CN109362109B

CN109362109B - Method and device for recovering proprietary bearer of mobile terminal in S1 handover process

Info

Publication number: CN109362109B
Application number: CN201811417706.2A
Authority: CN
Inventors: 马婷; 邵鹄; 颜志凌
Original assignee: Wuhan Hongxin Technology Development Co Ltd
Current assignee: Wuhan Hongxin Technology Development Co Ltd
Priority date: 2018-11-26
Filing date: 2018-11-26
Publication date: 2022-01-11
Anticipated expiration: 2038-11-26
Also published as: CN109362109A

Abstract

The embodiment of the invention provides a method and a device for recovering a proprietary bearer of a mobile terminal in an S1 switching process. In the method, a PGW side introduces a data structure to store special bearing information of UE, wherein the special bearing information comprises bearing information under a special bearing scene initiated by the UE actively and bearing information under a special bearing scene initiated by a network side. And only restoring the default bearer in the switching process, and after the switching is finished, multiplexing the PGW to initiate a special bearer flow to realize the restoration of the UE special bearer. The embodiment of the invention only recovers the default load during the switching, recovers the special load after the switching is finished, reduces the complexity, reduces the flow design by multiplexing the protocol flow specified by the 3GPP, is simple and stable to realize, recovers the special load of the UE and meets the requirement of the quality of service (QoS) before the switching.

Description

Method and device for recovering proprietary bearer of mobile terminal in S1 handover process

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a method and a device for recovering a special bearer of a mobile terminal in an S1 switching process.

Background

A cross-Mobility Management Entity (MME) S1 handover procedure, which relates to interworking messages of many network elements including a source/destination base station, a source/destination MME, a source/destination SGW, and a PGW. The process has many message flows, and each network element point may fail, so that the dedicated bearer cannot be successfully established or part of the dedicated bearer cannot be successfully established.

Particularly, in a scenario of processing a part of dedicated bearers successfully established, each network element fails at a certain point, and then the network element needs to update and restore the information of the bearers, and so on. After the completion, the failed bearer needs to be notified to an upper network element, i.e., a Serving Gateway (SGW) and a packet data Gateway (PDN Gateway, PGW), so as to ensure the consistency of the bearer information of each network element. It can be said that the abnormal scenes are quite many, and the design processing flow is quite complex, so that the stability is affected and the scenes are limited. How to guarantee to recover the dedicated bearer of the UE after the S1 handover so as to meet the quality of service (QoS) requirement before the handover is an urgent problem to be solved in the industry.

Disclosure of Invention

To solve the technical problem in the prior art, embodiments of the present invention provide a method and an apparatus for recovering a dedicated bearer of a mobile terminal in an S1 handover process

In a first aspect, an embodiment of the present invention provides a method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure, including:

only restoring the default bearer in the S1 switching process of the mobile terminal, and after the switching is successful, if the PGW judges that the special bearer information corresponding to the mobile terminal is locally stored, acquiring the special bearer information;

and the PGW is multiplexed to initiate a special bearer establishment flow according to the special bearer information, so that the recovery of the special bearer of the mobile terminal is realized.

In a second aspect, an embodiment of the present invention provides another method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure, including:

receiving default bearer information and special bearer information sent by a source MME in the S1 switching process of the mobile terminal;

and after the default bearer is recovered according to the default bearer information, the special bearer information is not processed, so that after the switching is successful, the PGW initiates a special bearer establishment flow for the mobile terminal according to the obtained special bearer information.

In a third aspect, an embodiment of the present invention provides a PGW device, including:

the first processing module is configured to recover only a default bearer in an S1 handover process of the mobile terminal, and after the handover is successful, if the PGW determines that the dedicated bearer information corresponding to the mobile terminal is locally stored, obtain the dedicated bearer information;

and the second processing module is configured to multiplex the PGW to initiate a dedicated bearer establishment procedure according to the dedicated bearer information, so as to implement recovery of the dedicated bearer of the mobile terminal.

