WO2023130274A1 - Connection establishment method and apparatus, computer device, storage medium, and program product - Google Patents

Abstract

A connection establishment method and apparatus, a computer device, a storage medium, and a program product, relating to the technical field of wireless communications. The method comprises: when a terminal device is in a dual connectivity state and a secondary cell group (SCG) connection fails, restoring or reconstructing an SCG connection by means of a first cell, the first cell being a cell that the terminal device has stored corresponding target configuration information and that satisfies a first condition (201). According to the solution, there is no need to wait for an MCG to trigger a reconfiguration process, the unnecessary reconfiguration process is reduced, extra time delay and signaling overhead caused by the reconfiguration process are reduced, the efficiency of network transmission is improved, and the user experience is improved.

Description

Connection establishment method, device, computer equipment, storage medium and program product technical field

The present application relates to the technical field of wireless communication, and in particular to a connection establishment method, device, computer equipment, storage medium and program product.

Background technique

The dual connectivity (Dual Connectivity, DC) scenario is a scenario that utilizes two wireless connections for data communication at the same time.

In the DC scenario, the terminal and the network side can simultaneously establish a wireless connection based on the Master Cell Group (MCG) and a wireless connection based on the Secondary Cell Group (SCG), and pass the above two connections at the same time communicate with the network side.

Contents of the invention

Embodiments of the present application provide a connection establishment method, device, computer equipment, storage medium, and program product. Described technical scheme is as follows:

On the one hand, an embodiment of the present application provides a method for establishing a connection, the method is executed by a terminal device, and the method includes:

When the terminal device is in the dual connectivity state and the secondary cell group SCG connection fails, restore or re-establish the secondary cell group SCG connection through the first cell;

The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition.

On the one hand, an embodiment of the present application provides a method for receiving information, the method is executed by a network side device, and the method includes:

Receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or re-establishment;

Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

In yet another aspect, an embodiment of the present application provides an apparatus for establishing a connection, and the apparatus includes:

A connection module, configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connection state and the SCG connection fails;

The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition.

In yet another aspect, an embodiment of the present application provides an information receiving device, the device comprising:

The receiving module is used to receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or reconstruction;

Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

On the other hand, an embodiment of the present application provides a computer device, the computer device is implemented as a terminal device, and the computer device includes a processor, a memory, and a transceiver;

The transceiver is configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connectivity state and the SCG connection fails;

The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition.

On the other hand, an embodiment of the present application provides a computer device, the computer device is implemented as a network side device, and the computer device includes a processor, a memory, and a transceiver;

The transceiver receives SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or reconstruction;

Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

In yet another aspect, the embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is loaded and executed by a processor to implement the above connection establishment method or information reception method.

In another aspect, a computer program product or computer program is provided, the computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the above connection establishment method or information reception method.

The technical solutions provided in the embodiments of the present application can bring the following beneficial effects:

When the terminal device is in the dual connection state and the SCG connection fails, the terminal device can autonomously select a cell that meets the first condition from the cells that have stored the corresponding target configuration information to restore the SCG connection or re-establish the SCG connection without waiting The MCG triggers the reconfiguration process, which reduces unnecessary reconfiguration processes, reduces additional delay and signaling overhead caused by the reconfiguration process, improves network transmission efficiency, and improves user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of a network architecture of a communication system provided by an embodiment of the present application;

FIG. 2 is a flowchart of a method for establishing a connection provided by an embodiment of the present application;

FIG. 3 is a flowchart of an information receiving method provided by an embodiment of the present application;

FIG. 4 is a flowchart of a method for establishing a connection provided by an embodiment of the present application;

FIG. 5 is a block diagram of a connection establishment device provided by an embodiment of the present application;

Fig. 6 is a block diagram of an information receiving device provided by an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a computer device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

The network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. The evolution of the technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

Please refer to FIG. 1 , which shows a schematic diagram of a network architecture of a communication system provided by an embodiment of the present application. The network architecture may include: a terminal 10 and a base station 20 .

The number of terminals 10 is generally multiple, and one or more terminals 10 may be distributed in a cell managed by each base station 20 . The terminal 10 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (User Equipment, UE), mobile station ( Mobile Station, MS), terminal device (terminal device) and so on. For convenience of description, in the embodiment of the present application, the above-mentioned devices are collectively referred to as terminals.

The base station 20 is a device deployed in an access network to provide a wireless communication function for the terminal 10 . The base station 20 may include various forms of satellite base stations, macro base stations, micro base stations, relay stations, access points and so on. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, in the 5th-Generation (5G) New Radio (New Radio, NR) system, It is called gNodeB or gNB. The name "base station" may change as communication technology evolves. For the convenience of description, in the embodiment of the present application, the above-mentioned devices that provide the wireless communication function for the terminal 20 are collectively referred to as base stations.

Optionally, what is not shown in FIG. 1 is that the above-mentioned network architecture also includes other network devices, such as: a central control node (Central Network Control, CNC), an access and mobility management function (Access and Mobility Management Function, AMF ) device, session management function (Session Management Function, SMF) or user plane function (User Plane Function, UPF) device, etc.

The "5G NR system" in the embodiments of the present disclosure may also be called a 5G system or an NR system, but those skilled in the art can understand its meaning. The technical solution described in the embodiments of the present disclosure can be applied to the 5G NR system, and can also be applied to the subsequent evolution system of the 5G NR system.

Before introducing the schemes shown in the subsequent embodiments of the present application, several terms and concepts involved in the present application are firstly introduced.

1) Dual-Connectivity (DC)

DC is an important technology introduced by the 3rd Generation Partnership Project (3GPP) organization. Through dual connectivity technology, Long Term Evolution (LTE) macro stations and small stations can use the non-ideal backhaul (non-ideal backhaul) X2 interface to achieve carrier aggregation, thereby providing users with higher rates and utilizing macro /Micro-networking improves spectrum efficiency and load balancing. A terminal device that supports dual connections can connect to two base stations at the same time, increasing the throughput of a single user.

During the deployment of the 5G network, the 5G cell can be used as a macro coverage independent network, or as a small cell to enhance the coverage and capacity of the Long Term Evolution (LTE) network. No matter which networking method is adopted, dual connectivity technology can be used to realize the interconnection of LTE-5G systems, thereby improving the utilization rate of wireless resources of the entire mobile network system, reducing the delay of system switching, and improving user and system performance. 3GPP defines the dual connectivity technology of LTE and 5G on the basis of LTE dual connectivity technology. LTE-5G dual connectivity is a key technology for operators to realize LTE and 5G converged networking and flexible deployment scenarios. In the early stage of 5G, it can be quickly deployed based on the existing LTE core network. In the later stage, the joint networking of LTE and 5G can be used to achieve comprehensive network coverage, improve the utilization of wireless resources in the entire network system, reduce system switching delays, and improve user experience. and system performance.

In order to realize 5G network deployment and commercial application as soon as possible, 3GPP first completed the first 5G version, LTE-NR Dual Connectivity (EN-DC), before the end of December 2017. Here LTE serves as the master node (Master Node, MN), and NR serves as the secondary node (Secondary Node, SN).

Compared with LTE DC, the main key technical points of EN-DC mainly include: control plane, user plane, security, radio link failure (Radio Link Failure, RLF), system broadcast reception and radio resource management (Radio Resource Management, RRM) coordination and UE capability coordination, etc.

On the control plane, there are Radio Resource Control (Radio Resource Control, RRC) entities on both the MN and SN sides, and both can generate RRC Protocol Data Units (Protocol Data Unit, PDU). However, there is only one RRC state machine at the same time and it is based on the MN side.

The signaling bearer in LTE includes Signaling Radio Bearer (Signaling Radio Bearer, SRB) 0, SRB1, SRB2; EN-DC further supports SRB3 on this basis. The SRB3 is used to transmit the RRC signaling between the SN and the UE, and the generation of the signaling content carried by the signaling does not need to negotiate resources and UE capabilities with the MN. At the same time, in order to improve the reliability of SRB1 and SRB2, EN-DC supports split (split) SRB1 and split SRB2, that is, the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) PDU corresponding to the RRC message generated by the MN is repeatedly transmitted on the SN side One copy guarantees its high reliability.

The NR system stipulates that when the SCG connection fails, the terminal device will not trigger the reconstruction process, but will report the SCG connection failure report through the MCG.

2) Conditional switching

Conditional switching includes two scenarios:

Scenario 1: The conditional primary cell (Primary Cell, PCell) changes, and the handover configuration message sent by the source PCell to the terminal device also includes configuration information of at least one conditional handover target PCell cell and conditional handover condition configuration information of the corresponding conditional handover target PCell cell; After the conditional handover is successfully executed, that is, after the terminal device successfully accesses a conditional handover target PCell, the terminal device will delete all previously saved configuration information of the conditional handover target PCell and the conditional handover condition configuration of the corresponding conditional handover target PCell information.

Scenario 2: Conditional Primary Secondary Cell (PSCell) addition (subsequent in this article can be referred to as conditional addition) or conditional PSCell modification (subsequent in this article can be referred to as conditional modification), PCell or PSCell sends switching configuration to terminal equipment The message also includes configuration information of at least one target PSCell cell with condition addition or condition modification and conditional handover condition configuration information of the target PSCell cell with corresponding condition addition or condition modification; After the conditional handover target PSCell, the terminal device will delete all previously saved configuration information of the conditional handover target PSCell and conditional handover condition configuration information of the corresponding conditional handover target PSCell.

In the above scheme, once the terminal device fails to connect to SCG, the terminal device needs to suspend all SCG-related configurations (disconnection with SCG), and send an SCG connection failure report to MCG, that is: once the terminal device fails to connect to SCG, the SCG connection If it is completely disconnected, whether the SCG connection can be restored depends on the network implementation behavior after the MCG receives the SCG connection failure report from the terminal device, for example: MCG triggers the SCG release process to return the terminal device to the single connection state; or MCG triggers the reconfiguration process A new SCG cell is configured for the terminal device, and the terminal device attempts to restore the SCG connection based on the newly configured SCG cell.

