Connection recovery systems, methods, apparatuses, devices, and computer-readable storage media

Abstract

The present disclosure provides a connection recovery system, method, device, equipment and computer readable storage medium, relating to the technical field of communication, wherein the connection recovery system in the present disclosure can include a plurality of network elements, the plurality of network elements including a first network element and a second network element, wherein the first network element is a network element that serves a user terminal before the second network element, and the second network element is a network element to be connected with the user terminal; the first network element stores user terminal UE context information to a persistent storage device after triggering the user terminal connection suspension; the persistent storage device is a device different from the first network element; the second network element acquires the user terminal UE context information from the persistent storage device in response to receiving a connection recovery request sent by the user terminal, and recovers the connection with the user terminal by using the user terminal context information. The present disclosure can reduce the coupling degree between network elements in the connection recovery process.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and in particular, to a connection recovery system, method, device, equipment and computer readable storage medium. BACKGROUND

[0002] At present, by reforming the service architecture of the 5th Generation Mobile Communication Technology (5G) core network, cloudification and service have become an important direction for the evolution of the access network to the 6th Generation Mobile Communication Technology (6G), and network elements and user terminals (UE) have also become important content in the development of cloudification and service. SUMMARY

[0003] The purpose of the present disclosure is to provide a connection recovery system, method, device, equipment and computer readable storage medium to reduce the coupling degree between network elements in the connection recovery process. The specific technical solutions are as follows:

[0004] In a first aspect, the present disclosure provides a connection recovery system, comprising a plurality of network elements, the plurality of network elements comprising a first network element and a second network element, wherein the first network element is a network element that has served the user terminal before the second network element, and the second network element is a network element to be connected with the user terminal;

[0005] The first network element stores user terminal UE context information to a persistent storage device after triggering user terminal connection suspension; the persistent storage device is a device different from the first network element;

[0006] The second network element acquires user terminal UE context information from the persistent storage device in response to receiving a connection recovery request sent by the user terminal, and recovers connection with the user terminal using the user terminal context information.

[0007] Optionally, the second network element is further configured to update the UE context information in response to changes in the user terminal location and / or state, and store the updated UE context information to the persistent storage device.

[0008] Optionally, the second network element is further configured to instruct the persistent storage device to delete the UE context information after the connection with the user terminal is recovered.

[0009] Optionally, the second network element is specifically configured to acquire user equipment (UE) context information from a persistent storage device in response to receiving a radio resource control (RRC) resume request sent by the user terminal in an rrc_inactive state, wherein the UE context information comprises context information stored by the first network element when triggering the user terminal to enter the rrc_inactive state.

[0010] Optionally, the second network element is specifically configured to acquire user equipment (UE) context information from a user context database (UCDB).

[0011] In a second aspect, the present disclosure provides a connection resumption method applied to a second network element, which is a network element to be connected with a user terminal, and the method comprises:

[0012] acquiring user equipment (UE) context information from a persistent storage device, wherein the UE context information is stored in the persistent storage device by a first network element after triggering a connection suspension of the user terminal, the first network element is a network element serving the user terminal before the second network element, and the persistent storage device is a device different from the first network element;

[0013] resuming connection with the user terminal by using the UE context information.

[0014] Optionally, the method further comprises:

[0015] updating the UE context information in response to a change in a location and / or a state of the user terminal, and storing the updated UE context information in the persistent storage device.

[0016] Optionally, the method further comprises:

[0017] in response to completion of the connection resumption with the user terminal, instructing the persistent storage device to delete the UE context information.

[0018] Optionally, the acquiring of the UE context information from the persistent storage device comprises:

[0019] acquiring user equipment (UE) context information from a persistent storage device in response to receiving a radio resource control (RRC) resume request sent by the user terminal in an rrc_inactive state, wherein the UE context information comprises context information stored by the first network element when triggering the user terminal to enter the rrc_inactive state.

[0020] Optionally, the obtaining the user terminal UE context information from the persistent storage device comprises:

[0021] obtaining the user terminal UE context information from a user context database UCDB.

[0022] In a third aspect, the present disclosure provides a connection resumption method applied to a user terminal, comprising:

[0023] sending a connection resumption request to a second network element, the connection resumption request being used to trigger the second network element to obtain user terminal UE context information from a persistent storage device and resume connection with the user terminal by using the user terminal context information, wherein the UE context information is stored to the persistent storage device by a first network element after triggering connection suspension of the user terminal, the first network element being a network element serving the user terminal before the second network element, and the persistent storage device being a device different from the first network element;

[0024] resuming connection with the second network element.

[0025] Optionally, the method further comprises:

[0026] in response to detecting a change in user location and / or state, sending a notification area RNA update request to the second network element, the RNA update request triggering the second network element to update the UE context information and store the updated UE context information to the persistent storage device.

[0027] Optionally, the method further comprises:

[0028] sending a UE connection resumption completion message to the second network element, the UE connection resumption completion message being used to trigger the second network element to instruct the persistent storage device to delete the UE context information.

[0029] Optionally, the method further comprises:

[0030] in response to receiving a connection suspension message sent by the first network element, entering an inactive state rrc_inactive, the connection suspension message being sent by the first network element to the user terminal when detecting that there is no service for the user terminal within a preset time period;

[0031] the connection resumption request comprises a radio resource control RRC resumption request;

[0032] the sending the connection resumption request to the second network element comprises:

[0033] in response to being in the inactive state rrc_inactive, sending a radio resource control RRC resumption request to the second network element.

[0034] In a fourth aspect, the present disclosure provides a connection resumption apparatus applied to a second network element, the second network element being a network element to be connected with a user terminal, the apparatus comprising:

[0035] an obtaining module configured to obtain user terminal (UE) context information from a persistent storage device, wherein the UE context information is stored in the persistent storage device by a first network element after triggering connection suspension of the user terminal, the first network element being a network element serving the user terminal before the second network element, and the persistent storage device being a device different from the first network element;

[0036] a resumption module configured to resume connection with the user terminal by using the UE context information.

[0037] Optionally, the apparatus further comprises:

[0038] an updating module configured to update the UE context information in response to a change in location and / or state of the user terminal, and store the updated UE context information in the persistent storage device.

[0039] Optionally, the apparatus further comprises:

[0040] an indication deletion module configured to instruct the persistent storage device to delete the UE context information in response to completion of connection resumption with the user terminal.

