Cell change failure handling method, apparatus, communication device, and storage medium

Abstract

The present disclosure relates to a cell change failure handling method and apparatus, a communication apparatus, and a storage medium, wherein the cell change failure handling method comprises: determining at least one cell change failure; and performing connection recovery. According to the present disclosure, the terminal can perform connection recovery in the case of determining at least one cell change failure, and recover the connection with the cell, thereby ensuring that the terminal can continue to maintain communication without causing communication interruption due to the lack of a connected cell caused by at least one cell change failure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and in particular, to a cell change failure processing method, a cell change failure processing apparatus, a communication apparatus, and a computer readable storage medium. BACKGROUND

[0002] In some scenarios, a terminal can perform cell change, but due to various factors, the cell change operation cannot be guaranteed to be successful, and there can be a case of cell change failure. SUMMARY

[0003] The present embodiment proposes a cell change failure processing method, a cell change failure processing apparatus, a communication apparatus, and a computer readable storage medium to solve the technical problems in the related art.

[0004] According to a first aspect of embodiments of the present disclosure, a cell change failure processing method is provided, performed by a terminal, and the method comprises: determining at least one cell change failure; performing connection recovery.

[0005] According to a second aspect of embodiments of the present disclosure, a cell change failure processing method is provided, performed by a network device, and the method comprises: in the case of at least one cell change failure of a terminal, performing connection recovery with the terminal.

[0006] According to a third aspect of embodiments of the present disclosure, a cell change failure processing apparatus is provided, and the apparatus comprises: a processing module configured to determine at least one cell change failure; a connection module configured to perform connection recovery.

[0007] According to a fourth aspect of embodiments of the present disclosure, a cell change failure processing apparatus is provided, and the apparatus comprises: a connection module configured to, in the case of at least one cell change failure of a terminal, perform connection recovery with the terminal.

[0008] According to a fifth aspect of embodiments of the present disclosure, a cell change failure processing system is provided, comprising a terminal and a network device, wherein the terminal is configured to implement the above-mentioned cell change failure processing method performed by the terminal, and the network device is configured to implement the above-mentioned cell change failure processing method performed by the network device.

[0009] According to a sixth aspect of embodiments of the present disclosure, a communication apparatus is provided, comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the above-mentioned cell change failure processing method performed by the terminal is implemented.

[0010] According to a seventh aspect of the embodiments of the present disclosure, a communication apparatus is provided, comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the cell change failure processing method performed by the network device is implemented.

[0011] According to an eighth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided for storing a computer program, when the computer program is executed by a processor, the cell change failure processing method performed by the terminal is implemented.

[0012] According to a ninth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided for storing a computer program, when the computer program is executed by a processor, the cell change failure processing method performed by the network device is implemented.

[0013] According to the embodiments of the present disclosure, in the case of determining at least one cell change failure, the terminal can perform connection recovery to restore the connection with the cell, so as to ensure that the terminal can continue to maintain communication without causing communication interruption due to the lack of connected cells caused by at least one cell change failure. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.

[0015] Figure 1 is a schematic flow chart of a cell change failure processing method according to an embodiment of the present disclosure.

[0016] Figure 2 is a schematic flow chart of another cell change failure processing method according to an embodiment of the present disclosure.

[0017] Figure 3 is a schematic flow chart of still another cell change failure processing method according to an embodiment of the present disclosure.

[0018] Figure 4 is a schematic flow chart of still another cell change failure processing method according to an embodiment of the present disclosure.

[0019] Figure 5 is a schematic flow chart of still another cell change failure processing method according to an embodiment of the present disclosure.

[0020] Figure 6is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0021] Figure 7 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0022] Figure 8 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0023] Figure 9 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0024] Figure 10 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0025] Figure 11 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0026] Figure 12 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0027] Figure 13 is a schematic flowchart of still another cell change failure handling method according to an embodiment of the present disclosure.

[0028] Figure 14 is a schematic block diagram of a cell change failure handling apparatus according to an embodiment of the present disclosure.

[0029] Figure 15 is a schematic block diagram of a cell change failure handling apparatus according to an embodiment of the present disclosure.

[0030] Figure 16 is a schematic block diagram of an apparatus for cell change failure handling according to an embodiment of the present disclosure.

[0031] Figure 17 is a schematic block diagram of an apparatus for cell change failure handling according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present disclosure.

[0033] The terminology used in the disclosure embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure embodiments. As used in the description of the disclosure embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0034] It should be understood that although the terms first, second, third, etc. can be used herein to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the disclosure embodiments, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining".

[0035] For the purpose of brevity and clarity, the terms "greater than" or "less than", "higher than" or "lower than" are used herein when characterizing a size relationship. However, it can be understood by those skilled in the art that the term "greater than" also covers the meaning of "greater than or equal to", and the term "less than" also covers the meaning of "less than or equal to"; the term "higher than" covers the meaning of "higher than or equal to", and the term "lower than" covers the meaning of "lower than or equal to".

[0036] Figure 1 is a schematic flow chart of a cell change failure processing method according to an embodiment of the disclosure. The cell change failure processing method shown in the embodiment can be executed by a terminal, which includes but is not limited to a mobile phone, a tablet computer, a wearable device, a sensor, an Internet of Things device, and the like. The terminal can communicate with a network device, which includes but is not limited to a network device in a 4G, 5G, 6G, and the like communication system, such as a base station, a core network, and the like.

[0037] As shown in Figure 1 The cell change failure processing method can include the following steps:

[0038] In step S101, at least one cell change (Switch) failure is determined;

[0039] In step S102, connection recovery is performed.

[0040] It should be noted that in one embodiment, at least one cell change (Switch) is different from the cell handover (handover) in the related art.

[0041] In related technologies, cell measurement operations during cell handover are performed at L3 (Layer 3), and cell selection / reselection operations are required. The cell handover process is based on RRC signaling. However, in the embodiments of this disclosure, the measurement operations for at least one cell change are performed at L1 (Layer 1), and cell selection / reselection operations are not required, nor is it based on RRC signaling.

[0042] In one embodiment, at least one cell can be considered as a set of cells, which contains one or more cells. Where the set contains multiple cells, each cell may belong to the same type, or at least two cells may belong to different types. This embodiment is applicable to any subsequent embodiment involving at least one cell.

[0043] In one embodiment, the at least one cell includes at least one of the following:

[0044] Master Cell Group (MCG);

[0045] Main cell (Pcell):

[0046] A primary cell (Pcell) and at least one secondary cell (Scell).

[0047] In one embodiment, the terminal can communicate in at least one cell under certain scenarios. For example, in a dual connectivity (DC) scenario, the terminal can communicate with network devices on both the primary cell group and the secondary cell group (SCG). In a carrier aggregation (CA) scenario, the terminal can communicate on the primary cell and at least one secondary cell. In a non-carrier aggregation scenario, the terminal can communicate on the primary cell.

[0048] A primary cell group can include a primary cell and at least one secondary cell; a secondary cell group can include a primary and secondary cell (PScell) and at least one secondary cell. Of course, the composition of primary and secondary cell groups is not limited to the above, and can be configured as needed.

[0049] When certain events occur, the terminal can determine that at least one cell change is required. The following are examples of several scenarios for such events:

[0050] For example, the terminal can determine that the first cell in the at least one cell needs the terminal to perform the at least one cell change upon receiving a switch command sent by the first cell. In this embodiment, the first cell can be one or more cells in the at least one cell in which the terminal is located before performing the at least one cell change. For example, the at least one cell before the change is the MCG, and the first cell can be the primary cell (Pcell) in the MCG or one or more secondary cells (Scell) in the MCG.

[0051] For example, the terminal can determine that the terminal itself needs to perform the at least one cell change, such as triggered by a user of the terminal, upon determining that the condition for triggering the at least one cell change is met, so as to determine that the at least one cell change needs to be performed.

[0052] It should be understood that the event for causing the terminal to determine that the at least one cell change needs to be performed is not limited to the above-mentioned several events, and can be set as needed.

[0053] In one embodiment, the terminal can perform the at least one cell change upon determining that the at least one cell change needs to be performed.

[0054] For example, when the at least one cell includes the MCG, performing the at least one cell change can change the MCG, such as changing all cells (primary cell and secondary cell) in the MCG or changing part of the cells in the MCG.

[0055] For example, when the at least one cell includes the primary cell, performing the at least one cell change can change the primary cell.

[0056] For example, when the at least one cell includes the primary cell and at least one secondary cell, performing the at least one cell change can change the primary cell and the at least one secondary cell.

[0057] In some cases, the terminal performs the at least one cell change, and at least one cell change failure occurs. The case of the at least one cell change failure will be described in subsequent embodiments, which will not be expanded here.

[0058] According to this embodiment, the terminal can perform connection recovery to restore the connection with the cell upon determining the at least one cell change failure, so as to ensure that the terminal can continue to maintain communication without causing communication interruption due to the at least one cell change failure and the cell without connection.

[0059] Figure 2 is a schematic flowchart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 2 The determination of the at least one cell change failure includes:

[0060] In step S201, it is determined that the at least one cell change fails when a timer associated with the at least one cell change expires.

[0061] In an embodiment, the terminal can be configured with a timer associated with the at least one cell change, and the terminal can determine that the at least one cell change fails when the timer expires. The expiration time of the timer can be configured by the network device or determined according to a protocol agreement. When the timer starts counting, if the counting time is greater than or equal to the expiration time, it can be determined that the timer expires.

[0062] It should be noted that the expiration time of the timer is essentially a preset time period, so the implementation manner of the embodiment can be described as follows: from determining that the at least one cell change is needed, if the at least one cell change is not determined to be successful within a first preset time period, it is determined that the at least one cell change fails.

[0063] In an embodiment, the event triggering the timer to start counting includes at least one of the following:

[0064] Receiving a change command sent by a first cell in the at least one cell, for example, in the case where the at least one cell includes an MCG, the change command can be a master cell group change command (MCG switch command);

[0065] Sending feedback of the change command to the first cell;

[0066] Determining that a condition triggering the at least one cell change is met;

[0067] Releasing a master cell in the at least one cell.

[0068] It should be noted that the first cell does not specifically refer to a certain cell, but refers to any cell in the at least one cell in which the terminal is located before the at least one cell change.

[0069] In an embodiment, as for receiving the change command sent by the first cell in the at least one cell, determining that the condition triggering the at least one cell change is met, these two cases have been described in the foregoing embodiments, and will not be described here. The following two cases will be mainly described: sending feedback of the change command to the first cell; and releasing a master cell in the at least one cell.

[0070] For example, after receiving the change command sent by the first cell in the at least one cell, the terminal sends feedback of the change command to the first cell, and it is determined that the terminal agrees to the change command, and then at least one cell change needs to be performed. The feedback can be sent in the form of a hybrid automatic repeat request (HARQ) or in the form of a media access control control element (MAC CE), which can be set as needed.