The behavior of the terminal device after the above-mentioned SCG connection failure depends too much on the implementation of the MCG network. Even if the SCG connection is restored through the MCG reconfiguration process, it will take a long time and the signaling overhead of the reconfiguration process will be large, which is not conducive to the rapid operation of the terminal device. Restoring the DC high-speed state is also not conducive to power saving of terminal equipment. Especially for conditional PSCell addition or conditional PSCell modification scenarios, relying on MCG reconfiguration means that the configuration information of multiple target PSCells stored by the terminal device before is abandoned and may even be overwritten by the new SCG configuration under the control of the MCG, resulting in inappropriate The necessary reconfiguration process, and the reconfiguration process brings additional delay and overhead issues, affecting user experience.

Please refer to FIG. 2 , which shows a flow chart of a method for establishing a connection provided by an embodiment of the present application. The method can be executed by a terminal device, wherein the terminal device mentioned above can be a terminal in the network architecture shown in FIG. 1 . The method may include the following steps:

Step 201, when the terminal device is in the dual connection state and the secondary cell group SCG connection fails, restore or re-establish the secondary cell group SCG connection through the first cell; the first cell is that the terminal device has stored corresponding target configuration information, and satisfy the first condition.

In a possible implementation manner, the above-mentioned first cell may be at least one of the primary cell, the secondary cell, the primary and secondary cell connected to the terminal device, and the cell in which the terminal device stores cell configuration information before the SCG connection fails. .

To sum up, in the solution shown in the embodiment of the present application, when the terminal device is in the dual connection state and the SCG connection fails, the terminal device can autonomously select from the cells that have stored the corresponding target configuration information to meet the first condition The cell restores the SCG connection or re-establishes the SCG connection without waiting for the MCG to trigger the reconfiguration process, which reduces unnecessary reconfiguration processes, reduces the additional delay and signaling overhead caused by the reconfiguration process, and improves network transmission. efficiency and improve the user experience.

Optionally, when the secondary cell group SCG connection of the terminal device fails, the terminal device may generate SCG connection failure report information, and in some cases, the terminal device needs to report the SCG connection failure report information.

Please refer to FIG. 3 , which shows a flowchart of a method for establishing a connection provided by an embodiment of the present application. The method can be executed by a network-side device, wherein the above-mentioned network-side device can be the network architecture shown in FIG. 1 base station or other network equipment. The method may include the following steps:

Step 301, receiving the SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in the dual connection state and the SCG connection fails, and is reported according to the result of the SCG connection recovery or reconstruction; the SCG connection recovery or reconstruction process is It is performed by the first cell, where the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

To sum up, in the solution shown in the embodiment of the present application, when the terminal device is in the dual connection state and the SCG connection fails, the terminal device can autonomously select from the cells that have stored the corresponding target configuration information to meet the first condition The cell restores the SCG connection or re-establishes the SCG connection, and reports the SCG connection failure report information according to the SCG connection recovery or re-establishment; in the above process, the terminal device does not need to wait for the MCG to trigger the reconfiguration process, and the network side device can also know The recovery or re-establishment of the SCG connection on the terminal device side reduces unnecessary reconfiguration processes, reduces additional time delay and signaling overhead caused by the reconfiguration process, improves network transmission efficiency, and improves user experience.

Please refer to FIG. 4 , which shows a flow chart of a method for establishing a connection provided by an embodiment of the present application. The method can be executed by a terminal device, wherein the terminal device mentioned above can be a terminal in the network architecture shown in FIG. 1 . The method may include the following steps:

Step 401, when the terminal device is in the dual connectivity state and the SCG connection fails, the terminal device restores or reestablishes the SCG connection through the first cell.

When the terminal device is in the dual connectivity state and fails to connect to the secondary cell group SCG, the terminal device selects the first cell that meets the first condition from the cells that have stored the corresponding target configuration information.

Optionally, when the terminal device is in the dual connection state and the secondary cell group SCG connection fails, the terminal device can obtain the primary cell, secondary cell, primary and secondary cell corresponding to the previous SCG, and the cell configuration information stored in the terminal device. Among the cells, a first cell that satisfies the first condition is selected, and the secondary cell group SCG connection is restored or reestablished through the first cell.

In this embodiment of the present application, when the terminal device fails to connect to the SCG, if the terminal device can find a first cell that meets the first condition, the terminal device may try to re-establish or restore the SCG connection through the first cell.

In a possible implementation manner, when the terminal device is in the dual connectivity state and the SCG connection fails, restoring or reestablishing the SCG connection through the first cell includes:

When the terminal device is in the dual connection state and the SCG connection fails, start the timer;

Before the timer expires, the SCG connection is restored or reestablished through the first cell.

In a possible implementation manner, before the timer expires, restoring or reestablishing the SCG connection through the first cell includes:

Before the timer expires, the step of selecting the first cell to restore or re-establish the SCG connection is performed once;

Or, before the timer expires, and the number of failures to restore or re-establish the SCG connection during the running of the timer is less than or equal to the first number threshold, select the first cell to restore or re-establish the SCG connection.

In a possible implementation manner, starting the timer includes:

When the first SCG connection failure after the terminal device successfully receives the first reconfiguration message each time, start the timer; the first reconfiguration message includes configuration information of the target PSCell of the CPA or CPC;

Or, when the first SCG connection failure after the terminal device successfully receives the second reconfiguration message each time, start the timer; the second reconfiguration message includes configuration information for adding PSCell cells or modifying PSCell cells;

Or, when the first SCG connection fails after the terminal device successfully receives the third reconfiguration message each time, start the timer;

Or, start a timer when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time;

Or, whenever the terminal device fails to connect to the SCG and the timer is not running (or the timer is not started), start the timer;

Alternatively, the timer is started whenever the terminal device fails to connect to the SCG and the terminal device stores configuration information of at least one SCG cell, and the timer is not running.

Optionally, on the basis of the above timer start conditions, it may be necessary to further determine whether the first indication information enables the function of triggering SCG connection re-establishment or recovery, wherein the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection re-establishment or The restored function (see the follow-up introduction for the specific meaning).

Exemplarily, the above-mentioned timer starting condition is: whenever the terminal device fails to connect to the SCG and the first indication information indicates that the function of triggering SCG connection re-establishment or recovery is enabled, and the timer is not running, the terminal device starts the timer;

For another example, whenever the terminal device fails to connect to the SCG and the terminal device stores configuration information of at least one SCG cell, and the first indication information indicates that the function of triggering SCG connection re-establishment or recovery is enabled, and the timer is not running, the terminal device starts timer.

That is to say, when the first indication information needs to be further judged, if the first indication information indicates that the function of triggering SCG connection reestablishment or recovery is not enabled, the terminal device may not start the timer even if the aforementioned timer start condition is met.

In another possible implementation manner, when the terminal device is in the dual connectivity state and the SCG connection fails, restoring or reestablishing the SCG connection through the first cell includes:

When the terminal device is in the dual connectivity state and the SCG connection fails, and the number of failures to restore or re-establish the SCG connection is less than or equal to the second threshold, select the first cell to restore or re-establish the SCG connection.

In this embodiment of the present application, the process for the terminal device to restore or re-establish the SCG connection through the first cell may have at least one of the following implementations:

Implementation method 1: When the terminal device fails to connect to the SCG, start or restart a timer T1. Before the timer T1 expires, if the terminal device can find a first cell that meets the first condition, the terminal device can try to pass the first cell. A cell re-establishes or restores the SCG connection.

In one implementation mode, during the running of the timer T1, the terminal device attempts an SCG connection recovery or SCG re-establishment process by default, and a failure of the SCG connection recovery or SCG re-establishment process attempted during the running of the timer T1 means that the SCG connection fails, That is: the second attempt to restore or re-establish the SCG connection is not allowed; or, in another implementation mode, during the running of the timer T1, the terminal device can try any number of SCG connection recovery or SCG re-establishment processes by default (each All cells selected once need to meet the first condition), until the SCG connection is successfully re-established or restored through an SCG cell, or until the timer T1 times out.

Implementation method 2: When the terminal device fails to connect to the SCG, start or restart a timer T1. Before the timer T1 expires, if the terminal device can find a first cell that meets the first condition, the terminal device can try to pass the second cell. A cell re-establishes or restores the SCG connection. At the same time, during the running of timer T1, the terminal device can try M times of SCG connection recovery or SCG re-establishment process (the selected cell needs to meet the first condition each time), until it passes an SCG cell. Until the SCG connection is successfully re-established or restored, or until M times of SCG connection restoration or SCG re-establishment are attempted, or until the timer T1 times out.

Implementation method 3: After the terminal device fails to connect to the SCG, if the terminal device can find a first cell that satisfies the first condition, the terminal device can try to re-establish or restore the SCG connection through the first cell, and the terminal device The device can attempt at most M times of SCG connection recovery or SCG re-establishment process (each selected cell needs to meet the first condition), until the SCG connection is successfully re-established or restored through an SCG cell, or until M times of SCG connection are tried recovery or SCG re-establishment process.

Optionally, the condition for starting or restarting the timer T1 may include: each time the terminal device successfully receives the configuration information of the target PSCell cell containing at least one conditional addition (Conditional PSCell Addition, CPA) or conditional modification (Conditional PSCell Change, CPC) When the first SCG connection fails after the reconfiguration message, start or restart the timer T1; or, each time the terminal device successfully receives the reconfiguration message containing the PSCell cell addition or PSCell cell modification, the first SCG When the connection fails, start or restart the timer T1; or, each time the terminal device successfully receives the reconfiguration message when the first SCG connection fails, start or restart the timer T1; or, each time the terminal device successfully connects When the SCG connection fails for the first time after entering an SCG cell, start or restart the timer T1; or, whenever the terminal device fails to connect to the SCG and the timer is not running, start or restart the timer T1; or, whenever the terminal device When an SCG connection failure occurs and the terminal device stores configuration information of at least one SCG cell and the timer is not running, start or restart the timer T1.

