A method and apparatus in a communication node used for wireless communication

Abstract

A method and apparatus in a communication node used for wireless communication are disclosed. The communication node receives first signaling indicating a configuration of a first cell; performs a first handover from a source cell to the first cell; determines that the first handover fails; performs a first operation in response to the act of determining that the first handover fails; the act of performing a first handover from a source cell to the first cell includes applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set includes at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured to conditionally reconfigure a candidate cell; when the first node is not configured to conditionally reconfigure a candidate cell, the first operation is to return to the source cell.

Description

TECHNICAL FIELD

[0001] The present application relates to a transmission method and device in a wireless communication system, in particular to a transmission method and device for mobility. BACKGROUND

[0002] To enhance mobility, 3GPP (3rd Generation Partnership Project) Release 16 introduces conditional reconfiguration including CHO (Conditional Handover) for PCell (Primary Cell) and CPC (Conditional PSCell Change) for PSCell (Primary SCG (Secondary Cell Group) Cell), and DAPS (Dual Active Protocol Stack) handover which supports simultaneous use of radio resources of source cell and target cell during handover. The current protocol does not support simultaneous configuration of CHO and DAPS. SUMMARY

[0003] On the one hand, according to the existing protocol, when the UE (User Equipment) occurs RLF (Radio Link Failure) or HOF (Handover Failure), cell selection is performed, if a CHO candidate cell is selected, the configuration of the CHO candidate cell is applied, thereby avoiding RRC (Radio Resource Control) connection re-establishment. However, if the UE selects the source cell, since the RRC configuration of the source cell is released, the RRC connection re-establishment process needs to be performed, therefore, how to avoid RRC connection re-establishment and shorten the transmission delay needs to be further enhanced. On the other hand, when DAPS and CHO are independently configured, when the UE occurs handover failure, if DAPS is configured and the source cell does not occur RLF, the UE restores the source cell; when the UE occurs handover failure, if a CHO candidate cell is configured, the UE performs cell selection, if a CHO candidate cell is selected, the configuration of the CHO candidate cell is applied; if DAPS and CHO are simultaneously configured, when the UE occurs handover failure, the UE behavior after handover failure needs to be optimized and designed.

[0004] To solve the above problems, the present application provides a solution. In the description of the above problems, the switching scenario is taken as an example; the present application is also applicable to scenarios such as Sidelink (SL) transmission and IAB (Integrated Access and Backhaul) transmission, and achieves similar technical effects as in the switching scenario. In addition, using a unified solution for different scenarios also helps to reduce hardware complexity and cost.

[0005] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement TS36 series of 3GPP.

[0006] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement TS38 series of 3GPP.

[0007] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement TS37 series of 3GPP.

[0008] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement of IEEE (Institute of Electrical and Electronics Engineers).

[0009] It should be noted that the embodiments in any node of the present application and the features in the embodiments can be applied to any other node without conflict. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

[0010] The present application discloses a method used in a first node for wireless communication, characterized in that it comprises:

[0011] receiving first signaling indicating a configuration of a first cell; performing a first handover from a source cell to the first cell; determining that the first handover fails;

[0012] in response to the behavior determining that the first handover fails, performing a first operation;

[0013] The behavior of performing a first handover from a source cell to the first cell includes applying the configuration of the first cell; the first operation is a candidate operation in a first candidate operation set, and the first candidate operation set includes at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured to conditionally reconfigure a candidate cell.

[0014] As one embodiment, the first operation is to return to the source cell when the first node is not configured with a conditional reconfiguration candidate cell.

[0015] As one embodiment, the first operation is to return to the source cell when the first node is configured with a conditional reconfiguration candidate cell.

[0016] Typically, the first operation is to return to the source cell when the first node is not configured with a conditional reconfiguration candidate cell.

[0017] As one embodiment, the problem to be solved by the present application includes how to shorten the transmission delay.

[0018] As one embodiment, the problem to be solved by the present application includes how to improve the mobility performance.

[0019] As one embodiment, the problem to be solved by the present application includes how to avoid RRC connection re-establishment.

[0020] As one embodiment, the problem to be solved by the present application includes how to ensure that the mobility is optimized by using DAPS and CHO at the same time.

[0021] As one embodiment, the features of the above method include that the performing the second handover is to quickly recover from the first handover failure by the at least one conditional reconfiguration candidate cell.

[0022] As one embodiment, the features of the above method include that the target cell of the second handover is one of the at least one conditional reconfiguration candidate cell.

[0023] As one embodiment, the features of the above method include that the performing the second handover includes applying the RRC configuration of one of the at least one conditional reconfiguration candidate cell.

[0024] As one embodiment, the features of the above method include that the RRC reconfiguration information of each of the at least one conditional reconfiguration candidate cell is stored in a variable of the first node.

[0025] As one embodiment, the variable includes VarConditionalReconfig.

[0026] As one embodiment, the variable includes VarConditionalReconfiguration.

[0027] As one embodiment, the features of the above method include that the RRC reconfiguration information of the source cell is stored in a variable of the first node.

[0028] As one embodiment, the method includes the feature that the first handover is a CHO handover.

[0029] As one embodiment, the method includes the feature that the first handover is a network-controlled handover.

[0030] As one embodiment, the method includes the feature that the second handover is a CHO handover.

[0031] As one embodiment, the method includes the feature that the handover is implemented through an RRC reconfiguration procedure.

[0032] As one embodiment, the method includes the feature that the handover is implemented through an RRC reestablishment procedure.

[0033] As one embodiment, the method includes the feature that if the source cell is a PCell, the handover refers to changing the PCell.

[0034] As one embodiment, the method includes the feature that if the source cell is a PSCell, the handover refers to changing the PSCell.

[0035] As one embodiment, the method includes the feature that the first set of candidate operations further includes performing an RRC connection reestablishment.

[0036] As one embodiment, the method includes the feature that the first set of candidate operations further includes returning to an RRC idle (RRC_IDLE) state.

[0037] As one embodiment, the method includes the feature that the returning to the source cell includes reverting to the source cell.

[0038] As one embodiment, the method includes the feature that the returning to the source cell includes reverting to an RRC configuration of the source cell.

[0039] As one embodiment, the method includes the feature that the returning to the source cell includes resuming (user) data radio bearer (DRB) transmission.

[0040] As one embodiment, the method includes the feature that the returning to the source cell includes resuming signalling radio bearer (SRB) transmission.

[0041] As one embodiment, the method includes the benefit of avoiding an RRC connection reestablishment.

[0042] As one embodiment, the method includes the benefit of selecting a more optimal cell.

[0043] As one embodiment, benefits of the above method include improved mobility performance.

[0044] As one embodiment, benefits of the above method include improved robustness.

[0045] As one embodiment, benefits of the above method include a tradeoff between latency and robustness.

[0046] According to one aspect of the application, the first node is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled; when there is no cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled, the first operation is to return to the source cell.

[0047] As one embodiment, the above method includes, in response to the behavior determining a first handover failure, returning to the source cell if the first node is configured with at least one conditional reconfiguration candidate cell and there is no cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled.

[0048] As one embodiment, the above method includes, in response to the behavior determining a first handover failure, performing the second handover if the first node is configured with at least one conditional reconfiguration candidate cell and there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled.

[0049] According to one aspect of the application, the first node is configured with at least one conditional reconfiguration candidate cell; there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled; the first operation is related to whether there is at least one target cell in the at least one cell for which an execution condition is fulfilled that has not been used for the first node to perform handover within a first time window; when there is no target cell in the at least one cell for which an execution condition is fulfilled that has not been used for the first node to perform handover within a first time window, the first operation is to return to the source cell; when there is at least one target cell in the at least one cell for which an execution condition is fulfilled that has not been used for the first node to perform handover within a first time window, the first operation is to perform the second handover.

[0050] As one embodiment, the method further comprises, in response to determining that the first handover failed, if the first node is configured with at least one conditional reconfiguration candidate cell and there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled execution condition during the first handover, and the at least one cell that has the fulfilled execution condition includes a target cell that is not used for the first node to hand over within a first time window, performing the second handover.

[0051] As one embodiment, the method further comprises, in response to determining that the first handover failed, if the first node is configured with at least one conditional reconfiguration candidate cell and there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled execution condition during the first handover, and the at least one cell that has the fulfilled execution condition does not include a target cell that is not used for the first node to hand over within a first time window, returning to the source cell.

[0052] According to one aspect of the present application, the first node is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled cell selection condition during running of a first timer; when there is no cell in the at least one conditional reconfiguration candidate cell that has the fulfilled cell selection condition during running of the first timer, the first operation is to return to the source cell; expiration of the first timer is used to determine that there is no cell that has the fulfilled cell selection condition.

[0053] As one embodiment, the method further comprises, in response to determining that the first handover failed, if the first node is configured with at least one conditional reconfiguration candidate cell and there is no cell that has a fulfilled cell selection condition during running of the first timer, returning to the source cell.

[0054] As one embodiment, the method further comprises, in response to determining that the first handover failed, if the first node is configured with at least one conditional reconfiguration candidate cell and there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled execution condition during the first handover, and the at least one cell that has the fulfilled execution condition includes a target cell that is not used for the first node to hand over within a first time window, performing the second handover.

[0055] According to an aspect of the present application, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell that satisfies a cell selection condition during running of a first timer, the first operation is related to whether at least one target cell in the at least one cell that satisfies the cell selection condition is not used for the receiver to perform handover within a first time window; when the at least one target cell in the at least one cell that satisfies the cell selection condition is not included, the first operation is to return to the source cell; when the at least one target cell in the at least one cell that satisfies the cell selection condition is included, the first operation is to perform the second handover.

[0056] According to an aspect of the present application, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is increased by 1.

[0057] According to an aspect of the present application, a first bearer is configured, the first bearer is a DAPS bearer for the first cell.

[0058] According to an aspect of the present application, no radio link failure occurs in the source cell during the first handover.

[0059] According to an aspect of the present application, it comprises:

[0060] A second timer is started along with applying the configuration of the first cell;

[0061] Wherein, expiration of the second timer is used to determine that the first handover fails.

[0062] According to an aspect of the present application, it comprises:

[0063] A second handover is determined to fail; as a response to the behavior of determining that the second handover fails, the source cell is returned.

[0064] According to an aspect of the present application, it comprises:

[0065] Second signaling is received, the second signaling indicates the configuration of each cell in the at least one conditional reconfiguration candidate cell;

[0066] sending third signaling, the third signaling being triggered by the second signaling.

[0067] A method in a second node used for wireless communication is disclosed, comprising:

[0068] sending first signaling, the first signaling indicating a configuration of a first cell;

[0069] wherein a first handover from a source cell to the first cell is performed; a first handover failure is determined; a first operation is performed in response to the first handover failure being determined; the performing of the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprising at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured to at least one condition reconfiguration candidate cell; when the first node is not configured to the condition reconfiguration candidate cell, the first operation is returning to the source cell.

[0070] According to an aspect of the present application, the receiver of the first signaling is configured to at least one condition reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one condition reconfiguration candidate cell that satisfies an execution condition during the first handover; when there is no cell in the at least one condition reconfiguration candidate cell that satisfies the execution condition during the first handover, the first operation is returning to the source cell.

[0071] According to an aspect of the present application, the receiver of the first signaling is configured to at least one condition reconfiguration candidate cell, there is at least one cell in the at least one condition reconfiguration candidate cell that satisfies an execution condition during the first handover, the first operation is related to whether the at least one cell that satisfies the execution condition comprises at least one target cell that is not used for the receiver to perform handover within a first time window; when the at least one cell that satisfies the execution condition does not comprise the target cell that is not used for the receiver to perform handover within the first time window, the first operation is returning to the source cell; when the at least one cell that satisfies the execution condition comprises the target cell that is not used for the receiver to perform handover within the first time window, the first operation is performing the second handover.

[0072] According to an aspect of the present application, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that has a cell selection condition fulfilled during running of a first timer; when there is no cell in the at least one conditional reconfiguration candidate cell that has a cell selection condition fulfilled during running of the first timer, the first operation is to return to the source cell; expiration of the first timer is used to determine that there is no cell that has a cell selection condition fulfilled.

[0073] According to an aspect of the present application, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell that has a cell selection condition fulfilled during running of a first timer, the first operation is related to whether the at least one cell that has a cell selection condition fulfilled includes at least one target cell that has not been used for the receiver to perform handover within a first time window; when the at least one cell that has a cell selection condition fulfilled does not include at least one target cell that has not been used for the receiver to perform handover within a first time window, the first operation is to return to the source cell; when the at least one cell that has a cell selection condition fulfilled includes at least one target cell that has not been used for the receiver to perform handover within a first time window, the first operation is to perform the second handover.

[0074] According to an aspect of the present application, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is increased by 1.

[0075] According to an aspect of the present application, a first bearer is configured, the first bearer is a DAPS bearer for the first cell.

[0076] According to an aspect of the present application, no radio link failure occurs in the source cell during the first handover.

[0077] According to an aspect of the present application, a second timer is started in response to the configuration accompanying the first cell being applied; expiration of the second timer is used to determine that the first handover fails.

[0078] According to an aspect of the present application, returning to the source cell is performed in response to the behavior determining that the second handover fails.

[0079] According to one aspect of the present application, it features comprising:

[0080] sending second signaling, the second signaling indicating a configuration of each of the at least one conditional reconfiguration candidate cell;

[0081] receiving third signaling, the third signaling triggered by the second signaling.

[0082] The present application discloses a first node for wireless communication, characterized by comprising:

[0083] a first receiver, receiving first signaling, the first signaling indicating a configuration of a first cell; performing a first handover from a source cell to the first cell; determining a first handover failure;

[0084] a first transceiver, performing a first operation in response to the behavior determining the first handover failure;

[0085] wherein the behavior performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprising at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell; when the first node is not configured a conditional reconfiguration candidate cell, the first operation is returning to the source cell.

[0086] The present application discloses a second node for wireless communication, characterized by comprising:

[0087] a second transmitter, sending first signaling, the first signaling indicating a configuration of a first cell;

[0088] wherein a first handover from a source cell to the first cell is performed; a first handover failure is determined; a first operation is performed in response to the first handover failure being determined; the behavior performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprising at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell; when the first node is not configured a conditional reconfiguration candidate cell, the first operation is returning to the source cell.

[0089] As one embodiment, compared with the conventional scheme, the present application has the following advantages:

[0090] -. Avoid RRC connection re-establishment;

[0091] - selecting a better cell;

[0092] - improving mobility performance;

[0093] - improving robustness;

[0094] - a compromise between latency and robustness. BRIEF DESCRIPTION OF DRAWINGS

[0095] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in connection with the following accompanying drawings:

[0096] Figure 1 a flowchart illustrating transmission of first signaling according to one embodiment of the application is shown;

[0097] Figure 2 a schematic diagram illustrating a network architecture according to one embodiment of the application is shown;

[0098] Figure 3 a schematic diagram illustrating an embodiment of a radio protocol architecture for the user and control planes according to one embodiment of the application is shown;

[0099] Figure 4 a schematic diagram illustrating a first communication device and a second communication device according to one embodiment of the application is shown;

[0100] Figure 5 a flowchart illustrating wireless signal transmission according to one embodiment of the application is shown;

[0101] Figure 6 a schematic diagram illustrating a first operation related to whether at least one cell for which at least one execution condition is fulfilled exists in at least one conditionally reconfigured candidate cell during a first handover according to one embodiment of the application is shown;

[0102] Figure 7 a schematic diagram illustrating a first operation related to whether at least one target cell for which at least one execution condition is fulfilled is included in at least one cell that has not been used for handover by the first node within a first time window according to one embodiment of the application is shown;

[0103] Figure 8 a schematic diagram illustrating a first operation related to whether at least one cell selection condition is fulfilled for at least one cell in at least one conditionally reconfigured candidate cell during running of a first timer according to one embodiment of the application is shown;

[0104] Figure 9Fig. 1 shows a flowchart of the first signaling transmission according to an embodiment of the present application, as shown in Fig. 1. In Fig. 1, each block represents a step, and it is particularly emphasized that the order of the blocks in the figure does not represent the time sequence between the steps represented.

