CN109548191B

CN109548191B - RRC connection reestablishment method, RRC connection recovery method, computer-readable storage medium, and base station

Info

Publication number: CN109548191B
Application number: CN201710651091.9A
Authority: CN
Inventors: 邓云
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2017-08-02
Filing date: 2017-08-02
Publication date: 2020-05-26
Anticipated expiration: 2037-08-02
Also published as: CN110493889A; CN109548191A; CN111542094B; CN111542094A; CN110493889B

Abstract

An RRC connection reestablishment method, a recovery method, a computer-readable storage medium, and a base station. The reconstruction method comprises the following steps: when an RRC connection reestablishment request sent by UE is received, acquiring the state information of a core network connected currently; judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network; and reestablishing the RRC connection with the UE based on the judgment result. By applying the scheme, better network service can be provided for the UE when the UE triggers the RRC connection reestablishment.

Description

RRC connection reestablishment method, RRC connection recovery method, computer-readable storage medium, and base station

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for reestablishing and recovering an RRC connection, a computer-readable storage medium, and a base station.

Background

Currently, a base station of Long Term Evolution (LTE) is usually connected to an LTE core network (EPC). With the continuous development of mobile communication, a fifth generation mobile communication (5G) Technology, i.e., a New Radio Access Technology in 3GPP (NR) Technology with a larger data capacity and a faster data processing speed, can meet the demand of users for larger data volume and cope with smaller transmission delay.

The introduction of 5G requires the operator to upgrade existing access and core networks, which is costly. In order to reuse existing radio access network equipment (i.e., base stations) as much as possible, operators desire that LTE base stations can access a 5G core network (5GC), thereby not only making full use of existing radio access network equipment, but also enabling users to enjoy new services provided by the 5G core network.

When an LTE base station can be connected to a core network of LTE and a core network of 5G at the same time, a User Equipment (UE) resides in a cell under the control of the base station. When the connected UE triggers RRC connection reestablishment, according to the existing reestablishment procedure, the UE still accesses the core network that was accessed before, that is, the core network of LTE, which finally results in that the network cannot provide better service for the UE.

Disclosure of Invention

The problem to be solved by the present invention is how to provide better network service for the UE when the UE triggers RRC connection reestablishment.

In order to solve the above problem, an embodiment of the present invention provides a RRC connection reestablishment method, where the method includes: when an RRC connection reestablishment request sent by UE is received, acquiring the state information of a core network connected currently; judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network; and reestablishing the RRC connection with the UE based on the judgment result.

Optionally, the state information of the currently connected core network includes: load status information of the currently connected core network.

Optionally, the reestablishing the RRC connection with the UE based on the determination result includes: when determining to adjust the core network accessed by the UE, sending a network switching request to the adjusted core network, wherein the network switching request comprises: identification information of the UE; when receiving the network switching request confirmation message sent by the adjusted core network, sending an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted identification information of the core network; and when an RRC connection reestablishment completion message sent by the UE is received, reestablishing the RRC connection with the UE.

Optionally, the network handover request further includes: identification information of a core network serving the UE before the adjustment.

Optionally, the adjusted core network sends the network handover request acknowledgement message after acquiring the context of the UE from the core network serving the UE before the adjustment.

Optionally, the RRC connection reestablishment message further includes: PDCP type indication information.

Optionally, the PDCP type includes: LTE PDCP and NR PDCP.

Optionally, the reestablishing the RRC connection with the UE based on the determination result includes: when determining that the core network accessed by the UE is not adjusted, sending an RRC connection reestablishment message to the UE; and when an RRC connection reestablishment completion message sent by the UE is received, reestablishing the RRC connection with the UE.

The embodiment of the invention also provides a RRC connection recovery method, which comprises the following steps: when an RRC connection recovery request sent by UE is received, acquiring the state information of a core network connected currently; judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network; and recovering the RRC connection with the UE based on the judgment result.