Among them, timer T1 or parameter M can be configured in any of the following ways:

Default mode (for example, specified in the protocol), system broadcast message mode (for example, configured by the network side to the terminal device through a system broadcast message), or dedicated signaling mode (for example, configured by the network side to the terminal device through RRC signaling).

In a possible implementation manner, the target configuration information includes at least one of the following information:

Conditionally add the configuration information of the target primary and secondary cell PSCell of CPA;

Conditionally modify the configuration information of the target PSCell of the CPC;

Conditionally add the conditional handover trigger condition configuration information associated with the target PSCell of the CPA;

And, conditionally modify the conditional handover trigger condition configuration information associated with the target PSCell of the CPC.

In this embodiment of the application, the preconditions for fast recovery or re-establishment of the SCG connection may include: the terminal device has stored configuration information of at least one CPA or CPC target PSCell cell and corresponding condition addition or condition modification when the SCG connection failure occurs The conditional handover trigger condition configuration information associated with the target PSCell.

That is to say, if there is no above precondition, the terminal device may generate an SCG failure report and report the SCG failure report to the MCG when SCG connection failure occurs.

Exemplarily, the configuration information of the target PSCell may include at least one of the following:

The physical layer configuration that the terminal should use in the target PSCell, the MAC layer configuration that the terminal should use in the target PSCell, the RLC layer configuration that the terminal should use in the target PSCell, the DRB-related configuration that the terminal should use in the target PSCell, and the cell Supported frequency bands and bandwidth related configurations as well as random access configurations.

Exemplarily, the conditional handover event type corresponding to the conditional handover trigger condition configuration information associated with the target PSCell cell may include any of the following:

Condition A3 event: the target switching cell measurement result is higher than the current PCell/PSCell cell measurement result of the terminal device by a first threshold;

Condition A4 event: the measurement result of the target handover cell is higher than a second threshold;

Condition A5 event: the measurement result of the current PCell/PSCell cell of the terminal device is lower than a third threshold and the measurement result of the target handover cell is higher than a fourth threshold;

Condition D1 event: the distance between the terminal device and the location reference point 1 is greater than a fifth threshold and the distance between the terminal device and the location reference point 2 is smaller than a sixth threshold;

Condition T1 event: The local time of the terminal device exceeds the configured time 1 but does not exceed the configured time 2.

The first threshold, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold, time 1 and time 2 can be configured to terminal devices by the network side through system broadcast messages or dedicated signaling.

Optionally, there may be two configuration formats for moment 2:

The first one is directly given in UTC time, such as year, month, day, hour, minute and second: 2021.11.25 17:43:05;

The second type is indirectly given by time 1, time 2 = time 1 + fixed duration, for example: time 2 is the time corresponding to 20 seconds after time 1, and the configuration format of time 2 is not limited in this application.

In this embodiment of the application, if the conditional handover trigger condition configuration information associated with a target PSCell with condition addition or condition modification includes at least two trigger event configuration information, the condition associated with the target PSCell cell with corresponding condition addition or condition modification The meaning of the handover trigger condition being met may refer to:

Only when the events corresponding to at least two trigger event configuration information are triggered, it is considered that the conditional handover triggering condition associated with the target PSCell cell corresponding to the condition addition or condition modification is met; or,

When at least one of the events corresponding to the at least two trigger event configuration information is triggered, it is considered that the conditional handover trigger condition associated with the target PSCell corresponding to the condition addition or condition modification is met.

Wherein, the embodiment of the present application does not limit the meaning of the condition switching trigger condition being satisfied.

In a possible implementation manner, the above-mentioned first condition includes: at least one of a cell selection condition, a first measurement event, and a handover condition in the conditional handover trigger condition configuration information.

Exemplarily, the above conditional handover triggering condition configuration information is the conditional handover triggering condition configuration associated with the target PSCell cell configuration corresponding to condition addition or condition modification stored in the terminal device.

In a possible implementation manner, the first measurement event includes at least one of the following events:

The measurement result of the first cell is greater than or equal to the first measurement result threshold;

The measurement result of the first cell is greater than the measurement result of the primary cell, and the difference between the measurement result of the first cell and the measurement result of the primary cell is greater than or equal to an offset;

The measurement result of the first cell is greater than or equal to the second measurement result threshold, and the measurement result of the primary cell is less than or equal to the third measurement result threshold;

The distance between the terminal device and the first cell is less than or equal to a first distance threshold;

The distance between the terminal device and the first cell is less than or equal to the second distance threshold, and the distance between the terminal device and the primary cell is greater than or equal to the third distance threshold.

Wherein, the above-mentioned first measurement event can be configured in at least one of the following ways:

Preset mode (for example, the protocol specifies a default value), system broadcast message mode or dedicated signaling mode.

In this embodiment of the application, the above-mentioned meaning of meeting the first condition may include any of the following:

Satisfied that the terminal device stores the condition for selecting a cell, the PSCell cell adds configuration information or stores the condition for selecting a cell, and the PSCell cell modifies configuration information and meets the cell selection condition;

Satisfied that the terminal device stores the condition of the selected cell PSCell cell addition configuration information or stores the condition of the selected cell PSCell cell modification configuration information and at the same time satisfies the corresponding selected condition addition or condition modification target PSCell cell associated condition handover trigger condition configuration information switching condition in

It is satisfied that the terminal device stores the condition of selecting the cell, PSCell cell addition configuration information or stores the condition of selecting the cell, PSCell cell modification configuration information, and satisfies the first measurement event at the same time.

In an exemplary solution of an embodiment of the present application, the first measurement event may include any one of the following events:

Event 1: the measurement result of the cell is greater than or equal to the seventh threshold;

Event 2: The measurement result of the cell is higher than that of the PCell by an offset;

Event 3: the measurement result of the cell is higher than or equal to the eighth threshold, but the measurement result of the PCell is lower than or equal to the ninth threshold;

Event 4: The distance between the terminal device and the cell is less than or equal to the tenth threshold;

Event 5: the distance between the terminal device and the cell is less than or equal to the tenth threshold and the distance between the terminal device and the PCell is greater than or equal to the eleventh threshold;

Event 6: any combination of event 4 or event 5 and events 1 to 3.

Exemplarily, if the satisfaction condition of the combination event is that at least one single event (the above-mentioned events 1 to 5 can be referred to as a single event) is satisfied, then the combination event is considered to be satisfied; or, when all the single events contained in the combination event are satisfied , then it is considered that the combined event satisfies, which is not limited in this application.

Step 402, optionally, when the terminal device is in the dual connection state and SCG connection fails, generate SCG connection failure report information.

Optionally, the meaning of the cell selection condition can be as follows:

The cell selection criterion is satisfied when the following conditions are met:

S _rxlev > 0, and, S _qual >0;

S _rxlev = Q _rxlevmeas - (Q _rxlevmin + Q _{rxlevminoffset} ) - P _compensation - Q _offsettemp ;

S _qual = Q _qualmeas - (Q _qualmin + Q _{qualminoffset} ) - Q _offsettemp ;

Among them, the meanings of the above symbols can be as follows:

S _rxlev : cell selection reception level value;

S _qual : cell selection quality value;

Q _offsettemp : the offset temporarily applied to the cell;

Q _rxlevmeas : The measured cell receiving level value; it can also be Reference Signal Receiving Power (RSRP);

Q _qualmeas : measured cell selection quality value; it can also be Reference Signal Receiving Quality (RSRQ);

Q _rxlevmin : Minimum reception level required in the cell. If the UE supports the supplementary uplink (Supplementary Uplink, SUL) frequency of this cell, then obtain Q _rxlevmin in qR _xLevMinSUL of SIB1, SIB2 and SIB4 (if present), in addition, if the Q _{rxlevminoffsetcellSUL} of the relevant cell exists in SIB3 and SIB4, This cell specific offset is then added to the corresponding Q _rxlevmin to achieve the required minimum receive level in the associated cell. Otherwise, Q _rxlevmin is obtained from qR _xLevMin in SIB1, SIB2, and SIB4; moreover, if Q _{RXLEVMINOVSETCELL} is present in SIB3 and SIB4 of the relevant cell, this cell-specific offset is added to the corresponding Q _rxlevmin to achieve correlation Minimum reception level required in a cell.

Q _qualmin : The minimum quality level required for the cell. Furthermore, if a Q _{qualminoffsetcell} is signaled to the relevant cell, this cell-specific offset is added to achieve the required minimum quality level in the relevant cell.

Q _{rxlevminoffset} : Offset of the signal Q _rxlevmin considered in the evaluation of S _rxlev as a result of periodic searches for higher priority PLMNs during normal camping in a Visited Public Land Mobile Network (VPLMN).

Q _{qualminoffset} : Offset of the signal Q _qualmin considered in the Q _qual evaluation as a result of periodic searches for higher priority PLMNs during normal camping in a Visited Public Land Mobile Network (VPLMN).

P _compensation : For FR1, if the UE supports additional P _max in NR NS P _maxList , it supports additional P _max in SIB1, SIB2 and SIB4 (if present):

max(P _EMAX1 –P _PowerClass ,0)–(min(P _EMAX2 ,P _PowerClass )–min(P _EMAX1 ,P _PowerClass ));

Otherwise, max(P _EMAX1 -P _PowerClass , 0).