[0041] Optionally, the obtaining module is specifically configured to obtain the UE context information from the persistent storage device in response to receiving a radio resource control (RRC) resumption request sent by the user terminal, the RRC resumption request being sent by the user terminal in an rrc_inactive state, and the UE context information comprising context information stored by the first network element when triggering the user terminal to enter the rrc_inactive state.

[0042] Optionally, the obtaining module is specifically configured to obtain the UE context information from a user context database (UCDB).

[0043] In a fifth aspect, the present disclosure provides a connection resumption apparatus applied to a user terminal, comprising:

[0044] The sending recovery request module is configured to send a connection recovery request to the second network element, where the connection recovery request is used to trigger the second network element to obtain user equipment (UE) context information from the persistent storage device and restore the connection with the user equipment by using the user equipment context information, the UE context information is stored in the persistent storage device by the first network element after triggering the user equipment connection suspension, the first network element is a network element that serves the user equipment before the second network element, and the persistent storage device is a device different from the first network element.

[0045] The connection module is configured to restore the connection with the second network element.

[0046] Optionally, the apparatus further includes:

[0047] The sending update request module is configured to send a notification area (RNA) update request to the second network element in response to detecting a user location and / or state change, where the RNA update request triggers the second network element to update the UE context information and store the updated UE context information in the persistent storage device.

[0048] Optionally, the apparatus further includes:

[0049] The sending connection completion module is configured to send a UE connection recovery completion message to the second network element, where the UE connection recovery completion message is used to trigger the second network element to instruct the persistent storage device to delete the UE context information.

[0050] Optionally, the apparatus further includes:

[0051] The entering module is configured to enter an inactive state (rrc_inactive) in response to receiving a connection suspension message sent by the first network element, where the connection suspension message is sent by the first network element to the user equipment when the first network element detects that there is no service for the user equipment within a preset time period.

[0052] The connection recovery request includes a radio resource control (RRC) recovery request.

[0053] The sending recovery request module is specifically configured to send an RRC recovery request to the second network element in response to being in the inactive state (rrc_inactive).

[0054] The present disclosure also provides an electronic device including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus.

[0055] The memory is configured to store a computer program.

[0056] A processor for executing a program stored on a memory to implement the method steps of the second aspect or the third aspect.

[0057] The present disclosure also provides a computer readable storage medium having a computer program stored therein, the computer program, when executed by a processor, implements the method steps of the second aspect or the third aspect.

[0058] The present disclosure also provides a computer program product comprising instructions which, when executed on a computer, cause the computer to carry out the method of the second aspect or the third aspect.

[0059] In the present disclosure, when the second network element is to be restored to connect with the user terminal, the UE context information of the user terminal can be obtained from the persistent storage device, and the UE context information is used to restore the connection with the user terminal, and no signaling interaction is required between the second network element and the first network element in the connection restoration process, thereby reducing the coupling degree between the network elements in the connection restoration process.

[0060] Of course, implementing any product or method of the present disclosure does not necessarily require all the advantages described above to be achieved at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other embodiments can also be obtained by those skilled in the art based on these drawings.

[0062] Figure 1 The structural schematic diagram of the connection restoration system provided by the embodiments of the present disclosure;

[0063] Figure 2 The flowchart of the connection restoration method applied to the second network element in the embodiments of the present disclosure;

[0064] Figure 3 The flowchart of the connection restoration method applied to the user terminal in the embodiments of the present disclosure;

[0065] Figure 4 The signaling flowchart of the connection restoration in the related art;

[0066] Figure 5 The signaling flowchart of the information update in the related art;

[0067] Figure 6 The information interaction schematic diagram in the embodiments of the present disclosure;

[0068] Figure 7A structural schematic diagram of the connection recovery device applied to the second network element provided by the embodiment of the present disclosure is shown in FIG. 1.

[0069] Figure 8 Another structural schematic diagram of the connection recovery device applied to the second network element provided by the embodiment of the present disclosure is shown in FIG. 2.

[0070] Figure 9 Still another structural schematic diagram of the connection recovery device applied to the second network element provided by the embodiment of the present disclosure is shown in FIG. 3.

[0071] Figure 10 A structural schematic diagram of the connection recovery device applied to the user terminal provided by the embodiment of the present disclosure is shown in FIG. 4.

[0072] Figure 11 Another structural schematic diagram of the connection recovery device applied to the user terminal provided by the embodiment of the present disclosure is shown in FIG. 5.

[0073] Figure 12 Still another structural schematic diagram of the connection recovery device applied to the user terminal provided by the embodiment of the present disclosure is shown in FIG. 6.

[0074] Figure 13 Still another structural schematic diagram of the connection recovery device applied to the user terminal provided by the embodiment of the present disclosure is shown in FIG. 7.

[0075] Figure 14 A structural schematic diagram of the electronic device for implementing the connection recovery method applied to the second network element in the embodiment of the present disclosure is shown in FIG. 8.

[0076] Figure 15 A structural schematic diagram of the electronic device for implementing the connection recovery method applied to the second network element in the embodiment of the present disclosure is shown in FIG. 9. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art based on the present disclosure are within the scope of protection of the present disclosure.

[0078] Although the current 5G standard also introduces a separation structure on the wireless access side, since the access side network element needs to maintain the state of the network element that previously provides services to the user terminal, the binding between the network elements is still difficult to be released, and the association between these network elements brings signaling redundancy and increases the obstacles for independent scheduling and dynamic expansion and contraction.

[0079] In the 6G era, cloud network convergence puts higher requirements on the network, and realizing network service architecture to allow independent network element implementation, deployment, elastic scaling and customization is an important development direction.

[0080] The connection recovery system provided by the embodiments of the present disclosure can be applied to the field of wireless communication, or can also be applied to the field of terminals.

[0081] The connection recovery system provided by the embodiments of the present disclosure can include a plurality of network elements, and the plurality of network elements include a first network element and a second network element.

[0082] The first network element stores UE context information to a persistent storage device after triggering the suspension of the connection of the user terminal; the persistent storage device is a device different from the first network element;

[0083] The second network element obtains the UE context information from the persistent storage device in response to the connection recovery request sent by the user terminal, and recovers the connection with the user terminal by using the UE context information.