Optionally, the recovering the RRC connection with the UE based on the determination result includes: when determining to adjust the core network accessed by the UE, sending a network switching request to the adjusted core network, wherein the network switching request comprises: identification information of the UE; when receiving a network switching request confirmation message sent by the adjusted core network, sending an RRC connection recovery message to the UE, where the RRC connection recovery message includes: the type information of the adjusted core network; and when receiving an RRC connection recovery completion message sent by the UE, recovering the RRC connection with the UE.

Optionally, the network handover request further includes: network element identification information of a core network serving the UE before the adjustment.

Optionally, the adjusted core network sends the network handover request acknowledgement message after acquiring the context of the UE from the network element of the core network serving the UE before the adjustment.

Optionally, the RRC connection recovery message further includes: the indication information of the PDCP type is modified.

Optionally, the PDCP type includes: LTE PDCP or NR PDCP.

Optionally, the recovering the RRC connection with the UE based on the determination result includes: when determining that the core network accessed by the UE is not adjusted, sending an RRC connection re-recovery message to the UE; and when receiving an RRC connection recovery completion message sent by the UE, recovering the RRC connection with the UE.

An embodiment of the present invention further provides a base station, where the base station includes: the device comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is suitable for acquiring the state information of a currently connected core network when receiving an RRC connection reestablishment request sent by UE; a judging unit, adapted to judge whether to adjust a core network to which the UE is accessed based on the acquired state information of the core network; a reestablishing unit adapted to reestablish the RRC connection with the UE based on the determination result.

Optionally, the state information of the currently connected core network, acquired by the acquiring unit, includes: load status information of the currently connected core network.

Optionally, the reconstruction unit includes: a first sending subunit, adapted to send, when it is determined to adjust a core network to which the UE accesses, a network handover request to the adjusted core network, where the network handover request includes: identification information of the UE; a second sending subunit, adapted to send, when receiving the network handover request acknowledgement message sent by the adjusted core network, an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted identification information of the core network; the first reestablishment subunit is adapted to reestablish the RRC connection with the UE when the RRC connection reestablishment completion message sent by the UE is received.

Optionally, the network handover request sent by the first sending subunit further includes: identification information of a core network serving the UE before the adjustment.

Optionally, the network handover request confirm message is sent by the adjusted core network by obtaining the context of the UE from the core network serving the UE before the adjustment.

Optionally, the PDCP type includes: LTE PDCP and NR PDCP.

Optionally, the reconstruction unit includes: a third sending subunit, adapted to send an RRC connection reestablishment message to the UE when it is determined that the core network to which the UE is accessed is not adjusted; the first reestablishment subunit is adapted to reestablish the RRC connection with the UE when the RRC connection reestablishment completion message sent by the UE is received.

Embodiments of the present invention further provide a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method of any one of the above-mentioned steps is performed.

The embodiment of the present invention further provides a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the computer instructions to perform any one of the steps of the method described above.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

by adopting the scheme, when the RRC connection reestablishment request is received, the state information of the currently connected core network is acquired, whether the core network accessed by the UE is adjusted or not is determined based on the acquired state information of the core network, and the RRC connection with the UE can be reestablished based on the adjustment result, so that the UE can be accessed to the core network in a better state, and better network service can be provided for the UE.

Further, because the RRC connection reestablishment message further includes the PDCP type indication information, signaling overhead can be effectively saved compared with the configuration of the PDCP type for the UE through a special signaling after the RRC connection reconfiguration.

Drawings

Fig. 1 is a flowchart of a method for reestablishing an RRC connection according to an embodiment of the present invention;

fig. 2 is a flowchart of another RRC connection reestablishment method according to an embodiment of the present invention;

fig. 3 is a flowchart of a RRC connection reestablishment method according to another embodiment of the present invention;

FIG. 4 is a flowchart of a method for indicating a PDCP type according to an embodiment of the present invention;

fig. 5 is a flow chart of a method for recovering an RRC connection according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a block diagram of a user terminal in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another base station in the embodiment of the present invention.

