WO2018145671A1

WO2018145671A1 - Cross-system handover method and device, and computer storage medium

Info

Publication number: WO2018145671A1
Application number: PCT/CN2018/082149
Authority: WO
Inventors: 李振东; 朱进国; 梁爽; 周晓云
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-02-07
Filing date: 2018-04-08
Publication date: 2018-08-16
Also published as: CN108401269A

Abstract

Provided in the embodiments of the present invention are a method and a device for cross-system handover, the method comprising: a first access and mobility management function (AMF) learns that a UE has undergone cross-system handover, said cross-system handover being from a 5G system to a 4G system, and said first AMF being within the 5G system; during the process of handover from a 5G system to a 4G system, the first AMF sends pre-stored target carrier information of the UE to a mobility management node function (MME), said MME, which is within the 4G system, being used for reserving resources for the UE on the radio side according to the received target carrier information. The embodiments of the present invention also provide a computer storage medium.

Description

Cross-system switching method and device, computer storage medium

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for switching between systems, and a computer storage medium.

Background technique

The 3GPP (3rd Generation Partnership Project) has developed a fourth-generation (or LTE, Long Term Evolution, long-term evolution) mobile communication system from R8. Its network architecture is shown in Figure 1. The functions of each network element in the architecture are as follows:

The terminal is also called User Equipment (UE): accessing the 4G network through the wireless air interface and obtaining services. The terminal exchanges information through the air interface and the eNB base station, and passes through the non-access stratum signaling NAS (non-Access Stratum) and the core. The mobility management entity of the network interacts with the information.

The base station (e.g., the evolved base station RAN, radio access network, eNB) of the radio access network is responsible for the air interface resource scheduling of the terminal accessing the network and the connection management of the air interface.

Mobile management entity: The core network control plane entity is mainly responsible for user authentication, authorization, and subscription checking, user mobility management, public data network (PDN) connection, and bearer maintenance. Triggering is triggered in the user IDLE state. Call and other functions.

Serving Gateway (S-GW): The functional entity of the core network user plane, which is mainly responsible for the interaction with the PDN GW in the case of roaming.

PDN Gateway (P-GW): The core network user plane function entity is the access point of the terminal accessing the PDN network. It is responsible for allocating user IP addresses, network triggered bearer establishment, modification and deletion, and QoS control. The functions such as billing are the anchor points of the user in the 3GPP system, so as to ensure the IP address unchanged and ensure business continuity. In the control and forwarding separation architecture, the P-GW is further divided into two parts, one is the control entity PGW-C, and the other is the user plane entity PGW-U. PGW-C is responsible for signaling control, and PGW-U is responsible for IP forwarding.

Home Subscribed Server (HSS): Stores the user's subscription information.

Policy and charging control function (PCRF), responsible for policy decision making and charging rules. The PCRF provides network control rules based on service data flows, including traffic data flow detection, Gating Control, Quality of Service (QoS) control, and data flow based charging rules. The PCRF sends its formulated policies and charging rules to the P-GW for execution.

3GPP began researching the Next Generation System from the standard R14. The next-generation communication system can support eMBB (Evolved Mobile Broadband), mMTC (Massive Machine Type Communication), uMTC (Ultra). Reliable Machine Type Communication, three types of services, which have different network characteristics. 2 is a schematic diagram of a next-generation mobile communication network architecture, in which the functions of each network element are as follows:

The terminal (UE, User Equipment) accesses the network through the next-generation wireless air interface and obtains the service. The terminal exchanges information through the air interface and the base station, and interacts with the common control plane function of the core network and the session control plane through the non-access layer signaling. information.

The next-generation base station (NG RAN, Radio Access Network, gNB), that is, the NR base station, is responsible for the air interface resource scheduling of the terminal access network and the connection management of the air interface.

Session Management Function (SMF): This is the session management function, which interacts with the terminal. It is mainly responsible for handling the establishment, modification, and deletion of User Protocol Data Unit (PDU) sessions. Selecting the User Plane function (UPF) User plane function); establish user plane connection between the UE and the UPF; and determine the quality of service (QoS) parameters of the session together with the Policy Control Function (PCF).

Access and Mobility Control Function (AMF): The access and mobility management functions are common control plane functions in the core network. A user has only one AMF, which is responsible for authentication, authorization, and subscription checking of users to ensure that users are legitimate users; user mobility management, including location registration and temporary identity allocation; when users initiate PDUs (Packet Data Units) When the connection establishment request is made, the appropriate SMF is selected; the non-access stratum (NAS, Non Access Stratum) signaling between the UE and the SMF is forwarded; and the access stratum AS (Access Stratum) signaling between the base station and the SMF is forwarded. . The NAS message is sent and received between the UE and the AMCF through the N1 interface. The AMCF interacts with the next-generation base station NG RAN through the N2 interface.

User Plane Function (UPF): Provides user plane processing functions, including data forwarding and QoS execution. UPF also provides user plane anchors when users move to ensure business continuity. The user plane function UPF and the generation base station NG RAN send and receive the media plane data of the UE through the N3 interface. The SMF controls the UPF through the N4 interface.

Policy Control Function (PCF): Provides the user with the QoS rule (Quality of Service Related Rules) provided to the SMF.

Subscription Data Management (SDM): stores the user's subscription data, which is similar to the HSS in the 4G era.

The deployment of NextGen System (5G) will begin to be deployed locally in hotspots such as downtown, business centers and more. When the UE accesses the 5G system, as the user moves, the coverage of the 5G system is removed, and it is necessary to solve how to seamlessly switch to the 4G system, otherwise the session will be interrupted.

Figure 3 is a network architecture that satisfies 4G and 5G bidirectional switching. The core feature is that the architecture is compatible with both 4G and 5G architectures. PGW-C and SMF are combined into one. PGW-U and UPF are combined into one. PCF and PCRF are combined into one. The user plane of UE is always anchored in UPF. /PGW-U. Between the AMF and the MME, an Nx interface is added, and an inter-system handover request is sent on the interface. In this way, when the UE switches between LTE and 5G, seamless handover can be guaranteed.

In a 4G system, the UE and the network use bearers (bearer concepts), each bearer represents a corresponding service flows, and its QoS parameters. In the 5G system, the concept of QoS flow is adopted, and each QoS flow includes a corresponding QoS profile (ie, OoS configuration) and a packet filter.

In the application process of the network, if the user equipment moves to a location where the 5G coverage is not ideal or there is no 5G network coverage, the process of the user equipment switching from the 5G system to the 4G system occurs. It has been found that after the user equipment switches from 5G to 4G, the user equipment needs to be allocated a communication delay to be allocated resources for communication, so that data transmission can be realized, thereby causing the user equipment to switch from 5G to 4G. The delay is large and the data transmission delay after switching is large.