[0071] For example, when the terminal releases the primary cell in the at least one cell (including but not limited to releasing the MAC layer parameters of the primary cell), it is determined that at least one cell change needs to be performed. Since the terminal communicates on the at least one cell, it mainly communicates on the primary cell in the at least one cell. When the terminal releases the primary cell, it will not communicate on the primary cell, so it is determined that at least one cell change needs to be performed.

[0072] In one embodiment, the terminal starts the timer when determining the event that triggers the timer to start timing.

[0073] In one embodiment, in the case of at least one cell change being a random access-based change, the event that triggers the timer to end timing includes:

[0074] Successful random access initiated to the target cell.

[0075] In one embodiment, the target cell can be one or more cells in the at least one cell that the terminal needs to change to.

[0076] For example, when the at least one cell includes an MCG, the target cell can be the MCG that needs to be changed, such as the primary cell and the secondary cell in the MCG, or the target cell can be the primary cell in the MCG that needs to be changed, or the target cell can be the secondary cell in the MCG that needs to be changed.

[0077] For example, when the at least one cell includes a primary cell, the target cell can be the primary cell that needs to be changed.

[0078] For example, when the at least one cell includes a primary cell and at least one secondary cell, the target cell can be the primary cell and the secondary cell in the primary cell and the at least one secondary cell that needs to be changed, or the target cell can be the primary cell in the primary cell and the at least one secondary cell that needs to be changed, or the target cell can be the secondary cell in the primary cell and the at least one secondary cell that needs to be changed.

[0079] In one embodiment, in case that the at least one cell change is a random access based change, the terminal can perform the at least one cell change based on random access, e.g., initiate random access to the target cell. Wherein, in case that the random access is a 4-step random access, the terminal can determine that the random access is successful upon receiving a 4th message Msg4 of the 4-step random access; in case that the random access is a 2-step random access, the terminal can determine that the random access is successful upon receiving a 2nd message Msg4 of the 2-step random access.

[0080] In case that the terminal determines that the random access initiated to the target cell is successful before the timer expires, the terminal can end the counting of the timer. Upon next time determining that the at least one cell change is needed (e.g., upon next time an event occurs that causes the terminal to determine that the at least one cell change is needed, the specific event can refer to the previous embodiments, which will not be repeated here), the terminal can restart the timer, and the timer starts counting again. In case that the terminal fails to determine that the random access initiated to the target cell is successful before the timer expires, the terminal can determine that the at least one cell change fails upon expiration of the timer.

[0081] It should be noted that in the present embodiment, the source cell before the at least one cell change and the target cell after the at least one cell change can be cells or cell groups under the same base station, or can be cells or cell groups under different base stations.

[0082] In one embodiment, in case that the at least one cell change is a non-random access based change, the event that triggers the timer to end counting includes at least one of the following:

[0083] Receiving a downlink transmission sent by the target cell;

[0084] Receiving a downlink control information sent by the target cell for scheduling new transmission;

[0085] Receiving feedback information indicating that the access is successful, e.g., the feedback information can be sent in an explicit manner or in an implicit manner, and the following embodiments mainly exemplarily describe the explicit manner.

[0086] Wherein, the target cell is the at least one cell to which the terminal needs to change.

[0087] In one embodiment, in case that the at least one cell change is a non-random access based change, the at least one cell change performed by the terminal can not be based on random access, e.g., the terminal can send notification information (e.g., MAC CE) to the target cell to notify the target cell that the terminal wants to change to the target cell.

[0088] So the terminal can determine that the at least one cell change is successful in some events. The following exemplary describes several cases of the events:

[0089] For example, the terminal receives the downlink transmission sent by the target cell. Specifically, the terminal receives the downlink transmission sent by the target cell within a second preset time range from the terminal sending the notification information to the target cell. Since the terminal successfully changes to the target cell, the target cell will send the downlink transmission to the terminal, so the terminal can determine that the at least one cell change is successful when receiving the downlink transmission sent by the target cell. The downlink transmission includes but is not limited to a physical downlink control channel (PDCCH), for example, a PDCCH scrambled by a cell radio network temporary identifier (C-RNTI) of the terminal.

[0090] For example, the terminal receives the downlink control information (DCI) sent by the target cell for scheduling new transmission (which can be new uplink transmission or new downlink transmission). Specifically, the terminal receives the DCI sent by the target cell for scheduling new transmission within a third preset time range from the terminal sending the notification information to the target cell. Since the terminal successfully changes to the target cell, the target cell will send the DCI for scheduling new transmission to the terminal, so the terminal can determine that the at least one cell change is successful when receiving the DCI for scheduling new transmission sent by the target cell. The DCI for scheduling new transmission can be DCI scrambled by a C-RNTI of the terminal.

[0091] For example, the terminal receives feedback information indicating that the access is successful. The feedback information can be feedback for the notification information, specifically, the terminal receives the feedback information sent by the target cell within a fourth preset time range from the terminal sending the notification information to the target cell. Since the terminal successfully changes to the target cell, the target cell will send the feedback information to the terminal to notify the terminal that the access is successful, so the terminal can determine that the at least one cell change is successful when receiving the feedback information indicating that the access is successful.

[0092] It should be understood that the events that make the terminal determine that the at least one cell change is successful are not limited to the above several, and can be set as needed.

[0093] In one embodiment, the event triggering the timer associated with the at least one cell change to end counting can be the same as the event causing the terminal to determine that the at least one cell change is successful. Then the terminal can control the timer to end counting when it determines that the at least one cell change is successful, so that the timer will not time out and the terminal will not determine that the at least one cell change fails.

[0094] In one embodiment, the feedback information comprises at least one of the following:

[0095] Radio Resource Control (RRC) layer signaling;

[0096] Medium Access Control (MAC) layer signaling, such as MAC CE;

[0097] Physical layer signaling, such as DCI.

[0098] Taking the feedback information as MAC CE as an example. In order to distinguish from the MAC CE in the related art, in one embodiment, a new MAC CE can be defined as the feedback information; in another embodiment, a contention resolution MAC CE can be reused, but all the values in the MAC CE need to be set to a predefined value (such as 0 or 1).

[0099] As to Figure 2 The embodiments shown can be implemented independently or on the basis of any of the preceding embodiments. For example, on the basis of the embodiments shown, the following steps can be implemented: Figure 1

[0100] When the timer associated with the at least one cell change times out, determining that the at least one cell change fails;

[0101] Performing connection recovery.

[0102] The related embodiments can be referred to the foregoing description, and the related embodiments can be implemented independently or combined as needed according to the following embodiments, and the present disclosure is not limited.

[0103] In the case of timer timeout, the terminal can determine that the at least one cell change fails, and thus can perform connection recovery. The following will exemplarily illustrate the way of performing connection recovery through several embodiments.

[0104] Figure 3 is a schematic flow chart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 3 The performing connection recovery comprises:

[0105] In step S301, in the case of existence of the secondary cell group, at least one cell change failure information is sent to the secondary cell group;​

[0106] In step S302, connection recovery is performed under the control of the secondary cell group.

[0107] In one embodiment, when the secondary cell group exists (the terminal is configured with the secondary cell group, and the secondary cell group is in an available state), if the network device configures the terminal such that the terminal can send at least one cell change failure message to the secondary cell group, or the protocol stipulates that the terminal can send at least one cell change failure message to the secondary cell group, the terminal can send at least one cell change failure message to the secondary cell group, and then connection recovery can be performed under the control of the secondary cell group.

[0108] The process in which the secondary cell group controls the terminal to perform connection recovery is specific to the implementation of the secondary cell group, and the disclosure is not limited. For example, the secondary cell group can control the terminal to access at least one cell of the secondary cell group to recover the connection, and the secondary cell group can specify a cell group for the terminal as at least one cell to access to recover the connection.

[0109] In one embodiment, the connection recovery further includes:

[0110] In the absence of the secondary cell group, cell selection is performed, and radio resource control reestablishment is performed on the selected cell to recover the connection.

[0111] In one embodiment, in the absence of the secondary cell group, for example, the network device does not configure the terminal with the secondary cell group, or the terminal is configured with the secondary cell group, but the secondary cell group is in an unavailable state, the terminal can perform cell selection, and then performs radio resource control reestablishment on the selected cell to recover the connection.

[0112] It should be noted that the radio resource control reestablishment in this embodiment can be different from the radio resource control reestablishment in the related art.

[0113] In one embodiment, the radio resource control reestablishment on the selected cell to recover the connection includes:

[0114] In the case where the selected cell is a candidate cell pre-configured with radio resource control parameters, connection recovery is performed on the candidate cell according to the radio resource control parameters.

[0115] In one embodiment, the candidate cell can be selected by the network device for the terminal according to the measurement result of the terminal through L3 measurement and reporting of the measurement result before the terminal performs at least one cell change, and the network device configures the terminal with the radio resource control parameters of the candidate cell.

[0116] In a case where the terminal selects a candidate cell in cell selection, the terminal can perform connection recovery on the candidate cell according to a pre-configured radio resource control parameter of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameter of the candidate cell has been configured to the terminal by the network device before the terminal performs at least one cell selection, in the embodiment, the network device only needs to configure a radio resource control parameter other than the pre-configured radio resource control parameter to the terminal.

[0117] In one embodiment, the radio resource control reestablishment on the selected cell to recover the connection comprises:

[0118] Based on the indication of the network device, performing the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell.

[0119] In one embodiment, the network device can indicate the terminal to perform the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell. Since the radio resource control parameter of the source cell has been configured to the terminal by the network device before the terminal performs at least one cell selection, in the embodiment, the network device only needs to configure a radio resource control parameter other than the pre-configured radio resource control parameter to the terminal. Accordingly, it is beneficial to simplify the process of configuring the radio resource control parameter to the terminal by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0120] With regard to Figure 3 The embodiments shown can be independently implemented, or implemented on the basis of any of the preceding embodiments. For example, on the basis of the embodiments shown, the following steps can be implemented: Figure 1 The embodiments shown can be independently implemented, or implemented on the basis of any of the preceding embodiments. For example, on the basis of the embodiments shown, the following steps can be implemented:

[0121] Determine at least one cell change failure;

[0122] In a case where the secondary cell group exists, send at least one cell change failure information to the secondary cell group;

[0123] Perform connection recovery according to the control of the secondary cell group.

[0124] The related embodiments can refer to the foregoing description, and the related embodiments can be independently implemented or combined as needed. The present disclosure is not limited.

[0125] Figure 4 is a schematic flowchart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 4 The performing connection recovery comprises:

[0126] In step S401, connection recovery is performed through the source cell. In step S401, connection recovery is performed through the source cell.

[0127] In an embodiment, the source cell can be one or more cells in at least one cell in which the terminal is located before performing the at least one cell change.

[0128] For example, when the at least one cell comprises a MCG, the source cell can be the MCG in which the terminal is located before performing the at least one cell change, for example, a primary cell and a secondary cell in the MCG, or the source cell can be the primary cell in the MCG in which the terminal is located before performing the at least one cell change, or the source cell can be the secondary cell in the MCG in which the terminal is located before performing the at least one cell change.

[0129] For example, when the at least one cell comprises a primary cell, the source cell can be the primary cell in which the terminal is located before performing the at least one cell change.