Detailed Description

Taking the core network accessed when the UE initially establishes the RRC connection and the data radio bearer as the LTE core network as an example, the UE accesses the cell under the control of the base station to establish the RRC connection, and the base station selects the LTE core network for the UE. The base station transmits Non-Access Stratum (NAS) signaling to the 4G core network. The LTE core network authenticates the UE, simultaneously allocates configuration parameters for establishing an evolved Radio Access Bearer (E-RAB), and sends the configuration parameters to the base station through an initial context establishment request.

After receiving the initial context establishment request sent by the LTE core network, the base station allocates configuration parameters such as a Data Radio Bearer (DRB) to the UE, and sends the allocated relevant configuration parameters to the UE through an RRC connection reconfiguration message. And after receiving the configuration parameters, the UE applies the allocated configuration parameters and returns an RRC connection reconfiguration completion message to the base station. And the base station sends an initial context establishment completion message to the core network after receiving the RRC connection reconfiguration completion message, so that the UE can start data transmission.

In the data transmission process, radio link failure may occur in the UE, and the UE may trigger RRC connection reestablishment. According to the existing reestablishment process, the UE continues to use the previously accessed core network, and if the previously accessed core network is overloaded, the network may not provide better service for the UE.

In view of the above problems, an embodiment of the present invention provides an RRC connection reestablishment method, where when an RRC connection reestablishment request is received, state information of a currently connected core network is acquired, and whether to adjust the core network to which the UE is connected is determined based on the acquired state information of the core network, and then an RRC connection with the UE can be reestablished based on an adjustment result, so that the UE can access the core network in a better state, and thus, a better network service can be provided for the UE.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1, an embodiment of the present invention provides a RRC connection reestablishment method, where the method may include the following steps:

and step 11, when receiving an RRC connection reestablishment request sent by the UE, acquiring the state information of the currently connected core network.

In a specific implementation, during data transmission, the UE may cause a radio link failure due to sudden degradation of a radio signal, and trigger RRC connection reestablishment. When RRC connection reestablishment is triggered, the UE may choose to reside in a cell managed by the original base station or a cell managed by an adjacent base station. That is, the base station that receives the RRC connection reestablishment request sent by the UE may be a base station corresponding to the original access cell of the UE, or may be a neighboring base station of the base station corresponding to the original access cell. Specifically, whichever base station receives the RRC connection reestablishment request sent by the UE, the RRC connection reestablishment method described in the embodiment of the present invention may be executed to reestablish the RRC connection with the UE.

In particular implementations, the UE may send an RRC connection reestablishment request to the base station in the process of initiating random access. After receiving the RRC connection reestablishment request, the base station may first acquire state information of a currently connected core network. In the embodiment of the present invention, it is assumed that the base station is simultaneously connected to a plurality of core networks including a core network to which the UE has originally accessed.

For example, taking the core network originally accessed by the UE as the LTE core network as an example, the base station is connected to both the LTE core network and the 5G core network. When the base station is connected with the LTE core network and the 5G core network at the same time, the base station can acquire the state information of the LTE core network and the 5G core network. It should be noted that the base station may obtain the state information of the connected core network in advance, because the base station needs to provide services for other UEs, the base station needs to learn the state information of the core network in real time so as to select a suitable core network for the UE.

In a specific implementation, the state information of the currently connected core network may include: load status information of the currently connected core network. Of course, other information capable of characterizing the current state of the core network, such as temporary access restriction information, may also be included, and is not particularly limited.

And step 12, judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network.

In a specific implementation, after acquiring the state information of the core network, the base station may determine the current state of the connected core network based on the acquired information.

Taking the core network originally accessed by the UE as the LTE core network and the information acquired by the base station as the load state information of the LTE core network and the 5G core network as an example, if the load state of the 5G core network is better than the load state of the LTE core network, the base station may adjust the core network accessed by the UE to be the 5G core network, otherwise, the core network accessed by the UE is not required to be adjusted, that is, the core network accessed by the UE is still the LTE core network.

And step 13, reestablishing the RRC connection with the UE based on the judgment result.

