refer to a first network node 111 that operates as a source MN having an MCG and / or MN termination bearer configured for a UE120, where the MN may be a gNodeB or central unit gNodeB (CU-gNB), an eNodeB or central unit eNodeB (CU-eNB), or any network node and / or network function. Note that the terms "first network node 111", "source MN 111", and "source MN" may be used interchangeably herein.

[0088] Embodiments of this specification refer to a second network node 112 acting as a target MN having an MCG configured for an MN, for example, a UE120 and / or an MN termination bearer, the MN being a gNodeB, or a central unit gNodeB (CU-gNB), or an eNodeB, or a CU-eNB, or any network node and / or network function. Note that the terms "second network node 112", "target MN 112", and "target candidate MN" and "target MN" may be used interchangeably herein.

[0089] Embodiments of this specification also refer, for example, to a secondary node (SN) 110 or source secondary node (S-SN) having a pre-configured (i.e., unconnected) secondary cell group (SCG) on UE 120, where the SN may be a gNodeB or central unit gNodeB (CU-gNB), eNodeB or CU-eNB, or any network node and / or network function. Note 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 text, the terms “secondary node (SN),” “target candidate SN113,” or “third network node 113” acting as the target SN113 are often used. This is equivalent to saying that it is the network node associated with the target candidate SN113 or the configured target candidate PSCell. When UE120 connects to that cell, if the cell is associated with that node, then sending and receiving data to and from UE120 will be handled by that node. Note that the terms “third network node 113,” “target SN113,” “target candidate SN,” and “target SN” may be used interchangeably in this specification.

[0091] The text states that a cell exists within a node, for example, that a target candidate cell exists within S-SN or t-SN. This is equivalent to 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 is of a node.

[0092] "SN-Initiated CPC" corresponds to the procedure in which the source SN of a UE120 configured with MR-DC determines whether it constitutes a CPC. Once determined, the source SN selects one or more target candidate cells (target candidate PSCells) such that at least one cell is associated with the source SN and at least another cell is associated with an adjacent SN, for example, based on reported measurements. If all target candidate cells are associated with the source SN, it can be said to be an "SN-Initiated Intra-SN CPC," which may be called a Release 16 solution. If at least one target candidate cell is associated with an adjacent SN, it can be said to be an "SN-Initiated Inter-SN CPC," which may be called a Release 17 solution.

[0093] In this specification, candidate SN, SN candidate, or SN is prepared during the CPA procedure, provided to UE120 along with execution conditions, and stored in the SCG configuration (e.g., RRCReconfiguration). **Referencing a network node (e.g., gNodeB) capable of creating an RRC reconfiguration message with ), UE120 applies the message only if the execution conditions are met. Its candidate SN is associated with one or more PSCell candidate cells that may be configured in UE120. ** This refers to the SCG configuration provided and stored in UE120, for example, RRCReconfiguration ** A reference to an RRC reconstruction message containing the following can be applied by UE120 during CHO execution. UE120 can then execute the condition and access one of these candidate cells associated with a candidate SN that will become an SN or simply an SN after execution (i.e., when the execution condition is satisfied).

[0094] This specification refers to procedures such as CPC configuration and CPC execution, and in most cases refers to procedures such as CPC execution from the perspective of UE120. Since the message that is saved and applied when the conditions are met is RRCReconfiguration or RRCConnectionReconfiguration, other terms can be considered synonyms for conditional reconfiguration or conditional configuration. In terms of terminology, CHO can be interpreted in a broader sense to also cover CPA (conditional PSCell change) procedures. In this specification, in order to refer to procedures between network nodes, the procedure is referred to from the perspective of UE120 and mainly refers to conditional SN changes, where a node requests a target candidate SN113 (which may be the same as the source SN or adjacent SN) to configure a CPC for at least one of the related cells (cells related to target candidate SN113).

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

[0096] In this specification, the adjacent SN and the source SN are referred to as different entities, but both could be the target candidate SN113 of the CPC.

[0097] CPC configuration can be performed using the same IE as conditional handover and may be called conditional configuration or conditional reconfiguration. The principles of configuration are the same as those for configuring trigger / execution conditions and the reconfiguration message applied when the trigger condition is met. The configuration IE from 3GPP® TS38.331 is: -ConditionalReconfiguration IE ConditionalReconfiguration is used to add, modify, and release conditional configurations. ConditionalReconfiguration information element

[0098] [Table 1]

[0099] [Table 2]

[0100] -CondConfigId The IE CondConfigId is used to identify the CHO or CPC configuration. CondConfigId information element

[0101] [Table 3]

[0102] -CondConfigToAddModList IE CHO-ConfigToAddModList relates to a list of conditional configurations to add or modify, and each entry includes a cho-ConfigId and its 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 they are generated by MN111, generated by source SN, or generated by target candidate SN113.

[0106] In a different embodiment, if the CPC configuration is not configured as an MR-DC configuration of mrdc-SecondaryCellGroup (as defined in 3GPP® TS38.331), the CPC is said to be in MN format. In other words, UE120 receives an RRCReconfiguration from MN that may contain mrdc-SecondaryCellGroup (for example, if UE120 is also configured with SCG MeasConfig for interSN CPC), but the CPC is not in its container. That is, the above IE (e.g., IE ConditionalReconfiguration) is not included in mrdc-SecondaryCellGroup.

[0107] In a different embodiment, when the CPC configuration is configured as an MR-DC configuration of mrdc-SecondaryCellGroup (as defined in 3GPP® TS38.331), the CPC is said to be in SN format. In other words, UE120 receives an RRCReconfiguration from MN which may contain mrdc-SecondaryCellGroup, and the CPC is within that container. This means that the IEs listed above (e.g., IE ConditionalReconfiguration) are contained within mrdc-SecondaryCellGroup (e.g., within a set of other nested IEs).

[0108] In this text, the term "secondary node (SN)" or "target SN113" is frequently used. This is equivalent to saying that this is the target candidate SN113, or the network node associated with the configured target candidate PSCell.

[0109] Several exemplary embodiments are described below.

[0110] Example A0. Some embodiments include a wireless terminal, e.g., UE120, or a method for UE120 configured with a current SCG and MR-DC by source MN111. - Receiving a CHO configuration that includes the configuration of a target candidate cell, and the configuration being applied by UE120 when the execution conditions monitored by UE120 are met upon receipt of the CHO configuration, -Receive at least one indication about the current SCG state of the SCG, and set the current SCG state of the SCG to either SCG inactive or SCG active based on the indication. -When the execution conditions are met, for example, select a target candidate cell provided by either target MN112 or target SN113, and apply the configuration to the selected target candidate cell. - When applying a configuration to one of the target candidate cells, for example, target MN112 or target SN113, an RRC Reconfiguration Complete message is sent to the selected target candidate cell, and at least one of the following actions related to the SCG state (or combination thereof) indicated in the message is performed: ○Include an indication of the latest state of the current SCG when RRC reconstruction is complete. If the target candidate's configuration includes an SCG configuration, the target candidate's SCG state is considered the latest state of the current SCG, and an action is taken accordingly, for example, if the latest state of the current SCG is activated, random access to the target candidate PSCell is performed. If the target candidate's configuration includes an SCG configuration, the SCG state of the target candidate is always assumed to be activated, regardless of the current state of the SCG, and actions such as performing random access to the target candidate's PSCell are performed accordingly. If the target candidate's configuration includes an SCG configuration, the SCG state of the target candidate will always be considered deactivated, regardless of the current state of the SCG, and actions will be taken accordingly. If the target candidate's configuration includes an SCG configuration, regardless of the current state of the SCG, the SCG state of the target candidate will be considered to be set to an SCG configuration, and actions will be taken accordingly.

[0111] Example A0b. In the example according to Example A0, if the configuration of the target candidate cell to which UE120 applies includes an SCG configuration, UE120 performs at least one of the actions related to the SCG state.

[0112] Example A1. In the example according to Example A0, when UE120 determines the SCG state of the selected target candidate SCG, it ignores the SCG state information or configuration included in the target candidate SCG configuration.

[0113] Example A2. In the example according to Example A0, UE120 receives one or more indications about the current SCG state of the 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 the example according to Example A0, the current SCG state is the SCG state indicated by the last received SCG state indication before UE120 applied the selected target candidate SCG.

[0115] Example A4. In the example according to Example A0, RRC reconfiguration completion is MN RRC reconfiguration completion, which is triggered in response to UE120 applying the MCG configuration.

[0116] Example A5. In the example according to Example A0, RRC reconstruction completion is SN RRC reconstruction completion included within MN RRC reconstruction completion, and SN RRC reconstruction completion is triggered in response to UE120 applying the SCG configuration.

[0117] Example A20. Some embodiments include a method in a first network node 111 that operates as the master node (MN) of a UE120 configured with an MR-DC, where the UE120 is currently composed of an SCG and a CHO, and the method is - Sending a CHO configuration to UE120 that includes one or more target candidate SCG configurations, wherein each target candidate SCG configuration and MCG configuration is applied by UE120 when the execution conditions monitored by UE120 upon receipt of the CHO configuration are met. - Sending one or more indications about the current SCG state of the SCG, the current SCG state of the SCG can be set to SCG inactive or SCG active, The method for a second network node acting as a master node (MN), for example, MN112, is as follows: - From UE120, RRCReconfigurationComplete to SN, indicating that UE120 has performed CHO. ** Receiving an RRCReconfigurationComplete message, which may include, means that UE120 sends the message after applying the selected target candidate MCG and target candidate SCG configurations. - This includes forwarding a reconfiguration completion message and an indication of the determined SCG state of the selected target candidate SCG to the third network node acting as the target candidate SN113 of the selected target candidate SCG.

[0118] Example A21. An example according to Example A20, in which a first network node 111 acting as the MN of UE120 decides to configure UE120 with a CHO having an MR-DC configuration and to trigger a request to a second network node requesting the MR-DC configuration of UE120, i.e., one or more target candidate SCG configurations.