[0130] For example, when the at least one cell comprises a primary cell and at least one secondary cell, the source cell can be the primary cell and the secondary cell in the primary cell and the at least one secondary cell in which the terminal is located before performing the at least one cell change, or the source cell can be the primary cell in the primary cell and the at least one secondary cell in which the terminal is located before performing the at least one cell change, or the source cell can be the secondary cell in the primary cell and the at least one secondary cell in which the terminal is located before performing the at least one cell change.

[0131] When the terminal determines that the at least one cell change fails, the terminal can not perform cell selection and directly perform connection recovery through the source cell, for example, continue to communicate on the source cell. After the terminal successfully performs the at least one cell change, for example, changes to a target cell, the target cell can send feedback to the source cell to inform the source cell that the terminal has successfully changed to the target cell. Before receiving the feedback from the target cell, the source cell can maintain the connection with the terminal, so that the terminal can directly perform connection recovery through the source cell in the case that the at least one cell change fails; only after receiving the feedback from the target cell, the source cell releases the connection with the terminal.

[0132] Since the source cell can maintain the connection with the terminal for the terminal to perform connection recovery through the source cell, there is no need to perform radio resource control reestablishment in this process, which facilitates the terminal to quickly perform connection recovery.

[0133] In an embodiment, the performing connection recovery through the source cell comprises:

[0134] sending at least one cell change failure information to the source cell;

[0135] accessing the source cell.

[0136] In one embodiment, the terminal performs connection recovery through the source cell, and can first send at least one cell change failure message to the source cell to inform the source cell that at least one cell change failure occurs in the terminal, so that the source cell can learn that the terminal needs to access the source cell, and then the terminal accesses the source cell and can successfully communicate with the source cell, without the need of radio resource control reestablishment in the process.

[0137] In one embodiment, the performing connection recovery further includes:

[0138] In the case of failure in accessing the source cell, performing cell selection and performing radio resource control reestablishment through the selected cell to recover the connection.

[0139] In one embodiment, the terminal performs connection recovery through the source cell, and needs to access the source cell. For example, at least one cell change failure message is first sent to the source cell, and when downlink transmission of a first cell in the at least one cell is received, it can be determined that the access to the source cell is successful. If the downlink transmission of the first cell in the at least one cell is not received, for example, the downlink transmission of the first cell in the at least one cell is not received within a fourth preset time range from the time when the at least one cell change failure message is sent to the source cell, it can be determined that the access to the source cell fails, and then the terminal can perform cell selection and perform radio resource control reestablishment through the selected cell to recover the connection.

[0140] It should be noted that the radio resource control reestablishment in the embodiment can be different from the radio resource control reestablishment in the related art.

[0141] In one embodiment, the performing radio resource control reestablishment through the selected cell to recover the connection includes:

[0142] In the case of the selected cell being a candidate cell pre-configured with radio resource control parameters, performing connection recovery on the candidate cell according to the radio resource control parameters.

[0143] In one embodiment, the candidate cell can be selected by a network device for the terminal according to measurement results measured and reported by the terminal through L3 before the terminal performs at least one cell change, and the network device configures radio resource control parameters of the candidate cell for the terminal.

[0144] In a case where the terminal selects a candidate cell in cell selection, the terminal can perform connection recovery on the candidate cell according to a pre-configured radio resource control parameter of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameter of the candidate cell is configured to the terminal by the network device before the terminal performs at least one cell selection, in the embodiment, the network device only needs to configure the radio resource control parameter other than the pre-configured radio resource control parameter to the terminal.

[0145] In one embodiment, the radio resource control reestablishment on the selected cell to recover the connection comprises:

[0146] Based on the indication of the network device, performing the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell.

[0147] In one embodiment, the network device can indicate the terminal to perform the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell. Since the radio resource control parameter of the source cell is configured to the terminal by the network device before the terminal performs at least one cell selection, in the embodiment, the network device only needs to configure the radio resource control parameter other than the pre-configured radio resource control parameter to the terminal. Accordingly, it is beneficial to simplify the process of configuring the radio resource control parameter to the terminal by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0148] With regard to Figure 4 The embodiments shown can be independently implemented, or implemented on the basis of any of the preceding embodiments. For example, on the basis of the embodiments shown, the following steps can be implemented: Figure 1 The embodiments shown can be independently implemented, or implemented on the basis of any of the preceding embodiments. For example, on the basis of the embodiments shown, the following steps can be implemented:

[0149] Determine at least one cell change failure;

[0150] Perform connection recovery through the source cell.

[0151] The related embodiments can refer to the foregoing description, and the related embodiments can be independently implemented or combined as needed. The present disclosure is not limited.

[0152] Figure 5 is a schematic flowchart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 5 The method further comprises:

[0153] In step S501, a plurality of cells determined in advance are evaluated;

[0154] In step S502, a cell satisfying an evaluation condition is determined;

[0155] In step S503, connection recovery is performed on the selected cell.Figure 1 In step S102 of the illustrated embodiment, or in the connection resumption of any of the preceding embodiments, comprises:

[0156] In step S503, the connection is resumed through the cell that meets the evaluation condition.

[0157] In one embodiment, before the at least one cell change, the terminal can determine a plurality of cells in advance, for example, the plurality of cells can be determined according to the protocol, and the plurality of cells can also be determined according to the cell list configured by the network device. The terminal can evaluate the plurality of cells and determine the cells that meet the evaluation condition, and then when the at least one cell change fails, the connection resumption can be performed through the cell that meets the evaluation condition (for example, through the radio resource control reestablishment), without having to perform the cell selection operation again, thereby facilitating the rapid completion of the connection resumption.

[0158] Wherein, the evaluation method of the plurality of cells can be set as needed, and the present disclosure is not limited. For example, for each cell in the plurality of cells, the channel condition of the cell can be characterized by the average beam quality Q of the cell (for example, the average value of the plurality of measurements of the beam quality of the cell).

[0159] For example, the evaluation condition is that Q is greater than a threshold T1, if the Q corresponding to the cell is greater than the threshold T1, the cell can be determined as a cell that meets the evaluation condition, and added to the candidate cell set, and the terminal can select a cell from the candidate cell set for connection resumption. For the cells in the candidate cell set, the evaluation can continue, and when the Q of a certain evaluation is not greater than the threshold T1, the cell can be removed from the candidate cell set.

[0160] For example, the evaluation condition is that the Q measured continuously N times is greater than the threshold T1, whether the cell meets the evaluation condition can be determined according to the continuous evaluation results of the cell, for example, for the Q of the continuous evaluation of the cell, if all the Qs are greater than T1, the cell can be determined as a cell that meets the evaluation condition, and added to the candidate cell set, and the terminal can select a cell from the candidate cell set for connection resumption. For the cells in the candidate cell set, the evaluation can continue, and when the Q of the continuous evaluation is less than a threshold T2 (which can be equal to T1, or a value less than T1, or a value greater than T1), the cell can be removed from the candidate cell set.

[0161] In one embodiment, when there are a plurality of cells that meet the evaluation condition, the terminal can select one cell for connection resumption, or can determine one cell for connection resumption according to a predefined rule, for example, select the cell that meets the evaluation result of the last evaluation for connection resumption.

[0162] In one embodiment, if the network device has previously informed the terminal of the timing advance (TA) of the cell satisfying the evaluation condition through timing advance management (TA management), it can be considered that the terminal has completed uplink synchronization on the cell, and the terminal can send information to the cell without random access, for example, sending a message using a reserved resource (which can be pre-configured), thereby facilitating quick completion of connection recovery. For the cell satisfying the evaluation condition without pre-informed TA, the terminal needs to perform random access for connection recovery on the cell.

[0163] In one embodiment, the predetermined plurality of cells includes at least one of the following:

[0164] A source cell;

[0165] A candidate cell pre-configured with a radio resource control parameter.

[0166] In one embodiment, when the source cell satisfies the evaluation condition, since the radio resource control parameter of the source cell is known to the terminal, the network device can not need to re-configure the radio resource control parameter of the source cell for the terminal when the terminal performs connection recovery through the source cell, thereby facilitating simplification of the process of configuring the radio resource control parameter for the terminal by the network device in the connection recovery process, and further facilitating quick completion of connection recovery.

[0167] In one embodiment, when the candidate cell satisfies the evaluation condition, the terminal performs connection recovery through the candidate cell. The candidate cell can be selected by the network device for the terminal according to the measurement result of the terminal through L3 measurement and reporting of the measurement result before the terminal performs at least one cell change, and the network device configures the radio resource control parameter (such as a physical downlink control channel resource) of the candidate cell for the terminal.

[0168] Since the terminal performs at least one cell change, the reason is generally that the service quality of the source cell is relatively poor, and after the at least one cell change fails, the source cell is not necessarily a suitable cell when the terminal performs connection recovery through the source cell. If connection recovery is performed through radio resource control re-establishment after the at least one cell change fails, since cell selection is required, it takes a long time, which can result in a long connection interruption time.

[0169] According to the embodiment, the wireless resource control parameters of the candidate cell are configured to the terminal by the network device before the terminal performs at least one cell selection, and thus the network device only needs to configure the wireless resource control parameters other than the pre-configured wireless resource control parameters to the terminal for the candidate cell. Accordingly, compared with the connection recovery through the source cell, the connection recovery through a more suitable cell is facilitated, and compared with the connection recovery through the wireless resource control reestablishment, the process of configuring the wireless resource control parameters to the terminal by the network device during the connection recovery is simplified, so as to complete the connection recovery as soon as possible.

[0170] In one embodiment, the performing the connection recovery further includes:

[0171] In the case where there is no cell satisfying the evaluation condition, performing cell selection, and performing wireless resource control reestablishment through the selected cell to recover the connection.

[0172] In one embodiment, the terminal evaluates a plurality of cells, and in the case where there is no cell satisfying the evaluation condition, the terminal can perform cell selection and perform wireless resource control reestablishment through the selected cell to recover the connection.

[0173] It should be noted that the wireless resource control reestablishment in the embodiment can be different from the wireless resource control reestablishment in the related art.

[0174] In one embodiment, the performing the connection recovery further includes:

[0175] In the case where the selected cell is a candidate cell pre-configured with wireless resource control parameters, performing the connection recovery on the candidate cell according to the wireless resource control parameters.

[0176] In one embodiment, the candidate cell can be a cell selected by the network device for the terminal according to measurement results reported by the terminal through L3 measurement before the terminal performs at least one cell change, and the network device configures the wireless resource control parameters of the candidate cell to the terminal.

[0177] In the case where the terminal selects the candidate cell during cell selection, the terminal can perform the connection recovery on the candidate cell according to the pre-configured wireless resource control parameters of the candidate cell. Compared with the wireless resource control reestablishment in the related art, the wireless resource control parameters of the candidate cell are configured to the terminal by the network device before the terminal performs at least one cell selection, and thus the network device only needs to configure the wireless resource control parameters other than the pre-configured wireless resource control parameters to the terminal.

[0178] In one embodiment, the wireless resource control reestablishment through the selected cell to recover the connection comprises:

[0179] Based on the indication of the network device, the connection recovery is performed on the selected cell according to the wireless resource control parameters configured to the source cell.

