CN110049519A

CN110049519A - Session establishing method, session transferring method, equipment and storage medium

Info

Publication number: CN110049519A
Application number: CN201810036898.6A
Authority: CN
Inventors: 金辉; 欧阳国威; 杨皓睿; 段小嫣; 窦凤辉; 李小娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-01-15
Filing date: 2018-01-15
Publication date: 2019-07-23
Anticipated expiration: 2038-01-15
Also published as: CN110049519B

Abstract

The application provides a kind of session establishing method, session transferring method, equipment and storage medium, during wherein session transferring method includes: that UE carries out PDU session establishment in 5G communication system, sending instruction UE to AMF requests the PDU Session Hand-off established to the precedence information of the priority of 4G communication system, in subsequent need the PDU Session Hand-off of UE to 4G communication system, by AMF according to the precedence information of each PDU session, which determine PDU Session Hand-off to 4G communication system, and carry out subsequent Session Hand-off process, PDN connection is completed in 4G communication system to establish, realize that UE is moved to during 4G communication system from 5G communication system, the purpose of the property of can choose transfer PDU session.

Description

Session establishing method, session transferring method, equipment and storage medium

Technical field

This application involves the communication technologys more particularly to a kind of session establishing method, session transferring method, equipment and storage to be situated between Matter.

Background technique

With the fast development of the communication technology, there are a variety of use such as smart phone, tablet computer, portable device Family equipment (User Equipment, UE), these UE can support the mobile communications network in different generations simultaneously, and can be in difference It is switched between the mobile communications network in generation.For example, UE can be moved from the 5th generation (5th Generation, 5G) communication network It moves to forth generation (Forth Generation, 4G) communication network, 5G communication network is the extension of 4G communication network, has high property Characteristics, the maximum data transmission speeds such as energy, low latency and high capacity can reach tens of Gbps or more.

When UE is moved to 4G communication network from 5G communication network, how PDU session of the UE in 5G communication network to be turned It moves to and establishes PDN in 4G communication network and be connected to become urgent problem to be solved.

Summary of the invention

The application provides a kind of session establishing method, session transferring method, equipment and storage medium, for realizing UE in 5G PDU session is established in communication network, and realizes that UE is established in the PDU Session Hand-off in 5G communication network into 4G communication network PDN connection.

In a first aspect, the application provides a kind of session establishing method, which comprises

UE sends first message to access and AMF, and the first message is for establishing PDU session；Wherein, described first disappears Breath includes the request of PDU session establishment and precedence information, and the precedence information is used to indicate the PDU meeting that the UE request is established Words are transferred to the priority of 4G communication system；

The UE receives the AMF and sends second message, and the second message receives comprising PDU session establishment.

Optionally, the method also includes:

The UE determines the precedence information according to the combination of one or more of information:

The corresponding S-NSSAI of the PDU session；

Use the application of the PDU session；

The URSP that the UE is saved；

The qos parameter of the corresponding QoS flow of default QoS rule for the PDU session that the UE request is established.

Optionally, the second message further include:

The precedence information for the PDU session that network determines.

Optionally, the UE stores the precedence information for the PDU session that the network determines.

Optionally, the method also includes:

When the UE is moved to 4G communication system from 5G communication system, the UE is corresponding each according to the DNN used The precedence information of PDU session determines the first PDU session for being transferred to 4G communication system.

Optionally, the UE determines that being transferred to 4G leads to according to the precedence information of the corresponding each PDU session of the DNN used First PDU session of letter system, comprising:

The UE is according to the corresponding precedence information of the corresponding each PDU session of the DNN, by wherein highest priority PDU session is determined as being transferred to the first PDU session of 4G communication system.

Second aspect, the application provide a kind of session transferring method, which comprises

When UE is moved to 4G communication system from 5G communication system, AMF sends the corresponding PDN of the first PDU session to MME and connects The information connect, the information of the PDN connection are that the UE establishes PDN connection for the MME；

Wherein, the first PDU session is to be transferred to 4G in the multiple PDU sessions for the first DNN of use that the UE is established The PDU session of the highest priority of communication system.

Optionally, the method also includes:

During the first PDU session establishment, the AMF receives the precedence information that the UE is sent；Alternatively,

The AMF receives the precedence information for the first PDU session that the first SMF+PGW-C is sent；

Wherein, the precedence information is used to indicate the priority of the first PDU Session Hand-off to 4G communication system.

Optionally, the AMF receives the precedence information for the first PDU session that the first SMF+PGW-C is sent, packet It includes:

In EBI assigning process, the AMF receives the excellent of the first PDU session that the first SMF+PGW-C is sent First grade information.

Optionally, in EBI assigning process, the AMF receives the first PDU that the first SMF+PGW-C is sent The precedence information of session, comprising:

The AMF receives the EBI distribution request that the first SMF+PGW-C is sent；

If the AMF determines to be that the corresponding 2nd PDU session of the first DNN is assigned with EBI, and described second Corresponding 2nd SMF+PGW-C of PDU session is different from the first SMF+PGW-C, then judges the priority of the first PDU session Whether the priority of the twoth PDU session is higher than；

If the priority of the first PDU session is higher than the priority of the 2nd PDU session, the AMF is described First PDU session distributes EBI；

Alternatively,

If the AMF determines to be that the corresponding 3rd PDU session of the first DNN is assigned with EBI, and the third PDU session corresponds to the first SMF+PGW-C, then the AMF is that the first PDU session distributes EBI；

Alternatively,

If the AMF determines locally to have saved corresponding 2nd SMF+PGW-C of the first DNN, and the first SMF+ The corresponding priority of PGW-C is higher than the corresponding priority of the 2nd SMF+PGW-C, then the AMF is the first PDU session Distribute EBI；

Alternatively,

If the AMF determines that corresponding first SMF+PGW-C of the first DNN, the AMF are the first PDU meeting Words distribution EBI.

Optionally, the EBI distribution request includes the mark of the first PDU session, which comprises

The AMF determines corresponding first DNN of the first PDU session according to the mark of the first PDU session.

Optionally, the method also includes:

The AMF determines the first SMF+PGW-C according to the priority of the corresponding S-NSSAI of SMF+PGW-C of preservation Corresponding priority and the corresponding priority of the 2nd SMF+PGW-C；

Alternatively,

The AMF obtains the corresponding priority of each SMF+PGW-C.

Optionally, the method also includes:

The AMF sends the information of the corresponding PDN connection of the 4th PDU session to the MME, the 4th PDU session and The first PDU session uses identical DNN and SMF+PGW-C.

Optionally, the method also includes:

The AMF obtains the first PDU session of highest priority in the corresponding multiple PDU sessions of the first DNN；

The AMF requests the first PDU session corresponding to corresponding first SMF+PGW-C of the first PDU session The information of the PDN connection；

Alternatively,

The AMF requests the first PDU session corresponding to corresponding first SMF+PGW-C of the first PDU session The information of the PDN connection, and obtain the information of the corresponding PDN connection of other PDU sessions using the first DNN.

Optionally, the AMF receives the precedence information for the first PDU session that the first SMF+PGW-C is sent, Include:

The AMF receives the corresponding default quality of service rule of the first PDU session that the first SMF+PGW-C is sent Then corresponding distribution keeps priority ARP, or,

The AMF receives the preferential of the corresponding S-NSSAI of the first PDU session that the first SMF+PGW-C is sent Grade, or,

The AMF receives and saves the priority that the UE that the first SMF+PGW-C is sent is provided.

Optionally, the precedence information that the received UE of the AMF is sent, comprising:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

The priority of the corresponding S-NSSAI and DNN of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

The third aspect, the application provide a kind of session establishing method, which comprises

SMF+PGW-C obtains the PDU Session Hand-off of the UE to 4G communication system during the PDU session establishment of UE Precedence information；

The precedence information is sent to UDM+HSS or AMF by the SMF+PGW-C.

Optionally, the precedence information is the PDU Session Hand-off that sends of the received UE to 4G communication system Priority；

Alternatively,

The precedence information is the PDU meeting that the SMF+PGW-C is determined according to the S-NSSAI of the PDU session Words are transferred to the priority of 4G communication system；

Alternatively,

The precedence information is the SMF+PGW-C according to the S-NSSAI and DNN of the PDU session determination PDU Session Hand-off to 4G communication system priority.

Fourth aspect, the application provide a kind of session transferring method, which comprises

The address of DNN, SMF+PGW-C that the PDU session for the UE that UDM+HSS is saved uses and the corresponding of priority are closed System；Wherein, priority is used to indicate the corresponding priority for being transferred to 4G communication system of the corresponding PDU session of SMF+PGW-C, or Person, the priority are used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

The UDM+HSS determines the UE the first SMF+ used in 4G communication system according to the priority of preservation The address PGW-C；

The UDM+HSS sends the first address SMF+PGW-C and APN to MME；Wherein, the APN with it is described DNN is corresponding.

Optionally, described according to the priority, determine the UE the first SMF+PGW-C used in 4G communication system Address, comprising:

The UDM+HSS determines in the corresponding all SMF+PGW-C of the DNN, the ground of the SMF+PGW-C of highest priority Location is as the first address SMF+PGW-C.

Optionally, the method also includes:

The UDM+HSS receives the address DNN, SMF+PGW-C and priority that SMF+PGW-C is sent；

The UDM+HSS determines whether to save pair between other corresponding SMF+PGW-C of the DNN and priority It should be related to；

If so, the UDM+HSS judge the corresponding priority of the SMF+PGW-C whether be higher than saved it is described The corresponding priority of other corresponding described SMF+PGW-C of DNN；

If so, UDM+HSS saves the corresponding relationship of the SMF+PGW-C Yu the priority.In the specific implementation, SMF+ Corresponding relationship between PGW-C and priority, can be by the corresponding relationship between the address SMF+PGW-C and priority come table Show.

Optionally, the corresponding relationship of described DNN, SMF+PGW-C and priority, comprising:

The corresponding relationship of APN, SMF+PGW-C and priority corresponding with DNN；Alternatively,

The corresponding relationship of DNN, S-NSSAI, SMF+PGW-C and priority；Alternatively,

The corresponding relationship of APN, S-NSSAI, SMF+PGW-C and priority corresponding with DNN；Alternatively,

The corresponding relationship of PDU session identification, SMF+PGW-C and priority.

5th aspect, the application provide a kind of session transferring method, which comprises

The address of APN, SMF+PGW-C used in the PDU Session Hand-off to 4G communication system for the UE that UDM+HSS is saved With the corresponding relationship of priority；Wherein, priority is used to indicate the corresponding 4G that is transferred to of the corresponding PDU session of SMF+PGW-C and leads to The priority of letter system, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

The UDM+HSS sends the first address SMF+PGW-C and the first address pair SMF+PGW-C to MME The APN answered.

Optionally, the UDM+HSS is according to the priority of preservation, determines the UE first used in the 4G communication system The address SMF+PGW-C, comprising:

The UDM+HSS is determined in the SMF+PGW-C saved, the SMF+ of highest priority according to the corresponding relationship The address of PGW-C is as the first address SMF+PGW-C.

Optionally, the method also includes:

The UDM+HSS receives the address APN, SMF+PGW-C and priority that SMF+PGW-C is sent；

The UDM+HSS determine it is local whether save other corresponding SMF+PGW-C of the corresponding DNN of the APN and Corresponding relationship between priority；

If so, UDM+HSS saves the corresponding relationship of the SMF+PGW-C Yu the priority.

Optionally, the corresponding relationship of described APN, SMF+PGW-C and priority, comprising:

6th aspect, the application provide a kind of session transferring method, which comprises

When UE is determined the first PDU Session Hand-off to 4G communication system, the UE is obtained and the first PDU session pair The first APN answered；

The UE sends PDN connection to MME and establishes request；The PDN connection establishes in request and carries the first PDU meeting Talk about corresponding first APN；

The UE, which receives the PDN connection that MME is sent and establishes, to be received, to establish the PDN connection.

Optionally, the UE obtains first APN corresponding with the first PDU session, comprising:

The UE is obtained corresponding with the first PDU session according to the corresponding relationship between the PDU session of preservation and APN The first APN.

Optionally, the corresponding relationship between the PDU session and APN includes:

Corresponding relationship between the single network slice selection auxiliary information S-NSSAI and DNN and APN of PDU session；

Alternatively,

Corresponding relationship between the PDU session identification and APN of PDU session.

Optionally, the method also includes:

In the establishment process of the first PDU session, it is sending with the first PDU that the UE receives SMF+PGW-C Corresponding first APN of session；

The UE is obtained and is saved the corresponding relationship between the first PDU session and the first APN.

The UE determines institute corresponding with the S-NSSAI and DNN of the first PDU according to UE routing strategy URSP State the first APN；

Alternatively,

The UE generates first APN corresponding with the S-NSSAI and DNN of the first PDU.

Optionally, the method also includes:

The UE receives first APN-AMBR corresponding with the first PDU session that SMF+PGW-C is sent.

7th aspect, the application provide a kind of session establishing method, which comprises

SMF+PGW-C receives the PDU session establishment request that UE is sent；

The SMF+PGW-C obtains APN corresponding with the PDU session of UE request foundation；

The SMF+PGW-C sends the address of the APN Yu the SMF+PGW-C to UDM+HSS；

The SMF+PGW-C sends PDU session establishment to the UE and receives, and completes the establishment process of the PDU session.

Optionally, the PDU session establishment request packet includes S-NSSAI and DNN, the SMF+PGW-C obtain with it is described The corresponding APN of PDU session that UE request is established, comprising:

The SMF+PGW-C obtains APN corresponding with the S-NSSAI and DNN.

Optionally, the SMF+PGW-C obtains APN corresponding with the S-NSSAI and DNN, comprising:

The SMF+PGW-C is obtained corresponding with the S-NSSAI and DNN described according to the policy information of preservation APN。

Alternatively,

The SMF+PGW-C is obtained and the S- according to the S-NSSAI and DNN of preservation and the corresponding relationship of APN The corresponding APN of NSSAI and DNN.

Optionally, the PDU session establishment request packet includes the APN, and the SMF+PGW-C is obtained to be built with UE request The vertical corresponding APN of PDU session, comprising:

The SMF+PGW-C obtains the APN from PDU session establishment request.

It optionally, include the APN in the PDU session establishment receiving.

Optionally, the method also includes:

The SMF+PGW-C obtains APN-AMBR corresponding with the APN.

Optionally, the method also includes:

The APN-AMBR corresponding with the APN is sent to the UE by the SMF+PGW-C；

And/or

The APN-AMBR corresponding with the APN is sent to the UDM+HSS by the SMF+PGW-C.

Optionally, the SMF+PGW-C obtains APN-AMBR corresponding with the APN, comprising:

The SMF+PGW-C obtains APN-AMBR corresponding with the APN according to the session AMBR of the UE；

Alternatively,

The SMF+PGW-C obtains APN-AMBR corresponding with the APN according to the signing information of the UE.

Optionally, session AMBR of the SMF+PGW-C according to the UE in current network is obtained and described APN pairs The APN-AMBR answered, comprising:

The session AMBR for using all PDU sessions of DNN corresponding with the APN is added to obtain by the SMF+PGW-C The APN-AMBR.

Optionally, the method also includes:

The SMF+PGW-C sends the first information to UDM+HSS, and the first information determines institute for the UDM+HSS State the corresponding APN-AMBR of APN.

Optionally, the first information includes:

The APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；

Alternatively,

The corresponding DNN of the PDU session；

Alternatively,

The corresponding APN of DNN corresponding with the PDU session.

Eighth aspect, the application provide a kind of session transferring method, which comprises

When UE, which is determined, to be needed PDU session being moved to 4G from 5G, the UE sends PDN connection request to MME；It is described PDN connection request carries the corresponding APN and PDU session identification of the PDU session；

The UE receives the PDN connection response that the MME is returned.

Optionally, the PDN connection request also carries transfer instruction；The transfer instruction, which is used to indicate, turns PDU session Move to 4G communication system.

9th aspect, the application provide a kind of session transferring method, which comprises

MME receives the PDN connection request that UE is sent；The PDN connection request carry the corresponding APN of the PDU session and PDU session identification；

The MME according to the corresponding APN and PDU session identification of the PDU session, and obtained from UDM+HSS APN, Corresponding relationship between SMF+PGW-C and PDU session identification determines the first SMF+PGW-C；

The MME sends creation session request to the first SMF+PGW-C；

The MME receives the creation conversational response that the first SMF+PGW-C is returned；

The MME returns to PDN connection response to the UE according to the creation conversational response.

Optionally, the method also includes:

The MME receives the corresponding relationship between APN, SMF+PGW-C and PDU session identification that UDM+HSS is sent.

Tenth aspect, the application provide a kind of session transferring method, which comprises

MME receives the PDN connection request that UE is sent；The PDN connection request carries transfer instruction, the PDU session pair APN the and PDU session identification answered, the transfer instruction are used to indicate PDU Session Hand-off to 4G network；

The MME is according to the corresponding APN of the PDU session, from least one corresponding SMF+PGW-C of the APN, choosing Select the first SMF+PGW-C；

The MME sends creation session request to the first SMF+PGW-C；

If the MME receives the creation session rejection response that the first SMF+PGW-C is returned；The creation session is refused The reason of lost art answers middle carrying to be rejected, the MME is from least one corresponding SMF+PGW-C of the APN, and selection is except described The 2nd SMF+PGW-C initiates conversation establishing either one or two of except first SMF+PGW-C, repeats this step until completing conversation establishing Afterwards, the MME returns to PDN connection response to UE.

Tenth on the one hand, and the application provides a kind of session transferring method, the method also includes:

SMF+PGW-C receives the creation session request that MME is sent, and the creation session request carries transfer instruction, PDU meeting Words mark and APN；

The SMF+PGW-C detects whether that there are the corresponding PDU of the PDU session identification according to the PDU session identification Session；

If it is not, then returning to creation session rejection response, the original of the creation session rejection response instruction refusal to the MME Cause；

If so, completing creation session according to the creation session request, and creation conversational response is sent to the MME.

In above-mentioned each implementation, it should be appreciated that the address SMF+PGW-C includes the mark of SMF+PGW-C, alternatively, The fully qualified domain name (Fully Qualified Domain Name, FQDN) of SMF+PGW-C, alternatively, the IP of SMF+PGW-C Location.

12nd aspect, the application provide a kind of UE, and the UE includes:

Sending module, for sending first message to access and AMF, the first message is for establishing PDU session；Its In, the first message includes the request of PDU session establishment and precedence information, and the precedence information is for indicating that the UE is asked Ask the PDU Session Hand-off of foundation to the priority of 4G communication system；

Receiving module sends second message for receiving the AMF, and the second message receives comprising PDU session establishment.

Optionally, the UE further include:

Processing module, for determining the precedence information according to the combination of one or more of information:

The corresponding S-NSSAI of the PDU session；

Use the application of the PDU session；

The URSP that the UE is saved；

The qos parameter of the corresponding QoS flow of default quality of service QoS rule for the PDU session that the UE request is established.

Optionally, the second message further include: the precedence information for the PDU session that network determines.

Optionally, the UE further include: processing module, for being moved to 4G communication system from 5G communication system as the UE When, the first PDU meeting for being transferred to 4G communication system is determined according to the precedence information of the corresponding each PDU session of the DNN used Words.

Optionally, the processing module is specifically used for:

According to the corresponding precedence information of the corresponding each PDU session of the DNN, by the PDU meeting of wherein highest priority Words are determined as being transferred to the first PDU session of 4G communication system.

13rd aspect, the application provide a kind of AMF, and the AMF includes:

Sending module, for sending the first PDU session to MME when UE is moved to 4G communication system from 5G communication system The information of corresponding PDN connection, the information of the PDN connection are that the UE establishes PDN connection for the MME；

Optionally, the AMF further include: receiving module is used for:

During the first PDU session establishment, the precedence information that the UE is sent is received；Alternatively,

Receive the precedence information of the first PDU session of the first SMF+PGW-C transmission；

Optionally, the receiving module is specifically used for:

In EBI assigning process, the priority letter for the first PDU session that the first SMF+PGW-C is sent is received Breath.

Optionally, the AMF further include: processing module；

The receiving module is also used to receive the EBI distribution request that the first SMF+PGW-C is sent；

The processing module is specifically used for:

If it is determined that being that the corresponding 2nd PDU session of the first DNN is assigned with EBI, and the 2nd PDU session Corresponding 2nd SMF+PGW-C is different from the first SMF+PGW-C, then judges whether the priority of the first PDU session is high In the priority of the 2nd PDU session；

If the priority of the first PDU session is higher than the priority of the 2nd PDU session, for the first PDU Session distributes EBI；

Alternatively,

The processing module is specifically used for:

If it is determined that being that the corresponding 3rd PDU session of the first DNN is assigned with EBI, and the 3rd PDU session Corresponding first SMF+PGW-C, then distribute EBI for the first PDU session；

Alternatively,

The processing module is specifically used for:

Corresponding 2nd SMF+PGW-C of the first DNN has been saved if it is determined that local, and the described first SMF+PGW-C pairs The priority answered is higher than the corresponding priority of the 2nd SMF+PGW-C, then distributes EBI for the first PDU session；

Alternatively,

The processing module is specifically used for:

If it is determined that corresponding first SMF+PGW-C of the first DNN, then distribute EBI for the first PDU session.