[0119] Example A22. In the example according to Example A20, one or more indications of the current SCG state of the SCG may be determined by source MN111 or source SN based on traffic demand in 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) of UE120 configured as an MR-DC, where UE120 is configured with a CHO including an MR-DC configuration, using a current secondary cell group (SCG), and possibly setting the SCG state to inactive or active, and the method - Receiving a CHO request from target candidate MN112, generating one or more target candidate PSCell configurations for the CHO with MR-DC, and transmitting one or more of these target candidate PSCell configurations to target candidate MN112, wherein UE120 applies one of the configurations when one execution condition monitored by UE120 is met upon receipt of the CHO configuration. -Receive a reconfiguration completion message for the selected target candidate SCG from target candidate MN112, and an indication of the determined SCG status of the selected target candidate SCG. - This includes performing an action on UE120 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 UE120 configured for conditional handover, the method being: - Receiving a handover request for conditional handover from a first network node 111 acting as the master node of UE120 configured with MR-DC, which has at least one SCG, - Sending a handover request acknowledgment message containing the configuration of the target candidate cell, which is applied by UE120 when the execution conditions monitored by UE120 are met upon receipt of the CHO configuration, -Receive RRC reconfiguration completion from UE120 and perform at least one of the following actions: In the RRC reconstruction complete message, UE120 further receives an indication of the latest SCG state it has with respect to the source SCG, and assumes that UE120 will operate with the target SCG according to the indicated state. If the target candidate's configuration includes an SCG configuration, the target candidate's SCG state is considered the latest state of the current SCG, and an action is performed accordingly. For example, if the latest state of the current SCG is active, random access to the target candidate's PSCell is performed. If the target candidate's configuration includes an SCG configuration, the SCG state of the target candidate is always considered active, regardless of the current state of the SCG, and actions such as performing random access with UE120 are performed accordingly. The target candidate PSCell then responds, for example, to random access requests / preambles from UE120. If the target candidate's configuration includes an SCG configuration, the SCG state of the target candidate will always be considered inactive, regardless of the current state of the SCG, and actions will be taken accordingly. If the target candidate's configuration includes an SCG configuration, regardless of the current state of the SCG, the SCG state of the target candidate will be considered to be set to an SCG configuration, and actions will be taken accordingly. ○ Presumably, the SCG state applied to the landing UE120 is shown to the target candidate SN113.

[0122] Several further embodiments Indication of SCG inactivity during CHO in MR-DC Figure 16 shows the indication of SCG inactivity during CHO in MR-DC (related to exemplary set A).

[0123] In a series of embodiments, some embodiments are, By UE120 or, for example, source MN111 This includes the method of execution. This relates to the method of execution by UE120 or, for example, the aforementioned source MN111, and can be incorporated into this method. The method is -Having an MR-DC configuration in which the SCG state may be set to active or inactive, - Receiving a CHO configuration from the network, which includes an MR-DC configuration, corresponding to an RRCReconfiguration message containing a CHO configuration with an MR-DC in the target configuration, and the CHO configuration is applied if the conditions are met (where the applied SCG message is RRCReconfiguration). ** This can be shown. In some embodiments, the message includes an indication that UE120 should continue to use the same SCG state as when the conditions were met and a new target configuration was applied. In other words, if UE120 has deactivated its current SCG when it performs CHO on MR-DC, UE120 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. In some embodiments, the CHO configuration also includes an SCG measurement configuration such as SCG MeasConfig, which includes a reporting configuration for configuring measurement objects associated with the event of the execution condition and / or the frequency of the target candidate PSCell (e.g., SSB frequency, SSB ARFCN), and a measurement identifier referenced in the CHO configuration of the target candidate. -In response to the configuration of a CHO with MR-DC, send RRCReconfigurationComplete to the network, - Receiving an indication (e.g., an RRCReconfiguration message) from the network (e.g., from a network node operating as an MN or a network node operating as an SN) that indicates the SCG state (operating mode) and / or a change in the SCG state (operating mode), For example, if the state was activated, this could be an indication to change it to deactivated, and if the state was deactivated, this could be an indication to change it to activated. ○When UE120 is configured with a CHO having an MR-DC and is monitoring the execution conditions of the CHO having an MR-DC, UE120 may receive one or more indications to set the SCG state. ○In some embodiments, UE120 receives an indication before it is configured with a CHO having an MR-DC, i.e., when UE120 is configured with a CHO, UE120 has already received an SCG status indication. ○In some embodiments, UE120 receives an indication after being configured with a CHO having an MR-DC. ○In some embodiments, UE120 receives an indication when it is configured with a CHO having an MR-DC, i.e., in the same message configured with UE120 having a CHO having an MR-DC, UE120 also receives an indication of the SCG status. ○This may be one or more indications of the current SCG state, which can be set to SCG inactive or SCG active. The current SCG is the SCG configured in UE120 when UE120 receives a CHO with an MR-DC configuration. ○ The indication may be an indication in an MCG configuration or an SCG configuration (for example, generated by a network node acting as an SN). - When the execution conditions are met, select a target candidate and apply the target candidate configuration, including the selected target candidate MCG and SCG configurations. - Determine that the SCG state of the selected target candidate SCG is the same as the current SCG state, In some embodiments, this can be achieved by delta signaling. A target candidate SN113 capable of SCG deactivation can indicate this to the UE120 with a flag, and as a result, the UE120 can 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 SN113 does not include an indication of a deactivated SCG, and its absence means that the target candidate SCG state is considered to be the SCG state of the current SCG when the UE120 performs the CPC. - Applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending RRCReconfigurationComplete to the first network node, and performing further actions according to the determined SCG state of the selected target candidate SCG, including: In some embodiments, sending RRCReconfigurationComplete indicates that the conditions in UE120 have been met and that UE120 has applied the target configuration. **In response to transmitting RRCReconfigurationComplete including ** it is transferred from the MN to the SN. The UE 120 still uses the same SCG state as before the message RRCReconfiguration ** is applied. 〇In some embodiments, the 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 for the UE 120 when the UE 120 performs CHO. One advantage of this embodiment is that since the SCG state is considered to be included within the RRCReconfigurationComplete ** the MN does not need to worry about indicating the SCG state to the target candidate SN 113 via the XnAP information. 〇In some embodiments, the RRC reconfiguration complete (e.g., RRCeconfigurationComplete ** ) also includes an indication of the SCG state of the selected SCG proposed / requested by the UE 120. 〇In some embodiments, when the conditions in the UE 120 are met and the UE 120 applies the target configuration and executes a PSCell change, it starts operating according to the SCG state that the UE 120 had before the RRCReconfigurationComplete ** including RRCReconfigurationComplete is sent to the T-SN indicating this. The UE 120 still uses the same SCG state as before the message RRCReconfiguration ** is applied. 〇In some embodiments, if the determined SCG state is active, upon determining the state, the UE 120 triggers a random access to the selected target SCG. In some embodiments, if the determined SCG state is inactive, determining the state does not trigger random access to the selected target SCG. In some embodiments, if the determined SCG state is inactive, once the state is determined, UE120 triggers random access to the selected target SCG only if explicitly indicated by the network (for example, if the network wants UE120 to prepare for faster activation later). In other words, even if an SCG is changed to an inactive SCG, UE120 is ready to activate the SCG immediately afterward by performing random access. In some embodiments, UE120 receives a target candidate SCG configuration (as part of a CHO with an MR-DC configuration) that includes configurations specific to an SCG state. For example, some configurations are applied only when it is determined that an SCG state is activated. For example, some configurations are applicable only when it is determined that an SCG state is deactivated. When UE120 applies a CHO with an MR-DC configuration, it applies the SCG configuration associated with the determined SCG state and begins operation according to that configuration. In an alternative example, UE120 may apply the received configuration to both (or all) SCG states, e.g., both SCG active and SCG inactive, but begin operation according to the configuration of the determined state. For example, if the determined SCG state is inactive, UE120 begins operation according to the configuration of the deactivated SCG, rather than according to the configuration specific to an activated SCG, but will also store the configuration for an activated SCG. Next, if the SCG state is changed to SCG active, UE120 will instead begin operating according to the configuration stored for the activated SCG (but not according to the configuration specific to the deactivated SCG). In some embodiments, UE120 receives an MCG configuration (as part of a CHO having an MR-DC configuration) that includes configurations specific to the SCG state (i.e., some parts of the configuration are applied only when the SCG state is determined to be active, and other parts of the configuration are applied only when the SCG state is determined to be inactive). When UE120 applies a CHO having an MR-DC configuration, it applies the MCG configuration associated with the determined SCG state and begins operating according to that configuration.

[0124] Some embodiments include, Source MN111 This includes the method of execution. This relates to the method executed by the first network node 111 described above and can be incorporated into this method. The method is - Send a message to the target candidate master node (MN) 112 requesting the configuration of the CHO with an MR-DC configuration, the message including the current configuration of UE 120 indicating that UE 120 is configured with a deactivated SCG or that a deactivated SCG is possible. ○ In some embodiments, the message is a HANDOVERREQUEST message. ○In some embodiments, the current SCG configuration is included in the SN configuration within HandoverPreparationInformation. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. - Receiving a message from target candidate MN112 including a CHO with an MR-DC configuration, the MR-DC configuration including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by UE120 when the execution conditions monitored by UE120 upon receipt of the CPC configuration are met, and each target candidate SCG configuration is RRCReconfiguration **It is included in the SCG RRC reconstruction message, which is presented as follows: ○ In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. ○In some embodiments, the message is that the conditions are met and the target configuration RRCReconfiguration ** This includes an indication that UE120 is permitted (and / or must continue to use) the same SCG state as when it was applied, which may be an absence parameter whose presence would indicate the deactivation of the SCG, and a second parameter which may be an absence parameter whose presence would indicate the deactivation of the SCG, and which may be an absence parameter whose presence would indicate the deactivation of the SCG, and a second parameter which indicates that UE120 may (and / or will continue to use) the current SCG state in the new SCG to which it is applied. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. -Send an RRCReconfiguration message to UE120 including the configuration of the CHO with MR-DC, -Receive RRCReconfigurationComplete from UE120, indicating that CHO with MR-DC has been configured. - For example, changing the SCG state of UE120 by sending an RRCReconfiguration message containing the new SCG state to UE120, where the state is changed from active to inactive, and from inactive to active. -Includes receiving a response message RRCReconfigurationComplete from UE120 indicating that the SCG state has been changed.

[0125] Some embodiments include, Target MN112This includes the method of execution. This relates to the method performed by the second network node 112 described above and can be incorporated into this method. The method is - A message is sent to target candidate SN113 requesting the configuration of a CHO having an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with or can be deactivated using a deactivated SCG, ○ In some embodiments, the message is an S-NODE ADDITION REQUEST message. In some embodiments, the current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. In some embodiments, target MN112 decides to configure UE120 using MR-DC in a CHO configuration. - Receiving a message from a target candidate secondary node (SN) containing an SCG configuration that includes one or more target candidate SCG configurations, each target candidate SCG configuration being applied by UE120 when the execution conditions monitored by UE120 upon receipt of the CHO configuration are met, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the message is that the conditions are met and the target configuration RRCReconfiguration **This includes an indication that UE120 is permitted (and / or must continue to use) the same SCG state as when it was applied, which may be an absence parameter whose presence indicates the deactivation of the SCG, or an absence parameter whose presence indicates the deactivation of the SCG, and a second parameter indicating that UE120 can (and / will continue to use) the current SCG state in the new SCG to which it is applied. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - A response message indicating that a CHO with MR-DC has been configured, such as HANDOVER REQUEST ACKNOWLEDGE, is sent to the source MN, - From UE120, RRCReconfigurationComplete to T-SN indicating that the conditions in UE120 have been met and UE120 has applied CHO with target configuration and MR-DC configuration. ** Receiving an RRCReconfigurationComplete message that includes, - The RRCReconfigurationComplete message contains an indication of the current SCG status of UE120. ** This includes forwarding the message to T-SN, Some embodiments include a method performed by a target secondary node (SN) candidate, and the method is - Receiving a message from the target master node (MN) requesting the configuration of the CHO's SCG with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with or can be deactivated using a deactivated SCG, ○The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. - RRCReconfiguration including UE120 target configuration ** Sending a message containing the following to the master node (MN): ○The message is an S-NODE ADDITION REQUEST ACK message. ○ The message indicates that the conditions have been met and the target configuration RRCReconfiguration ** This includes an indication that UE120 is allowed to continue using the same SCG state as when the condition was applied. ○UE120 Target Configuration RRCReconfiguration ** This does not include information about which SCG state to use. - From MN, RRCReconfigurationComplete is a message containing an indication from UE120 regarding the current SCG status. ** Receiving a message and, ○If the SCG status is currently inactive, do not immediately expect random access from UE120. - This includes deciding whether to maintain or change the current SCG state.

