Radio Resource Control (RRC) connection reestablishment method and device

Abstract

The present disclosure provides a method and device for wireless resource control (RRC) connection reconstruction, a storage medium and an electronic device; and relates to the field of communication technology. The method includes: receiving an RRC reconstruction request message sent by a user equipment (UE); searching for corresponding UE context information based on the RRC reconstruction request message; when the UE context information is not found, sending a recovery UE context request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the recovery UE context request; receiving the UE context information, and responding to the RRC reconstruction message to the UE, so that the UE completes the RRC connection reconstruction. The present disclosure can solve the problems of high failure rate of the RRC reconstruction process across base stations and VoNR service disconnection in the prior art.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication technology, and in particular to a radio resource control (RRC) connection reestablishment method, a radio resource control (RRC) connection reestablishment device, a computer-readable medium, and an electronic device. Background Art

[0002] The fifth generation mobile communication technology (5th Generation Mobile Communication Technology, referred to as 5G) is a new generation of broadband mobile communication technology with the characteristics of high speed, low latency and large connection. It is the network infrastructure for realizing the interconnection of people, machines and things. 5G NR (New Radio) is a global 5G standard with a new air interface design based on OFDM. It is also a very important foundation for the next generation of cellular mobile technology. 5G technology will achieve ultra-low latency and high reliability. In the NR system, for user equipment (User Equipment, UE) in a connected state, the NR system introduces a radio resource control (Radio Resource Control, RRC) re-establishment mechanism. The purpose of this process is to re-establish the RRC connection, which involves the reconstruction of SRB1 and secure reactivation.

[0003] The existing 5G NR protocol defines the RRC reconstruction protocol process and the UE context transfer process between base stations, but these processes are for the migration of UE from RRC inactive state to connected state. When the reconstruction base station is not the same as the source base station, RRC reconstruction fails and service is interrupted.

[0004] In the existing NR protocol, the failure rate of the RRC reconstruction process across base stations is high, that is, when the RRC is in a connected state and the UE is activated, the RRC reconstruction failure rate is high, resulting in the VoNR (Voice Over NR, voice service running in the 5G frequency band) service disconnection problem, which seriously affects the VoNR service perception.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The purpose of the embodiments of the present disclosure is to provide a radio resource control RRC connection reconstruction method, a radio resource control RRC connection reconstruction device, a computer-readable medium and an electronic device, thereby solving to a certain extent the problem of high failure rate of RRC reconstruction process across base stations and VoNR service disconnection in the prior art.

[0007] According to a first aspect of the present disclosure, a radio resource control (RRC) connection reestablishment method is provided, which is applied to a target base station in a 5G air interface system, and the method includes:

[0008] Receiving an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier;

[0009] Searching for corresponding UE context information based on the RRC reestablishment request message;

[0010] When the UE context information is not found, sending a UE context recovery request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the UE context recovery request;

[0011] The UE context information is received, and an RRC connection reestablishment message is responded to the UE, so that the UE completes the RRC connection reestablishment.

[0012] In an exemplary embodiment of the present disclosure, based on the aforementioned solution, searching for corresponding UE context information based on the RRC reestablishment request message includes one of the following:

[0013] searching the UE context information based on the cell radio network temporary identifier, the physical cell identifier and the short message integrity authentication code; the cell radio network temporary identifier and the short message integrity authentication code are carried in the RRC reestablishment request message;

[0014] The UE context information is searched based on the UE context identifier.

[0015] In an exemplary embodiment of the present disclosure, based on the foregoing solution, the sending a request to restore the UE context to the corresponding source base station based on the physical cell identifier and the UE context identifier includes:

[0016] Determine a corresponding source base station based on the physical cell identifier;

[0017] Sending a UE context recovery request to the source base station based on the UE context identifier; the UE context recovery request carries the UE context identifier;

[0018] The source base station acquires UE context information negotiated in the initial RRC establishment phase based on the UE context identifier, including:

[0019] In response to the UE context restoration request, the UE context information negotiated in the initial RRC establishment phase is acquired through the source base station based on the UE context identifier.