Optionally, the EBI distribution request includes the mark of the first PDU session, and the processing module is also used to root Corresponding first DNN of the first PDU session is determined according to the mark of the first PDU session.

Optionally, the processing module is also used to:

The priority of the corresponding S-NSSAI of the SMF+PGW-C of preservation determines that the first SMF+PGW-C is corresponding preferential Grade priority corresponding with the 2nd SMF+PGW-C；

Alternatively,

Obtain the corresponding priority of each SMF+PGW-C.

Optionally, the sending module is also used to send the information of the corresponding PDN connection of the 4th PDU session to the MME, The 4th PDU session and the first PDU session use identical DNN and SMF+PGW-C.

Optionally, the AMF further include: processing module；

The processing module is used to obtain described the of highest priority in the corresponding multiple PDU sessions of the first DNN One PDU session；

The sending module is also used to request the first PDU to corresponding first SMF+PGW-C of the first PDU session The information of the corresponding PDN connection of session；

Alternatively,

The sending module is also used to request the first PDU to corresponding first SMF+PGW-C of the first PDU session The information of the corresponding PDN connection of session, and obtain the corresponding PDN connection of other PDU sessions for using the first DNN Information.

Optionally, the receiving module is specifically used for:

It is corresponding to receive the corresponding default quality of service rule of the first PDU session that the first SMF+PGW-C is sent Distribution keep priority ARP, or,

The priority for the corresponding S-NSSAI of the first PDU session that the first SMF+PGW-C is sent is received, or,

Receive and save the priority that the UE that the first SMF+PGW-C is sent is provided.

Optionally, the precedence information that the received UE of the receiving module is sent, comprising:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

Fourteenth aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes:

Processing module is communicated for during the PDU session establishment of UE, obtaining the PDU Session Hand-off of the UE to 4G The precedence information of system；

Sending module, for the precedence information to be sent to UDM+HSS or AMF.

Optionally, the also SMF+PGW-C includes: receiving module；

The precedence information, which is the PDU Session Hand-off that sends of the received UE of the receiving module, to be communicated to 4G The priority of system；

Alternatively,

The precedence information is the PDU session that the processing module is determined according to the S-NSSAI of the PDU session It is transferred to the priority of 4G communication system；

Alternatively,

The precedence information is the processing module according to the S-NSSAI and DNN of the PDU session determination PDU Session Hand-off to 4G communication system priority.

15th aspect, the application provide a kind of UDM+HSS, and the UDM+HSS includes:

Memory module, the address of DNN, SMF+PGW-C that the PDU session of the UE for preservation uses and the correspondence of priority Relationship；Wherein, priority is used to indicate the corresponding priority for being transferred to 4G communication system of the corresponding PDU session of SMF+PGW-C, Alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module, with according to the priority of preservation, not determining the UE the first SMF+ used in 4G communication system The address PGW-C；

Sending module, for sending the first address SMF+PGW-C and APN to MME；Wherein, the APN with it is described DNN is corresponding.

Optionally, the processing module is specifically used for:

It determines in the corresponding all SMF+PGW-C of the DNN, the address of the SMF+PGW-C of highest priority is as first The address SMF+PGW-C.

Optionally, the UDM+HSS further include: receiving module；

The receiving module is used to receive the address DNN, SMF+PGW-C and the priority of SMF+PGW-C transmission；

The processing module is also used to determine whether to save other corresponding SMF+PGW-C of the DNN and priority Between corresponding relationship；

It has been saved if so, the processing module is also used to judge whether the corresponding priority of the SMF+PGW-C is higher than The corresponding corresponding priority of other SMF+PGW-C of the DNN；

If so, the memory module saves the corresponding relationship of the SMF+PGW-C Yu the priority.

16th aspect, the application provide a kind of UDM+HSS, and the UDM+HSS includes:

Memory module, for saving the ground of APN, SMF+PGW-C used in the PDU Session Hand-off to 4G communication system of UE The corresponding relationship of location and priority；Wherein, priority is used to indicate that the corresponding PDU session of SMF+PGW-C is corresponding to be transferred to 4G The priority of communication system, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module determines the UE the first SMF+ used in 4G communication system for the priority according to preservation The address PGW-C；

Sending module, for sending the first address SMF+PGW-C and the first address SMF+PGW-C to MME Corresponding APN.

Optionally, the processing module is specifically used for being determined in the SMF+PGW-C saved according to the corresponding relationship, excellent The address of the first highest SMF+PGW-C of grade is as the first address SMF+PGW-C.

Optionally, institute UDM+HSS is stated further include:

Receiving module, for receiving the address APN, SMF+PGW-C and the priority of SMF+PGW-C transmission；

The processing module, for determining locally whether save other corresponding SMF+PGW- of the corresponding DNN of the APN Corresponding relationship between C and priority；

If so, processing module is also used to judge whether the corresponding priority of the SMF+PGW-C is higher than the institute saved State the corresponding priority of other corresponding described SMF+PGW-C of DNN；

If so, memory module saves the corresponding relationship of the SMF+PGW-C Yu the priority.

17th aspect, the application provide a kind of UE, and the UE includes:

Processing module, for obtaining and the first PDU when determining the first PDU Session Hand-off to 4G communication system Corresponding first APN of session；

Sending module establishes request for sending PDN connection to MME；The PDN connection, which is established in request, carries described the Corresponding first APN of one PDU session；

Receiving module, the PDN connection for receiving MME transmission, which is established, to be received, to establish the PDN connection.

Optionally, the processing module is specifically used for:

According to the corresponding relationship between the PDU session of preservation and APN, obtain corresponding with the first PDU session described First APN.

Alternatively,

Optionally, the receiving module is also used in the establishment process of the first PDU session, receives SMF+PGW-C First APN corresponding with the first PDU session sent；

The processing module is also used to obtain and saves the first PDU session and the first APN in the storage device Between corresponding relationship.

Optionally, the processing module is specifically used for:

First APN corresponding with the S-NSSAI and DNN of the first PDU is determined according to URSP；

Alternatively,

Generate first APN corresponding with the S-NSSAI and DNN of the first PDU.

Optionally, the receiving module is also used to receive corresponding with the first PDU session the of SMF+PGW-C transmission One APN-AMBR.

18th aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes:

Receiving module, for receiving the PDU session establishment request of UE transmission；

Processing module, for obtaining APN corresponding with the PDU session of UE request foundation；

Sending module, for sending the address of the APN Yu the SMF+PGW-C to UDM+HSS；

The sending module, which is also used to send PDU session establishment to the UE, to be received, and the foundation of the PDU session is completed Journey.

Optionally, the PDU session establishment request packet includes S-NSSAI and DNN, and the processing module is specifically used for:

Obtain APN corresponding with the S-NSSAI and DNN.

Optionally, the processing module is specifically used for:

According to the policy information of preservation, the APN corresponding with the S-NSSAI and DNN is obtained.

Alternatively,

According to the corresponding relationship of the S-NSSAI of preservation and DNN and APN, obtain corresponding with the S-NSSAI and DNN The APN.

Optionally, the PDU session establishment request packet includes the APN, and the processing module is also used to from the PDU session It establishes in request and obtains the APN.

It optionally, include the APN in the PDU session establishment receiving.

Optionally, the processing module is also used to obtain APN-AMBR corresponding with the APN.

Optionally, the sending module is also used to:

The APN-AMBR corresponding with the APN is sent to the UE；

And/or

The APN-AMBR corresponding with the APN is sent to the UDM+HSS.

Optionally, the processing module is specifically used for:

According to the session AMBR of the UE, APN-AMBR corresponding with the APN is obtained；

Alternatively,

APN-AMBR corresponding with the APN is obtained according to the signing information of the UE.

Optionally, the processing module is specifically used for:

It is added the session AMBR for using all PDU sessions of DNN corresponding with the APN to obtain the APN-AMBR.

Optionally, the sending module is also used to send the first information to UDM+HSS, and the first information is for described UDM+HSS determines the corresponding APN-AMBR of the APN.

Optionally, the first information includes:

The APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；

Alternatively,

The corresponding DNN of the PDU session；

Alternatively,

The corresponding APN of DNN corresponding with the PDU session.

19th aspect, the application provide a kind of UE, and the UE includes:

Sending module, for sending PDN connection request to MME when determination needs PDU session being moved to 4G from 5G； The PDN connection request carries the corresponding APN and PDU session identification of the PDU session；

Receiving module, the PDN connection response returned for receiving the MME.

20th aspect, the application provide a kind of MME, and the MME includes:

Receiving module, for receiving the PDN connection request of UE transmission；The PDN connection request carries the PDU session pair APN the and PDU session identification answered；

Processing module, for being obtained according to the corresponding APN and PDU session identification of the PDU session, and from UDM+HSS APN, SMF+PGW-C and PDU session identification between corresponding relationship, determine the first SMF+PGW-C；

Sending module, for sending creation session request to the first SMF+PGW-C；

The receiving module is also used to receive the creation conversational response that the first SMF+PGW-C is returned；

The sending module is also used to return to PDN connection response to the UE according to the creation conversational response.

Optionally, the receiving module is also used to receive APN, SMF+PGW-C and PDU session identification of UDM+HSS transmission Between corresponding relationship.

20th on the one hand, and the application provides a kind of MME, and the MME includes:

Receiving module, for receiving the PDN connection request of UE transmission；The PDN connection request carries transfer and indicates, is described The corresponding APN and PDU session identification of PDU session, the transfer instruction are used to indicate PDU Session Hand-off to 4G network；

Processing module is used for according to the corresponding APN of the PDU session, from least one corresponding SMF+PGW- of the APN In C, the first SMF+PGW-C is selected；

Sending module, for sending creation session request to the first SMF+PGW-C；

If the receiving module receives the creation session rejection response that the first SMF+PGW-C is returned；The creation Carry the reason of being rejected in session rejection response, the processing module is from least one corresponding SMF+PGW-C of the APN In, selection the 2nd SMF+PGW-C either one or two of in addition to the first SMF+PGW-C initiates conversation establishing, and it is straight to repeat this step To after completing conversation establishing, the MME returns to PDN connection response to UE.

22nd aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes:

Receiving module, the creation session request sent for receiving MME, the creation session request carrying transfer instruction, PDU session identification and APN；

Processing module, for detecting whether that there are the corresponding PDU of the PDU session identification according to the PDU session identification Session；

Sending module, if for processing module detect be it is no, to the MME return creation session rejection response, institute The reason of stating creation session rejection response instruction refusal；

The processing module is also used to if so, completing creation session according to the creation session request；

The sending module is also used to send creation conversational response to the MME.

23rd aspect, the application provide a kind of UE, and the UE includes: for sending the transmitter of message, for connecing Receive receiver, memory and the processor of message.

In the specific implementation of the UE:

Transmitter is used to send first message to access and AMF, and the first message is for establishing PDU session；Wherein, institute Stating first message includes the request of PDU session establishment and precedence information, and the precedence information is for indicating that the UE request is built Vertical PDU Session Hand-off to 4G communication system priority；

Receiver sends second message for receiving the AMF, and the second message receives comprising PDU session establishment.

Optionally, the UE further include:

Processor, for determining the precedence information according to the combination of one or more of information:

The corresponding S-NSSAI of the PDU session；

Use the application of the PDU session；

The URSP that the UE is saved；

Optionally, the UE further include: processor, for being moved to 4G communication system from 5G communication system as the UE When, the first PDU meeting for being transferred to 4G communication system is determined according to the precedence information of the corresponding each PDU session of the DNN used Words.

Optionally, the processor is specifically used for:

Twenty-fourth aspect, the application provide a kind of AMF, and the AMF includes: for sending the transmitter of message, being used for Receive receiver, memory and the processor of message.

In the specific implementation of the AMF:

Transmitter, for sending the first PDU session pair to MME when UE is moved to 4G communication system from 5G communication system The information for the PDN connection answered, the information of the PDN connection are that the UE establishes PDN connection for the MME；

Optionally, the AMF further include: receiver is used for:

Optionally, the receiver is specifically used for:

Optionally, the AMF further include: processor；

The receiver is also used to receive the EBI distribution request that the first SMF+PGW-C is sent；

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Optionally, the EBI distribution request includes the mark of the first PDU session, and the processor is also used to basis The mark of the first PDU session determines corresponding first DNN of the first PDU session.

Optionally, the processor is also used to:

Alternatively,

Obtain the corresponding priority of each SMF+PGW-C.

Optionally, the transmitter is also used to send the information of the corresponding PDN connection of the 4th PDU session, institute to the MME It states the 4th PDU session and the first PDU session and uses identical DNN and SMF+PGW-C.

Optionally, the AMF further include: processor；

The processor is for obtaining described first of highest priority in the corresponding multiple PDU sessions of the first DNN PDU session；

The transmitter is also used to request the first PDU meeting to corresponding first SMF+PGW-C of the first PDU session Talk about the information of the corresponding PDN connection；

Alternatively,

The transmitter is also used to request the first PDU meeting to corresponding first SMF+PGW-C of the first PDU session The information of the corresponding PDN connection is talked about, and obtains the letter of the corresponding PDN connection of other PDU sessions using the first DNN Breath.

Optionally, the receiver is specifically used for:

Optionally, the precedence information that the received UE of the receiver is sent, comprising:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

25th aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes: for sending message Transmitter, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

Processor, for during the PDU session establishment of UE, obtaining the PDU Session Hand-off of the UE to 4G communication system The precedence information of system；

Transmitter, for the precedence information to be sent to UDM+HSS or AMF.

Optionally, the also SMF+PGW-C includes: receiver；

The precedence information is the PDU Session Hand-off that sends of the received UE of the receiver to 4G communication system The priority of system；

Alternatively,

The precedence information is that the processor turns according to the PDU session that the S-NSSAI of the PDU session is determined Move to the priority of 4G communication system；

Alternatively,

The precedence information is the PDU that the processor is determined according to the S-NSSAI and DNN of the PDU session Session Hand-off to 4G communication system priority.

26th aspect, the application provide a kind of UDM+HSS, and the UDM+HSS includes: the transmission for sending message Device, the receiver for receiving message, memory and processor.

In the specific implementation of the UDM+HSS:

Memory, the address of DNN, SMF+PGW-C that the PDU session of the UE for preservation uses and the corresponding of priority are closed System；Wherein, priority is used to indicate the corresponding priority for being transferred to 4G communication system of the corresponding PDU session of SMF+PGW-C, or Person, the priority are used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processor, with according to the priority of preservation, not determining the UE the first SMF+ used in 4G communication system The address PGW-C；

Transmitter, for sending the first address SMF+PGW-C and APN to MME；Wherein, the APN with it is described DNN is corresponding.

Optionally, the processor is specifically used for:

Optionally, the UDM+HSS further include: receiver；

The receiver is used to receive the address DNN, SMF+PGW-C and the priority of SMF+PGW-C transmission；

The processor be also used to determine whether to save other corresponding SMF+PGW-C of the DNN and priority it Between corresponding relationship；

It has been saved if so, the processor is also used to judge whether the SMF+PGW-C corresponding priority is higher than The corresponding priority of other corresponding described SMF+PGW-C of the DNN；

If so, the memory saves the corresponding relationship of the SMF+PGW-C Yu the priority.

27th aspect, the application provide a kind of UDM+HSS, and the UDM+HSS includes: the transmission for sending message Device, the receiver for receiving message, memory and processor.

In the specific implementation of the UDM+HSS:

Memory, for saving the address of APN, SMF+PGW-C used in the PDU Session Hand-off to 4G communication system of UE With the corresponding relationship of priority；Wherein, priority is used to indicate the corresponding 4G that is transferred to of the corresponding PDU session of SMF+PGW-C and leads to The priority of letter system, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processor determines the UE the first SMF+ used in 4G communication system for the priority according to preservation The address PGW-C；

Transmitter, for sending the first address SMF+PGW-C and the first address pair SMF+PGW-C to MME The APN answered.

Optionally, the processor is specifically used for being determined in the SMF+PGW-C saved, preferentially according to the corresponding relationship The address of the highest SMF+PGW-C of grade is as the first address SMF+PGW-C.

Optionally, institute UDM+HSS is stated further include:

Receiver, for receiving the address APN, SMF+PGW-C and the priority of SMF+PGW-C transmission；

The processor, for determining locally whether save other corresponding SMF+PGW-C of the corresponding DNN of the APN And the corresponding relationship between priority；

If so, processor be also used to judge the corresponding priority of the SMF+PGW-C whether be higher than saved it is described The corresponding priority of other corresponding described SMF+PGW-C of DNN；

If so, memory saves the corresponding relationship of the SMF+PGW-C Yu the priority.

Twenty-eighth aspect, the application provide a kind of UE, and the UE includes: for sending the transmitter of message, for connecing Receive receiver, memory and the processor of message.

In the specific implementation of the UE:

Processor, for obtaining and the first PDU meeting when determining the first PDU Session Hand-off to 4G communication system Talk about corresponding first APN；

Transmitter establishes request for sending PDN connection to MME；The PDN connection establishes in request and carries described first Corresponding first APN of PDU session；

Receiver, the PDN connection for receiving MME transmission, which is established, to be received, to establish the PDN connection.

Optionally, the processor is specifically used for:

Alternatively,

Optionally, the receiver is also used in the establishment process of the first PDU session, receives SMF+PGW-C hair First APN corresponding with the first PDU session sent；

The processor be also used to obtain and save in the storage device the first PDU session and the first APN it Between corresponding relationship.

Optionally, the processor is specifically used for:

According to UE routing strategy URSP determination and the S-NSSAI and DNN corresponding described first of the first PDU APN；

Alternatively,

Generate first APN corresponding with the S-NSSAI and DNN of the first PDU.

Optionally, the receiver be also used to receive SMF+PGW-C transmission with the first PDU session corresponding first APN-AMBR。

29th aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes: for sending message Transmitter, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

Receiver, for receiving the PDU session establishment request of UE transmission；

Processor, for obtaining APN corresponding with the PDU session of UE request foundation；

Transmitter, for sending the address of the APN Yu the SMF+PGW-C to UDM+HSS；

The transmitter, which is also used to send PDU session establishment to the UE, to be received, and the foundation of the PDU session is completed Journey.

Optionally, the PDU session establishment request packet includes S-NSSAI and DNN, and the processor is specifically used for:

Obtain APN corresponding with the S-NSSAI and DNN.

Optionally, the processor is specifically used for:

Alternatively,

Optionally, the PDU session establishment request packet includes the APN, and the processor is also used to build from the PDU session The APN is obtained in vertical request.

It optionally, include the APN in the PDU session establishment receiving.

Optionally, the processor is also used to obtain APN-AMBR corresponding with the APN.

Optionally, the transmitter is also used to:

The APN-AMBR corresponding with the APN is sent to the UE；

And/or

The APN-AMBR corresponding with the APN is sent to the UDM+HSS.

Optionally, the processor is specifically used for:

Alternatively,

Optionally, the processor is specifically used for:

Optionally, the transmitter is also used to send the first information to UDM+HSS, and the first information is used for the UDM+ HSS determines the corresponding APN-AMBR of the APN.

Optionally, the first information includes:

The APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；

Alternatively,

The corresponding DNN of the PDU session；

Alternatively,

The corresponding APN of DNN corresponding with the PDU session.

30th aspect, the application provide a kind of UE, and the UE includes: for sending the transmitter of message, for receiving Receiver, memory and the processor of message.

In the specific implementation of the UE:

Transmitter, for sending PDN connection request to MME when determination needs PDU session being moved to 4G from 5G；Institute It states PDN connection request and carries the corresponding APN and PDU session identification of the PDU session；

Receiver, the PDN connection response returned for receiving the MME.

30th on the one hand, and the application provides a kind of MME, and the MME includes: for sending the transmitter of message, being used for Receive receiver, memory and the processor of message.

In the specific implementation of the MME:

Receiver, for receiving the PDN connection request of UE transmission；It is corresponding that the PDN connection request carries the PDU session APN and PDU session identification；

Processor is used for according to the corresponding APN and PDU session identification of the PDU session, and obtained from UDM+HSS Corresponding relationship between APN, SMF+PGW-C and PDU session identification determines the first SMF+PGW-C；

Transmitter, for sending creation session request to the first SMF+PGW-C；

The receiver is also used to receive the creation conversational response that the first SMF+PGW-C is returned；

The transmitter is also used to return to PDN connection response to the UE according to the creation conversational response.

Optionally, the receiver be also used to receive UDM+HSS transmission APN, SMF+PGW-C and PDU session identification it Between corresponding relationship.

32nd aspect, the application provide a kind of MME, and the MME includes: for sending the transmitter of message, being used for Receive receiver, memory and the processor of message.

In the specific implementation of the MME:

Receiver, for receiving the PDN connection request of UE transmission；The PDN connection request carries transfer and indicates, is described The corresponding APN and PDU session identification of PDU session, the transfer instruction are used to indicate PDU Session Hand-off to 4G network；

Processor is used for according to the corresponding APN of the PDU session, from least one corresponding SMF+PGW-C of the APN In, select the first SMF+PGW-C；

Transmitter, for sending creation session request to the first SMF+PGW-C；

If the receiver receives the creation session rejection response that the first SMF+PGW-C is returned；The creation meeting Words refuse to respond the reason of middle carrying is rejected, and the processor is from least one corresponding SMF+PGW-C of the APN, choosing It either one or two of selects in addition to the first SMF+PGW-C the 2nd SMF+PGW-C and initiates conversation establishing, repeat this step until completing After conversation establishing, the MME returns to PDN connection response to UE.