[0126] In some embodiments, the target secondary node (SN) 113 has an RRCReconfiguration with the target configuration of UE 120. ** It includes configurations specific to a particular SCG state within it. For example, the target configuration of UE120 may include some configurations specific to when an SCG state is activated, and also some configurations specific to when an SCG state is deactivated.

[0127] UE120 always sets the SCG status of SCG target candidates to inactive.

[0128] In a series of embodiments, some embodiments include methods that are performed by UE120 or, for example, source MN111. Or, for example, by the source MN111 mentioned above It relates to the way it is executed and can be incorporated into this method. The method is -Having an MR-DC configuration in which the SCG state can be set to active or inactive, -Receive a CHO configuration from the network, which includes the MR-DC configuration, corresponding to an RRCReconfiguration message containing the CHO configuration with the MR-DC in the target configuration, and the CHO configuration is applied if the conditions are met (where the applied SCG message is RRCReconfiguration). ** This can be shown by, In some embodiments, the CHO configuration also includes an SCG measurement configuration such as SCG MeasConfig, which includes a reporting configuration for configuring a measurement object associated with the event of the execution condition and / or the frequency of the target candidate PSCell (e.g., SSB frequency, SSB ARFCN) and a measurement identifier referenced in the CHO configuration of the target candidate. -In response to the configuration of a CHO with MR-DC, send RRCReconfigurationComplete to the network, - Receiving an indication (e.g., an RRCReconfiguration message) from the network (e.g., from a network node operating as an MN or a network node operating as an SN) that indicates the SCG state (operating mode) and / or a change in the SCG state (operating mode), For example, if the state was activated, this could be an indication to change it to deactivated, and if the state was deactivated, this could be an indication to change it to activated. ○UE120 is configured with a CHO including MR-DC, and while monitoring the execution conditions of the CHO including MR-DC, UE120 may receive one or more indications to set the SCG state. In some embodiments, UE120 receives an indication before it is configured with a CHO including MR-DC, i.e., when UE120 is configured with a CHO, UE120 has already received an SCG status indication. In some embodiments, UE120 receives an indication after being configured with a CHO including MR-DC. In some embodiments, UE120 receives an indication when it is configured with a CHO that includes an MR-DC, i.e., in the same message in which UE120 is configured with a CHO that includes an MR-DC, UE120 also receives an indication of the SCG status. This may be one or more indications about the SCG state of the current SCG, which can be set to SCG inactive or SCG active. The current SCG is the SCG configured in UE120 when UE120 receives a CHO including an MR-DC configuration. The indication may be an indication in an MCG configuration or an SCG configuration (for example, generated by a network node acting as an SN). - When the execution conditions are met, select a target candidate and apply the target candidate configuration, including the selected target candidate MCG and SCG configurations. - Set the SCG status of the selected target candidate to inactive, - Applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending RRCReconfigurationComplete to the first network node, and performing further actions according to the SCG state of the selected target candidate SCG, including: In some embodiments, sending RRCReconfigurationComplete indicates that the conditions in UE120 have been met and that UE120 has applied the target configuration. ** It supports sending RRCReconfigurationComplete which includes RRCReconfigurationComplete ** The data is transferred from MN to SN, and UE120 is using the deactivated SCG state. In some embodiments, once the state is determined, the UE120 does not trigger random access to the selected target SCG. In some embodiments, once the state is determined, UE120 triggers random access to the selected target SCG only if explicitly indicated by the network (for example, if the network wants UE120 to prepare for faster activation later). In other words, even if an SCG is changed to a deactivated SCG, UE120 will be ready to activate the SCG immediately afterward by performing random access.

[0129] In a series of embodiments, some embodiments are, Source MN111 This includes the method of execution. This relates to the method executed by the first network node 111 described above and can be incorporated into this method. The method is - A message is sent to target candidate MN112 requesting the configuration of a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG or can be deactivated. ○ In some embodiments, the message is a HANDOVER REQUEST message. ○In some embodiments, the current SCG configuration is included in the SN configuration within HandoverPreparationInformation. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. - Receiving a message from target candidate MN112 including a CHO with an MR-DC configuration, the MR-DC configuration including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by UE120 when the execution conditions monitored by UE120 upon receipt of the CPC configuration are met, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to inactive. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. -Send an RRCReconfiguration message to UE120 including the configuration of the CHO with MR-DC, -Includes receiving RRCReconfigurationComplete from UE120, indicating that a CHO with MR-DC has been configured.

[0130] Some embodiments include, Target MN112 This includes the method of execution. This relates to the method performed by the second network node 112 described above and can be incorporated into this method. The method is - A message is sent to target candidate SN113 requesting the configuration of a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○ In some embodiments, the message is an S-NODE ADDITION REQUEST message. ○In some embodiments, the current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG. ○In some embodiments, target MN112 decides to configure UE120 using MR-DC in the CHO configuration. - Receiving a message from target candidate SN113 containing an SCG configuration which includes one or more target candidate SCG configurations, each target candidate SCG configuration being applied by UE120 when the execution conditions monitored by UE120 are met upon receipt of the CHO configuration, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to inactive. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - A response message indicating that a CHO with MR-DC has been configured, such as HANDOVER REQUEST ACKNOWLEDGE, is sent to source MN111, - From UE120, RRCReconfigurationComplete to T-SN indicating that the conditions in UE120 have been met and UE120 has applied CHO with target configuration and MR-DC configuration. ** Receiving an RRCReconfigurationComplete message that includes, -RRCReconfigurationComplete ** To forward the message to T-SN113, - This includes setting the SCG status of UE120 to inactive.

[0131] Some embodiments include, Target candidate SN113 This includes the method of execution. This relates to the method executed by the third network node 113 described above and can be incorporated into this method. The method is - Receiving a message from target MN112 requesting an SCG configuration for a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. ○The message contains information about the current SCG status of UE120. - RRCReconfiguration including UE120 target configuration ** Sending a message containing the following to the master node (MN), for example, MN111 or MN112, ○The message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to inactive. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - RRCReconfigurationComplete indicates that UE120 has performed a conditional handover. ** Receiving a message from target MN112, - This includes setting the SCG status of UE120 to inactive.

[0132] UE120 keeps the SCG status of SCG target candidates always active.

[0133] In a series of embodiments, some embodiments are, By UE120 or, for example, source MN111 This includes the method of execution. This relates to the method of execution by UE120 or, for example, the aforementioned source MN111, and can be incorporated into this method. The method is -Having an MR-DC configuration in which the SCG state can be set to active or inactive, -Receive a CHO configuration from the network, which includes the MR-DC configuration, corresponding to an RRCReconfiguration message containing the CHO configuration with the MR-DC in the target configuration, and the CHO configuration is applied if the conditions are met (where the applied SCG message is RRCReconfiguration). ** This can be shown. In some embodiments, the CHO configuration includes a measurement configuration for an SCG such as SCG MeasConfig, which includes a reporting configuration for configuring measurement objects associated with the event of the execution condition and / or the frequency of the target candidate PSCell (e.g., SSB frequency, SSB ARFCN), and a measurement identifier referenced in the CHO configuration of the target candidate. -In response to the configuration of a CHO with MR-DC, send RRCReconfigurationComplete to the network, - Receiving an indication (e.g., an RRCReconfiguration message) from the network (e.g., from a network node operating as an MN or a network node operating as an SN) that indicates the SCG state (operating mode) and / or a change in the SCG state (operating mode), For example, if the state was activated, this could be an indication to change it to deactivated, and if the state was deactivated, this could be an indication to change it to activated. While UE120 is configured with a CHO with MR-DC and is monitoring the execution conditions of the CHO with MR-DC, UE120 may receive one or more indications to set the SCG state. In some embodiments, UE120 receives an indication before it is configured with a CHO accompanied by an MR-DC; that is, when UE120 is configured with a CHO, UE120 has already received an SCG status indication. In some embodiments, UE120 receives an indication after being configured with a CHO accompanied by MR-DC. In some embodiments, UE120 receives an indication when it is configured with a CHO with an MR-DC, i.e., in the same message in which UE120 is configured with a CHO with an MR-DC, UE120 also receives an indication of the SCG state. This may be one or more indications of the current SCG state, which can be set to SCG inactive or SCG active. The current SCG is the SCG configured in UE120 when UE120 receives a CHO with an MR-DC configuration. The indication may be an indication in an MCG configuration or an SCG configuration (for example, generated by a network node acting as an SN). - When the execution conditions are met, select a target candidate and apply the target candidate configuration, including the selected target candidate MCG and SCG configurations. - Set the SCG status of the selected target candidate to active, - Applying the target candidate SCG configuration of the selected target candidate SCG (the target SCG may be the same as the source SCG), sending RRCReconfigurationComplete to the first network node, and performing further actions according to the determined SCG state of the selected target candidate SCG, including: In some embodiments, sending RRCReconfigurationComplete indicates that the conditions in UE120 have been met and that UE120 has applied the target configuration. ** It supports sending RRCReconfigurationComplete which includes RRCReconfigurationComplete ** This is transferred from MN to SN. UE120 is using the activated SCG state. In some embodiments, once the state is determined, the UE120 triggers random access to the selected target SCG.

[0134] In a series of embodiments, some embodiments are, Source MN111This includes the method of execution. This relates to the method executed by the first network node 11 described above and can be incorporated into this method. The method is - A message is sent to target candidate MN112 requesting the configuration of a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○ In some embodiments, the message is a HANDOVER REQUEST message. ○In some embodiments, the current SCG configuration is included in the SN configuration within HandoverPreparationInformation. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. -Receive a message from target candidate MN112 including a CHO with an MR-DC configuration, the MR-DC configuration includes one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration is applied by UE120 when the execution conditions monitored by UE120 upon receipt of the CPC configuration are met, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. ○In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to active. ○In some embodiments, the target configuration of UE120 RRCReconfiguration **This does not include information about which SCG state to use. -Send an RRCReconfiguration message to UE120 including the configuration of the CHO with MR-DC, -Includes receiving RRCReconfigurationComplete from UE120, indicating that a CHO with MR-DC has been configured.

