CN111356184A - Method and system for transferring session in interoperation process of 5G and LTE - Google Patents

Method and system for transferring session in interoperation process of 5G and LTE Download PDF

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CN111356184A
CN111356184A CN201811563231.8A CN201811563231A CN111356184A CN 111356184 A CN111356184 A CN 111356184A CN 201811563231 A CN201811563231 A CN 201811563231A CN 111356184 A CN111356184 A CN 111356184A
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session
transfer
list
network
qos flow
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CN111356184B (en
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金逸
陈伟
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method and a system for transferring a session in the interoperation process of 5G and LTE, wherein the method comprises the following steps: and triggering the interoperation between the 5G and the LTE, and transferring at least one session between the 5G corresponding network and the LTE corresponding network through the session transfer request message and the EPS bearing activation message or the session transfer request message and the QoS Flow activation message in the interoperation process. The invention can accelerate the session transfer process by reducing signaling or simplifying the transfer flow, thereby improving the service continuity.

Description

Method and system for transferring session in interoperation process of 5G and LTE
Technical Field
The invention relates to the technical field of 5G and LTE (Long term evolution) interoperation, in particular to a method and a system for transferring a session in the interoperation process of 5G and LTE.
Background
Currently, the concept of registration mode is newly introduced in the process of the 5G protocol being established, wherein for the interoperation between 5GS and EPS. The registration mode in 5G is divided into a single registration mode and a double registration mode, wherein the UE maintains a single registration state in 5GS and EPS in the single registration mode, and the UE maintains independent registration states in 5GS and EPS in the double registration mode. In 5G, an N26 interface is used for interoperation between the 5GC and the EPC, and an N26 interface is used for an interface between an AMF (Authentication Management Function) and an MME (Mobile Management Entity) to transmit context during interoperation. Even without an N26 interface between the AMF and the MME, the 5G protocol provides for maintaining IP address continuity (IP address does not change) at the time of interoperation, when the 5GC and EPC interwork the context of the session by obtaining the information stored in the UDM + HSS.
In the dual registration mode, in the EPS and 5GS coverage areas, the UE can simultaneously register to the EPC and 5GC, and the registration on the two core networks is independent of each other. The dual registration mode UE must support the feature "EPS Attach with out pdnconnection" so that registration (early registration) can be performed before interworking. If registered simultaneously in dual registration mode, the UE may place a portion of the session on the EPS and a portion of the session on the 5 GS.
In dual registration mode or single registration without N26 interface, the UE needs to transfer the originating session from EPS to coverage area 5GS or from coverage area 5GS to EPS, for example: from 5GS to an EPS coverage area, UE transfers PDU Session in 5GS to PDN Connection in EPS; and from the EPS to the coverage area of 5GS, the UE transfers the PDN Connection in the EPS to PDU Session in 5 GS. One purpose of session transfer is to keep the IP address unchanged, and to maintain service continuity as much as possible, thereby improving user experience.
When transferring session, UE and core network do NAS (network access server) signaling interaction to complete the transferring process. Assume that the UE is registered in dual registration mode and in the EPC in advance, taking as an example the interoperation from 5GS to EPS and transfer of IMS session: UE firstly initiates a PDN connection establishing process, establishes a default bearer for bearing IMS signaling; then, the network side initiates a dedicated bearer activation flow, and activates 2 dedicated bearers, which are respectively used for carrying the IMS voice and the IMS video. The process is as follows:
1): UE sends PDN CONNECTIVITY REQUEST message carrying type identification (Handover) and APN (IMS) to indicate network to carry out IMS session transfer operation.
2): the network sends an ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST message instructing the UE to ACTIVATE a DEFAULT BEARER for carrying IMS signaling. The message carries bearer parameters: EPS bearer ID, QoS (bearer quality of service parameters), PDN address (IP address allocated by IMS for UE), and so on.
3): the UE acknowledges activation of the default BEARER and sends ACTIVATE DEDICATED EPS BEARER context request message.
4): the network sends ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST message instructing the UE to activate a dedicated BEARER for carrying the IMS voice.
5): the UE acknowledges activation of the IMS voice dedicated bearer and sends ACTIVATE DEDICATED EPS bearer ACCEPT message.
6): the network sends ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST message instructing the UE to activate a dedicated BEARER for carrying IMS video.
7): the UE acknowledges activation of the IMS video dedicated bearer and sends an ACTIVATE DEDICATED EPS bearer ACCEPT message.
Because the signaling interaction process for transferring one session according to the above process requires seven steps in total, if a plurality of sessions of the UE need to be transferred from 5GS to EPS, signaling interaction will be multiplied, resulting in large signaling overhead and poor session transfer effect.
Disclosure of Invention
The method and the system for transferring the session in the interoperation process of the 5G and the LTE can accelerate the session transfer process by reducing signaling or simplifying the transfer process, thereby improving service continuity.
In a first aspect, the present invention provides a method for transferring a session in an interworking process between 5G and LTE, including:
and triggering the interoperation between the 5G and the LTE, and transferring at least one session between the 5G corresponding network and the LTE corresponding network through the session transfer request message and the EPS bearing activation message or the session transfer request message and the QoS Flow activation message in the interoperation process.
Alternatively, when transferring a session from the 5GS to the EPC,
carrying a session transfer request and EPS bearing activation signaling by the ATTACH ATTACH request message to transfer at least one session from the 5GS to the EPC;
alternatively, the SESSION TRANSFER NOTIFICATION message is carried by the ATTACH request message to TRANSFER at least one SESSION from the 5GS to the EPC.