[0084] In the embodiments of the present disclosure, when the second network element is to be connected with the user terminal, the UE context information of the user terminal can be obtained from the persistent storage device, and the connection with the user terminal is recovered by using the UE context information. In the process of recovering the connection, signaling interaction is not required between the second network element and the first network element, thereby reducing the coupling degree between the network elements in the process of recovering the connection.

[0085] For example, the first network element is the last network element serving the user terminal before the second network element, which can also be referred to as the previous network element, such as network element A, and the second network element can be referred to as the current network element, such as network element B. Network element A triggers the suspension of the connection of the user terminal, and stores the UE context information, which can also be understood as being stored outside network element A. In this way, when network element B is to be connected with the user terminal, the UE context information is directly obtained from the persistent storage device, and the connection with the user terminal is recovered by using the UE context information. In the process of recovering the connection, signaling interaction is not required between network element B and network element A, thereby reducing the coupling degree between the network elements.

[0086] Figure 1 A structural diagram of the connection recovery system provided by the embodiments of the present disclosure is shown in FIG. 1. Figure 1 The connection recovery system provided by the embodiments of the present disclosure can include a plurality of network elements, and the plurality of network elements include a first network element 101 and a second network element 102.

[0087] The first network element 101 is a network element serving a user terminal before the second network element 102, and the second network element 102 is a network element to be connected with the user terminal.

[0088] The first network element 101 stores the UE context information into the persistent storage device 103 in response to triggering the suspension of the connection of the user terminal.

[0089] The persistent storage device 103 is a device different from the first network element 101.

[0090] The second network element 102 acquires the UE context information from the persistent storage device 103 in response to receiving the connection resumption request sent by the user terminal, and resumes the connection with the user terminal by using the UE context information.

[0091] The UE context information can be understood as a service profile of the user terminal, and can include link information for establishing the connection between the first network element and the user terminal, such as authentication information, negotiated security algorithm, generated key, created connection information such as Access Point Name (APN) and QoS Class Identifier (QCI) for measuring the packet forwarding behavior of the service data flow, and bearer information such as control plane and user plane address, etc.

[0092] The first network element 101 stores the UE context information into the persistent storage device 103, which can also be understood as persistently storing the UE context information.

[0093] The persistent storage can be understood as storing the UE context information into a device different from the first network element 101.

[0094] For connection resumption of the user terminal, for example, the user terminal moves into the service area of the second network element 102, which is a network element to be used to provide service to the user terminal. The user terminal sends a connection resumption request to the second network element 102. The second network element 102 receives the connection resumption request sent by the user terminal, acquires the UE context information from the persistent storage device 103, and resumes the connection with the user terminal by using the UE context information.

[0095] In an implementation manner, the first network element 101 can store the UE context information into a persistent database, for example, a User Context Data Base (UCDB). In this way, the second network element 102, after receiving the connection resumption request sent by the user terminal, can acquire the UE context information from the UCDB.

[0096] The UE context information corresponding to multiple user terminals can be uniformly stored in the UCDB. Specifically, the identifier of the user terminal can be taken as an index, and for each user terminal, the UE context information of the user terminal can be stored under the index of the identifier of the user terminal, so as to distinguish the UE context information corresponding to different user terminals stored in the UCDB.

[0097] After the first network element 101 is started, the UCDB is established first. For example, after the cloud network is started, the devices in the cloud network, such as the first network element 101, establish the UCDB in the same platform (i.e., the cloud network). The service areas provided by the network elements in the cloud network, such as tracking areas (TA) and ran-based notification areas (RNA), are collected, that is, the UE context information of the user terminals in multiple service areas is collected, and the UE context information of the user terminals in multiple service areas is stored in the UCDB.

[0098] During the running of the first network element 101, the first network element 101 can trigger suspension of the connection with a user terminal. For example, the first network element detects that a user terminal has no service for a period of time, at this time, the first network element 101 sends a connection suspension message to the user terminal, and the connection between the first network element 101 and the user is suspended. In this case, the first network element 101 can store the UE context information of the user terminal in the UCDB under the corresponding index, and then the first network element 101 releases the UE context information.

[0099] The embodiments of the present disclosure do not require the second network element 102 to perform signaling interaction with the first network element 101. When the second network element 102 resumes the connection with the user terminal, the UE context information of the user terminal can be obtained from the persistent storage device, and the UE context information is used to resume the connection with the user terminal, so as to reduce the coupling between the network elements, thereby reducing the association degree between the network elements, saving the signaling overhead, and reducing the processing delay.

[0100] In some embodiments, the second network element 102 is specifically configured to obtain the UE context information from the persistent storage device 103 in response to receiving a radio resource control (RRC) resume request sent by the user terminal.

[0101] The RRC resume request is sent by the user terminal in an inactive state rrc_inactive, and the UE context information includes the context information stored by the first network element 101 when triggering the user terminal to enter the inactive state rrc_inactive.

[0102] For example, the first network element 101 detects that the user terminal has no service for a period of time, and then sends a connection suspension message, i.e., an RRC Release with suspendconfig message, to the user terminal, triggering the user terminal to enter an rrc_inactive state and saving the UE context information of the user terminal to the persistent storage device 103, such as a UCDB.

[0103] When the UE performs connection resumption, for example, the UE moves into the service area of the second network element 102, the user terminal sends an RRC resume request, i.e., an RRC Resume Request, to the second network element 102, the second network element 102 receives the RRC resume request, obtains the UE context information from the persistent storage device 103, such as a UCDB, and resumes the connection with the user terminal by using the UE context information.

[0104] In the embodiments of the present disclosure, the UE context information of the user terminals in different areas is respectively stored in the persistent storage device, so that when the connection resumption of the user terminal is performed, when the connection with the user terminal is to be resumed, the second network element can directly obtain the UE context information from the persistent storage device to resume the connection with the user terminal, thereby reducing the complexity of the implementation of the network element and the coupling degree between the network elements.

[0105] In some embodiments, the second network element 102 is further configured to instruct the persistent storage device 103 to delete the UE context information in response to the completion of the connection resumption with the user terminal.

[0106] The second network element 102 resumes the connection with the user terminal by using the UE context information. After the completion of the connection resumption of the user terminal, the second network element 102 can receive a connection resumption completion message, and in response to the connection resumption completion message, instruct the persistent storage device to delete the UE context information.