[0135] Some embodiments include, Target MN112 This includes the method of execution. This relates to the method performed by the second network node 112 described above and can be incorporated into this method. The method is - A message is sent to target candidate SN113 requesting the configuration of a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○ In some embodiments, the message is an S-NODE ADDITION REQUEST message. ○In some embodiments, the current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. ○In some embodiments, target MN112 decides to configure UE120 using MR-DC in the CHO configuration. - Receiving a message from target candidate SN113, which includes an SCG configuration comprising one or more target candidate SCG configurations, each target candidate SCG configuration being applied by UE120 when the execution conditions monitored by UE120 are met by the receipt of the CHO configuration, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to active. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - A response message indicating that a CHO with MR-DC has been configured, such as HANDOVER REQUEST ACKNOWLEDGE, is sent to source MN111, - From UE120, RRCReconfigurationComplete to T-SN indicating that the conditions in UE120 have been met and UE120 has applied CHO with target configuration and MR-DC configuration. ** Receiving an RRCReconfigurationComplete message that includes, - The RRCReconfigurationComplete message contains an indication of the current SCG status of UE120. ** This includes forwarding the message to target (T)-SN113.

[0136] Some embodiments include, Target candidate SN113This includes the method of execution. This relates to the method executed by the third network node 113 described above and can be incorporated into this method. The method is - Receiving a message from target MN112 requesting an SCG configuration for a CHO with an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○The message is an S-NODE ADDITION REQUEST message. ○The current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. ○The message contains information about the current SCG status of UE120. - RRCReconfiguration including UE120 target configuration ** Sending a message containing the following to MN, for example, MN111 or MN112, ○The message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the conditions are met and the target configuration RRCReconfiguration ** When this is applied, UE120 should always set the SCG state to active. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - RRCReconfigurationComplete indicates that UE120 has performed a conditional handover. ** Receiving a message from target MN112, - This includes setting the SCG status of UE120 to active.

[0137] UE120 sets the SCG state of the SCG target candidate to a pre-configured value.

[0138] This method includes the UE 120 setting the SCG state of the SCG target candidate to a value preconfigured by an MN such as MN 111, for example, active or inactive. The logic is to react to the target candidate MN 112 and / or the target candidate SN 113 according to the traffic evaluation after CHO execution, and probably deactivate the SCG after CHO execution. One of the advantages here is that it can function even when the target candidate does not support a deactivated SCG.

[0139] UE120 sets the SCG state of the SCG target candidate to the value configured in the CHO+MR-DC configuration.

[0140] When the configuration of the target candidate includes the SCG configuration, regardless of the current SCG state when the condition is met and the handover is executed, the SCG state of the target candidate is regarded as the state set by the SCG configuration, and actions are taken accordingly.

[0141] Source MN111 shows a change in the SCG state of candidate target MN112.

[0142] In a series of embodiments, some embodiments include Source MN111 the method to be executed. This is related to the method executed by the first network node 111 described above and can be incorporated into this method. The method is - sending a message to the target candidate MN 112 requesting the configuration of CHO with MR-DC configuration, the message including the current configuration of the UE 120, indicating that the UE 120 is configured using a deactivated SCG, or that it can be deactivated, and ○ In some embodiments, the message is a HANDOVER REQUEST message. ○ In some embodiments, the current SCG configuration is included in the SN configuration within the HandoverPreparationInformation. ○ In some embodiments, the message includes the current SCG state of UE120, e.g., an activated SCG, a deactivated SCG, which may be considered as part of the configuration of UE120. - Receive a message including a CHO with an MR-DC configuration from a target candidate MN112, the MR-DC configuration including one or more target candidate MCG and SCG configurations, each target candidate MCG and SCG configuration being applied by UE120 when the execution conditions monitored by UE120 due to receipt of a CPC configuration are satisfied, and each target candidate SCG configuration being within the SCG RRC reconfiguration message indicated by RRCReconfiguration ** and, ○ In some embodiments, the message is a HANDOVER REQUEST ACKNOWLEDGE message. ○ In some embodiments, the message includes an indication that UE120 is permitted (and / or required) to continue using the same SCG state as when the conditions are met and the target configuration RRCReconfiguration ** is applied. This indication may be an absence parameter whose presence indicates deactivation of the SCG. This indication may be an absence parameter whose presence indicates deactivation of the SCG and a second parameter indicating that UE120 can continue to use (and / or will continue to use) the current SCG state in the new SCG to which UE120 is applied. ○ In some embodiments, the target configuration RRCReconfiguration of UE120 ** does not include information on which SCG state to use. - Transmit an RRCReconfiguration message including the configuration of a CHO with MR-DC to UE120 - Receive an RRCReconfigurationComplete from UE120 indicating that a CHO with MR-DC has been configured -If there is a change in the SCG state of UE120 while configured with MR-DC (for example, if the SCG state changes from active to inactive, or if the SCG state changes from inactive to active), source MN111 sends a UE120-related message, such as UE120 CONFIGURATION UPDATE, to target candidate MN112 to inform it of the change in the current SCG state of UE120. ○In some embodiments, the source master node (MN) 111 receives a message from the target candidate master node (MN) 112 with an updated configuration for the CHO with MR-DC, such as a configuration having an updated SCG configuration, such as a different SCG state compared to the previous / current configuration, a configuration including a different SCG / PSCell / SN candidate, a CHO configuration without an MR-DC configuration, or an updated configuration for the CHO with MR-DC, such as a change in which an MR-DC (SCG) configuration has been added to a CHO configuration that previously did not include an MR-DC configuration. Configuration changes may also include changes to the corresponding execution conditions. The source master node (MN) 111 then sends an RRCReconfiguration message to the UE 120 and updates the CHO configuration accordingly, for example, by including the updated CHO with an MR-DC (or simply CHO) configuration in the UE 120.

[0143] Some embodiments include, Target MN112 This includes the method of execution. This relates to the method performed by the second network node 112 described above and can be incorporated into this method. The method is - A message is sent to target candidate SN113 requesting the configuration of a CHO having an MR-DC configuration, the message including the current configuration of UE120 and indicating that UE120 is configured with a deactivated SCG, or can be deactivated. ○ In some embodiments, the message is an S-NODE ADDITION REQUEST message. ○In some embodiments, the current SCG configuration is included in the target SN113 configuration within CG-ConfigInfo. ○In some embodiments, the message includes the current SCG state of the UE120, for example, activated SCG, deactivated SCG, which may be considered as part of the configuration of the UE120. ○In some embodiments, target MN112 decides to configure UE120 using MR-DC in the CHO configuration. - Receiving a message from target candidate SN113, which includes an SCG configuration comprising one or more target candidate SCG configurations, each target candidate SCG configuration being applied by UE120 when the execution conditions monitored by UE120 are met by the receipt of the CHO configuration, and each target candidate SCG configuration is RRCReconfiguration ** It is contained within the SCG RRC reconstruction message shown, ○ In some embodiments, the message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the message is that the conditions are met and the target configuration RRCReconfiguration ** This includes an indication that UE120 is permitted (and / or must continue to use) the same SCG state as when it was applied, which may be an absence parameter whose presence indicates the deactivation of the SCG, or an absence parameter whose presence indicates the deactivation of the SCG, and a second parameter indicating that UE120 can (and / will continue to use) the current SCG state in the new SCG to which it is applied. ○In some embodiments, the target configuration of UE120 RRCReconfiguration **This does not include information about which SCG state to use. - A response message indicating that a CHO with MR-DC has been configured, such as a HANDOVER REQUEST ACK, is sent to source MN111, - Receiving a message from the source master node (MN) 111 indicating a change in the current SCG state of UE120 (for example, that the SCG state of UE120 changed from active to inactive, or that the state of UE120 changed from inactive to active), ○In some embodiments, the target master node (MN) 112 sends a message to the target candidate secondary node (SN) 113 to notify that the current SCG state of the UE 120 has changed (for example, 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 of the CHO with an 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). ○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 having received information about the changed current state of the SCG and / or having received an updated SCG configuration from the target candidate secondary node (SN) 113. This may include a CHO configuration with an updated SCG configuration, such as a CHO configuration with a different SCG state compared to the previous / current configuration, a CHO configuration with a different SCG / PSCell / SN candidate, a CHO configuration without an MR-DC configuration, or a CHO configuration that previously did not include an MR-DC configuration but now includes an MR-DC (SCG) configuration. Configuration changes may also include changes to corresponding execution conditions, such as the SCG. The target master node (MN) 112 sends a message to the source master node (MN) 111 to inform it of the updated CHO configuration. ○In some embodiments, the target master node (MN) 112 stores information about the current SCG state of the UE 120. Then, a message (e.g., RRCReconfigurationComplete to T-SN113) is sent to the UE 120 indicating that the conditions within the UE 120 have been met and the UE 120 has applied the target configuration and the CHO with the MR-DC configuration. ** Upon receiving RRCReconfigurationComplete (including the above) from UE120, an indication of the current SCG state is forwarded to the target candidate secondary node (SN) 113. - From UE120, RRCReconfigurationComplete to T-SN indicating that the conditions in UE120 have been met and UE120 has applied CHO with target configuration and MR-DC configuration. ** Receiving an RRCReconfigurationComplete message that includes, - The RRCReconfigurationComplete message contains an indication of the current SCG status of UE120. ** This includes forwarding the message to T-SN113.

[0144] Some embodiments include, Target candidate SN113 This includes the method of execution. This relates to the method executed by the third network node 113 described above and can be incorporated into this method. The method is - Receiving a message from the target master node (MN) 112 requesting configuration for the SCG of the CHO having an MR-DC configuration, the message including the current configuration of UE 120 and indicating that 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 included in the target SN113 configuration within CG-ConfigInfo. ○The message contains information about the current SCG status of UE120. - RRCReconfiguration including UE120 target configuration ** Sending a message containing the following to the master node (MN): ○The message is an S-NODE ADDITION REQUEST ACK message. ○In some embodiments, the message is that the conditions are met and the target configuration RRCReconfiguration ** This includes an indication that UE120 is allowed to continue using the same SCG state as when the condition was applied. ○In some embodiments, the target configuration of UE120 RRCReconfiguration ** This does not include information about which SCG state to use. - This includes receiving a message from target MN112 indicating that the current SCG state of UE120 has changed (e.g., from inactive to active, or from active to inactive). - In some embodiments, the target candidate secondary node (SN) 113 determines to update the SCG configuration of the CHO configuration of the UE 120 and transmits a message including the updated configuration to the target MN 112. The change in the SCG configuration may include, for example, that one or more PSCell (SCG) configurations are no longer part of the CHO configuration. For example, the CHO configuration that was previously included in the SCG (MR-DC) configuration no longer includes such a configuration, or a PSCell (SCG) configuration is added to the CHO configuration.