P _EMAX1 , P _EMAX2 : when transmitting on the uplink of the cell of P _EMAX , the maximum transmit power level that the UE can use. If the UE supports the SUL frequency of the current cell, _PEMAX1 and _PEMAX2 are obtained from the p-Max of the SUL in SIB1 and the NR NS P _maxList of the SUL in SIB1, SIB2, and SIB4; otherwise, _PEMAX1 and _PEMAX2 are obtained from the SUL of SIB1 , p-Max and NR NS PmaxList in SIB2 and SIB4 for normal uplink transmission.

P _PowerClass : Determined according to the UE power class, the maximum RF output power of the UE.

Among them, the signal values Q _{rxlevminoffset} and Q _qalminoffset are only applied in case of evaluation of cell selection due to periodic search for a higher priority PLMN while camping normally in a VPLMN. During this periodic search for a higher priority PLMN, the UE may check the cell's selection criteria using parameter values stored from different cells of the higher priority PLMN.

Step 403, optionally, process the SCG connection failure report information according to the result of SCG connection recovery or re-establishment.

In a possible implementation manner, the SCG connection failure report information is processed according to the result of the SCG connection recovery or re-establishment, including:

When the timer expires, the terminal device reports SCG connection failure report information to the main cell group MCG;

When the terminal device fails to connect to the SCG again during the running of the timer, the terminal device reports the SCG connection failure report information to the MCG;

When the number of SCG connection failures of the terminal device during the running of the timer reaches the third threshold, the terminal device reports SCG connection failure report information to the MCG;

When the timer stops, the terminal device reports the SCG connection failure report information to the MCG;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device deletes the previously stored SCG connection failure report information;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the successfully accessed first cell;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the MCG;

Alternatively, when the number of SCG connection failures that occur again reaches the fourth threshold, the terminal device reports SCG connection failure report information to the MCG.

That is to say, in this embodiment of the application, when the terminal device is in the dual connection state and the SCG connection fails, the SCG connection failure report information can be generated, and the terminal device performs the SCG connection restoration or re-establishment process through the first cell In a case where the SCG connection is restored or reestablished, the SCG connection failure report information may also be reported.

Optionally, when the terminal device fails to connect to the SCG, it also includes recording the SCG failure report information when the SCG failure occurs, and the processing behavior of the SCG failure report information may be any of the following:

When the timer T1 expires, the terminal device is triggered to report SCG failure report information to the MCG;

An SCG failure occurs again during the running of timer T1, triggering the terminal device to report SCG failure report information to the MCG;

During the operation of timer T1, SCG failure occurs again and reaches the maximum number M, triggering the terminal device to report SCG failure report information to MCG;

When the timer T1 stops, the terminal device is triggered to report SCG failure report information to the MCG;

If the terminal device successfully re-establishes or restores the SCG connection through the selected first cell, delete the stored SCG failure report information;

If the terminal device successfully re-establishes or restores the SCG connection through the selected first cell, the terminal device reports the previously stored SCG failure report information to the successfully accessed first cell;

If the terminal device successfully re-establishes or restores the SCG connection through the selected first cell, the terminal device reports the previously stored SCG failure report information to the MCG;

If the number of SCG connection failures on the terminal device reaches M times again, the terminal device reports SCG connection failure report information to the MCG.

In a possible implementation manner, the reasons for the timeout of the timer include:

During the operation of the timer, no first cell meeting the first condition is selected;

Alternatively, the first cell meeting the first condition is selected during the running of the timer, and the first cell meeting the first condition is not successfully accessed during the running of the timer.

Optionally, when the timer T1 expires, the behavior of the terminal device may also include: deleting all stored configuration information of at least one target PSCell with condition addition or condition modification and conditions associated with the target PSCell corresponding to condition addition or condition modification Handover trigger condition configuration information; or delete all stored configuration information related to conditional handover, wherein conditional handover includes any one of conditional PCell change (also called Conditional Handover, CHO), CPC or CPA.

Optionally, the above deleted information may be configuration information related to the SCG.

In a possible implementation manner, when the timer T1 expires, the terminal device may delete the stored configuration information of at least one conditionally added or conditionally modified target PSCell related to the SCG, and delete the SCG-related, Conditional handover trigger condition configuration information associated with the target PSCell corresponding to the condition addition or condition modification.

Alternatively, when the timer T1 expires, the terminal device may delete all stored configuration information related to the SCG that is added to or modified by the corresponding conditional PSCell.

In a possible implementation manner, the reasons for stopping the timer include:

Select a cell that meets the first condition during the running of the timer, and successfully complete the random access process with the first cell or successfully complete uplink synchronization with the first cell before the timer expires;

Select a cell that meets the first condition during the running of the timer, and successfully send a reconfiguration complete message to the MCG or the first cell before the timer expires;

An SCG connection failure occurs again during the running of the timer;

During the operation of the timer, the number of SCG connection failures reaches the fifth threshold;

During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to the condition addition or condition modification are deleted;

During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to condition addition or condition modification becomes invalid;

During the running of the timer, a synchronous reconfiguration message for changing the MCG sent by the network device is received;

During the running of the timer, trigger MCG radio link failure;

During the running of the timer, a timely handover configuration message sent by the network device is received; the timely handover configuration message is used to control the terminal device to immediately trigger an access process with the target PCell or target PSCell.

In the solution shown in the embodiment of this application, the trigger condition for stopping the timer T1 may include any of the following:

The terminal device finds the first cell that meets the preset condition 1 during the running of the timer T1 and successfully completes the random access process with the first cell or successfully completes uplink synchronization with the first cell before the timer T1 expires;

The terminal device finds the first cell meeting the preset condition 1 during the running of the timer T1 and successfully sends a reconfiguration complete message to the MCG or the first cell before the timer T1 expires;

The terminal device fails SCG again during the running of timer T1;

The terminal device re-occurs SCG failures up to the maximum number M during the running of timer T1;

During the operation of the timer T1, the terminal device deletes all stored configuration information of at least one target PSCell with condition addition or condition modification and conditional handover trigger condition configuration information associated with the target PSCell with corresponding condition addition or condition modification;

During the operation of the timer T1, the terminal device determines that all the configuration information of at least one condition-added or condition-modified target PSCell and the conditional handover trigger condition configuration information associated with the corresponding condition-added or condition-modified target PSCell are invalid;

The terminal device receives a synchronous reconfiguration message for changing the MCG sent by the network device during the running of the timer T1;

The terminal device fails to trigger the MCG wireless link during the running of timer T1;

The terminal device receives a timely switching configuration message sent by the network device during the running of the timer T1;

The above timely handover configuration message is relative to the conditional handover configuration message. After the terminal device successfully receives the timely handover configuration message sent by the network device, it will immediately trigger the access process with the target PCell or target PSCell.

In a possible implementation manner, the SCG connection failure reasons in the SCG connection failure report information include:

Continuous SCG connection failures, conditional SCG handover failures, or failure to select a cell that satisfies the first condition initiates an SCG connection reestablishment or recovery process.

In this embodiment of the present application, the reasons for the SCG connection failure may include: continuous SCG failures, conditional SCG handover failures, or no SCG cells meeting the conditions to initiate SCG connection re-establishment or recovery process.

Optionally, the reasons for the SCG connection failure may also include any of the following:

The T310 timer for judging that the synchronization is abnormal on the SCG side expires, the random access process on the SCG side fails (for example, the number of random access attempts reaches the specified maximum), and the radio link control (Radio Link Control, RLC) retransmission on the SCG side reaches the specified The maximum number of times, the SCG reconfiguration process fails, the SCG synchronous reconfiguration process fails, the SRB3 integrity protection check fails on the SCG side, the LBT (Listen Before Talk, listen before talk) process fails on the SCG side, the SCG beam failure recovery process fails, and the SCG The T312 timer used to quickly determine the connection failure on the SCG side expires, and the backhaul link on the SCG side fails.

In a possible implementation manner, the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs.

Wherein, the identification information of the cell where the SCG failure occurs is represented by a Cell Global Identifier (CGI), a frequency point + a Physical Cell Identifier (PCI), or a serving cell identity (servCellIndex).

The logical identification information of the cell where the SCG failure occurs is a logical identification associated with the target PSCell cell for each condition added or condition modified during the conditional handover configuration process, and the meaning of the logical identification is illustrated by Table 1 as an example:

Table 1

As shown in Table 1, a logical identification information is associated with a conditional handover target PSCell configuration and the target PSCell conditional handover trigger condition configuration. The main function of the logical identification information is to identify a CHO (Conditional HO), CPC or CPA corresponding configuration. Exemplarily, the logical identifier corresponds to the standard CondReconfigId parameter.

In a possible implementation, when the number of SCG connection failures is at least two,

According to the result of SCG connection recovery or reconstruction, process the SCG connection failure report information, including:

Report the SCG connection failure report information of the latest SCG connection failure;

Or, report SCG connection failure report information of at least two SCG connection failures.

In a possible implementation manner, in the case of reporting the SCG connection failure report information of the latest SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed SCG connection at least twice.

In the solution shown in the embodiment of this application, if the terminal device has multiple SCG failure events before reporting the SCG report to the network device (for example, multiple SCG failures only include SCG events that occurred during the running of timer T1 or, multiple SCG failures (including SCG failures during the running of timer T1 and SCG failures that trigger timer T1 to start), the terminal device reports the SCG report behavior in any of the following ways:

Behavior 1: Report the latest SCG failure record, and the SCG failure report recorded later always covers the SCG failure report recorded earlier, that is, the terminal device only reports the latest SCG failure report.

The content of the SCG failure report under behavior mode 1 includes: the standard existing record content + the aforementioned enhanced part (that is, the identification information or logical identification information of the cell where the SCG connection failure occurred; and/or the reason information for the SCG connection failure; wherein, the SCG connection failure occurred The identification information or logical identification information of the failed cell is the identification information or logical identification information of the cell where the SCG failure occurred most recently).

Behavior 2: Record each SCG failure separately and report it together through the SCG failure report list. Each SCG failure report contained in the SCG failure report list includes the complete SCG failure report content.

