CN118235461A - Connection establishment method, device, computer equipment, storage medium and program product - Google Patents

Abstract

A connection establishment method, device, computer equipment, storage medium and program product, belonging to the field of wireless communication technology. The method includes: when the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the secondary cell group SCG connection is restored or rebuilt through a first cell; the first cell is a cell (201) in which the corresponding target configuration information has been stored in the terminal device and meets the first condition. The above scheme does not need to wait for the MCG to trigger the reconfiguration process, reduces unnecessary reconfiguration processes, reduces the additional delay and signaling overhead caused by the reconfiguration process, improves the efficiency of network transmission, and improves user experience.

Description

Connection establishment method, device, computer equipment, storage medium and program product Technical Field

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

Background technique

A dual connectivity (DC) scenario is a scenario in which two wireless connections are used simultaneously for data communication.

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 communicate with the network side through the above two connections at the same time.

Summary of the invention

The embodiments of the present application provide a connection establishment method, apparatus, computer equipment, storage medium and program product. The technical solution is as follows:

On the one hand, an embodiment of the present application provides a connection establishment method, which is performed by a terminal device and includes:

When the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the secondary cell group SCG connection is restored or rebuilt through the first cell;

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

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

Receiving 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;

The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition.

In another aspect, an embodiment of the present application provides a connection establishment device, the device comprising:

A connection module, used for recovering or reestablishing the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails;

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

On the other hand, an embodiment of the present application provides an information receiving device, the device comprising:

A receiving module, 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;

The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets 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 used to restore or reestablish the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails;

The first cell is a cell for which corresponding target configuration information has been stored in the terminal device and which 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 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;

The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition.

On the other hand, an embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is loaded and executed by a processor to implement the above-mentioned connection establishment method or information receiving method.

On the other hand, a computer program product or a computer program is provided, the computer program product or the computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a 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-mentioned connection establishment method or information receiving method.

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

When the terminal device is in a 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. There is no need to wait 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, improves network transmission efficiency, and improves user experience.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of a network architecture of a communication system provided by an embodiment of the present application;

FIG2 is a flow chart of a connection establishment method provided by an embodiment of the present application;

FIG3 is a flow chart of an information receiving method provided by an embodiment of the present application;

FIG4 is a flow chart of a connection establishment method provided by an embodiment of the present application;

FIG5 is a block diagram of a connection establishment device provided by an embodiment of the present application;

FIG6 is a block diagram of an information receiving device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of the structure of a computer device provided in one embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

Please refer to FIG1 , 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 usually multiple, and one or more terminals 10 may be distributed in the 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 (UE), mobile stations (MS), terminal devices, etc. For the convenience of description, in the embodiments of the present application, the above-mentioned devices are collectively referred to as terminals.

The base station 20 is a device deployed in the access network to provide wireless communication functions 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, etc. 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 (NR) system, it is called gNodeB or gNB. With the evolution of communication technology, the name "base station" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal 20 are collectively referred to as base stations.

Optionally, what is not shown in Figure 1 is that the above-mentioned network architecture also includes other network devices, such as: a central control node (CNC), an access and mobility management function (AMF) device, a session management function (SMF) or a user plane function (UPF) device, etc.

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

Before introducing the solutions shown in the subsequent embodiments of this application, several terms and concepts involved in this application are first introduced.

1) Dual-Connectivity (DC)

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

In the process of 5G network deployment, 5G cells can be used as independent macro coverage networks or as small base stations to enhance the coverage and capacity of Long Term Evolution (LTE) networks. Regardless of the networking method used, dual-connectivity technology can be used to achieve interconnection between LTE-5G systems, thereby improving the wireless resource utilization of the entire mobile network system, reducing the system switching delay, and improving user and system performance. Based on LTE dual-connectivity technology, the 3GPP organization has defined dual-connectivity technology for LTE and 5G. LTE-5G dual-connectivity is a key technology for operators to achieve LTE and 5G converged networking and flexible deployment scenarios. In the early stage of 5G, rapid deployment can be achieved based on the existing LTE core network. In the later stage, comprehensive network coverage can be achieved through the joint networking of LTE and 5G, improving the wireless resource utilization of the entire network system, reducing the system switching delay, and improving user and system performance.

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

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

On the control plane, both the MN and SN sides have Radio Resource Control (RRC) entities, and both can generate RRC Protocol Data Units (PDUs). 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 (SRB) 0, SRB1, and SRB2; EN-DC further supports SRB3 on this basis. SRB3 is used to transmit RRC signaling between SN and UE. The signaling content of this signaling bearer does not require negotiation of resources and UE capabilities with MN. At the same time, in order to improve the reliability of SRB1 and SRB2, EN-DC supports split SRB1 and split SRB2, that is, the Packet Data Convergence Protocol (PDCP) PDU corresponding to the RRC message generated by MN is repeatedly transmitted on the SN side to ensure its high reliability.

The NR system stipulates that when an SCG connection failure occurs, 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 (PCell) changes, and the switching configuration message sent by the source PCell to the terminal device includes at least one configuration information of a conditional switching target PCell cell and the conditional switching condition configuration information of the corresponding conditional switching target PCell cell; after the conditional switching is successfully executed, that is: after the terminal device successfully accesses a conditional switching target PCell cell, the terminal device will delete all previously saved configuration information of the conditional switching target PCell cell and the conditional switching condition configuration information of the corresponding conditional switching target PCell cell.

Scenario 2: Conditional primary secondary cell (PSCell) addition (hereinafter referred to as conditional addition) or conditional PSCell modification (hereinafter referred to as conditional modification), the switching configuration message sent by the PCell or PSCell to the terminal device includes at least one configuration information of the target PSCell cell for conditional addition or conditional modification and the conditional switching condition configuration information of the corresponding target PSCell cell for conditional addition or conditional modification; after the conditional switching is successfully executed, that is: after the terminal device successfully accesses a conditional switching target PSCell cell, the terminal device will delete all previously saved configuration information of the conditional switching target PSCell cell and the conditional switching condition configuration information of the corresponding conditional switching target PSCell cell.

In the above scheme, once the SCG connection failure occurs in the terminal device, the terminal device needs to suspend all SCG-related configurations (interrupt the SCG connection) and send an SCG connection failure report to the MCG. That is, once the SCG connection failure occurs in the terminal device, the SCG connection 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, the MCG triggers the SCG release process to return the terminal device to a single connection state; or the MCG triggers the reconfiguration process to configure a new SCG cell for the terminal device, and the terminal device attempts to restore the SCG connection based on the newly configured SCG cell.

The terminal device behavior after the above-mentioned SCG connection failure is overly dependent on the MCG network implementation. 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 terminal device to quickly restore the DC high-speed state or save power. In particular, for the conditional PSCell addition or conditional PSCell modification scenarios, relying on MCG reconfiguration means that the configuration information of multiple target PSCell cells previously stored by the terminal device is abandoned and may even be overwritten by the new SCG configuration under the control of the MCG, resulting in unnecessary reconfiguration processes. The reconfiguration process brings additional delay and overhead problems, affecting the user experience.