[0145] Source MN111 shows a change in the SCG state of candidate target MN112 after CHO execution.

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

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

[0148] Example Implementation An implementation example of the above solution showing the addition underlined in 3GPP (registered trademark) TS38.331 v15.4.1 is provided below.

[0149] RRCReconfiguration The RRCReconfiguration message is a command for changing the RRC connection. It can transmit information regarding 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] An example implementation of the above embodiment, which shows the underlined additions to 3GPP(registered trademark) TS38.423v16.6.0, is provided below.

[0153] RRCReconfigurationComplete ** An example of S-NODE reconfiguration completion is shown, which includes information about the current SCG status of UE120, and is forwarded to T-SN, for example, T-SN112, in the same message.

[0154] 9.1.2.4 S-NODE reconfiguration complete This message indicates that the configuration requested by the S-NG-RAN node has been applied by UE120, or To provide the current SCG activation status of UE120 For example, the data is transmitted by an M-NG-RAN node such as MN112 to an S-NG-RAN node such as SN113. 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, which contains information about the current SCG status of UE120.

[0157] 9.1.2.xxx UE configuration update This message is sent, for example, 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, providing an updated configuration for a UE such as UE120. Direction: Source NG-RAN node → Target NG-RAN node

[0158] [Table 9]

[0159] Figures 17a and 17b show an example of the configuration in UE120 or source MN111.

[0160] The UE120 or source MN111 may include an input / output interface 1700 configured to communicate with, for example, any network entity operating within the wireless communication network 100 of this 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] UE120 or source MN111 may comprise any one or more of the acquisition and transmission units that perform the actions described herein, for example, actions 1201 to 1204 above. These units are further described in the following exemplary embodiments.

[0162] This embodiment can be implemented by each processor or one or more processors, such as at least one processor 1760 in the processing circuit of the UE120 or source MN111 shown in Figure 17a, and computer program code that performs the functions and actions of the embodiment herein. The program code may also be provided as a computer program product, for example, in the form of a data carrier that carries the computer program code that performs this embodiment when loaded into the UE120 or source MN111. One form of such carrier is a CD-ROM disk. However, other data carriers such as a memory stick are also possible. The computer program code is also provided as pure program code on a server and downloaded into the UE120 or source MN111.

[0163] The UE120 or source MN111 may further include a memory 1770 comprising one or more memory units. The memory 1770 contains instructions that can be executed by the processor in the UE120 or source MN111. The memory 1770 is configured to be used, for example, to store instructions, data, configurations, and applications for performing the method described herein when executed in the UE120 or source MN111.

[0164] In some embodiments, the computer program 1780, when executed by at least one processor 1760, includes instructions that cause at least one processor 1760 of the UE120 or source MN111 to perform the above action.

[0165] In some embodiments, each carrier 1790 has its own computer program 1780, and the carrier 1790 is one of the following: 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] Those skilled in the art will also understand that the following functional modules within UE120 or source MN111 may refer to one or more processors comprising a combination of analog and digital circuits, and / or software and / or firmware, for example, the software and / or firmware stored in UE120 or source MN111 and executed by one or more processors, such as the aforementioned at least one processor 1760, causing 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 contained in a single application-specific integrated circuit (ASIC), or they may be individually packaged or assembled into a system-on-a-chip (SoC), and multiple processors and various digital hardware may be distributed across various individual components.

[0167] Figures 18a and 18b show an example of the configuration at the first network node 111 or source MN111.

[0168] The first network node 111 or source MN111 may include, for example, an input / output interface 1800 configured to communicate with any of the network entities operating within the wireless communication network 100 of this embodiment. The input / output interface 1800 may include, for example, 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 source MN 111 may include, for example, one or more of the configuration units, transmission units, and trigger units that perform method actions described herein, such as actions 1301 to 1303 described above. These units are further described in the following exemplary embodiments.

[0170] This embodiment can be implemented by each processor or one or more processors, such as at least one processor 1860 in the processing circuit of the first network node 111 or source MN111 shown in Figure 18a, and computer program code that performs the functions and actions of the embodiment herein. The program code can also be provided as a computer program product, for example, in the form of a data carrier that carries the computer program code that performs this embodiment when loaded into the first network node 111 or source MN111. One form of such carrier is a CD-ROM disk. However, other data carriers such as a memory stick are also possible. The computer program code can also be provided as pure program code on a server and downloaded to the first network node 111 or source MN111.

[0171] The first network node 111 or source MN111 may further include a memory 1870 comprising one or more memory units. The memory 1870 contains instructions that can be executed by a processor in the first network node 111 or source MN111. The memory 1870 is configured to be used for storing instructions, data, configurations, and applications for performing the method described herein when executed on the first network node 111 or source MN111.

[0172] In some embodiments, the computer program 1880, when executed by at least one processor 1860, includes instructions that cause at least one processor 1860 of the first network node 111 or source MN111 to perform the above action.

[0173] In some embodiments, each carrier 1890 has its own computer program 1880, and the carrier 1890 is one of the following: 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 understand that the following functional modules within the first network node 111 or source MN111 may refer to one or more processors comprising a combination of analog and digital circuits, and / or software and / or firmware, for example, the software and / or firmware stored in the first network node 111 or source MN111 and executed by one or more processors, such as the aforementioned at least one processor 1860, causing each of the at least one processor 1860 to perform an action according to any of the above actions. One or more of these processors, and other digital hardware, may be contained in a single application-specific integrated circuit (ASIC), or they may be individually packaged or assembled into a system-on-a-chip (SoC), and multiple processors and various digital hardware may be distributed across various individual components.

[0175] Figures 19a and 19b show an example configuration at the second network node 112 or target MN112.

[0176] The second network node 112 or target MN112 may include an input / output interface 1900 configured to communicate with, for example, any network entity operating within the wireless communication network 100 of this embodiment. The input / output interface 1900 may include, for example, 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 target MN112 may include, for example, one or more of the receiving unit, responding unit, setting unit, activation unit, and deactivation unit that perform method actions described herein, such as action 1401. These units are further described in the following exemplary embodiments.

[0178] This embodiment can be implemented by each processor or one or more processors, such as at least one processor 1960 in the processing circuit of the second network node 112 or target MN112 as shown in Figure 19a, and computer program code that performs the functions and actions of the embodiment herein. The program code may also be provided as a computer program product, for example, in the form of a data carrier that carries the computer program code that performs this embodiment when loaded into the second network node 112 or target MN112. One form of such carrier is a CD-ROM disk. However, other data carriers such as a memory stick are also possible. The computer program code is also provided as pure program code on a server and downloaded to the second network node 112 or target MN112.

[0179] The second network node 112 or target MN112 may further include a memory 1970 comprising one or more memory units. The memory 1970 contains instructions that can be executed by a processor in the second network node 112 or target MN112. The memory 1970 is configured to be used for storing instructions, data, configurations, and applications for performing the method described herein when executed on the second network node 112 or target MN112.

[0180] In some embodiments, the computer program 1980, when executed by at least one processor 1960, includes instructions that cause at least one processor 1960 of the second network node 112 or target MN112 to perform the above action.

[0181] In some embodiments, each carrier 1990 has its own computer program 1980, and the carrier 1990 is one of the following: 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 understand that the following functional modules within the second network node 112 or target MN112 may refer to one or more processors comprising a combination of analog and digital circuits and / or software and / or firmware, for example, the software and / or firmware stored in the second network node 112 or target MN112 and executed by one or more processors such as the aforementioned at least one processor 1960, causing each of the at least one processor 1960 to perform an action according to any of the above actions. One or more of these processors, and other digital hardware, may be contained in a single application-specific integrated circuit (ASIC), or they may be individually packaged or assembled into a system-on-a-chip (SoC), and multiple processors and various digital hardware may be distributed across various individual components.

[0183] Figures 20a and 20b show an example of the configuration at the third network node 113 or target SN113.

[0184] The third network node 113 or target SN113 may include, for example, an input / output interface 2000 configured to communicate with any of the network entities operating within the wireless communication network 100 of this embodiment. The input / output interface 2000 may include, for example, 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, for example, one or more of the receiving unit, responding unit, setting unit, activation unit, and deactivation unit that perform method actions described herein, such as action 1504 above. These units are further described in the following exemplary embodiments.

[0186] This embodiment can be implemented by each processor or one or more processors, such as at least one processor 2060 in the processing circuit of the third network node 113 or target SN113 as shown in Figure 20a, and computer program code that performs the functions and actions of the embodiment herein. The program code may also be provided as a computer program product, for example, in the form of a data carrier that carries the computer program code that performs this embodiment when loaded into the third network node 113 or target SN113. One form of such carrier is a CD-ROM disk. However, other data carriers such as a memory stick are also possible. The computer program code is also provided as pure program code on a server and downloaded to the third network node 113 or target SN113.

[0187] The third network node 113 or target SN113 may further include a memory 2070 comprising one or more memory units. The memory 2070 contains instructions that can be executed by a processor in the third network node 113 or target SN113. The memory 2070 is configured to be used for storing instructions, data, configurations, and applications for performing the method described herein when executed on the third network node 113 or target SN113.

[0188] In some embodiments, the computer program 2080, when executed by at least one processor 2060, includes instructions that cause at least one processor 2060 of the third network node 113 or target SN113 to perform the above action.

[0189] In some embodiments, each carrier 2090 has its own computer program 2080, and the carrier 2090 is one of the following: 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] Those skilled in the art will also understand that the following functional modules within the third network node 113 or target SN113 may refer to one or more processors comprising a combination of analog and digital circuits and / or software and / or firmware, for example, the software and / or firmware stored in the third network node 113 or target SN113 and executed by one or more processors such as the aforementioned at least one processor 2060, causing each of the at least one processor 2060 to perform an action according to any of the above actions. One or more of these processors, and other digital hardware, may be contained in a single application-specific integrated circuit (ASIC), or they may be individually packaged or assembled into a system-on-a-chip (SoC), and multiple processors and various digital hardware may be distributed across various individual components.

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

[0192] Several exemplary embodiments 1 to 22 are briefly described below. 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 device (UE) 120, also called a wireless device or wireless terminal, or, for example, a source MN111, to indicate a secondary cell group (SCG) state during a conditional handover (CHO) within a wireless communication network 100, wherein the UE 120 is, for example, comprised of the current SCG, and the method is, for example, The process involves obtaining the conditional handover (CHO) configuration of UE120 from source MN111, wherein the CHO configuration includes the configurations of target candidate nodes 112 and 113, and target candidate nodes 112 and 113 include any one or more of the target candidate master node (MN) 112 and target candidate secondary node (SN) 113. For example, a method that includes sending an indication to target candidate nodes 112 and 113 that, when a CHO execution condition related to the CHO configuration is met, the SCG state is set to either SCG active or SCG inactive.

[0194] Embodiment 2: A method according to Embodiment 1, wherein the SCG state is set according to either the current SCG state or a target SCG state.