SCG failure report content in behavior mode 2: standard existing record content + the aforementioned enhanced part (that is, the identification information or logical identification information of the cell where the SCG connection failure occurred; and/or the cause information of the SCG connection failure, where the SCG failure occurred The identification information or logical identification information of the cell is the identification information or logical identification information of the respective cells where the SCG failure actually occurs).

Behavior 2 Description: If the communication system stipulates the maximum number of SCG failure reports that can be recorded in the SCG failure report list, then use the cyclic coverage mode to record, for example: the communication system specifies the number of SCG failures that can be recorded in the SCG failure report list The maximum number of reports is 3, when the fourth SCG failure occurs, the SCG failure report content of the first SCG failure occurs, and when the fifth SCG failure occurs, the SCG failure report content of the second SCG failure occurs, in order By analogy, cyclic coverage recording is performed, that is, the number of SCG failure reports actually reported by the terminal device will not exceed the maximum number of SCG failure reports that can be recorded in the SCG failure report list specified by the communication system.

Among them, the maximum number of SCG failure reports that can be recorded in the SCG failure report list specified by the communication system is configured in any of the following ways:

Default mode (such as protocol regulation), system broadcast message mode or dedicated signaling mode.

Behavior 3: Report the latest SCG failure record, and the SCG failure report recorded later will overwrite the previous SCG failure report.

SCG failure report content in behavior mode 3: standard existing record content + the aforementioned enhanced part (that is, the identification information or logical identification information of the cell where the SCG connection failure occurred; and/or the cause information of the SCG connection failure, where the SCG failure occurred The identification information or logical identification information of the cell includes the identification information or logical identification information of the cell where the SCG failure occurred multiple times before).

In behavior 3, if the communication system stipulates the maximum number of SCG failure cell identification information or logical identification information that can be recorded in the SCG failure report, the cyclic coverage mode is used for recording, for example: the communication system specifies that the SCG failure report The maximum number of SCG failure cell identification information or logical identification information that can be recorded is 3, and when the fourth SCG failure occurs, the terminal device will only record the identification information or logical identification information of the last three SCG failure cells, and so on to cycle Coverage records, that is, the number of SCG failure cell identification information or logical identification information recorded in the SCG failure report actually reported by the terminal device will not exceed the number of SCG failure cell identification information or logical identification information that can be recorded in the SCG failure report as stipulated by the communication system. The maximum number of identification information.

Among them, the SCG failure cell identification information or the maximum number of logical identification information parameters that can be recorded in the SCG failure report specified by the communication system are configured in any of the following ways:

Default mode, system broadcast message mode or dedicated signaling mode.

Step 404, optionally, when successfully reestablishing or restoring the SCG connection through the selected first cell, report the identification information or logical identification information of the designated SCG cell to the MCG or the SCG where the connection is established; correspondingly, the network side device receives the designated Identification information or logical identification information of the SCG cell.

In a possible implementation manner, specifying the identification information or logical identification information of the SCG cell includes:

Identification information or logical identification information of the successfully accessed SCG cell;

Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before successfully accessing the SCG cell;

Or, the identification information or logical identification information of the successfully accessed SCG cell, and the identification information or logical identification information of at least one SCG cell whose SCG connection failed before the successful access to the SCG cell.

In the solution shown in the embodiment of this application, after the terminal device successfully re-establishes or restores the SCG connection through the selected first cell, the behavior of the terminal device also includes: reporting the preset SCG cell to the MCG or the connected SCG through dedicated signaling The identification information or logical identification information.

Exemplarily, the above-mentioned dedicated signaling is a reconfiguration complete message or a terminal device auxiliary information reporting message.

The meaning of the preset SCG cell identification information or logical identification information is any of the following:

Including identification information or logical identification information of the SCG cell that the terminal device successfully accesses;

Including identification information or logical identification information of at least one SCG cell where the SCG failed before the terminal device successfully accesses the SCG cell;

At the same time, it includes identification information or logical identification information of the SCG cell that the terminal device successfully accesses, and at least one SCG cell identification information or logical identification information that the terminal device successfully accesses the SCG cell.

In a possible implementation manner, the network side device may send first indication information to the terminal device; correspondingly, the terminal device may receive the first indication information sent by the network device, and the first indication information is used to indicate whether the terminal device enables the trigger The function of SCG connection reestablishment or recovery.

Optionally, before triggering the fast recovery or re-establishment of the SCG connection, the behavior of the terminal device further includes receiving a first configuration message sent by the network device, the first configuration message may include first indication information, and the above first indication information is used for Indicates whether the terminal device can trigger SCG connection fast recovery or re-establishment attempt behavior.

If the meaning of the first indication information is to allow the terminal device to trigger an SCG connection fast recovery or re-establishment attempt, the terminal device performs the above steps 401 to 404 .

If the meaning of the first indication information is that the terminal device is not allowed to trigger the SCG connection fast recovery or re-establishment attempt behavior, the terminal device performs the behavior according to the existing process, that is: when the SCG connection fails, the terminal device generates an SCG failure report and sends the SCG The failure report is reported to MCG, and the content of SCG failure report will not be enhanced in any way.

Wherein, the first configuration message is a system broadcast message or a dedicated signaling message.

Optionally, the dedicated signaling may be any one of radio resource control signaling, medium access control control element (MAC Control Element, MAC CE), and downlink control information (Downlink Control Information, DCI).

In a possible implementation, the terminal device may also send capability indication information to the network device, and correspondingly, the network side device receives the capability indication information sent by the terminal device; the capability indication information is used to indicate whether the terminal device supports SCG connection Rebuild or restore functionality.

To sum up, in the solution shown in the embodiment of the present application, when the terminal device is in the dual connection state and the SCG connection fails, the terminal device can autonomously select from the cells that have stored the corresponding target configuration information to meet the first condition The cell restores the SCG connection or re-establishes the SCG connection without waiting for the MCG to trigger the reconfiguration process, which reduces unnecessary reconfiguration processes, reduces the additional delay and signaling overhead caused by the reconfiguration process, and improves network transmission. efficiency and improve user experience.

Please refer to FIG. 5 , which shows a block diagram of an apparatus for establishing a connection provided by an embodiment of the present application. The connection establishment apparatus 500 can be used in a terminal device. As shown in Figure 5, the device may include:

A connection module 501, configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connection state and the SCG connection fails;

The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition.

In a possible implementation manner, the target configuration information includes at least one of the following information:

Conditionally add the configuration information of the target primary and secondary cell PSCell of CPA;

Conditionally modify the configuration information of the target PSCell of the CPC;

Conditionally add the conditional handover trigger condition configuration information associated with the target PSCell of the CPA;

And, conditionally modify the conditional handover trigger condition configuration information associated with the target PSCell of the CPC.

In a possible implementation manner, the first condition includes: at least one of a cell selection condition, a first measurement event, and a handover condition in conditional handover trigger condition configuration information.

Exemplarily, the conditional handover trigger condition configuration information is the conditional handover trigger condition configuration associated with the corresponding condition added or condition modified target PSCell cell configuration stored in the terminal device. .

In a possible implementation manner, the first measurement event includes at least one of the following events:

The measurement result of the first cell is greater than or equal to a first measurement result threshold;

The measurement result of the first cell is greater than the measurement result of the primary cell, and the difference between the measurement result of the first cell and the measurement result of the primary cell is greater than or equal to an offset;

The measurement result of the first cell is greater than or equal to a second measurement result threshold, and the measurement result of the primary cell is less than or equal to a third measurement result threshold;

The distance between the terminal device and the first cell is less than or equal to a first distance threshold;

The distance between the terminal device and the first cell is less than or equal to a second distance threshold, and the distance between the terminal device and the primary cell is greater than or equal to a third distance threshold.

In a possible implementation manner, the first measurement event is configured in at least one of the following manners:

Preset mode (for example, the protocol specifies a default value), system broadcast message mode or dedicated signaling mode.

In a possible implementation manner, the connection module is configured to:

When the terminal device is in a dual connection state and the SCG connection fails, start a timer;

Before the timer expires, the SCG connection is recovered or reestablished through the first cell.

In a possible implementation manner, the connection module is configured to:

Before the timer expires, the step of selecting the first cell to restore or re-establish the SCG connection is performed once;

Or, before the timer expires, and the number of failures to restore or re-establish the SCG connection during the running of the timer is less than or equal to the first number threshold, select the first cell to restore or re-establish the SCG connection.

In a possible implementation manner, the connection module is configured to:

When the first SCG connection failure after the terminal device successfully receives the first reconfiguration message each time, start the timer; the first reconfiguration message includes configuration information of the target PSCell of the CPA or CPC;

Or, when the first SCG connection failure after the terminal device successfully receives the second reconfiguration message each time, start a timer; the second reconfiguration message includes configuration information of PSCell cell addition or PSCell cell modification;

Or, when the first SCG connection fails after the terminal device successfully receives the third reconfiguration message each time, start a timer;

Or, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, start a timer;

Or, whenever the terminal device fails to connect to the SCG and the timer is not running, start the timer;

Alternatively, the timer is started whenever the terminal device fails to connect to the SCG and the terminal device stores configuration information of at least one SCG cell and the timer is not running.

In a possible implementation manner, the connection module is configured to: when the terminal device is in the dual connection state and the SCG connection fails, when the number of failures to restore or re-establish the SCG connection is less than or equal to the second threshold, Select the first cell to restore or re-establish the SCG connection.

In a possible implementation manner, the device further includes:

A report generating module, configured to generate SCG connection failure report information when the terminal device is in a dual connection state and the SCG connection fails;

The report processing module is configured to process the SCG connection failure report information according to the result of SCG connection recovery or re-establishment.