Alternatively, when transferring the session from the EPC to the 5GS,
carrying DNN, PDN Session ID and QoS Flow activation message by the Session transfer request to transfer at least one Session from EPC to 5 GS;
or the SESSION TRANSFER NOTIFICATION message carries the DNN and the PDU SESSION ID, or the SESSION TRANSFER NOTIFICATION message carries the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID correspondence list and the SESSION TRANSFER list to TRANSFER at least one SESSION from the EPC to the 5 GS.
Optionally, the carrying, by the ATTACH request message, the session transfer request and the EPS bearer activation signaling to transfer the at least one session from the 5GS to the EPC includes:
UE triggers ATTACH flow, and UE sends ATTACHRREQUEST message carrying session transfer request to inform network to transfer session; the Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session;
after receiving a session transfer request message sent by the UE, the network acquires a session corresponding to each APN in the session transfer request, and sends ATTACH ACCEPT messages carrying an EPS bearer activation signaling to the UE, where the ATTACHACCEPT message includes a bearer list transferable to the EPC;
after receiving the EPS bearing activation signaling, the UE establishes EPS bearings in an EPC one by one and deletes the source session from the 5 GC;
the UE sends an ATTACH COMPLETE message to COMPLETE the ATTACH procedure.
Optionally, the step of carrying, by the ATTACH request message, a SESSION transfer notification message to transfer at least one SESSION from the 5GS to the EPC includes:
the method comprises the steps that UE triggers an ATTACH Flow, the UE sends an ATTACHREQUEST message carrying SESSION TRANSFER NOTIFICATION to inform a network of transferring SESSIONs, wherein the SESSION TRANSFER NOTIFICATION carries a second SESSION list and at least one QoS Flow with standard QCI attributes, and the second SESSION list comprises APNs of all SESSIONs and PDU SESSION ID information enabling the network to associate a source SESSION and a target SESSION; or the SESSION TRANSFER NOTIFICATION carries a third SESSION list, where the third SESSION list includes an APN of each SESSION, so that the network associates PDU SESSION IDs of a source SESSION and a target SESSION and a mapping relationship list between QoS Flow IDs and EPS Bearer IDs;
after receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires a SESSION corresponding to each APN in the SESSION sfer NOTIFICATION and converts QoSFlow of a standard QCI attribute in each SESSION into a corresponding EPS bearer; then the network replies ATTACH ACCEPT message carrying session transfer list; or acquiring the SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION, converting the QoS Flow of each SESSION into a corresponding EPS bearer according to the mapping relation, and replying ATTACH ACCEPT messages by the network;
UE sends ATTACH COMPLETE message to COMPLETE ATTACH flow;
when the session to be transferred has both the QoS Flow with the standard QCI attribute and the QoS Flow with the non-standard QCI attribute, the network side initiates a special bearer activation Flow after the attachment Flow is completed, and establishes the bearer with the non-standard QCI attribute;
and when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and maintains the IP address unchanged.
Optionally, the transferring, by the session transfer request, the DNN, the PDN session ID, and the QoS Flow activation message to transfer the at least one session from the EPC to the 5GS includes:
UE initiates a 5GS registration process and sends a Session transfer request message to transfer at least one Session from EPC to 5GS, wherein the Session transfer request message carries DNN and PDU Session ID generated by the UE;
the network indexes the source Session information from PGW-C + SMF through PDU Session ID, and generates corresponding QoS Flow for EPS load-bearing in the Session; and then sending a QoS Flow activation message to the UE to activate QoS Flow of each Session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list comprises one or any combination of QoS rule, or PDSUSSAI, or PDU address, or Selected PDU Session Type, or Selected SSC mode, or Selected S-NSSAI, or Selected DNN, or Selected AMBR, or EPCO.
Optionally, the transferring the DNN, the PDU SESSION ID, or the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the SESSION list carried by the SESSION TRANSFER NOTIFICATION message to TRANSFER the at least one SESSION from the EPC to the 5GS includes:
UE sends session NOTIFICATION message carrying DNN, PDU session ID and at least one of session with standard QCI attribute bearer; or the UE sends a Session TRANSFER NOTIFICATION message carrying the DNN, the PDU Session ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth Session list, and notifies the network to TRANSFER the Session;
after obtaining the message of the session transfer list, the UE transfers and deletes the session in the EPS according to the QoS Flow ID in the session transfer list; or after receiving the sending completion confirmation of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list;
the network side initiates a PDU Session Modification Flow and establishes a QoS Flow of a non-standard QCI attribute;
and when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and keeps the IP address unchanged.
In a second aspect, the present invention provides a system for transferring a session in an interworking process between 5G and LTE, comprising:
the system comprises a request unit, a processing unit and a processing unit, wherein the request unit is used for sending a session transfer request message to a network by UE and initiating session transfer, and the network comprises a 5G corresponding network or an LTE corresponding network;
an activating unit, configured to send, by the network, an EPS bearer activation message or a QoS Flow activation message to the UE, so as to transfer at least one session between the 5G corresponding network and the LTE corresponding network.