[0180] In one embodiment, the network device can instruct the terminal to perform the connection recovery on the selected cell according to the wireless resource control parameters configured to the source cell. Since the wireless resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the wireless resource control parameters other than the pre-configured wireless resource control parameters to the terminal in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the wireless resource control parameters to the terminal by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0181] As to Figure 5 The embodiments shown can be independently implemented, or implemented on the basis of any of the foregoing embodiments. For example, on the basis of the embodiments shown in Figure 1 The embodiments shown can be independently implemented, or implemented on the basis of any of the foregoing embodiments. For example, on the basis of the embodiments shown in

[0182] The plurality of cells are evaluated;

[0183] The cell satisfying the evaluation condition is determined;

[0184] At least one cell change failure is determined;

[0185] The connection recovery is performed through the cell satisfying the evaluation condition.

[0186] The related embodiments can be referred to the foregoing description, and the related embodiments can be independently implemented or combined as needed, and the present disclosure is not limited.

[0187] Figure 6 is a schematic flow chart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 6 The connection recovery comprises:

[0188] In step S601, the cell indicated by the network device for connection recovery is determined;

[0189] In step S602, the connection recovery is performed through the cell for connection recovery.

[0190] In one embodiment, the network device can indicate the cell for connection recovery to the terminal, and then the terminal does not need to perform cell selection when performing connection recovery after at least one cell change failure, and directly performs connection recovery through the cell for connection recovery indicated by the network device. For example, the network device can indicate the cell for connection recovery in the command for at least one cell change sent to the terminal.

[0191] In one embodiment, the performing connection recovery further includes:

[0192] When the connection recovery through the cell for connection recovery fails, performing cell selection and performing radio resource control reestablishment through the selected cell to recover the connection.

[0193] In one embodiment, the terminal performs connection recovery through the cell for connection recovery indicated by the network device, and needs to access the source cell. For example, at least one cell change failure information is sent to the cell for connection recovery, and when the downlink transmission of the cell for connection recovery is received, it can be determined that the access to the cell for connection recovery is successful. If the downlink transmission of the cell for connection recovery is not received, for example, the downlink transmission of the cell for connection recovery is not received within a fifth preset time range from the time when the at least one cell change failure information is sent to the cell for connection recovery, it can be determined that the access to the cell for connection recovery fails, and then the terminal can perform cell selection and perform radio resource control reestablishment through the selected cell to recover the connection.

[0194] It should be noted that the radio resource control reestablishment in the embodiment can be different from the radio resource control reestablishment in the related art.

[0195] In one embodiment, the performing radio resource control reestablishment through the selected cell to recover the connection includes:

[0196] In the case that the selected cell is a candidate cell pre-configured with radio resource control parameters, the connection recovery is performed on the candidate cell according to the radio resource control parameters.

[0197] In one embodiment, the candidate cell can be a cell selected by the network device for the terminal according to the measurement result of the terminal performing measurement and reporting the measurement result through L3 before the terminal performs at least one cell change, and the network device configures the radio resource control parameters of the candidate cell for the terminal.

[0198] In the case that the terminal selects a candidate cell in the cell selection, the terminal can perform connection recovery on the candidate cell according to the pre-configured radio resource control parameter of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameter of the candidate cell has been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the radio resource control parameter other than the pre-configured radio resource control parameter to the terminal in the embodiment.

[0199] In one embodiment, the radio resource control reestablishment on the selected cell to recover the connection comprises:

[0200] Based on the indication of the network device, performing the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell.

[0201] In one embodiment, the network device can indicate the terminal to perform the connection recovery on the selected cell according to the radio resource control parameter configured to the source cell. Since the radio resource control parameter of the source cell has been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the radio resource control parameter other than the pre-configured radio resource control parameter to the terminal in the embodiment. Accordingly, it is beneficial to simplify the process of configuring the radio resource control parameter to the terminal by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0202] With regard to Figure 6 The embodiment shown in FIG. 8 can be independently implemented, or can be implemented on the basis of any one of the foregoing embodiments. For example, the embodiment shown in FIG. 8 can be implemented on the basis of the embodiment shown in FIG. 7. Figure 1 The embodiment shown in FIG. 8 can be implemented according to the following steps:

[0203] Determine that at least one cell change fails;

[0204] Determine the cell for connection recovery indicated by the network device;

[0205] Perform the connection recovery through the cell for connection recovery.

[0206] The related embodiments can refer to the foregoing description, and the related embodiments can be independently implemented or combined as needed. The present disclosure is not limited.

[0207] Figure 7 FIG. 9 is a schematic flowchart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in FIG. 9, the method comprises the following steps. Figure 7 The performing the connection recovery comprises:

[0208] In step S701, perform cell selection, and perform radio resource control reestablishment on the selected cell to recover the connection.

[0209] In one embodiment, after at least one cell change failure, the terminal can perform cell selection when performing connection recovery, and perform radio resource control reestablishment through the selected cell to recover the connection.

[0210] It should be noted that the radio resource control reestablishment in the embodiments of the present disclosure is different from the radio resource control reestablishment in the related art, which will be described below through several embodiments.

[0211] In one embodiment, the radio resource control reestablishment through the selected cell to recover the connection includes:

[0212] In the case where the selected cell is a candidate cell pre-configured with radio resource control parameters, the connection recovery is performed on the candidate cell according to the radio resource control parameters.

[0213] In one embodiment, the candidate cell can be selected by the network device for the terminal according to the measurement results of the terminal performing measurement and reporting measurement results through L3 before at least one cell change, and the network device configures the radio resource control parameters of the candidate cell for the terminal.

[0214] In the case where the terminal selects the candidate cell when performing cell selection, the terminal can perform connection recovery on the candidate cell according to the pre-configured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameters of the candidate cell have been configured for the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the radio resource control parameters other than the pre-configured radio resource control parameters for the terminal in the embodiment. Accordingly, it is beneficial to simplify the process of the network device configuring the radio resource control parameters for the terminal in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0215] The number n of attempts of the terminal to perform connection recovery through the candidate cell can be limited, for example, the number of attempts can be determined based on a protocol agreement, or can be indicated by the network device. In the case where the terminal fails to perform connection recovery through the candidate cell, the terminal can fail to perform connection recovery through the candidate cell again until the number of attempts n is reached, and then can perform connection recovery through other ways, so as to avoid too many attempts and slow connection recovery and waste resources.

[0216] In one embodiment, the radio resource control reestablishment through the selected cell to recover the connection includes:

[0217] Based on the indication of the network device, the connection recovery is performed on the selected cell according to the radio resource control parameters configured for the source cell.

[0218] In one embodiment, the network device can instruct the terminal to perform connection recovery on the selected cell according to the radio resource control parameters configured to the source cell. Since the radio resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the pre-configured radio resource control parameters in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with radio resource control parameters by the network device in the connection recovery process, and further to complete the connection recovery as soon as possible.

[0219] As to Figure 7 The embodiments shown in the above can be implemented independently or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented: Figure 1

[0220] determining at least one cell change failure;

[0221] performing cell selection and performing radio resource control reestablishment through the selected cell to recover the connection.

[0222] The related embodiments can be referred to the above description, and the related embodiments can be implemented independently or combined as needed according to the following description, and the present disclosure is not limited.

[0223] Figure 8 is a schematic flow chart of a cell change failure processing method according to an embodiment of the present disclosure. The change failure processing method shown in this embodiment can be performed by a network device, which can communicate with a terminal, and the network device includes but is not limited to a base station in a communication system such as a 4G base station, a 5G base station, a 6G base station, etc., and the terminal includes but is not limited to a communication device such as a mobile phone, a tablet computer, a wearable device, a sensor, an Internet of Things device, etc.

[0224] As shown in the above, the change failure processing method can include the following steps: Figure 8

[0225] In step S801, connection recovery is performed with the terminal in the case of at least one cell change failure of the terminal.

[0226] It should be noted that in one embodiment, at least one cell change (Switch) is different from the cell handover (handover) in the related art.

[0227] ​​The measurement operation on the cell in the cell switching process in the related art is performed at L3 (Layer 3), and needs to perform cell selection / reselection, and the like, and the process of the cell switching needs to be implemented based on RRC signaling. At least one cell change in the embodiments of the present disclosure is performed at L1 (Layer 1), and the measurement operation on the at least one cell can not be performed, and the cell selection / reselection, and the like, can not be performed, and can not be implemented based on RRC signaling.

[0228] In one embodiment, the at least one cell can be regarded as a cell set, and the cell set includes one or more cells. In the case where the cell set includes multiple cells, each of the multiple cells can belong to the same type, or at least two of the multiple cells can belong to different types. The embodiment can be applicable to any subsequent embodiment involving the at least one cell.

[0229] In one embodiment, the at least one cell includes at least one of the following:

[0230] A master cell group (MCG);

[0231] A primary cell (Pcell);

[0232] A primary cell (Pcell) and at least one secondary cell (Scell).

[0233] In one embodiment, the terminal can communicate in the at least one cell in some scenarios, for example, in a dual connectivity (DC) scenario, the terminal can communicate with the network device on the at least one cell and a secondary cell group (SCG). In a carrier aggregation (CA) scenario, the terminal can communicate on a primary cell and at least one secondary cell. In a non-carrier aggregation scenario, the terminal can communicate on a primary cell.

[0234] The master cell group can include a primary cell and at least one secondary cell, and the secondary cell group can include a primary secondary cell (PScell) and at least one secondary cell. Of course, the constitution of the master cell group and the secondary cell group is not limited to the above, and can be set as needed.

[0235] When certain events occur, the terminal can determine that at least one cell change is needed. The following describes several cases of the events in an exemplary manner:

[0236] For example, the terminal can determine that the terminal needs to perform the at least one cell change when the terminal receives a switch command sent by a first cell in the at least one cell. In this embodiment, the first cell can be one or more cells in the at least one cell in which the terminal is located before the at least one cell change. For example, the at least one cell before the change is the MCG, and the first cell can be the primary cell (Pcell) in the MCG or one or more secondary cells (Scell) in the MCG.

[0237] For example, the terminal can determine that the terminal agrees to perform the at least one cell change when the terminal sends feedback of the switch command to the first cell after receiving the switch command sent by the first cell in the at least one cell. Then, the terminal needs to perform the at least one cell change. The feedback can be sent in the form of a hybrid automatic repeat request (HARQ) or in the form of a medium access control (MAC) control element (CE), which can be set as needed.

[0238] For example, the terminal can determine that the terminal itself needs to perform the at least one cell change when the terminal determines that the condition for triggering the at least one cell change is met, for example, triggered by a user of the terminal. Thus, the terminal needs to perform the at least one cell change.

[0239] For example, the terminal can determine that the terminal needs to perform the at least one cell change when the terminal releases a primary cell in the at least one cell (including but not limited to releasing MAC layer parameters of the primary cell). Since the terminal communicates on the at least one cell, it mainly communicates on the primary cell in the at least one cell. When the terminal releases the primary cell, it will not communicate on the primary cell, so it can be determined that the terminal needs to perform the at least one cell change.