In a specific implementation, when it is determined to adjust a core network to which the UE is accessed, after RRC connection with the UE is reestablished, the UE is enabled to perform service communication with the adjusted core network. And when the core network accessed by the UE is judged not to be adjusted, after the RRC connection between the UE and the UE is reestablished, the UE still carries out service communication with the previously accessed core network.

Fig. 2 is another RRC connection reestablishment method according to an embodiment of the present invention. Referring to fig. 2, the method may include the steps of:

step 21, when receiving an RRC connection reestablishment request sent by the UE, obtaining the state information of the currently connected core network.

And step 22, judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network.

And executing step 23 when the core network accessed by the UE is judged to be adjusted, otherwise executing step 26.

Step 23, sending a network switching request to the adjusted core network, where the network switching request includes: identification information of the UE.

Taking the core network to which the UE originally accesses as an LTE core network and the adjusted core network as a 5G core network as an example, after receiving a network handover request sent by a base station, the 5G core network may obtain identification information of the UE based on the network handover request, further obtain a context of the UE from a relevant network element of the LTE core network, and determine whether to allow the UE to access based on the context of the UE and configure necessary parameters when the UE is allowed to access.

In an embodiment of the present invention, the adjusted core network may obtain, from the network handover request, the identifier information of the network element to which the UE originally accesses the core network. Taking the core network originally accessed by the UE as the LTE core network as an example, the base station accessed when the UE is reestablished can obtain the network Element identifier of the core network originally serving the UE, i.e. the Mobility Management Entity (MME) identifier, from the UE context stored at the base station side.

In an embodiment of the present invention, the adjusted core network may obtain the context of the UE from the network element of the originally accessed core network, where the context includes authentication information of the UE and the like, and there is a difference with the context stored at the base station side. After the adjusted core network obtains the context of the UE, whether the UE is allowed to access can be determined more quickly, and the RRC connection reestablishment efficiency is improved.

Step 24, when receiving the network handover request acknowledge message sent by the adjusted core network, sending an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted type information of the core network.

In a specific implementation, the adjusted core network sends the network handover request acknowledgement message to the base station when the UE is allowed to access after acquiring the context of the UE from the core network serving the UE before the adjustment.

In a specific implementation, the RRC connection reestablishment message may include: the type information of the adjusted core network, for example, the type information of the core network may be indication information of whether the adjusted core network is a 5G core network or an LTE core network. After receiving the RRC connection reestablishment message, the UE may acquire the type of the adjusted core network, and further indicate the type of the adjusted core network to its own higher layer. The higher layer of the UE may generate NAS signaling configured according to the adjusted core network type, for example, the higher layer of the UE may generate 5G NAS signaling, and at this time, 4G NAS signaling is not generated.

In an embodiment of the present invention, the RRC connection reestablishment message further includes: and modifying the indication information of the Packet Data Convergence Protocol (PDCP) type.

In a specific implementation, after RRC connection re-establishment, the base station generally indicates to the UE to modify the PDCP type through RRC connection reconfiguration signaling. In the embodiment of the invention, the modification of the PDCP type is indicated in the RRC connection reestablishment message, and the modification of the PDCP type is not indicated by the RRC connection reconfiguration signaling after the reestablishment is completed, so that the signaling overhead can be effectively reduced.

In the implementation of the specific reestablishment process, the base station may indicate to modify the PDCP type in the RRC connection reestablishment message, regardless of whether the base station is capable of adjusting the core network to which the UE is accessed, and whether the base station is capable of adjusting the core network to which the UE is accessed. The PDCP type may be applied to a signaling radio bearer and a data radio bearer.

In a specific implementation, the PDCP type may be LTE PDCP, i.e. PDCP of LTE system, or NRPDCP, i.e. PDCP of 5G system.

In a specific implementation, when the RRC connection reestablishment message indicates to modify the PDCP type, the UE may delete the original PDCP configuration parameter and then apply the modified PDCP configuration parameter.

And step 25, when receiving the RRC connection reestablishment completion message sent by the UE, restoring the RRC connection with the UE.