33rd aspect, the application provide a kind of SMF+PGW-C, and the SMF+PGW-C includes: for sending message Transmitter, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

Receiver, for receiving the creation session request of MME transmission, the creation session request carries transfer instruction, PDU Session identification and APN；

Processor, for detecting whether that there are the corresponding PDU meetings of the PDU session identification according to the PDU session identification Words；

Transmitter, if for processor detect be it is no, to the MME return creation session rejection response, the wound The reason of building session rejection response instruction refusal；

The processor is also used to if so, completing creation session according to the creation session request；

The transmitter is also used to send creation conversational response to the MME.

In above-mentioned UE or each network equipment in the specific implementation, the quantity of processor is at least one, for executing Memory storage executes instruction, i.e. computer program.Optionally, memory can also be integrated in inside processor.

34th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session establishing method that computer program provides for realizing any one of first aspect.

35th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of second aspect.

36th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session establishing method that computer program provides for realizing any one of third aspect.

37th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of fourth aspect.

38th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of the 5th aspect.

39th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of the 6th aspect.

40th aspect, the application provide a kind of storage medium, and the storage medium is for storing computer program, the meter The session establishing method that calculation machine program provides for realizing any one of the 7th aspect.

40th on the one hand, and the application provides a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of eighth aspect.

42nd aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of the 9th aspect.

43rd aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program The session transferring method that computer program provides for realizing any one of the tenth aspect.

44th aspect, the application provide a kind of storage medium, and the storage medium is described for storing computer program Computer program is for realizing the tenth session transferring method that on the one hand any one provides.

Session establishing method, session transferring method, equipment and storage medium provided by the present application, UE is in 5G communication system During carrying out PDU session establishment, it is preferential to 4G communication system that the PDU Session Hand-off that instruction UE request is established is sent to AMF The precedence information of grade, in subsequent need the PDU Session Hand-off of UE to 4G communication system, by AMF according to each PDU session Precedence information, determine and which PDU Session Hand-off to 4G communicated him, and carry out subsequent Session Hand-off process, in 4G system PDN connection is completed in system to establish.During realizing that UE is moved to 4G communication system from 5G communication system, the property of can choose transfer The purpose of PDU session.

Detailed description of the invention

Fig. 1 is the system architecture diagram of communication system provided by the embodiments of the present application；

Fig. 2 is a kind of structural schematic diagram of UE provided by the embodiments of the present application；

Fig. 3 is the flow diagram of session establishing method embodiment one provided by the embodiments of the present application；

Fig. 4 is the flow diagram of session transferring method embodiment one provided by the embodiments of the present application；

Fig. 5 is that the process of the session establishing method embodiment one provided by the embodiments of the present application for having N26 interface scene is illustrated Figure；

Fig. 6 is the process signal of the session transferring method embodiment one of no N26 interface scene provided by the embodiments of the present application Figure；

Fig. 7 is the flow diagram of session establishing method embodiment two provided by the embodiments of the present application；

Fig. 8 is the flow diagram of session establishing method embodiment three provided by the embodiments of the present application；

Fig. 9 is the flow diagram of session transferring method embodiment two provided by the embodiments of the present application；

Figure 10 is the flow diagram of one example of session establishing method provided by the embodiments of the present application and session transferring method；

Figure 11 is the process signal of session establishing method provided by the embodiments of the present application and another example of session transferring method Figure

Figure 12 is the flow diagram of session transferring method embodiment three provided by the embodiments of the present application；

Figure 13 is the flow diagram of session transferring method example IV provided by the embodiments of the present application；

Figure 14 is the flow diagram of session transferring method embodiment five provided by the embodiments of the present application；

Figure 15 is the process signal of session establishing method provided by the embodiments of the present application and session transferring method yet another embodiment Figure；

Figure 16 is the process signal of session establishing method provided by the embodiments of the present application and the another example of session transferring method Figure；

Figure 17 is the structural schematic diagram of UE embodiment one provided by the embodiments of the present application；

Figure 18 is the structural schematic diagram of AMF embodiment one provided by the embodiments of the present application；

Figure 19 is the structural schematic diagram of SMF+PGW-C embodiment one provided by the embodiments of the present application；

Figure 20 is the structural schematic diagram of UDM+HSS embodiment one provided by the embodiments of the present application；

Figure 21 is the structural schematic diagram of UDM+HSS embodiment two provided by the embodiments of the present application；

Figure 22 is the structural schematic diagram of UE embodiment two provided by the embodiments of the present application；

Figure 23 is the structural schematic diagram of SMF+PGW-C embodiment two provided by the embodiments of the present application；

Figure 24 is the structural schematic diagram of UE embodiment three provided by the embodiments of the present application；

Figure 25 is the structural schematic diagram of MME embodiment one provided by the embodiments of the present application；

Figure 26 is the structural schematic diagram of MME embodiment two provided by the embodiments of the present application；

Figure 27 is the structural schematic diagram of SMF+PGW-C embodiment three provided by the embodiments of the present application；

Figure 28 is the structural schematic diagram of UE example IV provided by the embodiments of the present application；

Figure 29 is the structural schematic diagram of AMF embodiment two provided by the embodiments of the present application；

Figure 30 is the structural schematic diagram of SMF+PGW-C example IV provided by the embodiments of the present application；

Figure 31 is the structural schematic diagram of UDM+HSS embodiment three provided by the embodiments of the present application；

Figure 32 is the structural schematic diagram of UDM+HSS example IV provided by the embodiments of the present application；

Figure 33 is the structural schematic diagram of UE embodiment five provided by the embodiments of the present application；

Figure 34 is the structural schematic diagram of SMF+PGW-C embodiment five provided by the embodiments of the present application；

Figure 35 is the structural schematic diagram of UE embodiment six provided by the embodiments of the present application；

Figure 36 is the structural schematic diagram of MME embodiment three provided by the embodiments of the present application；

Figure 37 is the structural schematic diagram of MME example IV provided by the embodiments of the present application；

Figure 38 is the structural schematic diagram of SMF+PGW-C embodiment six provided by the embodiments of the present application.

Specific embodiment

Before introducing the application, first to the invention relates to technical term explanation is introduced.

Protocol data network (Protocol Data Network, PDN) connection (Connection or Connectivity): in 4G communication system (also referred to as 4G communication network or 4G), the grouping system for the one group of evolution established on UE (Envolved Packet System, EPS) carries the combination of (Bearer), these EPS carry IP address having the same and Access point name (Access Point Name, APN), EPS carrying refer to the data transmission channel in 4G communication system.? UE and network side identify a PDN with APN by IP address and connect.

PDN connection context: the IP address used including the PDN connection, APN, PDN Gateway (PDN Gateway, PGW) Context (Context) information of address and each EPS carrying.

Default (Default) EPS carrying, which refers to, is establishing the EPS carrying established while PDN connection, default EPS bearing It is all not guarantee bit rate (non Guaranteed Bit Rate, non GBR).Dedicated (Dedicated) EPS carrying Refer to after PDN connection foundation, in order to meet holding for certain quality of service (Quality of Service, QoS) demand foundation It carries.It wherein, may include multiple dedicated EPS carryings and a default EPS bearing in a PDN connection.Dedicated EPS carrying can be with It is GBR EPS carrying, is also possible to Non GBR EPS carrying.

Protocol Data Unit (Protocol Data Unit, PDU) session (Session): 5G communication system (also referred to as 5G communication network or 5G) in, the combination for the one group of QoS flow (flow) established on UE, these QoS flows IP address having the same and Data network title (Data Network Name, DNN).QoS flow refers to the data transmission channel in 5G communication system.? UE and network side identify a PDU session by IP address and DNN.

PDU session is in deactivation status (deactive), is referred to as PDU session and is deactivated (deactivated) or the PDU session un-activation (not active), refer to that the PDU session has been established, but the PDU meeting User face (User Plane, the UP) connection of words is not present, and may be specifically the combination of the one or more in following operation: 1, UPF (User Plane Function, user plane functions) deletes or hangs up the information (example of respective base station side in N3 interface Such as the IP address of base station, Tunnel Identifier, port numbers etc., so that UPF can not be sent to base station after downlink data reaches UPF).2, base It stands and deletion or hangs up the corresponding radio resource of PDU session (radio resource in the application can be for carrying PDU session pair The running time-frequency resource of data is answered, or Data Radio Bearer (the Data Radio for carrying PDU session corresponding data Bearer, DRB) either these situations combination) and base station delete or hang up N3 interface in the side UPF information (such as The IP address of UPF, Tunnel Identifier, port numbers etc., so that upstream data can not be sent to UPF after reaching base station).3, UE is according to base Corresponding radio resource is deleted or is hung up in the configuration stood.N3 interface is the interface between UPF and base station

PDU session is in activated state (active), is referred to as PDU session and is activated, refer to the PDU session UE with User face between UPF, which connects, to be existed, the company including eat dishes without rice or wine connection and the N3 interface between base station and UPF between UE and base station It connects, when the PDU session in activated state has the arrival of uplink and downlink data, can be transmitted directly between UE and UPF.

PDU session context: the IP address used including the PDU session, DNN, the address SMF and UPF and each QoS The contextual information of stream.Wherein, a PDU session may include multiple QoS flows.Exist in PDU session in 5G communication system QoS flow corresponding with the dedicated EPS carrying in 4G communication system, and exist and the default EPS bearing pair in 4G communication system The QoS flow answered.Specifically, a dedicated EPS carrying can correspond to one or more QoS flow in PDU session, a default EPS carrying can also correspond to one or more QoS flow in PDU session.Optionally, default EPS bearing can be with default QoS It flows corresponding.Default QoS flow refers to the corresponding QoS flow of default QoS regular (rule).Optionally, a dedicated GBR EPS carrying with One or more GBR QoS flows are corresponding.

Fig. 1 is the system architecture diagram of communication system provided by the embodiments of the present application, is led to applied by embodiments herein The system architecture of letter system is as shown in Figure 1, the system architecture includes 5G communication system and 4G communication system.

Referring to Fig. 1, which includes UMTS Terrestrial radio access network (the Evolved UMTS of UE, evolution Terrestrial Radio Access Network, E-UERAN), i.e. the base station 4G, mobility management entity (Mobility Management Entity, MME), gateway (Serving Gateway, S-GW), user plane functions (User Plane Function, UPF) the user face (PDN Gateway-User plane, PGW-U) of+PDN Gateway, conversation management functional (Session Management Function, SMF)+PDN Gateway control plane (PDN Gateway-Control plane, PGW-C), policy control functions (policy control Function, PCF)+Policy and Charging Rules Function (Policy and Charging Rules Function, PCRF), home subscribed services device (Home Subscriber Server, HSS)+uniform data management (Unified Data Management, UDM), access and mobile management function to ps domain (Access and Mobility management Function, AMF) and 5G wireless access network (5G Radio Access Network, 5G-RAN).

Wherein, E-UTRAN is 4G side group station, and UE can access 4G communication system by the base station；5G-RAN is 5G side group It stands, UE can access 5G communication system by the base station, and 5G-RAN can be the base station after the further evolution of E-UTRAN, and UE can It can be with accessing the base station of 5G communication system or 5G-RAN by the base station dedicated for the base of UE access 5G communication system It stands.

MME is 4G equipment of the core network, is responsible for authenticating UE, authorizing, mobile management, session management；UE is 4G's The association EPS load identification (Linked EPS Bearer ID, LBI) of PDN connection is distributed by the equipment.

S-GW is 4G equipment of the core network (core network gateway), is responsible for the forwarding of data, downlink data storage etc..

UPF+PGW-U is the equipment of the core network that 4G and 5G is shared, i.e. 4G and 5G close the equipment of the core network set, including UPF and The function of PGW-U.Wherein, UPF is the user face equipment of 5G core net, provides the service of user face for the PDU session of UE, is operation Interface gateway between quotient's network and external network.PGW-U is the user face equipment of 4G core net, provides use for the PDN connection of UE The service of family face, is the interface gateway between carrier network and external network.UPF+PGW-U is also referred to as PGW-U+UPF, as long as It is that the equipment comprising UPF and PGW-U function is identical as this equipment.

SMF+PGW-C is the equipment of the core network that 4G and 5G is shared, i.e. 4G and 5G close the equipment of the core network set, including SMF and The function of PGW-C.Wherein, SMF is the control plane equipment of 5G core net, provides control plane service for the PDU session of UE；To 5G's PDU session is managed, and is managed to the QoS of 5G, and UE distribution IP address is responsible for, and is responsible for UE selection UPF.PGW-C is The control plane equipment of 4G core net provides the service of user face for the PDN connection of UE；It is responsible for UE distribution IP address, is established for UE EPS carrying.SMF+PGW-C is also referred to as PGW-C+SMF, as long as the equipment comprising SMF and PGW-C function with this equipment It is identical.

PCF+PCRF is the equipment of the core network that 4G and 5G is shared, i.e. 4G and 5G close the equipment of the core network set, including PCF and PCRF.Wherein, PCRF is 4G equipment of the core network, is responsible for generating the strategy that user establishes Deta bearer (Bearer).PCF is 5G core Heart net equipment, it is similar with PCRF function.PCF+PCRF is also referred to as PCRF+PCF, as long as including PCF and PCRF function Equipment is identical as this equipment.

UDM+HSS is the equipment of the core network that 4G and 5G is shared, i.e. 4G and 5G close the equipment of the core network set, including HSS and UDM.Wherein, HSS is 4G equipment of the core network, for saving the subscription data of user.SDM is 5G equipment of the core network, for saving The subscription data of user.UDM+HSS is also referred to as HSS+UDM, as long as the equipment comprising HSS and UDM function with originally set It is standby identical.

AMF is that 5G equipment of the core network is managed the mobility of user for authenticating, authorizing to user.

N26 interface is the interface between MME and AMF, and the interface is optional at present.When UE is moved between 4G and 5G, lead to The transmitting of UE context can be carried out by crossing N26 interface, when the PDN connection that UE is established in 4G network can be by seamless branches to 5G When network, MME is that UE selects 5G and 4G to close the network element SMF+PGW-C set, and seamless branches refer to that IP address is constant, alternatively, IP Location is constant and PGW-C is constant.In addition, the PDU session that UE is established in 5G network can also be transferred to 4G network, then guarantee UE IP address it is constant.It includes 2 kinds of situations that UE is mobile between 4G and 5G: UE passes through the side of switching (handover) under connected state Formula is moved；UE is moved by way of gravity treatment (reselecct or select) under Idle state.

It should be noted that the quantity of the corresponding SMF of UE may be one or more, i.e., there are multiple SMF to mention for UE simultaneously For service.

In 4G communication system, UE from non-3 GPP network into the scene of 3GPP Network Mobility, the specific solution of session connection Certainly scheme is as follows:

For UE when non-3 GPP network establishes PDN connection, non-3 GPP network sends the corresponding relationship of APN and PGW to HSS；

After UE is moved to 3GPP network, MME obtains pair of the APN and PGW of all non-3 gpp PDN connections on UE from HSS It should be related to.

UE send carry switching (handover) instruction connect with the PDN of APN establish request, MME according to APN and from The corresponding relationship of APN and PGW that HSS is obtained, and connect foundation with the handover PDN indicated to PGW transmission carrying APN and ask It asks

PGW selects a PDN connection to be shifted according to APN from the corresponding multiple PDN connections of the APN

In the program, UE can not determine the sequence of transfer, need to carry handover instruction and APN's by repeatedly sending PDN connection establishes request and achievees the purpose that all PDN connections of transfer.

It based on above-mentioned framework shown in FIG. 1, needs to know in 5G communication system, N26 interface is optional interface.Work as network When without N26 interface, UE is in such a way that request is established in the PDN connection that carries handover instruction similar with 4G by the PDU of 5G Session Hand-off guarantees IP continuity to 4G.

The scene that slice slice is introduced in 5G communication system, under the scene, in order to reach slice spacings from mesh , there is independent SMF+PGW-C in each slice.Data network title (Data Network Name, DNN) is 5G communication network The title used in network is corresponded with the APN of 4G.Identical DNN can be used in multiple network slices, therefore, one of UE DNN may correspond to multiple SMF+PGW-C.New demand is proposed in 5G simultaneously, for UE when 5G there are multiple PDU sessions, UE can Part PDU session is moved to 4G with selection.At present in 5G, PDU session id is sent to SMF+PGW-C by PCO using UE Mode informs SMF+PGW-C, and which PDU session this shifts to 4G.To achieve the purpose that UE is selectively transfer.MME is not locate Manage the content in the PCO.

However, when a DNN of UE corresponds to multiple SMF+PGW-C, MME can not be according to UE under no N26 interface scene The corresponding relationship of APN and SMF+PGW-C that the APN and HSS of offer are provided, determining UE, this wishes to turn on which SMF+PGW-C PDU session, therefore be unable to reach the selectively transfer purpose of UE.

Aggregate Maximum Bit Rate (Aggregate Maximum Bit Rate, AMBR) is for limiting all non on UE Guarantee the peak transfer rate of bit rate (Guaranteed Bit Rate, GBR) carrying bearer.Be divided into APN-AMBR and Two kinds of UE-AMBR.Wherein, the non GBR carrying that APN-AMBR is used to limit all PDN connections of each APN on UE can make Peak transfer rate, usual APN-AMBR are used in UE and PGW.UE-AMBR is that all PDN connections on UE (can be across More multiple APN) non GBR carry the peak transfer rate that is able to use, usual UE-AMBR is used on base station.

When UE establishes PDN connection in 4G communication system, MME will contract from UE in the APN AMBR that obtains be sent to PGW, PGW determine that UE can be used according to policy control and charging (Policy Control and Charging, PCC) strategy APN AMBR, and be sent to MME and saved, MME is further transmitted to UE.

MME obtains UE-AMBR after being added the corresponding APN AMBR of APN currently in use multiple on UE, the signing with UE UE-AMBR is compared, and is got the small value as UE-AMBR and is sent to base station.

However, UE is moved to 4G communication system from 5G communication system when a DNN of UE corresponds to multiple SMF+PGW-C When, there can be a case where APN corresponds to multiple PGW, the regulation of a PGW can only be corresponded to by having broken an APN as defined in 4G, And then it can not be controlled according to rate of the APN AMBR to UE.

Based on the above-mentioned network architecture shown in FIG. 1 and presently, there are the problem of, the embodiment of the present application provides a kind of session Method for building up, session transferring method, for realizing UE from 5G communication system be moved to 4G communication system during session establishment With the process of transfer.

Fig. 2 is a kind of structural schematic diagram of UE provided by the embodiments of the present application, in each embodiment of the application, Ying Li Solution, which can be mobile phone, tablet computer, laptop, Ultra-Mobile PC (Ultra-mobile Personal Computer, UMPC), net book, personal digital assistant (Personal Digital Assistant, PDA), The user equipmenies such as chip for cell phone (for example, modem modem chip), mobile station, wearable device.The embodiment of the present application with For UE to be illustrated for mobile phone, which includes: radio frequency (radio frequency, RF) circuit 210, memory 220, input The components such as unit 230, display unit 240, gravity sensor 250, voicefrequency circuit 260, processor 270 and power supply 280.Under Face combines Fig. 2 specifically to introduce each component parts of mobile phone:

RF circuit 210 can be used for receiving and sending messages or communication process in, signal sends and receivees, particularly, by base station After downlink information receives, handled to processor 270；In addition, the data of uplink are sent to base station.In general, RF circuit 210 includes But be not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier (Low Noise Amplifier, LNA), duplexer etc..In addition, RF circuit 210 can also be communicated with network and other equipment by wireless communication.

Memory 220 can be used for storing software program and module, and processor 270 is stored in memory 120 by operation Software program and module, thereby executing the various function application and data processing of mobile phone.Memory 220 can mainly include Storing program area and storage data area, wherein storing program area can application journey needed for storage program area, at least one function Sequence (for example, call function, video playback capability etc.) etc.；Storage data area, which can be stored, uses created data according to mobile phone (for example, phone directory, photograph album etc.) etc..In addition, memory 220 may include high-speed random access memory, it can also include non- Volatile memory, for example, at least a disk memory, flush memory device or other volatile solid-state parts.

Input unit 230 can be used for receiving the number or character information of input, and generate with the user setting of mobile phone with And the related key signals input of function control.Specifically, input unit 230 may include that touch panel 231 and other inputs are set Standby 232.Touch panel 231, also referred to as touch screen collect the touch operation of user on it or nearby (for example, user uses The operation of any suitable object or attachment such as finger, stylus on touch panel 231 or near touch panel 231), and root Corresponding attachment device is driven according to preset formula.Optionally, touch panel 231 may include touch detecting apparatus and touch Two parts of controller.Wherein, the touch orientation of touch detecting apparatus detection user, and touch operation bring signal is detected, Transmit a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into touching Point coordinate, then gives processor 270, and can receive order that processor 270 is sent and be executed.Furthermore, it is possible to using electricity The multiple types such as resistive, condenser type, infrared ray and surface acoustic wave realize touch panel 231.In addition to touch panel 231, input Unit 230 can also include other input equipments 232.Specifically, other input equipments 232 can include but is not limited to secondary or physical bond One of disk, function key (such as volume control button, power switch button etc.), trace ball, mouse, operating stick etc. are more Kind.