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

Step 201, when the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the secondary cell group SCG connection is restored or rebuilt through the first cell; the first cell is a cell that has stored the corresponding target configuration information in the terminal device and meets the first condition.

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

To summarize, in the scheme shown in the embodiment of the present application, when the terminal device is in a 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. There is no need to wait 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, improves the efficiency of network transmission, and improves 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. In some cases, the terminal device needs to report the above SCG connection failure report information.

Please refer to FIG3, which shows a flow chart of a connection establishment method provided by an embodiment of the present application, which method can be executed by a network side device, wherein the network side device can be a base station or other network device in the network architecture shown in FIG1. The method can include the following steps:

Step 301, 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; the SCG connection recovery or reconstruction process is executed through the first cell, and the first cell is a cell that has stored the corresponding target configuration information in the terminal device and meets the first condition.

To summarize, in the scheme shown in the embodiment of the present application, when the terminal device is in a 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, and report the SCG connection failure report information based on the recovery or reconstruction of the SCG connection; 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 be informed of the recovery or reconstruction of the SCG connection on the terminal device side, thereby reducing unnecessary reconfiguration processes, reducing the additional delay and signaling overhead caused by the reconfiguration process, improving the efficiency of network transmission, and improving the user experience.

Please refer to FIG4, which shows a flow chart of a connection establishment method provided by an embodiment of the present application, which method can be executed by a terminal device, wherein the terminal device can be a terminal in the network architecture shown in FIG1. The method can include the following steps:

Step 401: When the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the terminal device recovers or reconstructs the secondary cell group SCG connection through the first cell.

When the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the terminal device selects a 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 a dual connection state and the secondary cell group SCG connection fails, the terminal device can select the first cell that meets the first condition from the main cell, secondary cell, main and secondary cell corresponding to the previous SCG, and the cell in which the terminal device stores the cell configuration information, and restore or rebuild the secondary cell group SCG connection through the first cell.

In an embodiment of the present application, when an SCG connection failure occurs in a terminal device, if the terminal device can find a first cell that meets the first condition, the terminal device can attempt to re-establish or restore the SCG connection through the first cell.

In a possible implementation, 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 dual connection state and the SCG connection fails, the timer is started;

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

In a possible implementation, 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 reestablish the SCG connection is performed once;

Alternatively, before the timer expires, and the number of failures to restore or reestablish the SCG connection during the timer is running is less than or equal to the first number threshold, the first cell is selected to restore or reestablish the SCG connection.

In a possible implementation, starting a timer includes:

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

Alternatively, each time the terminal device successfully receives a second reconfiguration message and the first SCG connection fails, the timer is started; the second reconfiguration message includes configuration information of adding a PSCell cell or modifying a PSCell cell;

Alternatively, each time the terminal device successfully receives the third reconfiguration message and the first SCG connection fails, the timer is started;

Alternatively, each time the terminal device successfully accesses an SCG cell and the first SCG connection fails, the timer is started;

Alternatively, whenever an SCG connection failure occurs in the terminal device and the timer is not running (or the timer is not started), the timer is started;

Alternatively, whenever an SCG connection failure occurs in the terminal device and the terminal device stores configuration information of at least one SCG cell, and the timer is not running, the timer is started.

Optionally, based on the above-mentioned timer start conditions, it may be necessary to further determine whether the first indication information enables the function of triggering SCG connection reconstruction or recovery, wherein the first indication information is used to indicate whether the terminal device enables the function of triggering SCG connection reconstruction or recovery (the specific meaning is described later).

Exemplarily, the timer start condition is: whenever an SCG connection failure occurs in the terminal device and the first indication information indicates to start the function of triggering SCG connection reconstruction or recovery, and the timer is not running, the terminal device starts the timer;

For another example, whenever an SCG connection failure occurs in a terminal device and the terminal device stores configuration information of at least one SCG cell, and the first indication information indicates to enable the function of triggering SCG connection reconstruction or recovery, and the timer is not running, the terminal device starts the timer.

That is to say, when it is necessary to further judge the first indication information, if the first indication information indicates that the function of triggering SCG connection reconstruction 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, 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 after the SCG connection fails, when the number of failures to restore or rebuild the SCG connection is less than or equal to the second number threshold, the first cell is selected to restore or rebuild the SCG connection.

In the embodiment of the present application, the process of the terminal device restoring or reestablishing the secondary cell group SCG connection through the first cell may have at least one of the following implementation methods:

Implementation method 1: When an SCG connection failure occurs in a terminal device, a timer T1 is started or restarted. Before timer T1 times out, if the terminal device can find a first cell that meets the first condition, the terminal device can try to re-establish or restore the SCG connection through the first cell.

In one implementation, during the running of timer T1, the terminal device attempts the SCG connection recovery or SCG re-establishment process once by default. The failure of the SCG connection recovery or SCG re-establishment process attempted once during the running of timer T1 means the SCG connection failure, that is, the second attempt to recover or re-establish the SCG connection is not allowed; or, in another implementation, during the running of timer T1, the terminal device can attempt the SCG connection recovery or SCG re-establishment process any number of times by default (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 timer T1 times out.

Implementation method two: When an SCG connection failure occurs in the terminal device, a timer T1 is started or restarted. Before timer T1 times out, if the terminal device can find a first cell that meets the first condition, the terminal device can attempt to re-establish or restore the SCG connection through the first cell. At the same time, while timer T1 is running, the terminal device can attempt the SCG connection recovery or SCG re-establishment process M times (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 the SCG connection recovery or SCG re-establishment process is attempted M times, or until timer T1 times out.

Implementation method three: When an SCG connection failure occurs in the terminal device, there is no time limit. If the terminal device can find a first cell that meets the first condition, the terminal device can attempt to re-establish or restore the SCG connection through the first cell, and the terminal device can attempt the SCG connection recovery or SCG re-establishment process up to M times (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 the SCG connection recovery or SCG re-establishment process is attempted M times.

Optionally, the conditions for starting or restarting timer T1 may include: starting or restarting timer T1 each time the first SCG connection failure occurs after the terminal device successfully receives a reconfiguration message containing configuration information of the target PSCell cell of at least one conditional addition (Conditional PSCell Addition, CPA) or conditional modification (Conditional PSCell Change, CPC); or, starting or restarting timer T1 each time the first SCG connection failure occurs after the terminal device successfully receives a reconfiguration message containing PSCell cell addition or PSCell cell modification; or, starting or restarting timer T1 each time the first SCG connection failure occurs after the terminal device successfully receives the reconfiguration message; or, starting or restarting timer T1 each time the first SCG connection failure occurs after the terminal device successfully accesses an SCG cell; or, starting or restarting timer T1 each time an SCG connection failure occurs in the terminal device and the timer is not running; or, starting or restarting timer T1 each time an SCG connection failure occurs in the terminal device and the terminal device stores configuration information of at least one SCG cell and the timer is not running.

The timer T1 or parameter M can be configured in any of the following ways:

Default method (such as protocol regulations), system broadcast message method (such as, configured to the terminal device by the network side through a system broadcast message) or dedicated signaling method (such as, configured to the terminal device by the network side 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 cells PSCell of CPA;

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

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

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

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

That is to say, if the above prerequisites are not met, the terminal device can generate an SCG failure report and report the SCG failure report to the MCG when an SCG connection failure occurs.