Summary of the invention

The embodiment of the invention provides a cross-system switching method and device, and a computer storage medium, which solves the problem that the switching delay of 5G to 4G is large or the data transmission delay after switching is large.

According to an aspect of the embodiments of the present invention, a cross-system handover method is provided. The method includes: a first access and mobility management function AMF learns that a user equipment UE cross-system handover occurs, where cross-system handover refers to a UE. Switching from the 5th generation mobile communication technology 5G system to the 4th generation mobile communication technology 4G system, the first AMF is located in the 5G system; in the process of the UE switching from the 5G system to the 4G system, the first AMF will pre-save the UE The target bearer information is sent to the mobility management node function MME, where the MME located in the 4G system is configured to reserve resources on the radio side for the UE according to the received target bearer information.

AMFAMFAMFAMFAMF provides a cross-system switching device according to another aspect of the present invention. The device includes: a learning unit configured to learn that a user equipment UE cross-system handover occurs, where cross-system handover refers to the UE from the fifth The mobile communication technology 5G system is switched to the 4th generation mobile communication technology 4G system; the first sending unit is configured to send the target bearer information of the pre-saved UE to the mobile management during the process of the UE switching from the 5G system to the 4G system. The node function MME, wherein the MME located in the 4G system is configured to reserve resources on the radio side for the UE according to the received target bearer information.

According to another aspect of the present invention, a cross-system switching apparatus is provided, the apparatus comprising: a receiving unit configured to switch from a fifth generation mobile communication technology 5G system to a fourth generation mobile communication technology at a user equipment UE In the process of the 4G system, the access bearer and the mobility management function receive the target bearer information of the UE sent by the first AMF, where the first AMF is located in the 5G system, and the reserved unit is configured to be the UE according to the received target bearer information. Reserve resources on the wireless side.

According to another aspect of the embodiments of the present invention, an access and mobility management function module is provided, the module comprising: a first processor; a first memory configured to store first processor executable instructions; configured to be configured according to The first processor controls the first transmission device that performs the information transceiving communication; wherein the first processor is configured to perform the following operations: learning that the user equipment UE cross-system handover occurs, wherein the cross-system handover refers to the UE moving from the fifth generation The communication technology 5G system is switched to the 4th generation mobile communication technology 4G system; in the process of the UE switching from the 5G system to the 4G system, the target bearer information of the pre-saved UE is sent to the mobility management node function MME, where the 4G system is located The MME is configured to reserve resources on the radio side for the UE according to the received target bearer information.

Another cross-system switching method according to an embodiment of the present invention includes:

The user equipment UE receives the target bearer information corresponding to the default QoS flow Default Qos Flow from the first access and mobility management function AMF in the fifth generation mobile communication technology 5G system, where the target bearer information is: Bearer information used by the UE after switching from the 5G system to the 4th generation mobile communication technology 4G system.

A further cross-system switching device according to an embodiment of the invention includes:

The receiving unit is configured to receive the target bearer information corresponding to the default QoS flow Default Qos Flow in the fifth generation mobile communication technology 5G system, where the target bearer information is: the UE is in the slave 5G The bearer information used after the system switches to the 4G mobile communication technology 4G system.

In accordance with another embodiment of the present invention, a computer storage medium is provided that can be configured to store computer executable code that, when executed, is capable of implementing one or more of the foregoing technical solutions Cross-system switching method.

In the embodiment of the present invention, the first AMF of the access and mobility management function learns that the user equipment UE cross-system handover, wherein the cross-system handover refers to the UE switching from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication. In the technology 4G system, the first AMF is located in the 5G system; in the process of the UE switching from the 5G system to the 4G system, the first AMF sends the target bearer information of the pre-saved UE to the mobility management node function MME, where the 4G system is located The MME is configured to reserve resources on the radio side for the UE according to the received target bearer information, thereby solving the problem that the wireless side cannot reserve resources for the user equipment due to the AMF failing to generate session information during cross-system handover in the related art. A technical problem or a technical problem of delaying the resource reservation for the user equipment, thereby solving the problem that the user equipment cannot obtain the resource for data transmission after switching from the 5G system to the 4G system in the prior art, for the user This increases the rate of switching from a 5G system to a 4G system and increases the data transfer rate after switching from a 5G system to a 4G system.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a network architecture of a mobile communication system in the related art;

2 is a schematic diagram of a network architecture of a mobile communication system in the related art;

3 is a schematic diagram of a network architecture for 4G and 5G bidirectional handover in the related art;

4 is a schematic diagram of an alternative computer terminal in accordance with an embodiment of the present invention;

5 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

6 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

7 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

8 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

9 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

10 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

11 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

12 is a flow chart of an alternative cross-system handover method in accordance with an embodiment of the present invention;

13 is a schematic diagram of an optional cross-system switching device in accordance with an embodiment of the present invention;

14 is a schematic diagram of an alternative cross-system switching device in accordance with an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

The research found that in the process of 5G system switching to 4G system, AMF is a network element unrelated to the session, and it has no session related data. The MME must reserve resources in the wireless measurement (ie, the eNB side) according to the session related parameters (such as bearer information) received in the handover request. Therefore, in the embodiment of the present invention, if the user equipment switches from the 5G system to the 4G system, the AMF sends the target bearer information of the pre-saved UE to the mobility management node function MME, so that the MME can receive the target bearer information. The resource is reserved for the user equipment, thereby improving the problem that the handover delay is large due to the inability of the UE to obtain resources or the resources of the 4G system are delayed, and the data transmission delay after the handover is large. The following further explanation and illustrations are made in conjunction with the specific embodiments, but the scope of the present application is defined by the claims, and is not limited to the following examples. The method embodiment provided in Embodiment 1 of the present application can be executed in a mobile terminal, a computer terminal or the like. For example, running on a computer terminal, as shown in FIG. 4, the computer terminal may include one or more (only one shown) processor 401 (the processor 401 may include, but is not limited to, a microprocessor MCU or programmable A processing device such as a logic device FPGA, a memory 403 for storing data, and a transmission device 405 for communication functions. It will be understood by those skilled in the art that the structure shown in FIG. 4 is merely illustrative and does not limit the structure of the above electronic device.

The memory 403 can be configured as a software program and a module for storing application software, such as program instructions/modules corresponding to the control method of the device in the embodiment of the present invention, and the processor 401 executes by executing a software program and a module stored in the memory 403. Various functional applications and data processing, that is, the above methods are implemented. The memory can include high speed random access memory and can also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, the memory can further include memory remotely located relative to the processor, which can be connected to the computer terminal over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device is for receiving or transmitting data via a network. The above-described network specific examples may include a wireless network provided by a communication provider of a computer terminal. In one example, the transmission device includes a Network Interface Controller (NIC) that can be connected to other network devices through the base station to communicate with the Internet.