In a fourth aspect, an embodiment of the present invention provides an objective MME device, including:

a third processing module, configured to receive default bearer information and dedicated bearer information sent by a source MME during an S1 handover procedure of a mobile terminal;

and the fourth processing module is configured to not process the dedicated bearer information after the default bearer is recovered according to the default bearer information, so that after the handover is successful, the PGW initiates a dedicated bearer establishment procedure for the mobile terminal according to the acquired dedicated bearer information.

In a fifth aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method according to the first aspect or the second aspect when executing the program.

In a sixth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method as provided in the first or second aspect.

According to the method and the device for recovering the proprietary bearer of the mobile terminal in the S1 switching process, the PGW side introduces the data structure to store the proprietary bearer information of the UE, wherein the proprietary bearer information comprises the bearer information under the condition that the UE actively initiates the proprietary bearer, and the bearer information under the condition that the network side initiates the proprietary bearer. And only restoring the default bearer in the switching process, and after the switching is finished, multiplexing the PGW to initiate a special bearer flow to realize the restoration of the UE special bearer. The embodiment of the invention only recovers the default load during the switching, recovers the special load after the switching is finished, reduces the complexity, reduces the flow design by multiplexing the protocol flow specified by the 3GPP, is simple and stable to realize, recovers the special load of the UE and meets the requirement of the quality of service (QoS) before the switching.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for recovering a dedicated bearer of a mobile terminal in an S1 handover process according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure according to another embodiment of the present invention;

fig. 3 is a schematic flow chart of establishing a dedicated bearer by a PGW according to an embodiment of the present invention;

fig. 4 is a schematic composition diagram of a PGW apparatus according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a destination MME device according to an embodiment of the present invention;

fig. 6 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to better recover the service quality of a service after S1 handover of a User Equipment (UE), an embodiment of the present invention provides a method for recovering a dedicated bearer in an S1 handover process. The method not only simplifies the realization of the switching process, but also realizes the recovery of the special bearing after switching by multiplexing the PGW to initiate the establishment of the special bearing process.

Fig. 1 is a flowchart illustrating a method for recovering a dedicated bearer of a mobile terminal in an S1 handover process according to an embodiment of the present invention, where as shown in fig. 1, the method is executed by a PGW, and specifically includes the following steps:

step 100, only restoring a default bearer in an S1 handover process of a mobile terminal, and after the handover is successful, if the PGW determines that the dedicated bearer information corresponding to the mobile terminal is locally stored, acquiring the dedicated bearer information;

step 101, the PGW initiates a dedicated bearer establishment procedure according to the dedicated bearer information, so as to implement recovery of the dedicated bearer of the mobile terminal.

The method provided by the embodiment of the invention can be used for solving the problem that the S1 switching process recovers the special bearer in the scene of interconnection, namely, under the scenes of independent network elements such as MME, SGW and PGW and 3GPP standard interfaces such as S6a, S10 and S5/S8, thereby meeting the requirement of Quality of Service (QoS) of the user equipment UE before switching.

The scenario of establishing the dedicated bearer by the UE has two types, namely, active initiation and network side initiation, so that the two scenarios need to be taken into account when the UE switches to the recovered dedicated bearer. In this embodiment of the present invention, the dedicated bearer information includes first-type dedicated bearer information and/or second-type dedicated bearer information, where the first-type dedicated bearer information is information of a dedicated bearer initiated and established by the mobile terminal actively, and the second-type dedicated bearer information is information of a dedicated bearer initiated and established by the PGW. That is, the UE may have established two types of dedicated bearers before handover, one type is initiated by the UE itself, and the dedicated bearer information corresponding to this scenario is referred to as first type of dedicated bearer information; the other network side initiates, and the special bearing information corresponding to the scene is called as second special bearing information. It will be appreciated that the two types of dedicated bearers are independent of each other, i.e. there may be both types of dedicated bearers or only one of them. The embodiment of the present invention is not limited thereto. Before switching, the special bearing information of the UE is stored in PGW locally according to two scenes, and only the default bearing is recovered in the switching process. After the handover is completed, the PGW initiates a dedicated bearer establishment procedure.