Optionally, the request unit includes:
a first REQUEST module, configured to trigger an ATTACH procedure by the UE, and send an ATTACH REQUEST message carrying a session transfer REQUEST by the UE, to notify the network of transferring a session; the Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session;
or, the second REQUEST module is configured to trigger an ATTACH Flow by the UE, and the UE sends an ATTACH REQUEST message carrying SESSION transfer notification to notify the network of SESSION transfer, where the SESSION transfer notification carries a second SESSION list and at least one QoS Flow having a standard QCI attribute, and the second SESSION list includes an APN of each SESSION and PDU SESSION ID information for associating a source SESSION with a target SESSION by the network; or the SESSION transport carries a third SESSION list, where the third SESSION list includes an APN of each SESSION, so that the network associates PDU SESSION IDs of a source SESSION and a target SESSION and a mapping relationship list between QoS Flow IDs and EPS Bearer IDs;
or, a third request module, configured to initiate a 5GS registration procedure by the UE, and send a session transfer request message to transfer at least one session from the EPC to the 5GS, where the session transfer request message carries the DNN and the pdusessid generated by the UE;
or, the fourth request module is configured to send a SESSION TRANSFER NOTIFICATION message carrying the DNN, the PDU SESSION ID, and at least one of the SESSIONs that has a standard QCI attribute bearer by the UE; or the UE sends a SESSION transport notification message carrying the DNN, the PDScess ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list, and notifies the network to transfer the SESSION.
Optionally, the activation unit comprises:
a first activation module, configured to, after receiving a session transfer request message sent by a UE, a network obtain a session corresponding to each APN in the session transfer request, and send, to the UE, an ATTACH ACCEPT message carrying an EPS bearer activation signaling, where the ATTACH ACCEPT message includes a bearer list that can be transferred to an EPC;
or, the second activation module is configured to, after receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires a SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION and converts a QoS Flow having a standard QCI attribute in each SESSION into a corresponding EPS bearer; then the network replies ATTACHACCEPT message carrying session transfer list; or acquiring the SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION, converting the QoS Flow of each SESSION into a corresponding EPS bearer according to the mapping relation, and replying ATTACH ACCEPT messages by the network;
or, the third activation module is configured to index, by the network, source Session information from the PGW-C + SMF through the PDU Session ID, and generate a corresponding QoS Flow for an EPS bearer in the Session; then sending a QoS Flow activation message to UE to activate QoS Flow of each Session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list contains one or any combination of QoS rule, PDU Session ID, PDU address, Selected PDU Session Type, Selected SSC mode, Selected S-NSSAI, Selected DNN, Selected AMBR and EPCO;
or, the fourth activation module is configured to transfer and delete the session in the EPS according to the QoS Flow ID in the session transfer list after the UE acquires the session transfer list message; or after receiving the sending completion confirmation of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list.
According to the method and the system for transferring the session in the interoperation process of the 5G and the LTE, provided by the embodiment of the invention, in the prior art, when the UE registers in the EPC in advance in the dual-registration mode and interoperates from the 5GS to the EPS and transfers the IMS session: UE firstly initiates a PDN connection establishing process, establishes a default bearer for bearing IMS signaling; then, the network side initiates a dedicated bearer activation Flow, activates 2 dedicated bearers, which are respectively used for carrying IMS voice and IMS video, that is, session transfer is performed through the multiple signaling interaction flows, and especially, when the UE has multiple sessions that need to be transferred from 5GS to EPS, the experience of the user is seriously affected, therefore, in the interoperation process of 5G and LTE, the method can accelerate the session transfer process by reducing the signaling or simplifying the transfer Flow through the session transfer request message and the EPS bearer activation message, or the session transfer request message and the QoS Flow activation message transfer session, thereby improving service continuity and obtaining better user experience.
Drawings
Fig. 1 is a flowchart of a method for transferring a session in an interworking process between 5G and LTE according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for transferring a session from a 5GS to an EPC according to another embodiment of the present invention;
FIG. 3 is a flow chart of a method for transferring a session from a 5GS to an EPC according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for transferring a session from an EPC to a 5GS according to another embodiment of the present invention;
FIG. 5 is a flow chart of a method for transferring a session from an EPC to a 5GS according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a system for transferring a session in an interworking process between 5G and LTE according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for transferring a session in an interworking process between 5G and LTE, where as shown in fig. 1, the method includes:
and triggering the 5G and LTE interoperation, and transferring at least one session between the 5G corresponding network and the LTE corresponding network through the session transfer request message and the EPS bearing activation message or the session transfer request message and the QoS (Quality of Service) Flow activation message in the interoperation process.
In the method for transferring a session in an interworking process between 5G and LTE (Long Term Evolution ) provided in the embodiments of the present invention, since the UE is registered in the EPC in advance in the dual registration mode in the prior art, when an IMS (IP multimedia subsystem) session is transferred from the interworking of 5GS (5G System, which includes a 5G access network, a core network, and a terminal) to EPS (Evolved Packet System, which includes an LTE access network, a core network, and a terminal): UE initiates a PDN (Public Data Network) connection establishment flow to establish a default bearer for bearing IMS signaling; then, the network side initiates an activate dedicated bearer Flow, activates 2 dedicated bearers, which are respectively used to carry the IMS voice and the IMS video, that is, session transfer is performed through the multiple signaling interaction flows, and especially, when the UE has multiple sessions that need to be transferred from the 5GS to the EPS, the experience of the user is seriously affected, therefore, in the interoperation process of the 5G and the LTE, the session transfer process can be accelerated by reducing the signaling or simplifying the transfer Flow through the session transfer request message and the EPS bearer activation message, or the session transfer request message and the QoS Flow activation message transfer session, thereby improving service continuity and obtaining better user experience.