In a specific implementation, the UE performs RRC connection reestablishment after receiving the RRC connection reestablishment message, and sends an RRC connection reestablishment complete message to the base station after the RRC connection reestablishment is completed. And at this point, the RRC connection between the base station and the UE is reestablished, and the UE can perform service communication with the adjusted core network.

Step 26, sending an RRC connection reestablishment message to the UE.

And when determining that the core network accessed by the UE is not adjusted, sending an RRC connection reestablishment message to the UE, so that the UE can be accessed to the originally accessed core network.

And 27, when receiving the RRC connection reestablishment completion message sent by the UE, restoring the RRC connection with the UE.

And the UE carries out RRC connection reconstruction after receiving the RRC connection reconstruction message and sends the RRC connection reconstruction completion message to the base station after the RRC connection reconstruction is completed, so that the RRC connection between the base station and the UE is reestablished, and the UE can carry out service communication with the originally accessed core network.

As can be seen from the above, in the RRC connection reestablishment method according to the embodiment of the present invention, by obtaining the state information of the currently connected core network, and determining whether to adjust the core network to which the UE is connected based on the obtained state information of the core network, the RRC connection with the UE may be reestablished based on the adjustment result, so that the UE may access the core network in a better state, and further, a better network service may be provided for the UE.

Referring to fig. 3, an embodiment of the present invention further provides a RRC connection reestablishment method, where the method may include the following steps:

step 31, sending an RRC connection reestablishment request to the base station.

In specific implementation, the UE may trigger RRC connection reestablishment due to a radio link failure caused by sudden degradation of a radio signal, and further may send an RRC connection reestablishment request to the base station in a process of initiating random access.

Step 32, when receiving the RRC connection reestablishment message sent by the base station, sending an RRC connection reestablishment complete message to the base station, reestablishing the RRC connection with the base station; wherein: the RRC connection reestablishment message includes: the indication information of the PDCP type is modified.

In a specific implementation, the base station may send an RRC connection reestablishment message to the UE after receiving the RRC connection reestablishment request. The RRC connection reestablishment message may include type information of a core network to which the UE is allowed to access.

In a specific implementation, after receiving the RRC connection reestablishment request, the base station may first obtain state information such as a load of a connected core network, and then determine whether to adjust the core network to which the UE is connected according to the obtained information, and further send an RRC connection reestablishment message to the UE based on the determination result. Of course, the base station may also directly send the RRC connection reestablishment message to the UE without determining whether to adjust the core network to which the UE accesses.

In a specific implementation, the indication information for modifying the PDCP type may be an LTE PDCP type or an NR PDCP type. And when the RRC connection reestablishment message carries the indication information for modifying the PDCP type, the UE deletes the original PDCP configuration parameters and applies the modified PDCP configuration parameters. When the RRC connection reestablishment message indicates to modify the PDCP type, necessary PDCP parameters (such as sequence length, sequencing duration, etc.) need to be configured so that the UE completes the PDCP type modification.

By indicating the PDCP type in the RRC connection reestablishment message without indicating the PDCP type through the RRC connection reconfiguration signaling, the signaling overhead can be effectively reduced.

Referring to fig. 4, an embodiment of the present invention further provides a method for indicating a PDCP type, where the method includes the following steps:

step 41, when receiving an RRC connection reestablishment request sent by a UE, sending an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the indication information of the PDCP type is modified.

In an embodiment of the present invention, the base station may first acquire state information of a core network currently connected to the base station, determine whether to adjust the core network to which the UE is connected based on the acquired state information, and generate the RRC connection reestablishment message based on a determination result.

In an embodiment of the present invention, the RRC connection reestablishment message further includes: and the adjusted type information of the core network.

And 42, when receiving the RRC connection reestablishment completion message sent by the UE, restoring the RRC connection with the UE.

In a specific implementation, the UE performs RRC connection reestablishment after receiving the RRC connection reestablishment message, and sends an RRC connection reestablishment complete message to the base station after the RRC connection reestablishment is completed. So far, the RRC connection between the base station and the UE is reestablished. When the base station adjusts the core network accessed by the UE, the UE can perform service communication with the adjusted core network. And when the base station does not adjust the core network accessed by the UE, the UE can carry out service communication with the originally accessed core network.