It should be noted that the access and mobility management function module and the mobility management node function module of the present application may be the foregoing computer terminals.

In accordance with an embodiment of the present invention, a method embodiment of a method of switching across systems is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

FIG. 5 is a flowchart of an optional cross-system switching method according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:

Step S501, the first access and mobility management function AMF learns that the user equipment UE cross-system handover, and the cross-system handover refers to the UE switching from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system, first The AMF is located in a 5G system.

Step S502, in the process of the UE switching from the 5G system to the 4G system, the first AMF sends the target bearer information of the pre-saved UE to the mobility management node function MME, and the MME located in the 4G system is used to receive the target bearer according to the received target. The information is that the UE reserves resources on the radio side.

Through the foregoing embodiment, the access and mobility management function first AMF learns that the user equipment UE cross-system handover, and the cross-system handover refers to that the UE switches from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system. The first AMF is located in the 5G system; in the process of the UE switching from the 5G system to the 4G system, the first AMF sends the target bearer information of the pre-saved UE to the mobility management node function MME, and the MME located in the 4G system uses The received target bearer information is that the UE reserves resources on the radio side. Therefore, the technical problem that the wireless side cannot reserve resources for the user equipment caused by the AMF unable to generate session information during the cross-system handover in the related art is solved, and the technology for reserving resources for the user equipment on the wireless side during cross-system handover is realized. effect.

It should be noted that, in FIG. 1 to FIG. 3, interfaces between the AMF and the MME (such as S1-C, S11, Gx, N2, N3, Nx, S5-C, etc.) communicate for the two network elements. interface.

The above method is a method of operating AMF in a 5G system.

In an optional embodiment, before the first AMF learns that the UE cross-system handover, the first AMF receives and saves the default bearer information sent by the session control function SMF in the 5G system; the target bearer information includes at least the default bearer. The information, the default bearer information is the bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow generated by the SMF in the process of establishing a protocol data unit PDU session for the UE in the 5G system.

In order to ensure that the saved default bearer information is always up-to-date, after the first AMF receives and saves the default bearer information sent by the session control function SMF in the 5G system, when the default quality of service flow changes, the first AMF receives the SMF. The default bearer information that is retransmitted, where the default bearer information currently received by the first AMF is the bearer information corresponding to the changed default quality of service flow generated by the SMF when the default quality of service flow changes; An AMF replaces the saved default bearer information with the currently received default bearer information.

In another optional embodiment, before the first AMF learns that the UE cross-system handover occurs, the first AMF receives and saves the dedicated bearer information sent by the SMF in the 5G system; the target bearer information includes default bearer information and a dedicated bearer. The information, the dedicated bearer information is bearer information used in the 4G system corresponding to the dedicated quality of service stream generated by the SMF when the dedicated quality of service stream (Dedicated Qos Flow) is established for the UE in the 5G system.

When the UE is switched from the first AMF to the second AMF in the 5G system, the first AMF sends the saved target information of the UE to the second AMF, where the second AMF is used to save the target bearer information of the received UE. .

According to an embodiment of the present invention, a method embodiment of a cross-system handover method is also provided, which is a method for running an MME in a 4G system. The method includes:

Step S101, in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, the mobility management node function MME receives the access and mobility management function of the UE sent by the first AMF. Target bearer information, wherein the first AMF is located in the 5G system, and the MME is located in the 4G system;

Step S102: The MME reserves resources on the radio side for the UE according to the received target bearer information.

Through the above embodiment, in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, the mobility management node function MME receives the access and mobility management function sent by the first AMF. Target bearer information of the UE, where the first AMF is located in the 5G system, and the MME is located in the 4G system, and the MME reserves resources for the UE on the radio side according to the received target bearer information. Therefore, the technical problem that the wireless side cannot reserve resources for the user equipment caused by the AMF unable to generate session information during the cross-system handover in the related art is solved, and the technology for reserving resources for the user equipment on the wireless side during cross-system handover is realized. effect.

Optionally, in step S101, the MME receives the target bearer information of the UE that is sent by the first AMF, where the MME receives the default bearer information sent by the first AMF, where the target bearer information includes at least default bearer information, and the default bearer. The information is bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow generated by the session control function SMF in the process of establishing a protocol data unit PDU session for the UE in the 5G system.

Optionally, in step S101, the MME receiving the target bearer information of the UE that is sent by the first AMF further includes: the MME receiving the dedicated bearer information sent by the first AMF, where the target bearer information includes default bearer information and dedicated bearer information, The dedicated bearer information is bearer information used in the 4G system corresponding to the dedicated quality of service stream generated by the SMF when the dedicated quality of service stream (Dedicated Qos Flow) is established for the UE in the 5G system.

In the embodiment of the present application, a cross-system handover method is provided. When a UE establishes a PDU session (that is, a PDU session) in a 5G system, the network side SMF generates Bearer information corresponding to the deafault Qos flow (ie, bearer information). information). The SMF sends this information to the UE and the AMF for saving.

When a dedicated QoS flow is established for the UE in the 5G system, the network generates Bearer information corresponding to the QoS flow, and the SMF sends the information to the UE and the AMF for saving.

During the 5G to 4G system handover process, the AMF sends the saved bearer information to the MME. The MME reserves resources on the radio side according to the bearer information.

When the UE is in the 5G system, the deafault Qos flow changes, the network updates the Bearer information corresponding to the deafault Qos flow, and the SMF sends the updated information to the UE and the AMF for saving.

When the UE internally performs AMF handover in the 5G system, the destination AMF (ie, the switched AMF) obtains Bearer information in the 4G system corresponding to the saved QoS flow from the source AMF (AMF before handover).

In some embodiments, a cross-system switching method is also provided, including:

The user equipment UE receives the target bearer information corresponding to the default QoS flow Default Qos Flow in the fifth generation mobile communication technology 5G system, where the target bearer information is: the UE is switched from the 5G system to the fourth Bearer information used after the mobile communication technology 4G system. For example, as shown in any one of FIG. 6, FIG. 7, FIG. 8 and FIG. 9, the AMF sends the target bearer information to the UE by using an RRC configuration request, and the UE may receive the information from the corresponding AMF. The target carries information, thereby starting to perform switching of the 5G system to the 4G system, and the like.

Optionally, the target bearer information is that the first AMF is received from the session management function SMF. The target bearer information can be generated by the SMF. Optionally, the default bearer information is the same as the default quality of service flow generated by the SMF in the 4G system when the protocol data unit PDU session is established for the UE in the 5G system. The bearer information of the default bearer; the dedicated bearer information is when the dedicated service quality stream (Dedicated Qos Flow) is established for the UE in the 5G system, and the SMF generates the corresponding service quality flow corresponding to the dedicated Bearer information of dedicated bearers in the 4G system.