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

The physical layer configuration that the terminal should use in the target PSCell cell, the MAC layer configuration that the terminal should use in the target PSCell cell, the RLC layer configuration that the terminal should use in the target PSCell cell, the DRB-related configuration that the terminal should use in the target PSCell cell, the frequency band and bandwidth-related configuration supported by the cell, and the random access configuration.

Exemplarily, the conditional switching event type corresponding to the conditional switching 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 target handover cell measurement result is higher than a second threshold;

Condition A5 event: the current PCell/PSCell cell measurement result of the terminal device is lower than a third threshold and the target handover cell measurement result 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 less 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 may be configured to the terminal device by the network side through a system broadcast message or dedicated signaling.

Optionally, there are two possible configuration formats for time 2:

The first is to give it directly in UTC time, such as year-month-day-hour-minute-second format: 2021.11.25 17:43:05;

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

In an embodiment of the present application, if the conditional switching trigger condition configuration information associated with a target PSCell cell to which a condition is added or modified includes at least two trigger event configuration information, the meaning of the conditional switching trigger condition associated with the target PSCell cell to which the condition is added or modified correspondingly is satisfied may refer to:

At least two events corresponding to the trigger event configuration information are triggered before the conditional switching trigger condition associated with the target PSCell cell with the corresponding added or modified condition is considered to be met; or,

If at least one of the events corresponding to at least two trigger event configuration information is triggered, it is considered that the conditional switching trigger condition associated with the target PSCell cell to which the corresponding condition is added or modified is met.

Among them, the embodiments of the present application do not limit the meaning of the conditional switching trigger condition being met.

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

Exemplarily, the above-mentioned conditional switching trigger condition configuration information is a conditional switching trigger condition configuration associated with the target PSCell cell configuration of the corresponding 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 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 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 main cell is greater than or equal to the third distance threshold.

The first measurement event may be configured in at least one of the following ways:

Pre-set method (such as default value specified by the protocol), system broadcast message method or dedicated signaling method.

In the embodiment of the present application, the meaning of satisfying the first condition may include any of the following:

The terminal device stores the conditions for selecting a cell, the PSCell cell adds configuration information, or stores the conditions for selecting a cell, the PSCell cell modifies configuration information and meets the cell selection conditions;

The terminal device stores conditional PSCell cell addition configuration information for selecting a cell or stores conditional PSCell cell modification configuration information for selecting a cell and satisfies the switching condition in the conditional switching trigger condition configuration information associated with the target PSCell cell for the corresponding selected conditional addition or conditional modification;

The terminal device stores the PSCell cell addition configuration information for selecting a cell or stores the PSCell cell modification configuration information for selecting a cell, and at the same time satisfies the first measurement event.

In an exemplary solution of the 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 cell measurement result is one offset higher than the PCell measurement result;

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, the satisfaction condition of the combined event is that if at least one single event (the above events 1 to 5 can all be referred to as single events) is satisfied, the combined event is considered to be satisfied; or, when all single events included in the combined event are satisfied, the combined event is considered to be satisfied, and this application does not limit this.

Step 402, optionally, when the terminal device is in a dual connection state and the secondary cell group SCG connection fails, SCG connection failure report information is generated.

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

The cell selection criteria are met 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 ;

The meanings of the above symbols can be shown as follows:

S _rxlev : cell selection receiving level value;

S _qual : cell selection quality value;

Q _offsettemp : the offset temporarily applied to the cell;

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

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

Q _rxlevmin : The minimum reception level required in the cell. If the UE supports the Supplementary UpLink (SUL) frequency of the cell, Q _rxlevmin is obtained from qR _xLevMinSUL (if present) in SIB1, SIB2 and SIB4. In addition, if Q _{rxlevminoffsetcellSUL} of the relevant cell exists in SIB3 and SIB4, the cell-specific offset is added to the corresponding Q _rxlevmin to achieve the minimum reception level required in the relevant cell. Otherwise, Q _rxlevmin is obtained from qR _xLevMin in SIB1, SIB2 and SIB4; in addition, if Q _{RXLEVMINOVSETCELL} exists in SIB3 and SIB4 of the relevant cell, the cell-specific offset is added to the corresponding Q _rxlevmin to achieve the minimum reception level required in the relevant cell.

Q _qualmin : The minimum quality level required for the cell. In addition, if Q _{qualminoffsetcell} is signaled to the concerned cell, an offset specific to that cell is added to achieve the minimum required quality level in the concerned cell.

_{Qrxlevminoffset} : offset of signal _Qrxlevmin considered in the evaluation of _Srxlev , as a result of periodic searches for higher priority PLMNs when camped normally in a Visited Public Land Mobile Network (VPLMN).

Q _{qualminoffset} : The offset of the signal Q _qualmin considered in the Q _qual evaluation, as a result of periodic searches for higher priority PLMNs when camped normally in a Visited Public Land Mobile Network (VPLMN).

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

max( _PEMAX1 – _PPowerClass , 0)–(min( _PEMAX2 , _PPowerClass )–min( _PEMAX1 , _PPowerClass ));

Otherwise, max( _PEMAX1 – _PPowerClass , 0).

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

P _PowerClass : Maximum RF output power of the UE, determined according to the UE power class.

Among them, the signal values _{Qrxlevminoffset} and _{Qqalminoffset} are only applied in the following cases: when camping normally in a VPLMN, the cell selection is evaluated due to a periodic search for a higher priority PLMN. During this periodic search for a higher priority PLMN, the UE can use the parameter values stored from different cells of the higher priority PLMN to check the selection criteria of the cell.

Step 403: Optionally, the SCG connection failure report information is processed according to the result of the SCG connection recovery or reconstruction.

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

When the timer times out, the terminal device reports the SCG connection failure report information to the master cell group MCG;

When the terminal device fails to connect to the SCG again during the operation 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 operation of the timer reaches the third number 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 the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device deletes the previously stored SCG connection failure report information;

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

When the SCG connection is successfully reestablished or restored 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 reaches the fourth threshold, the terminal device reports SCG connection failure report information to the MCG.

That is to say, in an embodiment of the present application, when the terminal device is in a dual connection state and the SCG connection fails, SCG connection failure report information can be generated, and when the terminal device performs the SCG connection recovery or reconstruction process through the first cell, the SCG connection failure report information can also be reported according to the result of the SCG connection recovery or reconstruction.

Optionally, when an SCG connection failure occurs in a terminal device, SCG failure report information when the SCG failure occurs is also recorded. The processing behavior of the SCG failure report information may be any of the following:

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

If an SCG failure occurs again during the operation of timer T1, the terminal device is triggered to report SCG failure information to the MCG;

If the SCG failure occurs again during the operation of timer T1 and reaches the maximum number of times M, the terminal device is triggered to report the SCG failure report information to the MCG;

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

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

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 first cell that has been successfully accessed;

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 terminal device fails to connect to the SCG again for M times, the terminal device reports the SCG connection failure report information to the MCG.