[0107] On the one hand, compared with the related art, after the completion of the connection resumption of the user terminal with the second network element, the second network element needs to interact with the first network element to instruct the first network element to delete the UE context information, the second network element in the embodiments of the present disclosure instructs the persistent storage device to delete the UE context information in response to the completion of the connection resumption with the user terminal, thereby reducing the coupling degree between the network elements in the context release process, reducing the signaling interaction in the context release process, and saving the context release time length. On the other hand, the storage space of the persistent storage device can also be saved.

[0108] In some embodiments, the second network element 102 is further configured to update the UE context information in response to the change of the location and / or state of the user terminal, and store the updated UE context information to the persistent storage device 103.

[0109] In a simple understanding, in response to the change of the user terminal location and / or state, the second network element 102 directly updates the UE context information and stores the updated UE context information in the persistent storage device.

[0110] When the user terminal location and / or state changes, the second network element 102 synchronously updates the UE context information of the user terminal in the UCDB. Specifically, when the user terminal location and / or state changes, the user terminal sends an update request, such as an “RRC Resume Request (RNA update)” message, to the second network element 102, and the second network element 102 updates the UE context information in the persistent storage device, such as the UCDB, after receiving the update request. For example, the state change of the user terminal triggers the update of the corresponding notification area RNA of the user terminal, and the second network element 102 can directly update the UE context information in the UCDB according to the “RRC Resume Request (RNA update)” message.

[0111] In the UE context information updating process of the embodiments of the present disclosure, the second network element does not need to interact with the first network element, which reduces the coupling between the network elements in the UE context updating process and reduces the signaling interaction between the network elements.

[0112] The embodiments of the present disclosure provide a connection resumption method, which can be applied to a second network element, the second network element being a network element to be connected with a user terminal, and the method comprises the following steps:

[0113] The second network element obtains the UE context information from the persistent storage device, wherein the UE context information is stored in the persistent storage device by a first network element after triggering the suspension of the connection of the user terminal, the first network element being a network element serving the user terminal before the second network element, and the persistent storage device being a device different from the first network element;

[0114] The second network element resumes the connection with the user terminal by using the UE context information of the user terminal.

[0115] In the embodiments of the present disclosure, when the second network element is to resume the connection of the user terminal, the second network element can obtain the UE context information of the user terminal from the persistent storage device and resume the connection with the user terminal by using the UE context information. In the connection resumption process, the second network element does not need to interact with the first network element, which reduces the coupling between the network elements in the connection resumption process.

[0116] Figure 2 The flowchart of the connection resumption method applied to the second network element in the embodiments of the present disclosure is shown in FIG. 6. Referring to FIG. 6, Figure 2 The connection resumption method applied to the second network element in the embodiments of the present disclosure can comprise the following steps:

[0117] S201, the second network element obtains the UE context information from the persistent storage device.

[0118] The UE context information is stored by the first network element to the persistent storage device after triggering the user terminal connection suspension.

[0119] The first network element is a network element that previously served the user terminal, and the persistent storage device is a device different from the first network element.

[0120] S202, the second network element resumes the connection with the user terminal by using the UE context information.

[0121] After the connection is resumed for the user terminal, for example, the user terminal moves to the service area of the second network element. The user terminal sends a connection resume request to the second network element, the second network element receives the connection resume request sent by the user terminal, obtains the UE context information from the persistent storage device, and resumes the connection with the user terminal by using the UE context information of the user terminal.

[0122] In an implementation manner, the first network element can store the UE context information in a persistent database, for example, a UCDB. UE context information corresponding to a plurality of user terminals can be uniformly stored in the UCDB. Specifically, the identifier of the user terminal can be used as an index, and for each user terminal, the UE context information of the user terminal is stored under the index of the identifier of the user terminal, so as to distinguish the UE context information corresponding to different user terminals stored in the UCDB.

[0123] In this way, the second network element can obtain the UE context information from the UCDB. Specifically, the second network element receives the connection resume request sent by the user terminal, and obtains the UE context information from the UCDB. For example, the UE context information of the user terminal is obtained from the UCDB according to the identifier of the user terminal.

[0124] In some embodiments, S201 can include:

[0125] In response to receiving the RRC resume request sent by the user terminal, the second network element obtains the UE context information from the persistent storage device.

[0126] The RRC resume request is sent by the user terminal in the inactive state rrc_inactive.

[0127] The UE context information includes context information stored by the first network element when triggering the user terminal to enter the inactive state rrc_inactive.

[0128] For example, the first network element detects that the user terminal has no service for a period of time, and then sends a connection suspension message RRC Release with suspendconfig message to the user terminal, triggers the user terminal to enter the radio resource control inactive state rrc_inactive, and saves the UE context information of the user terminal to a persistent storage device, such as a UCDB.

[0129] When the UE performs connection recovery, for example, the UE moves into the service area of the second network element, the user terminal sends an RRC resume request such as “RRC Resume Request” to the second network element, the second network element receives the RRC resume request, obtains the UE context information from the persistent storage device such as the UCDB, and recovers the connection with the user terminal by using the UE context information.

[0130] In the embodiments of the present disclosure, the context data of the user in the inactive state is persistently stored in different regions, and the network element state information is separated, that is, the UE context information of the user terminal in different regions is stored in the persistent storage device respectively. In this way, when the connection recovery is performed for the user terminal, the second network element can directly obtain the UE context information from the persistent storage to recover the connection with the user terminal, and the complexity of the network element implementation and the coupling degree between the network elements can be reduced.

[0131] In some embodiments, the connection recovery method provided by the embodiments of the present disclosure can further include:

[0132] In response to the change of the location and / or state of the user terminal, the second network element updates the UE context information and stores the updated UE context information to the persistent storage device.

[0133] In simple understanding, in response to the change of the location and / or state of the user terminal, the second network element directly updates the UE context information and stores the updated UE context information to the persistent storage device.

[0134] When the location and / or state of the user terminal changes, the second network element synchronously updates the UE context information of the user terminal in the UCDB. Specifically, when the location and / or state of the user terminal changes, the user terminal sends an update request such as “RRC Resume Request (RNA update)” message to the second network element, and the second network element updates the UE context information in the persistent storage device such as the UCDB in response to the update request. For example, the change of the state of the user terminal triggers the update of the notification area RNA corresponding to the user terminal, and the second network element can directly update the information in the UCDB according to the “RRC Resume Request (RNA update)” message.