[0105] Figure 10 Fig. 2 shows a flowchart of the first operation according to an embodiment of the present application, which is related to whether the target cell of the handover includes at least one cell in which the first signaling is not used for reception in the first time window, and at least one cell selection condition is met.

[0106] Figure 11 Fig. 3 shows a structural block diagram of a processing device in the first node according to an embodiment of the present application.

[0107] Figure 12 Fig. 4 shows a structural block diagram of a processing device in the second node according to an embodiment of the present application.

[0108] Figure 13 Fig. 5 shows a flowchart of the second handover failure according to an embodiment of the present application, which is used to determine the return to the source cell. DETAILED DESCRIPTION

[0109] The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings, and it should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0110] Example 1

[0111] Embodiment 1 illustrates a flowchart of the first signaling transmission according to an embodiment of the present application, as shown in Fig. 1. In Fig. 1, each block represents a step, and it is particularly emphasized that the order of the blocks in the figure does not represent the time sequence between the steps represented. Figure 1 Figure 1

[0112] In embodiment 1, the first node in the present application receives the first signaling in step 101, the first signaling indicates the configuration of the first cell; performs the first handover from the source cell to the first cell; determines the first handover failure; in step 102, as a response to the behavior of determining the first handover failure, performs the first operation; wherein the behavior of performing the first handover from the source cell to the first cell includes applying the configuration of the first cell; the first operation is one candidate operation in the first candidate operation set, the first candidate operation set includes at least two candidate operations of returning to the source cell and performing the second handover; the first operation is related to whether the first node is configured at least one condition to reconfigure the candidate cell; when the first node is not configured to reconfigure the candidate cell, the first operation is to return to the source cell. ​​

[0113] As one embodiment, the handover includes a PCell handover.

[0114] As one embodiment, the handover includes a synchronization reconfiguration.

[0115] As one embodiment, the handover includes a PSCell change.

[0116] As one embodiment, the source cell is a source PCell.

[0117] As one embodiment, the source cell is a PCell.

[0118] As one embodiment, the source cell is a PSCell.

[0119] As one embodiment, a cell group to which the source cell belongs is a source SCG (Secondary Cell Group).

[0120] As one embodiment, a cell group to which the source cell belongs is a source MCG (Master Cell Group).

[0121] As one embodiment, the first cell is a target cell.

[0122] As one embodiment, the first cell is a target PCell.

[0123] As one embodiment, the first cell is a target PSCell.

[0124] As one embodiment, a cell group to which the first cell belongs is a target SCG.

[0125] As one embodiment, a cell group to which the first cell belongs is a target MCG.

[0126] As one embodiment, the first cell is a conditional reconfiguration candidate cell.

[0127] As one embodiment, the first cell is a CPC candidate cell.

[0128] As one embodiment, the first cell is a CHO candidate cell.

[0129] As one embodiment, the first cell is one of the at least one conditional reconfiguration candidate cell.

[0130] As one embodiment, the first cell is one of the at least one conditional reconfiguration candidate cell for which a condition is satisfied.

[0131] As one embodiment, the first cell is a triggered cell.

[0132] As one embodiment, the first cell is a selected cell.

[0133] As one embodiment, the first signaling is a DownLink (DL) message.

[0134] As one embodiment, the first signaling is a SideLink (SL) message.

[0135] As one embodiment, the first signaling is transmitted over SRB1.

[0136] As one embodiment, the first signaling is transmitted over SRB3.

[0137] As one embodiment, the first signaling is transmitted on a DCCH (Dedicated Control Channel).

[0138] As one embodiment, the first signaling is an RRC layer message.

[0139] As one embodiment, the first signaling is used for handover configuration.

[0140] As one embodiment, the first signaling is used for configuration for conditional reconfiguration.

[0141] As one embodiment, the first signaling is used for configuration for CHO.

[0142] As one embodiment, the first signaling is used for configuration for CPC.

[0143] As one embodiment, the first signaling is used for configuration for network-based handover.

[0144] As one embodiment, the first signaling is used for configuration for conditional reconfiguration based handover.

[0145] As one embodiment, the first signaling includes at least one RRC message.

[0146] As one embodiment, the first signaling includes an RRCReconfiguration message.

[0147] As one embodiment, the first signaling includes an RRCConnectionReconfiguration message.

[0148] As an embodiment, the first signaling includes one RRC IE (Information element) whose name includes CellGroupConfig.

[0149] As an embodiment, the first signaling includes one RRC IE whose name includes ServingCellConfigCommon.

[0150] As an embodiment, the first signaling includes one RRC IE whose name includes RACH-ConfigDedicated.

[0151] As an embodiment, the first signaling includes one RRC IE whose name includes RACH-ConfigDedicated.

[0152] As an embodiment, the first signaling includes one RRC field whose name includes ReconfigurationWithSync.

[0153] As an embodiment, the first signaling includes one RRC IE whose name includes mobilityControlInfo.

[0154] As an embodiment, the first signaling includes one RRC field whose name includes MobilityControlInfoSCG.

[0155] As an embodiment, the first signaling includes one RRC field whose name includes SpCellConfig.

[0156] As an embodiment, the first signaling includes one RRC field whose name includes masterCellGroup.

[0157] As an embodiment, the first signaling includes one RRC field whose name includes secondaryCellGroup.

[0158] As an embodiment, the first signaling includes one RRC IE whose name includes ConditionalReconfiguration.

[0159] As one embodiment, the first signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigToAddModList.

[0160] As one embodiment, the first signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigurationToAddModList.

[0161] As one embodiment, the first signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigId.

[0162] As one embodiment, the first signaling includes an RRC IE, and the name of the RRC IE includes ConditionalReconfigurationId.

[0163] As one embodiment, the first signaling includes an RRC field, and the name of the RRC field includes triggerCondition.

[0164] As one embodiment, the first signaling includes an RRC field, and the name of the RRC field includes condExecutionCond.

[0165] As one embodiment, the first signaling includes an RRC field, and the name of the RRC field includes condRRCReconfig.

[0166] As one embodiment, the first signaling includes an RRC field, and the name of the RRC field includes condReconfigurationToApply.

[0167] As one embodiment, the first signaling does not include an RRC IE whose name includes ConditionalReconfiguration.

[0168] As one embodiment, the first signaling does not include an RRC IE whose name includes CondReconfigToAddModList or CondReconfigurationToAddModList.

[0169] As one embodiment, the first signaling does not include an RRC IE whose name includes CondReconfigId or ConditionalReconfigurationId.

[0170] As one embodiment, the first signaling does not include an RRC field whose name includes condExecutionCond or triggerCondition.

[0171] As one embodiment, the first signaling does not include an RRC field whose name includes condRRCReconfig or condReconfigurationToApply.

[0172] As one embodiment, the phrase the first signaling indicates configuration of the first cell includes that the first signaling includes configuration information of the first cell.

[0173] As one embodiment, the phrase the first signaling indicates configuration of the first cell includes that the first signaling is used to configure for the first cell.

[0174] As one embodiment, the phrase the first signaling indicates configuration of the first cell includes that the first signaling includes parameters for the synchronous reconfiguration to the first cell.

[0175] As one embodiment, the phrase the first signaling indicates configuration of the first cell includes that the first signaling includes cell specific parameters of the first cell.

[0176] As one embodiment, the first signaling includes a cell identity of the first cell.

[0177] As one embodiment, the first signaling includes an identity of the first node in the first cell.

[0178] As one embodiment, the behavior applying the configuration of the first cell includes at least one of the following behaviors:

[0179] - start synchronization to downlink of the first cell;

[0180] - apply BCCH (Broadcast Channel) configuration of the first cell;

[0181] - acquire MIB (Master Information Block) of the first cell, scheduling reference 3GPP TS 38.213;

[0182] - applying a value of newUE-Identity in the first signaling as C-RNTI (Cell Radio Network Temporary Identifier) of the first node in a cell group to which the first cell belongs;

[0183] - configuring lower layers of the first cell according to spCellConfigCommon in the first signaling;

[0184] - configuring lower layers of the first cell according to other fields in the first signaling;

[0185] - applying the configuration of the first cell;

[0186] - performing a random access procedure on the first cell.

[0187] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises sending Msg1 (Message 1) on the first cell, the Msg1 comprising at least a random access preamble.

[0188] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises receiving Msg2 (Message 2) on the first cell, the Msg2 comprising at least a RAR (Random Access Response).

[0189] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises sending Msg3 (Message 3) on the first cell, the Msg3 comprising at least a C-RNTI MAC (Medium Access Control) CE (Control Element).

[0190] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises receiving Msg4 (Message 4) on the first cell, the Msg4 comprising at least a UE ContentionResolution Identity MAC CE.

[0191] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises sending MsgA (Message A) on the first cell, the MsgA comprising at least a random access preamble and a C-RNTI MAC CE.

[0192] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises receiving a MsgB (Message B) on the first cell, the MsgB comprising a PDCCH (Physical Downlink Control Channel).

[0193] As one sub-embodiment of this embodiment, the MsgB is a fallbackRAR.

[0194] As one sub-embodiment of this embodiment, the MsgB is a successRAR.

[0195] As one embodiment, the behavior performing the first handover from the source cell to the first cell comprises sending an RRC connection reestablishment complete message on the first cell.

[0196] As one embodiment, the RRC connection reestablishment complete message comprises an RRCReconfigurationComplete message.

[0197] As one embodiment, the RRC connection reestablishment complete message comprises an RRCConnectionReconfigurationComplete message.

[0198] As one embodiment, the behavior determining the first handover failure comprises determining a Reconfiguration with sync Failure.

[0199] As one embodiment, the behavior determining the first handover failure comprises detecting that the first handover failed.

[0200] As one embodiment, the behavior determining the first handover failure comprises considering that the first handover failed.

[0201] As one embodiment, a random access procedure performed on the first cell during the first handover fails to be used to determine the first handover failed.

[0202] As one embodiment, a random access problem indication received from a MAC layer during the first handover is used to determine the first handover failed.

[0203] As one embodiment, a second timer is started with the configuration of the first cell applied; expiry of the second timer is used to determine the first handover failed.

[0204] As one embodiment, the second timer is a T304.

[0205] As one embodiment, the second timer is T307.

[0206] As one embodiment, the second timer expires means that the second timer reaches an expiration value of the second timer.

[0207] As one embodiment, the second timer expires means that a running time of the second timer reaches an expiration value of the second timer.

[0208] As one embodiment, the second timer expires means that a counting of the second timer reaches an expiration value of the second timer.

[0209] As one embodiment, the second timer expires means that a time interval between a time when the second timer is started and a time when the second timer expires is not less than an expiration value of the second timer.

[0210] As one embodiment, the expiration value of the second timer is configured by an RRC message.

[0211] As one embodiment, the expiration value of the second timer is configurable.

[0212] As one embodiment, the act of starting the second timer means starting the second timer.

[0213] As one embodiment, the act of starting the second timer means that the second timer starts counting.

[0214] As one embodiment, the act of starting the second timer means that the second timer starts running.

[0215] As one embodiment, an initial value of the second timer is equal to 0.

[0216] As one embodiment, a time interval between a time when the second timer is started and a time when the second timer expires is not restarted.

[0217] As one embodiment, the second timer belongs to a cell group to which the source cell belongs.

[0218] As one embodiment, the source cell is a PCell and the second timer belongs to an MCG.

[0219] As one embodiment, the phrase as the act of determining the first handover failure in response includes when the first handover failure is determined.

[0220] As one embodiment, the phrase as the act of determining the first handover failure in response includes if the first handover failure is detected.

[0221] As one embodiment, the phrase the behavior determines a response to a first handover failure comprises if the second timer expires.

[0222] As one embodiment, the behavior performing a first handover from a source cell to the first cell refers to applying the configuration of the first cell.

[0223] As one embodiment, the behavior performing a first handover from a source cell to the first cell comprises applying at least the configuration of the first cell.

[0224] As one embodiment, the first set of operations further comprises returning to an RRC idle state.

[0225] As one embodiment, the first set of operations further comprises performing an RRC connection re-establishment procedure.

[0226] As one embodiment, the behavior returning to the source cell comprises at least one of the following behaviors:

[0227] - resuming suspended SRBs in the source cell.

[0228] - for each non-DAPS bearer, reverting back to the UE configuration used for the DRB in the source cell, including PDCP, RLC state variables, security configuration and data stored in transmission and reception buffers in PDCP and RLC entities.

[0229] - reverting back to the UE measurement configuration used in the source cell.

[0230] As one embodiment, if the first node is configured at least one conditional reconfiguration candidate cell, and the first operation is to perform the second handover, the target cell of the second handover is the second cell, and the second cell is one of the at least one conditional reconfiguration candidate cell.

[0231] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a condition is fulfilled.

[0232] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a cell selection condition is fulfilled.

[0233] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a trigger is fulfilled.

[0234] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a trigger is fulfilled.

[0235] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a trigger is fulfilled.

[0236] As one sub-embodiment of this embodiment, the second cell is one of the at least one conditional reconfiguration candidate cell in which a trigger is fulfilled.

[0237] As one embodiment, the second cell is the same as the first cell.

[0238] As one embodiment, the second cell is different from the first cell.

[0239] As one embodiment, the behavior of performing the second handover comprises at least one of the following behaviors:

[0240] - start synchronization to the downlink of the second cell;

[0241] - apply the BCCH (Broadcast Channel) configuration of the second cell;

[0242] - acquire the MIB (Master Information Block) of the second cell, the scheduling reference of the MIB is 3GPP TS 38.213;

[0243] - performing the identity (newUE-Identity) of the first node U01 in the second cell included in the synchronous reconfiguration with the second cell as target cell as C-RNTI of the first node in the cell group the second cell belongs to;

[0244] - configuring lower layers of the second cell according to spCellConfigCommon for the second cell;

[0245] - configuring lower layers of the second cell according to other configurations for the second cell;

[0246] - performing reconfiguration with sync;

[0247] - performing a random access procedure on the second cell;

[0248] - sending an RRC connection re-establishment complete message on the second cell.

[0249] As one embodiment, the phrase the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell comprises whether the first node is configured at least one conditional reconfiguration candidate cell is used to determine the first operation.

[0250] As one embodiment, the phrase the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell comprises whether the first node is configured at least one conditional reconfiguration candidate cell is used to determine whether to perform the second handover.

[0251] As one embodiment, the phrase the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell comprises whether the first node is configured at least one conditional reconfiguration candidate cell is used to determine whether to return to the source cell.

[0252] As one embodiment, the phrase the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell comprises whether the first node is configured at least one conditional reconfiguration candidate cell is used to determine whether to return to the source cell or to perform the second handover.