Display unit 240 can be used for showing information input by user or be supplied to user information and mobile phone it is various Menu.Display unit 240 may include display panel 241, optionally, can use liquid crystal display (Liquid Crystal Display, LCD), the forms such as Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) it is aobvious to configure Show panel 241.Further, touch panel 231 can cover display panel 241, when touch panel 231 detect it is on it or attached After close touch operation, processor 170 is sent to determine the type of touch event, is followed by subsequent processing device 270 according to touch event Type corresponding visual output is provided on display panel 241.Although in Fig. 2, touch panel 231 and display panel 241 It is the function that outputs and inputs of mobile phone to be realized as two independent components, but in some embodiments it is possible to will touch Panel 231 and display panel 241 are integrated and that realizes mobile phone output and input function.

Gravity sensor (Gravity Sensor) 350 can detecte mobile phone and add in all directions (generally three axis) The size of speed can detect that size and the direction of gravity when static, can be used to identify application (such as the horizontal/vertical screen of mobile phone posture Switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, tap) etc..Mobile phone can be with Including other sensors, such as optical sensor.Specifically, optical sensor may include ambient light sensor and close to optical sensor. Wherein, ambient light sensor can adjust the brightness of display panel 241 according to the light and shade of ambient light；It can be with close to optical sensor It has detected whether that object comes close to or in contact with mobile phone, display panel 241 and/or backlight can have been closed when mobile phone is moved in one's ear.Hand The other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor that machine can also configure, it is no longer superfluous herein It states.

Voicefrequency circuit 260, loudspeaker 261, microphone 262 can provide the audio interface between user and mobile phone.Audio-frequency electric Electric signal after the audio data received conversion can be transferred to loudspeaker 261, be converted to sound by loudspeaker 261 by road 260 Signal output；On the other hand, the voice signal of collection is converted to electric signal by microphone 262, is turned after being received by voicefrequency circuit 262 It is changed to audio data, then audio data is exported to RF circuit 210 to be sent to such as another mobile phone, or audio data is defeated Out to memory 220 to be further processed.

Processor 270 is the control centre of mobile phone, using the various pieces of various interfaces and connection whole mobile phone, is led to It crosses operation or executes the software program and/or module being stored in memory 220, and call and be stored in memory 220 Data execute the various functions and processing data of mobile phone, to carry out integral monitoring to mobile phone.Optionally, processor 270 can wrap Include one or more processing units；Preferably, processor 270 can integrate application processor and modem processor, wherein answer With the main processing operation system of processor, user interface and application program etc., modem processor mainly handles wireless communication. It is understood that above-mentioned modem processor can not also be integrated into processor 270.

Mobile phone further includes the power supply 280 (such as battery) powered to all parts, it is preferred that power supply can pass through power supply pipe Reason system and processor 270 are logically contiguous, to realize management charging, electric discharge and power managed by power-supply management system Etc. functions.

Although being not shown, mobile phone can also include WiFi module, bluetooth module etc., and details are not described herein.Art technology Personnel are appreciated that handset structure shown in Figure 2 does not constitute the restriction to mobile phone, may include more more or less than illustrating Component, perhaps combine certain components or different component layouts.

Fig. 3 is the flow diagram of session establishing method embodiment one provided by the embodiments of the present application, as shown in figure 3, should The specific steps of session establishing method include:

S101:UE sends first message to AMF, and first message is for establishing PDU session.

In this step, which includes that the request of PDU session establishment and precedence information, the precedence information are used for Indicate that the PDU session of UE current request foundation is transferred to the priority of 4G communication system from 5G communication system.Priority letter Breath can carry in the request of PDU session establishment, can also be except the request of PDU session establishment, with no restrictions to this this programme.

Optionally, it in the first message that UE is sent to AMF, can also carry: single network slice selection auxiliary information (Single Network Slice Selection Assistance Information, S-NSSAI), data network title (Data Network Name, DNN), PDU session id (Session identity), request type (Request type).

The first message specifically can be the NAS message that UE is sent to AMF, for example, UL NAS transport Message indicates that this establishes PDU session by setting initial for request type.

The request of PDU session establishment, which may be embodied in N1 session management container (N1 SM container), is sent to AMF.

According to the step it is found that UE needs before initiating PDU session establishment, precedence information is got, it is specific real In existing, UE can determine above-mentioned precedence information according to the combination of one or more kinds of information below: UE request is established The corresponding S-NSSAI of PDU session；Use the application of the PDU session；UE routing strategy (the UE that the UE is saved Route Selection Policy, URSP)；Default quality of service (the Quality of for the PDU session that the UE request is established Service, QoS) regular (rule) corresponding QoS flow qos parameter.

Optionally, the corresponding network slice of each S-NSSAI has a priority in UE, and UE can be according to the S-NSSAI Corresponding priority determines precedence information；Alternatively, the different corresponding different priority of application on UE, UE can be according to using The PDU session using corresponding priority, determine the precedence information.Specifically, UE can be according to the mark (ID) of application Or type (type) of application etc. determines the precedence information；Alternatively, saving each S-NSSAI in the URSP of UE and/or answering With corresponding priority (including the corresponding priority of S-NSSAI, using corresponding priority ,-NSSAI and application it is corresponding excellent Three kinds of situations of first grade), UE determines the precedence information according to URSP；Alternatively, UE is according in the PDU session, with default QoS The qos parameter of the associated QoS flow of rule, for example, 5QI, determines the precedence information.

" according to " mentioned in the application, it can be understood as " according at least to ", the i.e. condition in addition to the basis provided in text, It can also include other conditions, the application does not further limit.For example, being determined according to the corresponding priority of the S-NSSAI excellent First grade information is interpreted as determining precedence information according at least to the corresponding priority of the S-NSSAI, i.e., in addition to S-NSSAI may be used also To be determined according to other information.The basis of other parts, it is identical as the understanding, it repeats no more.

Here, PDU session is transferred to the priority of 4G communication system from 5G communication system, specifically it is to be understood that UE exists Under connected state, it is switched to 4G process from 5G, PDU session switches (handover) or shifts (tranfer or move) to the excellent of 4G First grade, the priority is it can be appreciated that switching priority (handover Priority) at this time；Alternatively, UE is under Idle state, During 5G mobile (move or transfer) to 4G, the priority of PDU Session Hand-off to 4G, the priority can also at this time To be interpreted as transfer priority (transfer Priority).Subsequent, PDU session is transferred to 4G communication system from 5G communication system The priority of system or PDU Session Hand-off to 4G communication system priority, it is identical as the understanding, repeat no more.

After AMF completes the foundation of PDU session according to the information received, PDU session establishment is returned to UE and is received (Accept), i.e. UE executes step S104.

S102:SMF+PGW-C obtains the PDU Session Hand-off of UE to 4G communication system during the PDU session establishment of UE Precedence information.

In this step, AMF selects suitable SMF+PGW-C, and should after the first message for receiving UE transmission PDU session establishment requests the SMF+PGW-C for being sent to selection.

SMF+PGW-C needs to obtain the priority of the PDU session of UE foundation during the PDU session establishment of the UE Information, the precedence information are used to indicate the priority when PDU Session Hand-off to 4G communication system；Alternatively, precedence information It is used to indicate the priority when PDU Session Hand-off to 4G communication system；Alternatively, precedence information is for making AMF or SMF+ PGW-C knows the priority when PDU Session Hand-off to 4G communication system；Alternatively, precedence information is for making AMF or SMF+ PGW-C determines the priority when PDU Session Hand-off to 4G communication system.

The concrete mode that SMF+PGW-C obtains the precedence information of the PDU session includes at least following several:

First way, the precedence information, which is the PDU Session Hand-off that sends of the received UE, to be communicated to 4G The priority of system.

The second way, the precedence information are that the SMF+PGW-C is determined according to the S-NSSAI of the PDU session The PDU Session Hand-off to 4G communication system priority；

The third mode, the precedence information are S-NSSAI and DNN of the SMF+PGW-C according to the PDU session The determining PDU Session Hand-off to 4G communication system priority；

4th kind of mode, the precedence information are the SMF+PGW-C according to the PDU session and default QoS The PDU Session Hand-off that the qos parameter of the associated QoS flow of rule determines to 4G communication system priority；

Fifth procedure, the precedence information are to receive the PDU Session Hand-off that AMF is sent to 4G communication system Priority, the precedence information are sent out after AMF receives the PDU Session Hand-off to the priority of 4G communication system that UE is sent Give the SMF+PGW-C, alternatively, the precedence information be AMF according to the S-NSSAI or S-NSSAI of the PDU session and DNN determine the PDU Session Hand-off to 4G communication system priority.

Precedence information is sent to UDM+HSS or AMF by S103:SMF+PGW-C.

In this step, SMF+PGW-C, can be by the preferential of PDU session after the precedence information for getting PDU session Grade information is sent to UDM+HSS and is saved, or is sent to AMF.

S104:UE receives AMF and sends second message, and second message receives comprising PDU session establishment.

The second message specifically can be the NAS message that AMF is sent to UE, for example, DL NAS transport message。

In this step, AMF is returned after PDU session establishment is completed in the PDU session establishment request sent according to UE to UE Second message is returned, the receiving of PDU session establishment has been included at least in the second message, for notifying UE PDU session establishment to complete.

The PDU meeting that network side determines can also be carried in a kind of optional embodiment of the program, in second message The precedence information of words.Optionally, which can be what AMF or SMF+PGW-C was determined.

Session establishing method provided in this embodiment, UE send the request of PDU session establishment, AMF selection to the AMF of network side The SMF+PGW-C set is closed, the establishment process of PDU session is completed, and return to PDU session establishment to UE and receive, completes PDU session and build Vertical process.

In each embodiment of the application, it should be appreciated that UE is moved to 4G communication system from 5G communication system, specifically can be with It is interpreted as, when UE is in the overlapping coverage areas of 5G and 4G, UE disconnects the connection with 5G, accesses the process of 4G.Specifically, can be by Reason is covered in signal, UE loses 5G covering, into 4G；It needs to enter 4G alternatively, UE is determined according to local policy.UE is moved from 5G Move 4G and be specifically segmented into two kinds of situations: UE enters 4G from 5G by way of switching (handover) under connected state；UE Under Idle state, from 5G gravity treatment (select or reselect) to 4G.

Fig. 4 is the flow diagram of session transferring method embodiment one provided by the embodiments of the present application, as shown in figure 4, On the basis of above-mentioned embodiment illustrated in fig. 3, after completing PDU session establishment process, UE is moved to 4G communication from 5G communication system When system, need to carry out the transfer of PDU session, the specific steps of session transferring method provided in this embodiment include:

S201: when UE is moved to 4G communication system from 5G communication system, AMF is corresponding to MME the first PDU session of transmission The information of PDN connection.

In this scenario, when AMF detects that UE is moved to 4G communication system from 5G communication system, determine UE's by AMF The first PDU session shifted in PDU session.First PDU session is the multiple PDU meetings for the first DNN of use that UE is established In words, it is transferred to the PDU session of the highest priority of 4G communication system.Specifically, AMF can be corresponding multiple according to the DNN The precedence information of PDU session determines the first PDU session.AMF detects that UE is moved to 4G communication system from 5G communication system System includes 2 kinds of situations: UE is under connected state, and AMF receives the request for being switched to 4G of 5G RAN transmission, and AMF is according to the request Detect that UE is moved to 4G communication system from 5G communication system；Alternatively, UE is under Idle state, to MME initiating updating of tracking area (Tracking Area Update, TAU) request, MME send UE context (Context) request to AMF during TAU and disappear Breath, AMF are moved to 4G communication system from 5G communication system according to the request detection to UE

Here, using the PDU session of the first DNN, it can be understood as, in establishing the PDU conversation procedure, UE carries this First DNN, to complete the establishment process of the PDU session；Alternatively, in establishing the PDU conversation procedure, network side entity (AMF Or SMF+PGW-C) it is that UE has selected the first DNN, to complete the establishment process of the PDU session.

Therefore, which needs to get in advance using the precedence information of multiple PDU sessions of the DNN on UE, specifically It can be obtained by following methods:

First way, by taking the first PDU session as an example, during the first PDU session establishment, described in the AMF reception The precedence information that UE is sent.

It, i.e., can be by precedence information during carrying out PDU session establishment in 5G communication system in UE in the program Be sent to AMF, the precedence information can carry in the request of PDU session establishment or carry the request of PDU session establishment it is outer with The request of PDU session establishment is sent using the same message, is also possible to be individually sent to AMF, not done to this this programme Limitation.

The precedence information that the UE is sent includes at least: the priority of the corresponding S-NSSAI of the PDU session；Alternatively, institute State the priority of PDU session corresponding S-NSSAI and DNN；Alternatively, the priority of the application using the PDU session；Alternatively, The qos parameter with the default associated QoS flow of QoS rule of the PDU session.The corresponding network slice of each S-NSSAI in UE There is a priority, UE can carry the corresponding priority of the S-NSSAI；Alternatively, each S-NSSAI and DNN has one in UE Priority, UE can carry the corresponding priority of the S-NSSAI and DNN；Alternatively, different application is corresponding different preferential on UE Grade, UE can be according to carrying using the PDU session using corresponding priority.Specifically, UE can be according to the mark of application (ID) or the type (type) etc. of application determines the priority；Alternatively, being associated with according in the PDU session with default QoS rule QoS flow qos parameter, for example, 5QI, determines the priority.

The second way, by taking the first PDU session as an example, AMF receives the first PDU meeting that the first SMF+PGW-C is sent The precedence information of words.

In the program, for each PDU session, AMF can receive the corresponding SMF+PGW-C hair of each PDU session respectively The precedence information for the PDU session sent.The precedence information can specifically include following several realizations: described in the AMF is received The corresponding distribution of the corresponding default quality of service rule of the first PDU session that first SMF+PGW-C is sent keeps priority (Allocation and Retention Priority, ARP).

Alternatively, the AMF receives the corresponding S-NSSAI's of the first PDU session that the first SMF+PGW-C is sent Priority.

Alternatively, the AMF receives and saves the priority that the UE that the first SMF+PGW-C is sent is provided.

In the specific implementation, by taking the first PDU session as an example, AMF can be received one kind of the program in EBI assigning process The precedence information for the first PDU session that first SMF+PGW-C is sent；Alternatively, AMF is in EBI assigning process, the is received The information for the priority for determining the first PDU session that one SMF+PGW-C is sent.

Optionally, in this process, AMF can determine that the first PDU session is corresponding according to the mark of the first PDU session First DNN.

Optionally, for determining the information of the priority of the first PDU session, it specifically can be the first PDU session Mark, AMF determine the corresponding precedence information of the first PDU session according to the mark of the first PDU session.Specifically, AMF is protected The PDU session identification of each PDU session deposited is corresponding between the priority for being transferred to 4G communication system of the PDU session to close System, AMF determine the precedence information according to the corresponding relationship and the first PDU session identification.

Specifically, EBI assigning process specifically includes following several implementations:

(1), AMF receives the EBI distribution request that the first SMF+PGW-C is sent；If the AMF determines to be The corresponding 2nd PDU session of one DNN is assigned with EBI, and corresponding 2nd SMF+PGW-C of the 2nd PDU session and described first SMF+PGW-C is different, then judges whether the priority of the first PDU session is higher than the priority of the 2nd PDU session.If The priority of the first PDU session is higher than the priority of the 2nd PDU session, then the AMF is the first PDU session Distribute EBI.

Optionally, AMF further initiates to delete the process of the corresponding EBI of the 2nd PDU session.

Optionally, when AMF judges that the priority of the first PDU session is lower than the priority of the 2nd PDU session, then institute Stating AMF not is the first PDU session distribution EBI, while carrying Reason For Denial, and the Reason For Denial is for making the first SMF+PGW Know that the PDU session that AMF has been higher priority is assigned with EBI.

In this scenario, similarly by taking the first PDU session as an example, AMF is receiving the first PDU session corresponding first After the EBI distribution request that SMF+PGW-C is sent, need to determine whether to be the first PDU according to the content being locally stored The DNN of session, that is, the corresponding others PDU session of above-mentioned first DNN are assigned with EBI, the 2nd PDU meeting as escribed above Words.If being that the 2nd PDU session is assigned with EBI, it needs to be determined that corresponding first SMF+PGW-C of the first PDU session Whether twoth SMF+PGW-C corresponding with the 2nd PDU session is the same SMF+PGW-C, if it is not, then needing according to two The priority of PDU session decides whether to distribute EBI for the first PDU session, specifically, the priority when the first PDU session is higher than The priority of the 2nd PDU session, then the AMF is that the first PDU session distributes EBI, and otherwise AMF is not the first PDU Session distributes EBI, then the first PDU session can not be shifted.

Optionally, when AMF judges that the priority of the first PDU session is lower than the priority of the 2nd PDU session, then institute Stating AMF not is the first PDU session distribution EBI, while carrying Reason For Denial, and the Reason For Denial is for making the first SMF+PGW Know that the PDU session that AMF has been higher priority is assigned with EBI.In each embodiment of the application, it should be appreciated that first Corresponding first SMF+PGW-C of PDU session is it is to be understood that the first SMF+PGW-C provides service for the first PDU session.Alternatively, the One PDU session uses the first SMF+PGW-C.Alternatively, AMF is the first PDU session selection during the first PDU session establishment First SMF+PGW-C.Alternatively, the first SMF+PGW-C is that the first PDU session distributes IP address.

Likewise, corresponding 2nd SMF+PGW-C of the 2nd PDU session is it is to be understood that the 2nd SMF+PGW-C is the 2nd PDU Session provides service.Alternatively, the 2nd PDU session uses the 2nd SMF+PGW-C.Alternatively, during the 2nd PDU session establishment, AMF is that the 2nd PDU session has selected the 2nd SMF+PGW-C.Alternatively, the 2nd SMF+PGW-C is for the 2nd PDU session distribution IP Location.

(2), AMF receives the EBI distribution request that the first SMF+PGW-C is sent；If the AMF is determined as institute It states the corresponding 3rd PDU session of the first DNN and is assigned with EBI, and the 3rd PDU session corresponds to the first SMF+PGW-C, then The AMF is that the first PDU session distributes EBI.

In this scenario, AMF receives the EBI distribution request that the first SMF+PGW-C is sent, and specifically can be, SMF+PGW-C The service for calling (invoke) AMF to provide, for example, AMF communication EBI distributes (Namf_Communication_ EBIAssignment request), alternatively, SMF+PGW-C initiates EBI distribution request to AMF.

AMF needs root after receiving the EBI distribution request that corresponding first SMF+PGW-C of the first PDU session is sent According to the content being locally stored, determine whether be the first PDU session DNN, that is, above-mentioned first DNN it is corresponding its His PDU session is assigned with EBI, the 3rd PDU session as escribed above.If being that the 3rd PDU session is assigned with EBI, It needs to be determined that the 3rd PDU session same SMF+PGW-C whether corresponding with the first PDU session, that is, determine the 3rd PDU session Whether the first SMF+PGW-C is also corresponded to, if it is, directly EBI is distributed for the first PDU session, so that subsequent continue to execute Session Hand-off process.

(3), AMF receives the EBI distribution request that the first SMF+PGW-C is sent；If the AMF determines local protected Corresponding 2nd SMF+PGW-C of the first DNN is deposited, and the corresponding priority of the first SMF+PGW-C is higher than the 2nd SMF The corresponding priority of+PGW-C, then the AMF is that the first PDU session distributes EBI.

In this scenario, AMF is asked in the EBI distribution for receiving the corresponding first SMF+PGW-C transmission of the first PDU session After asking, need to determine whether the DNN for having saved the first PDU session, that is, above-mentioned according to the content being locally stored First DNN corresponding others SMF+PGW-C, i.e., the 2nd above-mentioned SMF+PGW-C.If so, needing according to the first SMF+ The priority of PGW-C and the 2nd SMF+PGW-C, it is determined whether EBI is distributed for the first PDU session, only in the first SMF+PGW-C When corresponding priority is higher than the 2nd SMF+PGW-C corresponding priority, AMF is that the first PDU session distributes EBI.Otherwise AMF is not EBI is distributed for the first PDU session, then the first PDU session can not be shifted.

(4), AMF receives the EBI distribution request that the first SMF+PGW-C is sent；If the AMF determines described first DNN corresponds to the first SMF+PGW-C, then the AMF is that the first PDU session distributes EBI.

In this scenario, AMF is asked in the EBI distribution for receiving the corresponding first SMF+PGW-C transmission of the first PDU session After asking, need to determine whether the DNN for having saved the first PDU session, that is, above-mentioned according to the content being locally stored First DNN corresponding others SMF+PGW-C, i.e., the 2nd above-mentioned SMF+PGW-C.If it is not, then AMF is directly described first PDU session distributes EBI.

Above-mentioned several schemes in the specific implementation, AMF can according to the corresponding S-NSSAI of SMF+PGW-C of preservation or The priority of slice or slice example (instance), determines the corresponding priority of the first SMF+PGW-C and described second The corresponding priority of SMF+PGW-C.Alternatively, the AMF obtains the corresponding priority of each SMF+PGW-C.In actually arranging net, no Same slice can correspond to different priority, for example, the priority of government's slice is higher than the priority of enterprise's slice, AMF can To determine the priority for being sliced interior SMF+PGW-C according to different slices.AMF can also save the preferential of each SMF+PGW-C Grade.

