CN109429213B - Information processing method, device, equipment and computer readable storage medium - Google Patents

Abstract

The invention provides an information processing method, an information processing device, information processing equipment and a computer readable storage medium, relates to the technical field of communication and aims to save signaling resources. The information processing method of the present invention includes: when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of an MME (mobility management entity) in the process of initiating tracking area TAU (tracking area) update by the UE; storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by the EPS QoS mapping; sending the context of the UE to the MME. The invention can save signaling resources.

Description

Information processing method, device, equipment and computer readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an information processing method, an information processing apparatus, information processing equipment, and a computer-readable storage medium.

Background

With the development of communication technology, a 5G network needs to support interoperation with an LTE (Long Term Evolution) network. In an existing interoperation scheme for performing cross-System mobility for idle-state UEs (User equipments), firstly, when a PDU (Protocol Data Unit) session is established by a UE, a network is required to complete QoS (Quality of Service) flow (flow) of the PDU session and QoS mapping carried by an EPS (Evolved Packet System), and then, inter-System mobility is completed through a normal registration Update or TAU (Tracking Area Update) process. However, if the UE does not perform intersystem movement or deletes an established PDU session or QoS flow therein, the QoS mapping of the QoS flow and the EPS bearer performed in advance will be wasted, thereby causing a waste of signaling resources.

Disclosure of Invention

In view of the above, the present invention provides an information processing method, apparatus, device and computer readable storage medium to save signaling resources.

In order to solve the above technical problem, the present invention provides an information processing method applied to an Access and mobility Management Function (AMF), including:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of an Mobility Management Entity (MME) in the process of initiating Tracking Area (TAU) update by the UE;

storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending a context of the UE to the MME;

wherein, after the receiving of the context request of the mobility management entity MME, the method further comprises:

and determining the corresponding relation between the session management function entity of the PDU session of the UE and the DNN.

After the storing the correspondence between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE, the method further includes:

sending a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity according to the notification message; or

Directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or

And storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into subscription information in the UE context.

Wherein the method further comprises:

sending the EPS QoS parameters to the MME, wherein the EPS QoS parameters comprise parameter information configured to the UE.

Wherein the auxiliary information comprises: a mobility context of the UE; or

The auxiliary information includes: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or

The auxiliary information includes: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

In a second aspect, an embodiment of the present invention provides an information processing method, which is applied to an MME, and the method includes:

receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting a context of the UE from an AMF according to the TAU request;

receiving the context of the UE sent by the AMF, wherein the context of the UE comprises an EPS bearing context generated according to PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

and sending a TAU receiving message to the UE, wherein the TAU receiving message carries indication information, and the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes:

an EPS bearer context out of sync indication.

When the indication information is used for indicating information of PDN connection already established by the UE on the current network side, the indication information includes:

APN information for already established PDN connections.

In a third aspect, an embodiment of the present invention provides an information processing apparatus, including:

the system comprises a first receiving module, a second receiving module and a control module, wherein the first receiving module is used for receiving a context request of a mobility management entity MME in the process of initiating a tracking area TAU update by UE when idle-state user equipment UE moves from a 5G network to a long term evolution LTE network;

a processing module, configured to store, according to the context request, a correspondence between a session management function entity of the PDU session of the UE and a data network name DNN in subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

a first sending module, configured to send a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

Wherein the apparatus further comprises:

and the determining module is used for determining the corresponding relation between the session management function entity of the PDU session of the UE and the DNN.

Wherein the apparatus further comprises:

a second sending module, configured to send a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores, according to the notification message, a correspondence between a session management function entity of a PDU session of the UE and a DNN in a unified data management entity; or

The first storage module is used for directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or

And the second storage module is used for storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into the subscription information in the UE context.

Wherein the apparatus further comprises:

a third sending module, configured to send the EPS QoS parameter to the MME, where the EPS QoS parameter includes parameter information configured to the UE.

Wherein the auxiliary information comprises: a mobility context of the UE; or

The auxiliary information includes: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or

The auxiliary information includes: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

In a fourth aspect, an embodiment of the present invention provides an information processing apparatus, including:

the system comprises a first receiving module, a second receiving module and a sending module, wherein the first receiving module is used for receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

a request module, configured to request a context of the UE from an AMF according to the TAU request;

a second receiving module, configured to receive a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to PDU session context mapping of the UE;

the processing module is used for establishing PDN connection of the UE on a core network side of an LTE network according to the EPS bearing context of the UE;

a sending module, configured to send a TAU accept message to the UE, where the TAU accept message carries indication information, where the indication information is used to indicate the UE to reestablish a PDN connection corresponding to the PDU session, or the indication information is used to indicate information of a PDN connection that has been established on a current network side of the UE.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes:

an EPS bearer context out of sync indication.