The PGW may store the first type of proprietary bearer information and/or the second type of proprietary bearer information according to a preset configuration manner, and add corresponding identifiers to the first type of proprietary bearer information and the second type of proprietary bearer information, respectively. The identifier may be used to indicate to which class of proprietary information the stored proprietary bearer information belongs. During storage, the IMSI number of the UE may be used as an index value to store the first type of dedicated bearer information and/or the second type of dedicated bearer information. Therefore, when the multiplexing PGW establishes the special bearer flow, the special bearer information corresponding to the UE can be conveniently acquired according to the IMSI.

Specifically, after the UE attach is completed, if the UE actively initiates establishment of the dedicated bearer, after the bearer establishment is completed, the PGW side stores the dedicated bearer information by using the IMSI of the user as an index value (key value). That is, in the process of actively establishing the dedicated Bearer by the UE, when the flow proceeds to the last PGW side and receives the Create Bearer Response message, the PGW stores the required information in the data structure, and the identifier indicates that the Bearer information is actively established by the UE. If the PGW side initiates the dedicated bearer establishment, the PGW side also stores the corresponding dedicated bearer information. Similarly, the private bearer information can be stored by using the IMSI as an index value (key value), and the identifier indicates that the bearer information is established for the network side.

Policy Control and Charging (PCC) rule information is combined into a user rule group category, and is matched with corresponding users according to actual requirements. In the embodiment of the present invention, the dedicated bearer information may be stored locally in the PGW in the following preset configuration manner.

Subscription information table of UE

IMSI

Uplink/downlink AMBR

UEIP

Rule group ID

PCC rules are presented by the following tables:

rule set

Rules

Filter

The specific configuration may not be limited thereto. The design form is not fixed, as long as the establishment of the special bearing information can be stored according to the requirement of the protocol.

And then the UE initiates switching, and the switching process recovers the default bearer of the user according to the protocol flow. In the cross-MME switching, the source MME transmits the bearing information of the UE including default bearing and special bearing information to the target MME by issuing a Forward location Request message. And the target MME switches the flow according to the protocol flow and recovers the default bearer, but the special bearer information is not processed for the moment. Therefore, each switching flow point has an abnormal scene that some load bearing can not be established without consideration, and the design is simple. The complex scene of successful establishment of the partially proprietary bearer is not considered.

After the switching is successful, that is, the PGW receives the Modify Bearer Request message, first replies a Modify Bearer response message to the target SGW, and then starts initiating the dedicated Bearer establishment procedure. And the PGW sends a Create beer Request message to trigger a special Bearer establishment flow according to the protocol flow. The specific dedicated bearer information is from two parts, one part is dedicated bearer information corresponding to a bearer actively established by the UE, and the other part is dedicated bearer information corresponding to a bearer locally initiated by the PGW side according to the configuration. After the PGW obtains the two types of special Bearer information (if both types of special Bearer information exist), the PGW fills the special Bearer information in a Create Bearer Request message, and sends the created Bearer Request message to the target SGW after the S1 handover, and the PGW is multiplexed to initiate a special Bearer flow. The normal and abnormal scenes are covered in the multiplexing process, and the realization is simple. By this point, the establishment of the dedicated bearer is completed, that is, the recovery of the dedicated bearer in the S1 handover process is realized.