[0195] Embodiment 3: The method according to Embodiment 1 or 2, further, For example, obtaining the current SCG state, which means that UE120 has the SCG state when the CHO execution starts, includes receiving, for example, the current SCG state is set to either SCG active or SCG inactive, for example, for a source SN which may be the same node as the target SN, since the same PSCell / SCG is maintained in the HO. A method for setting the target SCG state to SCG active or SCG inactive, initiating an indication to target candidate nodes 112, 113 which indicates the current SCG state, and initiating an indication which is initiated by selected target candidate nodes 112, 113 which include any one or more of target candidate MN112 and / or target candidate SN113.

[0196] This could mean, for example, that as part of applying a CHO configuration in the SCG, the SCG state is set toward the target SN, and UE120 and target network nodes 112 and 113 operate accordingly.

[0197] Embodiment 4: The method according to Embodiment 1 or 2, For example, the target SCG state, - Always inactive, - Always active, -For example, a value pre-configured as active or inactive by source MN111, -The latest SCG state that UE120 has when CHO is executed is obtained by setting it to one of the following, for example, the current SCG state. Indication to target candidate nodes 112 and 113 indicates the target SCG state.

[0198] Embodiment 5: A computer program that, when executed on a processor, includes instructions that cause the processor to perform any one of Embodiments 1 to 4.

[0199] Embodiment 6: A carrier comprising the computer program described in Embodiment 5, A carrier is one of the following: 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.

[0200] Embodiment 7: A method performed by a first network node 111 acting as a source master node (MN) 111 to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein the UE 120 is configured, for example, with the current SCG, and the method is, for example, This includes sending a conditional handover CHO configuration for UE120 to UE120, the CHO configuration including the configurations of target candidate nodes 112 and 113, where target candidate nodes 112 and 113 include any one or more of the target candidate master node (MN) 112 and target candidate secondary node (SN) 113. The CHO configuration is a method that, when the CHO execution conditions associated with the CHO configuration are met, triggers, for example, UE120 to send an indication to target candidate nodes 112, 113 that the SCG state is set to either SCG active or SCG inactive.

[0201] Embodiment 8: A method relating to Embodiment 7, wherein the SCG state includes one of the current SCG state and / or the target SCG state.

[0202] Embodiment 9: The method according to Embodiment 7 or 8, further, This includes sending the current SCG state, which is set to one of SCG active or SCG inactive, to UE120. A method for setting the target SCG state to SCG active or SCG inactive, initiating an indication to target candidate nodes 112, 113 which indicates the current SCG state, and initiating an indication which is initiated by selected target candidate nodes 112, 113 which include any one or more of target candidate MN112 and / or target candidate SN113.

[0203] Embodiment 10: The method according to Embodiment 7 or 8, - Always inactive, - Always active, - A value pre-configured as active or inactive, -The latest SCG state that UE120 has when CHO is executed, Configure UE120 in one of the target SCG states, Indication is a method of indicating the target SCG state.

[0204] Embodiment 11: A computer program that, when executed on a processor, includes instructions that cause the processor to perform any one of Embodiments 7 to 10.

[0205] Embodiment 12: A carrier comprising the computer program described in Embodiment 11, A carrier is one of the following: 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.

[0206] Embodiment 13: A method performed by a second network node 112 acting as a target master node (MN) 112 to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein the UE 120 is configured, for example, with the current SCG, and the method is, for example, A method that includes receiving an indication from UE120 indicating an SCG state set to either SCG active or SCG inactive when the CHO execution conditions related to the CHO configuration are met.

[0207] Embodiment 14: The method according to Embodiment 13, A method in which the SCG state includes either the current SCG state or / or the target SCG state.

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

[0209] Embodiment 16: The method according to Embodiment 13 or 14, If the indication shows a target SCG state including inactivity, the SCG will be activated in response to the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution. If the indication shows a target SCG state including Active, then, in response to the traffic evaluation after the CHO execution, the SCG will likely be deactivated after the CHO execution. If the indication shows a target SCG state that includes a pre-configured value as active or inactive, the SCG will be deactivated in response to the traffic evaluation after the CHO execution, A method that includes any one of the following.

[0210] Embodiment 17: A computer program that, when executed on a processor, includes instructions that cause the processor to perform any one of Embodiments 13 to 16.

[0211] Embodiment 18: A carrier comprising the computer program described in Embodiment 17, A carrier is one of the following: 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.

[0212] Embodiment 19: A method performed by a third network node 113 acting as a target secondary node (SN) 113 to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein the UE 120 is configured, for example, with the current SCG, and the method is, for example, For example, a method that includes receiving an indication from UE120 indicating an SCG state set to either SCG active or SCG inactive when a CHO execution condition related to the CHO configuration is met.

[0213] Embodiment 20: The method according to Embodiment 19, A method in which the SCG state includes either the current SCG state or / or the target SCG state.

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

[0215] Embodiment 22: The method according to Embodiment 19 or 20, If the indication shows a target SCG state including inactivity, the SCG will be activated in response to the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution. If the indication shows a target SCG state including Active, then, in response to the traffic evaluation after the CHO execution, the SCG will likely be deactivated after the CHO execution. If the indication shows a target SCG state that includes a pre-configured value as active or inactive, the SCG will be deactivated in response to the traffic evaluation after the CHO execution, A method that includes any one of the following.

[0216] Embodiment 23: A computer program that, when executed on a processor, includes instructions that cause the processor to perform any one of Embodiments 19 to 22.

[0217] Embodiment 24: A carrier comprising the computer program described in Embodiment 23, A carrier is one of the following: 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.

[0218] Embodiment 25: A user device (UE) 120 or source master node (MN) 111, also called a wireless device or wireless terminal, configured to indicate a secondary cell group (SCG) state during a conditional handover (CHO) in a wireless communication network 100, wherein the UE 120 or the source MN 111 is configured, for example, with the current SCG, and the UE 120 or source MN 111 is further configured, for example, The acquisition of a conditional handover (CHO) configuration of UE120 from source MN111 by means of the acquisition unit of UE120 or source MN111, wherein the CHO configuration is adapted to include the configurations of target candidate nodes 112 and 113, and target candidate nodes 112 and 113 are arranged to include any one or more of target candidate master node (MN) 112 and target candidate secondary node (SN) 113. For example, once the CHO execution conditions related to the CHO configuration are met, the means of the UE120 or the source MN111's transmission unit transmit an indication to the target candidate nodes 112 and 113 that is adapted to indicate an SCG state set to either SCG active or SCG inactive. The UE or source MN is further configured to perform the following actions.

[0219] Embodiment 26: The UE120 or source MN described in Embodiment 26, The SCG state is adapted to be set according to either the current SCG state or the target SCG state, for the UE or source MN.

[0220] Embodiment 27: The UE120 or source MN111 described in Embodiment 25 or 26, further, for example, For example, the system is further configured to receive the current SCG state, which is configured to be set to either SCG active or SCG inactive, by means of the acquisition unit of UE120 or source MN111. Indications to target candidate nodes 112 and 113 are adapted to indicate the current SCG state, and the indications set the target SCG state to SCG active or SCG inactive, for example, initiated by selected target candidate nodes 112 and 113, which include any one or more of target candidate MN112 and / or target candidate SN113, UE or source MN.

[0221] Embodiment 28: A UE120 or source MN111 according to any one of Embodiments 25 to 27, further comprising, for example, means of an acquisition unit of the UE120 or source MN111, - Always deactivate, - Always keep it active, -For example, a value pre-configured as activated or deactivated by source MN111, -The latest SCG state that UE120 has when CHO is executed, for example, the current SCG state and It is further configured to be obtained by setting it to one of the following: The indications to target candidate nodes 112 and 113 are adapted to indicate the target SCG state, either for the UE or source MN.

[0222] Embodiment 29: A first network node 111 operating as a source master node (MN) 111 configured to process secondary cell group (SCG) states during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein, for example, the UE 120 is configured to consist of the current SCG, and the first network node 111 further, for example, The means of the transmitting unit of the first network node 111 are configured to transmit a conditional handover (CHO) configuration of UE 120, wherein the CHO configuration is adapted to include the configurations of target candidate nodes 112 and 113, and target candidate nodes 112 and 113 are configured to include any one or more of target candidate master node (MN) 112 and target candidate secondary node (SN) 113. For example, the CHO configuration is adapted so that, when the CHO execution conditions related to the CHO configuration are met, the CHO configuration is adapted so that the UE 120 is triggered by the trigger unit of the first network node 111, for example, by the means of the transmission unit of the first network node 111, to send an indication adapted to show an SCG state set to either SCG active or SCG inactive to target candidate nodes 112, 113, for example, by the means of the transmission unit of the first network node 111.

[0223] Embodiment 30: The first network node 111 described in Embodiment 29, The SCG state of the first network node is adapted to include either the current SCG state or / or the target SCG state.

[0224] Embodiment 31: A first network node 111 according to any one of Embodiments 29 to 30, further, For example, the transmission unit of the first network node 111 is configured to transmit to the UE 120 the current SCG state, which is adapted to be set to either SCG active or SCG inactive. Indications to target candidate nodes 112 and 113 are adapted to indicate the current SCG state, and the indications set the target SCG state to SCG active or SCG inactive, and are initiated by selected target candidate nodes 112 and 113, for example, one or more of target candidate MN112 and / or target candidate SN113, to a first network node.

[0225] Embodiment 32: A first network node 111 according to any one of Embodiments 29 to 31, further, For example, by means of the constituent units of the first network node 111, - Always deactivate, - Always keep it active, - A value pre-configured as active or inactive, - Configure UE120 with the latest SCG state it has when CHO is executed, and a target SCG state set to one of the following: The indication is the first network node, which shows the target SCG status.

[0226] Embodiment 33: A second network node 112 operating as a target master node (MN) 112 configured to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein the UE 120 is adapted to, for example, the current SCG, and the second network node 112 further... For example, a second network node is further configured to receive an indication from UE120, adapted to indicate an SCG state set to either SCG active or SCG inactive, by means of the receiving unit of the second network node 112, when adapted to satisfy the CHO execution conditions related to the CHO configuration.

[0227] Embodiment 34: The second network node 112 described in Embodiment 33, The SCG state of the second network node is adapted to include either the current SCG state or / or the target SCG state.

[0228] Embodiment 35: A second network node 112 according to Embodiment 33 or 34, further, If the indication is adapted to show the current SCG state, for example, the second network node 112 is configured, by means of the configuration unit of the second network node 112, to set the target SCG state to SCG active or SCG inactive based on the indication.