In a possible implementation, the reasons for the timer timing out include:

During the running of the timer, the first cell satisfying the first condition is not selected;

Alternatively, a first cell satisfying the first condition is selected during the running of the timer, and access to the first cell satisfying the first condition is not successfully performed during the running of the timer.

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

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

In one possible implementation, when timer T1 times out, the terminal device may delete the stored configuration information of the target PSCell cell with at least one condition added or condition modified related to the SCG, and delete the conditional switching trigger condition configuration information associated with the target PSCell cell with the corresponding condition added or condition modified related to the SCG.

Alternatively, when timer T1 times out, the terminal device may delete all stored configuration information related to the SCG corresponding to the conditional PSCell addition or conditional PSCell modification.

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

During the operation of the timer, a cell satisfying the first condition is selected, and before the timer times out, a random access procedure is successfully completed with the first cell or uplink synchronization is successfully completed with the first cell;

During the running of the timer, a cell satisfying the first condition is selected, and a reconfiguration completion message is successfully sent to the MCG or the first cell before the timer expires;

During the timer period, another SCG connection failure occurs;

The number of SCG connection failures that occur during the timer reaches the fifth number threshold;

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

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

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

During the timer operation, the MCG radio link fails;

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

In the solution shown in the embodiment of the present application, the triggering 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 operation 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 times out;

The terminal device finds the first cell that meets the preset condition 1 during the operation of timer T1 and successfully sends a reconfiguration completion message to the MCG or the first cell before the timer T1 times out;

The terminal device experiences another SCG failure during the operation of timer T1;

The terminal device has a maximum number of SCG failures M during the operation of timer T1;

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

During the operation of timer T1, the terminal device determines that all stored configuration information of the target PSCell cell with at least one condition added or condition modified and the conditional switching trigger condition configuration information associated with the target PSCell cell with the corresponding condition added or condition modified have become invalid;

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

The terminal device triggers the failure of the MCG radio link during the operation of timer T1;

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

The above-mentioned timely switching configuration message is relative to the conditional switching configuration message. After the terminal device successfully receives the timely switching 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, the SCG connection failure cause in the SCG connection failure report information includes:

The SCG connection reconstruction or recovery process is initiated when continuous SCG connection failures, conditional SCG switching failures, or a cell that meets the first condition is not selected.

In an embodiment of the present application, the reasons for SCG connection failure may include: continuous SCG failure, conditional SCG switching failure, or failure to find any SCG cell that meets the conditions to initiate the SCG connection re-establishment or recovery process.

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

The T310 timer used by the SCG side to determine synchronization abnormality has timed out, the random access process on the SCG side has failed (for example, the random access attempts have reached the specified maximum number of times), the Radio Link Control (RLC) on the SCG side has retransmitted the maximum number of times, the SCG reconfiguration process has failed, the SCG synchronization reconfiguration process has failed, the SRB3 integrity protection check on the SCG side has failed, the LBT (Listen Before Talk) process on the SCG side has failed, the SCG beam failure recovery process has failed, the T312 timer used by the SCG side to quickly determine connection failure has timed out, and the backhaul link on the SCG side has failed.

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

Among them, the identification information of the cell where the SCG failure occurs is represented by a cell global identifier (Cell Global Identifier, CGI), a frequency point + a physical cell identifier (Physical Cell Identifier, PCI) or a serving cell identifier (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 modified in the conditional handover configuration process. The meaning of the logical identification is illustrated by Table 1:

Table 1

As shown in Table 1, a logical identification information is associated with a conditional switching target PSCell configuration and the target PSCell conditional switching trigger condition configuration. The main function of the logical identification information is to identify a configuration corresponding to a CHO (Conditional HO), CPC or CPA. Exemplarily, the logical identification 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, the SCG connection failure report information is processed, including:

Report the SCG connection failure report information of the most recent SCG connection failure;

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

In a possible implementation, when reporting the SCG connection failure report information of the most recent SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice.

In the scheme shown in the embodiment of the present application, if multiple SCG failure events occur before the terminal device reports the SCG report to the network device (exemplarily, the multiple SCG failures only include SCG failures that occur during the operation of timer T1; or, the multiple SCG failures include SCG failures that occur during the operation of timer T1 and SCG failures that trigger the start of timer T1), the terminal device reports the SCG report in any of the following ways:

Behavior mode 1: Report the most recent SCG failure record. The later recorded SCG failure report always overwrites the previously recorded SCG failure report, that is, the terminal device only reports the most recently recorded SCG failure report.

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

Behavior 2: Each SCG failure is recorded separately and reported together in the form of an SCG failure report list. Each SCG failure report included in the SCG failure report list includes complete SCG failure report content.

Contents of the SCG failure report under behavior mode 2: standard existing record content + the aforementioned enhanced part (i.e., the identification information or logical identification information of the cell where the SCG connection failure occurs; and/or information on the cause of the SCG connection failure, wherein the identification information or logical identification information of the cell where the SCG failure occurs is the identification information or logical identification information of the cell where the SCG failure actually occurs).

Description of behavior mode 2: If the communication system stipulates the maximum number of SCG failure reports that can be recorded in the SCG failure report list, a circular overwrite mode is used for recording. For example, if the communication system stipulates the maximum number of SCG failure reports that can be recorded in the SCG failure report list is 3, then when the fourth SCG failure occurs, the SCG failure report content of the first SCG failure is overwritten. When the fifth SCG failure occurs, the SCG failure report content of the second SCG failure is overwritten. And so on, a circular overwrite mode is used for recording. In other words, 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 stipulated by the communication system.

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 method (such as protocol requirements), system broadcast message method or dedicated signaling method.

Behavior mode 3: Report the most recent SCG failure record. The later recorded SCG failure report will overwrite the earlier recorded SCG failure report.

Contents of the SCG failure report under behavior mode 3: standard existing record content + the aforementioned enhanced part (i.e., the identification information or logical identification information of the cell where the SCG connection failure occurs; and/or information on the cause of the SCG connection failure, wherein the identification information or logical identification information of the cell where the SCG failure occurs includes the identification information or logical identification information of the cell where the SCG failure has occurred multiple times before).

In behavior mode 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, a cyclic coverage mode is used for recording. For example: 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 is 3. Then, when the fourth SCG failure occurs, the terminal device will only record the identification information or logical identification information of the cells where the SCG failure occurred for the last three times, and so on. The cyclic coverage recording is performed in this way. 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 maximum number of SCG failure cell identification information or logical identification information that can be recorded in the SCG failure report stipulated by the communication system.

The maximum number parameter of SCG failed cell identification information or logical identification information that can be recorded in the SCG failure report specified by the communication system is configured in any of the following ways:

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

Step 404, optionally, when the SCG connection is successfully rebuilt or restored through the selected first cell, the identification information or logical identification information of the specified SCG cell is reported to the MCG or the SCG that established the connection; accordingly, the network side device receives the identification information or logical identification information of the specified SCG cell.

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

The identification information or logical identification information of the SCG cell that has been successfully accessed;

Identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell;

Or, the identification information or logical identification information of the SCG cell to which access is successfully performed, and the identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell.