The embodiment further provides a cross-system switching device, which can be applied to the UE, and includes:

The receiving unit may be configured to receive the target bearer information from the first AMF during handover of the UE from the 5G system to the 4G system. In still other embodiments, the switching device may further include: a storage unit, where the storage unit is configured to store the target bearer information.

Embodiments of the present application are described in detail below with reference to FIGS. 6 through 12.

FIG. 6 is an implementation manner of establishing a PDU session in an embodiment of the present invention.

Step S601: The terminal determines to initiate a new PDU session, and then initiates a PDU session establishment request, and the mobility NAS message sent by the UE to the AMF includes the session NAS message cell sent by the UE to the SMF. The session NAS message cell has a PDU session type with a new request session, a selected SSC mode, etc., and an indication to support 5G and 4G IWK.

Step S602, the NG RAN sends a PDU session establishment request to the AMF.

Step S603, the AMF receives and parses the mobility NAS message, selects an appropriate SMF according to the information therein (that is, SMF/PGW-C in the present application), and saves the correspondence between the PDU session identifier and the selected SMF. The AMF forwards the session NAS message, the data network name, and the user identity, PDU session ID to the selected SMF (ie, the send session establishment request is sent to the SMF).

Step S604, the SMF obtains the subscription data of the user from the SDM.

Step S605, the SMF checks the user subscription, determines whether the PDU session request is allowed, and determines the QoS information of the PDU session pre-authorization, which includes information (including QoS) of the default bearer of the UE when the 4G access is performed. The optional SMF may also negotiate with the PCF to determine the default QoS information required for the PDU session, as well as the default bearer information (including QoS) for 4G access.

Step S606: The SMF selects an appropriate user plane function UPF according to the session information, and sends an N4 session establishment request to the selected UPF. The message request includes the requested QoS and the like, and at least includes the QoS flow label and the corresponding uplink and downlink flows. template. The UPF establishes an N4 session-related context, and stores the QoS information. The UPF allocates the N3 tunnel uplink tunnel identifier of the session, and returns an N4 session establishment response to the SMF, where the UP3 allocates the N3 tunnel uplink tunnel identifier.

Step S607, the SMF acquires the tunnel identifier allocated by the UPF, and requests the base station to establish the radio resource of the session through the AMF. The SMF sends a message to the AMF with the SM cell. The cell includes the PDU session identifier, the QoS information of the session request, and the N3 tunnel uplink tunnel identifier assigned by the UPF to the session. In addition, the SMF brings the information of the default QoS flow and the information of the default bearer of the UE during 4G access to the AMF, and the AMF stores the information (including QoS) of the default bearer when the 4G access is performed.

Step S608, the AMF sends an N2-AP radio resource setup request message to the base station. It contains the information of the default QoS flow received by the AMF and the default bearer information of the UE when it accesses the 4G.

Step S609, the base station allocates a radio resource according to the received QoS information, and interacts with the terminal to establish a wireless dedicated bearer of the session. The radio resource control (RRC) configuration request message sent by the base station to the UE carries the information of the default QoS flow received from the AMF and the information of the default bearer of the UE when the 4G accesses. The base station allocates an N3 tunnel downlink tunnel identifier.

Step S610, the terminal performs an RRC configuration response.

Step S611, the base station returns an N2-AP radio resource setup response message to the AMF, where the N3 tunnel downlink tunnel identifier is allocated by the base station, that is, as shown in FIG. 6, the NG RAM sends a radio resource setup response to the AMF.

Step S612, the AMF returns a radio resource setup response message to the SMF, where the N3 tunnel downlink tunnel identifier is allocated by the base station, that is, as shown in FIG. 6, the AMF sends a radio resource setup response to the SMF.

In step S613, the SMF sends an N4 session update request to the UPF, and sends the N3 tunnel downlink tunnel identifier assigned by the base station to the User Plane Function (UPF).

Step S614, optionally, the AMF may also send the information of the default QoS flow and the information of the default bearer of the UE when the 4G access is sent to the UE by using the NAS message.

The above steps S612 and S614 may be in parallel.

Step S615, the SMF returns a PDU session establishment response to the AMF, and the QoS information of the session includes at least a pre-authorized QoS flow identifier and a corresponding upstream template. Optionally, the information about the default QoS flow and the information about the default bearer of the UE when the 4G is accessed may be included, and the AMF stores the information of the default bearer when the 4G access is used as the transparent data.

Step S616, the AMF forwards the PDU session establishment response to the UE. The terminal saves the information of the received default Qos flow and the default bearer information of the UE when accessing the 4G.

In step S617, the PDU session is established, and the UE requests the network to allocate an IP address through the PDU session, and a new PDU session is established through the foregoing steps, and the terminal can send and receive uplink and downlink data through the PDU session.

FIG. 7 is a schematic diagram of an embodiment of establishing a PDU session in a Home Routed scenario according to an embodiment of the present invention.

Step S701: The terminal determines to initiate a new PDU session, and then initiates a PDU session establishment request, and the mobility NAS message sent by the UE to the AMF includes the session NAS message cell sent by the UE to the SMF. The session NAS message cell has a PDU session type with a new request session, a selected SSC mode, etc., and an indication to support 5G and 4G IWK.

Step S702, the AMF receives and parses the mobility NAS message, selects an appropriate visited network V-SMF according to the information therein, and saves the correspondence between the PDU session identifier and the selected V-SMF. The AMF forwards the session NAS message, the data network name, and the user ID and the PDU session identifier to the selected V-SMF, that is, sends a PDU session establishment request.

Step S703, an N4 session is established, and the V-SMF selects an appropriate user plane function V-UPF according to the session information, and sends an N4 session establishment request to the selected V-UPF. The V-UPF allocates the N3 tunnel uplink tunnel identifier of the session, and the N9 tunnel downlink identifier, and returns it to the V-SMF.

Step S704, the V-SMF forwards the session NAS message (including the N9 tunnel downlink identifier) to the user's home network. The user home network selects the appropriate H-SMF (also known as SMF/PGW-C in this application). The H-SMF obtains the user's subscription data from the SDM. (Simplified period, not shown in the figure), that is, a PDU session establishment request is sent.

Step S705: The H-SMF checks the user subscription, determines whether the PDU session request is allowed, and determines the QoS information of the pre-authorization of the PDU session, where the information (including QoS) of the default bearer of the UE when the 4G access is included. The optional SMF may also negotiate with the PCF to determine the default QoS information required for the PDU session, as well as the default bearer information (including QoS) for 4G access.