[0253] As one embodiment, the phrase the first operation is related to at least whether the first node is configured at least one conditional reconfiguration candidate cell comprises the first operation is related to only whether the first node is configured at least one conditional reconfiguration candidate cell.

[0254] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell whose execution condition is satisfied during the first handover.

[0255] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is satisfied during running of a first timer.

[0256] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether there is at least one target cell in the at least one conditional reconfiguration candidate cell which is not used for the first node to perform handover within a first time window.

[0257] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether the first bearer is configured.

[0258] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether radio link failure occurs in the source cell during the first handover.

[0259] As one embodiment, the phrase the first operation is related to whether at least the first node is configured with at least one conditional reconfiguration candidate cell includes that the first operation is related to whether the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether a first counter reaches a first integer.

[0260] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, the source cell does not experience radio link failure; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell.

[0261] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, the source cell does not experience radio link failure; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell; if the first node is configured at least one conditional reconfiguration candidate cell, the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that satisfies at least one execution condition during the first handover.

[0262] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, the source cell does not experience radio link failure; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell; if the first node is configured at least one conditional reconfiguration candidate cell, the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that satisfies at least one execution condition during the first handover; if there is at least one cell in the at least one conditional reconfiguration candidate cell that satisfies at least one execution condition during the first handover, the first operation relates to whether the at least one cell that satisfies the at least one execution condition includes at least one target cell that is not used for the first node to perform handover within a first time window.

[0263] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, the source cell does not experience radio link failure; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell; if the first node is configured at least one conditional reconfiguration candidate cell, the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that satisfies at least one execution condition during the first handover.

[0264] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, no radio link failure occurs in the source cell; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell; if the first node is configured at least one conditional reconfiguration candidate cell, the first operation relates to whether there is at least one cell in which a cell selection condition is satisfied in the at least one conditional reconfiguration candidate cell during running of a first timer; if there is at least one cell in which a cell selection condition is satisfied in the at least one conditional reconfiguration candidate cell during running of the first timer, the first operation relates to whether at least one target cell in which a cell selection condition is satisfied in the at least one conditional reconfiguration candidate cell is included in the at least one target cell which is not used for the first node to perform handover within a first time window.

[0265] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell; during the first handover, no radio link failure occurs in the source cell; the first operation relates to whether the first node is configured at least one conditional reconfiguration candidate cell; if the first node is configured at least one conditional reconfiguration candidate cell, the first operation relates to whether a first counter reaches a first integer.

[0266] As one embodiment, it is determined whether the first node is configured at least one conditional reconfiguration candidate cell according to whether there is at least one entry in VarConditionalReconfig.

[0267] As one embodiment, it is determined whether the first node is configured at least one conditional reconfiguration candidate cell according to whether there is at least one entry in VarConditionalReconfig.

[0268] As one sub-embodiment of this embodiment, if at least one entry is included in VarConditionalReconfig, the first node is configured at least one conditional reconfiguration candidate cell.

[0269] As one sub-embodiment of this embodiment, if at least one entry is included in VarConditionalReconfig, the first node is configured at least one conditional reconfiguration candidate cell.

[0270] As one sub-embodiment of this embodiment, if no entry is included in VarConditionalReconfig, the first node is not configured at least one conditional reconfiguration candidate cell.

[0271] As a sub-example of this example, the first node is not configured with at least one conditional reconfiguration candidate cell if none of the entries in VarConditionalReconfiguration are included.

[0272] As one example, the first operation is to return to the source cell when the first node is not configured with a conditional reconfiguration candidate cell.

[0273] As one example, the first operation is to perform the second handover when the first node is configured with a conditional reconfiguration candidate cell.

[0274] As one example, the first node evaluates execution conditions for the at least one conditional reconfiguration candidate cell during the first handover.

[0275] As one example, the first node does not evaluate execution conditions for the at least one conditional reconfiguration candidate cell during the first handover.

[0276] As one example, the first node decides whether to evaluate execution conditions for the at least one conditional reconfiguration candidate cell during the first handover.

[0277] As one example, the first operation is to return to the source cell when the first node is not configured with a conditional reconfiguration candidate cell; wherein the first bearer is configured and no radio link failure of the source cell occurs during the first handover.

[0278] As one example, the first operation is to return to the source cell when the first node is not configured with a conditional reconfiguration candidate cell; wherein the first bearer is not configured and no radio link failure of the source cell occurs during the first handover.

[0279] As one example, the first operation is to return to the source cell when the first node is configured with a conditional reconfiguration candidate cell; wherein the first bearer is configured and no radio link failure of the source cell occurs during the first handover.

[0280] As one example, the first operation is to return to the source cell when the first node is configured with a conditional reconfiguration candidate cell; wherein the first bearer is not configured and no radio link failure of the source cell occurs during the first handover.

[0281] As one example, the first operation is to perform the second handover when the first node is configured with a conditional reconfiguration candidate cell; wherein the first bearer is not configured.

[0282] As one embodiment, when the first node is configured a conditional reconfiguration candidate cell, the first operation is to perform the second handover; wherein the first bearer is not configured, and radio link failure occurs in the source cell during the first handover.

[0283] As one embodiment, when the first node is configured a conditional reconfiguration candidate cell, the first operation is to perform the second handover; wherein the first bearer is configured, and radio link failure occurs in the source cell during the first handover.

[0284] As one embodiment, if the first operation is to perform the second handover, as a response to the second handover being initiated, all entries in VarConditionalReconfig are removed.

[0285] As one embodiment, if the first operation is to perform the second handover, as a response to the second handover being initiated, the configuration of the at least one conditional reconfiguration candidate cell is released.

[0286] Example 2

[0287] Embodiment 2 illustrates a schematic diagram of a network architecture according to one embodiment of the present application, as shown in FIG. 2. FIG. 2 illustrates a schematic diagram of a network architecture according to one embodiment of the present application. Figure 2 As shown in FIG. 2, the network architecture includes a source cell 200, a target cell 202, a first node 204, and a second node 206. The source cell 200 is configured to communicate with the first node 204 and the second node 206. The target cell 202 is configured to communicate with the first node 204 and the second node 206. The first node 204 is configured to communicate with the source cell 200 and the target cell 202. The second node 206 is configured to communicate with the source cell 200 and the target cell 202. Figure 2A network architecture 200 for a 5G NR (New Radio) / LTE (Long-Term Evolution) / LTE-A (Long-Term Evolution Advanced) system is illustrated. The 5G NR / LTE / LTE-A network architecture 200 can be referred to as a 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 includes a UE (User Equipment) 201, a RAN (Radio Access Network) 202, a 5GC (5G Core Network, 5G Core) / EPC (Evolved Packet Core) 210, a HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and at least one of an Internet service 230. The 5GS / EPS can interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As illustrated, the 5GS / EPS provides packet-switched services, however, one of skill in the art will readily appreciate that the various concepts presented throughout this application can be extended to networks providing circuit-switched services or other cellular networks. The RAN includes a node 203 and other nodes 204. The node 203 provides user and control plane protocol terminations toward the UE 201. The node 203 can be connected to the other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. The node 203 can also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (Transmit Receive Point), or some other suitable terminology. The node 203 provides an access point to the 5GC / EPC 210 for a UE 201. Examples of UEs 201 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a non-tethered base station communication, a satellite mobile communication, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a drone, a flying vehicle, a narrowband internet of things device, a machine type communication device, a land vehicle, a car, a wearable device, or any other similar functional device. Those skilled in the art will also recognize a UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wirelessThe node 203 is connected to a 5GC / EPC 210 via an S1 / NG interface. The 5GC / EPC 210 comprises a MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, a S-GW (Service Gateway) / UPF (User Plane Function) 212, and a P-GW (Packet Date Network Gateway) / UPF 213. The MME / AMF / SMF 211 is a control node that handles signaling between the UE 201 and the 5GC / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocal) packets are transferred through the S-GW / UPF 212, which is itself connected to the P-GW / UPF 213. The P-GW provides UE IP address allocation, among other functions. The P-GW / UPF 213 is connected to Internet services 230. The Internet services 230 comprise operator corresponding Internet protocol services, which can specifically include the Internet, an intranet, IMS (IP Multimedia Subsystem), and packet switched streaming services.

[0288] As one embodiment, the UE 201 corresponds to the first node in the present application.

[0289] As one embodiment, the UE 201 is a user equipment (UE).

[0290] As one embodiment, the node 203 corresponds to the second node in the present application.

[0291] As one embodiment, the node 203 is a base station (BS).

[0292] As one embodiment, the node 203 is a base transceiver station (BTS).

[0293] As one embodiment, the node 203 is a NodeB (NB).

[0294] As one embodiment, the node 203 is a gNB.

[0295] As an embodiment, the node 203 is an eNB.

[0296] As an embodiment, the node 203 is an ng-eNB.

[0297] As an embodiment, the node 203 is an en-gNB.

[0298] As an embodiment, the node 203 is a user equipment.

[0299] As an embodiment, the node 203 is a relay.

[0300] As an embodiment, the node 203 is a gateway.

[0301] As an embodiment, the node 204 corresponds to the third node in the present application.

[0302] As an embodiment, the node 204 corresponds to the fourth node in the present application.

[0303] As an embodiment, the node 204 is a BS.

[0304] As an embodiment, the node 204 is a BTS.

[0305] As an embodiment, the node 204 is an NB.

[0306] As an embodiment, the node 204 is a gNB.

[0307] As an embodiment, the node 204 is an eNB.

[0308] As an embodiment, the node 204 is an ng-eNB.

[0309] As an embodiment, the node 204 is an en-gNB.

[0310] As an embodiment, the node 204 is a user equipment.

[0311] As an embodiment, the node 204 is a relay.

[0312] As an embodiment, the node 204 is a gateway.

[0313] As an embodiment, the user equipment supports transmission of a non-terrestrial network (NTN).

[0314] As one embodiment, the user equipment supports transmissions in a non-terrestrial network.

[0315] As one embodiment, the user equipment supports transmissions in a large latency difference network.

[0316] As one embodiment, the user equipment supports dual connection (DC) transmissions.

[0317] As one embodiment, the user equipment comprises an aerial vehicle.

[0318] As one embodiment, the user equipment comprises a vehicular terminal.

[0319] As one embodiment, the user equipment comprises a ship.

[0320] As one embodiment, the user equipment comprises an Internet of Things terminal.

[0321] As one embodiment, the user equipment comprises an Industrial Internet of Things terminal.

[0322] As one embodiment, the user equipment comprises a device supporting low latency high reliability transmissions.

[0323] As one embodiment, the user equipment comprises a test device.

[0324] As one embodiment, the user equipment comprises a signaling tester.

[0325] As one embodiment, the base station equipment supports transmissions in a non-terrestrial network.

[0326] As one embodiment, the base station equipment supports transmissions in a large latency difference network.

[0327] As one embodiment, the base station equipment supports transmissions in a terrestrial network.

[0328] As one embodiment, the base station equipment comprises a marco cellular base station.

[0329] As one embodiment, the base station equipment comprises a micro cell base station.

[0330] As one embodiment, the base station equipment comprises a pico cell base station.

[0331] As one embodiment, the base station equipment comprises a femtocell.

[0332] As one embodiment, the base station device comprises a base station device supporting large latency differences.

[0333] As one embodiment, the base station device comprises a flying platform device.

[0334] As one embodiment, the base station device comprises a satellite device.

[0335] As one embodiment, the base station device comprises a TRP (Transmitter Receiver Point).

[0336] As one embodiment, the base station device comprises a CU (Centralized Unit).

[0337] As one embodiment, the base station device comprises a DU (Distributed Unit).

[0338] As one embodiment, the base station device comprises a test device.

[0339] As one embodiment, the base station device comprises a signaling tester.

[0340] As one embodiment, the base station device comprises an IAB (Integrated Access and Backhaul)-node.

[0341] As one embodiment, the base station device comprises an IAB-donor.

[0342] As one embodiment, the base station device comprises an IAB-donor-CU.

[0343] As one embodiment, the base station device comprises an IAB-donor-DU.

[0344] As one embodiment, the base station device comprises an IAB-DU.

[0345] As one embodiment, the base station device comprises an IAB-MT.

[0346] As one embodiment, the relay comprises a relay.

[0347] As one embodiment, the relay comprises an L3 relay.

[0348] As one embodiment, the relay comprises an L2 relay.

[0349] As one embodiment, the relay comprises a router.

[0350] As one embodiment, the relay comprises a switch.

[0351] As one embodiment, the relay comprises a user equipment.

[0352] As one embodiment, the relay comprises a base station equipment.

[0353] As one embodiment, if the first bearer in this application is configured, during the first handover, the first node is connected to the second node and the third node simultaneously by DAPS.

[0354] As one embodiment, if the second bearer in this application is configured, during the second handover, the first node is connected to the second node and the fourth node simultaneously by DAPS.

[0355] Example 3

[0356] Embodiment 3 shows a schematic diagram of an embodiment of a radio protocol architecture for a user plane and a control plane according to the present application, as shown in Fig. 3. Figure 3 Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3 ​The radio protocol architecture for the control plane 300 is shown with three layers: Layer 1, Layer 2 and Layer 3. Layer 1 (LI layer) is the lowest layer and implements various PHY (Physical layer) signal processing functions. The LI layer will be referred to as the PHY 301 herein. Layer 2 (L2 layer) 305 is above the PHY 301 and includes a MAC (Medium Access Control) sublayer 302, a RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security functions including ciphering of the data packets and header compression. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and using RRC signaling to configure the lower layers. The radio protocol architecture for the user plane 350 includes Layer 1 (LI layer) and Layer 2 (L2 layer), which are substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead. Also included in the L2 layer 355 in the user plane 350 is the SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping between QoS flows and data radio bearers (DRBs) to support diverse traffic.

[0357] As one embodiment, the radio protocol architecture in the first node 100 in FIG. 1 is applicable to the first node in the present application. Figure 3 As one embodiment, the radio protocol architecture in the second node 200 in FIG. 2 is applicable to the second node in the present application.

[0358] As one embodiment, the radio protocol architecture in the first node 100 in FIG. 1 is applicable to the first node in the present application. Figure 3 As one embodiment, the radio protocol architecture in the second node 200 in FIG. 2 is applicable to the second node in the present application.

[0359] As an embodiment, the wireless protocol architecture in Figure 3 applicable to the third node in the present application.

[0360] As an embodiment, the wireless protocol architecture in Figure 3 applicable to the fourth node in the present application.

[0361] As an embodiment, the first signaling in the present application is generated at the RRC 306.

[0362] As an embodiment, the first signaling in the present application is generated at the MAC 302 or MAC 352.

[0363] As an embodiment, the first signaling in the present application is generated at the PHY 301 or PHY 351.

[0364] As an embodiment, the second signaling in the present application is generated at the RRC 306.

[0365] As an embodiment, the second signaling in the present application is generated at the MAC 302 or MAC 352.

[0366] As an embodiment, the second signaling in the present application is generated at the PHY 301 or PHY 351.

[0367] As an embodiment, the third signaling in the present application is generated at the RRC 306.

[0368] As an embodiment, the third signaling in the present application is generated at the MAC 302 or MAC 352.

[0369] As an embodiment, the third signaling in the present application is generated at the PHY 301 or PHY 351.