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

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

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

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

Including identification information or logical identification information of at least one SCG cell where SCG failure occurred before the terminal device successfully accessed the SCG cell;

It also includes the identification information or logical identification information of the SCG cell to which the terminal device successfully accesses, and the identification information or logical identification information of at least one SCG cell in which an SCG failure occurred before the terminal device successfully accessed the SCG cell.

In one possible implementation, the network side device may send a first indication message to the terminal device; correspondingly, the terminal device may receive the first indication message sent by the network device, and the first indication message is used to indicate whether the terminal device turns on the function of triggering SCG connection reconstruction or recovery.

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

If the first indication information means allowing the terminal device to trigger the SCG connection fast recovery or re-establishment attempt, the terminal device executes the above steps 401 to 404.

If the first indication information means that the terminal device is not allowed to trigger the SCG connection fast recovery or re-establishment attempt behavior, the terminal device will execute according to the existing process behavior, that is, when the SCG connection failure occurs, the terminal device generates an SCG failure report and reports the SCG failure report to the MCG, and the content of the SCG failure report is not enhanced.

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, a media access control control element (MAC Control Element, MAC CE), and downlink control information (Downlink Control Information, DCI).

In one 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 the function of SCG connection reconstruction or recovery.

To summarize, in the scheme shown in the embodiment of the present application, when the terminal device is in a 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. There is no need to wait 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, improves the efficiency of network transmission, and improves user experience.

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

The connection module 501 is used to restore or reestablish the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails;

The first cell is a cell for which corresponding target configuration information has been stored in the terminal device and which satisfies the 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 cells PSCell of CPA;

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

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

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

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

Exemplarily, the conditional switching trigger condition configuration information is a conditional switching trigger condition configuration associated with a target PSCell cell configuration corresponding to the conditional addition or conditional 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 a first measurement result threshold;

The measurement result of the first cell is greater than the measurement result of the primary cell, and a 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:

Pre-set method (such as default value specified by the protocol), system broadcast message method or dedicated signaling method.

In a possible implementation, the connection module is used to:

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

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

In a possible implementation, the connection module is used to:

Before the timer times out, the step of selecting the first cell to restore or reestablish the SCG connection is performed once;

Alternatively, before the timer times out and the number of failures to restore or reestablish the SCG connection during the running of the timer is less than or equal to the first number threshold, the first cell is selected to restore or reestablish the SCG connection.

In a possible implementation, the connection module is used to:

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

Alternatively, each time the first SCG connection fails after the terminal device successfully receives a second reconfiguration message, a timer is started; the second reconfiguration message includes configuration information of adding a PSCell cell or modifying a PSCell cell;

Alternatively, each time the terminal device successfully receives the third reconfiguration message and the first SCG connection fails, the timer is started;

Alternatively, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, starting the timer;

Alternatively, whenever an SCG connection failure occurs in the terminal device and the timer is not running, starting the timer;

Alternatively, whenever an SCG connection failure occurs in the terminal device, the terminal device stores configuration information of at least one SCG cell and the timer is not running, the timer is started.

In one possible implementation, the connection module is used to select the first cell to restore or rebuild the SCG connection when the terminal device is in a dual connection state and after the SCG connection fails, the number of failures to restore or rebuild the SCG connection is less than or equal to a second number threshold.

In a possible implementation manner, the device further includes:

A report generation module, used for generating 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 used to process the SCG connection failure report information according to the result of SCG connection recovery or reconstruction.

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

When the timer times out, the terminal device reports the SCG connection failure report information to the master 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 number 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 the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device deletes the previously stored SCG connection failure report information;

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

When the SCG connection is successfully reestablished or restored 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 reaches the fourth threshold, the terminal device reports SCG connection failure report information to the MCG.

In a possible implementation, the reason for the timer timing out includes:

During the running of the timer, the first cell satisfying the first condition is not selected;

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

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

When the timer times out, the terminal device deletes the stored configuration information of the target PSCell cell with at least one condition added or condition modified, and the conditional switching trigger condition configuration information associated with the target PSCell cell with the corresponding condition added or condition modified;

Alternatively, when the timer times out, the terminal device deletes all stored configuration information related to the conditional switching.

In a possible implementation, the reason why the timer stops includes:

During the operation of the timer, a cell satisfying the first condition is selected, and before the timer times out, a random access procedure is successfully completed with the first cell or uplink synchronization is successfully completed with the first cell;

During the running of the timer, a cell satisfying the first condition is selected, and a reconfiguration completion message is successfully sent to the MCG or the first cell before the timer times out;

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

The number of SCG connection failures that occur during the operation of the timer reaches a fifth number threshold;

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

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

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

During the operation of the timer, triggering an MCG radio link failure;

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

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

The SCG connection reconstruction or recovery process is initiated when continuous SCG connection failures, conditional SCG switching failures, or a cell that meets the first condition is not selected.

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

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

The report processing module is used to:

Report the SCG connection failure report information of the most recent SCG connection failure;

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

In a possible implementation, when reporting the SCG connection failure report information of the most recent SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice.

In a possible implementation manner, the device further includes:

The identification reporting module is used to report the identification information or logical identification information of the specified SCG cell to the MCG or the SCG that establishes the connection when the SCG connection is successfully rebuilt or restored through the selected first cell.

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

The identification information or logical identification information of the SCG cell that has been successfully accessed;

Identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell;

Or, the identification information or logical identification information of the SCG cell to which access is successfully performed, and the identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell.

In a possible implementation manner, the device further includes:

The indication receiving module is used to receive the first indication information sent by the network device, and the first indication information is used to indicate whether the terminal device turns on the function of triggering SCG connection reconstruction or recovery.

In a possible implementation manner, the device further includes:

An indication sending module is used to send capability indication information to a network device, wherein the capability indication information is used to indicate whether the terminal device supports the function of reestablishing or restoring the SCG connection.

To summarize, in the scheme shown in the embodiment of the present application, when the terminal device is in a dual connection state and the SCG connection fails, the terminal device can automatically 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. There is no need to wait 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, improves the efficiency of network transmission, and improves user experience.

Please refer to FIG6, which shows a block diagram of an information receiving device provided by an embodiment of the present application. The information receiving device 600 can be used in a network side device. As shown in FIG6, the device may include:

The receiving module 601 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;

Among them, the SCG connection recovery or reconstruction process is executed through the first cell, and the first cell is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition.

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

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

The SCG connection reconstruction or recovery process is initiated when continuous SCG connection failures, conditional SCG switching failures, or a cell that meets the first condition is not selected.

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

In a possible implementation, the SCG connection failure report information includes SCG connection failure report information of the most recent 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, when the SCG connection failure report information includes the SCG connection failure report information of the most recent SCG connection failure,

The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure;

Alternatively, the SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice.

In a possible implementation, the receiving module 601 is also used to receive the identification information or logical identification information of the designated SCG cell reported by the terminal device to the MCG or the SCG that established the connection when the terminal device successfully reestablishes or restores the SCG connection through the selected first cell.

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

The identification information or logical identification information of the SCG cell that has been successfully accessed;

Identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell;

Or, the identification information or logical identification information of the SCG cell to which access is successfully performed, and the identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell.