In the first embodiment, the first step is,
as shown in fig. 2, when transferring a session from 5GS to EPC, the ATTACH request message carries a session transfer request and EPS bearer activation signaling to transfer at least one session from 5GS to EPC, that is, the session transfer signaling is merged to reduce delay, thereby improving efficiency of session transfer, ensuring continuity of service, and effectively improving user experience; wherein, the UE operates in a dual registration mode or a single registration mode without an N26 interface, initially registers in 5GS, and enters an EPS coverage area. When the signal of the 5GS is gradually decreased and the signal of the EPS is gradually increased, the interworking from the 5GS to the EPS on the UE side is triggered, and in addition, when there is no N26 interface, according to the specification of the 5G protocol, when the interworking from the 5GS to the EPS, the present embodiment mainly relates to the UE initiating the ATTACH procedure.
Meanwhile, in the process of interoperation from 5GS to EPS, the UE needs to TRANSFER all or part of SESSIONs in 5GC (5G Core network: 5G Core network) to EPC (Evolved Packet Core: LTE Core network), in the method described in this embodiment, in the process of registration, the UE TRANSFERs all SESSIONs to be transferred to EPC mainly by sending ATTACH REQUEST message carrying SESSION TRANSFER REQUEST (SESSION TRANSFER REQUEST) by UE, after receiving the SESSION TRANSFER REQUEST message, network responds to ATTACH ACCEPT message carrying EPS BEARER activation signaling (ACTIVATE EPS BEARER), after receiving ATTACH ACCEPT message, UE deletes all SESSIONs in 5GC and reestablishes corresponding EPS BEARER (BEARER) in EPC, where SESSION (SESSION): depending on the context, PDN Connection, i.e. an IP Connection between the UE and the PDN, is referred to if EPS. If the data is 5GS, the PDU Session is a data connection between the UE and the DN, and the specific steps are as follows:
1): the UE initially operates in a dual-registration mode or a single-registration non-N26 interface and triggers an interoperation from 5GC to EPC;
2): when the 5GS to EPS interoperation occurs, the UE triggers the ATTACH procedure. UE sends ATTACH REQUEST message carrying SESSIONTRANSFER REQUEST to inform network to transfer session; if the mode is the dual registration mode, the UE may choose to transfer only part of the session, and the attach request message carries only the session that needs to be transferred to the EPS. The Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session; in addition, when there are a plurality of PDU SESSIONs under the same DNN, the PDN connections are arranged in the sequence of PDU Session IDs from small to large in the Session TRANSFER REQUEST message.
3): after receiving a SESSION TRANSFER REQUEST message sent by the UE, the network acquires SESSIONs corresponding to APNs in the SESSION TRANSFER REQUEST one by one, and sends a ATTACH ACCEPT message carrying ACTIVATE EPS BEARER to the UE, wherein the ATTACH ACCEPT message contains a BEARER list transferable to the EPC; the bearer list includes the following parameters:
the bearing type is as follows: identifying as a default bearer or a dedicated bearer;
APN (Access Point Name: Access Point Name): the default bearer carries the parameter, the access point of the conversation;
PDN address: the default load carries the parameter, and the IP address allocated by the session for the UE is the same as the IP address allocated by the source session for the UE in the 5 GC;
EPS bearer ID: carrying ID identification;
linked EPS bearer ID: a default bearer ID to which the dedicated bearer is associated;
QoS (quality of service): a quality of service attribute parameter;
a TFT: a carried packet filter;
other parameters also include one or any combination of PCO (Point of Control and Observation: Control Observation Point), APN-AMBR (Aggregate Maximum Bit Rate), etc. In addition: the detailed message parameter contents may refer to the respective corresponding fields of the ACTIVATED EFAULT/DEDICATED EPS BEAREQUEST message in the 24.301 protocol.
Meanwhile, after receiving the ACTIVATE EPS BEARER message, the UE establishes EPS BEARERs in the EPC one by one, and deletes the source session from the 5 GC. Wherein, the air interface Radio resource (DRB) corresponding to each bearer is established by RRC (Radio resource control) connection reconfiguration message, and one RRC connection reconfiguration message carries all DRB parameters (EPS bearer to be established).
4): the UE sends an ATTACH COMPLETE message to the network and COMPLETEs the ATTACH procedure.
Or, as shown in fig. 3, when the session is transferred from the 5GS to the EPC, the session ATTACH request message carries the session NOTIFICATION message to transfer at least one session from the 5GS to the EPC, that is, when the session includes a QoS Flow including at least one standard QCI attribute, the QoS Flow conversion Flow of the standard QCI attribute is simplified to achieve the effect of reducing delay, improving service continuity, and greatly improving user experience. Wherein the protocol defines a set of standard QCI values in order for all operators to understand some specific type of QoS attributes. For example: QCI is 1 for voice calls, 2 for video calls and 5 for carrying IMS signalling. QoS attributes of standard QCI: the delay, packet loss rate, etc. are predefined and may not need to be assigned by the network. Thus, from 5GS to EPS there is no interoperation of N26 interfaces, if there is only a standard QCI QoS Flow or there is no requirement for traffic continuity in the actual scenario for these QoS flows although there are also non-standard QCI QoS flows (flows): a typical example is that the UE establishes two PDN connections, Internet and IMS, where the Internet connection is not sensitive to service continuity, and the IMS has a requirement for call continuity, but it is a standard QCI QoS Flow (IMS signaling QCI is 5, IMS voice call QCI is 1, and IMS video call QCI is 2). In interoperation, the transfer of a session from the 5GS to the EPC proceeds as follows:
1): the UE initially operates in a double-registration mode or a single-registration non-N26 interface and triggers interoperation from 5GS to EPS;
2a) the method comprises the following steps When 5 GS-to-EPS interoperation occurs, the UE sends an ATTACH REQUEST message carrying SESSION TRANSFER NOTIFICATION to inform the network of SESSION TRANSFER, if the mode is a dual registration mode, the UE can select to TRANSFER only part of the SESSION, and the ATTACH REQUEST message only carries the SESSION to be transferred to the EPS. The SESSION transport SESSION carries a second SESSION list and at least one QoS Flow with standard QCI attribute, wherein the second SESSION list comprises APNs of all SESSIONs and PDU SESSION ID information for enabling a network to associate a source SESSION and a target SESSION; in addition, the session carried in the ATTACH REQUEST message at least contains a standard QCI QoS Flow, and the network uses the pdusesion ID to associate the source session and the target session.