In the above embodiments, the base station may modify the core network accessed by the UE and modify the PDCP type through RRC connection re-establishment, or modify only the PDCP type. In fact, the above method is equally applicable to the RRC connection recovery procedure.

Referring to fig. 5, an embodiment of the present invention further provides a RRC connection recovery method, where the method may include the following steps:

step 51, when receiving an RRC connection recovery request sent by a UE, obtaining state information of a currently connected core network;

step 52, judging whether to adjust the core network accessed by the UE based on the acquired state information of the core network;

and step 53, restoring the RRC connection with the UE based on the judgment result.

In a specific implementation, the state information of the currently connected core network includes: load status information of the currently connected core network.

In a specific implementation, when it is determined to adjust a core network to which the UE accesses, a network handover request is sent to the adjusted core network, where the network handover request includes: identification information of the UE. When receiving a network switching request confirmation message sent by the adjusted core network, sending an RRC connection recovery message to the UE, where the RRC connection recovery message includes: the adjusted type information of the core network. And when receiving an RRC connection recovery completion message sent by the UE, recovering the RRC connection with the UE.

In a specific implementation, the network handover request further includes: network element identification information of a core network serving the UE before the adjustment.

In a specific implementation, the adjusted core network sends the network handover request acknowledgement message after acquiring the context of the UE from a network element of the core network serving the UE before the adjustment.

In a specific implementation, when it is determined that the core network to which the UE accesses is not adjusted, an RRC connection recovery message is sent to the UE. And when receiving an RRC connection recovery completion message sent by the UE, recovering the RRC connection with the UE.

In a specific implementation, when the UE sends the RRC connection recovery request, the RRC connection recovery message may further include: the indication information of the PDCP type is modified. The base station may modify a core network accessed by the UE and modify a PDCP type or only modify the PDCP type through an RRC connection resume message. When the UE receives the RRC connection recovery message, it may simultaneously know the modified core network and PDCP type, or only know the modified PDCP type, and further send an RRC connection recovery complete message to the base station to recover the RRC connection with the base station.

In order to make the present invention better understood and realized by those skilled in the art, the following detailed description is provided for a device and a computer readable storage medium corresponding to the above method.

Referring to fig. 6, an embodiment of the present invention further provides a base station 60, where the base station 60 may include: an acquisition unit 61, a judgment unit 62 and a reconstruction unit 63. Wherein:

the acquiring unit 61 is adapted to acquire the state information of the currently connected core network when receiving an RRC connection reestablishment request sent by the UE;

the judging unit 62 is adapted to judge whether to adjust the core network to which the UE is accessed based on the acquired state information of the core network;

the reestablishing unit 63 is adapted to reestablish the RRC connection with the UE based on the determination result.

In an embodiment of the present invention, the state information of the currently connected core network, acquired by the acquiring unit 61, includes: load status information of the currently connected core network.

In an embodiment of the present invention, the reconstruction unit 63 may include:

a first sending subunit 631, adapted to, when determining to adjust a core network to which the UE accesses, send a network handover request to the adjusted core network, where the network handover request includes: identification information of the UE;

a second sending subunit 632, adapted to send, when receiving the network handover request acknowledgement message sent by the adjusted core network, an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted identification information of the network element of the core network;

a first reestablishment subunit 633, configured to, when receiving an RRC connection reestablishment complete message sent by the UE, resume an RRC connection with the UE.

In an embodiment of the present invention, the network handover request sent by the first sending subunit 631 further includes: identification information of a network element of a core network serving the UE before the adjustment.

In an embodiment of the present invention, the network handover request acknowledge message is sent by the core network after the adjustment by obtaining a context of the UE from a network element of the core network serving the UE before the adjustment.

In an embodiment of the present invention, the RRC connection reestablishment message may further include: the indication information of the PDCP type is modified.