When the indication information is used for indicating information of PDN connection already established by the UE on the current network side, the indication information includes:

APN information for already established PDN connections.

In a fifth aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; the processor implements the following steps when executing the program:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) through a transceiver in the process that the UE initiates Tracking Area (TAU) update;

storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending, by a transceiver, a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

In a sixth aspect, an embodiment of the present invention provides a computer-readable storage medium for storing a computer program, where the computer program is executable by a processor to implement the following steps:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) in the process of initiating Tracking Area (TAU) update by the UE;

storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

In a seventh aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, a transceiver, and a computer program stored in the memory and executable on the processor; the processor implements the following steps when executing the program:

receiving, by a transceiver, a TAU request of an idle-state UE when the UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting, by a transceiver, a context of the UE from an AMF according to the TAU request;

receiving, by a transceiver, a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

sending a TAU receiving message to the UE through a transceiver, wherein the TAU receiving message carries indication information, the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium for storing a computer program, where the computer program is executable by a processor to implement the following steps:

receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting a context of the UE from an AMF according to the TAU request;

receiving the context of the UE sent by the AMF, wherein the context of the UE comprises an EPS bearing context generated according to PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

and sending a TAU receiving message to the UE, wherein the TAU receiving message carries indication information, and the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

The technical scheme of the invention has the following beneficial effects:

in the embodiment of the invention, when idle-state User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, in the process of initiating tracking area TAU update by the UE, an AMF (advanced metering function) stores the corresponding relation between a session management function entity and a Data Network Name (DNN) of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, returning EPS QoS parameters generated by EPS QoS mapping, sending the context of the UE to an MME, and including auxiliary information for establishing PDN connection of a packet data network in the context request, so that the MME establishes PDN connection for the UE according to the auxiliary information. Therefore, the scheme of the embodiment of the invention avoids unnecessary QoS mapping process in the 5G network, thereby saving signaling resources.

Drawings

FIG. 1 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 2 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 3 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 4 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 5 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 6 is a flow chart of an information processing method according to an embodiment of the present invention;

FIG. 7 is a diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 8 is a diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 11 is a diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 12 is a diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 14 is a schematic view of an electronic device according to an embodiment of the invention;

fig. 15 is a schematic diagram of an electronic device according to an embodiment of the invention.

Detailed Description

The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1, an information processing method according to an embodiment of the present invention is applied to an AMF, and the method includes:

step 101, when the idle UE moves from the 5G network to the LTE network, in a process of initiating TAU update by the UE, receiving a context request of the MME.

The context request of the MME is sent by the MME when the MME receives a TAU (Tracking Area Update) request of the UE, where the TAU request message does not carry EPS bearer information.

In the context request, mapped GUTI (global unique temporary UE Identity) of the UE may be included.

Step 102, storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, and returning EPS QoS parameters generated by EPS QoS mapping.

Step 103, sending the context of the UE to the MME.

In this step, the AMF may obtain a corresponding context according to the temporary identity of the UE. And the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

In an embodiment of the present invention, the auxiliary information includes: a mobility context of the UE; or the auxiliary information comprises: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or the auxiliary information comprises: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

In the embodiment of the invention, when idle-state User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, in the process of initiating tracking area TAU update by the UE, an AMF (advanced metering function) stores the corresponding relation between a session management function entity and a Data Network Name (DNN) of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, returning EPS QoS parameters generated by EPS QoS mapping, sending the context of the UE to an MME, and including auxiliary information for establishing PDN connection of a packet data network in the context request, so that the MME establishes PDN connection for the UE according to the auxiliary information. Therefore, the scheme of the embodiment of the invention avoids unnecessary QoS mapping process in the 5G network, thereby saving signaling resources.

On the basis of the embodiment shown in fig. 1, the method may further include:

the AMF determines a correspondence between identification information of an SMF (Session Management Function) and a DNN (Data Network Name) corresponding to a PDU Session of the UE.