Fig. 2 is a flowchart illustrating a method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure according to another embodiment of the present invention, where as shown in fig. 2, the method is executed by a destination MME, and specifically includes the following steps:

step 200, receiving default bearer information and proprietary bearer information sent by a source MME in the S1 switching process of the mobile terminal;

step 201, after recovering the default bearer according to the default bearer information, not processing the dedicated bearer information, so that after the handover is successful, the PGW initiates a dedicated bearer establishment procedure for the mobile terminal according to the acquired dedicated bearer information.

In the process of S1 handover of the UE, the handover process recovers the default bearer of the user according to the protocol flow. In the cross-MME switching, the source MME transmits the bearing information of the UE including default bearing and special bearing information to the target MME by issuing a Forward location Request message. And the target MME switches the flow according to the protocol flow and recovers the default bearer, but the special bearer information is not processed for the moment. Therefore, each switching flow point has an abnormal scene that some load bearing can not be established without consideration, and the design is simple. The complex scene of successful establishment of the partially proprietary bearer is not considered. Since the dedicated bearer is not recovered on the destination MME side, the procedure is implemented by multiplexing the PGW after the S1 handover is completed. Specifically, after the PGW is successfully switched, two types of dedicated bearer information are acquired, and a dedicated bearer establishment procedure is initiated for the UE.

In the method for recovering the proprietary bearer of the mobile terminal in the S1 handover process provided by the embodiment of the present invention, the PGW side introduces a data structure to store the proprietary bearer information of the UE, including the bearer information in the scenario where the UE actively initiates the proprietary bearer, and also including the bearer information in the scenario where the network side initiates the proprietary bearer. And only restoring the default bearer in the switching process, and after the switching is finished, multiplexing the PGW to initiate a special bearer flow to realize the restoration of the UE special bearer. The embodiment of the invention only recovers the default load during the switching, recovers the special load after the switching is finished, reduces the complexity, reduces the flow design by multiplexing the protocol flow specified by the 3GPP, is simple and stable to realize, recovers the special load of the UE and meets the requirement of the quality of service (QoS) before the switching.

The method of the embodiments of the present invention is described in further detail below with a specific example. The embodiment of the invention is used for solving the problem that the UE recovers the special bearing in the S1 switching process, and provides the method for storing the information of the corresponding special bearing according to different scenes through a PGW side. And after the default bearer is recovered in the switching process and the switching is successful, multiplexing the PGW to initiate a method of establishing a special bearer flow. The specific implementation mode is as follows:

1. the configuration of the dedicated bearer is firstly performed in the PGW side database, and the specific configuration is as follows.

Subscription information table of UE

IMSI	Uplink/downlink AMBR	UEIP	Rule group ID
				460400000000001	819200/819200<kbs/s>	30.30.30.5	0

Rule set

Rule group ID	Rule group name	Number of rules contained in a rule set	Rule name	1	Rule name 2
						0	metro	2	CBTC	TSI&ETS

Rules

Filter

2. After the UE attach procedure is completed, if the UE actively establishes the dedicated bearer, in the process of establishing the dedicated bearer, the PGW side creates a data structure for storing the dedicated bearer information established in this scenario, so as to prepare for subsequent handover. The specific data structure is not taken as an example, and the specific data structure can be designed according to an actual framework.

3. The UE starts handover across MME S1, and performs the handover procedure according to the protocol specification, only recovers the default bearer in the procedure. After the switching is completed, the target SGW sends a Modify Bearer Request message to the PGW. After receiving the message, the PGW replies to the SGW Modify Bearer response message. And multiplexing the existing PGW dedicated bearer establishment procedure (see fig. 3 in particular). When initiating the special bearer establishment, judging whether bearer information actively established by the UE exists or not, and if so, establishing the bearer information together with the special bearer configured on the PGW side; and if not, only establishing the corresponding special bearing according to the PGW configuration.