[0240] It should be understood that the events that cause the terminal to determine that the terminal needs to perform the at least one cell change are not limited to the above-mentioned events, and can be set as needed.

[0241] In one embodiment, the terminal can perform the at least one cell change when the terminal determines that the terminal needs to perform the at least one cell change.

[0242] For example, when the at least one cell includes an MCG, performing the at least one cell change can change the MCG, for example, changing all cells (primary cell and secondary cell) in the MCG or changing part of the cells in the MCG.

[0243] For example, when the at least one cell includes a primary cell, performing the at least one cell change can change the primary cell.

[0244] For example, when at least one cell includes a primary cell and at least one secondary cell, at least one cell change is performed, and the primary cell and the at least one secondary cell can be changed.

[0245] In some cases, the terminal performs at least one cell change, and at least one cell change failure occurs. The manner of judging at least one cell change failure can be implemented by a timer, and the related implementation manner has been described in the foregoing terminal-side embodiment, which will not be described here.

[0246] According to the embodiment, when the network device determines that the terminal has at least one cell change failure, the network device can perform connection recovery with the terminal, for example, restore the connection between the terminal and the cell, so as to ensure that the terminal can continue to maintain communication and will not be caused by at least one cell change failure without a connected cell to cause communication interruption.

[0247] Figure 9 is another schematic flowchart of a cell change failure processing method according to an embodiment of the disclosure. As shown in Figure 9 The connection recovery with the terminal includes:

[0248] In step S901, when the terminal is configured with a secondary cell group, at least one cell change failure information sent by the terminal is received through the secondary cell group;

[0249] In step S902, the terminal is controlled to perform connection recovery through the secondary cell group.

[0250] In one embodiment, when the network device configures the terminal with a secondary cell group and the secondary cell group is in an available state, if the network device configures the terminal so that the terminal can send at least one cell change failure information to the secondary cell group, or the protocol stipulates that the terminal can send at least one cell change failure information to the secondary cell group, the terminal can send at least one cell change failure information to the secondary cell group, and then the base station can control the terminal to perform connection recovery through the secondary cell group after receiving at least one cell change failure information through the secondary cell group.

[0251] The process in which the network device controls the terminal to perform connection recovery through the secondary cell group is specifically based on the implementation of the network device, and the disclosure is not limited. For example, the network device can control the terminal to access the secondary cell group as at least one cell to restore the connection, for example, the network device can specify a cell group for the terminal as at least one cell to access to restore the connection through the secondary cell group.

[0252] In one embodiment, the connection recovery with the terminal further includes:

[0253] In a case where no secondary cell group is configured for the terminal or the configured secondary cell group is unavailable, the terminal performs radio resource control reestablishment through a cell selected by the terminal to resume the connection.

[0254] In one embodiment, in a case where no secondary cell group is configured for the terminal or the configured secondary cell group is unavailable, the terminal can perform cell selection, and the network device can perform radio resource control reestablishment with the terminal through the cell selected by the terminal to resume the connection.

[0255] It should be noted that the radio resource control reestablishment in this embodiment can be different from the radio resource control reestablishment in the related art.

[0256] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0257] In a case where the cell selected by the terminal is a candidate cell preconfigured with radio resource control parameters, the network device performs connection resumption with the terminal on the candidate cell according to the radio resource control parameters.

[0258] In one embodiment, the candidate cell can be selected by the network device for the terminal according to measurement results reported by the terminal through L3 before the terminal performs at least one cell change, and the network device configures the terminal with radio resource control parameters of the candidate cell.

[0259] In a case where the terminal performs cell selection and selects the candidate cell, the network device performs connection resumption with the terminal on the candidate cell according to the preconfigured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment in the related art, since the radio resource control parameters of the candidate cell are configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the preconfigured radio resource control parameters in this embodiment.

[0260] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0261] The terminal is instructed to perform connection resumption on the selected cell according to radio resource control parameters configured to a source cell;

[0262] The terminal is instructed to perform connection resumption on the selected cell according to radio resource control parameters configured to a source cell;

[0263] In one embodiment, the network device can instruct the terminal to perform connection recovery on the selected cell according to the radio resource control parameters configured to the source cell. Since the radio resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the pre-configured radio resource control parameters in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with radio resource control parameters by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0264] As to Figure 9 The embodiments shown in the above can be implemented independently or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented: Figure 8

[0265] In the case that the terminal fails to perform at least one cell change, and in the case that the terminal is configured with a secondary cell group, receiving at least one cell change failure information sent by the terminal through the secondary cell group;

[0266] Controlling the terminal to perform connection recovery through the secondary cell group.

[0267] The related embodiments can be referred to the above description, and the related embodiments can be implemented independently or combined as needed according to the following description, and the present disclosure is not limited.

[0268] Figure 10 is a schematic flow chart of another cell change failure processing method according to the embodiments of the present disclosure. As shown in Figure 10 The connection recovery with the terminal includes:

[0269] In step S1001, the connection between the source cell and the terminal is maintained, and the connection recovery with the terminal is performed through the source cell.

[0270] In one embodiment, the source cell can be one or more cells in at least one cell in which the terminal is located before performing at least one cell change.

[0271] For example, when the at least one cell includes a MCG, the source cell can be the MCG in which the terminal is located before performing at least one cell change, for example, the primary cell and the secondary cell in the MCG, or the source cell can be the primary cell in the MCG in which the terminal is located before performing at least one cell change, or the source cell can be the secondary cell in the MCG in which the terminal is located before performing at least one cell change.

[0272] For example, when the at least one cell includes a primary cell, the source cell can be the primary cell in which the terminal is located before performing at least one cell change.

[0273] ​For example, when the at least one cell includes a master cell and at least one secondary cell, the source cell can be a master cell and a secondary cell in the master cell and the at least one secondary cell in which the terminal is located before the at least one cell change is performed, or the source cell can be a master cell in the master cell and the at least one secondary cell in which the terminal is located before the at least one cell change is performed, or the source cell can be a secondary cell in the master cell and the at least one secondary cell in which the terminal is located before the at least one cell change is performed.

[0274] After the at least one cell change of the terminal is successful, for example, the change to the target cell, the target cell can send feedback to the source cell to inform the source cell that the terminal successfully changes to the target cell. The network device can maintain the connection between the source cell and the terminal before receiving the feedback of the target cell, so that the connection recovery between the terminal and the source cell can be directly performed in the case that the at least one cell change of the terminal fails; the network device releases the connection between the source cell and the terminal only after receiving the feedback of the target cell.

[0275] By maintaining the connection between the source cell and the terminal for the connection recovery of the terminal through the source cell, the radio resource control reestablishment is not required in the process, and the terminal can quickly perform the connection recovery.

[0276] In an embodiment, the connection recovery between the source cell and the terminal includes:

[0277] The at least one cell change failure information sent by the terminal is received through the source cell.

[0278] In an embodiment, the terminal performs the connection recovery through the source cell, can first send at least one cell change failure information to the source cell, and the network device can receive the at least one cell change failure information sent by the terminal through the source cell, thereby determining that the at least one cell change failure of the terminal occurs, the terminal needs to access the source cell, and then the terminal accesses the source cell, can successfully communicate with the source cell, and the radio resource control reestablishment is not required in the process.

[0279] In an embodiment, the connection recovery between the source cell and the terminal further includes:

[0280] In the case that the terminal fails to access the source cell, the radio resource control reestablishment is performed through the cell selected by the terminal to recover the connection.

[0281] In an embodiment, the terminal needs to access the source cell for connection recovery through the source cell. For example, at least one cell change failure message is sent to the source cell, and when downlink transmission of a first cell in the at least one cell is received, it can be determined that the access to the source cell is successful. If the downlink transmission of the first cell in the at least one cell is not received, for example, the downlink transmission of the first cell in the at least one cell is not received within a fourth preset time range from sending the at least one cell change failure message to the source cell, it can be determined that the access to the source cell fails, and then the terminal can perform cell selection, and the network device can perform radio resource control reestablishment with the terminal through the cell selected by the terminal to recover the connection.

[0282] It should be noted that the first cell is not specifically a certain cell, but refers to any one of the at least one cell in which the terminal is located before performing at least one cell change.

[0283] It should be noted that the radio resource control reestablishment in the embodiment can be different from the radio resource control reestablishment in the related art.

[0284] In an embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0285] In a case where the cell selected by the terminal is a candidate cell for which radio resource control parameters are pre-configured, the connection recovery with the terminal is performed on the candidate cell according to the radio resource control parameters.

[0286] In an embodiment, the candidate cell can be selected by the network device for the terminal according to measurement and measurement result reporting through L3 before the terminal performs at least one cell change, and the network device configures radio resource control parameters of the candidate cell for the terminal.

[0287] In a case where the terminal performs cell selection and selects the candidate cell, the network device performs connection recovery with the terminal on the candidate cell according to the pre-configured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameters of the candidate cell are configured for the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure radio resource control parameters other than the pre-configured radio resource control parameters for the terminal in the embodiment.

[0288] In an embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0289] The terminal is instructed to perform connection recovery on the selected cell according to the radio resource control parameters configured for the source cell;

[0290] Resuming connection with the terminal on the selected cell according to the radio resource control parameter configured to the source cell.

[0291] In one embodiment, the network device can instruct the terminal to resume connection on the selected cell according to the radio resource control parameter configured to the source cell. Since the radio resource control parameter of the source cell has been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with the radio resource control parameter other than the pre-configured radio resource control parameter in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with the radio resource control parameter by the network device in the connection resumption process, and further beneficial to complete the connection resumption as soon as possible.

[0292] As to Figure 10 The embodiments shown in the above can be implemented independently or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented: Figure 8

[0293] In the case that the terminal fails in at least one cell change, maintaining the connection between the source cell and the terminal, and resuming connection with the terminal through the source cell.

[0294] The related embodiments can be referred to the above description, and the related embodiments can be implemented independently or combined as needed, and the present disclosure is not limited.

[0295] Figure 11 is a schematic flow chart of another cell change failure processing method according to the embodiments of the present disclosure. As shown in Figure 11 The resuming connection with the terminal includes:

[0296] In step S1101, the terminal resumes connection with the cell determined to meet the evaluation condition through evaluation on the plurality of cells.

[0297] In one embodiment, the terminal can determine a plurality of cells before at least one cell change, for example, the plurality of cells can be determined according to the protocol agreement, and the plurality of cells can also be determined according to the cell list configured by the network device. The terminal can evaluate the plurality of cells and determine the cell meeting the evaluation condition, and then the network device can resume connection with the terminal through the cell meeting the evaluation condition after the failure of at least one cell change (for example, based on radio resource control reestablishment), and the terminal does not need to perform cell selection operation. Accordingly, it is beneficial to quickly complete the connection resumption.

[0298] The way of evaluating the plurality of cells can be set as needed, and the present disclosure is not limited. For example, it can be implemented based on the related embodiments on the terminal side, which will not be described here. ​

[0299] In one embodiment, the predetermined plurality of cells comprises at least one of:

[0300] a source cell;

[0301] a candidate cell pre-provisioned with radio resource control parameters.