On the basis of the embodiment shown in fig. 1, the method may further include:

the AMF may send a notification message to a session Management function entity serving the UE according to a correspondence between the PDU session and the session Management function entity stored in the context of the UE, so that the session Management function entity serving the UE stores the correspondence between the session Management function entity of the PDU session and the DNN of the UE in a Unified Data Management entity (UDM) according to the notification message; or the AMF can also directly store the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or the AMF may further store the correspondence between the session management function entity of the PDU session of the UE and the DNN in the subscription information in the UE context.

Before determining to store the corresponding relationship between the identification information of the session management function entity corresponding to the PDU session and the DNN to the unified data management entity, the AMF or the PGW-C + SMF may further determine that the PDU session requires service continuity, for example, requires the IP address to be reserved or unchanged.

On the basis of the embodiment shown in fig. 1, the method may further include:

and the AMF sends the EPS QoS parameters of the UE to the MME, wherein the EPS QoS parameters comprise parameter information configured to the UE.

As shown in fig. 2, an information processing method according to an embodiment of the present invention is applied to an MME, and the method includes:

step 201, when an idle-state UE moves from a 5G network to a long term evolution LTE network, receiving a TAU request of the UE.

Step 202, requesting context of the UE from AMF according to the TAU request.

Step 203, receiving the context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to the PDU session context mapping of the UE.

And step 204, establishing the PDN connection of the UE on the core network side of the LTE network according to the EPS bearing context of the UE.

Step 205, sending a TAU accept message to the UE, where the TAU accept message carries indication information, where the indication information is used to indicate the UE to reestablish a PDN connection corresponding to the PDU session, or the indication information is used to indicate information of a PDN connection already established on the current network side of the UE.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes: an EPS bearer context out of sync indication. When the indication information is used for indicating information of PDN connection already established by the current network side of the UE, the indication information includes: APN information for already established PDN connections.

In the embodiment of the invention, when idle-state User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, in the process of initiating tracking area TAU update by the UE, an AMF (advanced metering function) stores the corresponding relation between a session management function entity and a Data Network Name (DNN) of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, returning EPS QoS parameters generated by EPS QoS mapping, sending the context of the UE to an MME, and including auxiliary information for establishing PDN connection of a packet data network in the context request, so that the MME establishes PDN connection for the UE according to the auxiliary information. Therefore, the scheme of the embodiment of the invention avoids unnecessary QoS mapping process in the 5G network, thereby saving signaling resources.

As shown in fig. 3, the information processing method according to the embodiment of the present invention includes:

step 301, the idle UE moves from the 5G network to the LTE network, and initiates a TAU (Tracking Area Update) process. Sending a TAU Request message to the MME, where the message carries mapped GUTI (global Unique Temporary UE Identity) (mapped from 5G GUTI) without any EPS (Evolved Packet System) carried information, such as epsbearrer status (EPS bearer state).

In the embodiment of the present invention, the TAU Request message may further carry a special indication, so as to facilitate the MME to distinguish and process the Request (the MME may also determine that the message is a special TAU Request according to a mapped GUTI).

Step 302, after receiving the TAU Request, the MME finds the AMF according to the mapped GUTI, and then sends a Context Request to the AMF.

Step 303, after receiving the Context Request, the AMF determines the Context of the UE according to the temporary identifier of the UE, and then stores the information of the DNN (digital Data network) and the PGW-C + SMF in the HSS (Home Subscriber Server) and the UDM (Unified Data Management) according to the Context of the UE.

Here, the AMF may send a message (N11Notify request, N11 notification request) of the N11 interface to a PGW-C (control plane PDN gateway) + SMF (Session Management Function) of all the serving UEs according to a correspondence between a PDU Session and an SMF ID stored in the UE Context, send a Notify request (notification request) to an HSS + UDM by a PGW-C + SMF of the serving UE, Notify the PGW-C + SMF to store a correspondence between a PGW-C + SMF address and a DNN of each PDU Session in the HSS + UDM. Or the AMF can also directly store the corresponding relation between the PGW-C + SMF address and the DNN of each PDU session into the HSS + UDM. Wherein, the PDU session has a continuity mode of 1. In the embodiment of the present invention, fig. 3 shows a process in which the AMF stores the PGW-C + SMF address and the corresponding DNN of each PDU session in the HSS + UDM through the PGW-C + SMF.

Step 304, PGW-C + SMF saves its address and corresponding DNN to HSS + UDM.