2b) The method comprises the following steps When 5 GS-to-EPS interoperation occurs, the UE sends an ATTACH REQUEST message carrying SESSION TRANSFER NOTIFICATION to inform the network of SESSION TRANSFER, if the mode is a dual registration mode, the UE can select to TRANSFER only part of the SESSION, and the ATTACH REQUEST message only carries the SESSION to be transferred to the EPS. The SESSION transport carries a third SESSION list, wherein the third SESSION list comprises an APN of each SESSION so that the network associates PDU Session IDs of a source SESSION and a target SESSION and a mapping relation list between QoS Flow IDs and EPS Bearer IDs; the mapping relation list is generated by the UE, defines the correspondence between QoS Flow and EPS Bearer, and only includes QoS Flow of standard QCI attribute. The network uses PDU Session ID to associate the source Session and the target Session, and uses the mapping relation between QoS Flow ID and EPS Bearer ID to transfer the EPS Bearer in the Session;
3a) the method comprises the following steps After receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires SESSIONs corresponding to APNs in the SESSION TRANSFER NOTIFICATION one by one and converts QoS flows having standard QCI attributes in each SESSION into corresponding EPS bearers; then the network replies ATTACH ACCEPT message carrying session transfer list; the ATTACH ACCEPT message carries an EPS bearer ID list for each session, the lists are arranged in sequence from small to large in QoSFlow ID in the source session, and if a certain QoS Flow cannot be converted into an EPS bearer ID, the corresponding list item is assigned with an invalid value. The UE receives the ATTACH ACCEPT message and transfers and deletes the source session. When the source Session is transferred, the TFT template is generated according to the corresponding Packet Filter in the QoS rule, and the APN AMBR corresponds to the Session AMBR;
3b) the method comprises the following steps After receiving the SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires SESSIONs corresponding to APNs in the SESSION TRANSFER NOTIFICATION one by one, converts QoSFlow of each SESSION into a corresponding EPS bearer according to the mapping relationship, and replies ATTACH ACCEPT message through the network; in addition, the UE receives the ATTACHACCEPT message and transfers and deletes the source session. When the UE transfers a source Session, a TFT template borne in the Session is generated according to a corresponding Packet Filter in a QoS rule, and APN AMBR is Session AMBR;
4): the UE sends an ATTACH COMPLETE message to COMPLETE the ATTACH procedure.
5): when the session to be transferred has both the QoS Flow of the standard QCI attribute and the QoSFlow of the non-standard QCI attribute, the network side initiates a special bearer activation Flow after the attachment Flow is completed, and establishes the bearer of the non-standard QCI attribute;
6): when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and maintains the IP address unchanged;
wherein, the step 5) and the step 6) have no sequence and can be operated in parallel;
meanwhile, the differences of 2a), 3a), and 2b), 3b) are that the EPS Bearer ID in 2a), 3a) is generated by the UE side and notified to the network, and the EPS Bearer ID in 2b), 3b) is generated by the network side.
Example two
As shown in fig. 4, when transferring a session from EPC to 5GS, UE also needs to transfer the session from source (EPS) to destination (5GS) in dual registration mode or single registration without N26 interface. Carrying DNN, PDN Session ID and QoSFlow activation information by the Session transfer request to transfer at least one Session from EPC to 5 GS; namely, the session transfer signaling is merged to simplify the signaling interaction in the session transfer process, so that the effects of reducing time delay, improving the efficiency of session transfer, ensuring the continuity of services and effectively improving the experience of users are achieved. This embodiment is specifically implemented by the UE using the SESSION transfer request and ACTIVATE QOS FLOW procedures to transfer the SESSION. Since the 5G protocol provides that a session cannot be established during the registration process, the session cannot be transferred in the registration process regardless of whether registration is performed in advance. Therefore, the session transfer step from EPS to 5GS is as follows:
1): the method comprises the following steps that (1) UE initiates a 5GS registration process from EPS to 5 GS;
2): UE sends a SESSION TRANSFER REQUEST message to TRANSFER at least one SESSION from EPC to 5GS, wherein the SESSION TRANSFER REQUEST message carries DNN (data Network name) and PDU Session ID generated by UE; when there are multiple PDN connections under the same APN, the PDN connections are arranged in the sequence of EPS bearer ids from small to large in the SESSION TRANSFER REQUEST message. When a plurality of PDN connections exist under the same APN and the UE only transfers part of PDN connections under the APN, the UE connected with the PDN which is not transferred does not generate PDU Session ID which is set as invalid value in the SESSION TRANSFERREQUEST message;
3): the network indexes the source Session information from PGW-C + SMF (PDN Gateway Control Plane; Session Management Function) through PDU Session ID, and generates corresponding QoS Flow for EPS bearing in the Session; and then sending a QoS Flow activation message to the UE to activate the QoSFlow of each session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list comprises the following parameters:
QoS rule, including QoS parameter and filter, and also including the default QoS Flow identification;
PDU Session ID, PDU Session where QoS Flow is located;
PDU address, IP address allocated by network for UE;
other parameters comprise one or any combination of Selected PDU Session Type, Selected SSC mode, Selected S-NSSAI, Selected DNN, Session AMBR, EPCO and the like;
in addition, the specific content of the parameter may refer to 24.501 protocol PDU Session Establishment Accept message parameters.