[0135] In the UE context information updating process, the second network element does not need to interact with the first network element, the coupling between the network elements in the UE context updating process is reduced, and the signaling interaction between the network elements is reduced.

[0136] In some embodiments, the connection recovery method provided by the embodiments of the present disclosure can further include:

[0137] In response to completion of the connection recovery of the user terminal, the second network element instructs the persistent storage device to delete the UE context information.

[0138] After the connection recovery of the user terminal is completed, a connection recovery completion message can be sent to the second network element 102, and the second network element 102 receives the connection recovery completion message and instructs the persistent storage device to delete the UE context information.

[0139] In simple terms, after the user connection is recovered, the network element deletes the UE context information of the user terminal in the persistent storage device such as the UCDB.

[0140] On the one hand, compared with the related art, after the connection recovery of the user terminal and the second network element is completed, the first network element needs to interact with the first network element to instruct the first network element to delete the UE context information, the second network element of the embodiments of the present disclosure instructs the persistent storage device to delete the UE context information in response to the completion of the connection recovery of the user terminal, which reduces the coupling between the network elements in the release context process, reduces the signaling interaction in the release context process, and can also save the release processing time. On the other hand, the storage space of the persistent storage device can be saved.

[0141] The embodiments of the present disclosure also provide a connection recovery method, which can be applied to a user terminal and includes:

[0142] The user terminal sends a connection recovery request to the second network element, the connection recovery request being used to trigger the second network element to obtain UE context information from a persistent storage device and recover the connection with the user terminal by using the user terminal context information, wherein the UE context information is stored in the persistent storage device by a first network element after triggering the user terminal to suspend the connection, the first network element is a network element that serves the user terminal before the second network element, and the persistent storage device is a device different from the first network element;

[0143] The user terminal recovers the connection with the second network element.

[0144] In the embodiments of the present disclosure, when the second network element is to recover the connection of the user terminal, the UE context information of the user terminal can be obtained from the persistent storage device, and the connection with the user terminal is recovered by using the UE context information. In the connection recovery process, the second network element does not need to interact with the first network element, and the coupling between the network elements in the connection recovery process for the user terminal is reduced.

[0145] Figure 3 is a flowchart of a connection resumption method applied to a user terminal in the embodiments of the present disclosure. With reference to Figure 3 the connection resumption method applied to the user terminal in the embodiments of the present disclosure can include:

[0146] S301, the user terminal sends a connection resumption request to a second network element.

[0147] The connection resumption request is used to trigger the second network element to obtain UE context information from a persistent storage device and resume connection with the user terminal by using the user terminal context information.

[0148] The UE context information is stored by the first network element to the persistent storage device after triggering the user terminal to suspend connection, the first network element is a network element that serves the user terminal before the second network element, and the persistent storage device is a device different from the first network element.

[0149] S302, the user terminal resumes connection with the second network element.

[0150] The user terminal sends the connection resumption request to the second network element, so that the second network element receives the connection resumption request, obtains the UE context information of the user terminal from the persistent storage device such as the UCDB, and resumes connection with the user terminal by using the UE context information.

[0151] In some embodiments, the connection resumption method provided by the embodiments of the present disclosure can further include:

[0152] In response to receiving the connection suspension message sent by the first network element, the user terminal enters the inactive state rrc_inactive.

[0153] The connection suspension message is sent by the first network element to the user terminal when the first network element detects that the user terminal has no traffic for a preset time period, wherein the preset time period can be determined according to experience or actual demand.

[0154] The connection resumption request includes a radio resource control RRC resumption request.

[0155] S301 can include:

[0156] In response to being in the inactive state rrc_inactive, the user terminal sends a radio resource control RRC resumption request to the second network element.

[0157] The second network element receives the RRC resumption request sent by the user terminal, and obtains the UE context information of the user terminal from the persistent storage device such as the UCDB.

[0158] In some embodiments, the connection recovery method provided by the embodiments of the present disclosure can further include:

[0159] In response to detecting the change in the user location and / or state, the user terminal sends a notification area RNA update request to the second network element.

[0160] The RNA update request triggers the second network element to update the UE context information and store the updated UE context information to the persistent storage device.

[0161] When the user terminal location and / or state change, the user terminal sends an update request, such as an “RRCResume Request (RNA update)” message, to the second network element. In this way, when the second network element receives the update request, the UE context information in the persistent storage device, such as the UCDB, is updated. For example, the change in the state of the user terminal triggers the update of the notification area RNA corresponding to the user terminal, and the second network element can directly update the information in the UCDB according to the “RRCResume Request (RNA update)” message.

[0162] In the UE context information update process, the second network element does not need to interact with the first network element, which reduces the coupling between the network elements in the UE context update process and reduces the signaling interaction between the network elements.

[0163] In some embodiments, the connection recovery method provided by the embodiments of the present disclosure can further include:

[0164] The user terminal sends a UE connection recovery completion message to the second network element.

[0165] The UE connection recovery completion message is used to trigger the second network element to instruct the persistent storage device to delete the UE context information.

[0166] After the user terminal completes the connection recovery, the user terminal can send a connection recovery completion message to the second network element. In this way, when the second network element receives the connection recovery completion message, the second network element instructs the persistent storage device to delete the UE context information. In simple terms, after the user completes the connection recovery, the network element deletes the UE context information of the user terminal in the persistent storage device, such as the UCDB.

[0167] On the one hand, compared with the related art, after the user terminal and the second network element complete the connection recovery, the second network element needs to interact with the first network element to instruct the first network element to delete the UE context information. In the embodiments of the present disclosure, the second network element instructs the persistent storage device to delete the UE context information in response to the completion of the connection recovery with the user terminal, which reduces the coupling between the network elements in the context release process, reduces the signaling interaction in the context release process, and saves the context release processing time. On the other hand, the storage space of the persistent storage device can be saved.

[0168] In order to more clearly understand the connection recovery process of the embodiments of the present disclosure, the signaling flow of the connection recovery process in the related art and the signaling flow of the connection recovery process provided by the embodiments of the present disclosure are compared and described below.