In an embodiment of the present invention, the PDCP type may include: LTE PDCP or NR PDCP.

In an embodiment of the present invention, the reconstruction unit 63 may include: a third transmitting subunit (not shown) and a first reconstruction subunit (not shown). Wherein:

the third sending subunit is adapted to send an RRC connection reestablishment message to the UE when it is determined that the core network to which the UE is accessed is not adjusted;

the first reestablishment subunit is adapted to, when receiving an RRC connection reestablishment complete message sent by the UE, resume the RRC connection with the UE.

Referring to fig. 7, an embodiment of the present invention further provides a user terminal 70, where the user terminal 70 may include: a first transmission unit 71 and a second transmission unit 72. Wherein:

the first sending unit 71 is adapted to send an RRC connection reestablishment request to the base station;

the second sending unit 72 is adapted to send an RRC connection reestablishment complete message to the base station to reestablish the RRC connection with the base station when receiving the RRC connection reestablishment message sent by the base station; wherein: the RRC connection reestablishment message includes: the indication information of the PDCP type is modified.

Referring to fig. 8, an embodiment of the present invention further provides another base station 80, where the base station 80 may include: a third transmitting unit 81 and a receiving unit 82. Wherein:

the third sending unit 81 is adapted to send an RRC connection reestablishment message to the UE when receiving an RRC connection reestablishment request sent by the UE, where the RRC connection reestablishment message includes: modifying the indication information of the PDCP type;

the receiving unit 82 is adapted to recover the RRC connection with the UE when receiving the RRC connection reestablishment complete message sent by the UE.

In an embodiment of the present invention, the third sending unit 81 is adapted to obtain status information of a currently connected core network, determine whether to adjust the core network to which the UE is connected based on the obtained information, and send the RRC connection reestablishment message based on a determination result.

In an embodiment of the present invention, the RRC connection reestablishment message sent by the third sending unit 81 further includes: and the adjusted type information of the core network.

An embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of any RRC connection reestablishment method in the foregoing embodiments are executed.

The embodiment of the present invention further provides another computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of any one of the PDCP type indication methods in the foregoing embodiments are executed.

In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

The embodiment of the present invention further provides a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of any one of the RRC connection reestablishment methods in the foregoing embodiments when executing the computer instructions.

The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of any one of the PDCP type indication methods in the foregoing embodiments when executing the computer instructions.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An RRC connection reestablishment method, comprising:

when a base station receives an RRC connection reestablishment request sent by UE, acquiring the state information of a plurality of core networks currently connected with the base station;

the base station judges whether to adjust the core network accessed by the UE based on the acquired state information of the core network;

the base station reestablishes RRC connection with the UE based on the judgment result, including: when determining to adjust the core network accessed by the UE, sending a network switching request to the adjusted core network, wherein the network switching request comprises: identification information of the UE; when receiving the network switching request confirmation message sent by the adjusted core network, sending an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted type information of the core network.

2. The RRC connection reestablishment method according to claim 1, wherein the state information of the currently connected core network includes: load status information of the currently connected core network.

3. The RRC connection reestablishment method according to claim 1, wherein the base station reestablishes the RRC connection with the UE based on the determination result, further comprising:

and when the base station receives the RRC connection reestablishment completion message sent by the UE, the base station restores the RRC connection with the UE.

4. The RRC connection reestablishment method according to claim 3, wherein the network handover request further includes: network element identification information of a core network serving the UE before the adjustment.

5. The RRC connection reestablishment method according to claim 3, wherein the adjusted core network sends the network handover request confirm message by obtaining the context of the UE from a network element of the core network serving the UE before the adjustment.

6. The RRC connection reestablishment method according to claim 3, wherein the RRC connection reestablishment message further includes: the indication information of the PDCP type is modified.