Step 305, the AMF sends a Context response message (Context response) to the MME, and returns a Context of the UE, where the Context only includes the MM Context and does not include the Context of the PDN session.

In step 306, after receiving the Context, the MME sends a Context acknowledgement (Context ACK) to the AMF.

Step 307, the MME sends an Update location request message to the HSS + UDM, requesting to Update the location information.

Step 308-step 309, the HSS + UDM sends a cancel location request message to the AMF, requesting the AMF to delete the UE related information. After deleting the relevant information of the UE, the AMF returns a cancel location ACK (cancel location acknowledgement) message to the HSS + UDM.

Step 310, the HSS + UDM returns an Update location acknowledgement (Update location ACK) message to the MME, where the message carries subscription information of the UE, where the subscription information includes a correspondence between an APN (Access Point Name) (DNN) and a PGW-C + SMF address.

Step 311, the MME returns a TAU Accept message to the UE.

Step 312, when the UE wishes to initiate a service, first send a PDN connectivity Request message to the MME, where the message carries a Handover flag and an APN.

Step 313, after receiving the handover flag, the MME acquires a PGW address corresponding to the APN from the subscription Data, and then establishes a PDN connection (PDN (Packet Data Network) connection) according to the prior art.

And step 314, the UE establishes other PDN connections corresponding to the PDU session of the 5G system.

As shown in fig. 4, the information processing method according to the embodiment of the present invention includes:

step 401, the idle UE moves from the 5G network to the LTE network, and initiates a TAU procedure, where a TAU Request message carries a mapped GUTI (mapped from the 5G GUTI) without any EPS bearer information, such as epsbearrer status.

Step 402, after receiving the TAU Request, the MME finds the AMF according to the mapped GUTI, and then sends a Context Request to the AMF.

Step 403, after receiving the Context Request, the AMF determines DNN and PGW-C + SMF used by each PDU session according to the correspondence between PDUs and SMF IDs stored in the UE Context, then returns the correspondence between DNN and PGW-C + SMF to the MME through a Context Response message, and sends the MM Context of the UE to the MME.

In step 404, the MME sends a Context acknowledgement (Context ACK) to the AMF after receiving the Context of the UE.

Step 405, the MME saves the received correspondence between dnn (apn) and PGW-C + SMF in the PDNconnection Context of the UE, and makes a special mark, for example, as a temporary Context; or the correspondence between dnn (apn) and PGW-C + SMF is stored in the subscription data, for example as a temporary subscription.

Step 406, the MME returns a TAU Accept message to the UE.

Step 407, when the UE wishes to initiate a service, first send a PDN connectivity Request message to the MME, where the message carries an APN and may also carry a handover flag.

Step 408, because the MME stores APN and PGW information in the PDN connection Context of the UE, according to the prior art, the MME needs to select the same PGW to establish the PDN connection for the UE; or if the DNN and the corresponding PGW-C + SMF are stored in the subscription data by the MME, establishing PDN connection by using the PGW-C + SMF stored in the subscription data according to the handover flag.

Step 409, the UE establishes other PDN connections corresponding to the PDU session of the 5G system.

As shown in fig. 5, the information processing method according to the embodiment of the present invention includes:

step 501, the idle UE moves from the 5G network to the LTE network, and initiates a TAU procedure, where a TAU Request message carries mapped GUTI (mapped from the 5G GUTI) without any EPS bearer information, such as epsbearrer status.

Step 502, after receiving the TAU Request, the MME finds the AMF according to the mapped GUTI, and then sends a Context Request to the AMF.

Step 503, after receiving the Context Request, the AMF sends an SMContext Request (session management Context Request) message of the N11 interface to the PGW-C + SMF of all the serving UEs according to the correspondence between the PDU session stored in the UE Context and the SMF ID, and requests the PGW-C + SMF to perform EPS QoS mapping. Correspondingly, PGW-C + SMF performs EPS QoS mapping.

Step 504, the PGW-C + SMF sends an SM Context Response message to the AMF, returns an EPS bearer Context (EPS bearer Context) generated by mapping to the AMF, and sends the generated mapped EPS (mapped EPS) information sent to the UE to the AMF.

Step 505, the AMF generates PDN connectivity Context (PDN connection Context) of the UE according to the EPS bearer Context received from each SMF, and sends the PDN connectivity Context to the MME.

Meanwhile, the AMF also receives the EPS QoS parameters of the UE sent by the SMFs and sends the EPS QoS parameters of the UE to an MME. Specifically, the AMF generates mapped EPS Context (mapped EPS Context) information configured for the UE according to the mapped EPS information sent to the UE received from each SMF, and encapsulates the configuration information in a container. Meanwhile, the upper Context transmitted to the UE only contains MM Context.

In step 506, the MME sends a Context acknowledgement (Context ACK) to the AMF after receiving the Context of the UE.

Step 507, the MME establishes each PDN connection in the core network according to the PDN connection Context in the received UE Context and according to the prior art.

Step 508, the MME sends mappedEPS Context information configured to the UE in the container to the UE through a TAU Accept message, where the message carries an updated EPS bearer status.

After receiving the mapped EPS Context information configured for the UE, the UE performs Context update and performs synchronization of the EPSquarer status (EPS bearing state).

As shown in fig. 6, the information processing method according to the embodiment of the present invention includes:

step 601, the idle UE moves from the 5G network to the LTE network, and initiates a TAU procedure, where a TAU Request message carries mapped GUTI (mapped from the 5G GUTI) without any EPS bearer information, such as epsbearrer status. The MME determines that the TAU procedure is due to inter-system movement, e.g., according to mapped GUTI, that the message is a special TAU procedure.

Step 602, after receiving the Request, the MME finds the AMF according to the mapped GUTI, and then sends a Context Request to the AMF.

Step 603, after receiving the Request, the AMF sends an SM Context Request (SM Context Request) message of an N11 interface to the PGW-C + SMF of all the serving UEs according to the correspondence between the PDU session stored in the UE Context and the SMF ID, requests the PGW-C + SMF to perform EPS QOS mapping, and returns an EPS bearer Context (EPS bearer Context) generated by mapping through an SM Context Response (SM Context Response).

Step 604, the AMF returns a Context of the UE to the MME through a Context Response, where the Context includes an EPS bearer Context (Context ACK) generated by mapping.

Step 605, after receiving the Context, the MME sends a Context acknowledgement to the AMF.

And step 606-609, the MME establishes PDN connection on the core network side according to the prior art according to the received EPS bearer Context.

Step 610, the MME returns a TAU Accept message to the UE, where the message carries the indication information. The indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session; or, the indication information is used to indicate information of PDN connection already established by the UE on the current network side.

If the indication information is used for indicating the UE to reestablish the PDN connection corresponding to the PDU session, the indication information comprises: an EPS bearer context out of sync indication. If the indication information is used for indicating the information of the PDN connection established by the current network side of the UE, the indication information comprises: APN information for already established PDN connections.

Step 611, the UE sends a PDN connectivity Request message to the MME, requesting to establish a PDN connection.

Step 612, the MME judges whether the PDN connection to the APN has been established in the core network according to the APN carried in the message and the Context of the PDN connection of the UE, and if so, reuses the Context of the existing PDN connection to complete the establishment of the PDN connection, otherwise establishes the PDN connection according to the existing procedure.

Step 613, the UE establishes other PDNconnection corresponding to the PDU session of the 5G system through the same steps.

As shown in fig. 7, an information processing apparatus according to an embodiment of the present invention includes:

a first receiving module 701, configured to receive a context request of a mobility management entity MME in a process of initiating a tracking area TAU update by a UE when an idle-state user equipment UE moves from a 5G network to a long term evolution LTE network; a processing module 702, configured to store, according to the context request, a correspondence between a session management function entity and a data network name DNN of the PDU session of the UE in subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping; a first sending module 703, configured to send a context of the UE to the MME; and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

As shown in fig. 8, in one embodiment of the present invention, the apparatus further comprises:

a determining module 704, configured to determine a correspondence between a session management function entity and a DNN of the PDU session of the UE.

As shown in fig. 9, in one embodiment of the present invention, the apparatus further comprises: a second sending module 705, configured to send a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores, according to the notification message, a correspondence between a session management function entity of a PDU session of the UE and a DNN in a unified data management entity; alternatively, as shown in fig. 10, in an embodiment of the present invention, the apparatus further includes: a first storage module 706, configured to directly store a correspondence between a session management function entity and a DNN of a PDU session of the UE in a unified data management entity; alternatively, as shown in fig. 11, in an embodiment of the present invention, the apparatus further includes: a second storage module 707, configured to store a correspondence between a session management function entity of the PDU session of the UE and the DNN in subscription information in the context of the UE.