To which AMF can determine the priority of SMF+PGW-C.After AMF determines the first PDU session to be shifted, AMF needs to obtain the information of the corresponding PDN connection in 4G communication system of the first PDU session, and is sent to MME.It is specific real In existing, which obtains the first PDU session of highest priority in the corresponding multiple PDU sessions of the first DNN, i.e., and determining pair First PDU session is shifted, and then AMF requests the first PDU session to corresponding first SMF+PGW-C of the first PDU session The information of corresponding PDN connection.Then the information of the corresponding PDN connection of the first obtained PDU session MME is sent to carry out PDN connection.PDU session corresponds to PDN connection, it can be understood as, PDU session is connect with PDN uses identical IP address；Alternatively, PDU session connect IP address having the same and SMF+PGW-C with PDN；Alternatively, PDU session connect IP having the same with PDN Address and SMF+PGW-C and UPF+PGW-U.

Alternatively,

AMF requests the first PDU session corresponding described to corresponding first SMF+PGW-C of the first PDU session The information of PDN connection, and obtain the information of the corresponding PDN connection of other PDU sessions using the first DNN.It is meant that AMF before the information for requesting the corresponding PDN connection of the first PDU session to the first SMF+PGW-C, simultaneously or after, may be used also To request the corresponding others corresponding SMF+PGW-C of PDU session of the first DNN to the first SMF+PGW-C, others PDU is requested The information of the corresponding PDN connection of session.

The program one kind in the specific implementation, letter of the AMF in addition to sending the corresponding PDN connection of the first PDU session to MME Breath can also send and be connect with the first PDU session using the PDN of the 4th PDU session of identical DNN and SMF+PGW-C Information, the 4th PDU session can be one or more here.After MME obtains the corresponding PDN connection of the 4th PDU session, it can incite somebody to action Use the PDU Session Hand-off of identical DNN and SMF+PGW-C to 4G with the first PDU.

S202:MME is that UE establishes PDN company in 4G communication system according to the information of the corresponding PDN connection of the first PDU session It connects.

In this step, MME is after receiving the information of the corresponding PDN connection of the first PDU session of AMF transmission, institute Stating MME is that UE selects gateway Serving GW, and sends creation session request Create Session to Serving GW Request, to establish PDN connection for UE.

Which in above scheme, by MME according to the precedence information of PDU session, determine the PDU Session Hand-off of UE to 4G Communication system, and in the scheme of Session Hand-off, which PDU session can also be UE oneself shifts to determine, specifically , when the UE is moved to 4G communication system from 5G communication system, the UE is according to DNN (the namely above scheme used In the first DNN) precedence information of corresponding each PDU session determines the first PDU session for being transferred to 4G communication system.One Kind in the specific implementation, may is that UE, will be wherein preferential according to the corresponding precedence information of the corresponding each PDU session of the DNN The highest PDU session of grade is determined as being transferred to the first PDU session of 4G communication system.

Specifically, UE can enable the corresponding context of PDN connection after entering 4G system；Alternatively, UE active is in 4G It initiates PDN connection and establishes request, so that the PDN connection will be established.

In session transferring method provided by the above embodiment, during UE carries out PDU session establishment in 5G communication system, The precedence information for indicating that UE requests the PDU Session Hand-off established to the priority of 4G communication system is sent to AMF, in subsequent need When by the PDU Session Hand-off of UE to 4G communication system, perhaps MME or allow UE oneself according to each PDU session by AMF Precedence information determines which PDU Session Hand-off to 4G communication system, and carries out subsequent Session Hand-off process, in 4G system It completes PDN connection in system to establish, during realizing that UE is moved to 4G communication system from 5G communication system, the property of can choose is shifted The purpose of PDU session.

On the basis of the above embodiments, during PDU session establishment, UDM+HSS can save the PDU session of UE The address of DNN, SMF+PGW-C for using and the corresponding relationship of priority；Wherein, priority is for indicating that SMF+PGW-C is corresponding The corresponding priority for being transferred to 4G communication system of PDU session, alternatively, the priority for indicate SMF+PGW-C shift To the priority of 4G communication system.During PDU Session Hand-off is to 4G communication system, UDM+HSS is according to the preferential of preservation Grade, determines the first address SMF+PGW-C used in 4G communication system the UE, and then UDM+HSS is determined to MME transmission The first address SMF+PGW-C and APN, the APN and UE the DNN that uses of PDU session it is corresponding.MME receives APN and After one address SMF+PGW-C, it is that UE establishes PDN connection according to the APN and the first address SMF+PGW-C, completes PDU session It is transferred to 4G communication system.SMF+PGW-C is transferred to the priority of 4G communication system it can be appreciated that SMF+PGW-C is corresponding It is transferred to the priority of 4G communication system, can be the corresponding all PDU Session Hand-offs of the SMF+PGW-C to 4G communication system Priority, alternatively, being transferred to the priority of the highest priority of 4G communication system in the corresponding all PDU sessions of SMF+PGW-C.

The address of SMF+PGW-C specifically may is that the mark of SMF+PGW-C, alternatively, the FQDN (Fully of SMF+PGW-C Qualified Domain Name, fully qualified domain name), alternatively, the IP address of SMF+PGW-C.

In this process, the corresponding multiple PDU sessions of DNN can be saved in a kind of specific implementation, in UDM+HSS The address of SMF+PGW-C and the corresponding relationship of priority, therefore during determining the first address SMF+PGW-C, UDM+HSS It determines in the corresponding all SMF+PGW-C of the DNN, the address of the SMF+PGW-C of highest priority is as the first SMF+PGW-C Address.

In another specific implementation, a PDU session corresponding DNN, SMF+ can be only saved in UDM+HSS The address of PGW-C and the corresponding relationship of priority, specifically save process are as follows: the DNN of UDM+HSS reception SMF+PGW-C transmission, The address SMF+PGW-C and priority, the UDM+HSS determine whether to save other corresponding SMF+PGW-C of the DNN with And the corresponding relationship between priority.

If so, the UDM+HSS judge the corresponding priority of the SMF+PGW-C whether be higher than saved it is described The corresponding priority of other corresponding described SMF+PGW-C of DNN, if so, UDM+HSS saves the address of the SMF+PGW-C With the corresponding relationship of the priority.

The program is meant that, the address of the SMF+PGW-C of highest priority and pair of priority are only saved in UDM+HSS It should be related to.

The corresponding relationship of above-mentioned DNN, SMF+PGW-C and priority, comprising: APN, SMF+PGW-C corresponding with DNN and The corresponding relationship of priority；Alternatively, the corresponding relationship of DNN, S-NSSAI, SMF+PGW-C and priority；Alternatively, corresponding with DNN APN, S-NSSAI, SMF+PGW-C and priority corresponding relationship；Alternatively, PDU session identification, SMF+PGW-C and priority Corresponding relationship.

Optionally, during PDU session establishment, UDM+HSS can save the PDU Session Hand-off of UE to 4G communication system The address of APN, SMF+PGW-C used in system and the corresponding relationship of priority；Wherein, priority is used to indicate SMF+PGW-C The corresponding priority for being transferred to 4G communication system of corresponding PDU session, alternatively, the priority is used to indicate SMF+PGW-C It is transferred to the priority of 4G communication system.During PDU Session Hand-off is to 4G communication system, UDM+HSS is according to preservation Priority determines the first address SMF+PGW-C used in 4G communication system the UE, and then UDM+HSS sends institute to MME State the first address SMF+PGW-C and the corresponding APN in the first address SMF+PGW-C.The PDU session of the APN and UE uses DNN it is corresponding.After MME receives APN and the first address SMF+PGW-C, according to the APN and the first SMF+PGW-C Location is that UE establishes PDN connection, completes PDU Session Hand-off to 4G communication system.

The SMF+PGW-C of multiple PDU sessions can be saved in a kind of specific implementation of the program, in UDM+HSS Address and priority corresponding relationship, therefore during determining the first address SMF+PGW-C, UDM+HSS is according to Corresponding relationship determines in the SMF+PGW-C saved that the address of the SMF+PGW-C of highest priority is as the first SMF+PGW-C Location.

In another specific implementation, a PDU session corresponding APN, SMF+ can be only saved in UDM+HSS The address of PGW-C and the corresponding relationship of priority, during specific preservation, the APN of UDM+HSS reception SMF+PGW-C transmission, The address SMF+PGW-C and priority, the UDM+HSS determine it is local whether save the corresponding DNN of the APN it is corresponding its Corresponding relationship between his SMF+PGW-C and priority.If so, the UDM+HSS judges that the SMF+PGW-C is corresponding Whether priority is higher than the corresponding priority of other corresponding described SMF+PGW-C of the DNN saved, if so, UDM+ HSS saves the corresponding relationship of the SMF+PGW-C Yu the priority.

The program is meant that pair of address and priority that the SMF+PGW-C of highest priority is only saved in UDM+HSS It should be related to.

The corresponding relationship of above-mentioned APN, SMF+PGW-C and priority, comprising: APN, SMF+PGW-C corresponding with DNN and The corresponding relationship of priority；Alternatively, the corresponding relationship of DNN, S-NSSAI, SMF+PGW-C and priority；Alternatively, corresponding with DNN APN, S-NSSAI, SMF+PGW-C and priority corresponding relationship；Alternatively, PDU session identification, SMF+PGW-C and priority Corresponding relationship.

Based on each embodiment it is found that the main thought of above-mentioned solution is: still maintenance DNN and APN reflect one by one The limitation penetrated, but only the PDU session of the corresponding slice of transfer DNN specifically includes following two into 4G communication system Kind scene:

There is N26 scene: judging that the PDU session of which network slice can be transferred to 4G communication system by AMF.In the scene Under Session Hand-off during:

When-SMF+PGW-C requests distribution EBI to AMF, AMF determines which PD session can be transferred to 4G according to priority.

For that cannot be transferred to the PDU session of 4G, AMF does not distribute the EBI or allocated EBI of recycling

It is specific, AMF according to priority are as follows:

The priority for the S-NSSAI that AMF is locally saved, alternatively,

Priority from SMF+PGW-C to the AMF S-NSSAI provided, alternatively,

SMF+PGW-C provides the corresponding ARP of the corresponding default QoS rule of PDU session to AMF,

Above-mentioned SMF+PGW-C can be UE to the information that AMF is provided and be supplied to SMF's.

No N26 scene: UDM+HSS judges that the PDU session of which slice can be transferred to 4G communication system, under the scene Session Hand-off during:

When the information that-SMF+PGW-C is saved to offer UDM+HSS, while providing precedence information, comprising:

UDM+HSS only saves the corresponding relationship that can be transferred to the APN and SMF+PGW-C of 4G；Alternatively, UDM+HSS is saved The corresponding relationship of APN, SMF+PGW-C and priority.

Specifically, UDM+HSS saves the corresponding relationship with DNN, SMF+PGW-C and priority, comprising:

UDM+HSS saves the corresponding relationship of APN, SMF+PGW-C and priority corresponding with DNN；Alternatively,

The corresponding relationship of UDM+HSS preservation DNN, S-NSSAI, SMF+PGW-C and priority；Alternatively,

UDM+HSS saves the corresponding relationship of APN, S-NSSAI, SMF+PGW-C and priority corresponding with DNN；Alternatively,

UDM+HSS saves the corresponding relationship of PDU session ID, SMF+PGW-C and priority.

Optionally, UDM+HSS saves the corresponding relationship with APN, SMF+PGW-C and priority, comprising:

Specific, the priority that SMF is provided to UMD+HSS is that the corresponding default QoS rule of the PDU session is corresponding ARP, or, the priority of the SMF is provided from UE, or, the priority etc. of S-NSSAI.

Based on above-mentioned thinking, the session establishing method that the first solution is provided below by two specific examples It is illustrated with session transferring method.

Fig. 5 is that the process of the session establishing method embodiment one provided by the embodiments of the present application for having N26 interface scene is illustrated Figure, as shown in figure 5, the session establishing method specifically includes the following steps:

S301:UE sends the request of PDU session establishment to AMF.

In this step, UE initiates the request of PDU session establishment in 5G communication system, optionally, carries the PDU session The priority or the corresponding S-NSSAI of the PDU session for being transferred to 4G communication system are transferred to use in the priority or UE of 4G and be somebody's turn to do The priority of the application of PDU session.

S302:AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU meeting to the SMF+PGW-C selected Words creation SM context request.It is requested in the request comprising PDU session establishment.

In the step, AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU session wound to SMF+PGW-C SM context request is built, carries PDU session identification, S-NSSAI and DNN in the request, optionally, is carried excellent in step S301 First grade.

S303:SMF+PGW-C requests the corresponding signing information of DNN to UDM+HSS.Step S303 is optional step.

S304:SMF+PGW-C determines that the PDU session can be transferred to 4G, then requests distribution EBI to AMF.

In this step, SMF+PGW-C determines that the PDU session can be transferred to 4G communication system, then to AMF request point With EBI, optionally, precedence information can be carried in EBI distribution request.

The precedence information can be the priority that UE in S301 is carried to SMF+PGW-C.Alternatively, SMF+PGW-C according to The priority that the priority of the S-NSSAI locally saved determines；Alternatively, the priority for the PDU session that SMF+PGW-C is determined, right This this programme is with no restrictions.

S305:AMF determines whether to distribute EBI for the PDU session.

In this step, AMF determines the corresponding DNN of the PDU session according to PDU session identification, further determines that the DNN is Other SMF+PGW-C of no correspondence, and if it exists, the SMF+PGW-C then newly requested and the SMF+PGW-C saved are corresponding excellent First grade.If the priority newly requested is high, EBI is distributed to the PDU session, and delete the EBI of the corresponding PDU of former SMF+PGW-C.

Specifically, AMF according to priority be

The priority of the corresponding S-NSSAI of the SMF+PGW-C that AMF is locally saved, alternatively,

The priority that SMF+PGW-C is provided to AMF.

Wherein, the priority that SMF+PGW-C is provided to AMF specifically:

SMF+PGW-C provides the corresponding ARP of the corresponding default QoS rule of PDU session to AMF, or,

The priority for the corresponding S-NSSAI of PDU session that SMF+PGW-C is provided to AMF, or,

SMF+PGW-C receives the priority of UE offer, and is sent to AMF, or,

The priority of SMF+PGW-C itself.

S306:AMF determines the corresponding EBI of SMF+PGW-C of the corresponding low priority of DNN, and initiates the mistake of recycling EBI Journey.

In this scenario, the corresponding PDU of the corresponding SMF+PGW-C of DNN that AMF determines as the corresponding high priority of DNN Session distributes EBI, then the corresponding EBI of the SMF+PGW-C of low priority can then be initiated to the process of recycling EBI.

S307:AMF returns to EBI assignment response to SMF+PGW-C.

S308:SMF+PGW-C returns to PDU conversation establishing SM context response to AMF.

S309:AMF returns to PDU session establishment to UE and receives.

In above-mentioned several steps, built according to SMF+PGW-C, for the information completion PDU session such as EBI of SMF+PGW-C distribution Vertical process.

The session establishing method provided in this embodiment having under N26 interface scene initiates session establishment request by UE, in meeting It talks about in establishment process, whether SMF+PGW-C can be transferred to 4G according to the PDU session that obtained precedence information determines that UE is requested In communication system, then request distribution EBI completes subsequent session establishment process, so as to need to conversate shift when, AMF can be determined shifts for which PDU session.It realizes PDU session establishment, while being moved to 4G from 5G communication system for UE During communication system, the property of can choose transfer PDU session is prepared.

Fig. 6 is the process signal of the session transferring method embodiment one of no N26 interface scene provided by the embodiments of the present application Figure, as shown in fig. 6, the session transferring method specifically includes the following steps:

S401:UE sends the request of PDU session establishment to AMF.

In this step, UE initiates the request of PDU session establishment, and optionally, carry the PDU session is transferred to the preferential of 4G Grade or the corresponding S-NSSAI of the PDU session are transferred to the priority of 4G.

S402:AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU meeting to the SMF+PGW-C selected Words creation SM context request.

In this step, AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends and request to SMF+PGW-C, PDU session identification, S-NSSAI and DNN are carried in request.Optionally, above-mentioned priority can also be carried.

S403:SMF+PGW-C requests the corresponding signing information of DNN to UDM+HSS.The S403 is optional step.

S404:SMF+PGW-C returns to PDU conversation establishing SM context response to AMF.

S405:AMF returns to PDU session establishment to UE and receives.

According to above-mentioned steps, PDU session establishment process is completed.

S406:SMF+PGW-C sends the corresponding relationship of the address SMF+PGW-C and priority to UDM+HSS.

In this step, SMF+PGW-C sends the corresponding relationship of the address SMF+PGW-C and Priority to UDM+HSS, can Choosing, SMF+PGW-C further sends APN or DNN to UDM+HSS, i.e. SMF+PGW-C sends APN or DNN to UDM+HSS, The corresponding relationship of the address SMF+PGW-C and Priority.In concrete implementation, step in the determination method and Fig. 5 of priority Similar in S304-S305, details are not described herein.

S407:UDM+HSS saves the corresponding relationship between the address APN, SMF+PGW-C and priority.

In this step, the corresponding relationship that UDM+HSS saves the address APN, SMF+PGW-C and Priority include at least with Lower two kinds of situations:

UDM+HSS only saves the corresponding relationship that can be transferred to the APN and SMF+PGW-C of 4G；Alternatively,

The corresponding relationship of UDM+HSS preservation APN, SMF+PGW-C and priority.

S408:UDM+HSS sends the corresponding relationship of APN and SMF+PGW-C to MME.

According to above-mentioned steps, if UDM+HSS saves the corresponding relationship of APN, SMF+PGW-C and priority, MME selection It can be transferred to the SMF+PGW-C of 4G communication system, to realize the PDU Session Hand-off of UE to 4G communication system.

Session transferring method provided in this embodiment, by during session establishment, by APN, SMF+PGW-C and preferential The corresponding relationship of grade is stored in UDM+HSS, and after UE is transferred to 4G communication system from 5G communication system, MME selection is transferable To the SMF+PGW-C of 4G communication system, during realizing that UE is moved to 4G communication system from 5G communication system, the property of can choose turns Move the purpose of PDU session.

Fig. 7 is the flow diagram of session establishing method embodiment two provided by the embodiments of the present application, as shown in fig. 7, should The specific steps of session establishing method include:

S501:SMF+PGW-C receives the PDU session establishment request that UE is sent.

In this step, UE initiates PDU session establishment in 5G communication system, and UE is sent by AMF to SMF+PGW-C The request of PDU session establishment, i.e. AMF need to select to close the SMF+PGW-C set for UE.One kind is in the specific implementation, can be in the PDU meeting Words, which are established, carries PDU session identification, S-NSSAI and DNN in request.

S502:SMF+PGW-C obtains APN corresponding with the PDU session of UE request foundation.

In this step, PDU session establishment request packet includes S-NSSAI and DNN, and SMF+PGW-C obtains UE request and establishes The specific implementation of the corresponding APN of PDU session be that SMF+PGW-C obtains APN corresponding with the S-NSSAI and DNN, Specifically include following several implementations:

The first implementation, SMF+PGW-C are obtained and the S-NSSAI and DNN pairs according to the policy information of preservation The APN answered.

In the program, policy information can be with local policy, carrier policy, and network, which is sliced, uses plan using strategy or APN Slightly etc., SMF+PGW-C obtains APN corresponding with S-NSSAI and DNN according to above-mentioned policy information.Specifically in above-mentioned plan The corresponding relationship of S-NSSAI and DNN and APN is slightly saved in information, SMF+PGW-C is according to corresponding relationship and S-NSSAI and DNN Obtain the APN.

Second of implementation, the SMF+PGW-C according to the S-NSSAI and DNN of preservation and the corresponding relationship of APN, Obtain the APN corresponding with the S-NSSAI and DNN.

In this step, SMF+PGW-C can be according to corresponding relationship, root between S-NSSAI, DNN and the APN locally saved According to the S-NSSAI and DNN carried in the request of PDU session establishment, corresponding APN is determined.

In addition to two kinds of above-mentioned implementations, if including in the PDU session establishment request that SMF+PGW-C is received APN, then it is to obtain the APN from the PDU session establishment request that UE is sent that SMF+PGW-C, which obtains the concrete mode of APN,.

S503:SMF+PGW-C sends the address of APN and SMF+PGW-C to UDM+HSS.

SMF+PGW-C get UE request establish the corresponding APN of PDU session after, by the address of the SMF+PGW-C with And APN is sent to UDM+HSS, so that the UDM+HSS can save the corresponding relationship between APN and the address of SMF+PGW-C.

S504:SMF+PGW-C sends PDU session establishment to UE and receives, and completes the establishment process of PDU session.

In this step, SMF+PGW-C sends PDU session establishment to UE by AMF and receives, and completes the foundation of PDU session Process.

The program one kind in the specific implementation, if UE send PDU session establishment request in without carry request build The vertical corresponding APN of PDU session is generated by SMF+PGW-C or is obtained the APN according to corresponding relationship, then completes PDU session When establishing, then includes the APN in the receiving of PDU session establishment, i.e., APN is sent to UE and saved.