Or, as shown in fig. 5, when a SESSION is transferred from an EPC to a 5GS, where the SESSION is transferred from the EPS to the 5GS, and if an EPS bearer with a standard QCI attribute needs to be transferred to QoS Flow, the method in this embodiment is mainly used for transferring DNN, PDU SESSION ID, or DNN, PDU SESSION ID, QoS Flow ID, EPS bearer ID corresponding list and SESSION TRANSFER list carried by a SESSION TRANSFER NOTIFICATION message to TRANSFER at least one SESSION from the EPC to the 5GS, that is, the signaling interaction Flow of the SESSION TRANSFER process is simplified by using a simplified standard QCI bearer or QoS Flow TRANSFER Flow, so that delay is reduced, efficiency of SESSION TRANSFER is improved, continuity of a service is ensured, and an effect of improving experience of a user is effectively achieved. The method comprises the following specific steps:
1): the interoperation from EPS to 5GS is carried out on 5GS first.
2a) The method comprises the following steps UE sends a SESSION TRANSFER NOTIFICATION message carrying DNN, PDU SESSION ID and at least one of SESSIONs with standard QCI attribute bearer; the PDU Session ID is generated by the UE side, a Session generates a unique ID identification, and at least one bearer in the Session contained in the message is a standard QCI attribute;
2b) the method comprises the following steps UE sends a Session transport notification message carrying DNN, PDU Session ID, QoS Flow ID, EPS bearer ID corresponding list (EPSBearer ID map list) and a fourth Session list, and notifies the network to transfer the Session; the UE generates a PDU Session ID, a QoS Flow ID and an EPS Bearer ID mapping relation list, the list defines the corresponding relation between the QoS Flow and the EPS Bearer, and only contains the Bearer of the standard QCI attribute of the Session;
3a) the method comprises the following steps After obtaining the message of the session transfer list, the UE transfers and deletes the session in the EPS according to the QoS Flow ID in the session transfer list; the QoS Flow ID in the session is taken from a list in the message, the list is arranged according to the sequence of the EPSBearer ID in the source session from small to large, and if the network side can not transfer a certain EPS bearing in the source session, the list item is set to an invalid value.
3b) The method comprises the following steps After receiving the confirmation of the sending completion of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list; wherein, a Packet Filter in a QoS rule of the Session is generated according to a TFT template, and Session-AMBR is set as APN-AMBR;
4): the network side initiates a PDU Session Modification flow and establishes QoSFlow of non-standard QCI attribute;
5): and when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and keeps the IP address unchanged.
Wherein, the step 4 and the step 5 have no sequence and can be operated in parallel.
Meanwhile, the differences of 2a), 3a), and 2b), 3b) are that the QoS Flow ID in 2a), 3a) is generated by the UE side and notified to the network, and the QoS Flow ID in 2b), 3b) is generated by the network side.
An embodiment of the present invention further provides a system for transferring a session in an interworking process between 5G and LTE, where as shown in fig. 6, the system includes:
the system comprises a request unit, a processing unit and a processing unit, wherein the request unit is used for sending a session transfer request message to a network by UE and initiating session transfer, and the network comprises a 5G corresponding network or an LTE corresponding network;
an activating unit, configured to send, by the network, an EPS bearer activation message or a QoS Flow activation message to the UE, so as to transfer at least one session between the 5G corresponding network and the LTE corresponding network.
In the system for transferring a session in the interoperation process between the 5G and the LTE provided in the embodiment of the present invention, because the UE is registered in the EPC in advance in the dual registration mode in the prior art, when the IMS session is transferred from the 5GS to the EPS in the interoperation process: UE firstly initiates a PDN connection establishing process, establishes a default bearer for bearing IMS signaling; then, the network side initiates an activate dedicated bearer Flow, activates 2 dedicated bearers, which are respectively used to carry the IMS voice and the IMS video, that is, session transfer is performed through the multiple signaling interaction flows, and especially, when the UE has multiple sessions that need to be transferred from the 5GS to the EPS, the experience of the user is seriously affected, therefore, in the interoperation process of the 5G and the LTE, the session transfer process can be accelerated by reducing the signaling or simplifying the transfer Flow through the session transfer request message and the EPS bearer activation message, or the session transfer request message and the QoS Flow activation message transfer session, thereby improving service continuity and obtaining better user experience.