As shown in fig. 12, in one embodiment of the present invention, the apparatus further comprises:

a third sending module 708, configured to send, to the MME, the EPS QoS parameter of the UE, where the EPS QoS parameter includes parameter information configured to the UE.

In an embodiment of the present invention, the auxiliary information includes: a mobility context of the UE; or the auxiliary information comprises: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or the auxiliary information comprises: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

The working principle of the device according to the invention can be referred to the description of the method embodiment described above.

In the embodiment of the invention, when idle-state User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, in the process of initiating tracking area TAU update by the UE, an AMF (advanced metering function) stores the corresponding relation between a session management function entity and a Data Network Name (DNN) of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, returning EPS QoS parameters generated by EPS QoS mapping, sending the context of the UE to an MME, and including auxiliary information for establishing PDN connection of a packet data network in the context request, so that the MME establishes PDN connection for the UE according to the auxiliary information. Therefore, the scheme of the embodiment of the invention avoids unnecessary QoS mapping process in the 5G network, thereby saving signaling resources.

As shown in fig. 13, the information processing apparatus of the embodiment of the present invention includes:

a first receiving module 801, configured to receive a TAU request of a UE when the idle UE moves from a 5G network to a long term evolution LTE network; a requesting module 802, configured to request a context of the UE from an AMF according to the TAU request; a second receiving module 803, configured to receive a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to a PDU session context mapping of the UE; a processing module 804, configured to establish a PDN connection of the UE on a core network side of an LTE network according to the EPS bearer context of the UE; a sending module 805, configured to send a TAU accept message to the UE, where the TAU accept message carries indication information, where the indication information is used to indicate the UE to reestablish a PDN connection corresponding to the PDU session, or the indication information is used to indicate information of a PDN connection already established on a current network side of the UE.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes: an EPS bearer context out of sync indication.

When the indication information is used for indicating information of PDN connection already established by the UE on the current network side, the indication information includes: APN information for already established PDN connections.

In the embodiment of the invention, when idle-state User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, in the process of initiating tracking area TAU update by the UE, an AMF (advanced metering function) stores the corresponding relation between a session management function entity and a Data Network Name (DNN) of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session, returning EPS QoS parameters generated by EPS QoS mapping, sending the context of the UE to an MME, and including auxiliary information for establishing PDN connection of a packet data network in the context request, so that the MME establishes PDN connection for the UE according to the auxiliary information. Therefore, the scheme of the embodiment of the invention avoids unnecessary QoS mapping process in the 5G network, thereby saving signaling resources.

As shown in fig. 14, the electronic device according to the embodiment of the present invention includes: the processor 1100, which reads the program in the memory 1120, performs the following processes:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) through a transceiver 1111 in the process of initiating a Tracking Area (TAU) update by the UE; storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping; sending, by the transceiver 1111, the context of the UE to the MME; and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

A transceiver 1111 for receiving and transmitting data under the control of the processor 1100.

Where in fig. 14, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1100, and various circuits, represented by memory 1120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1111 may be a plurality of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

Processor 1100 is further configured to determine a correspondence between a session management function entity and a DNN of the PDU session of the UE.

The processor 1100 is further configured to send a notification message to the session management function entity serving the UE, so that the session management function entity serving the UE stores the correspondence between the session management function entity of the PDU session of the UE and the DNN in the unified data management entity according to the notification message; or directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into subscription information in the UE context.

Processor 1100 is also configured to send, via transceiver 1111, the EPS QoS parameters to the MME, wherein the EPS QoS parameters include parameter information configured to the UE.

Wherein the auxiliary information comprises: a mobility context of the UE; or the auxiliary information comprises: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or the auxiliary information comprises: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

Furthermore, a computer-readable storage medium of an embodiment of the present invention stores a computer program executable by a processor to implement:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) in the process of initiating Tracking Area (TAU) update by the UE;

storing the corresponding relation between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE according to the context request; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

Wherein, after the receiving of the context request of the mobility management entity MME, the method further comprises:

and determining the corresponding relation between the session management function entity of the PDU session of the UE and the DNN.

After the storing the correspondence between the session management function entity of the PDU session of the UE and the data network name DNN into the subscription data of the UE, the method further includes:

sending a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity according to the notification message; or

Directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or

And storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into subscription information in the UE context.

Wherein the method further comprises:

sending the EPS QoS parameters to the MME, wherein the EPS QoS parameters comprise parameter information configured to the UE.