The session establishing method of the present embodiment carries S-NSSAI and DNN during PDU session establishment in request, It is no longer one-to-one corresponding relationship so that SMF+PGW-C is obtained and requested the APN, i.e. APN and DNN of the PDU session established, But the corresponding relationship between S-NSSAI and DNN and APN, during subsequent PDU Session Hand-off to 4G communication system, It can be according to the corresponding APN of PDU session that the corresponding relationship determination to be shifted.

Fig. 8 is the flow diagram of session establishing method embodiment three provided by the embodiments of the present application, as shown in figure 8, On the basis of above-mentioned embodiment shown in Fig. 7, the specific steps of the session establishing method further include:

S505:SMF+PGW-C obtains APN-AMBR corresponding with APN.

In this step, SMF+PGW-C get UE request establish the corresponding APN of PDU session after, can also obtain with The corresponding APN-AMBR of APN, specific acquisition modes include at least following several:

The first acquisition modes, SMF+PGW-C obtain APN- corresponding with the APN according to the session AMBR of the UE AMBR。

The program is meant that the APN-AMBR is session- of the SMF+PGW-C according to the UE in 5G communication system What AMBR (i.e. session AMBR) was obtained.In a kind of specific implementation, SMF+PGW-C will use DNN's corresponding with the APN The session AMBR of all PDU sessions is added to obtain the APN-AMBR.DNN, S- corresponding with the first APN will be used What the session-AMBR of all PDU session of NSSAI was obtained after being added.

Second of acquisition modes, SMF+PGW-C obtain APN- corresponding with the APN according to the signing information of the UE AMBR。

That is the APN-AMBR is that SMF+PGW-C is obtained according to the signing information of the one-to-one APN of the DNN used with UE 's.

APN-AMBR corresponding with APN is sent to UE by S506:SMF+PGW-C.

APN-AMBR corresponding with APN is sent to UDM+HSS by S507:SMF+PGW-C.

In above-mentioned two step, the APN-AMBR corresponding with the APN is sent to the UE by SMF+PGW-C； And/or the APN-AMBR corresponding with the APN is sent to the UDM+HSS by SMF+PGW-C.

APN-AMBR corresponding with APN is sent to UE by SMF+PGW-C, so as to UE PDU Session Hand-off to 4G communication system After in system, controlled according to rate of the APN-AMBR to UE.

On the basis of above scheme, SMF+PGW-C sends the first information to UDM+HSS in a kind of specific implementation, described The first information determines the corresponding APN-AMBR of the APN for the UDM+HSS.

Optionally, the first information includes: the APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；Or Person, the corresponding DNN of the PDU session；Alternatively, the corresponding APN of DNN corresponding with the PDU session, which had with DNN The APN of one-to-one relationship.

Session establishing method provided in this embodiment, during PDU session establishment, SMF+PGW-C is used according to UE While DNN determines APN, SMF+PGW-C obtains APN-AMBR corresponding with APN and is sent to UE, so that the PDU session of UE turns After moving on in 4G communication system, controlled according to rate of the APN-AMBR to UE.

Fig. 9 is the flow diagram of session transferring method embodiment two provided by the embodiments of the present application, as shown in figure 9, should The specific steps of session transferring method include:

S601: when UE is determined the first PDU Session Hand-off to 4G communication system, UE obtains corresponding with the first PDU session The first APN.

In this step, after UE enters 4G communication system, determination needs to shift some the first PDU session, then may be used To obtain corresponding first APN of the first PDU session, so as to subsequent progress PDN connection use, in the specific implementation, including at least Several implementations below:

The first implementation, the UE according to the corresponding relationship between the PDU session of preservation and APN, obtain with it is described Corresponding first APN of first PDU session.

In this scenario, the corresponding relationship between PDU session and APN include: PDU session S-NSSAI and DNN with Corresponding relationship between APN；Alternatively, the corresponding relationship between the PDU session identification and APN of PDU session.

The corresponding relationship can obtain during PDU session establishment, such as: in the foundation of the first PDU session Cheng Zhong, the UE receive first APN corresponding with the first PDU session that SMF+PGW-C is sent；The UE is obtained and is saved Corresponding relationship between the first PDU session and the first APN.It is also available during other PDU session establishments To corresponding corresponding relationship.

Second of implementation, the UE is according at least to URSP determination and the S-NSSAI of the first PDU and DNN pairs The first APN answered.

In the URSP that UE is saved, the corresponding relationship comprising S-NSSAI and DNN and APN.Optionally, on the road of URSP By selecting in description, the corresponding relationship comprising S-NSSAI and DNN and APN.

The URSP is that UE receives network side entity PCF+PCRF and is sent to UE by AMF.

The third implementation, the UE are generated and the S-NSSAI and DNN corresponding described first of the first PDU APN。

Optionally, the first APN of UE dynamic generation.

S602:UE sends PDN connection to MME and establishes request.

In this step, PDN connection establishes in request and carries corresponding first APN of the first PDU session, so as to MME conversates creation according to the APN.

S603:UE, which receives the PDN connection that MME is sent and establishes, to be received.

The PDN connection that UE receives MME return, which is established, to be received, or receives PDN connection establishment response, completes PDN connection, I.e. by the PDU Session Hand-off of UE to 4G communication system.

Above scheme one kind in the specific implementation, UE receive SMF+PGW-C send it is corresponding with the first PDU session The first APN-AMBR.

First APN-AMBR is AMBR corresponding with the first PDU session, UE PDU Session Hand-off to 4G communication system After in system, UE can be controlled rate according to APN-AMBR.

Session transferring method provided in this embodiment is determined the PDU to be created by UE during PDU session establishment The corresponding APN of session, and it is sent to SMF+PGW-C, UE is locally saving the corresponding relationship between PDU session and APN, in UE During 4G communication system is moved to from 5G communication system, the corresponding APN of PDU session to be shifted can be determined by UE, realized Selectively transfer PDU session.

Based on above-mentioned each embodiment it is found that the main thought of above-mentioned solution two is: breaking DNN and APN one by one The limitation of mapping, modification are as follows:Two, which are included at least, in concrete implementation says realization approach.

Realization approach 1:SMF+PGW-C sends APN to UE.

When UE establishes PDU session in 5G, SMF+PGW-C generates corresponding APN according to S-NSSAI and DNN, and is sent to UE.Optionally, UE is sent to by PCO.

Without under N26 scene, which is further sent to UDM+HSS and protected by SMF+PGW-C It deposits.

UE saves the corresponding relationship of PDU session and APN, and what is specifically saved may is that between S-NSSAI, DNN and APN Corresponding relationship, alternatively, the corresponding relationship of PDU session identification and APN.

When UE enters 4G communication system, UE determines the corresponding APN of PDU session to be transferred.

Without N26 scene, PDN connection is initiated using the APN and establishes request.

Optionally, in above process, SMF+PGW-C can also determine the corresponding APN-AMBR of the APN, SMF+PGW-C The APN-AMBR is sent to UE.

The APN-AMBR is that SMF+PGW-C is obtained according to the UE in the session-AMBR of 5G.Specifically, it will use and this What the session-AMBR of all PDU sessions of the first APN corresponding DNN, S-NSSAI was obtained after being added.Alternatively, according to UE's It is obtained with the signing information of the one-to-one APN of DNN.

Realization approach 2:UE provides APN to SMF+PGW-C.

When UE establishes PDU session in 5G, UE sends APN corresponding with PDU session to SMF+PGW-C by PCO, and UE is obtained The concrete mode for taking the corresponding APN of the PDU session includes:

UE determines the corresponding APN of S-NSSAI, the DNN according to URSP, alternatively,

UE is generated according to the local information that saves, alternatively,

UE dynamic generation,

SMF+PGW-C is stored to the corresponding relationship that UDM+HSS sends APN and SMF+PGW-C in another kind realization.

No N26 scene: UE initiates PDN connection using the APN and establishes request.

Based on above-mentioned thinking, the session establishing method that second of solution is provided below by two specific examples It is illustrated with session transferring method.

Figure 10 is the flow diagram of one example of session establishing method provided by the embodiments of the present application and session transferring method, As shown in Figure 10, the specific implementation step of the session establishing method and session transferring method includes:

S701:UE sends the request of PDU session establishment to AMF.

In this step, UE initiates the request of PDU session establishment in 5G, and PDU session identification, S- are carried in the request NSSAI and DNN.Wherein, S-NSSAI (Single Network Slice Selection Assistance Information Single network slice selection auxiliary information) it is used for informing network, UE establishes PDU session in which slice.

S702:AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU conversation establishing SM to SMF+PGW-C Context (Nsmf_PDUSession_CreateSMContext Request) request.It carries in the message and is carried in step 701 PDU session establishment request.

In this step, AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU session to SMF+PGW-C SM context request is created, carries PDU session identification, S-NSSAI and DNN in the request.

S703:SMF+PGW-C requests the corresponding signing information of DNN to UDM+HSS.The step is optional step.

S704:SMF+PGW-C obtains the first APN according to the S-NSSAI and DNN of UE.

In this step, SMF+PGW-C obtains the first APN according to the S-NSSAI and DNN of UE, which can be SMF+ First APN of PGW-C dynamic generation.Specifically, SMF+PGW-C is according to S-NSSAI and DNN, alternatively, according to PDU session identification The first APN generated.

First APN can also be the APN that SMF+PGW-C is obtained according to the corresponding relationship locally saved.It is a kind of specific In implementation, SMF+PGW-C obtains the first APN according to the corresponding relationship of S-NSSAI, DNN and APN.

S705:SMF+PGW-C returns to PDU conversation establishing SM context response to AMF.

S706:AMF returns to PDU session establishment to UE and receives.

In above-mentioned steps, SMF+PGW-C sends the first APN to UE by AMF so that UE according to the first APN into Row PDN connection is established.

It, should in the program in the specific implementation, SMF+PGW-C can also determine the corresponding APN-AMBR of the first APN APN-AMBR is that SMF+PGW-C is obtained according to the UE in the session-AMBR of 5G.Specifically, it will use and the first APN pairs What the session-AMBR of all PDU sessions (session) of DNN, the S-NSSAI answered was obtained after being added.Alternatively, SMF+PGW- C obtains APN-AMBR according to the signing information of UE and DNN one-to-one APN.Then SMF+PGW-C sends the APN- to UE AMBR, so that UE carries out power control according to the APN-AMBR.

The corresponding relationship of S707:UE preservation PDU session and the first APN.

In this step, UE saves the corresponding relationship of the PDU session and the first APN.Specifically, UE save the first APN and The corresponding relationship of DNN, S-NSSAI, alternatively, the corresponding relationship of the first APN and PDU session identification.

Optionally, if SMF+PGW-C has sent the corresponding APN-AMBR of the first APN to UE, UE is further saved APN-AMBR。

S708:SMF+PGW-C sends the corresponding relationship of the address SMF+PGW-C and the first APN to UDM+HSS.

In this step, SMF+PGW-C sends the corresponding relationship of the address SMF+PGW-C and the first APN to UDM+HSS, with Just UDM+HSS stores the corresponding relationship of the address SMF+PGW-C and APN.

In this process, optionally, SMF+PGW-C further sends the first information to UDM+HSS, which is used for UDM+HSS determines the APN-AMBR of the first APN.

Wherein, the first information specifically may is that

The APN-AMBR that SMF+PGW-C is determined；Alternatively,

The PDU corresponding DNN, UDM+HSS obtain the subscription data of corresponding 2nd APN according to DNN；Alternatively,

DNN corresponding with PDU session corresponding 2nd APN, UDM obtain subscription data according to the 2nd APN, and by the signing Data are set as the subscription data of the first APN.

Note: APN corresponding with DNN, APN corresponding with DNN and S-NSSAI, is different.APN corresponding with DNN be Refer to and the directly one-to-one APN of DNN.

In this scenario, the method that UE obtains the corresponding APN-AMBR of the first APN includes: SMF+PGW-C in step S705- S706 is determined, and issues UE.Or, SMF+PGW-C is determined, and UDM+HSS is issued, UDM+HSS issues MME, and MME passes through step S714 is sent to UE.Or, UDM+HSS is determined, and MME is issued, MME is sent to UE by step S714.

S709:UDM+HSS sends the corresponding relationship of SMF+PGW-C ID and the first APN to MME.

In this step, UDM+HSS to MME send SMF+PGW-C ID and the first APN corresponding relationship, so as to it is subsequent into Row PDN connection is established.

Optionally, UDM+HSS can also send the APN-AMBR to SMF+PGW-C.

Further, UDM+HSS sends the subscription data of the first APN to MME.

S710:UE, which is determined, is moved to 4G communication system for certain PDU session, and the corresponding relationship that UE is saved according to S707 determines The corresponding APN of the PDU session.

S711:UE sends PDN connection to MME and establishes request.

S712:MME obtains the address of SMF+PGW-C according to the corresponding relationship of APN and SMF+PGW-C, and to the SMF+ PGW-C sends creation session request.

S713:SMF+PGW-C replys creation conversational response to MME.

S714:MME returns to PDN connection establishment response to UE.

In above-mentioned several steps, UE, which is determined, is moved to 4G for certain PDU session, then the correspondence that UE is saved according to step S307 Relationship determines the corresponding APN of the PDU session, and then UE sends PDN connection to MME and establishes request, carries in the request The APN that handover instruction and step S710 are obtained.MME is closed according to the corresponding of the step S709 APN obtained and SMF+PGW-C System obtains the address of SMF+PGW-C, and sends creation session request to the SMF+PGW-C, carries handover in the request and refers to Show and APN, SMF+PGW-C are replied to MME and created conversational response, MME replys PDN connection establishment response to UE, completes PDN session It establishes, i.e., by the PDU Session Hand-off of UE to 4G communication system.

Session establishing method and session transferring method provided in this embodiment, during carrying out PDU conversation establishing, SMF+PGW-C obtains the corresponding APN of PDU session of creation, and is sent to UE, and UE is saved between PDU session and APN locally Corresponding relationship the PDU session to be shifted can be determined by UE during UE is moved to 4G communication system from 5G communication system Corresponding APN realizes selectively transfer PDU session.

Figure 11 is the process signal of session establishing method provided by the embodiments of the present application and another example of session transferring method Figure, as shown in figure 11, the specific implementation step of the session establishing method and session transferring method includes:

S801:UE determines corresponding first APN of DNN, S-NSSAI.

In this step, UE determines corresponding first APN of DNN, S-NSSAI, specifically, UE can be according to local preservation The corresponding relationship of DNN, S-NSSAI and APN obtain the first APN, alternatively, according to UE routing strategy (UE Route Selection Policy, URSP) obtain the first APN.

It is specifically as follows to the content of URSP:

Rule priority

Traffic descriptor

- Application mark

-IP descriptors

-Non-IP descriptors

Route selection descriptor

-SSC mode selection

-Network Slice Selection

-DNN selection

-APN

- Non-Seamless Offload indication: whether it is diverted to non-3GPP

- Access Type Preference:3GPP or non-3GPP

S802:UE sends the request of PDU session establishment to AMF.

S803:AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU conversation establishing SM to SMF+PGW-C Context request.

It, can be to SMF+PGW- when UE sends the request of PDU session establishment to SMF+PGW-C by AMF in above-mentioned steps C sends the first APN.Optional, the first APN can be sent by PCO.

S804:SMF+PGW-C requests the corresponding signing information of DNN to UDM+HSS.

S805:SMF+PGW-C returns to PDU conversation establishing SM context response to AMF.

S806:AMF returns to PDU session establishment to UE and receives.

Above-mentioned steps are similar with the step S705-S706 in Figure 10, and details are not described herein.

S807:SMF+PGW-C sends the corresponding relationship of the address SMF+PGW-C and the first APN to UDM+HSS.

S808:UDM sends the corresponding relationship of SMF+PGW-C ID and the first APN to MME.

Above-mentioned steps are similar with the step S708-S709 in Figure 10, and details are not described herein.

S809:UE, which is determined, is moved to 4G communication system for certain PDU session, and the corresponding relationship that UE is saved according to S801 determines The corresponding APN of the PDU session.

S810:UE sends PDN connection to MME and establishes request.

S811:MME obtains the address of SMF+PGW-C according to the corresponding relationship of APN and SMF+PGW-C, and to the SMF+ PGW-C sends creation session request.

S812:SMF+PGW-C replys creation conversational response to MME.

S813:MME returns to PDN connection establishment response to UE.

Session establishing method and session transferring method provided in this embodiment, it is unlike the embodiments above, in PDU meeting It talks about in establishment process, the corresponding APN of PDU session to be created is determined by UE, and be sent to SMF+PGW-C, UE is in local guarantor The corresponding relationship between PDU session and APN has been deposited, during UE is moved to 4G communication system from 5G communication system, Ke Yiyou The UE determination corresponding APN of PDU session to be shifted, realizes selectively transfer PDU session.

Figure 12 is the flow diagram of session transferring method embodiment three provided by the embodiments of the present application, as shown in figure 12, Session transferring method provided in this embodiment specifically includes the following steps:

S901: when UE, which is determined, to be needed PDU session being moved to 4G from 5G, UE sends PDN connection request to MME.

In this step, when UE enters 4G communication system from 5G communication system, then UE determination needs to lead to PDU session from 5G Letter system is transferred to 4G communication system, and UE can send PDN connection to MME and establish request, and it is corresponding to carry the PDU session APN and PDU session identification.

The program shifts instruction in the specific implementation, can carry in PDN connection foundation request, i.e., handover refers to Show, transfer instruction is used to indicate PDU Session Hand-off to 4G communication system.

S902:MME is according to the corresponding APN and PDU session identification of PDU session, and APN, SMF+ for obtaining from UDM+HSS Corresponding relationship between PGW-C and PDU session identification determines the first SMF+PGW-C.

In this step, during UE carries out PDU conversation establishing, or before this step, MME receives UDM+HSS Corresponding relationship between APN, SMF+PGW-C and PDU session identification of transmission.MME saves the corresponding relationship, is receiving After APN the and PDU session identification sent to UE, according to APN and PDU session identification and above-mentioned corresponding relationship, selection First SMF+PGW-C out.

S903:MME sends creation session request to the first SMF+PGW-C.

S904:MME receives the creation conversational response that the first SMF+PGW-C is returned.

S905:UE receives the PDN connection response that MME is returned.

In above process, it after MME selects the first SMF+PGW-C, is sent to the first SMF+PGW-C and carries APN Creation session request, the first SMF+PGW-C according to according to creation session request in PDU session identification detect whether exist The PDU session, and if it exists, then determine that conversate creation by the PDU Session Hand-off to 4G communication system, and return and create to MME Conversational response is built, MME is responded according to the conversation establishing received, returns to PDN connection response to UE, i.e. completion PDN connection is established, By PDU Session Hand-off to 4G communication system.

Figure 13 is the flow diagram of session transferring method example IV provided by the embodiments of the present application, as shown in figure 13, Session transferring method provided in this embodiment specifically includes the following steps:

S1001: when UE, which is determined, to be needed PDU session being moved to 4G from 5G, UE sends PDN connection request to MME.

S1002:MME is according to the corresponding APN of PDU session, from least one corresponding SMF+PGW-C of APN, selects first SMF+PGW-C。

S1003:MME sends creation session request to the first SMF+PGW-C.

Abovementioned steps are similar with S901-S903 in embodiment shown in Figure 12, and details are not described herein.

S1004:MME receives the creation session rejection response that the first SMF+PGW-C is returned.

In this step, it after MME selects the first SMF+PGW-C, is sent to the first SMF+PGW-C and carries APN's Session request is created, the first SMF+PGW-C detects whether there is this according to according to the PDU session identification in creation session request PDU session, if it does not exist, it is determined that refuse conversation establishing request, and return to session rejection response, optionally, the meeting to MME Words can carry the reason of being rejected in refusing to respond, such as: PDU session corresponding with the PDU session identification is not present.

S1005:MME selects any in addition to the first SMF+PGW-C from least one corresponding SMF+PGW-C of APN A 2nd SMF+PGW-C initiates conversation establishing, and after repeating this step until completing conversation establishing, MME returns to PDN connection to UE and rings It answers.

In this step, MME is responded according to the session rejection received, then selects one from remaining SMF+PGW-C A 2nd SMF+PGW-C initiates conversation establishing, and until completing the conversation establishing, MME returns to PDN connection response to UE, that is, completes PDN connection is established, by PDU Session Hand-off to 4G communication system.

Figure 14 is the flow diagram of session transferring method embodiment five provided by the embodiments of the present application, as shown in figure 5, this The session transferring method that embodiment provides is applied in SMF+PGW-C, specifically includes the following steps:

S1101:SMF+PGW-C receives the creation session request that MME is sent, and creation session request carries transfer instruction, PDU Session identification and APN.

S1102:SMF+PGW-C detects whether that there are the corresponding PDU sessions of PDU session identification according to PDU session identification.

S1103: if it is not, then returning to creation session rejection response, the original of creation session rejection response instruction refusal to MME Cause.

S1104: if so, completing creation session according to creation session request, and creation conversational response is sent to MME.

In above-mentioned steps, SMF+PGW-C detects whether exist according to according to the PDU session identification in creation session request The PDU session, and if it exists, then determine that conversate creation by the PDU Session Hand-off to 4G communication system, and return and create to MME Build conversational response；If it does not exist, it is determined that refuse conversation establishing request, and return to session rejection response to MME, so that MME Other SMF+PGW-C is reselected to conversate transfer.