[0302] In one embodiment, in a case where the source cell satisfies the evaluation condition, since the radio resource control parameters of the source cell are known to the terminal, the network device can not need to configure the radio resource control parameters of the source cell for the terminal again when the terminal performs connection recovery through the source cell, and accordingly, it is beneficial to simplify the process of configuring the radio resource control parameters for the terminal by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0303] In one embodiment, in a case where the candidate cell satisfies the evaluation condition, the terminal performs connection recovery through the candidate cell. The candidate cell can be selected by the network device for the terminal according to measurement results reported by the terminal through L3 before the terminal performs at least one cell change, and the network device configures radio resource control parameters (such as physical downlink control channel resources) of the candidate cell for the terminal.

[0304] Since the terminal performs at least one cell change, the reason is generally that the service quality of the source cell is relatively poor, and after the at least one cell change fails, the connection recovery is performed through the source cell, and the source cell can not be a suitable cell. If the connection recovery is performed through the radio resource control reestablishment after the at least one cell change fails, since the cell selection needs to be performed, the time consumption is relatively long, and the connection interruption time is relatively long.

[0305] According to the present embodiment, since the radio resource control parameters of the candidate cell are configured by the network device to the terminal before the terminal performs at least one cell selection, the network device only needs to configure the radio resource control parameters other than the pre-provisioned radio resource control parameters to the terminal for the candidate cell. Accordingly, compared with the connection recovery through the source cell, it is beneficial to perform the connection recovery through a more suitable cell, and compared with the connection recovery through the radio resource control reestablishment, it is beneficial to simplify the process of configuring the radio resource control parameters for the terminal by the network device in the connection recovery process, so as to complete the connection recovery as soon as possible.

[0306] In one embodiment, the connection recovery with the terminal further comprises:

[0307] In a case where there is no cell satisfying the evaluation condition, performing the radio resource control reestablishment through a cell selected by the terminal to recover the connection.

[0308] In one embodiment, the terminal evaluates a plurality of cells, and it is possible that there is no cell satisfying the evaluation condition. In this case, the terminal can perform cell selection, and the network device can perform radio resource control reestablishment through the cell selected by the terminal to recover the connection.

[0309] It should be noted that the radio resource control reestablishment in this embodiment can be different from the radio resource control reestablishment in the related art.

[0310] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0311] In the case where the cell selected by the terminal is a candidate cell preconfigured with radio resource control parameters, the connection with the terminal is recovered on the candidate cell according to the radio resource control parameters.

[0312] In one embodiment, the candidate cell can be a cell selected by the network device for the terminal according to measurement results reported by the terminal through L3 measurement before at least one cell change of the terminal, and the network device configures the terminal with radio resource control parameters of the candidate cell.

[0313] In the case where the terminal selects the candidate cell through cell selection, the network device recovers the connection with the terminal on the candidate cell according to the preconfigured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment in the related art, since the radio resource control parameters of the candidate cell are configured to the terminal by the network device before at least one cell selection of the terminal, the network device only needs to configure the terminal with radio resource control parameters other than the preconfigured radio resource control parameters in this embodiment.

[0314] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0315] The terminal is instructed to recover the connection on the selected cell according to the radio resource control parameters configured to the source cell.

[0316] The connection with the terminal is recovered on the selected cell according to the radio resource control parameters configured to the source cell.

[0317] In one embodiment, the network device can instruct the terminal to perform connection recovery on the selected cell according to the radio resource control parameters configured to the source cell. Since the radio resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with the radio resource control parameters other than the pre-configured radio resource control parameters in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with the radio resource control parameters by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0318] With regard to Figure 11 The embodiments shown in the above can be independently implemented, or implemented on the basis of any of the embodiments described above. For example, the embodiments shown in the above can be implemented according to the following steps on the basis of any of the embodiments shown in the above: Figure 8

[0319] In the case that the terminal fails to perform at least one cell change, the terminal performs connection recovery on the cell satisfying the evaluation condition determined by evaluating the plurality of cells.

[0320] The related embodiments can be referred to the above description, and the related embodiments can be independently implemented or combined according to the needs, and the present disclosure is not limited.

[0321] Figure 12 is a schematic flow chart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in the above, the connection recovery with the terminal includes: Figure 12

[0322] In step S1201, a command of at least one cell change is sent to the terminal, and the command is used to indicate a cell for connection recovery;

[0323] In step S1202, connection recovery is performed with the terminal through the cell for connection recovery.

[0324] In one embodiment, before the terminal performs at least one cell change, the network device can instruct the terminal with a cell for connection recovery, so that the terminal does not need to perform cell selection when performing connection recovery after at least one cell change failure, and the network device can perform connection recovery with the terminal through the cell for connection recovery instructed to the terminal. For example, the network device can indicate the cell for connection recovery in the command of at least one cell change sent to the terminal.

[0325] In one embodiment, the connection recovery with the terminal further includes:

[0326] ​​When the connection recovery through the cell for connection recovery and the terminal fails, the terminal performs radio resource control reestablishment through the cell selected by the terminal to recover the connection.

[0327] In one embodiment, the terminal performs connection recovery through the cell for connection recovery indicated by the network device, and needs to access the source cell. For example, at least one cell change failure message is sent to the cell for connection recovery, and when downlink transmission of the cell for connection recovery is received, it can be determined that the access to the cell for connection recovery is successful. If the downlink transmission of the cell for connection recovery is not received, for example, the downlink transmission of the cell for connection recovery is not received within a fifth preset time range from the time when the at least one cell change failure message is sent to the cell for connection recovery, it can be determined that the access to the cell for connection recovery fails, and then the terminal can perform cell selection. The network device can perform radio resource control reestablishment with the terminal through the cell selected by the terminal to recover the connection.

[0328] It should be noted that the radio resource control reestablishment in the embodiment can be different from the radio resource control reestablishment in the related art.

[0329] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0330] In a case where the cell selected by the terminal is a candidate cell preconfigured with radio resource control parameters, the terminal performs connection recovery with the network device on the candidate cell according to the radio resource control parameters.

[0331] In one embodiment, the candidate cell can be a cell selected by the network device for the terminal according to measurement results reported by the terminal through L3 before the terminal performs at least one cell change, and the network device configures the terminal with radio resource control parameters of the candidate cell.

[0332] In a case where the terminal performs cell selection and selects a candidate cell, the network device performs connection recovery with the terminal on the candidate cell according to the preconfigured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameters of the candidate cell are configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the preconfigured radio resource control parameters in the embodiment.

[0333] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal includes:

[0334] The terminal is instructed to perform connection recovery on the selected cell according to the radio resource control parameters configured to the source cell.

[0335] resumes connection with the terminal on the selected cell according to the radio resource control parameters configured to the source cell.

[0336] In one embodiment, the network device can instruct the terminal to resume connection on the selected cell according to the radio resource control parameters configured to the source cell. Since the radio resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the pre-configured radio resource control parameters in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with radio resource control parameters by the network device in the connection resume process, and further beneficial to complete the connection resume as soon as possible.

[0337] As to Figure 12 The embodiments shown in the above can be implemented independently, or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented: Figure 8 The embodiments shown in the above can be implemented independently, or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented:

[0338] In the case that the terminal fails in at least one cell change, a command of at least one cell change is sent to the terminal, and the command is used to indicate a cell for connection resume;

[0339] Connection is resumed with the terminal on the cell for connection resume.

[0340] The related embodiments can be referred to the above description, and the related embodiments can be implemented independently or combined as needed according to the following embodiments, and the present disclosure is not limited.

[0341] Figure 13 is a schematic flow chart of another cell change failure processing method according to an embodiment of the present disclosure. As shown in Figure 13 The connection resume with the terminal includes:

[0342] In step S1301, radio resource control reestablishment is performed on the cell selected by the terminal to resume connection.

[0343] In one embodiment, when the network device determines that the terminal fails in at least one cell change, the network device can perform radio resource control reestablishment with the terminal on the selected cell selected by the terminal to resume connection.

[0344] It should be noted that the radio resource control reestablishment in the embodiments of the present disclosure is different from the radio resource control reestablishment in the existing backbone technology, which will be described in the following several embodiments.

[0345] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal comprises:

[0346] In the case that the cell selected by the terminal is a candidate cell preconfigured with radio resource control parameters, connection recovery is performed with the terminal on the candidate cell according to the radio resource control parameters.

[0347] In one embodiment, the candidate cell can be a cell through which the terminal performs L3 measurement and reports measurement results before performing at least one cell change, and the network device selects the cell for the terminal according to the measurement results and configures radio resource control parameters of the cell for the terminal.

[0348] In the case that the terminal performs cell selection and selects a candidate cell, the network device performs connection recovery with the terminal on the candidate cell according to preconfigured radio resource control parameters of the candidate cell. Compared with the radio resource control reestablishment process in the related art, since the radio resource control parameters of the candidate cell are configured for the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure radio resource control parameters other than the preconfigured radio resource control parameters for the terminal in this embodiment. Accordingly, this is conducive to simplifying the process of configuring radio resource control parameters for the terminal by the network device in the connection recovery process, and further conducive to completing the connection recovery as soon as possible.

[0349] The number n of attempts of connection recovery by the terminal through the candidate cell can be limited, for example, the number of attempts can be determined based on a protocol agreement or indicated by the network device. In the case that the terminal fails to perform connection recovery through the candidate cell, the terminal can again fail to perform connection recovery through the candidate cell until the number of attempts n is reached, and then can perform connection recovery through other ways, so as to avoid too many attempts and slow connection recovery and waste resources.

[0350] In one embodiment, the radio resource control reestablishment through the cell selected by the terminal comprises:

[0351] The terminal is instructed to perform connection recovery on the selected cell according to the radio resource control parameters configured for the source cell.

[0352] Connection recovery is performed with the terminal on the selected cell according to the radio resource control parameters configured for the source cell.

[0353] In one embodiment, the network device can instruct the terminal to perform connection recovery on the selected cell according to the radio resource control parameters configured to the source cell. Since the radio resource control parameters of the source cell have been configured to the terminal by the network device before the terminal performs at least one cell selection, the network device only needs to configure the terminal with radio resource control parameters other than the pre-configured radio resource control parameters in this embodiment. Accordingly, it is beneficial to simplify the process of configuring the terminal with radio resource control parameters by the network device in the connection recovery process, and further beneficial to complete the connection recovery as soon as possible.

[0354] With regard to Figure 13 The embodiments shown in the above can be implemented independently, or on the basis of any of the embodiments described above. For example, on the basis of the embodiments shown in the above, the following steps can be implemented: Figure 8

[0355] In the case that the terminal fails in at least one cell change, the terminal performs radio resource control reestablishment on the selected cell to recover the connection.

[0356] The related embodiments can refer to the description above, and the related embodiments can be implemented independently or combined as needed according to the following embodiments, and the present disclosure is not limited.

[0357] Corresponding to the embodiments of the cell change failure processing method described above, the present disclosure also provides embodiments of a cell change failure processing apparatus.