[0169] Figure 4 The signaling flow diagram of the connection recovery in the related art is shown in FIG. 2. In the figure, the base station gNB can be understood as a network element to be served for the user terminal, that is, a second network element, which can also be referred to as a current network element, and the base station gNBL can be understood as a network element that serves the user terminal before the second network element, that is, a first network element, which can also be referred to as a last network element.

[0170] Referring to Figure 4 In the related art, the gNBL sends a connection suspension message: RRC Release with suspendconfig to the user terminal, the user terminal receives the connection suspension message, and the UE enters the rrc_inactive state / CM_CONNECTED. The UE in the rrc_inactive state / CM_CONNECTED sends an RRC resume request: RRC Resume Request to the gNB. The gNB receives the RRC Resume Request, sends a context retrieval request: retrieve UE context request to the gNBL, and the gNBL responds to the context retrieval request, that is, sends a response request: retrieve UE context response to the gNB. After the gNB receives the response request, the connection with the user terminal is resumed, that is, the RRC connection is resumed: RRC resume. After the user terminal resumes the RRC connection, it is in a connected state, such as UE in RRC_CONNECTED / CM_CONNECTED. In addition, after the user terminal resumes the RRC connection, it sends a connection completion message: RRC Resume Complete to the gNB. After the gNB receives the RRC Resume Complete, it sends a context release message: UE context release to the gNBL, instructing the gNBL to release the UE context.

[0171] Figure 5 The signaling flow diagram of the information update in the related art is shown in FIG. 3. Referring to Figure 5, gNBL sends a connection suspension message to the user terminal: RRC Release with suspendconfig, the user terminal receives the connection suspension message, and the UE enters the rrc_inactive state / CM_CONNECTED. The UE in the rrc_inactive state / CM_CONNECTED sends an update request to the gNB: RNA Update, the gNB receives the RNA Update, sends a context acquisition request to the gNBL: retrieve UEcontext request, the gNBL updates the UE context, and sends a response request to the gNB: retrieve UEcontext response, receives the gNB retrieve UE context response, and sends a release suspension indication to the user terminal: RRC release Suspend indication.

[0172] It can be seen that in the related art, in the user terminal connection recovery process, the gNB needs to interact with the gNBL to obtain the UE context information from the gNBL, and then the UE context information is used to recover the connection of the user terminal, and after the user terminal completes the connection recovery, the gNB also needs to interact with the gNBL to trigger the gNBL to release the UE context information. The RNA is updated, and the gNB also needs to interact with the gNBL to indicate the gNBL to update the UE context. When the UE is in the service range of a new network element (gNB) and triggers the connection recovery due to business or RNA update, the gNB needs to request the gNBL to rebuild the connection of the UE context information, and the UE action is completed. Then instruct the gNBL to release the context. In the connection recovery process, the UE context release process, and the information update process, the network elements are closely associated and have high coupling degree. The signaling interaction between the network elements is required, so that the implementation complexity between the network elements is high, and the processing time is also long.

[0173] Figure 6 The information interaction schematic diagram in the embodiment of the present disclosure is shown in FIG. 1. Referring to Figure 6 , the gNBL sends a connection suspension message to the user terminal: RRC Release with suspendconfig, and saves the context information of the user terminal to the UCDB, that is, UEContext Create, the gNBL releases the UE context information of the user terminal, that is, UE Context Release.

[0174] The user terminal sends a resumption request, RRC Resume Request, to the gNB, the gNB obtains the UE context information from the UCDB, i.e., UE context retrieve, the gNB resumes the connection with the user terminal by using the UE context information, RRCResume, after the user terminal completes the connection resumption, the user terminal sends a connection resumption completion message, RRC Resume Complete, to the gNB, and the gNB receives the connection resumption completion message and instructs the UCDB to delete the UE context information, i.e., triggers the deletion of the UE context, UE context Delete.

[0175] In addition, the state change of the user terminal triggers the update of the notification area RNA corresponding to the user terminal, RNA Update, the gNB directly updates the information in the UCDB, and the gNB triggers the update of the UE context, UE Context Update.

[0176] When the UE performs connection resumption, the gNB receives the RRC Resume Request message and directly extracts the user context data from the UCDB to resume the RRC connection. After the gNB receives the UE connection resumption completion message, the gNB instructs the UCDB to delete the UE context data. This not only saves the signaling overhead of requesting the context from the gNB L, but also reduces the implementation complexity and the degree of association of the gNB L and the gNB. The processing time is saved.

[0177] In addition, the gNB can directly update the information in the UCDB according to the RRC Resume Request (RNA update) message, without the gNB requesting the user context information from the gNB L to reestablish the connection, and then interacting with the gNB L to instruct the gNB L to update the information. The UE no longer needs to first resume the connection, signaling overhead is saved, and processing delay is reduced.

[0178] The embodiments of the present disclosure optimize the user connection resumption and RNA state update process in the standard specification, simplify the existing signaling process, reduce the control plane data overhead, and optimize the processing delay.

[0179] In order to fully exert the advantages of cloud network integration, the embodiments of the present disclosure introduce an effective network state maintenance method on the side of the radio access network, i.e., storing the UE context information in a persistent storage device. In this way, when connection resumption is performed for the user terminal, the second network element can directly obtain the UE context information from the persistent storage to resume the connection with the user terminal, so as to support the separation of network element functions and further simplify the network process, thereby reducing the degree of coupling between network elements.

[0180] The embodiments of the present disclosure persistently store and uniformly manage the UE context information of the UE entering the RRC Inactive state in the network element, so that the UE context information of the user terminal is saved outside the running network element instance. When the user terminal needs to restore the connection due to business or update, the UE context information in the persistent storage can be used to quickly restore the network connection in other network elements, which simplifies the signaling process between network elements, reduces the complexity of the network element instance, and improves the processing efficiency.

[0181] The embodiments of the present disclosure have good improvement effect on network performance, and meet the standardization direction of 6G. It can be written into the 6G standard as a universal implementation scheme. Any country or operator using 6G can adopt the connection recovery, information update and other methods provided by the embodiments of the present disclosure.

[0182] The embodiments of the present disclosure provide a connection recovery device, which is applied to a second network element, and the second network element is a network element to be connected with a user terminal, such as Figure 7 The device comprises:

[0183] The obtaining module 701 is configured to obtain the UE context information from the persistent storage device, wherein the UE context information is stored in the persistent storage device by a first network element after triggering the connection suspension of the user terminal, the first network element is a network element serving the user terminal before the second network element, and the persistent storage device is a device different from the first network element;

[0184] The recovery module 702 is configured to restore the connection with the user terminal by using the UE context information.