[0370] Example 4

[0371] Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to the present application, as shown in Figure 4 Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0372] The first communication device 450 comprises a controller / processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multiple antenna transmit processor 457, a multiple antenna receive processor 458, a transmitter / receiver 454 and an antenna 452.

[0373] ​The second communications device 410 includes a controller / processor 475, a memory 476, a receive processor 470, a transmit processor 416, a multi-antenna receive processor 472, a multi-antenna transmit processor 471, a transmitter / receiver 418, and antennas 420.

[0374] In the transmission from the second communications device 410 to the first communications device 450, upper layer packets from a core network are provided to the controller / processor 475 at the second communications device 410. The controller / processor 475 implements functionality of the L2 layer. In the transmission from the second communications device 410 to the first communications device 450, the controller / processor 475 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation for the first communications device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets, and signaling to the first communications device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the LI layer (i.e., physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communications device 410, and mapping of coded and modulated symbols onto resource elements (REs) for transmission. The multi-antenna transmit processor 471 performs digital spatial precoding of the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes the stream with reference signals (e.g., pilots), and then performs a Fast Fourier Transform (FFT) to generate a time-domain OFDM symbol stream. The multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain OFDM symbol stream. Each transmitter 418 converts the baseband OFDM symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency (RF) signal that is transmitted via a respective antenna 420.

[0375] In transmissions from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its respective antenna 452. Each receiver 454 recovers information modulated onto an RF carrier and provides the recovered information at baseband as a stream of symbols to a receive processor 456. The receive processor 456 and a multiple access receiver processor 458 implement various signal processing functions of the Ll layer. The multiple access receiver processor 458 performs receive analog precoding / beamforming operations on the baseband multiple access symbol streams from the receivers 454. The receive processor 456 converts the baseband multiple access symbol streams from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signals and the reference signals are demultiplexed from the received symbol streams, with the reference signals to be used for channel estimation and the data signals to be recovered after multiple access detection in the multiple access receiver processor 458 for any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered by the receive processor 456 and used to generate soft decisions. The receive processor 456 then decodes and de-interleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to a controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 can be associated with a memory 460 that stores program codes and data. The memory 460 can be referred to as a computer-readable medium. In transmissions from the second communication device 410 to the second communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the core network. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals can also be provided to the L3 for L3 processing.

[0376] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, a data source 467 is used to provide upper layer data packets to a controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmit function at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations, implements L2 layer functionality for the user plane and control plane. The controller / processor 459 is also responsible for error detection, retransmission of lost packets, and signaling to the second communication device 410. A transmit processor 468 performs modulation mapping, channel coding processing, and a multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, and then the transmit processor 468 modulates the resulting spatial streams into multi-carrier / single-carrier symbol streams, which are then provided to different antennas 452 via transmitters 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency signal, and then provides the radio frequency signal to the antenna 452.

[0377] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the receive functions at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its respective antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to a multi-antenna receive processor 472 and a receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 collectively implement the functionality of the L1 layer. A controller / processor 475 implements the functionality of the L2 layer. The controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the UE 450. Upper layer data packets from the controller / processor 475 can be provided to a core network.

[0378] As one embodiment, the first communication device 450 comprises: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the first communication device 450 at least to: receive first signaling, the first signaling indicating a configuration of a first cell; perform a first handover from a source cell to the first cell; determine that the first handover failed; in response to the act of determining that the first handover failed, perform a first operation; wherein the act of performing a first handover from a source cell to the first cell comprises applying the configuration of the first cell; the first operation is one of a first set of candidate operations, the first set of candidate operations comprising at least returning to the source cell and performing a second handover; the first operation relates to at least whether the first node is configured to conditionally reconfigure a candidate cell; when the first node is not configured to conditionally reconfigure a candidate cell, the first operation is to return to the source cell.

[0379] As one embodiment, the first communication device 450 comprises: a memory storing a program of computer readable instructions to produce an action when executed by at least one processor, the action comprising: receiving first signaling, the first signaling indicating a configuration of a first cell; performing a first handover from a source cell to the first cell; determining that the first handover failed; in response to the act of determining that the first handover failed, performing a first operation; wherein the act of performing a first handover from a source cell to the first cell comprises applying the configuration of the first cell; the first operation is one of a first set of candidate operations, the first set of candidate operations comprising at least returning to the source cell and performing a second handover; the first operation relates to at least whether the first node is configured to conditionally reconfigure a candidate cell; when the first node is not configured to conditionally reconfigure a candidate cell, the first operation is to return to the source cell.

[0380] As one embodiment, the second communication device 410 includes at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the second communication device 410 at least to transmit first signaling, the first signaling indicating a configuration of a first cell; wherein a first handover from a source cell to the first cell is performed; a first handover failure is determined; in response to the first handover failure being determined, a first operation is performed; the act of performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation of a first set of candidate operations, the first set of candidate operations comprising at least a candidate operation of returning to the source cell and performing a second handover; the first operation relates to at least whether the first node is configured to at least one conditional reconfiguration candidate cell; when the first node is not configured to a conditional reconfiguration candidate cell, the first operation is returning to the source cell.

[0381] As one embodiment, the second communication device 410 includes a memory storing a program of computer readable instructions to produce an action when executed by at least one processor, the action comprising: transmitting first signaling, the first signaling indicating a configuration of a first cell; wherein a first handover from a source cell to the first cell is performed; a first handover failure is determined; in response to the first handover failure being determined, a first operation is performed; the act of performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation of a first set of candidate operations, the first set of candidate operations comprising at least a candidate operation of returning to the source cell and performing a second handover; the first operation relates to at least whether the first node is configured to at least one conditional reconfiguration candidate cell; when the first node is not configured to a conditional reconfiguration candidate cell, the first operation is returning to the source cell.

[0382] As one embodiment, the antenna 452, the receiver 454, the receive processor 456, the controller / processor 459 are configured to receive the first signaling; at least one of the antenna 420, the transmitter 418, the transmit processor 416, the controller / processor 475 are configured to transmit the first signaling.

[0383] As one embodiment, the antenna 452, the receiver 454, the receive processor 456, the controller / processor 459 are configured to receive the second signaling; at least one of the antenna 420, the transmitter 418, the transmit processor 416, the controller / processor 475 are configured to transmit the second signaling.

[0384] As an implementation, the antenna 452, the transmitter 454, the transmit processor 468, the controller / processor 459 are configured to transmit third signaling; at least one of the antenna 420, the receiver 418, the receive processor 470, the controller / processor 475 are configured to receive the third signaling.

[0385] As an implementation, the antenna 452, the receiver 454, the receive processor 456, the controller / processor 459 are configured to receive at least one of MIB or PBCH or Msg2 or Msg4 or MsgB; at least one of the antenna 420, the transmitter 418, the transmit processor 416, the controller / processor 475 are configured to transmit at least one of MIB or PBCH or Msg2 or Msg4 or MsgB.

[0386] As an implementation, the antenna 452, the transmitter 454, the transmit processor 468, the controller / processor 459 are configured to transmit Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message; at least one of the antenna 420, the receiver 418, the receive processor 470, the controller / processor 475 are configured to receive Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message.

[0387] As an implementation, the first communication device 450 corresponds to a first node in the present application.

[0388] As an implementation, the second communication device 410 corresponds to a second node in the present application.

[0389] As an implementation, the first communication device 450 is a user equipment.

[0390] As an implementation, the first communication device 450 is a user equipment supporting large latency difference.

[0391] As an implementation, the first communication device 450 is a user equipment supporting NTN.

[0392] As an implementation, the first communication device 450 is an aircraft equipment.

[0393] As one embodiment, the first communication device 450 is capable of positioning.

[0394] As one embodiment, the first communication device 450 is not capable of positioning.

[0395] As one embodiment, the first communication device 450 is a TN-capable user equipment.

[0396] As one embodiment, the second communication device 410 is a base station device (gNB / eNB / ng-eNB).

[0397] As one embodiment, the second communication device 410 is a base station device capable of supporting large latency differences.

[0398] As one embodiment, the second communication device 410 is a base station device capable of supporting NTN.

[0399] As one embodiment, the second communication device 410 is a satellite device.

[0400] As one embodiment, the second communication device 410 is a flying platform device.

[0401] As one embodiment, the second communication device 410 is a TN-capable base station device.

[0402] Example 5

[0403] Embodiment 5 illustrates a wireless signal transmission flowchart according to one embodiment of the present application, as shown in FIG. 5. Figure 5 It is particularly pointed out that the sequence in this example does not limit the sequence of signal transmission and the sequence of implementation in the present application.

[0404] For First node U01 In step S5101, a first signaling is received, the first signaling indicating a configuration of a first cell; in step S5102, a second signaling is received, the second signaling indicating a configuration of each of the at least one conditional reconfiguration candidate cell; in step S5103, a third signaling is sent, the third signaling being triggered by the second signaling; in step S5104, a second timer is started; in step S5105, a first handover from a source cell to the first cell is performed; in step S5106, the second timer expires; in step S5107, a first handover failure is determined; in step S5108, as a response to the behavior of determining the first handover failure, a first operation is performed, the first operation being performing a second handover; in step S5109, as a response to the behavior of determining the first handover failure, a first operation is performed, the first operation being returning to the source cell.

[0405] For Second node N02 In step S5201, the first signaling is transmitted; in step S5202, the second signaling is transmitted; in step S5203, the third signaling is received.

[0406] For Third node N03 In the step S5105, at least one of MIB or PBCH or Msg2 or Msg4 or MsgB is transmitted; at least one of Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message is received.

[0407] For Fourth node N04 In the step S5108, at least one of MIB or PBCH or Msg2 or Msg4 or MsgB is transmitted; at least one of Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message is received.

[0408] In embodiment 5, the behavior of performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprises at least two candidate operations of returning the source cell and performing a second handover; the first operation is related to at least one condition whether the first node U01 is configured at least one conditional reconfiguration candidate cell; when the first node U01 is not configured a conditional reconfiguration candidate cell, the first operation is to return the source cell.

[0409] As an embodiment, in the step S5105, the first node U01 receives at least one of MIB or PBCH or Msg2 or Msg4 or MsgB; transmits at least one of Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message.

[0410] As an embodiment, the first node U01 receives at least one of a MIB or a PBCH or a Msg2 or a Msg4 or a MsgB during the step S5108; transmits at least one of a Msg1 or a Msg3 or a MsgA or a RRCReconfigurationComplete message or a RRCConnectionReconfigurationComplete message.

[0411] As an embodiment, the third node N03 is a maintaining base station of the first cell.

[0412] As an embodiment, the fourth node N04 is a maintaining base station of the second cell.

[0413] As an embodiment, the third node N03 and the fourth node N04 are the same.

[0414] As an embodiment, the third node N03 and the fourth node N04 are different.

[0415] As an embodiment, the third node N03 and the second node N02 are the same.

[0416] As an embodiment, the third node N03 and the second node N02 are different.

[0417] As an embodiment, the second node N02 is a maintaining base station of the source cell.

[0418] As an embodiment, the first node U01 is a user equipment.

[0419] As an embodiment, the first node U01 is a relay device.

[0420] As an embodiment, the first node U01 is an loT device.

[0421] As an embodiment, the first node U01 is a test device.

[0422] As an embodiment, the second node N02 is a base station device.

[0423] As an embodiment, the second node N02 is a relay device.

[0424] As an embodiment, the third node N03 is a base station device.

[0425] As an embodiment, the third node N03 is a relay device.

[0426] As one embodiment, the fourth node N04 is a base station device.

[0427] As one embodiment, the fourth node N04 is a relay device.

[0428] As one embodiment, the second node N02 is a base station device, the third node N03 is a base station device, and the fourth node N04 is a base station device.

[0429] As one embodiment, the second node N02 is a base station device, the third node N03 is a base station device, and the fourth node N04 is a relay device.

[0430] As one embodiment, the second node N02 is a base station device, the third node N03 is a relay device, and the fourth node N04 is a relay device.

[0431] As one embodiment, the second node N02 is a base station device, the third node N03 is a relay device, and the fourth node N04 is a base station device.

[0432] As one embodiment, the second node N02 is a relay device, the third node N03 is a relay device, and the fourth node N04 is a relay device.

[0433] As one embodiment, the second node N02 is a relay device, the third node N03 is a base station device, and the fourth node N04 is a relay device.

[0434] As one embodiment, the second node N02 is a relay device, the third node N03 is a relay device, and the fourth node N04 is a base station device.

[0435] As one embodiment, the second node N02 is a relay device, the third node N03 is a base station device, and the fourth node N04 is a base station device.

[0436] As one embodiment, the second signaling is a DownLink (DL) message.

[0437] As one embodiment, the second signaling is a SideLink (SL) message.

[0438] As one embodiment, the second signaling is transmitted through SRB1.

[0439] As one embodiment, the second signaling is transmitted through SRB3.

[0440] As one embodiment, the second signaling is transmitted on a DCCH.

[0441] As one embodiment, the second signaling is an RRC layer message.

[0442] As one embodiment, the second signaling is used for configuration for conditional reconfiguration.

[0443] As one embodiment, the second signaling is used for configuration for CHO.

[0444] As one embodiment, the second signaling is used for configuration for CPC.

[0445] As one embodiment, the second signaling is used for configuration for conditional reconfiguration based handover.

[0446] As one embodiment, the second signaling includes at least one RRC message.

[0447] As one embodiment, the second signaling includes an RRCReconfiguration message.

[0448] As one embodiment, the second signaling includes an RRCConnectionReconfiguration message.

[0449] As one embodiment, the second signaling includes one RRC IE, the name of the one RRC IE includes CellGroupConfig.

[0450] As one embodiment, the second signaling includes one RRC IE, the name of the one RRC IE includes ServingCellConfigCommon.

[0451] As one embodiment, the second signaling includes one RRC IE, the name of the one RRC IE includes RACH-ConfigDedicated.

[0452] As one embodiment, the second signaling includes one RRC IE, the name of the one RRC IE includes RACH-ConfigDedicated.

[0453] As one embodiment, the second signaling includes one RRC field, the name of the one RRC field includes ReconfigurationWithSync.

[0454] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes mobilityControlInfo.

[0455] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes MobilityControlInfoSCG.

[0456] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes SpCellConfig.

[0457] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes masterCellGroup.

[0458] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes secondaryCellGroup.

[0459] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes ConditionalReconfiguration.

[0460] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigToAddModList.

[0461] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigurationToAddModList.

[0462] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes condReconfigurationId.

[0463] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes CondReconfigId.

[0464] As one embodiment, the second signaling includes an RRC IE, and the name of the RRC IE includes condExecutionCond.

[0465] As one embodiment, the second signaling includes an RRC field, and the name of the RRC field includes triggerCondition.

[0466] As one embodiment, the second signaling includes an RRC field, and the name of the RRC field includes condRRCReconfig.

[0467] As one embodiment, the second signaling includes an RRC field, and the name of the RRC field includes condReconfigurationToApply.

[0468] As one embodiment, one entry in the CondReconfigToAddMod IE in the second signaling corresponds to one candidate cell in the at least one conditional reconfiguration candidate cell.

[0469] As one embodiment, one entry in the CondReconfigurationToAddModList IE in the second signaling corresponds to one candidate cell in the at least one conditional reconfiguration candidate cell.

[0470] As one embodiment, one entry in the CondReconfigToAddMod IE in the second signaling includes a condReconfigId field, a condExecutionCond field, and a condRRCReconfig field, the condReconfigId field indicates one candidate cell in the at least one conditional reconfiguration candidate cell, the condExecutionCond field indicates an execution condition of the one candidate cell, and the condRRCReconfig field indicates a configuration of the one candidate cell.