Wherein the auxiliary information comprises: a mobility context of the UE; or the auxiliary information comprises: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or the auxiliary information comprises: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

As shown in fig. 15, the electronic device according to the embodiment of the present invention includes: a processor 1300, for reading the program in the memory 1320, for executing the following processes:

receiving, by a transceiver 1311, a TAU request of an idle-state UE when the UE moves from a 5G network to a long term evolution, LTE, network;

requesting, by the transceiver 1311, a context of the UE from an AMF according to the TAU request;

receiving, by a transceiver 1311, a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

sending a TAU accept message to the UE through a transceiver 1311, where the TAU accept message carries indication information, where the indication information is used to indicate the UE to reestablish a PDN connection corresponding to the PDU session, or the indication information is used to indicate information of a PDN connection already established on the current network side of the UE.

A transceiver 1311 for receiving and transmitting data under the control of the processor 1300.

In fig. 15, among other things, the bus architecture may include any number of interconnected buses and bridges with various circuits being linked together, particularly one or more processors represented by processor 1300 and memory represented by memory 1320. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1311 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1300 in performing operations.

The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1300 in performing operations.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes:

an EPS bearer context out of sync indication.

When the indication information is used for indicating information of PDN connection already established by the UE on the current network side, the indication information includes:

APN information for already established PDN connections.

Furthermore, a computer-readable storage medium of an embodiment of the present invention stores a computer program executable by a processor to implement:

receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting a context of the UE from an AMF according to the TAU request;

receiving the context of the UE sent by the AMF, wherein the context of the UE comprises an EPS bearing context generated according to PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

and sending a TAU receiving message to the UE, wherein the TAU receiving message carries indication information, and the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

Wherein, the TAU request of the UE does not carry any EPS bearer information.

Wherein, when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes:

an EPS bearer context out of sync indication.

When the indication information is used for indicating information of PDN connection already established by the UE on the current network side, the indication information includes:

APN information for already established PDN connections.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (22)

1. An information processing method, applied to an access and mobility management function (AMF), the method comprising:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) in the process of initiating Tracking Area (TAU) update by the UE;

according to the context request, storing the corresponding relation between a session management function entity and a data network name DNN of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

2. The method of claim 1, wherein after the receiving the context request of the Mobility Management Entity (MME), the method further comprises:

and determining the corresponding relation between the session management function entity of the PDU session of the UE and the DNN.

3. The method of claim 1, wherein after saving the correspondence between the session management function entity and the Data Network Name (DNN) for the PDU session of the UE into subscription data of the UE, the method further comprises:

sending a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity according to the notification message; or

Directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or

And storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into subscription information in the UE context.

4. The method of claim 1, further comprising:

sending the EPS QoS parameters to the MME, wherein the EPS QoS parameters comprise parameter information configured to the UE.

5. The method of claim 1,

the auxiliary information includes: a mobility context of the UE; or

The auxiliary information includes: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or

The auxiliary information includes: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

6. An information processing method applied to an MME, the method comprising:

receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting a context of the UE from an AMF according to the TAU request;

receiving a context of the UE sent by the AMF, wherein the context of the UE comprises an EPS bearing context generated according to a Protocol Data Unit (PDU) session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

and sending a TAU receiving message to the UE, wherein the TAU receiving message carries indication information, and the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

7. The method of claim 6, wherein the TAU request of the UE does not carry any EPS bearer information.

8. The method of claim 6, wherein when the indication information is used to instruct the UE to reestablish the PDN connection corresponding to the PDU session, the indication information comprises:

an EPS bearer context out of sync indication.

9. The method according to claim 6, wherein when the indication information is used for indicating information of PDN connections already established by the UE on the current network side, the indication information includes:

access node name APN information for already established PDN connections.

10. An information processing apparatus characterized by comprising:

the system comprises a first receiving module, a second receiving module and a control module, wherein the first receiving module is used for receiving a context request of a mobility management entity MME in the process of initiating a tracking area TAU update by UE when idle-state user equipment UE moves from a 5G network to a long term evolution LTE network;

a processing module, configured to store, according to the context request, a correspondence between a session management function entity of a protocol data unit PDU session of the UE and a data network name DNN in subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning an EPSQoS parameter generated by EPS QoS mapping;

a first sending module, configured to send a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

11. The apparatus of claim 10, further comprising:

and the determining module is used for determining the corresponding relation between the session management function entity of the PDU session of the UE and the DNN.