Step S706: The H-SMF selects an appropriate user plane function H-UPF according to the session information, and sends an N4 session establishment request to the selected H-UPF, where the message request carries information such as requested QoS, where at least the QoS flow label is included. And the corresponding uplink and downlink flow template, and the N9 tunnel downlink identifier. The H-UPF establishes an N4 session-related context, and stores the QoS information. The UPF allocates the N9 tunnel uplink tunnel identifier of the session, and returns an N4 session setup response to the SMF, where the N9 tunnel uplink tunnel identifier is allocated by the H-UPF.

Step S707, the radio resource request is established. The H-SMF obtains the tunnel identifier assigned by the UPF, and requests the base station to establish the radio resource of the session through the V-SMF and the AMF. The message is sent to the V-SMF, and includes the SM cell. The cell includes the PDU session identifier, the QoS information of the session request, and the N9 tunnel uplink tunnel identifier allocated by the UPF for the session, and the V-SMF identifies the N9 tunnel uplink identifier. Replace with the N3 tunnel upstream identifier and forward the information to AMF. The QoS information also includes information about the default bearer of the UE when the 4G is accessed.

Step S708: The V-SMF sends the message to the AMF, and the AMF saves the information (including QoS) of the default bearer when the 4G access is performed, that is, sends a radio resource request setup message.

Step S709, the AMF sends an N2-AP radio resource setup request message to the base station. It contains the information of the default QoS flow received by the AMF and the default bearer information of the UE when it accesses the 4G.

Step S710: The base station allocates a radio resource according to the received QoS information, and interacts with the terminal to establish a wireless dedicated bearer of the session. Optionally, the RRC configuration request message sent by the base station to the UE carries information about the default QoS flow received from the AMF and information about the default bearer of the UE when the 4G is accessed. The base station allocates an N3 tunnel downlink tunnel identifier.

Step S711, returning an RRC configuration response message.

Step S712, the base station returns an N2-AP radio resource setup response message to the AMF, where the N3 tunnel downlink tunnel identifier allocated by the base station is carried.

Step S713, the AMF returns a radio resource setup response message to the V-SMF, where the N3 tunnel downlink tunnel identifier allocated by the base station is carried.

Step S714: The V-SMF sends an N4 session update request to the UPF, and sends the N3 tunnel downlink tunnel identifier allocated by the base station and the N9 tunnel uplink identifier allocated by the H-UPF to the V-UPF.

Step S715, the V-SMF forwards the radio resource setup response to the H-SMF.

Step S716, optionally, the AMF may also send the information of the default QoS flow and the information of the default bearer of the UE when the 4G access is sent to the UE by using the NAS message.

The above steps S716 and S713 may be in parallel.

Step S717: The H-SMF returns a PDU session establishment response to the AMF, and the QoS information of the session includes at least a pre-authorized QoS flow identifier and a corresponding upstream template. Optionally, the information about the default QoS flow and the information about the default bearer of the UE when the 4G is accessed may be included, and the AMF stores the information of the default bearer when the 4G access is used as the transparent data. This message is forwarded to the AMF via the V-SMF.

Step S718, the AMF forwards the PDU session establishment response to the UE. The terminal saves the received pre-authorization QoS information and the information of the default bearer of the UE when the 4G accesses.

Step S719, the UE informs the AMF that the PUD session establishment is completed.

In step S720, the AMF informs the H-SMF that the PUD session establishment is completed. The UE requests the network to allocate an IP address through the PDU session, and a new PDU session is established through the foregoing steps, and the terminal can send and receive uplink and downlink data through the PDU session.

FIG. 8 is a diagram of an embodiment of QoS flow establishment and update in an embodiment of the present invention.

Step S801, an Application Function (AF) request requests a resource of a session from the PCF/PCRF.

Step S802, the PCF/PCRF sends the information of the QoS flow of the UE to the SMF according to the policy, such as adding a new QoS flow, or updating an existing QoS flow. It also includes bearer information when the QoS flow is mapped to 4G access.

Step S803, the SMF/PGW-C updates the QoS flow information of the UPF/PGW-U, such as adding a new QoS flow, or updating the existing QoS flow, wherein the PGW-C updates the bearer information on the PGW-U.

Step S804, the SMF requests the base station to establish a radio resource of the session through the AMF. The SMF sends a message to the AMF with the SM cell. The cell includes the PDU session identifier, the QoS flow information of the session request, and the bearer information corresponding to the QoS flow of the UE when the 4G access is also brought to the AMF, AMF. The information of the corresponding bearer information when the 4G access is saved.

Step S805, the AMF sends an N2-AP radio resource setup request message to the base station. The information about the QoS flow received by the AMF and the corresponding bearer information when the UE accesses the 4G are included.

Step S806, the base station allocates a radio resource according to the received QoS information, and interacts with the terminal to establish or update a wireless dedicated bearer of the session. The RRC message sent by the base station to the UE carries the information of the QoS flow received from the AMF and the bearer information corresponding to the UE when the 4G accesses.

Step S807, returning an RRC configuration response.

Step S808, the base station returns an N2-AP radio resource setup response message to the AMF.

Step S809, the AMF returns a radio resource setup response message to the SMF.

Step S810, optionally, the AMF may also send the information of the QoS flow and the bearer information corresponding to the UE during the 4G access to the UE by using the NAS message.

The above steps S809 and S810 may be in parallel.

FIG. 9 is an embodiment of the default QoS flow information in the embodiment of the present invention.

In step S901, the information of the default Qos flow is changed for various reasons, such as the PCF/PCRF notifying the SMF.

In step S902, the SMF/PGW-C updates the default QoS flow information of the UPF/PGW-U. Among them, the PGW-C may also need to update the default bearer information on the PGW-U.

Step S903, the SMF requests the base station to update the radio resource of the default QoS flow through the AMF. The message sent by the SMF to the AMF carries the SM cell, and the cell includes the PDU session identifier, the default QoS flow information of the session request, and the default bearer information of the UE when the 4G access is also brought to the AMF, and the AMF updates its Previously, the corresponding default bearer information when 4G access is saved.

Step S904, the AMF sends an N2-AP radio resource update request message to the base station. It contains the information of the default QoS flow received by the AMF and the default bearer information of the UE when it accesses the 4G.

Step S905, the base station updates the radio resource according to the received QoS information, and interacts with the terminal to update the wireless dedicated bearer of the session. The RRC message sent by the base station to the UE carries the information of the default QoS flow received from the AMF and the default bearer information corresponding to the UE when the 4G accesses. For example, the base station sends an RRC configuration request according to the QoS information.

Step S906, returning an RRC configuration response.

Step S907, the base station returns an N2-AP radio resource update response message to the AMF.

Step S908, the AMF returns a radio resource update response message to the SMF.

Step S909, optionally, the AMF may also send the information of the default QoS flow and the default bearer information of the UE during 4G access to the UE by using the NAS message.

The above steps S908 and S909 may be in parallel.

FIG. 10 is an embodiment in which the UE moves in an idle state and an AMF change occurs.