[0471] As one embodiment, one entry in the CondReconfigurationToAddModList IE in the second signaling includes a condReconfigurationId field, a triggerCondition field, and a condReconfigurationToApply field, the condReconfigurationId field indicates one candidate cell in the at least one conditional reconfiguration candidate cell, the triggerCondition field indicates an execution condition of the one candidate cell, and the condReconfigurationToApply field indicates a configuration of the one candidate cell.

[0472] As an example, the phrase "second signaling indicates the configuration of each cell in the at least one conditional reconfiguration candidate cell" includes: the second signaling includes configuration information of each cell in the at least one conditional reconfiguration candidate cell.

[0473] As an example, the phrase "second signaling" indicating the configuration of each cell in the at least one conditional reconfiguration candidate cells includes: the second signaling being used to configure each cell in the at least one conditional reconfiguration candidate cells.

[0474] As an example, the phrase "second signaling" indicating the configuration of each cell in the at least one conditional reconfiguration candidate cells includes: the second signaling includes parameters for the synchronous reconfiguration to the first cell in the at least one conditional reconfiguration candidate cells.

[0475] As an example, the phrase second signaling indicating the configuration of each cell in the at least one conditional reconfiguration candidate cells includes: the second signaling includes cell-specific parameters for each cell in the at least one conditional reconfiguration candidate cells.

[0476] As an example, the second signaling includes the cell identifier of each cell in the at least one conditional reconfiguration candidate cell.

[0477] As an example, the second signaling includes the identifier of the first node U01 in each of the at least one conditional reconfiguration candidate cells.

[0478] As an example, it is determined whether the first node is configured with at least one conditional reconfiguration candidate cell based on whether the second signaling is received.

[0479] As a sub-implementation of this embodiment, if the second signaling is received, the first node is configured with at least one conditional reconfiguration candidate cell.

[0480] As a sub-example of this embodiment, if the second signaling is not received, the first node is not configured with at least one conditional reconfiguration candidate cell.

[0481] As a sub-embodiment of this embodiment, the second signaling includes a CondReconfigurationToAddModList, and the CondReconfigurationToAddModList includes at least one configuration identifier (ConditionalReconfigurationId).

[0482] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if no condReconfigurationToRemoveList is received, the first node is configured with at least one conditional reconfiguration candidate cell.

[0483] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if at least one condReconfigurationToRemoveList is received, but the at least one condReconfigurationToRemoveList does not include at least one of the at least one configuration identifier (ConditionalReconfigurationId), the first node is configured with at least one conditional reconfiguration candidate cell.

[0484] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if at least one condReconfigurationToRemoveList is received, and the at least one condReconfigurationToRemoveList includes all of the at least one configuration identifier (ConditionalReconfigurationId), the first node is not configured with at least one conditional reconfiguration candidate cell.

[0485] As a sub-embodiment of this embodiment, the second signaling includes a condReconfigToAddModList, and the condReconfigToAddModList includes at least one configuration identifier (CondReconfigId).

[0486] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if no condReconfigToRemoveList is received, the first node is configured with at least one conditional reconfiguration candidate cell.

[0487] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if at least one condReconfigToRemoveList is received, but none of the at least one configuration identity (CondReconfigId) is included in the at least one condReconfigToRemoveList, the first node is configured with at least one conditional reconfiguration candidate cell.

[0488] As a dependent embodiment of this sub-embodiment, after the second signaling is received, if at least one condReconfigToRemoveList is received, and all of the at least one configuration identity (CondReconfigId) is included in the at least one condReconfigToRemoveList, the first node is not configured with at least one conditional reconfiguration candidate cell.

[0489] As an embodiment, the third signaling is an uplink (UL) message.

[0490] As an embodiment, the third signaling is a side link (SL) message.

[0491] As an embodiment, the third signaling is transmitted over SRB1.

[0492] As an embodiment, the third signaling is transmitted over SRB3.

[0493] As an embodiment, the third signaling is transmitted over a DCCH.

[0494] As an embodiment, the third signaling is an RRC layer message.

[0495] As an embodiment, the third signaling comprises at least one RRC message.

[0496] As an embodiment, the third signaling comprises an RRCReconfigurationComplete message.

[0497] As an embodiment, the third signaling comprises an RRCConnectionReconfigurationComplete message.

[0498] As an embodiment, the third signaling is an acknowledgement message for the second signaling.

[0499] As an embodiment, the third signaling is sent in response to the second signaling being received.

[0500] As one embodiment, one DAPS bearer is configured during DAPS handover protocol stack is located at the source cell maintaining base station and the target cell maintaining base station to use the resources of the source cell maintaining base station and the target cell maintaining base station.

[0501] As one embodiment, the first bearer is one bearer during DAPS handover protocol stack is located at the second node N02 and the third node N03 to use the resources of the second node N02 and the third node N03; the first bearer is one DAPS bearer for the first cell.

[0502] As one embodiment, the second bearer is one bearer during DAPS handover protocol stack is located at the second node N02 and the fourth node N04 to use the resources of the second node N02 and the fourth node N04; the second bearer is one DAPS bearer for the second cell.

[0503] As one embodiment, for one DAPS bearer, the PDCP entity is associated to at least 2 UM (Unacknowledged Mode) RLC (Radio Link Control) entities.

[0504] As one embodiment, for one DAPS bearer, the PDCP entity is associated to 2 UM RLC entities.

[0505] As one embodiment, for one DAPS bearer, the PDCP entity is associated to 4 UM RLC entities.

[0506] As one embodiment, for one DAPS bearer, the PDCP entity is associated to at least 2 AM (Acknowledged Mode) RLC entities.

[0507] As one embodiment, for one DAPS bearer, the PDCP entity is associated to 2 AM RLC entities.

[0508] As one embodiment, for one DAPS bearer, the PDCP entity is associated to 4 AM RLC entities.

[0509] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell.

[0510] As one embodiment, the first signaling is used to indicate that the first bearer is configured.

[0511] As an embodiment, the first signaling includes a DRB-ToAddMod field, the DRB-ToAddMod field includes a drb-Identity field and a daps-Config field, a value of the drb-Identity field is set to an identity of one DRB, and a value of the daps-Config field is set to true, and the first bearer is the one DRB.

[0512] As an embodiment, the first signaling includes a DRB-ToAddMod field, the DRB-ToAddMod field includes a drb-Identity field and a daps-HO field, a value of the drb-Identity field is set to an identity of one DRB, and a value of the daps-HO field is set to true, and the first bearer is the one DRB.

[0513] As an embodiment, the first signaling indicates that at least one DRB is configured as a DAPS bearer for the first cell, and the first bearer is any DRB of the at least one DRB.

[0514] As an embodiment, if the first bearer is configured, at least one of the following behaviors is performed in response to the behavior determining that the first handover fails:

[0515] resetting a MAC for the first cell and releasing a MAC configuration for the first cell;

[0516] releasing an RLC entity and a related logical channel for the first cell for the first bearer;

[0517] reconfiguring a DAPS entity to release DAPS for the first bearer.

[0518] releasing a PDCP entity for the first cell for each SRB.

[0519] releasing an RLC entity and a related logical channel for the first cell for each SRB;

[0520] triggering a PDCP entity for the source cell to perform SDU (Service Data Unit) discard for each SRB;

[0521] reestablishing an RLC entity for the first cell for each SRB.

[0522] releasing a physical channel configuration for the first cell;

[0523] - if a key for the first cell is configured, discard the key for the first cell.

[0524] As one embodiment, the behavior performing the first handover from the source cell to the first cell further comprises at least one of the following behaviors if the first bearer is configured:

[0525] - create MAC entities of a cell group to which the first cell belongs with the same configuration as MAC entities of a cell group to which the source cell belongs;

[0526] - establish RLC entities in a cell group to which the first cell belongs with the same configuration as RLC entities in a cell group to which the source cell belongs for the first bearer, and establish logical channels in a cell group to which the first cell belongs with the same configuration as logical channels in a cell group to which the source cell belongs for the first bearer;

[0527] - establish RLC entities in a cell group to which the first cell belongs with the same configuration as RLC entities in a cell group to which the source cell belongs for each SRB, and establish logical channels in a cell group to which the first cell belongs with the same configuration as logical channels in a cell group to which the source cell belongs for the first bearer;

[0528] - suspend SRBs of a cell group to which the source cell belongs.

[0529] As one embodiment, the behavior performing the second handover comprises creating MAC entities of a cell group to which the first cell belongs with the same configuration as MAC entities of a cell group to which the first serving cell belongs if at least one DAPS bearer for the second cell is configured.

[0530] As one embodiment, the behavior performing the second handover comprises establishing RLC entities in a cell group to which the first cell belongs with the same configuration as RLC entities in a cell group to which the first serving cell belongs for the first bearer, and establishing logical channels in a cell group to which the first cell belongs with the same configuration as logical channels in a cell group to which the first serving cell belongs for the first bearer if at least one DAPS bearer for the second cell is configured.

[0531] As one embodiment, the behavior performing the second handover comprises: if at least one DAPS bearer for the second cell is configured, establishing RLC entities in the cell group to which the first cell belongs with the same RLC entity configuration as the RLC entities in the cell group to which the first serving cell belongs for each SRB, and establishing logical channels in the cell group to which the first cell belongs with the same logical channel configuration as the logical channels in the cell group to which the first serving cell belongs for the first bearer.

[0532] As one embodiment, the behavior performing the second handover comprises: if at least one DAPS bearer for the second cell is configured, suspending the SRBs of the first cell group.

[0533] As one embodiment, if at least one DAPS bearer for the second cell is configured, the behavior performing the second handover further comprises at least one of the following behaviors:

[0534] - creating MAC entities in the cell group to which the second cell belongs with the same MAC entity configuration as the MAC entities in the cell group to which the source cell belongs;

[0535] - if the first bearer is configured, establishing RLC entities in the cell group to which the second cell belongs with the same RLC entity configuration as the RLC entities in the cell group to which the source cell belongs for each of the at least one DAPS bearer of the second cell, and establishing logical channels in the cell group to which the second cell belongs with the same logical channel configuration as the logical channels in the cell group to which the source cell belongs for each of the at least one DAPS bearer of the second cell;

[0536] - if the first bearer is configured, establishing RLC entities in the cell group to which the second cell belongs with the same RLC entity configuration as the RLC entities in the cell group to which the source cell belongs for each SRB, and establishing logical channels in the cell group to which the second cell belongs with the same logical channel configuration as the logical channels in the cell group to which the source cell belongs for the first bearer;

[0537] - if the first bearer is configured, suspending the SRBs of the cell group to which the source cell belongs.

[0538] As one embodiment, no Radio Link Failure (RLF) of the source cell occurs during the first handover.

[0539] As one embodiment, the no Radio Link Failure of the source cell during the first handover comprises: during the first handover, no T310 of the source cell expires.

[0540] As one embodiment, the radio link failure does not occur in the source cell during the first handover includes: during the first handover, an indication of a random access problem indication (RAPIND) from a MAC of the cell group of the source cell is not received.

[0541] As one embodiment, the radio link failure does not occur in the source cell during the first handover includes: during the first handover, an indication of the maximum number of retransmissions has been reached from a RLC of the cell group of the source cell is not received.

[0542] As one embodiment, the radio link failure does not occur in the source cell during the first handover includes: during the first handover, a consistent uplink LBT (Listen Before Talk) failure indication from a MAC of the cell group of the source cell is not received.

[0543] As one embodiment, the radio link failure does not occur in the source cell during the first handover includes: during the first handover, an RLF of the cell group to which the source cell belongs is not detected.

[0544] As one embodiment, the first bearer is configured, the first bearer is a DAPS bearer for the first cell; and a radio link failure (RLF) does not occur in the source cell during the first handover.

[0545] As one embodiment, the step S5104 is optional.

[0546] As one embodiment, the step S5104 exists.

[0547] As one embodiment, the step S5104 does not exist.

[0548] As one embodiment, the step S5106 is optional.

[0549] As one embodiment, the step S5106 exists.

[0550] As one embodiment, the step S5106 does not exist.

[0551] As one embodiment, the step S5104 and the step S5106 are both present.

[0552] As one embodiment, the step S5104 and the step S5106 are both not present.

[0553] As one embodiment, the dashed box F5.1 is optional.

[0554] As one embodiment, the dashed box F5.1 is present.

[0555] As one sub embodiment of this embodiment, the at least one conditional reconfiguration candidate cell is configured.

[0556] As one sub embodiment of this embodiment, the second signal is received and the third signaling is sent.

[0557] As one embodiment, the dashed box F5.1 is not present.

[0558] As one sub embodiment of this embodiment, the at least one conditional reconfiguration candidate cell is not configured.

[0559] As one sub embodiment of this embodiment, the second signal is not received and the third signaling is not sent.

[0560] As one embodiment, the dashed box F5.2 is optional.

[0561] As one embodiment, the dashed box F5.2 is present.

[0562] As one embodiment, the dashed box F5.2 is not present.

[0563] As one embodiment, the dashed box F5.3 is optional.

[0564] As one embodiment, the dashed box F5.3 is present.

[0565] As one embodiment, the dashed box F5.3 is not present.

[0566] As one embodiment, one of the dashed box F5.2 and the dashed box F5.3 is present.

[0567] As one embodiment, the dashed box F5.2 and the dashed box F5.3 are not present at the same time.

[0568] Example 6

[0569] Embodiment 6 illustrates a first operation according to an embodiment of the present application and a diagram relating to whether there is at least one cell in which an execution condition is satisfied among at least one condition reconfiguration candidate cell during a first handover, as shown in FIG. 6. Figure 6

[0570] In Embodiment 6, the first node is configured at least one condition reconfiguration candidate cell; the first operation relates to whether there is at least one cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover; when there is no cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover, the first operation is to return the source cell.

[0571] As an embodiment, the first node is configured at least one condition reconfiguration candidate cell; the first operation relates to whether there is at least one cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover; when there is no cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover, the first operation is to return the source cell.

[0572] As an embodiment, the first node is configured at least one condition reconfiguration candidate cell; the first operation relates to whether there is at least one cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover; when there is no cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover, the first operation is to return the source cell.

[0573] As an embodiment, the at least one cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover includes determining that there is no cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell according to a last measurement result during the first handover.

[0574] As an embodiment, the at least one cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell during the first handover includes determining that there is no cell in which an execution condition is satisfied among the at least one condition reconfiguration candidate cell according to a last measurement result during the first handover.

[0575] As an embodiment, the first node evaluates an execution condition for the at least one condition reconfiguration candidate cell during the first handover.

[0576] ​As one embodiment, the phrase the first operation is related to whether there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled comprises whether there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled is used to determine the first operation.

[0577] As one embodiment, the phrase the first operation is related to whether there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled comprises whether there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled is used to determine whether to return to the source cell.

[0578] As one embodiment, when there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled, the first operation is not to return to the source cell.

[0579] As one embodiment, when there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover for which an execution condition is fulfilled, the first operation is to perform the second handover.

[0580] As one embodiment, the first handover period comprises the second timer is running.

[0581] As one embodiment, the first handover period refers to the period during which the second timer is running.

[0582] As one embodiment, whether an execution condition is fulfilled is determined according to section 5.3.5.13.4 of 3GPP TS 38.331.