Based on above-mentioned each embodiment it is found that the main thought of above-mentioned solution three is: being still DNN and APN mono- One is corresponding, and the PDU session of the corresponding multiple slice of DNN can be transferred to 4G.

Realization approach 1:

For UE during carrying out PDU session establishment, SMF+PGW-C sends APN, PDU session identification and SMF+ to UDM+HSS The corresponding relationship of PGW-C.

When UE enters 4G, UE is determined when needing to shift PDU session, in 4G, sent to MME carry PDU session identification and Request is established in the PDN connection of APN, and MME is closed according to the corresponding of APN, PDU session identification and SMF+PGW-C obtained from UDM+HSS System selects SMF+PGW-C to conversate creation, completion PDN connection.

Realization approach 2:

MME initiates conversation establishing optional one from the corresponding multiple SMF+PGW-C of 1 DNN；

If SMF+PGW-C returns to failure, MME selects another SMF+PGW-C, initiates conversation establishing until by the PDU Session Hand-off is to 4G communication system.

Figure 15 is the process signal of session establishing method provided by the embodiments of the present application and session transferring method yet another embodiment Figure, as shown in figure 15, the specific implementation step of the session establishing method and session transferring method are as follows:

S1201:UE sends the request of PDU session establishment to AMF.

In this step, UE initiates the request of PDU session establishment in 5G, and PDU session identification, S- are carried in the request NSSAI and DNN.

S1202:AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends PDU conversation establishing SM to SMF+PGW-C Context request.

In this step, AMF selects SMF+PGW-C according to S-NSSAI and DNN, and sends and request to SMF+PGW-C, PDU session identification, S-NSSAI and DNN are carried in request.

S1203:SMF+PGW-C requests the corresponding signing information of DNN to UDM+HSS.This step is optional step.

S1204:SMF+PGW-C returns to PDU conversation establishing SM context response to AMF.

S1205:AMF returns to the response of PDU session establishment to UE.

In above-mentioned steps, SMF+PGW-C sends PDU session establishment response message to UE by AMF.

S1206:SMF+PGW-C sends the address SMF+PGW-C, the corresponding relationship of DNN and PDU session identification to UDM+HSS.

S1207:UDM+HSS sends the address SMF+PGW-C, the corresponding relationship of APN and PDU session identification to MME.

S1208:UE, which is determined, is moved to 4G communication system for certain PDU session, and UE determines the PDU session corresponding APN and PDU Session identification.

In this step, UE, which is determined, is moved to 4G for certain PDU session, and UE determines the corresponding APN and PDU meeting of the PDU session Words mark.

S1209:UE connects foundation request to the PDN that MME sends carrying carrying APN with PDU session identification.

S1210:MME selects SMF+PGW-C according to PDU session identification and APN.

S1211:MME sends creation session request to SMF+PGW-C.

S1212:SMF+PGW-C replys creation conversational response to MME.

S1213:MME returns to PDN connection establishment response to UE.

In above-mentioned several steps, UE determination will be sent to MME PDN connection establish request, in the request carry APN and PDU session identification.MME selects SMF+PGW-C according to the corresponding relationship of the APN and SMF+PGW-C of acquisition, and to the SMF+ PGW-C sends creation session request, carries APN, and SMF+PGW-C replys creation conversational response to MME, and MME replys PDN to UE and connects Foundation response is connect, completes PDN session establishment, i.e., by the PDU Session Hand-off of UE to 4G communication system.

Figure 16 is the process signal of session establishing method provided by the embodiments of the present application and the another example of session transferring method Figure, as shown in figure 16, the specific implementation step of the session establishing method and session transferring method are as follows:

S1301:UE sends PDN connection to MME and establishes request.

In this step, UE initiates PDN connection in 4G and establishes request, carries handover instruction, APN and PDU session ID。

S1302:MME selects a SMF+PGW-C-1 according to APN from multiple SMF+PGW-C.

S1303:MME initiates creation session request to selected SMF+PGW-C-1.

In above-mentioned steps, MME selects one according to APN from multiple SMF+PGW-C, the SMF+PGW-C hair of Xiang Xuanding Play creation session request.

S1304:SMF+PGW-C-1 detects whether that there are PDU sessions according to the PDU session identification in PCO.

S1305: if it is not, SMF+PGW-C-1 returns to creation session rejection to MME.

In this step, SMF+PGW-C detects whether that there are PDU sessions according to the PDU session identification in PCO, if it is not, then Refusal, and cause value is carried, for example, without this PDU session.

S1306:MME selects other SMF+PGW-C-2 to conversate creation according to the reason in creation session rejection.

MME selects other SMF+PGW-C, i.e., above-mentioned SMF+PGW-C-2 according to reject cause.

S1307:MME sends creation session request to SMF+PGW-C-2.

S1308:SMF+PGW-C-2 replys creation conversational response to MME.

S1309:MME returns to PDN connection establishment response to UE.

In above-mentioned several steps, if SMF+PGW-C is determined according to PCO there are the PDU session, subsequent PDN is completed Establishment process is connected, PDU Session Hand-off is completed.

Figure 17 is the structural schematic diagram of UE embodiment one provided by the embodiments of the present application, and as shown in figure 17, which includes Sending module 11, processing module 12 and receiving module 13.

The UE's in the specific implementation, sending module 11, for sending first message to access and AMF, described first disappears Breath is for establishing PDU session；Wherein, the first message includes the request of PDU session establishment and precedence information, the priority Information is used to indicate the PDU Session Hand-off of the UE request foundation to the priority of 4G communication system；

Receiving module 13 sends second message for receiving the AMF, and the second message includes that PDU session establishment connects By.

Optionally, the UE further include:

Processing module 12, for determining the precedence information according to the combination of one or more of information:

The corresponding S-NSSAI of the PDU session；

Use the application of the PDU session；

The URSP that the UE is saved；

Optionally, processing module 12, for when the UE is moved to 4G communication system from 5G communication system, according to using The precedence information of the corresponding each PDU session of DNN determine and be transferred to the first PDU session of 4G communication system.

Optionally, the processing module 12 is specifically used for:

The UE that above-mentioned each implementation provides, for executing the technical solution of the side UE in aforementioned either method embodiment, The realization principle and technical effect are similar, and details are not described herein.

Figure 18 is the structural schematic diagram of AMF embodiment one provided by the embodiments of the present application, as shown in figure 18, the AMF 20 packet Include sending module 21, processing module 22 and receiving module 23.

The AMF's in the specific implementation, sending module 21, is moved to 4G communication system from 5G communication system for working as UE When, the information of the corresponding PDN connection of the first PDU session is sent to MME, the information of the PDN connection is described for the MME UE establishes PDN connection；

Optionally, the AMF further include: receiving module 23 is used for:

Optionally, the receiving module 23 is specifically used for:

Optionally, the AMF further include: processing module 22；

The receiving module 23 is also used to receive the EBI distribution request that the first SMF+PGW-C is sent；

The processing module 22 is specifically used for:

Alternatively,

The processing module 22 is specifically used for:

Alternatively,

The processing module 22 is specifically used for:

Alternatively,

The processing module 22 is specifically used for:

Optionally, the EBI distribution request includes the mark of the first PDU session, and the processing module 23 is also used to Corresponding first DNN of the first PDU session is determined according to the mark of the first PDU session.

Optionally, the processing module 22 is also used to:

Alternatively,

Obtain the corresponding priority of each SMF+PGW-C.

Optionally, the sending module 21 is also used to send the letter of the corresponding PDN connection of the 4th PDU session to the MME Breath, the 4th PDU session and the first PDU session use identical DNN and SMF+PGW-C.

Optionally, the AMF further include: processing module 22；

The processing module 22 is used to obtain the described of highest priority in the corresponding multiple PDU sessions of the first DNN First PDU session；

The sending module 21 is also used to the first SMF+PGW-C request described first corresponding to the first PDU session The information of the corresponding PDN connection of PDU session；

Alternatively,

The sending module 21 is also used to the first SMF+PGW-C request described first corresponding to the first PDU session The information of the corresponding PDN connection of PDU session, and obtain and connected using the corresponding PDN of other PDU sessions of the first DNN The information connect.

Optionally, the receiving module 23 is specifically used for:

Optionally, the precedence information that the received UE of the receiving module 23 is sent, comprising:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

The AMF that above-mentioned each implementation provides, for executing the technical side of the side AMF in aforementioned either method embodiment Case, the realization principle and technical effect are similar, and details are not described herein.

Figure 19 is the structural schematic diagram of SMF+PGW-C embodiment one provided by the embodiments of the present application, as shown in figure 19, should SMF+PGW-C 30 includes processing module 31, sending module 32 and receiving module 33.

In the specific implementation of the SMF+PGW-C30:

Processing module 31, the PDU Session Hand-off for during the PDU session establishment of UE, obtaining the UE are logical to 4G The precedence information of letter system；

Sending module 32, for the precedence information to be sent to UDM+HSS or AMF.

Optionally, the also SMF+PGW-C includes: receiving module 33；

Alternatively,

The SMF+PGW-C that above-mentioned each implementation provides, for executing SMF+PGW-C in aforementioned either method embodiment The technical solution of side, the realization principle and technical effect are similar, and details are not described herein.

Figure 20 is the structural schematic diagram of UDM+HSS embodiment one provided by the embodiments of the present application, as shown in figure 20, the UDM+ HSS 40 includes memory module 41, processing module 42, sending module 43 and receiving module 44.

In the specific implementation of the UDM+HSS 40:

Memory module 41, the address of DNN, SMF+PGW-C that the PDU session of the UE for preservation uses and pair of priority It should be related to；Wherein, priority is used to indicate that the corresponding PDU session of SMF+PGW-C is corresponding to be transferred to the preferential of 4G communication system Grade, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module 42, with according to the priority of preservation, not determining the UE the first SMF used in 4G communication system The address+PGW-C；

Sending module 43, for sending the first address SMF+PGW-C and APN to MME；Wherein, the APN and institute It is corresponding to state DNN.

Optionally, the processing module 42 is specifically used for:

Optionally, the receiving module 44 is used to receive the address DNN, SMF+PGW-C of SMF+PGW-C transmission and preferential Grade；

The processing module 42 is also used to determine whether to save other corresponding SMF+PGW-C of the DNN and preferential Corresponding relationship between grade；

It has been protected if so, the processing module 42 is also used to judge whether the corresponding priority of the SMF+PGW-C is higher than The corresponding priority of other corresponding described SMF+PGW-C of the DNN deposited；

If so, the memory module 41 saves the corresponding relationship of the SMF+PGW-C Yu the priority.

The UDM+HSS that above-mentioned each implementation provides, for executing the side UDM+HSS in aforementioned either method embodiment Technical solution, the realization principle and technical effect are similar, and details are not described herein.

Figure 21 is the structural schematic diagram of UDM+HSS embodiment two provided by the embodiments of the present application, as shown in figure 21, the UDM+ HSS 50 includes memory module 51, processing module 52, sending module 53 and receiving module 54.

In the specific implementation of the UDM+HSS 50:

Memory module 51, for saving APN, SMF+PGW-C's used in the PDU Session Hand-off to 4G communication system of UE The corresponding relationship of address and priority；Wherein, priority is used to indicate that the corresponding PDU session of SMF+PGW-C is corresponding to be transferred to The priority of 4G communication system, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module 52 determines the UE the first SMF used in 4G communication system for the priority according to preservation The address+PGW-C；

Sending module 53 is used for MME with sending the first address SMF+PGW-C and the first SMF+PGW-C The corresponding APN in location.

Optionally, the processing module 52 is specifically used for being determined in the SMF+PGW-C saved according to the corresponding relationship, The address of the SMF+PGW-C of highest priority is as the first address SMF+PGW-C.

Optionally, institute UDM+HSS is stated further include:

Receiving module 54, for receiving the address APN, SMF+PGW-C and the priority of SMF+PGW-C transmission；

The processing module 52, for determining locally whether save other corresponding SMF+ of the corresponding DNN of the APN Corresponding relationship between PGW-C and priority；

It has been saved if so, processing module 52 is also used to judge whether the SMF+PGW-C corresponding priority is higher than The corresponding priority of other corresponding described SMF+PGW-C of the DNN；

If so, memory module 51 saves the corresponding relationship of the SMF+PGW-C Yu the priority.

Figure 22 is the structural schematic diagram of UE embodiment two provided by the embodiments of the present application, and as shown in figure 22, which includes Processing module 61, sending module 62 and receiving module 63.

In the specific implementation of the UE 60:

Processing module 61, for obtaining and described first when determining the first PDU Session Hand-off to 4G communication system Corresponding first APN of PDU session；

Sending module 62 establishes request for sending PDN connection to MME；The PDN connection is established in request described in carrying Corresponding first APN of first PDU session；

Receiving module 63, the PDN connection for receiving MME transmission, which is established, to be received, to establish the PDN connection.

Optionally, the processing module 61 is specifically used for:

Alternatively,

Optionally, the receiving module 63 is also used in the establishment process of the first PDU session, receives SMF+PGW- First APN corresponding with the first PDU session that C is sent；

The processing module 61 is also used to obtain and saves the first PDU session and described first in the storage device Corresponding relationship between APN.

Optionally, the processing module 61 is specifically used for:

Alternatively,

Generate first APN corresponding with the S-NSSAI and DNN of the first PDU.

Optionally, the receiving module 63 is also used to receive the corresponding with the first PDU session of SMF+PGW-C transmission First APN-AMBR.

Figure 23 is the structural schematic diagram of SMF+PGW-C embodiment two provided by the embodiments of the present application, as shown in figure 23, should SMF+PGW-C 70 includes: receiving module 71, processing module 72 and sending module 73.

In the specific implementation of the SMF+PGW-C 70:

Receiving module 71, for receiving the PDU session establishment request of UE transmission；

Processing module 72, for obtaining APN corresponding with the PDU session of UE request foundation；

Sending module 73, for sending the address of the APN Yu the SMF+PGW-C to UDM+HSS；

The sending module 73, which is also used to send PDU session establishment to the UE, to be received, and the foundation of the PDU session is completed Process.

Optionally, the PDU session establishment request packet includes S-NSSAI and DNN, and the processing module 72 is specifically used for:

Obtain APN corresponding with the S-NSSAI and DNN.

Optionally, the processing module 72 is specifically used for:

Alternatively,

Optionally, the PDU session establishment request packet includes the APN, and the processing module 72 is also used to from the PDU meeting Words are established in request and obtain the APN.

It optionally, include the APN in the PDU session establishment receiving.

Optionally, the processing module 72 is also used to obtain APN-AMBR corresponding with the APN.

Optionally, the sending module 73 is also used to:

The APN-AMBR corresponding with the APN is sent to the UE；

And/or

The APN-AMBR corresponding with the APN is sent to the UDM+HSS.

Optionally, the processing module 72 is specifically used for:

Alternatively,

Optionally, the processing module 72 is specifically used for:

Optionally, the sending module 73 is also used to send the first information to UDM+HSS, and the first information is for described UDM+HSS determines the corresponding APN-AMBR of the APN.

Optionally, the first information includes:

The APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；

Alternatively,

The corresponding DNN of the PDU session；

Alternatively,

The corresponding APN of DNN corresponding with the PDU session.

Figure 24 is the structural schematic diagram of UE embodiment three provided by the embodiments of the present application, and as shown in figure 24, which includes Sending module 81, receiving module 82.

In the specific implementation of the UE 80:

Sending module 81, for sending PDN connection to MME and asking when determination needs PDU session being moved to 4G from 5G It asks；The PDN connection request carries the corresponding APN and PDU session identification of the PDU session；

Receiving module 82, the PDN connection response returned for receiving the MME.

Figure 25 is the structural schematic diagram of MME embodiment one provided by the embodiments of the present application, as shown in figure 25, the MME 90 packet Include receiving module 91, processing module 92 and sending module 93.

In the specific implementation of the MME:

Receiving module 91, for receiving the PDN connection request of UE transmission；The PDN connection request carries the PDU session Corresponding APN and PDU session identification；

Processing module 92, for being obtained according to the corresponding APN and PDU session identification of the PDU session, and from UDM+HSS The corresponding relationship between APN, SMF+PGW-C and PDU session identification obtained, determines the first SMF+PGW-C；

Sending module 93, for sending creation session request to the first SMF+PGW-C；

The receiving module 91 is also used to receive the creation conversational response that the first SMF+PGW-C is returned；

The sending module 93 is also used to return to PDN connection response to the UE according to the creation conversational response.

Optionally, the receiving module 91 is also used to receive APN, SMF+PGW-C and PDU session mark of UDM+HSS transmission Corresponding relationship between knowledge.

The MME that above-mentioned each implementation provides, for executing the technical side of the side MME in aforementioned either method embodiment Case, the realization principle and technical effect are similar, and details are not described herein.

Figure 26 is the structural schematic diagram of MME embodiment two provided by the embodiments of the present application, as shown in figure 26, the MME 100 Including receiving module 101, processing module 102 and sending module 103.

In the specific implementation of the MME:

Receiving module 101, for receiving the PDN connection request of UE transmission；The PDN connection request carrying transfer instruction, The corresponding APN and PDU session identification of the PDU session, the transfer instruction are used to indicate PDU Session Hand-off to 4G network；

Processing module 102 is used for according to the corresponding APN of the PDU session, from least one corresponding SMF+ of the APN In PGW-C, the first SMF+PGW-C is selected；

Sending module 103, for sending creation session request to the first SMF+PGW-C；

If the receiving module 101 receives the creation session rejection response that the first SMF+PGW-C is returned；The wound It builds in session rejection response and carries the reason of being rejected, the processing module is from least one corresponding SMF+PGW-C of the APN In, selection the 2nd SMF+PGW-C either one or two of in addition to the first SMF+PGW-C initiates conversation establishing, and it is straight to repeat this step To after completing conversation establishing, the sending module 103 returns to PDN connection response to UE.

Figure 27 is the structural schematic diagram of SMF+PGW-C embodiment three provided by the embodiments of the present application, as shown in figure 27, should SMF+PGW-C 110 includes: receiving module 111, processing module 112 and sending module 113.

Receiving module 111, for receiving the creation session request of MME transmission, the creation session request carries transfer and refers to Show, PDU session identification and APN；

Processing module 112, for detecting whether that there are the PDU session identification is corresponding according to the PDU session identification PDU session；

Sending module 113, if for processing module detect be it is no, to the MME return creation session rejection response, The reason of creation session rejection response instruction refusal；

The processing module 112 is also used to if so, completing creation session according to the creation session request；

The sending module 113 is also used to send creation conversational response to the MME.

Entity apparatus

Figure 28 is the structural schematic diagram of UE example IV provided by the embodiments of the present application, and as shown in figure 28, which at least wraps It includes: for sending the transmitter of message, the receiver for receiving message, memory and processor.

Optionally, receiver and transmitter can be realized by transceiver

In the specific implementation of the UE:

Optionally, the UE further include:

The corresponding S-NSSAI of the PDU session；

Use the application of the PDU session；

The URSP that the UE is saved；

Optionally, the processor is specifically used for:

Figure 29 is the structural schematic diagram of AMF embodiment two provided by the embodiments of the present application, and as shown in figure 29, the AMF is at least Include: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the AMF:

Optionally, the AMF further include: receiver is used for:

Optionally, the receiver is specifically used for:

Optionally, the AMF further include: processor；

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Alternatively,

The processor is specifically used for:

Optionally, the processor is also used to:

Alternatively,

Obtain the corresponding priority of each SMF+PGW-C.

Optionally, the AMF further include: processor；

Alternatively,

Optionally, the receiver is specifically used for:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

Figure 30 is the structural schematic diagram of SMF+PGW-C example IV provided by the embodiments of the present application, as shown in figure 30, should SMF+PGW-C is included at least: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

Transmitter, for the precedence information to be sent to UDM+HSS or AMF.

Optionally, the also SMF+PGW-C includes: receiver；

Alternatively,

Figure 31 is the structural schematic diagram of UDM+HSS embodiment three provided by the embodiments of the present application, as shown in figure 31, the UDM+ HSS is included at least: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the UDM+HSS:

Optionally, the processor is specifically used for:

Optionally, the UDM+HSS further include: receiver；

Figure 32 is the structural schematic diagram of UDM+HSS example IV provided by the embodiments of the present application, as shown in figure 32, the UDM+ HSS is included at least: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the UDM+HSS:

Optionally, institute UDM+HSS is stated further include:

Figure 33 is the structural schematic diagram of UE embodiment five provided by the embodiments of the present application, which includes at least: for sending The transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the UE:

Optionally, the processor is specifically used for:

Alternatively,

Optionally, the processor is specifically used for:

Alternatively,

Generate first APN corresponding with the S-NSSAI and DNN of the first PDU.

Figure 34 is the structural schematic diagram of SMF+PGW-C embodiment five provided by the embodiments of the present application, as shown in figure 34, should SMF+PGW-C is included at least: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

Transmitter, for sending the address of the APN Yu the SMF+PGW-C to UDM+HSS；

Obtain APN corresponding with the S-NSSAI and DNN.

Optionally, the processor is specifically used for:

Alternatively,

It optionally, include the APN in the PDU session establishment receiving.

Optionally, the transmitter is also used to:

The APN-AMBR corresponding with the APN is sent to the UE；

And/or

The APN-AMBR corresponding with the APN is sent to the UDM+HSS.