Fig. 4 is a schematic composition diagram of a PGW device according to an embodiment of the present invention, and as shown in fig. 4, the PGW includes a first processing module 401 and a second processing module 402, where:

the first processing module 401 is configured to, in an S1 handover process of the mobile terminal, only recover a default bearer and, after successful handover, if the PGW determines that the dedicated bearer information corresponding to the mobile terminal is locally stored, acquire the dedicated bearer information; the second processing module 402 is configured to multiplex the PGW to initiate a dedicated bearer establishment procedure according to the dedicated bearer information, so as to implement recovery of the dedicated bearer of the mobile terminal.

The embodiment of the apparatus may be specifically configured to execute the method embodiment shown in fig. 1, and specific functions are described in the method embodiment, which is not described herein again.

Fig. 5 is a schematic composition diagram of a destination MME device according to an embodiment of the present invention, and as shown in fig. 5, the destination MME includes a third processing module 501 and a fourth processing module 502, where:

the third processing module 501 is configured to receive default bearer information and dedicated bearer information sent by a source MME during an S1 handover procedure of the mobile terminal; the fourth processing module 502 is configured to not process the dedicated bearer information after the default bearer is recovered according to the default bearer information, so that after the handover is successful, the PGW initiates a dedicated bearer establishment procedure for the mobile terminal according to the acquired dedicated bearer information.

The embodiment of the apparatus may be specifically configured to execute the method embodiment shown in fig. 2, and specific functions are described in the method embodiment, which is not described herein again.

In the embodiments of the present invention, the PGW side introduces a data structure to store the dedicated bearer information of the UE, where the dedicated bearer information includes the bearer information in the scenario where the UE actively initiates the dedicated bearer, and also includes the bearer information in the scenario where the network side initiates the dedicated bearer. And in the switching process, the target MME only restores the default bearer, and after the switching is finished, the PGW is multiplexed to initiate a special bearer flow to realize the restoration of the UE special bearer. The embodiment of the invention only recovers the default load during the switching, recovers the special load after the switching is finished, reduces the complexity, reduces the flow design by multiplexing the protocol flow specified by the 3GPP, is simple and stable to realize, recovers the special load of the UE and meets the requirement of the quality of service (QoS) before the switching.

Fig. 6 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, the electronic device may include: a processor (processor)610, a communication Interface (Communications Interface)620, a memory (memory)630 and a communication bus 640, wherein the processor 610, the communication Interface 620 and the memory 630 communicate with each other via the communication bus 640. The processor 610 may invoke a computer program stored on the memory 630 and executable on the processor 610 to perform the methods provided by the various embodiments described above, including, for example: only restoring the default bearer in the S1 switching process of the mobile terminal, and after the switching is successful, if the PGW judges that the special bearer information corresponding to the mobile terminal is locally stored, acquiring the special bearer information; and the PGW is multiplexed to initiate a special bearer establishment flow according to the special bearer information, so that the recovery of the special bearer of the mobile terminal is realized. Or the like, or, alternatively,

receiving default bearer information and special bearer information sent by a source MME in the S1 switching process of the mobile terminal; and after the default bearer is recovered according to the default bearer information, the special bearer information is not processed, so that after the switching is successful, the PGW initiates a special bearer establishment flow for the mobile terminal according to the obtained special bearer information.

In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and the method includes: only restoring the default bearer in the S1 switching process of the mobile terminal, and after the switching is successful, if the PGW judges that the special bearer information corresponding to the mobile terminal is locally stored, acquiring the special bearer information; and the PGW is multiplexed to initiate a special bearer establishment flow according to the special bearer information, so that the recovery of the special bearer of the mobile terminal is realized. Or the like, or, alternatively,

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure, comprising:

multiplexing the PGW to initiate a special bearer establishment flow according to the special bearer information by the PGW, thereby realizing the recovery of the special bearer of the mobile terminal;

the dedicated bearer information includes first type of dedicated bearer information and/or second type of dedicated bearer information, the first type of dedicated bearer information is information of a dedicated bearer initiated and established by the mobile terminal actively, and the second type of dedicated bearer information is information of a dedicated bearer initiated and established by the PGW;

the method further comprises the following steps:

storing the first type of proprietary bearer information and/or the second type of proprietary bearer information according to a preset configuration mode, and respectively adding corresponding identifiers for the first type of proprietary bearer information and the second type of proprietary bearer information; the identifier is used for indicating that the stored special bearing information belongs to the first type of special bearing information or the second type of special bearing information;

the method further comprises the following steps:

storing the first type of proprietary bearer information and/or the second type of proprietary bearer information by taking the IMSI number of the mobile terminal as an index value;

the storing the first type of proprietary bearer information and/or the second type of proprietary bearer information according to a preset configuration mode includes:

after the S1 handover of the mobile terminal is completed, the PGW stores the first type of proprietary bearer information and/or the second type of proprietary bearer information after the bearer establishment is completed under the condition that the mobile terminal actively initiates the establishment of the proprietary bearer; and under the condition that the PGW initiates the establishment of the special bearing, the PGW stores the first type of special bearing information and/or the second type of special bearing information.

2. The method of claim 1, wherein the multiplexing PGW initiates a dedicated bearer establishment procedure according to the dedicated bearer information, includes:

and the PGW adds the dedicated bearer information to a bearer establishment request message, and sends the message to the target SGW after S1 handover, thereby initiating a dedicated bearer establishment procedure.

3. A method for recovering a dedicated bearer of a mobile terminal in an S1 handover procedure, comprising:

after the default bearer is recovered according to the default bearer information, the special bearer information is not processed, so that after the switching is successful, the PGW initiates a special bearer establishment flow for the mobile terminal according to the obtained special bearer information;

the PGW is used for storing the first type of proprietary bearer information and/or the second type of proprietary bearer information according to a preset configuration mode, and adding corresponding identifiers to the first type of proprietary bearer information and the second type of proprietary bearer information respectively; the identifier is used for indicating that the stored special bearing information belongs to the first type of special bearing information or the second type of special bearing information;

the PGW is specifically configured to store the first type of dedicated bearer information and/or the second type of dedicated bearer information after the PGW is used for, after the S1 handover of the mobile terminal is completed, and under the condition that the mobile terminal actively initiates establishment of a dedicated bearer; storing the first type of proprietary bearer information and/or the second type of proprietary bearer information under the condition that a PGW initiates the establishment of the proprietary bearer;

the PGW is further configured to store the first type of proprietary bearer information and/or the second type of proprietary bearer information with an IMSI number of the mobile terminal as an index value.

4. A PGW device, comprising:

a second processing module, configured to multiplex a PGW to initiate a dedicated bearer establishment procedure according to the dedicated bearer information, so as to implement recovery of the dedicated bearer of the mobile terminal;

the first processing module is further configured to store the first type of proprietary bearer information and/or the second type of proprietary bearer information according to a preset configuration manner, and add corresponding identifiers to the first type of proprietary bearer information and the second type of proprietary bearer information respectively; the identifier is used for indicating that the stored special bearing information belongs to the first type of special bearing information or the second type of special bearing information;

the first processing module is further configured to store the first type of proprietary bearer information and/or the second type of proprietary bearer information with the IMSI number of the mobile terminal as an index value;

the first processing module is specifically configured to:

after S1 switching of the mobile terminal is completed, under the condition that the mobile terminal actively initiates establishment of a special bearing, after the bearing establishment is completed, storing the first-type special bearing information and/or the second-type special bearing information; and under the condition that the PGW initiates the establishment of the special bearing, storing the first type of special bearing information and/or the second type of special bearing information.

5. A destination MME device, comprising:

a fourth processing module, configured to recover a default bearer according to the default bearer information, and then not process the dedicated bearer information, so that after the handover is successful, the PGW initiates a dedicated bearer establishment procedure for the mobile terminal according to the acquired dedicated bearer information;

6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 3 are implemented when the processor executes the program.

7. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.