[0583] As one embodiment, a candidate cell is considered to be a trigger cell if the measurement identity associated with the execution condition for the one candidate cell is associated with a trigger event that is fulfilled.

[0584] As one embodiment, if there is only one trigger cell, the one trigger cell is the selected cell.

[0585] As one embodiment, if there are at least two trigger cells, the first node selects one of the at least two trigger cells as the selected cell.

[0586] As one embodiment, if there are at least two trigger cells, one of the at least two trigger cells is the selected cell.

[0587] As an embodiment, if there are at least two triggering cells, and there are at least one triggering cell configured with DAPS bearer and at least one triggering cell not configured with DAPS bearer, one cell determined in the at least one triggering cell not configured with DAPS bearer is the selected cell.

[0588] As an embodiment, if there is only one cell whose execution condition is satisfied, the one cell whose execution condition is satisfied is the target cell of the second handover.

[0589] As an embodiment, if there are at least two cells whose execution condition is satisfied, the first node selects one of the at least two cells whose execution condition is satisfied as the target cell of the second handover.

[0590] As an embodiment, the execution condition refers to an execution condition of a conditional reconfiguration candidate cell.

[0591] As an embodiment, each candidate cell in the at least one conditional reconfiguration candidate cell is configured with an execution condition.

[0592] As an embodiment, for any candidate cell in the at least one conditional reconfiguration candidate cell, it is evaluated whether the execution condition of the any candidate cell is satisfied.

[0593] As an embodiment, the execution condition is related to at least one of a Reference Signal Received Power (RSRP) measurement result, or a Reference Signal Received Quality (RSRQ) measurement result, or a Signal to Interference plus Noise Ratio (SINR) measurement result.

[0594] As an embodiment, the execution condition includes an entering condition of Event A3 in 3GPP TS 38.331.

[0595] As an embodiment, the execution condition includes an entering condition of Event A5 in 3GPP TS 38.331.

[0596] As an embodiment, the execution condition is associated to at least one measurement identity (measId) associated to at least one of the above-mentioned Event A3 or the above-mentioned Event A5.

[0597] As one embodiment, it is determined whether there is at least one cell in the at least one conditional reconfiguration candidate cell in which the at least one execution condition is fulfilled.

[0598] Example 7

[0599] Embodiment 7 illustrates a scenario related to whether the first operation is related to whether at least one target cell in which the first node is not switched within a first time window is included in the at least one cell in which the at least one execution condition is fulfilled, according to one embodiment of the present application.

[0600] In embodiment 7, the first node is configured at least one conditional reconfiguration candidate cell, there is at least one cell in which the at least one execution condition is fulfilled in the at least one conditional reconfiguration candidate cell during the first handover, the first operation is related to whether at least one target cell in which the first node is not switched within a first time window is included in the at least one cell in which the at least one execution condition is fulfilled; when the at least one target cell in which the first node is not switched within a first time window is not included in the at least one cell in which the at least one execution condition is fulfilled, the first operation is to return to the source cell; when the at least one target cell in which the first node is not switched within a first time window is included in the at least one cell in which the at least one execution condition is fulfilled, the first operation is to perform the second handover.

[0601] As one embodiment, the at least one cell in which the at least one execution condition is fulfilled in the at least one conditional reconfiguration candidate cell during the first handover includes determining the at least one cell in which the at least one execution condition is fulfilled in the at least one conditional reconfiguration candidate cell according to the last measurement result during the first handover.

[0602] As one embodiment, the at least one cell in which the at least one execution condition is fulfilled in the at least one conditional reconfiguration candidate cell during the first handover includes determining the at least one cell in which the at least one execution condition is fulfilled in the at least one conditional reconfiguration candidate cell according to any measurement result during the first handover.

[0603] As one embodiment, the phrase that the first operation is related to whether at least one target cell in which the first node is not switched within a first time window is included in the at least one cell in which the at least one execution condition is fulfilled includes whether at least one target cell in which the first node is not switched within the first time window is included in the at least one cell in which the at least one execution condition is fulfilled is used to determine the first operation.

[0604] As one embodiment, the phrase the first operation is related to whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within a first time window includes whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within the first time window is used to determine whether to perform the second handover.

[0605] As one embodiment, the phrase the first operation is related to whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within a first time window includes whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within the first time window is used to determine whether to perform the second handover.

[0606] As one embodiment, the phrase the first operation is related to whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within a first time window includes whether the first operation is related to whether the first time window is running.

[0607] As one sub-embodiment of this embodiment, if the first time window is running, the first operation is to return to the source cell.

[0608] As one sub-embodiment of this embodiment, if the first time window is not running, the first operation is to perform the second handover.

[0609] As one embodiment, the phrase the first operation is related to whether at least one target cell in the cells for which the execution condition is met was not used for the first node to handover within a first time window includes whether the first operation is related to whether at least one of the cells for which the execution condition is met is not running within the first time window.

[0610] As one sub-embodiment of this embodiment, when none of the cells for which the execution condition is met is not running within the first time window, the first operation is to return to the source cell.

[0611] As one sub-embodiment of this embodiment, when at least one of the cells for which the execution condition is met is not running within the first time window, the first operation is to perform the second handover.

[0612] As one embodiment, the first time window is configured for the second cell.

[0613] As one embodiment, one of the first time windows is configured for each of the at least one conditional reconfiguration candidate cell.

[0614] As one embodiment, the first time window comprises a positive integer number of milliseconds.

[0615] As one embodiment, the first time window comprises a positive integer number of slots.

[0616] As one embodiment, the first time window comprises a timer.

[0617] As one embodiment, the first time window is a timer.

[0618] As one embodiment, the first time window is pre-configured.

[0619] As one embodiment, the first time window is configurable.

[0620] As one embodiment, the first time window is for the second cell.

[0621] As one embodiment, the first time window is for any of the at least one conditional reconfiguration candidate cell.

[0622] As one embodiment, the first time window is for all of the at least one conditional reconfiguration candidate cell.

[0623] As one embodiment, during the first time window, the second cell is not used as a target cell for handover by the first node.

[0624] As one embodiment, during the first time window, the second cell is not used for CHO handover.

[0625] As one embodiment, during the first time window, the first node does not evaluate execution conditions for the second cell.

[0626] As one embodiment, during the first time window, the first node evaluates execution conditions for each of the at least one conditional reconfiguration candidate cell except the second cell.

[0627] As one embodiment, during the first time window, each of the at least one conditional reconfiguration candidate cell is not used as a target cell for handover by the first node.

[0628] As one embodiment, during the first time window, each of the at least one conditional reconfiguration candidate cell is not used for CHO handover.

[0629] As one embodiment, the first node does not evaluate execution conditions for the at least one conditional reconfiguration candidate cell during the first time window is running.

[0630] As one embodiment, the second cell is not used for triggering cell during the first time window is running.

[0631] As one embodiment, the second cell is not used for selected cell during the first time window is running.

[0632] As one embodiment, the second cell is used for target cell for the first node to perform handover is used to determine to start the first time window.

[0633] As one embodiment, any of the at least one conditional reconfiguration candidate cell is used for target cell for the first node to perform handover is used to determine to start the first time window.

[0634] As one embodiment, the second cell can be used for target cell for the first node to perform handover if the first time window is not running.

[0635] As one embodiment, each of the at least one conditional reconfiguration candidate cell can be used for target cell for the first node to perform handover if the first time window is not running.

[0636] As one embodiment, the first time window is stopped if the configuration of the second cell is released.

[0637] As one embodiment, the first time window is considered expired if the configuration of the second cell is released.

[0638] As one embodiment, the first time window is released if the configuration of the second cell is released.

[0639] As one embodiment, the first time window is reset if the configuration of the second cell is released.

[0640] As one embodiment, the first time window is stopped if the configuration of the second cell is reconfigured.

[0641] As one embodiment, the first time window is reset if the configuration of the second cell is reconfigured.

[0642] As one embodiment, the first time window is reset and stopped if the configuration of the second cell is reconfigured.

[0643] As one embodiment, the first time window is stopped if the configuration of the at least one conditional reconfiguration candidate cell is released.

[0644] As one embodiment, the first time window is considered expired if the configuration of the at least one conditional reconfiguration candidate cell is released.

[0645] As one embodiment, the first time window is released if the configuration of the at least one conditional reconfiguration candidate cell is released.

[0646] As one embodiment, the first time window is reset if the configuration of the at least one conditional reconfiguration candidate cell is released.

[0647] Example 8

[0648] Embodiment 8 illustrates a diagram of a first operation according to an embodiment of the application in relation to whether there is at least one cell selection condition fulfilled cell in at least one conditional reconfiguration candidate cell during a running of a first timer.

[0649] In Embodiment 8, the first node is configured at least one conditional reconfiguration candidate cell; the first operation is in relation to whether there is at least one cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during a running of a first timer; when there is no cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during the running of the first timer, the first operation is to return to the source cell; the expiration of the first timer is used to determine that there is no cell selection condition fulfilled cell.

[0650] As one embodiment, the phrase the first operation is in relation to whether there is at least one cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during a running of a first timer includes that whether there is at least one cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during the running of the first timer is used to determine the first operation.

[0651] As one embodiment, the phrase the first operation is in relation to whether there is at least one cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during a running of a first timer includes that whether there is at least one cell selection condition fulfilled cell in the at least one conditional reconfiguration candidate cell during the running of the first timer is used to determine whether to return to the source cell.

[0652] As one embodiment, when there is at least one cell for which a cell selection condition is fulfilled among the at least one condition reconfiguration candidate cell during the running of the first timer, the first operation is not to return to the source cell.

[0653] As one embodiment, when there is at least one cell for which a cell selection condition is fulfilled among the at least one condition reconfiguration candidate cell during the running of the first timer, the first operation is to perform the second handover.

[0654] As one embodiment, the first timer is started in an RRC connection reestablishment procedure.

[0655] As one embodiment, the first timer is not started in an RRC connection reestablishment procedure.

[0656] As one embodiment, the first timer is T311.

[0657] As one embodiment, the first timer is an RRC layer timer.

[0658] As one embodiment, the first timer is a new timer.

[0659] As one embodiment, the first timer is started in response to the behavior determining the first handover failure.

[0660] As one embodiment, the first timer is started in response to the behavior determining the first handover failure.

[0661] As one embodiment, the first timer is stopped in response to determining that there is at least one cell for which a cell selection condition is fulfilled.

[0662] As one embodiment, the first timer is stopped if it is determined that there is at least one cell for which a cell selection condition is fulfilled.

[0663] As one embodiment, the first timer is stopped when it is determined that there is at least one cell for which a cell selection condition is fulfilled.

[0664] As one embodiment, the first timer is stopped when it is determined that there is one cell for which a cell selection condition is fulfilled.

[0665] As one embodiment, expiration of the first timer is used to determine that there is no cell for which a cell selection condition is fulfilled among the at least one condition reconfiguration candidate cell during the running of the first timer.

[0666] As one embodiment, the expiration of the first timer means that the running time of the first timer reaches an expiration value of the first timer.

[0667] As one embodiment, the expiration of the first timer means that the counting of the first timer reaches an expiration value of the first timer.

[0668] As one embodiment, the expiration value of the first timer is configurable.

[0669] As one embodiment, the expiration value of the first timer is pre-configured.

[0670] As one embodiment, the expiration value of the first timer is configured by RRC message.

[0671] As one embodiment, the expiration value of the first timer equals to a positive integer of millisecond.

[0672] As one embodiment, if there is only one cell that satisfies a cell selection condition, the one cell that satisfies the cell selection condition is the target cell of the second handover.

[0673] As one embodiment, if there are at least two cells that satisfy a cell selection condition, the first node selects one of the at least two cells that satisfy the cell selection condition as the target cell of the second handover.

[0674] As one embodiment, the cell selection condition means a criterion of cell selection.

[0675] As one embodiment, the cell selection condition does not mean a criterion of cell selection.

[0676] As one embodiment, the cell selection condition means an execution condition of conditional reconfiguration candidate cell.

[0677] As one embodiment, the cell selection condition does not mean an execution condition of conditional reconfiguration candidate cell.

[0678] As one embodiment, the cell selection condition is related to at least one of RSRP measurement result, or RSRQ measurement result, or SINR measurement result.

[0679] As one embodiment, the cell selection condition includes an entering condition of Event A4 in 3GPP TS 38.331.

[0680] As one embodiment, the cell selection condition includes an entering condition of Event A4 in 3GPP TS 36.331.

[0681] As one embodiment, the cell selection condition is associated to one measurement identity, the one measurement identity (measld) is associated to the A4 event.

[0682] As one embodiment, during the running of the first timer, cell selection is performed.

[0683] As one sub-embodiment of this embodiment, the cell selection is performed according to 3GPP TS 38.304.

[0684] As one sub-embodiment of this embodiment, the cell selection is performed according to 3GPP TS 36.304.

[0685] As one embodiment, during the running of the first timer, the at least one condition reconfiguration candidate cell is evaluated.

[0686] As one embodiment, during the running of the first timer, there is at least one cell for which a cell selection condition is fulfilled.

[0687] As one embodiment, during the running of the first timer, there is no cell for which a cell selection condition is fulfilled.

[0688] As one embodiment, it is determined whether there is at least one cell for which a cell selection condition is fulfilled only among the at least one condition reconfiguration candidate cell.

[0689] As one embodiment, it is determined whether there is at least one cell for which a cell selection condition is fulfilled among the at least one condition reconfiguration candidate cell and at least one cell other than the at least one condition reconfiguration candidate cell.

[0690] Example 9

[0691] Embodiment 9 illustrates a schematic diagram of the first operation according to one embodiment of the present application in relation to whether at least one cell for which a cell selection condition is fulfilled includes at least one target cell for which a handover is not performed within a first time window for a first signaling, as shown in FIG. 9. Figure 9

[0692] ​In embodiment 9, the first node is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is satisfied during running of a first timer, the first operation is related to whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within a first time window; when the at least one cell in the at least one cell selection condition satisfied cell does not include the target cell which is not used for the first node to perform handover within the first time window, the first operation is to return to the source cell; when the at least one cell in the at least one cell selection condition satisfied cell includes the target cell which is not used for the first node to perform handover within the first time window, the first operation is to perform the second handover.

[0693] As one embodiment, the phrase the first operation is related to whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within a first time window includes whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within the first time window is used to determine the first operation.

[0694] As one embodiment, the phrase the first operation is related to whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within a first time window includes whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within the first time window is used to determine whether to perform the second handover.

[0695] As one embodiment, the phrase the first operation is related to whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within a first time window includes whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within the first time window is used to determine whether the first operation is to return to the source cell or to perform the second handover.

[0696] As one embodiment, the phrase the first operation is related to whether the at least one cell in the at least one cell selection condition satisfied cell includes at least one target cell which is not used for the first node to perform handover within a first time window includes whether the first operation is related to whether the first time window is running.

[0697] As one sub-embodiment of this embodiment, if the first time window is running, the first operation is to return to the source cell.

[0698] As a sub-implementation of this embodiment, if the first time window is not running, the first operation is to perform the second switching.

[0699] As an example, the phrase "the first operation relating to whether the cells in which the at least one cell selection condition is met include at least one target cell that was not used for handover by the first node within the first time window" includes: the first operation relating to whether the cells in which the at least one execution condition is met include at least one cell that was not running within the first time window.