[0358] Figure 14 is a schematic block diagram of a cell change failure processing apparatus according to an embodiment of the present disclosure. The cell change failure processing apparatus shown in this embodiment can be a terminal, or an apparatus composed of modules in a terminal, including but not limited to a mobile phone, a tablet computer, a wearable device, a sensor, an Internet of Things device, and the like. The terminal can communicate with a network device, including but not limited to a network device in a 4G, 5G, 6G, and the like communication system, such as a base station, a core network, and the like.

[0359] As Figure 14 described, the cell change failure processing apparatus includes:

[0360] The processing module 1401 is configured to determine that at least one cell change has failed.

[0361] The connection module 1402 is configured to perform connection recovery.

[0362] In one embodiment, the processing module is configured to determine that at least one cell change has failed when a timer associated with the at least one cell change expires.

[0363] ​In one embodiment, the event triggering the timer to start counting down comprises at least one of the following: receiving a change command sent by a first cell in the at least one cell; sending feedback of the change command to the first cell; determining that a condition triggering the at least one cell change is met; releasing a primary cell in the at least one cell.

[0364] In one embodiment, in case that the at least one cell change is a random access based change, the event triggering the timer to end counting down comprises: success of random access initiated to a target cell.

[0365] In one embodiment, in case that the at least one cell change is a non-random access based change, the event triggering the timer to end counting down comprises at least one of the following: receiving a downlink transmission sent by a target cell; receiving a downlink control information sent by the target cell for scheduling a new transmission; receiving feedback information indicating that access is successful.

[0366] In one embodiment, the feedback information comprises at least one of the following: radio resource control layer signaling; medium access control layer signaling; physical layer signaling.

[0367] In one embodiment, the connection module is configured to, in case that a secondary cell group exists, send at least one cell change failure information to the secondary cell group; and perform connection recovery according to control of the secondary cell group.

[0368] In one embodiment, the connection module is further configured to, in case that a secondary cell group does not exist, perform cell selection, and perform radio resource control reestablishment through a selected cell to recover connection.

[0369] In one embodiment, the connection module is configured to perform connection recovery through a source cell.

[0370] In one embodiment, the connection module is configured to send at least one cell change failure information to the source cell; and access the source cell.

[0371] In one embodiment, the connection module is further configured to, in case that access to the source cell fails, perform cell selection, and perform radio resource control reestablishment through a selected cell to recover connection.

[0372] In one embodiment, the processing module is further configured to evaluate a plurality of predetermined cells; and determine a cell meeting an evaluation condition; wherein the connection module is configured to perform connection recovery through the cell meeting the evaluation condition.

[0373] In an embodiment, the predetermined plurality of cells comprises at least one of the following: a source cell; a candidate cell pre-configured with radio resource control parameters.

[0374] In an embodiment, the connection module is further configured to, in the absence of a cell satisfying the evaluation condition, perform cell selection, and perform radio resource control reestablishment through the selected cell to resume the connection.

[0375] In an embodiment, the connection module is configured to determine a cell indicated by the network device for connection resumption; and perform connection resumption through the cell for connection resumption.

[0376] In an embodiment, the connection module is further configured to, in the event that the connection resumption through the cell for connection resumption fails, perform cell selection, and perform radio resource control reestablishment through the selected cell to resume the connection.

[0377] In an embodiment, the connection module is configured to perform cell selection, and perform radio resource control reestablishment through the selected cell to resume the connection.

[0378] In an embodiment, the connection module is configured to, in the event that the selected cell is a candidate cell pre-configured with radio resource control parameters, perform connection resumption on the candidate cell according to the radio resource control parameters.

[0379] In an embodiment, the connection module is configured to, based on an indication of the network device, perform connection resumption on the selected cell according to radio resource control parameters configured to the source cell.

[0380] In an embodiment, the at least one cell comprises at least one of the following: a master cell group; a master cell; a master cell and at least one secondary cell.

[0381] Figure 15 is a schematic block diagram of a cell change failure handling apparatus according to an embodiment of the present disclosure. The cell change failure handling apparatus shown in the embodiment can be a network device, or an apparatus composed of modules in a network device, which can communicate with a terminal. The terminal includes but is not limited to a mobile phone, a tablet computer, a wearable device, a sensor, an Internet of Things device, and the like. The network device includes but is not limited to a network device in a 4G, 5G, 6G, and the like communication system, such as a base station, a core network, and the like.

[0382] As Figure 15 described, the cell change failure handling apparatus comprises:

[0383] The connection module 1501 is configured to perform connection recovery with the terminal in a case where at least one cell change failure occurs in the terminal.

[0384] In one embodiment, the connection module is configured to receive at least one cell change failure information sent by the terminal through a secondary cell group configured for the terminal, and control the terminal to perform connection recovery through the secondary cell group.

[0385] In one embodiment, the connection module is further configured to perform radio resource control reestablishment through a cell selected by the terminal to recover connection in a case where a secondary cell group is not configured for the terminal or the secondary cell group configured for the terminal is unavailable.

[0386] In one embodiment, the connection module is configured to maintain connection of a source cell with the terminal, and perform connection recovery with the terminal through the source cell.

[0387] In one embodiment, the connection module is configured to receive at least one cell change failure information sent by the terminal through the source cell.

[0388] In one embodiment, the connection module is further configured to perform radio resource control reestablishment through a cell selected by the terminal to recover connection in a case where the terminal fails to access the source cell.

[0389] In one embodiment, the connection module is configured to perform connection recovery through a cell satisfying an evaluation condition determined by the terminal from a plurality of predetermined cells.

[0390] In one embodiment, the plurality of predetermined cells include at least one of the following: a source cell; a candidate cell pre-configured with a radio resource control parameter.

[0391] In one embodiment, the connection module is configured to perform radio resource control reestablishment through a cell selected by the terminal to recover connection in a case where there is no cell satisfying the evaluation condition.

[0392] In one embodiment, the apparatus further includes a sending module configured to send at least one cell change command to the terminal, the command being used to indicate a cell for connection recovery; and the connection module is configured to perform connection recovery with the terminal through the cell for connection recovery.

[0393] In one embodiment, the connection module is further configured to perform radio resource control reestablishment through a cell selected by the terminal to recover connection in a case where connection recovery with the terminal through the cell for connection recovery fails.

[0394] In one embodiment, the connection module is configured to perform radio resource control reestablishment over the selected cell by the terminal to resume the connection.

[0395] In one embodiment, the connection module is configured to perform connection resume with the terminal over the candidate cell according to the radio resource control parameters pre-configured for the candidate cell in case that the selected cell by the terminal is the candidate cell.

[0396] In one embodiment, the apparatus further comprises a sending module configured to instruct the terminal to perform connection resume over the selected cell according to the radio resource control parameters configured for the source cell; wherein the connection module is configured to perform connection resume with the terminal over the selected cell according to the radio resource control parameters configured for the source cell.

[0397] In one embodiment, a timer-based cell switch failure recovery procedure is introduced.

[0398] In one embodiment, regarding cell switch failure detection:

[0399] In one embodiment, a new timer can be defined.

[0400] In one embodiment, regarding the start time of the timer, at least one of the following four cases can be included:

[0401] Case 1: when the cell switch command is received

[0402] Case 2: when the cell switch command feedback (i.e. HARQ / MAC CE) is sent to the source MCG;

[0403] Case 3: when the cell switch triggering event is met (for user-triggered cell switch);

[0404] Case 4: after the Pcell is released;

[0405] In one embodiment, regarding the end time of the timer:

[0406] For the case of RACH-based cell switch, the end time of the timer:

[0407] Successful RACH (Msg4 / MsgB), i.e. the user completes the random access procedure to the target cell;

[0408] For RACH-less cell switch, the timer can be ended in one of the following three cases:

[0409] Case 1: The first time the user receives a DL transmission from the target cell, specifically, a PDCCH transmission scrambled by the user's C-RNTI;

[0410] Case 2: The first time the user receives a DCI scheduling a new uplink or downlink transmission, and the DCI is scrambled by the user's C-RNTI;

[0411] Case 3: The user receives an explicit network feedback, which can be a specific MAC CE or RRC message. If a MAC CE is used, there can be two formats. Format 1: define a new MAC CE; Format 2: multiplex the Contention resolution MAC CE, just set the value of this MAC CE to a predefined value such as all 1 or 0.

[0412] When the timer expires, it is considered that a cell switch failure has occurred.

[0413] In one embodiment, regarding the recovery of cell switch failure, it can be implemented based on at least one of the following methods.

[0414] In one embodiment, method one: if the terminal has an available SCG, and the network configures or agrees with the terminal to report MCG failure to the SCG, and then the SCG controls the connection recovery. Further, if the MCG failure, and the SCG is also unavailable, the following connection recovery (method two) is triggered.

[0415] In one embodiment, method two: the UE performs cell selection and performs RRC reestablishment through the selected cell to recover the connection, which mainly includes the following two cases:

[0416] Case 1: If the selected cell is a cell in the candidate configuration, then the connection recovery is performed through the candidate configuration, and the candidate configuration is used n times in the failure process.

[0417] Case 2: In the process of RRC reestablishment, it can be indicated by the network whether to perform link recovery through the configuration of the cell in the source MCG before the switch.

[0418] In one embodiment, way three: skip cell selection procedure, directly through source cell to resume connection:

[0419] For source cell, need to keep connection with user, wait for user to access target cell successfully, feedback from target cell, then release link between user and source cell.

[0420] User reports failure to source cell, does not perform RRC reestablishment, directly accesses source cell.

[0421] If failure, perform cell selection and RRC reestablishment procedure (i.e. perform way two again).

[0422] In one embodiment, way four: because the reason for handover is that the service quality of source cell is relatively poor, the source cell in way three may not be a suitable cell. In way two, after failure, cell selection needs to be performed, which will cause a long interruption time. Therefore, consider selecting a good cell for recovery in advance, and once failure occurs, directly perform RRC reestablishment through the selected cell to resume connection.

[0423] Configure a cell list for the user, and the default is each candidate cell and serving cell. Evaluate the cells in the list, and if a certain condition is met, the corresponding cell is selected as a possible recovery cell.

[0424] Evaluation method: use the beam average Q of the cell to represent the channel condition of the cell. If Q is greater than a certain threshold T1, it is selected as a candidate recovery cell. If a cell that has been selected as a candidate recovery cell does not meet the condition at a certain time, it will be removed from the candidate recovery cell; or, it is specified that a certain cell can only be selected as a candidate recovery cell if its Q is greater than the threshold for N consecutive evaluations. If the Q of a certain cell is less than a certain threshold T2 for M consecutive evaluations, it is removed.

[0425] When cell switch failure occurs, if there is a recovery cell that meets the condition, resume connection through the cell;

[0426] Or, if TA management is performed in advance to inform the TA of the cell, send an access message to the cell through reserved resources;

[0427] If there are multiple recovery cells that meet the condition, the user selects one cell for recovery

[0428] If no cell meets the condition, cell selection is performed, and connection recovery is performed (i.e., the recovery mode of mode two is performed again).