Optionally, the request unit includes:
a first REQUEST module, configured to trigger an ATTACH procedure by the UE, and send an ATTACH REQUEST message carrying a session transfer REQUEST by the UE, to notify the network of transferring a session; the Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session;
or, the second REQUEST module is configured to trigger an ATTACH Flow by the UE, and the UE sends an ATTACH REQUEST message carrying SESSION notification to notify the network of SESSION transfer, where the SESSION transfer notification carries a second SESSION list and at least one QoS Flow having a standard QCI attribute, and the second SESSION list includes an APN of each SESSION and PDU SESSION ID information for associating a source SESSION with a target SESSION by the network; or the SESSION TRANSFER NOTIFICATION carries a third SESSION list, where the third SESSION list includes an APN of each SESSION, so that the network associates PDU SESSION IDs of a source SESSION and a target SESSION and a mapping relationship list between QoS Flow IDs and EPS Bearer IDs;
or, a third request module, configured to initiate a 5GS registration procedure by the UE, and send a session transfer request message to transfer at least one session from the EPC to the 5GS, where the session transfer request message carries the DNN and the pdusessid generated by the UE;
or, the fourth request module is configured to send a SESSION TRANSFER NOTIFICATION message carrying the DNN, the PDU SESSION ID, and at least one of the SESSIONs that has a standard QCI attribute bearer by the UE; or the UE sends a SESSION transport notification message carrying the DNN, the PDScess ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list, and notifies the network to transfer the SESSION.
Optionally, the activation unit comprises:
a first activation module, configured to, after receiving a session transfer request message sent by a UE, a network obtain a session corresponding to each APN in the session transfer request, and send, to the UE, an ATTACH ACCEPT message carrying an EPS bearer activation signaling, where the ATTACH ACCEPT message includes a bearer list that can be transferred to an EPC;
or, the second activation module is configured to, after receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires a SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION and converts a QoS Flow having a standard QCI attribute in each SESSION into a corresponding EPS bearer; then the network replies ATTACHACCEPT message carrying session transfer list; or acquiring the SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION, converting the QoS Flow of each SESSION into a corresponding EPS bearer according to the mapping relation, and replying ATTACH ACCEPT messages by the network;
or, the third activation module is configured to index, by the network, source Session information from the PGW-C + SMF through the PDU Session ID, and generate a corresponding QoS Flow for an EPS bearer in the Session; then sending a QoS Flow activation message to UE to activate QoS Flow of each Session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list contains one or any combination of QoS rule, PDU Session ID, PDU address, Selected PDU Session Type, Selected SSC mode, Selected S-NSSAI, Selected DNN, Selected AMBR and EPCO;
or, the fourth activation module is configured to transfer and delete the session in the EPS according to the QoS Flow ID in the session transfer list after the UE acquires the session transfer list message; or after receiving the sending completion confirmation of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list.
The system further comprises:
the judging unit is used for judging the QoSFlow only with the non-standard QCI attribute in the session to be transferred;
the special bearer activation unit is used for initiating a special bearer activation process and establishing a bearer with non-standard QCI attribute after the network side completes the attachment process;
or, the Flow initiating unit is used for initiating a PDU Session Modification Flow by the network side and establishing a QoS Flow of the non-standard QCI attribute;
the non-standard QCI attribute transfer unit is used for initiating a session transfer Flow by the UE when the session to be transferred only has QoS Flow with the non-standard QCI attribute, transferring the session and maintaining the IP address unchanged;
the system of this embodiment may be configured to implement the technical solutions of the method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A method for transferring a session during interoperation between 5G and LTE, comprising:
and triggering the interoperation between the 5G and the LTE, and transferring at least one session between the 5G corresponding network and the LTE corresponding network through the session transfer request message and the EPS bearing activation message or the session transfer request message and the QoS Flow activation message in the interoperation process.
2. The method of claim 1, wherein when transferring a session from 5GS to EPC,
carrying a session transfer request and EPS bearing activation signaling by the ATTACH ATTACH request message to transfer at least one session from the 5GS to the EPC;
alternatively, the SESSION TRANSFER NOTIFICATION message is carried by the ATTACH request message to TRANSFER at least one SESSION from the 5GS to the EPC.
3. The method according to claim 1 or 2, characterized in that, when transferring a session from EPC to 5GS,
carrying DNN, PDN Session ID and QoS Flow activation message by the Session transfer request to transfer at least one Session from EPC to 5 GS;
or the SESSION TRANSFER NOTIFICATION message carries the DNN and the PDU SESSION ID, or the SESSION TRANSFER NOTIFICATION message carries the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID correspondence list and the SESSION TRANSFER list to TRANSFER at least one SESSION from the EPC to the 5 GS.
4. The method of claim 2, wherein the carrying of the session transfer request and the EPS bearer activation signaling by the ATTACH request message to transfer at least one session from the 5GS to the EPC comprises:
UE triggers ATTACH flow, and UE sends ATTACH REQUEST message carrying session transfer REQUEST to inform network to transfer session; the Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session;
after receiving a session transfer request message sent by the UE, the network acquires a session corresponding to each APN in the session transfer request, and sends ATTACH ACCEPT messages carrying an EPS bearer activation signaling to the UE, where the ATTACHACCEPT message includes a bearer list transferable to the EPC;
after receiving the EPS bearing activation signaling, the UE establishes EPS bearings in an EPC one by one and deletes the source session from the 5 GC;
the UE sends an ATTACH COMPLETE message to COMPLETE the ATTACH procedure.