12. The apparatus of claim 10, further comprising:

a second sending module, configured to send a notification message to a session management function entity serving the UE, so that the session management function entity serving the UE stores, according to the notification message, a correspondence between a session management function entity of a PDU session of the UE and a DNN in a unified data management entity; or

The first storage module is used for directly storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into a unified data management entity; or

And the second storage module is used for storing the corresponding relation between the session management function entity of the PDU session of the UE and the DNN into the subscription information in the UE context.

13. The apparatus of claim 10, further comprising:

a third sending module, configured to send the EPS QoS parameter to the MME, where the EPS QoS parameter includes parameter information configured to the UE.

14. The apparatus of claim 10,

the auxiliary information includes: a mobility context of the UE; or

The auxiliary information includes: the corresponding relation among the mobility context of the UE, the session management functional entity of the PDU session of the UE and the DNN; or

The auxiliary information includes: and the mobility context of the UE and the EPS bearing context generated by the mapping of the session management functional entity.

15. An information processing apparatus characterized by comprising:

the system comprises a first receiving module, a second receiving module and a sending module, wherein the first receiving module is used for receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

a request module, configured to request a context of the UE from an AMF according to the TAU request;

a second receiving module, configured to receive a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to a protocol data unit PDU session context mapping of the UE;

the processing module is used for establishing PDN connection of the UE on a core network side of an LTE network according to the EPS bearing context of the UE;

a sending module, configured to send a TAU accept message to the UE, where the TAU accept message carries indication information, where the indication information is used to indicate the UE to reestablish a PDN connection corresponding to the PDU session, or the indication information is used to indicate information of a PDN connection that has been established on a current network side of the UE.

16. The apparatus of claim 15, wherein the TAU request of the UE does not carry any EPS bearer information.

17. The apparatus of claim 15,

when the indication information is used to indicate the UE to reestablish the PDN connection corresponding to the PDU session, the indication information includes:

an EPS bearer context out of sync indication.

18. The apparatus of claim 15,

when the indication information is used for indicating information of PDN connection already established by the current network side of the UE, the indication information includes:

access node name APN information for already established PDN connections.

19. An electronic device comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) through a transceiver in the process that the UE initiates Tracking Area (TAU) update;

according to the context request, storing the corresponding relation between a session management function entity and a data network name DNN of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending, by a transceiver, a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

20. A computer-readable storage medium storing a computer program executable by a processor to perform the steps of:

when idle User Equipment (UE) moves from a 5G network to a Long Term Evolution (LTE) network, receiving a context request of a Mobility Management Entity (MME) in the process of initiating Tracking Area (TAU) update by the UE;

according to the context request, storing the corresponding relation between a session management function entity and a data network name DNN of a Protocol Data Unit (PDU) session of the UE into subscription data of the UE; or requesting the session management functional entity to perform EPS QoS mapping according to the context of the PDU session and returning EPS QoS parameters generated by EPS QoS mapping;

sending a context of the UE to the MME;

and the context comprises auxiliary information used for establishing PDN connection of the packet data network, so that the MME establishes the PDN connection for the UE according to the auxiliary information.

21. An electronic device comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

receiving, by a transceiver, a TAU request of an idle-state UE when the UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting, by a transceiver, a context of the UE from an AMF according to the TAU request;

receiving, by a transceiver, a context of the UE sent by the AMF, where the context of the UE includes an EPS bearer context generated according to a protocol data unit PDU session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

sending a TAU receiving message to the UE through a transceiver, wherein the TAU receiving message carries indication information, the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

22. A computer-readable storage medium storing a computer program executable by a processor to perform the steps of:

receiving a TAU request of the UE when the idle-state UE moves from a 5G network to a Long Term Evolution (LTE) network;

requesting a context of the UE from an AMF according to the TAU request;

receiving a context of the UE sent by the AMF, wherein the context of the UE comprises an EPS bearing context generated according to a Protocol Data Unit (PDU) session context mapping of the UE;

establishing PDN connection of the UE at a core network side of an LTE network according to the EPS bearing context of the UE;

and sending a TAU receiving message to the UE, wherein the TAU receiving message carries indication information, and the indication information is used for indicating the UE to reestablish PDN connection corresponding to the PDU session, or the indication information is used for indicating the information of PDN connection established by the current network side of the UE.

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