In a possible implementation manner, the report processing module is configured to:

When the timer expires, the terminal device reports the SCG connection failure report information to the main cell group MCG;

When the terminal device fails to connect to the SCG again during the operation of the timer, the terminal device reports SCG connection failure report information to the MCG;

When the number of SCG connection failures of the terminal device during the operation of the timer reaches a third threshold, the terminal device reports SCG connection failure report information to the MCG;

When the timer stops, the terminal device reports SCG connection failure report information to the MCG;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device deletes previously stored SCG connection failure report information;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the successfully accessed first cell;

When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the MCG;

Alternatively, when the number of SCG connection failures that occur again reaches a fourth threshold, the terminal device reports SCG connection failure report information to the MCG.

In a possible implementation manner, the reasons for the timeout of the timer include:

The first cell that meets the first condition is not selected during the running of the timer;

or, selecting the first cell satisfying the first condition during the running of the timer, and failing to access the first cell satisfying the first condition during the running of the timer .

In a possible implementation manner, the device further includes: a deletion module configured to,

When the timer expires, the terminal device deletes the stored configuration information of at least one conditionally added or conditionally modified target PSCell cell, and the conditional handover trigger condition configuration associated with the conditionally added or conditionally modified target PSCell cell information;

Or, when the timer expires, the terminal device deletes all stored configuration information related to conditional switching.

In a possible implementation manner, the reasons for stopping the timer include:

Selecting a cell that satisfies the first condition during the running of the timer, and successfully completing a random access procedure with the first cell or successfully completing uplink synchronization with the first cell before the timer expires ;

Selecting a cell satisfying the first condition during the running of the timer, and successfully sending a reconfiguration complete message to the MCG or the first cell before the timer expires;

An SCG connection failure occurs again during the operation of the timer;

During the operation of the timer, the number of SCG connection failures reaches the fifth threshold;

During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification is deleted, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to the condition addition or condition modification;

During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to condition addition or condition modification becomes invalid;

During the operation of the timer, a synchronous reconfiguration message for changing the MCG sent by the network device is received;

During the operation of the timer, trigger the failure of the MCG radio link;

During the running of the timer, a timely handover configuration message sent by the network device is received; the timely handover configuration message is used to control the terminal device to immediately trigger an access process with the target PCell or target PSCell.

In a possible implementation manner, the SCG connection failure reason in the SCG connection failure report information includes:

When continuous SCG connection failures occur, conditional SCG handover failures occur, or a cell that does not meet the first condition is selected, an SCG connection reestablishment or recovery process is initiated.

In a possible implementation manner, the SCG connection failure report information includes: identification information or logical identification information of a cell where the SCG connection failure occurs.

In a possible implementation, when the number of SCG connection failures is at least two,

said report processing module for,

Report the SCG connection failure report information of the latest SCG connection failure;

Or, report SCG connection failure report information of at least two SCG connection failures.

In a possible implementation manner, in the case of reporting the SCG connection failure report information of the latest SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed at least twice in SCG connection.

In a possible implementation manner, the device further includes:

The identification reporting module is configured to report the identification information or logical identification information of the designated SCG cell to the MCG or the SCG where the connection is established when the SCG connection is successfully reestablished or restored through the selected first cell.

In a possible implementation manner, the identification information or logical identification information of the specified SCG cell includes:

Identification information or logical identification information of the successfully accessed SCG cell;

Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before successfully accessing the SCG cell;

Or, the identification information or logical identification information of the successfully accessed SCG cell, and the identification information or logical identification information of at least one SCG cell whose SCG connection failed before the successful access to the SCG cell.

In a possible implementation manner, the device further includes:

The indication receiving module is configured to receive first indication information sent by the network device, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery.

In a possible implementation manner, the device further includes:

An indication sending module, configured to send capability indication information to the network device, where the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reestablishment or recovery.

To sum up, in the solution shown in the embodiment of the present application, when the terminal device is in the dual connection state and the SCG connection fails, the terminal device can automatically select from the cells that have stored the corresponding target configuration information and meet the first condition. The cell restores the SCG connection or re-establishes the SCG connection without waiting for the MCG to trigger the reconfiguration process, which reduces unnecessary reconfiguration processes, reduces the additional delay and signaling overhead caused by the reconfiguration process, and improves network transmission. efficiency and improve user experience.

Please refer to FIG. 6 , which shows a block diagram of an information receiving device provided by an embodiment of the present application. The information receiving apparatus 600 may be used in network side equipment. As shown in Figure 6, the device may include:

The receiving module 601 is configured to receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or re-establishment;

Wherein, the process of restoring or reestablishing the SCG connection is performed through the first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

In a possible implementation manner, the SCG connection failure report information includes: a reason for the SCG connection failure.

The SCG connection failure reasons in the SCG connection failure report information include:

When continuous SCG connection failures occur, conditional SCG handover failures occur, or a cell that does not meet the first condition is selected, an SCG connection reestablishment or recovery process is initiated.

In a possible implementation manner, the SCG connection failure report information includes: identification information or logical identification information of a cell where the SCG connection failure occurs.

In a possible implementation manner, the SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure;

Alternatively, the SCG connection failure report information includes SCG connection failure report information of at least two SCG connection failures.

In a possible implementation manner, when the SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed at least twice in SCG connection.

In a possible implementation manner, the receiving module 601 is further configured to receive a specified Identification information or logical identification information of the SCG cell.

In a possible implementation manner, the identification information or logical identification information of the specified SCG cell includes:

Identification information or logical identification information of the successfully accessed SCG cell;

Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before successfully accessing the SCG cell;

Or, the identification information or logical identification information of the successfully accessed SCG cell, and the identification information or logical identification information of at least one SCG cell whose SCG connection failed before the successful access to the SCG cell.

In a possible implementation manner, the device further includes:

A sending module, configured to send first indication information to the terminal device, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery.

In a possible implementation manner, the receiving module 601 is further configured to receive capability indication information sent by the terminal device, where the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reestablishment or recovery .

To sum up, in the solution shown in the embodiment of the present application, when the terminal device is in the dual connection state and the SCG connection fails, the terminal device can autonomously select from the cells that have stored the corresponding target configuration information to meet the first condition The cell restores the SCG connection or re-establishes the SCG connection, and reports the SCG connection failure report information according to the SCG connection recovery or re-establishment; in the above process, the terminal device does not need to wait for the MCG to trigger the reconfiguration process, and the network side device can also know When the SCG connection on the terminal device side is restored or reestablished, unnecessary reconfiguration processes are reduced, additional time delay and signaling overhead caused by the reconfiguration process are reduced, network transmission efficiency is improved, and user experience is improved.

It should be noted that when the device provided by the above embodiment realizes its functions, it only uses the division of the above-mentioned functional modules as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.

Regarding the apparatus in the foregoing embodiments, the specific manner in which each module executes operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

Please refer to FIG. 7 , which shows a schematic structural diagram of a computer device 700 provided by an embodiment of the present application. The computer device 700 may include: a processor 701 , a receiver 702 , a transmitter 703 , a memory 704 and a bus 707 .

The processor 701 includes one or more processing cores, and the processor 701 executes various functional applications and information processing by running software programs and modules.

The receiver 702 and the transmitter 703 can be realized as a communication component, and the communication component can be a communication chip. The communication chip can also be called a transceiver.

The memory 704 is connected to the processor 701 through a bus 707 .

The memory 704 may be used to store a computer program, and the processor 701 is used to execute the computer program, so as to implement various steps performed by the terminal device in the foregoing method embodiments.

In addition, the memory 704 can be realized by any type of volatile or non-volatile storage device or their combination, volatile or non-volatile storage devices include but not limited to: magnetic disk or optical disk, electrically erasable and programmable Read Only Memory, Erasable Programmable Read Only Memory, Static Anytime Access Memory, Read Only Memory, Magnetic Memory, Flash Memory, Programmable Read Only Memory.

The foregoing computer device may be implemented as the terminal device in each of the foregoing method embodiments.

In an exemplary embodiment, the computer device includes a processor, a memory, and a transceiver (the transceiver may include a receiver and a transmitter, the receiver is used to receive information, and the transmitter is used to send information);

When the above computer device is implemented as the terminal device in each of the above method embodiments,

The transceiver is configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connectivity state and the SCG connection fails;

The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition.

When the above-mentioned computer device is implemented as a terminal device in each of the above-mentioned method embodiments, the process performed by the transceiver and/or the processor can refer to the steps performed by the terminal device in the solution shown in FIG. 2 or FIG. 4 above, where No longer.

When the above computer device is implemented as the network side device in each of the above method embodiments,

The transceiver is configured to receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or re-establishment;

Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition.

When the above-mentioned computer device is implemented as the network-side device in each of the above-mentioned method embodiments, the process performed by the transceiver and/or the processor can refer to the steps performed by the network-side device in the solution shown in FIG. 3 or FIG. 4 above, I won't repeat them here.

The embodiment of the present application also provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is loaded and executed by a processor to implement the above-mentioned method shown in FIG. 2 or FIG. 4 , by Each step executed by the terminal device; or, the computer program is loaded and executed by a processor to implement each step executed by the network side device in the method shown in FIG. 3 or FIG. 4 above.

The present application also provides a computer program product or computer program, the computer program product or computer program comprising computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps performed by the terminal device in the method shown in FIG. 2 or FIG. 4 above; or , the processor executes the computer instructions, so that the computer device executes the various steps performed by the network side device in the method shown in FIG. 3 or FIG. 4 above.

The present application also provides a computer program, the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps performed by the terminal device in the method shown in FIG. 2 or FIG. 4 above; or , the processor executes the computer instructions, so that the computer device executes the various steps performed by the network side device in the method shown in FIG. 3 or FIG. 4 above.

The present application also provides a chip, the chip is used in a terminal device, and the chip can execute the various steps performed by the terminal device in the method shown in FIG. 2 or FIG. 4 above; Or in the method shown in FIG. 4 , various steps executed by the network side device.