[0229] Embodiment 36: A second network node 112 according to any one of embodiments 33 to 35, further comprising: If the indication is adapted to show a target SCG state including inactivity, then, for example, the means of the reaction unit of the second network node 112 will react, and for example, the means of the activation unit of the second network node 112 will activate the SCG after the CHO execution in accordance with the traffic evaluation after the CHO execution. If the indication is adapted to show a target SCG state including Active, then, for example, the means of the reaction unit of the second network node 112 will react, and, for example, the means of the deactivation unit of the second network node 112 will, in response to the traffic evaluation after the CHO execution, will probably deactivate the SCG after the CHO execution. If the indication is adapted to show a target SCG state including a pre-configured value as active or inactive, then, for example, by means of the reaction unit of the second network node 112, and for example, by means of the deactivation unit of the second network node 112, the SCG after the execution of the CHO may be deactivated in response to the traffic evaluation after the execution of the CHO. A second network node configured to perform one of the following actions.

[0230] Embodiment 37: A third network node 113 operating as a target secondary node (SN) 113 configured to process secondary cell group (SCG) states during a conditional handover (CHO) to a user device (UE) 120 of a wireless communication network 100, wherein the UE 120 is adapted to, for example, the current SCG, and the third network node 113 further... For example, a third network node is further configured to receive an indication from UE120, adapted to indicate an SCG state set to either SCG active or SCG inactive, by means of the receiving unit of the third network node 113, when adapted to satisfy the CHO execution conditions related to the CHO configuration.

[0231] Embodiment 38: A third network node as described in Embodiment 37, A third network node whose SCG state is adapted to include either the current SCG state or / or the target SCG state.

[0232] Embodiment 39: A third network node 113 according to Embodiment 37 or 38, further, If the indication indicates the current SCG state, the third network node is configured, for example, by means of the configuration unit of the third network node, to set the target SCG state to SCG active or SCG inactive based on the indication.

[0233] Embodiment 40: A third network node 113 according to any one of Embodiments 37 to 39, further, If the indication is adapted to show a target SCG state including inactivity, then, for example, the means of the reaction unit of the third network node 113 will react, and for example, the means of the activation unit of the third network node 113 will activate the SCG after the CHO execution in accordance with the traffic evaluation after the CHO execution. If the indication is adapted to show a target SCG state including Active, then, for example, the means of the reaction unit of the third network node 113 will react, and for example, the means of the deactivation unit of the third network node 113 will deactivate the SCG after the execution of the CHO in accordance with the traffic evaluation after the execution of the CHO. If the indication is adapted to show a target SCG state including a pre-configured value as active or inactive, then, for example, by means of the reaction unit of the third network node 113, and for example, by means of the deactivation unit of the third network node 113, the SCG after the execution of the CHO may be deactivated in response to the traffic evaluation after the execution of the CHO. A third network node configured to perform one of the following actions.

[0234] Abbreviations and Explanations 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 Aggregation CE control element CHO Conditional Handover CN Core Network CPA conditional PSCell addition CPC Conditional PSCell Modification CP control plane CQI Channel Quality Information C-RNTI Cell Radio Network Temporary Identifier CSI Channel Status Information DC Dual Connection DCI Downlink Control Information DL Downlink DRB Data Wireless Bearer eNB (EUTRAN) base station E-RAB EUTRAN Wireless Access Bearer E-UTRA Advanced General-Purpose Terrestrial Wireless Access E-UTRAN Advanced General-Purpose Terrestrial Wireless Access Network FDD Frequency Division Duplexing gNB NR base station GTP-U GPRS Tunneling Protocol - User Plane IE information elements IP Internet Protocol LTE Long-Term Evolution MCG Mastercell Group MAC Media Access Control MAC Complete MAC Control element MeNB Master eNB MgNB Master gNB MN Master Node MR-DC Multi-Wireless Dual Connection NACK (Negative Acknowledgment) NAS Non-Access Stratum NG-RAN Next Generation Wireless Access Network Ng-eNB Next-Generation Advanced 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 Wireless Bearer RLC Wireless Link Control RLF Wireless Link Failure RRC (Radio Resource Control) SCell Secondary Cell SCG Secondary Cell Group SCTP Stream Controlled Transmission Protocol SeNB SecondaryeNB SgNB docigNB SINR (Signal-to-Interference Ratio) SN Secondary Node SR scheduling request SRB Signaling Radio Bearer S-SN Source Secondary Node SUL Auxiliary Ascent Link Primary cell and special cell of a SpCell master or secondary cell group. TAT Timing Alignment Timer TDD time division duplex TEID (Tunnel Termination Identifier) TNL Transport Network Layer T-SN Target Secondary Node

[0235] Further expansion and variations Referring to Figure 21 according to one embodiment, the communication system includes a communication network 3210 such as a wireless communication network 100 such as a 3GPP® type cellular network, which includes an access network 3211 such as an IoT network, WLAN, or wireless access network, and a core network 3214. The access network 3211 includes a plurality of base stations 3212a, 3212b, 3212c such as first, second, and third network nodes 111, 112, 113, access nodes, AP STA NB, eNB, gNB, 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 UE120 such as a non-AP STA 3291 located in coverage area 3213c, is configured to wirelessly connect to or be paged by a corresponding base station 3212c. A second UE 3292, for example, a UE120 such as a non-AP STA located in coverage area 3213a, can wirelessly connect to a 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 a coverage area or where a single UE is connected to a corresponding base station 3212.

[0236] The communication network 3210 itself is connected to a host computer 3230, which may be embodied by standalone server, cloud implementation server, distributed server hardware and / or software, or as a processing resource in a server farm. The host computer 3230 may be owned or under the control of a service provider, or may be operated by or on behalf of a service provider. The connections 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 via an optional intermediate network 3220. The intermediate network 3220 may be one or more combinations of public, private, or hosted networks, and the intermediate network 3220 (if any) may be a backbone network or the internet, and in particular, the intermediate network 3220 may have two or more subnetworks (not shown).

[0237] The communication system in Figure 21, as a whole, enables a connection between one of the connected UEs 3291, 3292 and the host computer 3230. The connectivity can 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 over the OTT connection 3250 using the access network 3211, the core network 3214, an optional intermediate network 3220, and possible further infrastructure as intermediaries (not shown). The OTT connection 3250 can be transparent in the sense that participating communication devices through which the OTT connection 3250 passes are unaware of the routing of uplink and downlink communications. For example, base station 3212 is not notified of, or does not need to be notified of, the past routing of incoming downlink communications with data originating from host computer 3230 that is forwarded (e.g., handed over) to connected UE 3291. Similarly, base station 3212 does not need to be aware of the future routing of outgoing uplink communications from UE3291 to host computer 3230.

[0238] An exemplary implementation of the UE, base station, and host computer described in the preceding paragraph, according to one embodiment, will be described with reference to Figure 22. In the communication system 3300, the host computer 3310 includes hardware 3315, including a communication interface 3316 configured to set up and maintain wired or wireless connections to the interfaces of different communication devices of the communication system 3300. The host computer 3310 further includes a processing circuit 3318 which may have storage and / or processing capabilities. In particular, the processing circuit 3318 may include one or more programmable processors, application-specific integrated circuits, field-programmable gate arrays, or a combination thereof (not shown) adapted to execute instructions. The host computer 3310 further includes 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 capable of operating to serve remote users, such as the UE3330, which connect via an OTT connection 3350 terminated at the UE3330 and the host computer 3310. When serving remote users, the host application 3312 may provide user data transmitted using the OTT connection 3350.

[0239] The communication system 3300 further includes a base station 3320 equipped with hardware 3325 that is provided in the communication system and enables 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 the 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) where the base station 3320 provides service. 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 the core network of the communication system (not shown in Figure 22) and / or one or more intermediate networks outside 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 a combination thereof (not shown) adapted to execute instructions. The base station 3320 further comprises internally stored software 3321 or software 3321 accessible via an external connection.

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

[0241] It should be noted that the host computer 3310, base station 3320, and UE3330 shown in Figure 22 may be identical to the host computer 3230, one of the base stations 3212a, 3212b, and 3212c, and one of the UE3291 and 3292, respectively, in Figure 21. In other words, the internal operation of these entities will be as shown in Figure 22, and independently, the surrounding network topology may be as shown in Figure 21.

[0242] In Figure 22, the OTT connection 3350 is depicted abstractly to illustrate communication between the host computer 3310 and the radio device 3330 via the base station 3320, without explicitly referring to the intermediate devices and the precise routing of messages through these devices. The network infrastructure may determine the routing, and the routing may be configured to be hidden from the service provider operating the UE 3330 or the host computer 3310, or both. While the OTT connection 3350 is active, the network infrastructure may make further decisions to dynamically change the routing (for example, based on considerations or reconfiguration of the network load balancing).

[0243] The radio connection 3370 between the UE3330 and the base station 3320 follows the teachings of the embodiments described throughout this disclosure. One or more different embodiments improve the performance of the OTT service provided to the UE3330 by using an OTT connection 3350 in which the radio connection 3370 forms the final segment. More precisely, the teachings of these embodiments can improve applicable RAN effects, namely data rate, latency, and power consumption, thereby providing corresponding effects on the OTT service, such as reduced user latency, relaxed file size limitations, better responsiveness, and extended battery life.

[0244] Measurement procedures may be provided for the purpose of monitoring data rate, latency, and other factors that one or more embodiments improve. Furthermore, there may be optional network functions for reconfiguring the OTT connection 3350 between the host computer 3310 and the UE 3330 in response to variations in the measurement results. Measurement procedures and / or network functions for reconfiguring the OTT connection 3350 may be implemented in software 3311 of the host computer 3310 or software 3331 of the UE 3330, or both. In embodiments, sensors (not shown) are located in or in connection with a communication device through which the OTT connection 3350 passes, and the sensors can participate in the measurement procedures by providing values ​​of the monitored quantities exemplified above, or by providing values ​​of other physical quantities that the software 3311, 3331 can calculate or estimate the monitored quantities of. Reconfiguration of the OTT connection 3350 may include message format, retransmission settings, preferred routing, etc., and the reconfiguration may not affect the base station 3320 and may be unknown or imperceptible to the base station 3320. Such procedures and functions may be known and practiced in the art. In certain embodiments, the measurements may include proprietary UE signaling to facilitate host computer measurements such as throughput, propagation time, and latency. The measurements can be implemented so that software 3311, 3331 sends messages, particularly empty or "dummy" messages, while monitoring propagation time, errors, etc., using an OTT connection 3350.

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

[0246] Figure 24 is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station such as APSTA, and a UE such as a non-APSTA, which may be described with reference to Figures 21 and 22. For the sake of simplicity, only a reference drawing to Figure 24 is included in this section. In a first action 3510 of this method, the host computer provides user data. In an optional sub-action (not shown), the host computer provides user data by executing a host application. In a second action 3520, the host computer initiates a transmission that carries the user data to the UE. The transmission may pass through a base station as taught in the embodiments described throughout this disclosure. In an optional third action 3530, the UE receives the user data carried in the transmission.