In a possible implementation manner, the device further includes:

A sending module is used to send a first indication message to the terminal device, wherein the first indication message is used to indicate whether the terminal device turns on a function of triggering SCG connection reconstruction or recovery.

In a possible implementation, the receiving module 601 is further used 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 reestablishing or restoring the SCG connection.

To summarize, in the scheme shown in the embodiment of the present application, when the terminal device is in a 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, and report the SCG connection failure report information based on the recovery or reconstruction of the SCG connection; 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 be informed of the recovery or reconstruction of the SCG connection on the terminal device side, thereby reducing unnecessary reconfiguration processes, reducing the additional delay and signaling overhead caused by the reconfiguration process, improving the efficiency of network transmission, and improving user experience.

One point that needs to be explained is that, when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

Please refer to FIG7 , which shows a schematic diagram of the structure of a computer device 700 provided in one 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. The processor 701 executes various functional applications and information processing by running software programs and modules.

The receiver 702 and the transmitter 703 may be implemented as a communication component, which may be a communication chip, which may also be called a transceiver.

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

The memory 704 may be used to store a computer program, and the processor 701 may be used to execute the computer program to implement each step performed by the terminal device in the above method embodiment.

In addition, the memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the volatile or non-volatile storage device includes but is not limited to: a magnetic disk or optical disk, an electrically erasable programmable read-only memory, an erasable programmable read-only memory, a static access memory, a read-only memory, a magnetic memory, a flash memory, and a programmable read-only memory.

The above-mentioned computer device can be implemented as the terminal device in the above-mentioned various 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-mentioned computer device is implemented as the terminal device in each of the above-mentioned method embodiments,

The transceiver is used to restore or reestablish the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails;

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

When the above-mentioned computer device is implemented as a terminal device in the above-mentioned method embodiments, the process executed by the transceiver and/or the processor can refer to the steps executed by the terminal device in the scheme shown in Figure 2 or Figure 4 above, and will not be repeated here.

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

The transceiver 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;

The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition.

When the above-mentioned computer device is implemented as a network side device in the above-mentioned method embodiments, the process executed by the transceiver and/or the processor can refer to the steps executed by the network side device in the scheme shown in Figure 3 or Figure 4 above, and will not be repeated here.

An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. The computer program is loaded and executed by a processor to implement the steps performed by a terminal device in the method shown in Figure 2 or Figure 4 above; or, the computer program is loaded and executed by a processor to implement the steps performed by a network side device in the method shown in Figure 3 or Figure 4 above.

The present application also provides a computer program product or computer program, which includes 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 various steps performed by the terminal device in the method shown in Figure 2 or Figure 4 above; or, the processor executes the computer instructions so that the computer device executes to implement the various steps performed by the network side device in the method shown in Figure 3 or Figure 4 above.

The present application also provides a computer program, which includes computer instructions, which 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 executes the various steps performed by the terminal device in the method shown in Figure 2 or Figure 4 above; or, the processor executes the computer instructions so that the computer device executes to implement the various steps performed by the network side device in the method shown in Figure 3 or Figure 4 above.

The present application also provides a chip, which is used in a terminal device. The chip can execute the various steps in the method shown in Figure 2 or Figure 4 above, which are executed by the terminal device; or, the chip can execute the various steps in the method shown in Figure 3 or Figure 4 above, which are executed by the network side device.

Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims (66)