[0700] As a sub-implementation of this embodiment, when the cells whose at least one cell selection condition is met do not include cells that are not running in the first time window, the first operation is to return to the source cell.

[0701] As a sub-implementation of this embodiment, when the cells in which the at least one cell selection condition is satisfied include at least one cell that is not operating in the first time window, the first operation is to perform the second handover.

[0702] Example 10

[0703] Example 10 illustrates a schematic diagram of a first operation according to an embodiment of this application relating to whether a first counter reaches a first integer, as shown in the attached diagram. Figure 10 As shown.

[0704] In Example 10, the first node is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether the first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is incremented by 1.

[0705] As one embodiment, the phrase "the first operation relating to whether the first counter reaches a first integer" includes: whether the first counter reaches the first integer is used to determine whether to return to the source cell.

[0706] As one embodiment, the phrase "the first operation is related to whether the first counter reaches a first integer" includes: whether the first counter reaches the first integer is used to determine the first operation.

[0707] As an example, when the first counter reaches the first integer, the first operation does not return to the source cell.

[0708] As one embodiment, the first operation is performing the second handover when the first counter reaches the first integer.

[0709] As one embodiment, the first operation is performing RRC connection reestablishment when the first counter reaches the first integer.

[0710] As one embodiment, the first operation is entering RRC idle state when the first counter reaches the first integer.

[0711] As one embodiment, the first counter is increased by 1 each time returning to the source cell is performed.

[0712] As one embodiment, if the first node is configured the at least one conditional reconfiguration candidate cell, the first counter is increased by 1 each time performing handover from the source cell to one of the at least one conditional reconfiguration candidate cell fails, if returning to the source cell is performed.

[0713] As one embodiment, if the first node is configured the at least one conditional reconfiguration candidate cell, the first counter is increased by 1 each time performing handover from the source cell to a given cell fails, if returning to the source cell is performed.

[0714] As one subembodiment of this embodiment, the given cell is one of the at least one conditional reconfiguration candidate cell.

[0715] As one subembodiment of this embodiment, the given cell is not one of the at least one conditional reconfiguration candidate cell.

[0716] As one embodiment, the first counter is not increased by 1 if it is the first time returning to the source cell.

[0717] As one embodiment, the first counter is increased by 1 if it is the first time returning to the source cell.

[0718] As one embodiment, the first counter is used to determine the number of times returning to the source cell.

[0719] As one embodiment, the first counter is used to determine the number of times returning to the source cell after DAPS handover failure.

[0720] As one embodiment, the value of the first counter is a non-negative integer.

[0721] As one embodiment, the first integer is configured by RRC message.

[0722] As one embodiment, the first integer is pre-configured.

[0723] As one embodiment, the first integer is configurable.

[0724] As one embodiment, the first integer is a positive integer.

[0725] As one embodiment, the first integer is not greater than 8.

[0726] As one embodiment, the first integer is equal to 1.

[0727] As one embodiment, the first integer is equal to 2.

[0728] As one embodiment, if the first operation is not returning to the source cell, resetting the first counter.

[0729] As one embodiment, if the first counter is re-configured, resetting the first counter.

[0730] As one embodiment, if a network-triggered handover is performed, resetting the first counter.

[0731] As one embodiment, the resetting the first counter means setting a value of the first counter to 0.

[0732] As one embodiment, the resetting the first counter means setting the first counter to an initial value.

[0733] Example 11

[0734] Embodiment 11 illustrates a structural block diagram of a processing apparatus in a first node according to an embodiment of the present application; as shown in FIG. 11. In FIG. 11, the processing apparatus 1100 in the first node includes a first receiver 1101, a first transceiver 1102 and a first transmitter 1103. Figure 11 As shown in FIG. 11, the first receiver 1101 receives first signaling, the first signaling indicating a configuration of a first cell; performs a first handover from a source cell to the first cell; determines a first handover failure. Figure 11 As shown in FIG. 11, the first receiver 1101 receives first signaling, the first signaling indicating a configuration of a first cell; performs a first handover from a source cell to the first cell; determines a first handover failure.

[0735] The first receiver 1101 receives first signaling, the first signaling indicating a configuration of a first cell; performs a first handover from a source cell to the first cell; determines a first handover failure.

[0736] The first transceiver 1102 performs a first operation in response to the behavior of determining the first handover failure.

[0737] In Example 11, the behavior performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first set of candidate operations, the first set of candidate operations comprising at least a return to the source cell and a performance of a second handover; the first operation relates to whether the first node is configured with at least one conditional reconfiguration candidate cell; when the first node is not configured with a conditional reconfiguration candidate cell, the first operation is to return to the source cell.

[0738] As one embodiment, the first node is configured with at least one conditional reconfiguration candidate cell; the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied; when there is no cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied, the first operation is to return to the source cell.

[0739] As one embodiment, the first node is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied, the first operation relates to whether the at least one cell for which an execution condition is satisfied comprises at least one target cell that has not been used for handover of the first node within a first time window; when the at least one cell for which an execution condition is satisfied does not comprise at least one target cell that has not been used for handover of the first node within a first time window, the first operation is to return to the source cell; when the at least one cell for which an execution condition is satisfied comprises at least one target cell that has not been used for handover of the first node within a first time window, the first operation is to perform the second handover.

[0740] As one embodiment, the first node is configured with at least one conditional reconfiguration candidate cell; the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during running of a first timer for which a cell selection condition is satisfied; when there is no cell in the at least one conditional reconfiguration candidate cell during running of the first timer for which a cell selection condition is satisfied, the first operation is to return to the source cell; expiration of the first timer is used to determine that there is no cell for which a cell selection condition is satisfied.

[0741] As one embodiment, the first node is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell that has a cell selection condition satisfied during running of a first timer, the first operation is related to whether the at least one cell in the at least one conditional reconfiguration candidate cell that has the cell selection condition satisfied includes at least one target cell that is not used for the first node to perform handover within a first time window; when the at least one cell in the at least one conditional reconfiguration candidate cell that has the cell selection condition satisfied does not include the at least one target cell that is not used for the first node to perform handover within the first time window, the first operation is to return to the source cell; when the at least one cell in the at least one conditional reconfiguration candidate cell that has the cell selection condition satisfied includes the at least one target cell that is not used for the first node to perform handover within the first time window, the first operation is to perform the second handover.

[0742] As one embodiment, the first node is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is increased by 1.

[0743] As one embodiment, a first bearer is configured, the first bearer is a DAPS bearer for the first cell.

[0744] As one embodiment, the source cell does not have a radio link failure during the first handover.

[0745] As one embodiment, the first receiver 1101 starts a second timer with application of the configuration of the first cell; wherein expiration of the second timer is used to determine that the first handover fails.

[0746] As one embodiment, the first receiver 1101 determines that a second handover fails; in response to the behavior of determining that the second handover fails, the first node returns to the source cell.

[0747] As one embodiment, the first receiver 1101 receives second signaling, the second signaling indicates a configuration of each cell in the at least one conditional reconfiguration candidate cell; the first transmitter 1103 sends third signaling, the third signaling is triggered by the second signaling.

[0748] As one embodiment, the first transceiver 1102 receives at least one of MIB, PBCH, Msg2, Msg4, or MsgB; the first transceiver 1102 sends at least one of Msg1, Msg3, MsgA, RRCReconfigurationComplete message, or RRCConnectionReconfigurationComplete message.

[0749] As one embodiment, the first receiver 1101 includes the appendix to this application. Figure 4 The components include antenna 452, receiver 454, multi-antenna receiver processor 458, receiver processor 456, controller / processor 459, memory 460, and data source 467.

[0750] As one embodiment, the first receiver 1101 includes the appendix to this application. Figure 4 The antenna is 452, the receiver is 454, the multi-antenna receiver processor is 458, and the receiver processor is 456.

[0751] As one embodiment, the first receiver 1101 includes the appendix to this application. Figure 4 The antenna is 452, the receiver is 454, and the receiver processor is 456.

[0752] As one embodiment, the first transceiver 1102 includes the appendix to this application. Figure 4 The components include antenna 452, transmitter 454, multi-antenna transmit processor 457, transmit processor 468, receiver 454, multi-antenna receive processor 458, receive processor 456, controller / processor 459, memory 460, and data source 467.

[0753] As one embodiment, the first transceiver 1102 includes the appendix to this application. Figure 4 The components include antenna 452, transmitter 454, multi-antenna transmitting processor 457, transmitting processor 468, receiver 454, multi-antenna receiving processor 458, and receiving processor 456.

[0754] As one embodiment, the first transceiver 1102 includes the appendix to this application. Figure 4 The antenna is 452, the transmitter is 454, the transmitter processor is 468, the receiver is 454, and the receiver processor is 456.

[0755] As one embodiment, the first transmitter 1103 includes the appendix to this application. Figure 4 The components include antenna 452, transmitter 454, multi-antenna transmission processor 457, transmission processor 468, controller / processor 459, memory 460, and data source 467.

[0756] As one embodiment, the first transmitter 1103 comprises an antenna 452, a transmitter 454, a multi-antenna transmission processor 457, a transmission processor 468 in the apparatus 1100 as Figure 4

[0757] As one embodiment, the first transmitter 1103 comprises an antenna 452, a transmitter 454, a transmission processor 468 in the apparatus 1100 as Figure 4

[0758] Example 12

[0759] Embodiment 12 illustrates a structural block diagram of a processing apparatus in a second node according to an embodiment of the present application; as shown in FIG. 12. In FIG. 12, the processing apparatus 1200 in the second node comprises a second transmitter 1201 and a second receiver 1202. Figure 12 Figure 12 The second transmitter 1201 transmits first signaling, the first signaling indicating a configuration of a first cell;

[0760] The second transmitter 1201 transmits first signaling, the first signaling indicating a configuration of a first cell;

[0761] In Embodiment 12, a first handover from a source cell to the first cell is performed; a first handover failure is determined; a first operation is performed in response to the first handover failure being determined; the behavior of performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprising at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to at least whether the first node is configured at least one condition reconfiguration candidate cell; when the first node is not configured a condition reconfiguration candidate cell, the first operation is to return to the source cell.

[0762] As one embodiment, a receiver of the first signaling is configured at least one condition reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one condition reconfiguration candidate cell during the first handover that satisfies at least one execution condition; when there is no cell in the at least one condition reconfiguration candidate cell during the first handover that satisfies the execution condition, the first operation is to return to the source cell.

[0763] ​​​As one embodiment, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell whose execution condition is fulfilled during the first switching, the first operation is related to whether there is at least one target cell in the at least one cell whose execution condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window; when there is no target cell in the at least one cell whose execution condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window, the first operation is to return to the source cell; when there is a target cell in the at least one cell whose execution condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window, the first operation is to perform the second switching.

[0764] As one embodiment, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is fulfilled during a running of a first timer; when there is no cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is fulfilled during the running of the first timer, the first operation is to return to the source cell; expiration of the first timer is used to determine that there is no cell whose cell selection condition is fulfilled.

[0765] As one embodiment, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is fulfilled during a running of a first timer, the first operation is related to whether there is at least one target cell in the at least one cell whose cell selection condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window; when there is no target cell in the at least one cell whose cell selection condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window, the first operation is to return to the source cell; when there is a target cell in the at least one cell whose cell selection condition is fulfilled which is not used for the receiver of the first signaling to switch within a first time window, the first operation is to perform the second switching.

[0766] As one embodiment, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is increased by 1.

[0767] As one embodiment, the first bearer is configured, the first bearer is one DAPS bearer for the first cell.

[0768] As one embodiment, the source cell does not experience radio link failure during the first handover.

[0769] As one embodiment, the configuration accompanying the first cell is applied, a second timer is started; expiration of the second timer is used to determine the first handover failure.

[0770] As one embodiment, the source cell is returned to as a response to the behavior determining the second handover failure.

[0771] As one embodiment, the second transmitter 1201 transmits second signaling, the second signaling indicates configuration of each cell in the at least one conditional reconfiguration candidate cell; the second receiver 1202 receives third signaling, the third signaling is triggered by the second signaling.

[0772] As one embodiment, the second transmitter 1201 transmits at least one of MIB or PBCH or Msg2 or Msg4 or MsgB; the second receiver 1202 receives at least one of Msg1 or Msg3 or MsgA or RRCReconfigurationComplete message or RRCConnectionReconfigurationComplete message.

[0773] As one embodiment, the second transmitter 1201 includes the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, the controller / processor 475, and the memory 476 in the apparatus 400 of the present application. Figure 4

[0774] As one embodiment, the second transmitter 1201 includes the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416 in the apparatus 400 of the present application. Figure 4

[0775] As one embodiment, the second transmitter 1201 includes the antenna 420, the transmitter 418, the transmission processor 416 in the apparatus 400 of the present application. Figure 4

[0776] As one embodiment, the second receiver 1202 includes the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470, the controller / processor 475, and the memory 476 in the apparatus 400 of the present application. Figure 4 As one embodiment, the second receiver 1202 includes the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 in the apparatus 400 of the present application.​​​

[0777] As one embodiment, the second receiver 1202 comprises the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 in the apparatus 1200. Figure 4 As one embodiment, the second receiver 1202 comprises the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 in the apparatus 1200.

[0778] As one embodiment, the second receiver 1202 comprises the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 in the apparatus 1200. Figure 4 As one embodiment, the second receiver 1202 comprises the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 in the apparatus 1200.

[0779] Example 13

[0780] Embodiment 13 illustrates a flowchart of a second handover failure being used to determine to return to a source cell according to one embodiment of the present application, as shown in FIG. 13. It is particularly pointed out that the order in this example does not limit the order of signal transmission and implementation in the present application. Figure 13

[0781] In embodiment 13, in step S13.1, a first handover failure is determined; in step S13.2, as a response to the act of determining the first handover failure, it is determined that the first operation is to perform the second handover; in step S13.3, a second handover failure is determined; in step S13.4, as a response to the act of determining the second handover failure, the source cell is returned to.

[0782] As one embodiment, a timer T304 is started along with initiating the second handover; expiration of the timer T304 is used to determine the second handover failure.

[0783] As one embodiment, a random access failure on the second cell is used to determine the second handover failure.

[0784] As one embodiment, a downlink synchronization to the second cell is used to determine the second handover failure.

[0785] As one embodiment, a MIB or PBCH of the second cell is not received to determine the second handover failure.

[0786] As one embodiment, a configuration of the source cell is not released within a time interval between a time of determining the first handover failure and a time of determining the second handover failure.

[0787] As one embodiment, a configuration of the source cell is maintained within a time interval between a time of determining the first handover failure and a time of determining the second handover failure.

[0788] ​As one embodiment, the configuration of the source cell is suspended for a time interval between the time instance when the first handover failure is determined and the time instance when the second handover failure is determined.

[0789] As one embodiment, the second bearer is configured, the second bearer being a DAPS bearer for the second cell.

[0790] As one embodiment, no radio link failure occurs in the source cell during the second handover.

[0791] As one embodiment, the second bearer is configured, the second bearer being a DAPS bearer for the second cell, and no radio link failure occurs in the source cell during the second handover.