Step S1001: The UE sends a NAS message, such as a Tracking Area Update (TAU), to the NG base station.

In step S1002, the base station selects a new AMF (ie, tAMF) and forwards the NAS message to the tAMF.

In step S1003, the tAMF requests the context of the user from the sAMF.

Step S1004, the sAMF provides a context response, and the sAMF sends the security context of the UE, the session context (each PDU session information, including the SMF address, the PDU session ID, and the like) to the tAMF, where the 4G access corresponding to each PDU session is included. Default bearer information.

Step S1005: The tAMF establishes, according to the received context, an N11 interface in the session and the corresponding SMF based on each PDU session.

In step S1006, the SMF returns to establish an interface response.

The subsequent steps are the same as the existing idle state after the TAU process, and will not be described here.

Figure 11 is an embodiment of the UE moving in a connected state, with AMF changes occurring.

In step S1101, the UE moves in the connect state, and the 5G base station determines that the handover needs to be initiated. The NG RAN sends a handover request to the sAMF.

In step S1102, the sAMF finds that the target 5G base station is out of range, and the sAMF selects a new AMF (that is, tSMF). A handover request is sent to the tSMF. The security context is included, and the session context (including the SMF address, PDU session ID, etc. for each PDU session) is sent to the tAMF, which includes the default bearer information for each PDU session at the time of 4G access, and Optionally, the dedicated bearer information corresponding to the normal QoS flow.

Step S1103: The tAMF establishes an N11 interface in the session and the corresponding SMF based on the received context based on the received PDU session.

In step S1104, the SMF returns a setup response.

In step S1105, the tAMF requests the target side base station to reserve resources.

In step S1106, the tAMF returns a handover request response to the sAMF.

The subsequent steps are the same as the existing connect state switching process, and will not be described here.

FIG. 12 is a schematic flowchart of switching from 5G to 4G in the embodiment of the present invention.

The UE initiates a PDU session establishment process. Referring to the foregoing embodiment, the UE attaches to the NG system and establishes a PDU session.

In step S1201, the NG base station (NR RAN) determines that the handover needs to be initiated, and the NG RAN sends a handover request to the AMF.

In step S1202, the AMF determines to switch from 5G to the 4G system, and sends a handover request to the MME. For each PDU session, the SMF address, the APN, and the corresponding bearer information of the stored UE when the 4G access is used (refer to the foregoing embodiment), where at least the default bearer information is included, optionally, may also include Dedicated bearer information.

Step S1203: The MME selects a suitable S-GW to send a create session request (session generation request) according to the received session information.

Step S1204: Send a handover preparation request, and the MME requests the E-UTRAN to establish a default bearer resource according to the received session information. Each session must establish a corresponding default bearer resource.

Step S1205: The E-UTRAN reserves the radio resources required for the UE to access the radio side, and returns a handover preparation request response message with reserved radio resource information. The message also carries the S1-U downlink tunnel identifier assigned by the destination base station 2 for each PDN Connection that is successfully reserved.

Step S1206: The MME returns a handover request response to the AMF, where the radio resource information of the target base station is included.

Step S1207, the AMF returns a handover request response message to the NG base station, with the radio resource information reserved by the destination base station (E-UTRAN base station) for these PDU sessions.

Step S1208: The NG base station sends a handover command to the UE, with the radio resource information reserved by the destination base station.

Step S1209: The user equipment UE accesses from the 4G base station.

In step S1210, the eNB sends a handover complete message to the MME.

Steps S1211 to S1215 are the same as the existing 4G cross-MME switching technology, and are simply described here.

Step S1211: The MME sends a session update request to the S-GW, where the S1-U downlink tunnel identifier is carried.

Step S1212: The S-GW sends a session update request to the PGW-C, where the media information of the S-GW is also carried.

In step S1213, PGW-C and PGW-U interact to allocate media plane resources.

Step S1214, the PGW-C returns a response to the session update request to the S-GW, where the media information of the PGW-U is carried.

In step S1215, the S-GW returns a response to the session update (ie, a session update response) to the MME; at this time, the UE can send/receive uplink and downlink data on the default bearer of the 4G PDN connection.

In step S1216, the MME sends a handover completion indication to the AMF.

In step S1217, the AMF releases the N2 interface of the NG base station. The P-GW then initiates the activation process for the remaining dedicated bearers.

In addition, an optional implementation manner is: if the default bearer information is included in the handover request sent by the AMF to the MME in step S1202, and the 4G dedicated bearer information corresponding to the QoS flow is included, then in step S1204, The MME not only requests the default bearer resource, but also requests the dedicated bearer resource. At this time, the P-GW is not required to initiate the activation process of the remaining dedicated bearers.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

A cross-system switching device is also provided in the embodiment of the present invention. The device is used to implement the above embodiments and preferred embodiments, and the description thereof has been omitted. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

13 is a schematic diagram of an alternative cross-system switching device in accordance with an embodiment of the present invention. As shown in FIG. 13, the apparatus may include: a learning unit 131 and a first transmitting unit 132.

The learning unit 131 is configured to learn that the user equipment UE cross-system handover, wherein the cross-system handover refers to the UE switching from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system;

The first sending unit 132 is configured to send the information to the mobility management node function MME, where the MME located in the 4G system is configured to reserve resources for the UE on the radio side according to the received target bearer information.

Through the foregoing embodiment, the learning unit knows that the user equipment UE cross-system handover, wherein the cross-system handover refers to that the UE switches from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system; the first sending unit is in the UE. In the process of switching from the 5G system to the 4G system, the target bearer information of the pre-saved UE is sent to the mobility management node function MME, where the MME located in the 4G system is configured to use the target bearer information as the UE on the radio side. Reserve resources. Therefore, the technical problem that the wireless side cannot reserve resources for the user equipment caused by the AMF unable to generate session information during the cross-system handover in the related art is solved, and the technology for reserving resources for the user equipment on the wireless side during cross-system handover is realized. effect.

The above device can be applied to AMF in a 5G system.

In the above embodiment, the apparatus further includes: a first saving unit, configured to receive and save default bearer information sent by the session control function SMF in the 5G system before learning that the UE cross-system handover occurs; wherein the target bearer information At least the default bearer information is used. In the process of establishing a protocol data unit PDU session for the UE in the 5G system, the SMF generates the default service quality flow Default Qos Flow corresponding to the PDU session and is used in the 4G system. Bearer information.

Optionally, the first saving unit includes: an information receiving module, configured to receive the default bearer information resent by the SMF after receiving and saving the default bearer information sent by the session control function SMF in the 5G system, where the information receiving The default bearer information currently received by the module is the bearer information corresponding to the changed default quality of service flow generated by the SMF when the default QoS flow changes; the replacement module is used to replace the saved default bearer information. Is the default bearer information currently received.