A connection establishment method, characterized in that the method is executed by a terminal device, and the method comprises: When the terminal device is in a dual connection state and the secondary cell group SCG connection fails, the secondary cell group SCG connection is restored or rebuilt through the first cell; The first cell is a cell for which corresponding target configuration information has been stored in the terminal device and which satisfies the 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 cells PSCell of CPA; Conditionally modify the configuration information of the target PSCell cell of CPC; Conditionally add the conditional switching trigger condition configuration information associated with the target PSCell cell of the CPA; And, conditionally modify the conditional switching trigger condition configuration information associated with the target PSCell cell of the CPC. The method according to claim 1 or 2 is characterized in that the first condition includes: a cell selection condition, a first measurement event, and at least one of the switching conditions in the conditional switching trigger condition configuration information. The method according to claim 3, characterized in that 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 a 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, characterized in that the first measurement event is configured in at least one of the following ways: Pre-set method, system broadcast message method or dedicated signaling method. The method according to any one of claims 1 to 5, characterized in that 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 comprises: When the terminal device is in a dual connection state and the SCG connection fails, starting a timer; Before the timer expires, the SCG connection is restored or reestablished through the first cell. The method according to claim 6, characterized in that, before the timer expires, restoring or reestablishing the SCG connection through the first cell comprises: Before the timer times out, the step of selecting the first cell to restore or reestablish the SCG connection is performed once; or, Before the timer times out, and the number of failures to restore or reestablish the SCG connection during the running of the timer is less than or equal to the first number threshold, the first cell is selected to restore or reestablish the SCG connection. The method according to claim 6, characterized in that the starting timer comprises: When the first SCG connection fails after the terminal device successfully receives a first reconfiguration message each time, starting a timer; the first reconfiguration message includes configuration information of a target PSCell cell of a CPA or CPC; Alternatively, each time the first SCG connection fails after the terminal device successfully receives a second reconfiguration message, a timer is started; the second reconfiguration message includes configuration information of adding a PSCell cell or modifying a PSCell cell; Alternatively, each time the terminal device successfully receives the third reconfiguration message and the first SCG connection fails, the timer is started; Alternatively, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, starting the timer; Alternatively, whenever an SCG connection failure occurs in the terminal device and the timer is not running, starting the timer; Alternatively, whenever an SCG connection failure occurs in the terminal device, the terminal device stores configuration information of at least one SCG cell and the timer is not running, the timer is started. The method according to any one of claims 1 to 5, characterized in that 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 comprises: When the terminal device is in a dual connection state and after the SCG connection fails, when the number of failures to restore or rebuild the SCG connection is less than or equal to a second number threshold, the first cell is selected to restore or rebuild the SCG connection. The method according to any one of claims 1 to 9, characterized in that the method further comprises: When the terminal device is in a dual connection state and the SCG connection fails, generating SCG connection failure report information; The SCG connection failure report information is processed according to the result of the SCG connection recovery or reconstruction. The method according to claim 10, characterized in that the processing of the SCG connection failure report information according to the result of SCG connection recovery or reconstruction comprises: When the timer times out, the terminal device reports SCG connection failure report information to the master 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 number 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 the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device deletes the previously stored SCG connection failure report information; When the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device reports SCG connection failure report information to the first cell successfully accessed; When the SCG connection is successfully reestablished or restored 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 reaches the fourth threshold, the terminal device reports SCG connection failure report information to the MCG. The method according to claim 11, characterized in that the reason for the timer timing out includes: During the running of the timer, the first cell satisfying the first condition is not selected; Alternatively, the first cell satisfying the first condition is selected during the running of the timer, and the first cell satisfying the first condition is not successfully accessed during the running of the timer. The method according to claim 11 or 12, characterized in that the method further comprises: When the timer times out, the terminal device deletes the stored configuration information of the target PSCell cell with at least one condition added or condition modified, and the conditional switching trigger condition configuration information associated with the target PSCell cell with the corresponding condition added or condition modified; Alternatively, when the timer times out, the terminal device deletes all stored configuration information related to the conditional switching. The method according to claim 11, characterized in that the reason for stopping the timer includes: A cell satisfying the first condition is selected during the operation of the timer, and a random access procedure is successfully completed with the first cell or uplink synchronization is successfully completed with the first cell before the timer times out; During the running of the timer, a cell satisfying the first condition is selected, and a reconfiguration completion message is successfully sent to the MCG or the first cell before the timer times out; An SCG connection failure occurs again during the operation of the timer; The number of SCG connection failures that occur during the operation of the timer reaches a fifth number threshold; During the operation of the timer, the configuration information of the target PSCell cell with conditional addition or conditional modification stored therein and the conditional switching triggering condition configuration information associated with the target PSCell cell with conditional addition or conditional modification are deleted; During the operation of the timer, the stored configuration information of the target PSCell cell with conditional addition or conditional modification, and the conditional switching trigger condition configuration information associated with the target PSCell cell with corresponding conditional addition or conditional modification become invalid; During the operation of the timer, a synchronization reconfiguration message for changing the MCG sent by the network device is received; During the operation of the timer, triggering an MCG radio link failure; During the operation of the timer, a timely switching configuration message sent by a network device is received; the timely switching configuration message is used to control the terminal device to immediately trigger an access process with a target PCell or a target PSCell. The method according to any one of claims 10 to 14, characterized in that the SCG connection failure cause in the SCG connection failure report information includes: The SCG connection reconstruction or recovery process is initiated when continuous SCG connection failures, conditional SCG switching failures, or a cell that meets the first condition is not selected. The method according to any one of claims 10 to 15 is characterized in that 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, characterized in that when the number of SCG connection failures is at least two, The processing of the SCG connection failure report information according to the result of the SCG connection recovery or reconstruction includes: Report the SCG connection failure report information of the most recent SCG connection failure; Alternatively, 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 most recent SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure; or, The SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice. The method according to any one of claims 1 to 18, characterized in that the method further comprises: When the SCG connection is successfully reestablished or restored through the selected first cell, the identification information or logical identification information of the designated SCG cell is reported to the MCG or the SCG that established the connection. The method according to claim 19, wherein the identification information or logical identification information of the designated SCG cell includes: The identification information or logical identification information of the SCG cell that has been successfully accessed; Identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell; Or, the identification information or logical identification information of the SCG cell to which access is successfully performed, and the identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell. The method according to any one of claims 1 to 20, characterized in that the method further comprises: Receive first indication information sent by a network device, where the first indication information is used to indicate whether the terminal device turns on the function of triggering SCG connection reconstruction or recovery. The method according to any one of claims 1 to 21, characterized in that the method further comprises: 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 reestablishing or restoring the SCG connection. An information receiving method, characterized in that the method is executed by a network side device, and the method comprises: Receiving 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; The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition. The method according to claim 23 is characterized in that 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 claim 23 or 24, characterized in that The SCG connection failure report information includes the SCG connection failure report information of the most recent 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, characterized in that, when the SCG connection failure report information includes the SCG connection failure report information of the most recent SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure; or, The SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice. The method according to any one of claims 23 to 26, characterized in that the method further comprises: Receive the identification information or logical identification information of the designated SCG cell reported by the terminal device to the MCG or the SCG that established the connection when the terminal device successfully reestablishes or restores the SCG connection through the selected first cell. The method according to claim 27, characterized in that the identification information or logical identification information of the designated SCG cell includes: The identification information or logical identification information of the SCG cell to which the terminal device successfully accesses; Identification information or logical identification information of at least one SCG cell in which an SCG connection failure occurred before the terminal device successfully accessed the SCG cell; Alternatively, the identification information or logical identification information of the SCG cell to which the terminal device successfully accesses, and the identification information or logical identification information of at least one SCG cell in which SCG connection failure occurred before successfully accessing the SCG cell. The method according to any one of claims 23 to 28, characterized in that the method further comprises: A first indication message is sent to the terminal device, where the first indication message is used to indicate whether the terminal device turns on a function of triggering SCG connection reconstruction or recovery. The method according to any one of claims 23 to 29, characterized in that the method further comprises: 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 reestablishing or restoring the SCG connection. A connection establishment device, characterized in that the device comprises: A connection module, used for recovering or reestablishing the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails; The first cell is a cell for which corresponding target configuration information has been stored in the terminal device and which satisfies the first condition. The device according to claim 31, characterized in that the target configuration information includes at least one of the following information: Conditionally add the configuration information of the target primary and secondary cells PSCell of CPA; Conditionally modify the configuration information of the target PSCell cell of CPC; Conditionally add the conditional switching trigger condition configuration information associated with the target PSCell cell of the CPA; And, conditionally modify the conditional switching trigger condition configuration information associated with the target PSCell cell of the CPC. The device according to claim 32 is characterized in that the first condition includes: a cell selection condition, a first measurement event, and at least one of the switching conditions in the conditional switching 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 a 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 apparatus according to claim 33 or 