7. The RRC connection reestablishment method of claim 6, wherein the PDCP type includes: LTE PDCP or NR PDCP.

8. The RRC connection reestablishment method according to claim 1, wherein the reestablishing, by the base station, the RRC connection with the UE based on the determination result includes:

when the base station determines not to adjust the core network accessed by the UE, sending an RRC connection reestablishment message to the UE;

9. An RRC connection recovery method, comprising:

when a base station receives an RRC connection recovery request sent by UE, acquiring the state information of a plurality of core networks currently connected with the base station;

the base station recovering the RRC connection with the UE based on the judgment result comprises the following steps: when determining to adjust the core network accessed by the UE, sending a network switching request to the adjusted core network, wherein the network switching request comprises: identification information of the UE; when receiving a network switching request confirmation message sent by the adjusted core network, sending an RRC connection recovery message to the UE, where the RRC connection recovery message includes: the adjusted type information of the core network.

10. The RRC connection recovery method of claim 9, wherein the state information of the currently connected core network includes: load status information of the currently connected core network.

11. The RRC connection recovery method of claim 9, wherein the base station recovers the RRC connection with the UE based on the determination result, further comprising:

and when the base station receives the RRC connection recovery completion message sent by the UE, recovering the RRC connection with the UE.

12. The RRC connection recovery method of claim 11, wherein the network handover request further includes: network element identification information of a core network serving the UE before the adjustment.

13. The RRC connection recovery method of claim 11, wherein the adjusted core network sends the network handover request confirm message by obtaining the context of the UE from a network element of a core network serving the UE before the adjustment.

14. The RRC connection recovery method of claim 11, wherein the RRC connection recovery message further includes: the indication information of the PDCP type is modified.

15. The RRC connection recovery method of claim 14, wherein the PDCP type includes: LTE PDCP or NR PDCP.

16. The RRC connection recovery method of claim 9, wherein the base station recovering the RRC connection with the UE based on the determination result includes:

when the base station determines not to adjust the core network accessed by the UE, sending an RRC connection re-recovery message to the UE;

17. A base station, comprising:

the base station comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is suitable for acquiring the state information of a plurality of core networks currently connected with the base station when the base station receives an RRC connection reestablishment request sent by UE;

a judging unit, adapted to judge whether to adjust a core network to which the UE is accessed based on the acquired state information of the core network;

a reestablishing unit adapted to reestablish an RRC connection with the UE based on the determination result;

the reconstruction unit includes: a first sending subunit, adapted to send, when it is determined to adjust a core network to which the UE accesses, a network handover request to the adjusted core network, where the network handover request includes: identification information of the UE; a second sending subunit, adapted to send, when receiving the network handover request acknowledgement message sent by the adjusted core network, an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message includes: the adjusted type information of the core network.

18. The base station of claim 17, wherein the status information of the currently connected core network acquired by the acquiring unit comprises: load status information of the currently connected core network.

19. The base station of claim 17, wherein the reconstruction unit further comprises:

the first reestablishment subunit is adapted to, when receiving an RRC connection reestablishment completion message sent by the UE, resume the RRC connection with the UE.

20. The base station of claim 19, wherein the network handover request sent by the first sending subunit further comprises: network element identification information of a core network serving the UE before the adjustment.

21. The base station of claim 19, wherein the network handover request confirm message is sent by the adjusted core network after obtaining the context of the UE from a network element of a core network serving the UE before the adjustment.

22. The base station of claim 19, wherein the RRC connection resume message further comprises: the indication information of the PDCP type is modified.

23. The base station of claim 22, wherein the PDCP type comprises: LTE PDCP or NR PDCP.

24. The base station of claim 17, wherein the reconstruction unit comprises:

a third sending subunit, adapted to send an RRC connection recovery message to the UE when it is determined that the core network to which the UE is accessed is not adjusted;

the first reestablishment subunit is suitable for resuming the RRC connection with the UE when the RRC connection resuming completion message sent by the UE is received.

25. A computer-readable storage medium, on which a computer program is stored, the computer program causing a computer to perform the method according to any one of claims 1 to 8.

26. A base station comprising a memory and a processor, characterized in that the memory has stored thereon a computer program operable on the processor to cause the processor to perform the method according to any of claims 1 to 8.