[0792] As one embodiment, if the second bearer is configured, the behavior of performing the second handover further comprises at least one of the following behaviors:

[0793] - creating a MAC entity of a cell group to which the second cell belongs, which is configured identically to a MAC entity of a cell group to which the source cell belongs;

[0794] - establishing, for the second bearer, an RLC entity in a cell group to which the second cell belongs, which is configured identically to an RLC entity in a cell group to which the source cell belongs, and establishing, for the second bearer, a logical channel in a cell group to which the second cell belongs, which is configured identically to a logical channel in a cell group to which the source cell belongs;

[0795] - establishing, for each SRB, an RLC entity in a cell group to which the second cell belongs, which is configured identically to an RLC entity in a cell group to which the source cell belongs, and establishing, for the second bearer, a logical channel in a cell group to which the second cell belongs, which is configured identically to a logical channel in a cell group to which the source cell belongs;

[0796] - suspending SRBs of a cell group to which the source cell belongs.

[0797] As one embodiment, in response to the behavior of determining the first handover failure, if the first node is configured with a conditional reconfiguration candidate cell and the second bearer is configured, all or part of the following behaviors are not performed:

[0798] - resetting for the source MAC and releasing the configuration for the source MAC;

[0799] - releasing, for the first bearer, the RLC entity and the related logical channel for the source cell;

[0800] - reconfigure the DAPS entity for the first bearer to release DAPS;

[0801] - release the PDCP entity for the source cell for each SRB;

[0802] - release the RLC entity and related logical channel for the source cell for each SRB;

[0803] - release the physical channel configuration for the source cell;

[0804] - discard the keys for the source cell if configured.

[0805] As one embodiment, if the second bearer is not configured, or the radio link failure occurs in the source cell during the second handover, enter the RRC idle state as a response to the behavior determining the second handover failure.

[0806] As one embodiment, if the second bearer is not configured, the second bearer is a DAPS bearer for the second cell, or the radio link failure occurs in the source cell during the second handover, perform the RRC connection reestablishment procedure as a response to the behavior determining the second handover failure.

[0807] As one sub-embodiment of this embodiment, in the RRC connection reestablishment procedure, send the RRCReestablishmentRequest message or the RRCConnectionReestablishmentRequest message.

[0808] As one sub-embodiment of this embodiment, in the RRC connection reestablishment procedure, receive the RRCReestablishment message or the RRCConnectionReestablishment message.

[0809] As one sub-embodiment of this embodiment, in the RRC connection reestablishment procedure, send the RRCReestablishmentComplete message or the RRCConnectionReestablishmentComplete message.

[0810] As one sub-embodiment of this embodiment, in the RRC connection reestablishment procedure, receive the RRCReconfiguration message or the RRCConnectionReconfiguration message.

[0811] As a sub-embodiment of the embodiment, an RRCReconfigurationComplete message or an RRCConnectionReconfigurationComplete message is sent in the RRC connection reestablishment procedure.

[0812] As an embodiment, the second bearer and the first bearer correspond to a same DRB.

[0813] As an embodiment, the second bearer and the first bearer correspond to different DRBs.

[0814] A person of ordinary skill in the art can understand that all or part of the steps in the above method can be instructed by a program to relevant hardware, and the program can be stored in a computer readable storage medium, such as a read-only memory, a hard disk, an optical disk, or the like. Alternatively, all or part of the steps of the above embodiment can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of combination of software and hardware. The user equipment, terminal, and UE in the present application include but are not limited to a drone, a communication module on a drone, a remote control airplane, a flying vehicle, a small airplane, a mobile phone, a tablet computer, a notebook computer, a vehicle-mounted communication device, a wireless sensor, a network card, an Internet of Things terminal, an RFID terminal, an NB-IOT terminal, an MTC (Machine Type Communication) terminal, an eMTC (enhanced MTC) terminal, a data card, a network card, a vehicle-mounted communication device, a low-cost mobile phone, a low-cost tablet computer, and the like wireless communication devices. The base station or system device in the present application includes but is not limited to a macro cellular base station, a micro cellular base station, a home base station, a relay base station, a gNB (NR Node B), an NR Node B, a TRP (Transmitter Receiver Point), and the like wireless communication devices.

[0815] The above describes only the preferred embodiments of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A first node configured for wireless communication, the first node comprising: Comprising: a first receiver configured to receive first signaling, the first signaling indicating a configuration of a first cell; performing a first handover from a source cell to the first cell; determining that the first handover fails; a first transceiver configured to perform a first operation in response to the determining that the first handover fails; wherein the performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set comprising at least a returning to the source cell and a performing a second handover; the first operation is related to whether the first node is configured at least one conditional reconfiguration candidate cell; when the first node is not configured the conditional reconfiguration candidate cell, the first operation is returning to the source cell.

2. The first node of claim 1, characterized in that, the first node is configured at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover that satisfies at least one execution condition; when there is no cell in the at least one conditional reconfiguration candidate cell during the first handover that satisfies the execution condition, the first operation is returning to the source cell.

3. The first node of claim 1 or 2, wherein, the first node is configured at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover that satisfies at least one execution condition, the first operation is related to whether the at least one cell that satisfies the execution condition comprises at least one target cell that is not used for the first node to perform handover within a first time window; when the at least one cell that satisfies the execution condition does not comprise the target cell that is not used for the first node to perform handover within the first time window, the first operation is returning to the source cell; when the at least one cell that satisfies the execution condition comprises the target cell that is not used for the first node to perform handover within the first time window, the first operation is performing the second handover.

4. The first node of claim 1, characterized by the first node is configured at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during a running of a first timer that satisfies at least one cell selection condition; when there is no cell in the at least one conditional reconfiguration candidate cell during the running of the first timer that satisfies the cell selection condition, the first operation is returning to the source cell; the expiration of the first timer is used to determine that there is no cell that satisfies the cell selection condition.

5. The first node of claim 1 or 4, characterized by, The first node is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in which a cell selection condition is satisfied during running of a first timer, the first operation is related to whether at least one target cell in which the cell selection condition is satisfied is not used for the first node to perform handover within a first time window; when the target cell in which the cell selection condition is satisfied is not included in the first time window, the first operation is to return to the source cell; when the target cell in which the cell selection condition is satisfied is included in the first time window, the first operation is to perform the second handover.

6. The first node of claim 1, wherein, The first node is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell. If the first operation is to return to the source cell, the first counter is increased by 1.

7. The first node of claim 1, wherein, The first bearer is configured, and the first bearer is a DAPS bearer for the first cell.

8. The first node of claim 7, wherein, No radio link failure occurs in the source cell during the first handover.

9. A second node configured for wireless communication, the second node comprising: Comprise: The second transmitter transmits first signaling, the first signaling indicating a configuration of the first cell; Wherein, the first handover from the source cell to the first cell is performed; the first handover failure is determined; in response to the first handover failure being determined, the first operation is performed; the first handover from the source cell to the first cell includes applying the configuration of the first cell; the first operation is one of a first candidate operation set, the first candidate operation set including at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to whether a receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; when the receiver of the first signaling is not configured with the conditional reconfiguration candidate cell, the first operation is to return to the source cell.

10. The second node of claim 9, wherein, The receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in which an execution condition is satisfied in the at least one conditional reconfiguration candidate cell during the first handover; When there is no cell in which the execution condition is satisfied in the at least one conditional reconfiguration candidate cell during the first handover, the first operation is to return to the source cell.

11. The second node of claim 9 or 10, wherein, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled execution condition during the first switching, the first operation is related to whether the at least one cell that has the fulfilled execution condition includes at least one target cell that is not used for the receiver of the first signaling to perform switching within a first time window; when the at least one cell that has the fulfilled execution condition does not include the target cell that is not used for the receiver of the first signaling to perform switching within the first time window, the first operation is to return to the source cell; when the at least one cell that has the fulfilled execution condition includes the target cell that is not used for the receiver of the first signaling to perform switching within the first time window, the first operation is to perform the second switching.

12. The second node of claim 9, wherein, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled cell selection condition during running of a first timer; when there is no cell in the at least one conditional reconfiguration candidate cell that has the fulfilled cell selection condition during running of the first timer, the first operation is to return to the source cell; expiration of the first timer is used to determine that there is no cell that has the fulfilled cell selection condition.

13. The second node of claim 9, wherein, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell that has a fulfilled cell selection condition during running of a first timer, the first operation is related to whether the at least one cell that has the fulfilled cell selection condition includes at least one target cell that is not used for the receiver of the first signaling to perform switching within a first time window; when the at least one cell that has the fulfilled cell selection condition does not include the target cell that is not used for the receiver of the first signaling to perform switching within the first time window, the first operation is to return to the source cell; when the at least one cell that has the fulfilled cell selection condition includes the target cell that is not used for the receiver of the first signaling to perform switching within the first time window, the first operation is to perform the second switching.

14. The second node of claim 9, wherein, the receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; the first counter is increased by 1 if the first operation is to return to the source cell.

15. The second node of claim 9, wherein, a first bearer is configured, the first bearer is one DAPS bearer for the first cell.

16. The second node of claim 9, wherein, no radio link failure of the source cell occurs during the first handover.

17. The second node of claim 9, wherein, a second timer is started in conjunction with the configuration of the first cell being applied; expiration of the second timer is used to determine that the first handover fails.

18. The second node of claim 9, wherein, returning to the source cell is performed in response to determining that a second handover fails.

19. The second node of claim 18, wherein, the second transmitter transmits second signaling indicating a configuration of each of the at least one conditional reconfiguration candidate cell; the second receiver receives third signaling triggered by the second signaling.

20. A method in a first node used for wireless communication, characterized by, comprising: receiving first signaling indicating a configuration of a first cell; performing a first handover from a source cell to the first cell; determining that the first handover fails; performing a first operation in response to the determining that the first handover fails; wherein the performing the first handover from the source cell to the first cell comprises applying the configuration of the first cell; the first operation is one candidate operation from a first set of candidate operations, the first set of candidate operations comprising at least returning to the source cell and performing a second handover; the first operation is related to whether the first node is configured at least one conditional reconfiguration candidate cell; when the first node is not configured a conditional reconfiguration candidate cell, the first operation is returning to the source cell.

21. The method in the first node of claim 20, wherein, the first node is configured at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied; when there is no cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied, the first operation is returning to the source cell.

22. The method in the first node of claim 20 or 21, wherein, the first node is configured at least one conditional reconfiguration candidate cell; there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is satisfied; the first operation is related to whether the at least one cell for which an execution condition is satisfied includes at least one target cell that is not used for the first node to perform a handover within a first time window; when the at least one cell for which an execution condition is satisfied does not include at least one target cell that is not used for the first node to perform a handover within a first time window, the first operation is returning to the source cell; when the at least one cell for which an execution condition is satisfied includes at least one target cell that is not used for the first node to perform a handover within a first time window, the first operation is performing the second handover.

23. The method in the first node of claim 20, wherein, The first node is configured with at least one conditional reconfiguration candidate cell; the first operation is related to whether there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is satisfied during running of a first timer; When there is no cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is satisfied during running of the first timer, the first operation is to return to the source cell; The expiration of the first timer is used to determine that there is no cell whose cell selection condition is satisfied.

24. The method in the first node according to claim 20 or 23, wherein The receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell whose cell selection condition is satisfied during running of a first timer, and the first operation is related to whether at least one target cell in the at least one cell whose cell selection condition is satisfied is not used for the receiver of the first signaling to perform handover within a first time window; when the at least one target cell in the at least one cell whose cell selection condition is satisfied is not used for the receiver of the first signaling to perform handover within the first time window, the first operation is to return to the source cell; when the at least one target cell in the at least one cell whose cell selection condition is satisfied is used for the receiver of the first signaling to perform handover within the first time window, the first operation is to perform the second handover.

25. The method in the first node according to claim 20, wherein The receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell, and the first operation is related to whether a first counter reaches a first integer; when the first counter does not reach the first integer, the first operation is to return to the source cell; If the first operation is to return to the source cell, the first counter is increased by 1.

26. The method in the first node according to claim 20, wherein A first bearer is configured, and the first bearer is one DAPS bearer for the first cell.

27. The method in the first node according to claim 26, wherein No radio link failure occurs in the source cell during the first handover.

28. A method in a second node used for wireless communication, characterized by: Comprising: Sending first signaling, the first signaling indicating a configuration of a first cell; wherein a first handover from a source cell to the first cell is performed; a first handover failure is determined; in response to the first handover failure being determined, a first operation is performed; the performing of the first handover from the source cell to the first cell includes applying the configuration of the first cell; the first operation is one candidate operation in a first candidate operation set, the first candidate operation set including at least two candidate operations of returning to the source cell and performing a second handover; the first operation is related to whether a receiver of the first signaling is configured with at least one conditional reconfiguration candidate cell; when the receiver of the first signaling is not configured with a conditional reconfiguration candidate cell, the first operation is to return to the source cell.

29. A method in a second node according to claim 28, wherein the recipient of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled; the first operation is to return to the source cell when there is no cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled.

30. A method in a second node according to claim 28 or 29, wherein the recipient of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell during the first handover for which an execution condition is fulfilled, the first operation relates to whether the at least one cell for which an execution condition is fulfilled comprises at least one target cell within a first time window that has not been used for the recipient to perform a handover; the first operation is to return to the source cell when the at least one cell for which an execution condition is fulfilled does not comprise at least one target cell within a first time window that has not been used for the recipient to perform a handover; the first operation is to perform the second handover when the at least one cell for which an execution condition is fulfilled comprises at least one target cell within a first time window that has not been used for the recipient to perform a handover.

31. A method in a second node according to claim 28, wherein the recipient of the first signaling is configured with at least one conditional reconfiguration candidate cell; the first operation relates to whether there is at least one cell in the at least one conditional reconfiguration candidate cell during running of a first timer for which a cell selection condition is fulfilled; the first operation is to return to the source cell when there is no cell in the at least one conditional reconfiguration candidate cell during running of the first timer for which a cell selection condition is fulfilled; expiration of the first timer is used to determine that there is no cell for which a cell selection condition is fulfilled.

32. A method in a second node according to claim 28, wherein the recipient of the first signaling is configured with at least one conditional reconfiguration candidate cell, there is at least one cell in the at least one conditional reconfiguration candidate cell during running of a first timer for which a cell selection condition is fulfilled, the first operation relates to whether the at least one cell for which a cell selection condition is fulfilled comprises at least one target cell within a first time window that has not been used for the recipient to perform a handover; the first operation is to return to the source cell when the at least one cell for which a cell selection condition is fulfilled does not comprise at least one target cell within a first time window that has not been used for the recipient to perform a handover; the first operation is to perform the second handover when the at least one cell for which a cell selection condition is fulfilled comprises at least one target cell within a first time window that has not been used for the recipient to perform a handover.

33. The method in a second node according to claim 28, wherein the receiver of the first signaling is configured at least one conditional reconfiguration candidate cell, the first operation is related to whether a first counter reaches a first integer number; when the first counter does not reach the first integer number, the first operation is to return to the source cell; if the first operation is to return to the source cell, the first counter is increased by 1.

34. The method in a second node according to claim 28, wherein a first bearer is configured, the first bearer is one DAPS bearer for the first cell.

35. The method in a second node according to claim 28, wherein no radio link failure occurs at the source cell during the first handover.

36. The method in a second node according to claim 28, wherein a second timer is started with the configuration of the first cell applied; expiration of the second timer is used to determine the first handover failure.

37. The method in a second node according to claim 28, wherein returning to the source cell is performed as a response to determining a second handover failure.

38. A method in a second node according to claim 37, characterised by, comprising: sending second signaling, the second signaling indicates a configuration of each cell in the at least one conditional reconfiguration candidate cell; receiving third signaling, the third signaling is triggered by the second signaling.

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