Those skilled in the art should be aware that, in the foregoing one or more examples, the functions described in the embodiments of the present application may be implemented by hardware, software, firmware or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above are only exemplary embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims (66)

A method for establishing a connection, characterized in that the method is executed by a terminal device, and the method includes: When the terminal device is in the dual connectivity state and the secondary cell group SCG connection fails, restore or re-establish the secondary cell group SCG connection through the first cell; The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition. The method according to claim 1, wherein the target configuration information includes at least one of the following information: Conditionally add the configuration information of the target primary and secondary cell PSCell of CPA; Conditionally modify the configuration information of the target PSCell of the CPC; Conditionally add the conditional handover trigger condition configuration information associated with the target PSCell of the CPA; And, conditionally modify the conditional handover trigger condition configuration information associated with the target PSCell of the CPC. The method according to claim 1 or 2, wherein the first condition comprises: at least one of a cell selection condition, a first measurement event, and a handover condition in conditional handover trigger condition configuration information. The method according to claim 3, wherein the first measurement event comprises at least one of the following events: The measurement result of the first cell is greater than or equal to a first measurement result threshold; The measurement result of the first cell is greater than the measurement result of the primary cell, and the difference between the measurement result of the first cell and the measurement result of the primary cell is greater than or equal to an offset; The measurement result of the first cell is greater than or equal to a second measurement result threshold, and the measurement result of the primary cell is less than or equal to a third measurement result threshold; The distance between the terminal device and the first cell is less than or equal to a first distance threshold; The distance between the terminal device and the first cell is less than or equal to a second distance threshold, and the distance between the terminal device and the primary cell is greater than or equal to a third distance threshold. The method according to claim 3 or 4, wherein the first measurement event is configured in at least one of the following ways: Preset mode, system broadcast message mode or dedicated signaling mode. The method according to any one of claims 1 to 5, wherein when the terminal device is in a dual connection state and the SCG connection fails, restoring or reestablishing the SCG connection through the first cell includes: When the terminal device is in a dual connection state and the SCG connection fails, start a timer; Before the timer expires, the SCG connection is recovered or reestablished through the first cell. The method according to claim 6, wherein the restoring or reestablishing the SCG connection through the first cell before the timer expires comprises: Before the timer expires, the step of selecting the first cell to restore or re-establish the SCG connection is performed once; or, Before the timer expires, and the number of failures to restore or re-establish the SCG connection during the running of the timer is less than or equal to the first number threshold, select the first cell to restore or re-establish the SCG connection. The method according to claim 6, wherein said starting the timer comprises: When the first SCG connection failure after the terminal device successfully receives the first reconfiguration message each time, start the timer; the first reconfiguration message includes configuration information of the target PSCell of the CPA or CPC; Or, when the first SCG connection failure after the terminal device successfully receives the second reconfiguration message each time, start a timer; the second reconfiguration message includes configuration information of PSCell cell addition or PSCell cell modification; Or, when the first SCG connection fails after the terminal device successfully receives the third reconfiguration message each time, start a timer; Or, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, start a timer; Or, whenever the terminal device fails to connect to the SCG and the timer is not running, start the timer; Alternatively, the timer is started whenever the terminal device fails to connect to the SCG and the terminal device stores configuration information of at least one SCG cell and the timer is not running. The method according to any one of claims 1 to 5, wherein when the terminal device is in a dual connection state and the SCG connection fails, restoring or reestablishing the SCG connection through the first cell includes: When the terminal device is in the dual connection state and the SCG connection fails, and the number of failures to restore or re-establish the SCG connection is less than or equal to the second threshold, select the first cell to restore or re-establish the SCG connection. The method according to any one of claims 1 to 9, wherein the method further comprises: When the terminal device is in the dual connection state and the SCG connection fails, generate SCG connection failure report information; According to the result of SCG connection recovery or re-establishment, the SCG connection failure report information is processed. The method according to claim 10, wherein the processing of the SCG connection failure report information according to the result of SCG connection recovery or re-establishment includes: When the timer expires, the terminal device reports SCG connection failure report information to the main cell group MCG; When the terminal device fails to connect to the SCG again during the operation of the timer, the terminal device reports SCG connection failure report information to the MCG; When the number of SCG connection failures of the terminal device during the operation of the timer reaches a third threshold, the terminal device reports SCG connection failure report information to the MCG; When the timer stops, the terminal device reports SCG connection failure report information to the MCG; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device deletes previously stored SCG connection failure report information; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the successfully accessed first cell; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the MCG; Alternatively, when the number of SCG connection failures that occur again reaches a fourth threshold, the terminal device reports SCG connection failure report information to the MCG. The method according to claim 11, wherein the reasons for the timer overtime include: The first cell that meets the first condition is not selected during the running of the timer; or, selecting the first cell satisfying the first condition during the running of the timer, and failing to access the first cell satisfying the first condition during the running of the timer . The method according to claim 11 or 12, characterized in that the method further comprises: When the timer expires, the terminal device deletes the stored configuration information of at least one conditionally added or conditionally modified target PSCell cell, and the conditional handover trigger condition configuration associated with the conditionally added or conditionally modified target PSCell cell information; Or, when the timer expires, the terminal device deletes all stored configuration information related to conditional switching. The method according to claim 11, wherein the reasons for stopping the timer include: Selecting a cell that satisfies the first condition during the running of the timer, and successfully completing a random access procedure with the first cell or successfully completing uplink synchronization with the first cell before the timer expires ; Selecting a cell satisfying the first condition during the running of the timer, and successfully sending a reconfiguration complete message to the MCG or the first cell before the timer expires; An SCG connection failure occurs again during the operation of the timer; During the operation of the timer, the number of SCG connection failures reaches the fifth threshold; During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification is deleted, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to the condition addition or condition modification; During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to condition addition or condition modification becomes invalid; During the operation of the timer, a synchronous reconfiguration message for changing the MCG sent by the network device is received; During the operation of the timer, trigger the failure of the MCG radio link; During the running of the timer, a timely handover configuration message sent by the network device is received; the timely handover configuration message is used to control the terminal device to immediately trigger an access process with the target PCell or target PSCell. The method according to any one of claims 10 to 14, wherein the SCG connection failure reasons in the SCG connection failure report information include: When continuous SCG connection failures occur, conditional SCG handover failures occur, or a cell that does not meet the first condition is selected, an SCG connection reestablishment or recovery process is initiated. The method according to any one of claims 10 to 15, wherein the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs. The method according to any one of claims 10 to 16, wherein when the number of SCG connection failures is at least twice, The processing of the SCG connection failure report information according to the result of SCG connection recovery or re-establishment includes: Report the SCG connection failure report information of the latest SCG connection failure; Or, report SCG connection failure report information of at least two SCG connection failures. The method according to claim 17, characterized in that, in the case of reporting the SCG connection failure report information of the latest SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time; or, The SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed SCG connection at least twice. The method according to any one of claims 1 to 18, further comprising: When successfully reestablishing or restoring the SCG connection through the selected first cell, report the identification information or logical identification information of the designated SCG cell to the MCG or the SCG where the connection is established. The method according to claim 19, wherein the identification information or logical identification information of the specified SCG cell comprises: Identification information or logical identification information of the successfully accessed SCG cell; Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before successfully accessing the SCG cell; Or, the identification information or logical identification information of the successfully accessed SCG cell, and the identification information or logical identification information of at least one SCG cell whose SCG connection failed before the successful access to the SCG cell. The method according to any one of claims 1 to 20, further comprising: The first indication information sent by the network device is received, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery. The method according to any one of claims 1 to 21, further comprising: Send capability indication information to the network device, where the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reestablishment or recovery. A method for receiving information, characterized in that the method is executed by a network side device, and the method includes: Receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or re-establishment; Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition. The method according to claim 23, wherein the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs. A method according to claim 23 or 24, characterized in that, The SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure; Alternatively, the SCG connection failure report information includes SCG connection failure report information of at least two SCG connection failures. The method according to claim 25, wherein when the SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time; or, The SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed SCG connection at least twice. The method according to any one of claims 23 to 26, further comprising: receiving the identification information or logical identification information of the designated SCG cell reported by the terminal device to the MCG or the established SCG when successfully reestablishing or restoring the SCG connection through the selected first cell. The method according to claim 27, wherein the identification information or logical identification information of the specified SCG cell comprises: Identification information or logical identification information of the SCG cell that the terminal device successfully accesses; Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before the terminal device successfully accesses the SCG cell; Or, the identification information or logical identification information of the SCG cell that the terminal device successfully accesses, and the identification information or logical identification information of at least one SCG cell that fails to connect to the SCG before the terminal device successfully accesses the SCG cell. The method according to any one of claims 23 to 28, further comprising: Sending first indication information to the terminal device, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery. The method according to any one of claims 23 to 29, further comprising: Receive capability indication information sent by the terminal device, where the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reestablishment or recovery. A device for establishing a connection, characterized in that the device includes: A connection module, configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connection state and the SCG connection fails; The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition. The device according to claim 31, wherein the target configuration information includes at least one of the following information: Conditionally add the configuration information of the target primary and secondary cell PSCell of CPA; Conditionally modify the configuration information of the target PSCell of the CPC; Conditionally add the conditional handover trigger condition configuration information associated with the target PSCell of the CPA; And, conditionally modify the conditional handover trigger condition configuration information associated with the target PSCell of the CPC. The device according to claim 32, wherein the first condition comprises: at least one of a cell selection condition, a first measurement event, and a handover condition in conditional handover trigger condition configuration information. The apparatus according to claim 33, wherein the first measurement event comprises at least one of the following events: The measurement result of the first cell is greater than or equal to a first measurement result threshold; The measurement result of the first cell is greater than the measurement result of the primary cell, and the difference between the measurement