[0429] In one embodiment, mode five: multiple cells are indicated in the cell switch command, one as the target cell and the other as an alternative cell for recovery. If failure, connection recovery is performed through the cell. If recovery fails, cell selection is performed again, and RRC reestablishment is performed.

[0430] It should be noted that the above various embodiments can be combined with each other as needed, and the order can be adjusted.

[0431] As to the apparatus in the above embodiments, the specific manner in which each module performs the operation has been described in detail in the embodiment of the related method, and will not be described in detail here.

[0432] For the apparatus embodiment, since it basically corresponds to the method embodiment, the related part is described in the part of the method embodiment. The apparatus embodiment described above is only schematic, and the modules described as separate components can or can not be physically separate, and the components displayed as modules can or can not be physical modules, i.e., they can be located in one place, or distributed on multiple network modules. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0433] Embodiments of the present disclosure also propose a cell change failure processing system, comprising a terminal and a network device, wherein the terminal is configured to implement the cell change failure processing method performed by the terminal according to any of the above embodiments, and the network device is configured to implement the cell change failure processing method performed by the network device according to any of the above embodiments.

[0434] Embodiments of the present disclosure also propose a communication apparatus, comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the cell change failure processing method performed by the terminal according to any of the above embodiments is implemented.

[0435] Embodiments of the present disclosure also propose a communication apparatus, comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the cell change failure processing method performed by the network device according to any of the above embodiments is implemented.

[0436] Embodiments of the present disclosure further provide a computer readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the cell change failure handling method performed by the terminal according to any of the above embodiments.

[0437] Embodiments of the present disclosure further provide a computer readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the cell change failure handling method performed by the network device according to any of the above embodiments.

[0438] As shown in Figure 16 , Figure 16 is a schematic block diagram of an apparatus 1600 for cell change failure handling according to an embodiment of the present disclosure. The apparatus 1600 can be provided as a base station. As shown in Figure 16 , the apparatus 1600 includes a processing component 1622, a wireless receiving / transmitting component 1624, an antenna component 1626, and a signal processing part specific to the wireless interface. The processing component 1622 can further include one or more processors. One of the processors in the processing component 1622 can be configured to implement the cell change failure handling method performed by the network device according to any of the above embodiments.

[0439] Figure 17 is a schematic block diagram of an apparatus 1700 for cell change failure handling according to an embodiment of the present disclosure. For example, the apparatus 1700 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0440] As shown in Figure 17 , the apparatus 1700 can include one or more of the following components: a processing component 1702, a memory 1704, a power supply component 1706, a multimedia component 1708, an audio component 1710, an input / output (I / O) interface 1712, a sensor component 1714 and a communication component 1716.

[0441] The processing component 1702 generally controls the overall operation of the apparatus 1700 such as the operations associated with display, phone calls, data communications, camera operations and recording operations. The processing component 1702 can include one or more processors 1720 to execute instructions to complete all or a part of steps of the cell change failure handling method performed by the terminal according to the above embodiments. Further, the processing component 1702 can include one or more modules to facilitate interaction between the processing component 1702 and other components. For example, the processing component 1702 can include a multimedia module to facilitate the interaction between the multimedia component 1708 and the processing component 1702.

[0442] The memory 1704 is configured to store various types of data to support the operation of the device 1700. Examples of these data include instructions for any application or method operating on the device 1700, contact data, phonebook data, messages, pictures, videos, and the like. The memory 1704 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic disc or optical disc.

[0443] The power supply component 1706 supplies power for the various components of the device 1700. The power supply component 1706 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 1700.

[0444] The multimedia component 1708 includes a screen providing an output interface between the device 1700 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swiping, and gestures on the touch panel. The touch sensors can not only sense a boundary of a touching or swiping action, but also detect duration and pressure related to the touching or swiping action. In some embodiments, the multimedia component 1708 includes a front camera and / or a rear camera. The front and rear cameras can receive external multimedia data when the device 1700 is in an operating mode, such as a shooting mode or a video mode. Each of the front and rear cameras can be a fixed optical lens system or have a focal length and optical zoom capability.

[0445] The audio component 1710 is configured to output and / or input audio signals. For example, the audio component 1710 includes a microphone (MIC) configured to receive external audio signals when the device 1700 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 1704 or transmitted via the communication component 1716. In some embodiments, the audio component 1710 also includes a speaker for outputting audio signals.

[0446] The I / O interface 1712 provides an interface between the processing component 1702 and peripheral interface modules, which can be a keyboard, a click wheel, a button, and the like. These buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0447] The sensor component 1714 includes one or more sensors to provide status assessments for various aspects of the device 1700. For example, the sensor component 1714 can detect an open / closed status of the device 1700, relative positioning of components, such as a display and keypad of the device 1700, a change in position of the device 1700 or a component of the device 1700, the presence or absence of user contact with the device 1700, the orientation or acceleration / deceleration of the device 1700, and a temperature change of the device 1700. The sensor component 1714 can include proximity sensor(s) configured to detect the presence of nearby objects without any physical touch. The sensor component 1714 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 1714 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0448] The communication component 1716 is configured to facilitate wired or wireless communication between the device 1700 and another device. The device 1700 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G LTE, 5G NR, or a combination thereof. In an example embodiment, the communication component 1716 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 1716 can also include a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) techniques, infrared data association (IrDA) techniques, ultra-wideband (UWB) techniques, Bluetooth (BT) techniques, and other techniques.

[0449] In an example embodiment, the device 1700 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements, for performing the above-described cell change failure handling method by a terminal.

[0450] In an example embodiment, a non-transitory computer-readable storage medium including instructions, such as the memory 1704 including instructions, is also provided, which can be executed by the processor 1720 of the device 1700 to complete the above-described cell change failure handling method by a terminal. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc.

[0451] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0452] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0453] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0454] The methods and apparatus provided in the embodiments of this disclosure have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this disclosure. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this disclosure. Therefore, the content of this specification should not be construed as a limitation of this disclosure.

Claims

1. A cell change failure handling method, characterized by, The method is performed by a terminal, and the method comprises: determining at least one cell change failure; performing connection recovery; The performing connection recovery comprises: performing cell selection, and performing radio resource control reestablishment through the selected cell to recover the connection; the performing radio resource control reestablishment through the selected cell to recover the connection comprises: in a case where the selected cell is a candidate cell for which radio resource control parameters are pre-configured, performing connection recovery on the candidate cell according to the radio resource control parameters; wherein the terminal performs layer 3 (L3) measurement and reports measurement results before performing at least one cell change.

2. The method of claim 1, wherein, The determining at least one cell change failure comprises: determining at least one cell change failure when a timer associated with the at least one cell change expires.

3. The method of claim 2, wherein, Events triggering the timer to start timing comprise at least one of: receiving a change command sent by a first cell in the at least one cell; sending feedback of the change command to the first cell; determining that a condition triggering the at least one cell change is met; releasing a primary cell in the at least one cell.

4. The method of claim 2, wherein, In a case where the at least one cell change is a random access-based change, events triggering the timer to end timing comprise: successful initiation of random access to a target cell.

5. The method of claim 2, wherein, In a case where the at least one cell change is a non-random access-based change, events triggering the timer to end timing comprise at least one of: receiving downlink transmission sent by a target cell; receiving downlink control information sent by the target cell for scheduling new transmission; receiving feedback information indicating that access is successful.

6. The method of claim 5, wherein, The feedback information comprises at least one of: radio resource control layer signaling; medium access control layer signaling; physical layer signaling.

7. The method according to any one of claims 1 to 6, characterized in that, The at least one cell comprises at least one of: a master cell group; a primary cell; a primary cell and at least one secondary cell.

8. The method according to any one of claims 1 to 6, characterized in that, The measurement results are reported to a network device, and the measurement results are used by the network device to select the candidate cell for the terminal and to configure radio resource control parameters of the candidate cell for the terminal.

9. A cell change failure handling method, characterized by, The method is performed by a network device, and the method comprises: in a case where at least one cell change of a terminal fails, performing connection recovery with the terminal; The performing connection recovery with the terminal comprises: performing radio resource control reestablishment through a cell selected by the terminal to recover the connection; the performing radio resource control reestablishment through the cell selected by the terminal comprises: in a case where the cell selected by the terminal is a candidate cell for which radio resource control parameters are pre-configured, performing connection recovery with the terminal on the candidate cell according to the radio resource control parameters; wherein the network device receives measurement results measured and reported by the terminal through layer 3 (L3) before the terminal performs at least one cell change.

10. The method of claim 9, wherein, The at least one cell comprises at least one of: a master cell group; a primary cell; a primary cell and at least one secondary cell.

11. The method of any one of claims 9-10, wherein, The measurement results are used by the network device to select the candidate cell for the terminal and to configure radio resource control parameters of the candidate cell for the terminal.

12. A cell change failure handling apparatus characterized by comprising: The apparatus comprises: a processing module configured to determine at least one cell change failure; a connecting module configured to perform connection recovery; the performing connection recovery comprises performing cell selection and performing radio resource control reestablishment through the selected cell to recover connection; the performing radio resource control reestablishment through the selected cell to recover connection comprises, in a case that the selected cell is a candidate cell pre-configured with radio resource control parameters, performing connection recovery on the candidate cell according to the radio resource control parameters; wherein the apparatus is configured to receive measurement results measured and reported by the terminal through layer 3 (L3) before performing at least one cell change.

13. A cell change failure handling apparatus, characterized by comprising: the apparatus comprises: a connecting module configured to perform connection recovery with the terminal in a case that the terminal fails to perform at least one cell change; the performing connection recovery with the terminal comprises performing radio resource control reestablishment through a cell selected by the terminal to recover connection; the performing radio resource control reestablishment through the cell selected by the terminal comprises, in a case that the cell selected by the terminal is a candidate cell pre-configured with radio resource control parameters, performing connection recovery with the terminal on the candidate cell according to the radio resource control parameters; wherein the apparatus is configured to receive measurement results measured and reported by the terminal through layer 3 (L3) before performing at least one cell change.

14. A cell change failure handling system characterized by comprising: comprising a terminal and a network device, wherein the terminal is configured to implement the cell change failure processing method of any one of claims 1 to 8, and the network device is configured to implement the cell change failure processing method of any one of claims 9 to 11.

15. A communications device, characterized by comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the cell change failure processing method of any one of claims 1 to 8 is implemented.

16. A communications device, characterized by comprising: a processor; a memory for storing a computer program; wherein when the computer program is executed by the processor, the cell change failure processing method of any one of claims 9 to 11 is implemented.

17. A computer readable storage medium for storing a computer program, characterized in that, when the computer program is executed by the processor, the cell change failure processing method of any one of claims 1 to 8 is implemented.

18. A computer readable storage medium for storing a computer program, characterized in that, when the computer program is executed by the processor, the cell change failure processing method of any one of claims 9 to 11 is implemented. when the computer program is executed by the processor, the cell change failure processing method of any one of claims 1 to 8 is implemented. when the computer program is executed by the processor, the cell change failure processing method of any one of claims 9 to 11 is implemented.

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