[0185] Optionally, as shown in Figure 8 The device further comprises:

[0186] The update module 801 is configured to update the UE context information in response to the change of the location and / or state of the user terminal, and store the updated UE context information in the persistent storage device.

[0187] Optionally, as shown in Figure 9 The device further comprises:

[0188] The indication deletion module 901 is configured to instruct the persistent storage device to delete the UE context information in response to the completion of the connection restoration with the user terminal.

[0189] Optionally, the obtaining module 701 is specifically configured to obtain the UE context information from the persistent storage device in response to receiving a radio resource control (RRC) resume request sent by the user terminal, the RRC resume request being sent by the user terminal in an inactive state (rrc_inactive), and the UE context information including context information stored by the first network element when triggering the user terminal to enter the inactive state (rrc_inactive).

[0190] Optionally, the obtaining module 701 is specifically configured to obtain the UE context information from a user context database (UCDB).

[0191] The embodiments of the present disclosure further provide a connection resumption apparatus applied to a user terminal, and as shown in Figure 10 may include:

[0192] The sending resumption request module 1001 is configured to send a connection resumption request to the second network element, the connection resumption request being used to trigger the second network element to obtain UE context information from a persistent storage device and resume connection with the user terminal by using the user terminal context information, wherein the UE context information is stored in the persistent storage device by the first network element after triggering the user terminal to suspend connection, the first network element is a network element that previously serves the user terminal, and the persistent storage device is a device different from the first network element.

[0193] The connection module 1002 is configured to resume connection with the second network element.

[0194] Optionally, as shown in Figure 11 the apparatus further includes:

[0195] The sending update request module 1101 is configured to send a notification area (RNA) update request to the second network element in response to detecting a change in the location and / or state of the user, the RNA update request triggering the second network element to update the UE context information and store the updated UE context information in the persistent storage device.

[0196] Optionally, as shown in Figure 12 the apparatus further includes:

[0197] The sending connection completion module 1201 is configured to send a UE connection resumption completion message to the second network element, the UE connection resumption completion message being used to trigger the second network element to instruct the persistent storage device to delete the UE context information.

[0198] Optionally, as shown in Figure 13 the apparatus further includes:

[0199] The entering module 1301 is configured to enter the inactive state rrc_inactive in response to receiving a connection suspension message sent by the first network element, the connection suspension message being sent by the first network element to the user terminal when the first network element detects that the user terminal has no service in a preset time period.

[0200] The connection resumption request comprises a radio resource control (RRC) resumption request.

[0201] The sending module 1001 is configured to send an RRC resumption request to the second network element in response to being in the inactive state rrc_inactive.

[0202] The present disclosure also provides an electronic device, as shown in Figure 14 The processor 1401, the communication interface 1402 and the memory 1403 are connected through the communication bus 1404 to communicate with each other.

[0203] The memory 1403 is configured to store a computer program.

[0204] The processor 1401 is configured to execute the program stored in the memory 1403 to implement the method steps of the connection resumption method applied to the second network element in the above embodiments.

[0205] The present disclosure also provides an electronic device, as shown in Figure 15 The processor 1501, the communication interface 1502 and the memory 1503 are connected through the communication bus 1504 to communicate with each other.

[0206] The memory 1503 is configured to store a computer program.

[0207] The processor 1501 is configured to execute the program stored in the memory 1503 to implement the method steps of the connection resumption method applied to the user terminal in the above embodiments.

[0208] The communication bus mentioned in the above electronic device can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0209] The communication interface is configured to communicate between the electronic device and other devices.

[0210] The memory can include a random access memory (RAM) and can also include a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory can also be at least one storage device located away from the aforementioned processor.

[0211] The aforementioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc. It can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0212] In yet another embodiment provided by the present disclosure, a computer readable storage medium is also provided, which stores a computer program. The computer program is executed by a processor to implement the steps of the aforementioned connection recovery method applied to a second network element or the connection recovery method applied to a user terminal.

[0213] In yet another embodiment provided by the present disclosure, a computer program product containing instructions, which, when run on a computer, causes the computer to execute the aforementioned connection recovery method applied to a second network element or the connection recovery method applied to a user terminal in the embodiments.

[0214] In the embodiments described above, all or some of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded into and executed by a computer, all or some of the processes or functions according to the embodiments of the present disclosure are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (SSD)) and the like.

[0215] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0216] Each of the embodiments in the specification is described in a related manner, and the same or similar parts between each of the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the device, electronic device, computer readable storage medium embodiments, since they are basically similar to the system embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0217] The above merely provides the preferred embodiment of the present disclosure, and not intended to limit the protection scope of the present disclosure. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.

Claims

1. A connection recovery system characterized by comprising: The system comprises a plurality of network elements, including a first network element and a second network element, wherein the first network element is a network element that serves a user terminal before the second network element, and the second network element is a network element to be connected with the user terminal; The first network element detects that the user terminal has no service in a preset time period, and sends a connection suspension message to the user terminal, the connection suspension message being used to trigger the user terminal to suspend the connection with the first network element, store user terminal UE context information to a persistent storage device after triggering the user terminal to suspend the connection, and release the user terminal UE context information; the persistent storage device is a device different from the first network element; The second network element acquires the user terminal UE context information from the persistent storage device in response to receiving a connection resumption request sent by the user terminal, and resumes the connection with the user terminal by using the user terminal context information.

2. The system of claim 1, wherein, The second network element is further configured to update the UE context information in response to a change in the location and / or state of the user terminal, and store the updated UE context information to the persistent storage device.

3. The system of claim 1, wherein, The second network element is further configured to instruct the persistent storage device to delete the UE context information after the connection with the user terminal is resumed.

4. The system of claim 1, wherein, The second network element is specifically configured to acquire the user terminal UE context information from the persistent storage device in response to receiving a radio resource control (RRC) resumption request sent by the user terminal, the RRC resumption request being sent by the user terminal in an rrc_inactive state, and the UE context information including context information stored by the first network element when triggering the user terminal to enter the rrc_inactive state.

5. The system according to any one of claims 1 to 4, characterized in that, The second network element is specifically configured to acquire the user terminal UE context information from a user context database (UCDB).