[0247] Figure 25 is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station such as AP STA, and a UE such as a non-AP STA, which may be described with reference to Figures 21 and 22. For the sake of simplicity of this disclosure, only a reference drawing to Figure 25 is included in this section. In an optional first action 3610 of this method, the UE receives input data provided by the host computer. In addition 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 provides user data by running a client application. In a further optional sub-action 3611 of the first action 3610, the UE runs a client application that provides user data in response to received input data provided by the host computer. When providing user data, the run client application may further consider user input received from the user. Regardless of the particular method by which the user data is provided, in an optional third sub-action 3630, the UE initiates transmission of the user data to the host computer. In the fourth action 3640 of the method, the host computer receives user data transmitted from the UE in accordance with the teachings of the embodiments described through this disclosure.

[0248] Figure 26 is a flowchart 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 described with reference to Figures 21 and 22. For the sake of simplicity, only a reference drawing to Figure 26 is included in this section. In an optional first action 3710 of the method, the base station receives user data from the UE, in accordance with 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 device (UE) (120) or a source master node (MN) (111) to indicate a secondary cell group (SCG) state during a conditional handover (CHO) in a wireless communication network (100), wherein the UE (120) is composed of the current SCG, and the method is: The process involves obtaining (1201) the CHO configuration of the UE (120) from the source MN (111), wherein the CHO configuration includes the configuration of the target candidate nodes (112, 113), and the target candidate nodes (112, 113) include any one or more of the target candidate MN (112) and the target candidate secondary node (SN) (113). When the CHO execution conditions related to the CHO configuration are met, an indication indicating the SCG state, which is set to either SCG active or SCG inactive, is sent to the target candidate nodes (112, 113) (1204), A method that includes this.

2. The method according to claim 1, A method in which the SCG state is set according to either the current SCG state or / or the target SCG state.

3. A method according to claim 1 or 2, further, This includes obtaining the current SCG state (1202), which is set to either SCG active or SCG inactive. A method wherein the indication to the target candidate nodes (112, 113) indicates the current SCG state, the indication sets the target SCG state to SCG active or SCG inactive, and is initiated by the selected target candidate nodes (112, 113).

4. A method according to claim 1 or 2, - Always inactive, - Always active - A value pre-configured as active or inactive, - The latest SCG state that the UE(120) has when CHO is executed, The target SCG state is obtained (1203), which is one of the following: A method wherein the indication to the target candidate nodes (112, 113) indicates the target SCG state.

5. A computer program (1780) that, when executed on a processor (1760), includes instructions causing the processor (1760) to perform the actions described in any one of claims 1 to 4.

6. A carrier (1790) comprising the computer program (1780) described in claim 5, The carrier (1790) is a carrier that is one of the following: 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 processing secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is composed of the current SCG, and the method is: This includes transmitting (1301) the conditional handover (CHO) configuration of the UE (120) to the UE (120), the CHO configuration comprising the configuration of target candidate nodes (112, 113), the target candidate nodes (112, 113) comprising any one or more of the target candidate master node (MN) (112) and the target candidate secondary node (SN) (113), A method wherein the CHO configuration triggers the UE (120) to send an indication to the target candidate nodes (112, 113) indicating an SCG state set to either SCG active or SCG inactive when the CHO execution conditions associated with the CHO configuration are met.

8. The method according to claim 7, A method in which the SCG state includes one of the current SCG state and / or the target SCG state.

9. The method according to claim 7 or 8, further, This includes transmitting (1302) the current SCG state, which is set to either SCG active or SCG inactive, to the UE (120), A method wherein the indication to the target candidate nodes (112, 113) indicates the current SCG state, the indication sets the target SCG state to SCG active or SCG inactive, and is initiated by the selected target candidate nodes (112, 113).

10. The method according to claim 7 or 8, further, - Always inactive, - Always active, - A value pre-configured as active or inactive, - The latest SCG state that the UE(120) has when CHO is executed, This includes configuring the UE (120) in a target SCG state set to any one of the following (1303): The indication is a method for indicating the target SCG state.

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

12. A carrier (1890) comprising the computer program (1880) described in claim 11, The carrier (1890) is a carrier that is one of the following: 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. A method performed by a second network node (112) acting as a target master node (MN) (112) for processing secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is composed of the current SCG, and the method is: A method comprising receiving (1401) an indication from the UE (120) indicating an SCG state which is set to either SCG active or SCG inactive when a CHO execution condition related to the CHO configuration is met.

14. The method according to claim 13, A method in which the SCG state includes one of the current SCG state and / or the target SCG state.

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

16. The method according to claim 13 or 14, further, If the indication indicates a target SCG state including inactivity, the SCG will be activated in response to the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution. If the indication shows a target SCG state including Active, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. If the indication shows a target SCG state including a value pre-configured as active or inactive, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. A method that includes any one of the following.

17. A computer program (1980) that, when executed on a processor (1960), includes instructions causing the processor (1960) to perform the actions described in any one of claims 13 to 16.

18. A carrier (1990) comprising the computer program (1980) described in claim 17, The carrier (1990) is a carrier that is one of the following: 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) to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is composed of the current SCG, and the method is: A method comprising receiving (1504) an indication from the UE (120) indicating an SCG state which is set to either SCG active or SCG inactive when the CHO execution conditions related to the CHO configuration are met.

20. The method according to claim 19, A method in which the SCG state includes one of the current SCG state and / or the target SCG state.

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

22. The method according to claim 19 or 20, further, If the indication indicates a target SCG state including inactivity, the SCG will be activated in response to the SCG after the CHO execution, depending on the traffic evaluation after the CHO execution. If the indication shows a target SCG state including Active, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. If the indication shows a target SCG state including a value pre-configured as active or inactive, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. A method that includes any one of the following.

23. A computer program (2080) that, when executed on a processor (2060), includes instructions causing the processor (2060) to perform the actions described in any one of claims 19 to 22.

24. A carrier (2090) comprising the computer program (2080) described in claim 23, The carrier (2090) is a carrier that is one of the following: 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 device (UE) (120) or source master node (MN) (111) configured to indicate a secondary cell group (SCG) state during a conditional handover (CHO) in a wireless communication network (100), wherein the UE (120) or source MN (111) is configured using the current SCG, and the UE (120) or source MN (111) further, The method involves obtaining the CHO configuration of the UE (120) from the source MN (111), wherein the CHO configuration is adapted to include the configuration of the target candidate nodes (112, 113), and the target candidate nodes (112, 113) are configured to include any one or more of the target candidate MN (112) and the target candidate secondary node (SN) (113). When the CHO execution conditions related to the CHO configuration are met, an indication is sent to the target candidate nodes (112, 113) that is adapted to indicate an SCG state set to either SCG active or SCG inactive. A UE or source MN configured to perform this action.

26. A UE (120) or source (MN) according to claim 26, The SCG state is configured to be set according to either the current SCG state or the target SCG state, in the UE or source MN.

27. A UE (120) or source (MN) according to claim 25 or 26, further, It is configured to acquire the current SCG state, which is adapted to be set to one of SCG active or SCG inactive. The indication to the target candidate nodes (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 nodes (112, 113) as a UE or source MN.

28. A UE (120) or source (MN) according to any one of claims 25 to 27, further, - Always inactive, - Always active, - A value pre-configured as active or inactive, - The latest SCG state that the UE(120) has when CHO is executed, It is configured to acquire a target SCG state that matches one of the following: The indication to the target candidate nodes (112, 113) is adapted to indicate the target SCG state, and is either a UE or a source MN.

29. A first network node (111) operating as a source master node (MN) (111) configured to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is configured to consist of the current SCG, and the first network node (111) The system is configured to transmit a conditional handover (CHO) configuration of the UE (120) to the UE (120), the CHO configuration being adapted to include the configuration of target candidate nodes (112, 113), the target candidate nodes (112, 113) being configured to include any one or more of the target candidate master node (MN) (112) and the target candidate secondary node (SN) (113), A first network node, wherein the CHO configuration is configured to trigger the UE (120) to send an indication to the target candidate nodes (112, 113) that is configured to indicate an SCG state set to either SCG active or SCG inactive, when the CHO execution conditions associated with the CHO configuration are met.

30. The first network node (111) according to claim 29, A first network node whose SCG state is adapted to include either the current SCG state or / or the target SCG state.

31. A first network node (111) according to any one of claims 29 to 30, further, The system is configured to transmit to the UE(120) the current SCG state, which is configured to be set to one of SCG active or SCG inactive. The indication to the target candidate nodes (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 nodes (112, 113), a first network node.

32. A first network node (111) according to any one of claims 29 to 31, further, - Always inactive, - Always active, - A value pre-configured as active or inactive, - The latest SCG state that the UE(120) has when CHO is executed, The UE (120) is configured (1303) to be in a target SCG state adapted to be one of the following: The indication is a first network node that indicates the target SCG state.

33. A second network node (112) operating as a target master node (MN) (112) configured to process secondary cell group (SCG) status during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is adapted to consist of the current SCG, and the second network node (112) further, A second network node is configured to receive an indication from the UE(120) that is adapted to show an SCG state set to either SCG active or SCG inactive when the CHO execution conditions related to the CHO configuration are met.

34. The second network node (112) according to claim 33, A second network node whose SCG state is adapted to include either the current SCG state or / or the target SCG state.

35. A second network node (112) according to claim 33 or 34, further, A second network node configured to set the target SCG state to SCG active or SCG inactive based on the indication, provided that the indication is adapted to show the current SCG state.

36. A second network node (112) according to any one of claims 33 to 35, further comprising: If the indication is adapted to show a target SCG state including inactive, then, in response to the traffic evaluation after the CHO execution, the SCG will be activated after the CHO execution. If the indication is adapted to show a target SCG state including active, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. If the indication is adapted to show a target SCG state including a value pre-configured as active or inactive, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. A second network node configured to perform one of the following actions.

37. A third network node (113) operating as a target secondary node (SN) (113) configured to process secondary cell group (SCG) states during a conditional handover (CHO) to a user device (UE) (120) of a wireless communication network (100), wherein the UE (120) is adapted to consist of the current SCG, and the third network node (113) further, A third network node is configured to receive an indication from the UE(120) that is adapted to show an SCG state set to either SCG active or SCG inactive when the CHO execution conditions related to the CHO configuration are met.

38. A third network node (113) according to claim 37, A third network node whose SCG state is adapted to include either the current SCG state or / or the target SCG state.

39. A third network node (113) according to claim 37 or 38, further, A third network node configured to set the target SCG state to SCG active or SCG inactive based on the indication, provided that the indication is adapted to show the current SCG state.

40. A third network node (113) according to any one of claims 37 to 39, further, If the indication is adapted to show a target SCG state including inactive, then, in response to the traffic evaluation after the CHO execution, the SCG will be activated after the CHO execution. If the indication is adapted to show a target SCG state including active, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. If the indication is adapted to show a target SCG state including a value pre-configured as active or inactive, then, in response to the traffic evaluation after the CHO execution, the SCG may be deactivated after the CHO execution. A third network node configured to perform one of the following actions.

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