[0020] In an exemplary embodiment of the present disclosure, based on the above solution, the method further includes:

[0021] The UE detects whether the RRC connection reestablishment request is currently satisfied in the RRC connection state.

[0022] In an exemplary embodiment of the present disclosure, based on the foregoing solution, detecting, by the UE in the RRC connected state, whether the RRC connection reestablishment request is currently satisfied includes:

[0023] Detecting a radio link failure by the UE in an RRC connected state;

[0024] Detecting a handover failure by the UE in an RRC connected state;

[0025] Detecting, by the UE in an RRC connected state, an integrity check failure;

[0026] Detecting, by the UE in an RRC connected state, an RRC reconfiguration failure;

[0027] When any of the above situations is detected, it is determined that the RRC connection reestablishment request is currently satisfied.

[0028] In an exemplary embodiment of the present disclosure, based on the above solution, the method further includes:

[0029] The target base station is determined based on cell signal quality.

[0030] In an exemplary embodiment of the present disclosure, based on the above solution, the step of determining the target base station based on the cell signal quality includes:

[0031] Selecting a target cell based on cell signal quality;

[0032] The target base station is determined based on the target cell.

[0033] According to a second aspect of the present disclosure, a radio resource control (RRC) connection reestablishment device is provided, including:

[0034] A receiving module, configured to receive an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier;

[0035] A search module, used to search for corresponding UE context information based on the RRC reconstruction request message;

[0036] a sending response module, configured to send a UE context recovery request to a corresponding source base station based on the physical cell identifier and the UE context identifier when the search module fails to find the UE context information, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the UE context recovery request;

[0037] The reestablishment response module is used to receive the UE context information and respond to the UE with an RRC reestablishment message so that the UE completes the RRC connection reestablishment.

[0038] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the radio resource control RRC connection reestablishment method described in any one of the above is implemented.

[0039] According to the fourth aspect of the present disclosure, an electronic device is provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute any one of the wireless resource control RRC connection reconstruction methods described above by executing the executable instructions.

[0040] The exemplary embodiments of the present disclosure may have some or all of the following beneficial effects:

[0041] In the radio resource control RRC connection reconstruction method provided in the public example implementation, the target base station can receive the RRC reconstruction request message sent by the user equipment UE, and the RRC reconstruction request message carries the UE context identifier. When the UE context information is not found, the target base station sends a recovery UE context request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier, and responds the UE context information to the target base station, so that the UE completes the RRC connection reconstruction. On the one hand, it solves the problem of high failure rate of RRC reconstruction across base stations in the NR system and avoids the problem of VoNR service disconnection; on the other hand, by carrying the UE context identifier in the RRC reconstruction request message sent by the UE, the RRC reconstruction efficiency and network efficiency are improved.

[0042] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0044] Figure 1 A schematic diagram showing an exemplary scenario architecture of an existing radio resource control RRC connection reestablishment method and device;

[0045] Figure 2 The flowchart of the radio resource control RRC connection reestablishment method according to an embodiment of the present disclosure is schematically shown;

[0046] Figure 3 A flowchart for obtaining UE context information according to an embodiment of the present disclosure is schematically shown;

[0047] Figure 4 A schematic diagram of a process of an RRC connection reestablishment method between a user equipment and a base station according to an embodiment of the present disclosure is schematically shown;

[0048] Figure 5 A schematic diagram of a structure of a radio resource control (RRC) connection reestablishment device according to an embodiment of the present disclosure is shown;

[0049] Figure 6 A block diagram of an electronic device suitable for implementing the embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0050] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present disclosure will be more comprehensive and complete, and the concepts of the example embodiments are fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0051] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0052] Figure 1 A schematic diagram of a system architecture 100 of an exemplary application environment in which a method and apparatus for reestablishing a radio resource control (RRC) connection according to an embodiment of the present disclosure can be applied is shown. Figure 1 As shown, the system architecture 100 may include one or more of user devices 101, 102, 103, a target base station 104, and a source base station 105. Communication is performed between user devices 101, 102, 103 and target base station 104, and between target base station 104 and source base station 105 through a network. User devices 101, 102, 103 are devices with wireless transceiver functions that can be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; they can also be deployed on the water surface (such as ships, etc.); they can also be deployed in the air (for example, on airplanes, balloons, and satellites, etc.). The user devices 101, 102, 103 may be mobile phones, tablet computers, computers with wireless transceiver functions, virtual reality terminals, augmented reality terminals, wireless terminals in industrial control, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like. The embodiments of the present application do not limit the application scenarios.

[0053] The RRC connection reestablishment method provided in the embodiment of the present disclosure may be executed in the target base station 104 , and accordingly, the RRC connection reestablishment device is generally disposed in the target base station 104 .

[0054] The base station (NG-RANnode, gNB) of the 5G network can support large-capacity services. 5G base stations are also called: gNB. 5G NR is a global 5G standard based on a new air interface design of OFDM (Orthogonal Frequency Division Multiplexing). It is also a very important foundation for the next generation of cellular mobile technology. 5G technology will achieve ultra-low latency and high reliability. The NR protocol stipulates that during the RRC re-establishment process, if the network can find and verify a valid UE context, the RRC connection can be reestablished successfully; if the UE context cannot be retrieved, the network will respond with RRC Setup. That is, whether the base station has UE context information is the key to the success of RRC reconstruction, otherwise the network side will guide the UE to perform the RRC connection process, causing service interruption. In the process of cross-base station RRC re-establishment, there is no UE context information in the reconstructed base station, resulting in reconstruction failure. In view of the problem that the current NR protocol does not support the transfer of UE context between base stations during RRC re-establishment, the RRC connection reconstruction method disclosed in this disclosure is elaborated in detail.

[0055] The technical solution of the embodiment of the present disclosure is described in detail below:

[0056] refer to Figure 2 As shown, a radio resource control RRC connection reestablishment method according to an exemplary embodiment of the present disclosure is applied to a target base station in a 5G air interface system and may include the following steps:

[0057] Step S210, receiving an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier;

[0058] Step S220, searching for corresponding UE context information based on the RRC reestablishment request message;

[0059] Step S230: When the UE context information is not found, a UE context recovery request is sent to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the UE context recovery request;

[0060] Step S240: receiving the UE context information, and responding to the UE with an RRC connection reestablishment message, so that the UE completes the RRC connection reestablishment.

[0061] In the radio resource control RRC connection reconstruction method provided in the public example implementation, the target base station can receive the RRC reconstruction request message sent by the user equipment UE, and the RRC reconstruction request message carries the UE context identifier. When the UE context information is not found, the target base station sends a recovery UE context request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier, and responds the UE context information to the target base station, so that the UE completes the RRC connection reconstruction. On the one hand, it solves the problem of high failure rate of RRC reconstruction across base stations in the NR system and avoids the problem of VoNR service disconnection; on the other hand, by carrying the UE context identifier in the RRC reconstruction request message sent by the UE, the RRC reconstruction efficiency and network efficiency are improved.

[0062] Next, in another embodiment, the above steps are described in more detail.

[0063] In step S210, an RRC reestablishment request message sent by a user equipment UE is received.

[0064] In this example implementation, the RRC reestablishment request message may carry a Cell-Radio Network Temporary Identifier (C-RNTI), which is a dynamic identifier assigned to the UE by the base station, a physical cell identity (PCI), a short message integrity authentication code (short MAC-I) and a UE context ID, etc. The UE context ID information is already available to the user equipment when the user equipment establishes a connection with the network side, and the UE context ID information only needs to be sent to the target base station when the UE is activated.

[0065] In this example implementation, the target base station may be a base station that performs RRC connection reestablishment with the user equipment. The target base station may be a source base station or another base station different from the source base station. The present disclosure is particularly directed to the RRC reestablishment failure problem that occurs when the target base station is different from the source base station. The source base station may be a base station at the time of the initial RRC connection. The target base station and the source base station in this example implementation may be gNBs.

[0066] In this example implementation, before step S210, a process of determining a target base station may be included, that is, determining the target base station based on cell signal quality.

[0067] In this example implementation, first, the target cell can be selected based on the cell signal quality. In this example implementation, the user equipment can search the signal quality of each current cell, sort the cells by signal quality, and can use the cell with the best signal quality ranked first as the target cell; or several cells ranked in the top few positions can be used as candidate cells, and the target cell can be selected from the candidate cells according to the signal strength, for example, the candidate cell with the highest signal strength can be used as the target cell. The target cell can be the source cell, that is, the cell where the UE resides before the RRC reconstruction, or it can be another cell different from the source cell, and this example implementation does not specifically limit this.

[0068] Then, the target base station may be determined based on the target cell. In this exemplary implementation, the base station to which the target cell belongs is used as the target base station, and after the target cell is determined, its corresponding target base station is also determined.

[0069] In this example implementation, there is a trigger condition for the UE to send an RRC reestablishment request message, that is, when the UE detects that the trigger condition for sending the RRC reestablishment request message is currently met, it searches for a suitable cell, namely the target cell, and sends an RRC reestablishment request message to the target base station to which the target cell belongs.

[0070] In this example implementation, the triggering condition for sending the RRC reestablishment request message is any of the following:

[0071] The UE detects a radio link failure in an RRC connected state;

[0072] The UE detects a handover failure in the RRC connected state.

[0073] The UE detects that the integrity check fails in the RRC connected state, that is, the underlying integrity protection fails.

[0074] The UE detects an RRC reconfiguration failure in the RRC connected state.

[0075] When any of the above situations is detected, it is determined that the RRC connection reestablishment request is currently satisfied, and the UE sends an RRC connection reestablishment request.

[0076] In step S220, corresponding UE context information is searched based on the RRC reestablishment request message.

[0077] In this example implementation, the UE context information may include information such as UE capabilities, bearer identification information, QCI (QoS Class Identifier) ​​level, S1-AP (S1 Application Protocol) identification information, and the current UE's security capability. It may also include access layer security information (AS security information), the radio access bearer E-RAB (E-UTRAN Radio Access Bearer) information established by the UE, and information related to RRC connection management (RRC context). This example does not make any special limitations on this.

[0078] In this example implementation, the UE context information may be searched through the following steps.

[0079] The UE context information may be searched based on a cell radio network temporary identifier, a physical cell identifier, and a short message integrity authentication code; the cell radio network temporary identifier, the physical cell identifier, and the short message integrity authentication code are carried in the RRC reestablishment request message;

[0080] The UE context information may be searched based on the UE context identifier, that is, the corresponding UE context information may be searched directly through the UE context identifier. The UE context identifier may be sent to the target base through the UE.

[0081] In this example implementation, when the UE context information is found, an RRC reestablishment message is responded to the UE, so that the UE completes the RRC connection reestablishment.

[0082] In step S230, when the UE context information is not found, a restore UE context request is sent to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the restore UE context request.

[0083] In this example implementation, reference Figure 3 As shown, UE context information is acquired through steps S310-S330.

[0084] In step S310, the target base station determines the corresponding source base station based on the physical cell identifier; in this example implementation, the physical cell identifier can be used to indicate cell information, that is, cell information when the user equipment first establishes an RRC connection, based on which the source base station information to which the cell belongs can be determined.

[0085] In step S320, the target base station sends a restore UE context request to the source base station based on the UE context identifier; in this example implementation, the target base station may add the UE context identifier to the restore UE context request so that the request carries the UE context identifier. In this example implementation, in addition to carrying the UE context identifier, the restore UE context request may also carry other information, such as the name and content of the UE context information to be restored, and this example does not specifically limit this.

[0086] In step S330, in response to the request to restore the UE context, the source base station obtains the UE context information negotiated during the initial RRC establishment phase based on the UE context identifier. In this example implementation, the source base station has negotiated and determined the UE context information during the initial RRC connection establishment process, and the source base station can obtain the corresponding UE context information based on the UE context identifier.

[0087] In step S240, the UE context information is received, and an RRC reestablishment message is responded to the UE, so that the UE completes the RRC connection reestablishment. In this example implementation, the UE context information is acquired by the source base station, the target base station receives the UE context information, and responds to the RRC reestablishment message to the UE, so that the UE completes the RRC connection reestablishment.

[0088] For example, refer to Figure 4 The method disclosed in the present invention is used to implement the reconstruction process of the radio resource control RRC connection.

[0089] Step S401, the UE detects whether the RRC connection re-establishment request is currently met in the RRC connection state; in this example, when the UE detects any of the following situations, such as radio link failure, handover failure, receiving an underlying integrity check failure indication, reconfiguration failure, etc., the cell selection process can be executed.

[0090] Step S402: The UE selects a suitable cell as a target cell based on the cell signal quality.

[0091] Step S403: The UE determines the target base station to which it belongs according to the target cell.

[0092] Step S404: The UE sends an RRC connection reestablishment request message to the target base station. The RRC connection reestablishment request message (RRCConnection Reestablishment Request) carries not only the C-RNTI, physCellId (physical cell identifier) ​​and shortMAC-I information element before the reestablishment, but also the UE Context ID.

[0093] Step S405: The target base station receives an RRC reestablishment request message sent by the user equipment UE.

[0094] Step S406: The target base station searches for the UE context information according to the c-RNTI, physCellId and shortMAC-I; or the target base station searches for the UE context information according to the UE Context ID.

[0095] Step S407: The target base station determines that the UE context information does not exist.

[0096] Step S408: The target base station sends a Retrieve UE Context Request message (carrying a UE ContextID information element) to restore the UE context.

[0097] Step S409: The source base station obtains the UEContext information negotiated by the UE in the previous RRC establishment phase according to the UE Context ID information element.

[0098] Step S410: The source base station sends a recovery request response, that is, the source base station responds to the requesting party with a Retrieve UE Context Response message carrying a UE Context information element.

[0099] Step S411: the target base station receives a UE context message.

[0100] Step S412: The target base station responds to the UE with an RRC Reestablishment message.

[0101] Step S413, the UE replies an RRC Reestablishment Complete message to the target base station, and thus the whole process of RRC reestablishment between base stations is completed.

[0102] After detecting that the RRC connection re-establishment request is met and determining the target base station, the target base station can receive the RRC reconstruction request message sent by the user equipment UE. The RRC reconstruction request message carries the UE context identifier. When the target base station fails to find the UE context information, the target base station sends a recovery UE context request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier, and responds the UE context information to the target base station, so that the UE completes the RRC connection reconstruction. On the one hand, it solves the problem of high failure rate of RRC reconstruction across base stations in the NR system and avoids the problem of VoNR service disconnection; on the other hand, by carrying the UE context identifier in the RRC reconstruction request message sent by the UE, the RRC reconstruction efficiency and network efficiency are improved.

[0103] Furthermore, in this exemplary embodiment, a radio resource control RRC connection reestablishment device 500 is also provided. The radio resource control RRC connection reestablishment device 500 can be applied to a target base station. Figure 5 As shown, the radio resource control RRC connection reestablishment device 500 may include:

[0104] The receiving module 510 may be configured to receive an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier;

[0105] A search module 520 may be configured to search for corresponding UE context information based on the RRC reestablishment request message;

[0106] The sending response module 530 may be configured to send a recovery UE context request to the corresponding source base station based on the physical cell identifier and the UE context identifier when the search module fails to find the UE context information, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the recovery UE context request;

[0107] The reestablishment response module 540 may be configured to receive the UE context information and respond to the UE with an RRC reestablishment message so that the UE completes the RRC connection reestablishment.

[0108] In an exemplary embodiment of the present disclosure, the search module 520 includes:

[0109] The first search module can be used to search for the UE context information based on the cell radio network temporary identifier, the physical cell identifier and the short message integrity authentication code.

[0110] The second search module may be configured to search for the UE context information based on the UE context identifier.

[0111] In an exemplary embodiment of the present disclosure, the sending response module 530 includes:

[0112] A source base station determination module, which can be used to determine the corresponding source base station based on the physical cell identifier;

[0113] A request sending module, which can be used to send a request to restore the UE context to the source base station based on the UE context identifier; the request to restore the UE context carries the UE context identifier;

[0114] The acquisition module can be used to respond to the UE context recovery request and acquire the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier through the source base station.

[0115] In an exemplary embodiment of the present disclosure, the apparatus 500 further includes:

[0116] The detection module can be used to detect whether the RRC connection reconstruction request is currently met through the UE in the RRC connection state.

[0117] In an exemplary embodiment of the present disclosure, the apparatus 500 further includes:

[0118] The target base station determination module can be used to determine the target base station based on the cell signal quality.

[0119] In an exemplary embodiment of the present disclosure, the target base station determination module may also be used to:

[0120] Selecting a target cell based on cell signal quality;

[0121] The target base station is determined based on the target cell.

[0122] The specific details of each module or unit in the above-mentioned radio resource control RRC connection reestablishment device have been described in detail in the corresponding radio resource control RRC connection reestablishment method, so they will not be repeated here.

[0123] As another aspect, the present application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being installed in the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the following embodiment. For example, the electronic device may implement the following method. Figure 2 to Figure 4 The various steps shown, etc.

[0124] It should be noted that the computer-readable medium shown in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0125] In addition, in an exemplary embodiment of the present disclosure, an electronic device capable of implementing the above method is also provided. It will be appreciated by those skilled in the art that various aspects of the present disclosure may be implemented as a system, method, or program product. Therefore, various aspects of the present disclosure may be specifically implemented in the following forms, namely: a complete hardware embodiment, a complete software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, which may be collectively referred to herein as a "circuit", "module", or "system".

[0126] Refer to the following Figure 6 hereinafter describes an electronic device 600 according to such an embodiment of the present disclosure. Figure 6 The electronic device 600 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0127] like Figure 6As shown, the electronic device 600 is in the form of a general computing device. The components of the electronic device 600 may include but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different system components (including the storage unit 620 and the processing unit 610), and a display unit 640.

[0128] The storage unit stores program codes, which can be executed by the processing unit 610, so that the processing unit 610 executes the steps according to various exemplary embodiments of the present disclosure described in the above “Exemplary Method” section of this specification.

[0129] The storage unit 620 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 6201 and / or a cache memory unit 6202 , and may further include a read-only memory unit (ROM) 6203 .

[0130] The storage unit 620 may also include a program / utility 6204 having a set (at least one) of program modules 6205, such program modules 6205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0131] Bus 630 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0132] The electronic device 600 may also communicate with one or more external devices 700 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 600, and / or communicate with any device that enables the electronic device 600 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 650. Furthermore, the electronic device 600 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 660. As shown, the network adapter 660 communicates with other modules of the electronic device 600 via a bus 630. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RA identification systems, tape drives, and data backup storage systems.

[0133] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the embodiment of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiment of the present disclosure.

[0134] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0135] It should be noted that, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in the specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc., which shall all be considered as part of the present disclosure.

[0136] It should be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the accompanying drawings. All these different combinations constitute multiple alternative aspects of the disclosure. The embodiments of this specification illustrate the best mode known for implementing the disclosure and will enable those skilled in the art to utilize the disclosure.

Claims

1. A radio resource control RRC connection reestablishment method, applied to a target base station in a 5G air interface system, characterized in that: The method comprises: Receiving an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier; the UE context identifier is an index of UE context transfer between base stations in a 5G air interface system; Searching for corresponding UE context information based on the RRC reconstruction request message; searching for corresponding UE context information based on the RRC reconstruction request message includes: searching for the UE context information based on a cell radio network temporary identifier, the physical cell identifier, and a short message integrity authentication code; the cell radio network temporary identifier and the short message integrity authentication code are carried in the RRC reconstruction request message; When the UE context information is not found, sending a UE context recovery request to the corresponding source base station based on the physical cell identifier and the UE context identifier, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the UE context recovery request; The UE context information is received, and an RRC connection reestablishment message is responded to the UE, so that the UE completes the RRC connection reestablishment.

2. The method for reestablishing a radio resource control (RRC) connection according to claim 1, characterized in that: The searching for corresponding UE context information based on the RRC reestablishment request message further includes: The UE context information is searched based on the UE context identifier.

3. The method for reestablishing a radio resource control (RRC) connection according to claim 1, characterized in that: The sending a request to restore the UE context to the corresponding source base station based on the physical cell identifier and the UE context identifier includes: Determine a corresponding source base station based on the physical cell identifier; Sending a UE context recovery request to the source base station based on the UE context identifier; the UE context recovery request carries the UE context identifier; The source base station acquires UE context information negotiated in the initial RRC establishment phase based on the UE context identifier, including: In response to the UE context restoration request, the UE context information negotiated in the initial RRC establishment phase is acquired through the source base station based on the UE context identifier.

4. The method for reestablishing a radio resource control (RRC) connection according to claim 1, characterized in that: The method further comprises: The UE detects whether the RRC connection reestablishment request is currently satisfied in the RRC connection state.

5. The method for reestablishing a radio resource control (RRC) connection according to claim 4, characterized in that: The detecting, by the UE in the RRC connected state, whether the RRC connection reestablishment request is currently satisfied includes: Detecting a radio link failure by the UE in an RRC connected state; Detecting a handover failure by the UE in an RRC connected state; Detecting, by the UE in an RRC connected state, an integrity check failure; Detecting, by the UE in an RRC connected state, an RRC reconfiguration failure; When any of the above situations is detected, it is determined that the RRC connection reestablishment request is currently satisfied.

6. The method for reestablishing a radio resource control (RRC) connection according to claim 1, characterized in that: The method further comprises: The target base station is determined based on cell signal quality.

7. The method for reestablishing a radio resource control (RRC) connection according to claim 6, characterized in that: The determining the target base station based on cell signal quality includes: Selecting a target cell based on cell signal quality; The target base station is determined based on the target cell.

8. A radio resource control (RRC) connection reestablishment device, characterized in that: include: A receiving module, configured to receive an RRC reestablishment request message sent by a user equipment UE; the RRC reestablishment request message carries at least a physical cell identifier and a UE context identifier; the UE context identifier is an index of UE context transfer between base stations in a 5G air interface system; A search module, used to search for corresponding UE context information based on the RRC reconstruction request message; A search module, configured to search for the UE context information based on a cell radio network temporary identifier, the physical cell identifier and a short message integrity authentication code; The cell radio network temporary identifier and the short message integrity authentication code are carried in the RRC reestablishment request message; a sending response module, configured to send a UE context recovery request to a corresponding source base station based on the physical cell identifier and the UE context identifier when the search module fails to find the UE context information, so that the source base station obtains the UE context information negotiated in the initial RRC establishment phase based on the UE context identifier and responds to the UE context recovery request; The reestablishment response module is used to receive the UE context information and respond to the UE with an RRC reestablishment message so that the UE completes the RRC connection reestablishment.

9. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: include: one or more processors; A storage device, used to store one or more programs, when the one or more programs are executed by the one or more processors, enables the one or more processors to implement the method according to any one of claims 1 to 7.

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