result of the first cell and the measurement result of the primary cell is greater than or equal to an offset; The measurement result of the first cell is greater than or equal to a second measurement result threshold, and the measurement result of the primary cell is less than or equal to a third measurement result threshold; The distance between the terminal device and the first cell is less than or equal to a first distance threshold; The distance between the terminal device and the first cell is less than or equal to a second distance threshold, and the distance between the terminal device and the primary cell is greater than or equal to a third distance threshold. The device according to claim 33 or 34, wherein the first measurement event is configured in at least one of the following ways: Preset mode, system broadcast message mode or dedicated signaling mode. The device according to any one of claims 31 to 35, wherein the connection module is used for: When the terminal device is in a dual connection state and the SCG connection fails, start a timer; Before the timer expires, the SCG connection is recovered or reestablished through the first cell. The device according to claim 36, wherein the connection module is configured to: Before the timer expires, the step of selecting the first cell to restore or re-establish the SCG connection is performed once; or, Before the timer expires, and the number of failures to restore or re-establish the SCG connection during the running of the timer is less than or equal to the first number threshold, select the first cell to restore or re-establish the SCG connection. The device according to claim 36, wherein the connection module is configured to: When the first SCG connection failure after the terminal device successfully receives the first reconfiguration message each time, start the timer; the first reconfiguration message includes configuration information of the target PSCell of the CPA or CPC; Or, when the first SCG connection failure after the terminal device successfully receives the second reconfiguration message each time, start a timer; the second reconfiguration message includes configuration information of PSCell cell addition or PSCell cell modification; Or, when the first SCG connection fails after the terminal device successfully receives the third reconfiguration message each time, start a timer; Or, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, start a timer; Or, whenever the terminal device fails to connect to the SCG and the timer is not running, start the timer; Alternatively, the timer is started whenever the terminal device fails to connect to the SCG and the terminal device stores configuration information of at least one SCG cell and the timer is not running. Apparatus according to any one of claims 31 to 35, wherein The connection module is configured to select the first cell to restore or re-establish the SCG connection when the terminal device is in the dual-connection state and the number of failures to restore or re-establish the SCG connection is less than or equal to the second threshold value after the SCG connection fails. . The device according to any one of claims 31 to 39, wherein the device further comprises: A report generating module, configured to generate SCG connection failure report information when the terminal device is in a dual connection state and the SCG connection fails; The report processing module is configured to process the SCG connection failure report information according to the result of SCG connection recovery or re-establishment. The device according to claim 40, wherein the report processing module is configured to: When the timer expires, the terminal device reports the SCG connection failure report information to the main cell group MCG; When the terminal device fails to connect to the SCG again during the operation of the timer, the terminal device reports SCG connection failure report information to the MCG; When the number of SCG connection failures of the terminal device during the operation of the timer reaches a third threshold, the terminal device reports SCG connection failure report information to the MCG; When the timer stops, the terminal device reports SCG connection failure report information to the MCG; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device deletes previously stored SCG connection failure report information; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the successfully accessed first cell; When successfully reestablishing or restoring the SCG connection through the selected first cell, the terminal device reports SCG connection failure report information to the MCG; Alternatively, when the number of SCG connection failures that occur again reaches a fourth threshold, the terminal device reports SCG connection failure report information to the MCG. The device according to claim 41, wherein the reasons for the timeout of the timer include: The first cell that meets the first condition is not selected during the running of the timer; or, selecting the first cell satisfying the first condition during the running of the timer, and failing to access the first cell satisfying the first condition during the running of the timer . The device according to claim 41 or 42, wherein the device further comprises: a deletion module, configured to: When the timer expires, the terminal device deletes the stored configuration information of at least one conditionally added or conditionally modified target PSCell cell, and the conditional handover trigger condition configuration associated with the conditionally added or conditionally modified target PSCell cell information; Or, when the timer expires, the terminal device deletes all stored configuration information related to conditional switching. The device according to claim 41, wherein the reasons for stopping the timer include: Selecting a cell that satisfies the first condition during the running of the timer, and successfully completing a random access procedure with the first cell or successfully completing uplink synchronization with the first cell before the timer expires ; Selecting a cell satisfying the first condition during the running of the timer, and successfully sending a reconfiguration complete message to the MCG or the first cell before the timer expires; An SCG connection failure occurs again during the operation of the timer; During the operation of the timer, the number of SCG connection failures reaches the fifth threshold; During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification is deleted, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to the condition addition or condition modification; During the operation of the timer, the stored configuration information of the target PSCell cell with condition addition or condition modification, and the conditional handover trigger condition configuration information associated with the target PSCell cell corresponding to condition addition or condition modification becomes invalid; During the operation of the timer, a synchronous reconfiguration message for changing the MCG sent by the network device is received; During the operation of the timer, trigger the failure of the MCG radio link; During the running of the timer, a timely handover configuration message sent by the network device is received; the timely handover configuration message is used to control the terminal device to immediately trigger an access process with the target PCell or target PSCell. The device according to any one of claims 40 to 44, wherein the reasons for the SCG connection failure in the SCG connection failure report information include: When continuous SCG connection failures occur, conditional SCG handover failures occur, or a cell that does not meet the first condition is selected, an SCG connection reestablishment or recovery process is initiated. The device according to any one of claims 40 to 45, wherein the SCG connection failure report information includes: identification information or logical identification information of a cell where the SCG connection failure occurs. The device according to any one of claims 40 to 46, wherein when the number of SCG connection failures is at least two, said report processing module for, Report the SCG connection failure report information of the latest SCG connection failure; Or, report SCG connection failure report information of at least two SCG connection failures. The device according to claim 47, wherein when reporting the SCG connection failure report information of the latest SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time; or, The SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed SCG connection at least twice. The device according to any one of claims 31 to 48, wherein the device further comprises: The identification reporting module is configured to report the identification information or logical identification information of the designated SCG cell to the MCG or the SCG where the connection is established when the SCG connection is successfully reestablished or restored through the selected first cell. The device according to claim 49, wherein the identification information or logical identification information of the designated SCG cell includes: Identification information or logical identification information of the successfully accessed SCG cell; Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before successfully accessing the SCG cell; Or, the identification information or logical identification information of the successfully accessed SCG cell, and the identification information or logical identification information of at least one SCG cell whose SCG connection failed before the successful access to the SCG cell. The device according to any one of claims 31 to 50, wherein the device further comprises: The indication receiving module is configured to receive first indication information sent by the network device, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery. The device according to any one of claims 31 to 51, wherein the device further comprises: An indication sending module, configured to send capability indication information to the network device, where the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reestablishment or recovery. An information receiving device, characterized in that the device includes: The receiving module is used to receive SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or reconstruction; Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition. The device according to claim 53, wherein the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs. Apparatus according to claim 53 or 54, characterized in that, The SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure; Alternatively, the SCG connection failure report information includes SCG connection failure report information of at least two SCG connection failures. The device according to claim 55, wherein when the SCG connection failure report information includes the SCG connection failure report information of the latest SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell whose SCG connection failed last time; or, The SCG connection failure report information includes identification information or logical identification information of SCG cells that have failed SCG connection at least twice. The device according to any one of claims 53 to 56, wherein the receiving module is further configured to receive a message from the MCG or established SCG when the terminal device successfully reestablishes or restores the SCG connection through the selected first cell. Reported by the connected SCG, specify the identification information or logical identification information of the SCG cell. The device according to claim 57, wherein the identification information or logical identification information of the designated SCG cell includes: Identification information or logical identification information of the SCG cell that the terminal device successfully accesses; Identification information or logical identification information of at least one SCG cell that failed to connect to the SCG before the terminal device successfully accesses the SCG cell; Or, the identification information or logical identification information of the SCG cell that the terminal device successfully accesses, and the identification information or logical identification information of at least one SCG cell that fails to connect to the SCG before the terminal device successfully accesses the SCG cell. The device according to any one of claims 53 to 58, wherein the device further comprises: A sending module, configured to send first indication information to the terminal device, where the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reestablishment or recovery. The device according to any one of claims 53 to 59, wherein the receiving module is further configured to receive capability indication information sent by the terminal equipment, the capability indication information is used to indicate whether the terminal equipment supports The function of SCG connection reestablishment or recovery. A computer device, characterized in that the computer device is implemented as a terminal device, and the computer device includes a processor, a memory, and a transceiver; The transceiver is configured to restore or re-establish the SCG connection through the first cell when the terminal device is in the dual connectivity state and the SCG connection fails; The first cell is a cell in which corresponding target configuration information has been stored in the terminal device and which satisfies a first condition. A computer device, characterized in that the computer device is implemented as a network side device, and the computer device includes a processor, a memory, and a transceiver; The transceiver receives SCG connection failure report information; the SCG connection failure report information is generated when the terminal device is in a dual connection state and the SCG connection fails, and is reported according to the result of SCG connection recovery or reconstruction; Wherein, the process of restoring or reestablishing the SCG connection is performed through a first cell, and the first cell is a cell that has stored corresponding target configuration information in the terminal device and satisfies the first condition. A computer-readable storage medium, wherein a computer program is stored in the storage medium, and the computer program is used to be executed by a processor to implement the connection establishment method according to any one of claims 1 to 22 , or, implement the information receiving method as described in any one of claims 23 to 30. A computer program product, characterized in that the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium; a processor of a computer device executes the computer instructions, so that the computer device performs the following steps: The method for establishing a connection according to any one of claims 1 to 22, or implementing the method for receiving information according to any one of claims 23 to 30. A computer program, characterized in that the computer program includes computer instructions, and the processor of the computer device executes the computer instructions, so that the computer device executes the connection establishment method according to any one of claims 1 to 22, Or, implement the information receiving method as claimed in any one of claims 23 to 30. A chip, characterized in that the chip is used to execute the method for establishing a connection according to any one of claims 1 to 22, or to implement the method for receiving information according to any one of claims 23 to 30.

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