34, wherein the first measurement event is configured in at least one of the following ways: Pre-set method, system broadcast message method or dedicated signaling method. The device according to any one of claims 31 to 35, characterized in that the connection module is used to: When the terminal device is in a dual connection state and the SCG connection fails, starting a timer; Before the timer expires, the SCG connection is restored or reestablished through the first cell. The device according to claim 36, characterized in that the connection module is used to: Before the timer times out, the step of selecting the first cell to restore or reestablish the SCG connection is performed once; or, Before the timer times out, and the number of failures to restore or reestablish the SCG connection during the running of the timer is less than or equal to the first number threshold, the first cell is selected to restore or reestablish the SCG connection. The device according to claim 36, characterized in that the connection module is used to: When the first SCG connection fails after the terminal device successfully receives a first reconfiguration message each time, starting a timer; the first reconfiguration message includes configuration information of a target PSCell cell of a CPA or CPC; Alternatively, each time the first SCG connection fails after the terminal device successfully receives a second reconfiguration message, a timer is started; the second reconfiguration message includes configuration information of adding a PSCell cell or modifying a PSCell cell; Alternatively, each time the terminal device successfully receives the third reconfiguration message and the first SCG connection fails, the timer is started; Alternatively, when the first SCG connection fails after the terminal device successfully accesses an SCG cell each time, starting the timer; Alternatively, whenever an SCG connection failure occurs in the terminal device and the timer is not running, starting the timer; Alternatively, whenever an SCG connection failure occurs in the terminal device, the terminal device stores configuration information of at least one SCG cell and the timer is not running, the timer is started. The device according to any one of claims 31 to 35, characterized in that The connection module is used to select the first cell to restore or rebuild the SCG connection when the terminal device is in a dual connection state and after the SCG connection fails, the number of failures to restore or rebuild the SCG connection is less than or equal to a second number threshold. The device according to any one of claims 31 to 39, characterized in that the device further comprises: A report generation module, used for generating 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 used to process the SCG connection failure report information according to the result of SCG connection recovery or reconstruction. The device according to claim 40, characterized in that the report processing module is used to: When the timer times out, the terminal device reports the SCG connection failure report information to the master 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 number 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 the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device deletes the previously stored SCG connection failure report information; When the SCG connection is successfully reestablished or restored through the selected first cell, the terminal device reports SCG connection failure report information to the first cell successfully accessed; When the SCG connection is successfully reestablished or restored 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 reaches the fourth threshold, the terminal device reports SCG connection failure report information to the MCG. The device according to claim 41, characterized in that the reason for the timer timing out includes: During the running of the timer, the first cell satisfying the first condition is not selected; Alternatively, the first cell satisfying the first condition is selected during the running of the timer, and the first cell satisfying the first condition is not successfully accessed during the running of the timer. The device according to claim 41 or 42, characterized in that the device further comprises: a deletion module, configured to: When the timer times out, the terminal device deletes the stored configuration information of the target PSCell cell with at least one condition added or condition modified, and the conditional switching trigger condition configuration information associated with the target PSCell cell with the corresponding condition added or condition modified; Alternatively, when the timer times out, the terminal device deletes all stored configuration information related to the conditional switching. The device according to claim 41, characterized in that the reason for stopping the timer includes: A cell satisfying the first condition is selected during the operation of the timer, and a random access procedure is successfully completed with the first cell or uplink synchronization is successfully completed with the first cell before the timer times out; During the running of the timer, a cell satisfying the first condition is selected, and a reconfiguration completion message is successfully sent to the MCG or the first cell before the timer times out; An SCG connection failure occurs again during the operation of the timer; The number of SCG connection failures that occur during the operation of the timer reaches a fifth number threshold; During the operation of the timer, the configuration information of the target PSCell cell with conditional addition or conditional modification stored therein and the conditional switching triggering condition configuration information associated with the target PSCell cell with conditional addition or conditional modification are deleted; During the operation of the timer, the stored configuration information of the target PSCell cell with conditional addition or conditional modification, and the conditional switching trigger condition configuration information associated with the target PSCell cell with corresponding conditional addition or conditional modification become invalid; During the operation of the timer, a synchronization reconfiguration message for changing the MCG sent by the network device is received; During the operation of the timer, triggering an MCG radio link failure; During the operation of the timer, a timely switching configuration message sent by a network device is received; the timely switching configuration message is used to control the terminal device to immediately trigger an access process with a target PCell or a target PSCell. The device according to any one of claims 40 to 44, characterized in that the SCG connection failure cause in the SCG connection failure report information includes: The SCG connection reconstruction or recovery process is initiated when continuous SCG connection failures, conditional SCG switching failures, or a cell that meets the first condition is not selected. According to any one of claims 40 to 45, the device is characterized in that the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs. The device according to any one of claims 40 to 46, characterized in that when the number of SCG connection failures is at least two, The report processing module is used to: Report the SCG connection failure report information of the most recent SCG connection failure; Alternatively, report SCG connection failure report information of at least two SCG connection failures. The device according to claim 47, characterized in that, in the case of reporting the SCG connection failure report information of the most recent SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure; or, The SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice. The device according to any one of claims 31 to 48, characterized in that the device further comprises: The identification reporting module is used to report the identification information or logical identification information of the specified SCG cell to the MCG or the SCG that establishes the connection when the SCG connection is successfully rebuilt or restored through the selected first cell. The apparatus according to claim 49, wherein the identification information or logical identification information of the designated SCG cell comprises: The identification information or logical identification information of the SCG cell that has been successfully accessed; Identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell; Or, the identification information or logical identification information of the SCG cell to which access is successfully performed, and the identification information or logical identification information of at least one SCG cell where SCG connection failure occurred before successful access to the SCG cell. The device according to any one of claims 31 to 50, characterized in that the device further comprises: The indication receiving module is used to receive the first indication information sent by the network device, and the first indication information is used to indicate whether the terminal device turns on the function of triggering SCG connection reconstruction or recovery. The device according to any one of claims 31 to 51, characterized in that the device further comprises: An indication sending module is used to send capability indication information to a network device, wherein the capability indication information is used to indicate whether the terminal device supports the function of reestablishing or restoring the SCG connection. An information receiving device, characterized in that the device comprises: A receiving module, 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; The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition. The device according to claim 53 is characterized in that the SCG connection failure report information includes: identification information or logical identification information of the cell where the SCG connection failure occurs. The device according to claim 53 or 54, characterized in that The SCG connection failure report information includes the SCG connection failure report information of the most recent 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, characterized in that, when the SCG connection failure report information includes the SCG connection failure report information of the most recent SCG connection failure, The SCG connection failure report information includes the identification information or logical identification information of the SCG cell of the most recent SCG connection failure; or, The SCG connection failure report information includes identification information or logical identification information of the SCG cell where the SCG connection failed at least twice. The device according to any one of claims 53 to 56 is characterized in that the receiving module is also used to receive the identification information or logical identification information of the designated SCG cell reported by the terminal device to the MCG or the SCG that established the connection when the terminal device successfully reestablishes or restores the SCG connection through the selected first cell. The apparatus according to claim 57, wherein the identification information or logical identification information of the designated SCG cell comprises: The identification information or logical identification information of the SCG cell to which the terminal device successfully accesses; Identification information or logical identification information of at least one SCG cell in which an SCG connection failure occurred before the terminal device successfully accessed the SCG cell; Alternatively, the identification information or logical identification information of the SCG cell to which the terminal device successfully accesses, and the identification information or logical identification information of at least one SCG cell in which SCG connection failure occurred before successfully accessing the SCG cell. The device according to any one of claims 53 to 58, characterized in that the device further comprises: A sending module is used to send a first indication message to the terminal device, wherein the first indication message is used to indicate whether the terminal device turns on a function of triggering SCG connection reconstruction or recovery. The device according to any one of claims 53 to 59 is characterized in that the receiving module is also used to receive capability indication information sent by the terminal device, and the capability indication information is used to indicate whether the terminal device supports the function of SCG connection reconstruction 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 used to restore or reestablish the secondary cell group SCG connection through the first cell when the terminal device is in a dual connection state and the secondary cell group SCG connection fails; The first cell is a cell for which corresponding target configuration information has been stored in the terminal device and which satisfies the 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; The SCG connection recovery or reconstruction process is performed through the first cell, which is a cell in which the corresponding target configuration information has been stored in the terminal device and meets the first condition. A computer-readable storage medium, characterized in that 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 as described in any one of claims 1 to 22, or to 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, which are stored in a computer-readable storage medium; a processor of a computer device executes the computer instructions, so that the computer device executes the connection establishment method as described in any one of claims 1 to 22, or implements the information receiving method as described in any one of claims 23 to 30. A computer program, characterized in that the computer program includes computer instructions, and a processor of a computer device executes the computer instructions, so that the computer device executes the connection establishment method as described in any one of claims 1 to 22, or implements the information receiving method as described in any one of claims 23 to 30. A chip, characterized in that the chip is used to execute the connection establishment method as described in any one of claims 1 to 22, or to implement the information receiving method as described in any one of claims 23 to 30.