Optionally, the processor is specifically used for:

Alternatively,

Optionally, the processor is specifically used for:

Optionally, the first information includes:

The APN-AMBR corresponding with the APN that the SMF+PGW-C is determined；

Alternatively,

The corresponding DNN of the PDU session；

Alternatively,

The corresponding APN of DNN corresponding with the PDU session.

Figure 35 is that the structural schematic diagram of UE embodiment six provided by the embodiments of the present application changes UE and at least wrap as shown in figure 35 It includes: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the UE:

Receiver, the PDN connection response returned for receiving the MME.

Figure 36 be MME embodiment three provided by the embodiments of the present application structural schematic diagram, as shown in figure 25, the MME 90 to Include: less for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the MME:

Transmitter, for sending creation session request to the first SMF+PGW-C；

Figure 37 is the structural schematic diagram of MME example IV provided by the embodiments of the present application, and as shown in figure 26, which includes: For sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the MME:

Transmitter, for sending creation session request to the first SMF+PGW-C；

Figure 38 is the structural schematic diagram of SMF+PGW-C embodiment six provided by the embodiments of the present application, as shown in figure 38, should SMF+PGW-C include: for sending the transmitter of message, the receiver for receiving message, memory and processor.

In the specific implementation of the SMF+PGW-C:

In above-mentioned UE or each network equipment in the specific implementation, the quantity of processor is at least one, for executing Memory storage executes instruction, i.e. computer program.Optionally, memory can also be integrated in inside processor.Optionally, Receiver and transmitter can realize using transceiver, with no restrictions to this this programme.

The application also provides a kind of storage medium, and the storage medium is for storing computer program, the computer program For realizing the session establishing method or session transferring method of the side UE in preceding method embodiment.

The application also provides a kind of storage medium, and the storage medium is for storing computer program, the computer program For realizing the session establishing method or session transferring method of the side AMF in embodiment of the method.

The application also provides a kind of storage medium, and the storage medium is for storing computer program, the computer program For realizing the session establishing method or session transferring method of the side SMF+PGW-C in embodiment of the method.

The application also provides a kind of storage medium, and the storage medium is for storing computer program, the computer program For realizing the session establishing method or session transferring method of the side UDM+HSS in embodiment of the method.

The application also provides a kind of storage medium, and the storage medium is for storing computer program, the computer program For realizing the session transferring method of the side MME in above method embodiment.

In above-mentioned UE or each network side equipment in the specific implementation, it should be understood that processor can be central processing list Member (English: Central Processing Unit, referred to as: CPU), it can also be other general processors, Digital Signal Processing Device (English: Digital Signal Processor, abbreviation: DSP), specific integrated circuit (English: Application Specific Integrated Circuit, referred to as: ASIC) etc..General processor can be microprocessor or the processor It is also possible to any conventional processor etc..Hardware handles can be embodied directly in conjunction with the step of method disclosed in the present application Device executes completion, or in processor hardware and software module combination execute completion.

Realizing all or part of the steps of above-mentioned each method embodiment, this can be accomplished by hardware associated with program instructions. Program above-mentioned can store in a readable access to memory.When being executed, execute includes above-mentioned each method embodiment to the program The step of；And memory (storage medium) above-mentioned include: read-only memory (English: read-only memory, abbreviation: ROM), RAM, flash memory, hard disk, solid state hard disk, tape (English: magnetic tape), floppy disk (English: floppy Disk), CD (English: optical disc) and any combination thereof.

Claims

1. a kind of session establishing method, which is characterized in that the described method includes:

User equipment (UE) sends first message to access and mobile management function to ps domain AMF, and the first message is for establishing agreement Data cell PDU session；Wherein, the first message includes the request of PDU session establishment and precedence information, the priority letter It ceases for indicating the PDU Session Hand-off of the UE request foundation to the priority of 4G communication system；

2. the method according to claim 1, wherein the method also includes:

The corresponding single network slice selection auxiliary information S-NSSAI of the PDU session；

Use the application of the PDU session；

The UE routing strategy URSP that the UE is saved；

3. method according to claim 1 or 2, which is characterized in that the second message further include:

The precedence information for the PDU session that network determines.

4. method according to any one of claims 1 to 3, which is characterized in that the method also includes:

When the UE is moved to 4G communication system from 5G communication system, the UE is according to DNN pairs of the data network title used The precedence information for each PDU session answered determines the first PDU session for being transferred to 4G communication system.

5. according to the method described in claim 4, it is characterized in that, the UE is according to the corresponding each PDU session of the DNN used Precedence information determine and be transferred to the first PDU session of 4G communication system, comprising:

The UE is according to the corresponding precedence information of the corresponding each PDU session of the DNN, by the PDU of wherein highest priority Session is determined as being transferred to the first PDU session of 4G communication system.

6. a kind of session transferring method, which is characterized in that the described method includes:

When user equipment (UE) is moved to 4G communication system from 5G communication system, access is with mobile management function to ps domain AMF to movement Property management entity MME send the information of the corresponding protocol data network PDN connection of the first protocol Data Unit PDU session, it is described The information of PDN connection is that the UE establishes PDN connection for the MME；

Wherein, in multiple PDU sessions of the first PDU session for the UE the first data network title DNN of use established, It is transferred to the PDU session of the highest priority of 4G communication system.

7. according to the method described in claim 6, it is characterized in that, the method also includes:

The AMF receive that the first conversation management functional+protocol data network gateway control plane SMF+PGW-C sends described the The precedence information of one PDU session；

8. the method according to the description of claim 7 is characterized in that the AMF receives described that the first SMF+PGW-C is sent The precedence information of one PDU session, comprising:

In evolved packet system load identification EBI assigning process, the AMF receives the institute that the first SMF+PGW-C is sent State the precedence information of the first PDU session.

9. according to the method described in claim 8, it is characterized in that, the AMF receives described first in EBI assigning process The precedence information for the first PDU session that SMF+PGW-C is sent, comprising:

If the AMF determines to be that the corresponding 2nd PDU session of the first DNN is assigned with EBI, and the 2nd PDU Corresponding 2nd SMF+PGW-C of session is different from the first SMF+PGW-C, then judges that the priority of the first PDU session is The no priority higher than the 2nd PDU session；

Alternatively,

If the AMF determines to be that the corresponding 3rd PDU session of the first DNN is assigned with EBI, and the 3rd PDU Session corresponds to the first SMF+PGW-C, then the AMF is that the first PDU session distributes EBI；

Alternatively,

If the AMF determines locally to have saved corresponding 2nd SMF+PGW-C of the first DNN, and the first SMF+PGW-C Corresponding priority is higher than the corresponding priority of the 2nd SMF+PGW-C, then the AMF is the first PDU session distribution EBI；

Alternatively,

If the AMF determines that corresponding first SMF+PGW-C of the first DNN, the AMF are the first PDU session point With EBI.

10. according to the method described in claim 9, it is characterized in that, the EBI distribution request includes the first PDU session Mark, which comprises

11. according to the method described in claim 9, it is characterized in that, the method also includes:

The AMF selects the priority of auxiliary information S-NSSAI according to the corresponding single network slice of SMF+PGW-C of preservation, Determine the corresponding priority of the first SMF+PGW-C and the corresponding priority of the 2nd SMF+PGW-C；

Alternatively,

The AMF obtains the corresponding priority of each SMF+PGW-C.

12. according to the described in any item methods of claim 6 to 11, which is characterized in that the method also includes:

The AMF sends the information of the corresponding PDN connection of the 4th PDU session to the MME, the 4th PDU session with it is described First PDU session uses identical DNN and SMF+PGW-C.

13. according to the described in any item methods of claim 6 to 12, which is characterized in that the method also includes:

The AMF requests the first PDU session corresponding described to corresponding first SMF+PGW-C of the first PDU session The information of PDN connection；

Alternatively,

The AMF requests the first PDU session corresponding described to corresponding first SMF+PGW-C of the first PDU session The information of PDN connection, and obtain the information of the corresponding PDN connection of other PDU sessions using the first DNN.

14. according to the method described in claim 8, it is characterized in that, the AMF receives what the first SMF+PGW-C was sent The precedence information of the first PDU session, comprising:

It is right that the AMF receives the corresponding default quality of service rule of the first PDU session that the first SMF+PGW-C is sent The distribution answered keeps priority ARP, or,

The AMF receives the priority for the corresponding S-NSSAI of the first PDU session that the first SMF+PGW-C is sent, Or,

15. the method according to the description of claim 7 is characterized in that the precedence information that the received UE of the AMF is sent, packet It includes:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

16. a kind of session establishing method, which is characterized in that the described method includes:

Protocol Data Unit of conversation management functional+protocol data network gateway control plane SMF+PGW-C in user equipment (UE) During PDU session establishment, the PDU Session Hand-off of the UE is obtained to the precedence information of 4G communication system；

The SMF+PGW-C by the precedence information be sent to uniform data management+home subscribed services device UDM+HSS or Access and mobile management function to ps domain AMF.

17. according to the method for claim 16, which is characterized in that

The precedence information is priority of the PDU Session Hand-off that sends of the received UE to 4G communication system；

Alternatively,

The precedence information is the SMF+PGW-C according to the single network of PDU session slice selection auxiliary information S- NSSAI determine the PDU Session Hand-off to 4G communication system priority；

Alternatively,

The precedence information is the PDU meeting that the SMF+PGW-C is determined according to the S-NSSAI and DNN of the PDU session Words are transferred to the priority of 4G communication system.

18. a kind of session transferring method, which is characterized in that the described method includes:

The protocol Data Unit PDU session for the user equipment (UE) that uniform data management+home subscribed services device UDM+HSS is saved The address of the data network title DNN, conversation management functional+protocol data network gateway control plane SMF+PGW-C that use and The corresponding relationship of priority；Wherein, priority is used to indicate the corresponding 4G that is transferred to of the corresponding PDU session of SMF+PGW-C and communicates The priority of system, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

The UDM+HSS is according to the priority of preservation, with determining the UE the first SMF+PGW-C used in 4G communication system Location；

The UDM+HSS sends the first address SMF+PGW-C and access point name APN to mobility management entity MME； Wherein, the APN is corresponding with the DNN.

19. according to the method for claim 18, which is characterized in that it is described according to the priority, determine the UE in 4G First address SMF+PGW-C used in communication system, comprising:

The UDM+HSS determines in the corresponding all SMF+PGW-C of the DNN that the address of the SMF+PGW-C of highest priority is made For the first address SMF+PGW-C.

20. according to the method for claim 18, which is characterized in that the method also includes:

The UDM+HSS determines whether to save the corresponding pass between other corresponding SMF+PGW-C of the DNN and priority System；

If so, the UDM+HSS judges whether the corresponding priority of the SMF+PGW-C is higher than described DNN pairs saved The corresponding priority of other described SMF+PGW-C answered；

21. 8 to 20 described in any item methods according to claim 1, which is characterized in that described DNN, SMF+PGW-C and preferential The corresponding relationship of grade, comprising:

The corresponding pass of APN corresponding with DNN, single network slice selection auxiliary information S-NSSAI, SMF+PGW-C and priority System；Alternatively,

22. a kind of session transferring method, which is characterized in that the described method includes:

The protocol Data Unit PDU session for the user equipment (UE) that uniform data management+home subscribed services device UDM+HSS is saved It is transferred to access point name APN, conversation management functional used in 4G communication system+protocol data network gateway control plane The address of SMF+PGW-C and the corresponding relationship of priority；Wherein, priority is used to indicate the corresponding PDU session pair of SMF+PGW-C That answers is transferred to the priority of 4G communication system, alternatively, the priority, which is used to indicate SMF+PGW-C, is transferred to 4G communication system Priority；

The UDM+HSS sends the first address SMF+PGW-C and the first SMF+ to mobility management entity MME The corresponding APN in the address PGW-C.

23. according to the method for claim 22, which is characterized in that the UDM+HSS determines institute according to the priority of preservation State the first address SMF+PGW-C used in 4G communication system UE, comprising:

The UDM+HSS is according to the corresponding relationship, in the SMF+PGW-C for determining preservation, the SMF+PGW-C's of highest priority Address is as the first address SMF+PGW-C.

24. according to the method for claim 22, which is characterized in that the method also includes:

The UDM+HSS determines local other corresponding SMF+PGW-C of the corresponding DNN of the APN and preferential of whether saving Corresponding relationship between grade；

25. according to the described in any item methods of claim 22 to 24, which is characterized in that described APN, SMF+PGW-C and preferential The corresponding relationship of grade, comprising:

26. a kind of user equipment (UE), which is characterized in that the described method includes:

Sending module, for sending first message to access and mobile management function to ps domain AMF, the first message is for establishing association Discuss data cell PDU session；Wherein, the first message includes the request of PDU session establishment and precedence information, the priority Information is used to indicate the PDU Session Hand-off of the UE request foundation to the priority of 4G communication system；

27. UE according to claim 26, which is characterized in that the UE further include:

Use the application of the PDU session；

The UE routing strategy URSP that the UE is saved；

28. the UE according to claim 26 or 27, which is characterized in that the second message further include: the institute that network determines State the precedence information of PDU session.

29. according to the described in any item UE methods of claim 26 to 28, which is characterized in that the UE further include: processing module is used It is corresponding each according to the data network title DNN used in when the UE is moved to 4G communication system from 5G communication system The precedence information of PDU session determines the first PDU session for being transferred to 4G communication system.

30. UE according to claim 29, which is characterized in that the processing module is specifically used for:

It is according to the corresponding precedence information of the corresponding each PDU session of the DNN, the PDU session of wherein highest priority is true It is set to the first PDU session for being transferred to 4G communication system.

31. a kind of access and mobile management function to ps domain AMF, which is characterized in that the AMF includes:

Sending module, for when user equipment (UE) is moved to 4G communication system from 5G communication system, to mobility management entity MME sends the information of the corresponding protocol data network PDN connection of the first protocol Data Unit PDU session, the letter of the PDN connection Breath is that the UE establishes PDN connection for the MME；

32. AMF according to claim 31, which is characterized in that the AMF further include: receiving module is used for:

Receive the first PDU meeting of the first conversation management functional+protocol data network gateway control plane SMF+PGW-C transmission The precedence information of words；

33. AMF according to claim 32, which is characterized in that the receiving module is specifically used for:

In EBI assigning process, the precedence information for the first PDU session that the first SMF+PGW-C is sent is received.

34. AMF according to claim 33, which is characterized in that the AMF further include: processing module；

The processing module is specifically used for:

If it is determined that being that the corresponding 2nd PDU session of the first DNN is assigned with EBI, and the 2nd PDU session is corresponding 2nd SMF+PGW-C is different from the first SMF+PGW-C, then judges whether the priority of the first PDU session is higher than institute State the priority of the 2nd PDU session；

If the priority of the first PDU session is higher than the priority of the 2nd PDU session, for the first PDU session Distribute evolved packet system load identification EBI；

Alternatively,

The processing module is specifically used for:

If it is determined that being that the corresponding 3rd PDU session of the first DNN is assigned with EBI, and the 3rd PDU session is corresponding First SMF+PGW-C then distributes EBI for the first PDU session；

Alternatively,

The processing module is specifically used for:

If it is determined that local saved corresponding 2nd SMF+PGW-C of the first DNN, and the first SMF+PGW-C is corresponding Priority is higher than the corresponding priority of the 2nd SMF+PGW-C, then distributes EBI for the first PDU session；

Alternatively,

The processing module is specifically used for:

35. AMF according to claim 34, which is characterized in that the EBI distribution request includes the first PDU session Mark, the processing module is also used to determine the first PDU session corresponding according to the mark of the first PDU session One DNN.

36. AMF according to claim 34, which is characterized in that the processing module is also used to:

The priority of the corresponding single network slice selection auxiliary information S-NSSAI of the SMF+PGW-C of preservation, determines described first The corresponding priority of SMF+PGW-C and the corresponding priority of the 2nd SMF+PGW-C；

Alternatively,

Obtain the corresponding priority of each SMF+PGW-C.

37. according to the described in any item AMF of claim 31 to 36, which is characterized in that the sending module is also used to described MME sends the information of the corresponding PDN connection of the 4th PDU session, and the 4th PDU session uses phase with the first PDU session Same DNN and SMF+PGW-C.

38. according to the described in any item AMF of claim 31 to 37, which is characterized in that the AMF further include: processing module；

The processing module is used to obtain the first PDU of highest priority in the corresponding multiple PDU sessions of the first DNN Session；

The sending module is also used to request the first PDU session to corresponding first SMF+PGW-C of the first PDU session The information of the corresponding PDN connection；

Alternatively,

The sending module is also used to request the first PDU session to corresponding first SMF+PGW-C of the first PDU session The information of the corresponding PDN connection, and obtain the letter of the corresponding PDN connection of other PDU sessions using the first DNN Breath.

39. AMF according to claim 33, which is characterized in that the receiving module is specifically used for:

It is corresponding point of default quality of service rule corresponding to receive the first PDU session that the first SMF+PGW-C is sent With holding priority ARP, or,

40. AMF according to claim 32, which is characterized in that the priority letter that the received UE of receiving module is sent Breath, comprising:

The priority of the corresponding S-NSSAI of the PDU session；Alternatively,

Use the priority of the application of the PDU session.

41. a kind of conversation management functional+protocol data network gateway control plane SMF+PGW-C, which is characterized in that the SMF+ PGW-C includes:

Processing module, for obtaining the PDU of the UE during protocol Data Unit PDU session establishment of user equipment (UE) Session Hand-off to 4G communication system precedence information；

Sending module, for by the precedence information be sent to uniform data management+home subscribed services device UDM+HSS or Access and mobile management function to ps domain AMF.

42. SMF+PGW-C according to claim 41, which is characterized in that the also SMF+PGW-C includes: receiving module；

The precedence information is the PDU Session Hand-off that sends of the received UE of the receiving module to 4G communication system Priority；

Alternatively,

The precedence information is the processing module according to the single network of PDU session slice selection auxiliary information S- NSSAI determine the PDU Session Hand-off to 4G communication system priority；

Alternatively,

The precedence information is the PDU meeting that the processing module is determined according to the S-NSSAI and DNN of the PDU session Words are transferred to the priority of 4G communication system.

43. a kind of uniform data management+home subscribed services device UDM+HSS, which is characterized in that the UDM+HSS includes:

Memory module, data network title DNN that the protocol Data Unit PDU session of the user equipment (UE) for preservation uses, The address of conversation management functional+protocol data network gateway control plane SMF+PGW-C and the corresponding relationship of priority；Wherein, Priority is used to indicate the corresponding priority for being transferred to 4G communication system of the corresponding PDU session of SMF+PGW-C, alternatively, described Priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module, with according to the priority of preservation, not determining the UE the first SMF+PGW-C used in 4G communication system Address；

Sending module, for sending the first address SMF+PGW-C and access point name to mobility management entity MME APN；Wherein, the APN is corresponding with the DNN.

44. UDM+HSS according to claim 43, which is characterized in that the processing module is specifically used for:

It determines in the corresponding all SMF+PGW-C of the DNN, the address of the SMF+PGW-C of highest priority is as the first SMF+ The address PGW-C.

45. UDM+HSS according to claim 43, which is characterized in that the UDM+HSS further include: receiving module；

The processing module is also used to determine whether to save between other corresponding SMF+PGW-C of the DNN and priority Corresponding relationship；

If so, the processing module is also used to judge whether the corresponding priority of the SMF+PGW-C is higher than the institute saved State the corresponding priority of other corresponding described SMF+PGW-C of DNN；

If so, the memory module saves the address of the SMF+PGW-C and the corresponding relationship of the priority.

46. according to the described in any item UDM+HSS of claim 43 to 45, which is characterized in that described DNN, SMF+PGW-C and excellent The corresponding relationship of first grade, comprising:

47. a kind of uniform data management+home subscribed services device UDM+HSS, which is characterized in that the UDM+HSS includes:

Memory module, for saving used in the protocol Data Unit PDU Session Hand-off to 4G communication system of user equipment (UE) The address of access point name APN, conversation management functional+protocol data network gateway control plane SMF+PGW-C and priority Corresponding relationship；Wherein, priority is used to indicate that the corresponding PDU session of SMF+PGW-C is corresponding to be transferred to the excellent of 4G communication system First grade, alternatively, the priority is used to indicate the priority that SMF+PGW-C is transferred to 4G communication system；

Processing module determines the UE the first SMF+PGW-C used in 4G communication system for the priority according to preservation Address；

Sending module, for sending the first address SMF+PGW-C and the first SMF+ to mobility management entity MME The corresponding APN in the address PGW-C.

48. UDM+HSS according to claim 47, which is characterized in that the processing module is specifically used for according to described right It should be related to, determine in the SMF+PGW-C saved, the address of the SMF+PGW-C of highest priority is as the first SMF+PGW-C Location.

49. UDM+HSS according to claim 47, which is characterized in that institute UDM+HSS is stated further include:

The processing module, for determine it is local whether save other corresponding SMF+PGW-C of the corresponding DNN of the APN with And the corresponding relationship between priority；

If so, processing module is also used to judge whether the corresponding priority of the SMF+PGW-C is higher than the DNN saved The corresponding priority of other corresponding described SMF+PGW-C；

50. according to the described in any item UDM+HSS of claim 47 to 49, which is characterized in that described APN, SMF+PGW-C and excellent The corresponding relationship of first grade, comprising: