CN114666854B - PDU session information recovery method and terminal - Google Patents
PDU session information recovery method and terminal Download PDFInfo
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- CN114666854B CN114666854B CN202210100889.5A CN202210100889A CN114666854B CN 114666854 B CN114666854 B CN 114666854B CN 202210100889 A CN202210100889 A CN 202210100889A CN 114666854 B CN114666854 B CN 114666854B
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- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007711 solidification Methods 0.000 claims abstract description 41
- 230000008023 solidification Effects 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 41
- 238000012795 verification Methods 0.000 claims abstract description 14
- 230000006870 function Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 238000012217 deletion Methods 0.000 claims description 5
- 230000037430 deletion Effects 0.000 claims description 5
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
- H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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Abstract
The invention provides a PDU session information recovery method and a terminal, comprising the following steps: the SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to the UPF network element; the UPF network element solidifies and stores the PDU session information; and when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way. The invention carries out solidification storage on PDU conversation information issued by the SMF network element through the UPF network element, can automatically and locally recover the PDU conversation information solidified and stored by the UPF network element after the UPF network element is restarted, and reports the recovered PDU conversation information to the SMF network element for verification so as to ensure the accuracy of the recovered PDU conversation information, and continuously provide business service for user equipment without reestablishing PDU conversation, thereby greatly reducing the processing pressure of a 5G core network.
Description
Technical Field
The invention relates to the technical field of 5G network communication, in particular to a PDU session information recovery method and a terminal.
Background
In fifth generation mobile communication (5G) networks, a User Equipment (UE) needs to establish a PDU session, i.e. a data transmission channel between the UE and the data network, in order to communicate with the Data Network (DN).
In the 5G system architecture, a User Plane Function (UPF) is a data forwarding plane of the 5G core network system, and is used to forward data traffic packets of a processing user in the 5G network.
PDU conversation of user equipment is mainly managed and maintained by conversation management function entity (SMF) of 5G core network, when PDU conversation is established, SMF network element creates PDU conversation information such as data detection and forwarding rule for PDU conversation, and sends it to UPF network element for execution.
In the current application, when the UPF network element fails, the processing method generally restarts the UPF network element, and when the UPF network element restarts, the PDU session information on the UPF network element is generally restored by guiding the user equipment to reestablish the PDU session. In the recovery mode, under the condition of more user equipment, a large number of user equipment re-apply for establishing PDU session, and a large processing pressure is caused to the 5G core network.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a PDU session information recovery method and terminal are provided, omitting the process of user equipment re-establishing PDU session, thereby relieving the processing pressure of core network.
In order to solve the technical problems, the invention adopts the following technical scheme:
a PDU conversation information recovery method includes the steps:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information;
and S3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way.
In order to solve the technical problems, the invention adopts another technical scheme that:
a recovery terminal for PDU session information, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information;
and S3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way.
The invention has the beneficial effects that: the invention provides a PDU conversation information restoring method and a terminal, which solidify and store PDU conversation information issued by an SMF network element through a UPF network element, and can locally restore PDU conversation information solidified and stored through the UPF network element after the UPF network element is restarted after faults, so that service is continuously provided for user equipment, the user equipment does not need to reestablish PDU conversation, and the processing pressure of a 5G core network is greatly reduced.
Drawings
Fig. 1 is a flowchart of a method for recovering PDU session information according to an embodiment of the present invention;
FIG. 2 is a flowchart of establishing, storing and recovering a PDU session in PDU session information according to an embodiment of the present invention;
fig. 3 is a flowchart of a self-recovery of a UPF network element side in PDU session information according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a recovery terminal of PDU session information according to an embodiment of the present invention.
Description of the reference numerals:
1. a recovery terminal of PDU session information; 2. a memory; 3. a processor.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 3, a method for recovering PDU session information includes the steps of:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information;
and S3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way.
From the above description, the beneficial effects of the invention are as follows: PDU session information issued by the SMF network element is solidified and stored through the UPF network element, when the UPF network element is restarted due to faults, the PDU session information solidified and stored through the UPF network element can be automatically recovered locally, service is continuously provided for the user equipment, the user equipment does not need to reestablish PDU session, and the processing pressure of the 5G core network is greatly reduced.
Further, the S2 specifically is:
s21, the PDU session management module of the UPF network element receives the PDU session information and analyzes the PDU session information;
s22, the PDU session management module sends the analyzed PDU session information to a PDU session application module and a PDU session solidification storage module respectively.
The above description shows that the UPF network element is divided into three functional modules, namely, a PDU session management module, a PDU session application module and a PDU session solidification storage module, which respectively analyze and distribute PDU session information, establish a data transmission channel between application PDU session information and user equipment, solidify and store PDU session information, and ensure that PDU session information is not lost from local storage due to restarting of the UPF network element.
Further, the step S3 specifically includes:
when the UPF network element fails, restarting the UPF network element, judging whether the UPF network element starts a PDU session self-recovery function or not by the PDU session management module, if so, automatically reading the PDU session information in the PDU session solidification storage module by the PDU session management module, and sending the PDU session information to the PDU session application module;
otherwise, the PDU session management module sends a session clearing request to the PDU session solidification storage module, and the PDU session solidification storage module deletes all the PDU session information stored in a solidification way.
As can be seen from the above description, when the failure of the UPF network element requires restarting, whether to start the PDU session self-recovery function is determined first, and then whether to recover the local PDU session information is determined according to the determination result, so as to improve the efficiency of information interaction with the user equipment, and at the same time, clean the PDU session information that does not need to be recovered in time to avoid occupying the local buffer.
Further, the step S3 further includes the steps of:
s4, the UPF network element reports the acquired PDU session information to the SMF network element, the SMF network element compares whether the PDU session information sent from the PDU session application module is consistent with the PDU session information stored by the UPF network element, if so, check success information is returned to the PDU session management module, and the PDU session information in the PDU session application module is successfully recovered;
if the PDU session information is inconsistent, returning verification failure information to the PDU session management module, wherein the verification failure information comprises the ID information of the abnormal PDU session information, the PDU session management module sends PDU session deletion information with the ID information to the PDU session application module and the PDU session solidification storage module, and the PDU session application module and the PDU session solidification storage module correspondingly delete the stored PDU session information according to the ID information.
From the above description, the SMF network element verifies the PDU session information recovered after the UPF network element fails and restarts, so as to ensure the accuracy of the recovered PDU information, and at the same time, clean the PDU session information which is not verified in time, thereby further avoiding the abnormal PDU information from occupying the local storage space of the UPF network element.
Further, the PDU session application module in S4 reports the PDU session information to the SMF network element, specifically:
and the PDU session application module reports the main information in the PDU session information to the SMF network element, wherein the main information of the SMF network element comprises a PDU session ID and the IP address of the user equipment initiating the PDU session establishment request.
As can be seen from the above description, by comparing the PDU session ID of the SMF network element with the IP address of the user equipment, and comparing the PDU session ID of the PDU session information recovered by the UPF network element with the IP address of the user equipment interacting with the PDU session ID, the accuracy of determining whether the PDU session information is available is improved.
Referring to fig. 4, the computer program comprises a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor realizes the following steps when executing the computer program:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information;
and S3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way.
From the above description, the beneficial effects of the invention are as follows: based on the same technical conception, the PDU session information recovery method is matched with the PDU session information recovery method, the PDU session information transmitted by the SMF network element is solidified and stored through the UPF network element, when the UPF network element is restarted due to faults, the PDU session information solidified and stored through the UPF network element can be recovered locally, service is continuously provided for user equipment, the user equipment does not need to reestablish PDU session, and the processing pressure of the 5G core network is greatly reduced.
Further, the S2 specifically is:
s21, the PDU session management module of the UPF network element receives the PDU session information and analyzes the PDU session information;
s22, the PDU session management module sends the analyzed PDU session information to a PDU session application module and a PDU session solidification storage module respectively.
The above description shows that the UPF network element is divided into three functional modules, namely, a PDU session management module, a PDU session application module and a PDU session solidification storage module, which respectively analyze and distribute PDU session information, establish a data transmission channel between application PDU session information and user equipment, solidify and store PDU session information, and ensure that PDU session information is not lost from local storage due to restarting of the UPF network element.
Further, the step S3 specifically includes:
when the UPF network element fails, restarting the UPF network element, judging whether the UPF network element starts a PDU session self-recovery function or not by the PDU session management module, if so, automatically reading the PDU session information in the PDU session solidification storage module by the PDU session management module, and sending the PDU session information to the PDU session application module;
otherwise, the PDU session management module sends a session clearing request to the PDU session solidification storage module, and the PDU session solidification storage module deletes all the PDU session information stored in a solidification way.
As can be seen from the above description, when the failure of the UPF network element requires restarting, whether to start the PDU session self-recovery function is determined first, and then whether to recover the local PDU session information is determined according to the determination result, so as to improve the efficiency of information interaction with the user equipment, and at the same time, clean the PDU session information that does not need to be recovered in time to avoid occupying the local buffer.
Further, the step S3 further includes the steps of:
s4, the UPF network element reports the acquired PDU session information to the SMF network element, the SMF network element compares whether the PDU session information sent from the PDU session application module is consistent with the PDU session information stored by the UPF network element, if so, check success information is returned to the PDU session management module, and the PDU session information in the PDU session application module is successfully recovered;
if the PDU session information is inconsistent, returning verification failure information to the PDU session management module, wherein the verification failure information comprises the ID information of the abnormal PDU session information, the PDU session management module sends PDU session deletion information with the ID information to the PDU session application module and the PDU session solidification storage module, and the PDU session application module and the PDU session solidification storage module correspondingly delete the stored PDU session information according to the ID information.
From the above description, the SMF network element verifies the PDU session information recovered after the UPF network element fails and restarts, so as to ensure the accuracy of the recovered PDU information, and at the same time, clean the PDU session information which is not verified in time, thereby further avoiding the abnormal PDU information from occupying the local storage space of the UPF network element.
Further, the PDU session application module in S4 reports the PDU session information to the SMF network element, specifically:
and the PDU session application module reports the main information in the PDU session information to the SMF network element, wherein the main information of the SMF network element comprises a PDU session ID and the IP address of the user equipment initiating the PDU session establishment request.
As can be seen from the above description, by comparing the PDU session ID of the SMF network element with the IP address of the user equipment, and comparing the PDU session ID of the PDU session information recovered by the UPF network element with the IP address of the user equipment interacting with the PDU session ID, the accuracy of determining whether the PDU session information is available is improved.
The method and the terminal for recovering PDU session information are suitable for restarting a scene requiring reestablishing PDU session information to recover information interaction with user equipment after UPF network element failure in a 5G communication network, and are described below with reference to specific embodiments:
referring to fig. 1, a first embodiment of the present invention is as follows:
a method for recovering PDU session information, as shown in fig. 1, includes the steps of:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores PDU session information;
s3, when the UPF network element is restarted, the solidified and stored PDU session information is automatically acquired.
In this embodiment, the PDU session information sent by the SMF network element is solidified and stored by the UPF network element, and when the UPF network element fails and is restarted, the PDU session information solidified and stored by the UPF network element can be recovered locally, so that the service can be continuously provided for the user equipment, the user equipment does not need to reestablish the PDU session, and the processing pressure of the 5G core network is greatly reduced.
Referring to fig. 2 and 3, a second embodiment of the present invention is as follows:
in the first embodiment, the procedure of establishing, storing and recovering PDU session information is shown in fig. 2. Wherein the UPF network element side is divided into three functional modules: the device comprises a PDU session application module, a PDU session management module and a PDU session solidification storage module.
In this embodiment, step S2 specifically includes:
s21, a PDU session management module of the UPF network element receives PDU session information and analyzes the PDU session information;
s22, the PDU session management module sends the analyzed PDU session information to the PDU session application module and the PDU session solidification storage module respectively.
The PDU conversation management module is used for unified management of conversation information, including interaction with PDU conversation information of an SMF network element, distribution processing of PDU conversation information below the SMF network element received by a UPF network element, and the PDU conversation information is applied by the PDU application module, namely a data transmission channel is established with user equipment, service messages of the user equipment can be forwarded and processed according to the PDU conversation information in the PDU conversation application module, the PDU conversation information stored in the module is stored as memory, and the PDU conversation information of the module is lost after the UPF network element is restarted; the PDU session solidification storage module is specially used for carrying out solidification storage of local cache on PDU session information, and the PDU session information in the module is ensured not to be lost due to the restarting of UPF network element faults.
Therefore, as shown in fig. 2, when the SMF network element receives the PDU session establishment request initiated by the user equipment to generate PDU session information, the PDU session management module is sent to the UPF network element, and after analysis processing, the PDU session information is forwarded to the PDU session application module and the PDU session solidification storage module.
As shown in fig. 3, the flow of PDU session information self-recovery when the UPF network element fails and needs to be restarted is shown, where in this embodiment, step S3 specifically includes:
when the UPF network element fails, restarting the UPF network element, and judging whether the UPF network element starts a PDU session self-recovery function or not by a PDU session management module, if so, automatically reading PDU session information in a PDU session solidification storage module by the PDU session management module, and sending the PDU session information to a PDU session application module; otherwise, the PDU session management module sends a session clearing request to the PDU session solidification storage module, and the PDU session solidification storage module deletes all the PDU session information stored in a solidification way.
The method comprises the steps of judging whether to start a PDU session self-recovery function, and determining whether to recover local PDU session information according to a judging result so as to improve the efficiency of information interaction with user equipment, and cleaning PDU session information which does not need to be recovered in time before restarting a UPF network element so as to avoid occupying local buffer.
Meanwhile, as shown in fig. 3, if the UPF network element starts the PDU session self-recovery function, after the PDU session information self-recovery is completed, the recovered PDU session information needs to be uploaded to the SMF network element for verification, that is, after step S3, the method further includes the steps of:
s4, reporting the acquired PDU session information to the SMF network element by the UPF network element, comparing whether the PDU session information sent from the PDU session application module is consistent with the PDU session information stored by the UPF network element, and if so, returning a verification success information to the PDU session management module, wherein the PDU session information in the PDU session application module is successfully recovered;
if the PDU session information is inconsistent, returning verification failure information to the PDU session management module, wherein the verification failure information comprises the ID information of abnormal PDU session information, and the PDU session management module sends PDU session deletion information with the ID information to the PDU session application module and the PDU session solidification storage module, and correspondingly deletes the stored PDU session information according to the ID information.
The accuracy of the recovered PDU information is ensured through verification, meanwhile, the PDU session information which is stored in the UPF network element in a solidified way and fails to verify is cleaned in time, and the occupation of the local storage space of the UPF network element by the abnormal PDU information is further avoided.
In addition, in this embodiment, the step S4 of reporting the PDU session information to the SMF network element by the PDU session application module may specifically be that the PDU session application module reports main information in the PDU session information to the SMF network element, where the main information of the SMF network element includes a PDU session ID and an IP address of a user equipment that initiates a PDU session establishment request, that is, by using the PDU session ID and the IP address of the user equipment, accuracy of determining whether the PDU session information is available is improved.
Referring to fig. 4, a third embodiment of the present invention is as follows:
a recovery terminal 1 of PDU session information, comprising a memory 2, a processor 3 and a computer program stored on the memory 2 and executable on the processor 3, the processor 3 implementing the steps in a recovery method of PDU session information as in one of the above-described embodiments one or two when executing the computer program.
In summary, according to the method and the terminal for recovering PDU session information provided by the invention, three functional modules divided in the UPF network element respectively analyze and distribute PDU session information issued by the SMF network element, establish a data transmission channel with the user equipment to perform message forwarding processing and solidify and store the PDU session information into a local memory, and the method and the terminal are clear in labor division, when the UPF network element is restarted due to failure, the PDU session information solidified and stored by the UPF network element can be recovered locally, and the recovered PDU session information is reported to the SMF network element to be checked, so that the accuracy of the recovered PDU session information is ensured, service is continuously provided for the user equipment, and the user equipment does not need to reestablish the PDU session, thereby greatly reducing the processing pressure of the 5G core network.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (6)
1. A method for recovering PDU session information, comprising the steps of:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information, specifically:
s21, the PDU session management module of the UPF network element receives the PDU session information and analyzes the PDU session information;
s22, the PDU session management module respectively sends the analyzed PDU session information to a PDU session application module and a PDU session solidification storage module;
s3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way, wherein the PDU session information specifically comprises:
when the UPF network element fails, restarting the UPF network element, judging whether the UPF network element starts a PDU session self-recovery function or not by the PDU session management module, if so, automatically reading the PDU session information in the PDU session solidification storage module by the PDU session management module, and sending the PDU session information to the PDU session application module;
otherwise, the PDU session management module sends a session clearing request to the PDU session solidification storage module, and the PDU session solidification storage module deletes all the PDU session information stored in a solidification way.
2. The method for recovering PDU session information as recited in claim 1, wherein said step S3 further comprises the steps of:
s4, the UPF network element reports the acquired PDU session information to the SMF network element, the SMF network element compares whether the PDU session information sent from the PDU session application module is consistent with the PDU session information stored by the UPF network element, if so, check success information is returned to the PDU session management module, and the PDU session information in the PDU session application module is successfully recovered;
if the PDU session information is inconsistent, returning verification failure information to the PDU session management module, wherein the verification failure information comprises the ID information of the abnormal PDU session information, the PDU session management module sends PDU session deletion information with the ID information to the PDU session application module and the PDU session solidification storage module, and the PDU session application module and the PDU session solidification storage module correspondingly delete the stored PDU session information according to the ID information.
3. The method for recovering PDU session information according to claim 2, wherein the PDU session application module in S4 reports the PDU session information to the SMF network element, specifically:
and the PDU session application module reports the main information in the PDU session information to the SMF network element, wherein the main information of the SMF network element comprises a PDU session ID and the IP address of the user equipment initiating the PDU session establishment request.
4. A recovery terminal for PDU session information, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the following steps when executing said computer program:
s1, an SMF network element receives a PDU session establishment request initiated by user equipment, generates PDU session information and sends the PDU session information to a UPF network element;
s2, the UPF network element solidifies and stores the PDU session information, specifically:
s21, the PDU session management module of the UPF network element receives the PDU session information and analyzes the PDU session information;
s22, the PDU session management module respectively sends the analyzed PDU session information to a PDU session application module and a PDU session solidification storage module;
s3, when the UPF network element is restarted, automatically acquiring the PDU session information stored in a solidifying way, wherein the PDU session information specifically comprises:
when the UPF network element fails, restarting the UPF network element, judging whether the UPF network element starts a PDU session self-recovery function or not by the PDU session management module, if so, automatically reading the PDU session information in the PDU session solidification storage module by the PDU session management module, and sending the PDU session information to the PDU session application module;
otherwise, the PDU session management module sends a session clearing request to the PDU session solidification storage module, and the PDU session solidification storage module deletes all the PDU session information stored in a solidification way.
5. The PDU session information recovery terminal of claim 4, wherein said step S3 further comprises the steps of:
s4, the UPF network element reports the acquired PDU session information to the SMF network element, the SMF network element compares whether the PDU session information sent from the PDU session application module is consistent with the PDU session information stored by the UPF network element, if so, check success information is returned to the PDU session management module, and the PDU session information in the PDU session application module is successfully recovered;
if the PDU session information is inconsistent, returning verification failure information to the PDU session management module, wherein the verification failure information comprises the ID information of the abnormal PDU session information, the PDU session management module sends PDU session deletion information with the ID information to the PDU session application module and the PDU session solidification storage module, and the PDU session application module and the PDU session solidification storage module correspondingly delete the stored PDU session information according to the ID information.
6. The PDU session information recovery terminal of claim 5, wherein the PDU session application module in S4 reports the PDU session information to the SMF network element, specifically:
and the PDU session application module reports the main information in the PDU session information to the SMF network element, wherein the main information of the SMF network element comprises a PDU session ID and the IP address of the user equipment initiating the PDU session establishment request.
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| CN110199568A (en) * | 2017-03-18 | 2019-09-03 | 华为技术有限公司 | A connection recovery method, access and mobility management functional entity and user equipment |
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| CN110958718A (en) * | 2018-09-27 | 2020-04-03 | 中兴通讯股份有限公司 | PDU session reconstruction method, device, system and storage medium |
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