In an optional embodiment, the apparatus further includes: a second saving unit configured to receive and save the dedicated bearer information sent by the SMF in the 5G system before learning that the UE cross-system handover occurs; wherein the target bearer information includes The default bearer information and the dedicated bearer information are bearer information used in the 4G system corresponding to the dedicated quality of service stream generated by the SMF when the dedicated quality of service stream (Dedicated Qos Flow) is established for the UE in the 5G system.

In another optional embodiment, the apparatus further includes: a second sending unit configured to: when the UE is switched by the access and mobility management function in the 5G system, the first AMF to the second AMF, the UE to be saved The target bearer information is sent to the second AMF, where the second AMF is used to save the target bearer information of the received UE.

14 is a schematic diagram of an alternative cross-system switching device in accordance with an embodiment of the present invention. As shown in FIG. 14, the apparatus may include: a receiving unit 141 and a reservation unit 142.

The receiving unit 141 is configured to receive, in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, the target bearer of the UE sent by the first AMF of the access and mobility management function. Information, wherein the first AMF is located in the 5G system;

The reservation unit 142 is configured to reserve resources on the radio side for the UE according to the received target bearer information.

Through the above embodiment, the receiving unit receives the target of the UE sent by the first AMF of the access and mobility management function in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system. Carrying information, the first AMF is located in the 5G system; the reservation unit reserves resources for the UE on the radio side according to the received target bearer information. Therefore, the technical problem that the wireless side cannot reserve resources for the user equipment caused by the AMF unable to generate session information during the cross-system handover in the related art is solved, and the technology for reserving resources for the user equipment on the wireless side during cross-system handover is realized. effect.

Optionally, the receiving unit includes: a first receiving module, configured to receive default bearer information sent by the first AMF; where the target bearer information includes at least default bearer information, where the default bearer information is established for the UE in the 5G system. During the protocol data unit PDU session, the session control function SMF generates bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.

Optionally, the receiving unit further includes: a second receiving module, configured to receive the dedicated bearer information sent by the first AMF; wherein the target bearer information includes default bearer information and dedicated bearer information, where the dedicated bearer information is in the 5G system. When the UE establishes a dedicated quality of service stream (Dedicated Qos Flow), the bearer generates the bearer information used in the 4G system corresponding to the dedicated quality of service stream.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Embodiments of the present invention also provide a computer storage medium, which may be simply referred to as a storage medium. Optionally, in this embodiment, the foregoing storage medium may be configured to store computer executable code such as program code and application program for performing the following steps:

S11, it is known that the user equipment UE cross-system handover, wherein the cross-system handover refers to the UE switching from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system;

S12, in the process of the UE switching from the 5G system to the 4G system, the target bearer information of the pre-saved UE is sent to the mobility management node function MME, where the MME located in the 4G system is configured to follow the received target bearer information. The UE reserves resources on the radio side.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S21, in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, receiving the target bearer information of the UE sent by the first AMF of the access and mobility management function, where The first AMF is located in the 5G system;

S22. Reserve resources on the radio side for the UE according to the received target bearer information.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc. Optionally, the storage medium is a non-transitory storage medium.

Optionally, in this embodiment, the processor performs, according to the stored program code in the storage medium, that the user equipment UE is involved in cross-system handover, where the cross-system handover refers to that the UE switches from the fifth-generation mobile communication technology 5G system. To the fourth generation mobile communication technology 4G system; in the process of the UE switching from the 5G system to the 4G system, the target bearer information of the pre-saved UE is sent to the mobility management node function MME, where the MME located in the 4G system is used The UE reserves resources on the radio side according to the received target bearer information.

Optionally, in this embodiment, the processor performs, according to the stored program code in the storage medium, in a process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, And receiving, by the access and mobility management function, the target bearer information of the UE sent by the first AMF, where the first AMF is located in the 5G system; and the UE reserves resources on the radio side according to the received target bearer information.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In the technical solution provided by the embodiment of the present invention, if the user equipment switches from the 5G system to the 4G system, the AMF of the 5G system sends the target bearer information to the MME of the 4G system, and after the target bearer system received by the 4G system, The user equipment can be successfully reserved for the user equipment. After the user equipment switches to the 4G system, the reserved resources can be used for communication, thereby solving the problem that the user equipment switches from the 5G system to the 4G system in the prior art because no target bearer information is equal to the session. Relevant information, so that resources cannot be successfully reserved for the user equipment, resulting in a large handover delay of the 5G system to the 4G system or a large data transmission delay after the system switching, thereby having a high system switching rate and data transmission after system switching. The high rate features a positive industrial effect. On the other hand, the technical solution provided by the embodiment of the present invention has the characteristics of high speed and the like.

Claims

A cross-system switching method includes:

The first access and mobility management function AMF learns that the user equipment UE cross-system handover, wherein the cross-system handover refers to that the UE switches from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system. The first AMF is located in the 5G system;

In the process of the UE switching from the 5G system to the 4G system, the first AMF sends the target bearer information of the UE saved in advance to the mobility management node function MME, where the 4G system is located. The MME is configured to reserve resources on the radio side of the UE according to the received target bearer information.
The method according to claim 1, wherein before the first AMF learns that the UE has a cross-system handover, the method further includes:

The first AMF receives and saves default bearer information sent by the session control function SMF in the 5G system;

The target bearer information includes at least the default bearer information, where the default bearer information is generated in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
The method of claim 2, wherein after the first AMF receives and saves the default bearer information sent by the session control function SMF in the 5G system, the method further includes:

The first AMF receives the default bearer information that is sent by the SMF, where the default bearer information currently received by the first AMF is generated by the SMF when the default quality of service flow changes. Bearer information corresponding to the changed default quality of service flow;

The first AMF replaces the saved default bearer information with the currently received default bearer information.
The method according to claim 1, wherein before the first AMF learns that the UE has a cross-system handover, the method further includes:

The first AMF receives and saves dedicated bearer information sent by the SMF in the 5G system;

The target bearer information includes default bearer information and the dedicated bearer information, where the dedicated bearer information is generated by the SMF when a dedicated quality of service flow (Dedicated Qos Flow) is established for the UE in the 5G system. Bearer information used in the 4G system corresponding to the dedicated quality of service stream.
The method of any one of claims 1 to 4, wherein the method further comprises:

When the UE is switched by the first AMF to the second AMF in the 5G system, the first AMF sends the saved target bearer information of the UE to the second AMF, where the The second AMF is configured to save the received target bearer information of the UE.
A cross-system switching method, including:

In the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, the mobility management node function MME receives the target of the UE sent by the access and mobility management function first AMF. Carrying information, wherein the first AMF is located in the 5G system, and the MME is located in the 4G system;