6. A connection recovery method characterized by, The method is applied to the connection resumption system of claim 1, and is executed by the second network element, which is a network element to be connected with the user terminal, and the method comprises the following steps: acquiring user terminal UE context information from a persistent storage device, wherein the UE context information is stored to the persistent storage device by a first network element after triggering the user terminal to suspend the connection, the first network element is a network element that serves the user terminal before the second network element, and the persistent storage device is a device different from the first network element; resuming the connection with the user terminal by using the user terminal context information.

7. The method of claim 6, wherein, The method further comprises the following steps: updating the UE context information in response to a change in the location and / or state of the user terminal, and storing the updated UE context information to the persistent storage device.

8. The method of claim 6, wherein, The method further comprises the following steps: instructing the persistent storage device to delete the UE context information after the connection with the user terminal is resumed.

9. The method of claim 6, wherein, The step of acquiring the user terminal UE context information from the persistent storage device comprises the following steps: In response to receiving a radio resource control (RRC) resume request sent by the user terminal, the user terminal context information is acquired from the persistent storage device, the RRC resume request being sent by the user terminal in an inactive state (rrc_inactive), and the user terminal context information including context information stored by the first network element when triggering the user terminal to enter the inactive state (rrc_inactive).

10. The method according to any one of claims 6 to 9, characterized in that, The acquiring of the user terminal context information from the persistent storage device comprises: The user terminal context information is acquired from a user context database (UCDB).

11. A connection recovery method characterized by comprising: The connection resumption method is applied to the connection resumption system of claim 1 and is executed by the user terminal, and comprises: sending a connection resumption request to the second network element, the connection resumption request being used to trigger the second network element to acquire user terminal context information from a persistent storage device and resume connection with the user terminal by using the user terminal context information, wherein the user terminal context information is stored in the persistent storage device by a first network element after triggering connection suspension of the user terminal, the first network element being a network element that previously served the user terminal, and the persistent storage device being a device different from the first network element; resuming connection with the second network element.

12. The method of claim 11, wherein, The method further comprises: in response to detecting a change in user location and / or state, sending a notification area (RNA) update request to the second network element, the RNA update request triggering the second network element to update the user terminal context information and store the updated user terminal context information in the persistent storage device.

13. The method of claim 11, wherein, The method further comprises: sending a user terminal (UE) connection resumption completion message to the second network element, the UE connection resumption completion message being used to trigger the second network element to instruct the persistent storage device to delete the user terminal context information.

14. The method according to any one of claims 11 to 13, characterized in that, The method further comprises: in response to receiving a connection suspension message sent by the first network element, entering an inactive state (rrc_inactive), the connection suspension message being sent by the first network element to the user terminal when detecting that there is no traffic of the user terminal within a preset time period; the connection resumption request comprises a radio resource control (RRC) resume request; the sending of the connection resumption request to the second network element comprises: in response to being in the inactive state (rrc_inactive), sending an RRC resume request to the second network element.

15. A connection recovery apparatus characterized by comprising: The connection resumption device is applied to the connection resumption system of claim 1 and is arranged in the second network element, the second network element being a network element to be connected with the user terminal, and the device comprising: an acquisition module, configured to acquire user terminal context information from a persistent storage device, wherein the user terminal context information is stored in the persistent storage device by a first network element after triggering connection suspension of the user terminal, the first network element being a network element that previously served the user terminal, and the persistent storage device being a device different from the first network element; a resumption module, configured to resume connection with the user terminal by using the user terminal context information.

16. The apparatus of claim 15, wherein, The apparatus further comprises: an updating module, configured to update the UE context information in response to a change in the location and / or state of the user terminal, and store the updated UE context information in the persistent storage device.

17. The apparatus of claim 16, wherein, The apparatus further comprises: an indication deleting module, configured to instruct the persistent storage device to delete the UE context information in response to completion of the resumption of the connection with the user terminal.

18. The apparatus of claim 15, wherein, The obtaining module is specifically configured to obtain the UE context information from the persistent storage device in response to receiving a RRC (Radio Resource Control) resume request sent by the user terminal, the RRC resume request being sent by the user terminal in an rrc_inactive state, and the UE context information including context information stored by the first network element when triggering the user terminal to enter the rrc_inactive state.

19. The apparatus of any one of claims 15 to 18, wherein, The obtaining module is specifically configured to obtain the UE context information from a UCDB (User Context Database).

20. A connection recovery apparatus characterized by comprising: The connection resumption system of claim 1, the connection resumption apparatus is arranged in the user terminal, comprising: a sending resume request module, configured to send a connection resumption request to a second network element, the connection resumption request being used to trigger the second network element to obtain UE (User Equipment) context information from a persistent storage device and resume the connection with the user terminal by using the UE context information, wherein the UE context information is stored in the persistent storage device by a first network element after triggering the user terminal to suspend the connection, the first network element being a network element that previously served the user terminal, and the persistent storage device being a device different from the first network element; a connection module, configured to resume the connection with the second network element.

21. The apparatus of claim 20, wherein, The apparatus further comprises: a sending updating request module, configured to send an RNA (Notification Area) updating request to the second network element in response to detecting a change in the location and / or state of the user terminal, the RNA updating request triggering the second network element to update the UE context information and store the updated UE context information in the persistent storage device.

22. The apparatus of claim 20, wherein, The apparatus further comprises: a sending connection completion module, configured to send a UE connection resumption completion message to the second network element, the UE connection resumption completion message being used to trigger the second network element to instruct the persistent storage device to delete the UE context information.

23. The apparatus of any one of claims 20-22, wherein, The apparatus further comprises: an entering module, configured to enter an rrc_inactive state in response to receiving a connection suspension message sent by a first network element, the connection suspension message being sent by the first network element to the user terminal when detecting that there is no service for the user terminal within a preset time period; The connection resumption request comprises a RRC (Radio Resource Control) resume request. The sending resume request module is specifically configured to send a RRC (Radio Resource Control) resume request to the second network element in response to being in an rrc_inactive state.

24. An electronic device, comprising: The apparatus comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus. a memory for storing a computer program; a processor for implementing the method steps of any one of claims 6-14 when executing the program stored in the memory.

25. A computer readable storage medium, characterized in that, The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the method steps of any one of claims 6-14.

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