The MME reserves resources for the UE on the radio side according to the received target bearer information.
The method according to claim 6, wherein the receiving, by the MME, the target bearer information of the UE that is sent by the first AMF includes:

Receiving, by the MME, default bearer information sent by the first AMF;

The target bearer information includes at least the default bearer information, where the default bearer information is generated by the session control function SMF in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
The method according to claim 7, wherein the receiving, by the MME, the target bearer information of the UE that is sent by the first AMF further includes:

Receiving, by the MME, dedicated bearer information sent by the first AMF;

The target bearer information includes the default bearer information and the dedicated bearer information, where the dedicated bearer information is used in the 5G system to establish a dedicated quality of service stream (Dedicated Qos Flow) for the UE. The generated bearer information used in the 4G system corresponding to the dedicated quality of service stream.
A cross-system switching device, comprising:

The learning unit is configured to learn that the user equipment UE cross-system handover occurs, where the cross-system handover refers to that the UE switches from the fifth-generation mobile communication technology 5G system to the fourth-generation mobile communication technology 4G system;

a first sending unit, configured to send the target bearer information of the UE saved in advance to the mobility management node function MME, where the UE is in the process of switching from the 5G system to the 4G system, where The MME in the 4G system is configured to reserve resources on the radio side of the UE according to the received target bearer information.
The apparatus of claim 9 wherein said apparatus further comprises:

a first saving unit, configured to receive and save default bearer information sent by the session control function SMF in the 5G system, before learning that the UE cross-system handover occurs;

The target bearer information includes at least the default bearer information, where the default bearer information is generated in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
The apparatus of claim 10, wherein the first saving unit comprises:

The information receiving module is configured to receive the default bearer information resent by the SMF after receiving and saving the default bearer information sent by the session control function SMF in the 5G system, where the information receiving module currently receives The default bearer information is the bearer information corresponding to the changed default quality of service flow generated by the SMF when the default quality of service flow changes;

The replacement module is configured to replace the saved default bearer information with the currently received default bearer information.
The apparatus of claim 9 wherein said apparatus further comprises:

a second saving unit, configured to receive and save dedicated bearer information sent by the SMF in the 5G system, before learning that the UE cross-system handover occurs;

The target bearer information includes default bearer information and the dedicated bearer information, where the dedicated bearer information is generated by the SMF when a dedicated quality of service flow (Dedicated Qos Flow) is established for the UE in the 5G system. Bearer information used in the 4G system corresponding to the dedicated quality of service stream.
The device according to any one of claims 9 to 12, wherein the device further comprises:

a second sending unit, configured to: when the UE is switched by the access and mobility management function first AMF to the second AMF in the 5G system, send the saved target bearer information of the UE to the And a second AMF, where the second AMF is used to save the received target bearer information of the UE.
A cross-system switching device, comprising:

The receiving unit is configured to receive, in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system, receiving the target of the UE sent by the access and mobility management function first AMF Carrying information, wherein the first AMF is located in the 5G system;

The reservation unit is configured to reserve resources on the radio side of the UE according to the received target bearer information.
The apparatus of claim 14, wherein the receiving unit comprises:

The first receiving module is configured to receive default bearer information sent by the first AMF;

The target bearer information includes at least the default bearer information, where the default bearer information is generated by the session control function SMF in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
The apparatus according to claim 15, wherein the receiving unit further comprises:

a second receiving module, configured to receive dedicated bearer information sent by the first AMF;

The target bearer information includes the default bearer information and the dedicated bearer information, where the dedicated bearer information is used in the 5G system to establish a dedicated quality of service stream (Dedicated Qos Flow) for the UE. The generated bearer information used in the 4G system corresponding to the dedicated quality of service stream.
An access and mobility management function module, including:

First processor;

a first memory configured to store the first processor executable instructions;

a first transmission device configured to perform information transceiving communication according to control of the first processor;

The first processor is configured to: perform a cross-system handover of the user equipment UE, where the cross-system handover refers to that the UE switches from a fifth-generation mobile communication technology 5G system to a fourth-generation mobile communication. a technology 4G system; in the process of the UE switching from the 5G system to the 4G system, the target bearer information of the UE saved in advance is sent to a mobility management node function MME, where the 4G system is located in the 4G system The MME is configured to reserve resources on the radio side of the UE according to the received target bearer information.
The access and mobility management function module of claim 17, wherein the first processor is further configured to perform the following operations:

Receiving and saving default bearer information sent by the session control function SMF in the 5G system;

The target bearer information includes at least the default bearer information, where the default bearer information is generated in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
A mobile management node function module, comprising:

Second processor;

a second memory configured to store the second processor executable instructions;

a second transmission device configured to perform information transceiving communication according to control of the second processor;

The second processor is configured to perform the following operations: receiving the access and mobility management function in the process of the user equipment UE switching from the fifth generation mobile communication technology 5G system to the fourth generation mobile communication technology 4G system The target bearer information of the UE that is sent by the AMF, where the first AMF is located in the 5G system; and the UE reserves resources on the radio side according to the received target bearer information.
The mobility management node functional module of claim 19, wherein the second processor is further configured to perform the following operations:

Receiving default bearer information sent by the first AMF;

The target bearer information includes at least the default bearer information, where the default bearer information is generated by the session control function SMF in the process of establishing a protocol data unit PDU session for the UE in the 5G system. The bearer information used in the 4G system corresponding to the default quality of service flow Default Qos Flow of the PDU session.
A cross-system switching method includes:

The user equipment UE receives the target bearer information corresponding to the default QoS flow Default Qos Flow from the first access and mobility management function AMF in the fifth generation mobile communication technology 5G system, where the target bearer information is: Bearer information used by the UE after switching from the 5G system to the 4th generation mobile communication technology 4G system.
The method of claim 21 wherein said target bearer information is received by said first AMF from a session management function SMF.
The method of claim 22, wherein

The target bearer information includes default bearer information and dedicated bearer information;

The default bearer information is a default bearer in the 4G system corresponding to the default quality of service stream generated by the SMF when the protocol data unit PDU session is established for the UE in the 5G system. Carrying information;

The dedicated bearer information is a bearer dedicated to the bearer in the 4G system corresponding to the dedicated quality of service stream generated by the SMF when the dedicated quality of service stream (Dedicated Qos Flow) is established for the UE in the 5G system. information.
A cross-system switching device comprising:

The receiving unit is configured to receive the target bearer information corresponding to the default QoS flow Default Qos Flow in the fifth generation mobile communication technology 5G system, where the target bearer information is: the UE is in the slave 5G The bearer information used after the system switches to the 4G mobile communication technology 4G system.
A computer storage medium storing a computer executable program; the computer executable program being capable of implementing the cross system provided by any one of claims 1 to 5 or 6 to 8 or 21 to 23 Switching method.