5. The method of claim 2, wherein the carrying of a session association request message by the ATTACH request message to transfer at least one session from the 5GS to the EPC comprises:
the method comprises the steps that UE triggers an ATTACH Flow, the UE sends an ATTACH REQUEST message carrying SESSION TRANSFER NOTIFICATION to inform a network of transferring SESSIONs, wherein the SESSION TRANSFER NOTIFICATION carries a second SESSION list and at least one QoS Flow with standard QCI attributes, and the second SESSION list comprises APNs of the SESSIONs and PDU SESSION ID information enabling the network to associate a source SESSION and a target SESSION; or the SESSION TRANSFER NOTIFICATION carries a third SESSION list, where the third SESSION list includes an APN of each SESSION, so that the network associates PDU SESSION IDs of a source SESSION and a target SESSION and a mapping relationship list between QoS Flow IDs and EPS Bearer IDs;
after receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires a SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION and converts a QoS Flow having a standard QCI attribute in each SESSION into a corresponding EPS bearer; then the network replies ATTACH ACCEPT message carrying session transfer list; or acquiring the session corresponding to each APN in the SESSIONTRANSFER NOTIFICATION, converting the QoS Flow of each session into the corresponding EPS bearer according to the mapping relation, and then replying ATTACH ACCEPT information by the network;
UE sends ATTACH COMPLETE message to COMPLETE ATTACH flow;
when the session to be transferred has both the QoS Flow with the standard QCI attribute and the QoS Flow with the non-standard QCI attribute, the network side initiates a special bearer activation Flow after the attachment Flow is completed, and establishes the bearer with the non-standard QCI attribute;
and when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and maintains the IP address unchanged.
6. The method of claim 3, wherein the carrying, by the session transfer request, the DNN, the PDN session ID, and the QoS Flow activation message to transfer the at least one session from the EPC to the 5GS comprises:
UE initiates a 5GS registration process and sends a Session transfer request message to transfer at least one Session from EPC to 5GS, wherein the Session transfer request message carries DNN and PDU Session ID generated by the UE;
the network indexes the source Session information from PGW-C + SMF through PDU Session ID, and generates corresponding QoS Flow for EPS load-bearing in the Session; and then sending a QoS Flow activation message to the UE to activate QoS Flow of each Session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list comprises one or any combination of QoS rule, PDU Session ID, PDU address, Selected PDU Session Type, Selected SSC mode, Selected S-NSSAI, Selected DNN, Selected AMBR and EPCO.
7. The method of claim 3, wherein the transferring the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID correspondence list and the SESSION list by the SESSION TRANSFER NOTIFICATION message to TRANSFER at least one SESSION from the EPC to the 5GS comprises:
UE sends session NOTIFICATION message carrying DNN, PDU session ID and at least one of session with standard QCI attribute bearer; or, the UE sends a Session TRANSFER NOTIFICATION message carrying the DNN, the PDU Session ID, the QoS Flow ID, the EPS bearer ID corresponding list, and the fourth Session list, and notifies the network to TRANSFER the Session;
after obtaining the message of the session transfer list, the UE transfers and deletes the session in the EPS according to the QoS Flow ID in the session transfer list; or after receiving the sending completion confirmation of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list;
the network side initiates a PDU Session Modification Flow and establishes a QoS Flow of a non-standard QCI attribute;
and when the session to be transferred only has the QoS Flow with the non-standard QCI attribute, the UE initiates a session transfer Flow, transfers the session and keeps the IP address unchanged.
8. A system for transferring sessions during interoperation between 5G and LTE, comprising:
the system comprises a request unit, a processing unit and a processing unit, wherein the request unit is used for sending a session transfer request message to a network by UE and initiating session transfer, and the network comprises a 5G corresponding network or an LTE corresponding network;
an activating unit, configured to send, by the network, an EPS bearer activation message or a QoS Flow activation message to the UE, so as to transfer at least one session between the 5G corresponding network and the LTE corresponding network.
9. The system of claim 8, wherein the requesting unit comprises:
a first request module, configured to trigger an ATTACH procedure by the UE, and send an ATTACH request message carrying a session transfer request by the UE, to notify the network of transferring a session; the Session transfer request carries a first Session list, wherein the first Session list comprises an APN of each Session and PDU Session ID information for enabling a network to associate a source Session and a target Session;
or, the second REQUEST module is configured to trigger an ATTACH Flow by the UE, and the UE sends an ATTACH REQUEST message carrying SESSION transfer notification to notify the network of SESSION transfer, where the SESSION transfer notification carries a second SESSION list and at least one QoS Flow having a standard QCI attribute, and the second SESSION list includes an APN of each SESSION and PDU SESSION ID information for associating a source SESSION with a target SESSION by the network; or the SESSION TRANSFER NOTIFICATION carries a third SESSION list, where the third SESSION list includes an APN of each SESSION, so that the network associates PDU SESSION IDs of a source SESSION and a target SESSION and a mapping relationship list between QoS Flow IDs and EPS Bearer IDs;
or, a third request module, configured to initiate a 5GS registration procedure by the UE, and send a session transfer request message to transfer at least one session from the EPC to the 5GS, where the session transfer request message carries the DNN and the pdusessid generated by the UE;
or, the fourth request module is configured to send a SESSION TRANSFER NOTIFICATION message carrying the DNN, the PDU SESSION ID, and at least one of the SESSIONs that has a standard QCI attribute bearer by the UE; or the UE sends a SESSION TRANSFER NOTIFICATION message carrying the DNN, the PDU Session ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list, and notifies the network to TRANSFER the SESSION.
10. The system according to claim 8 or 9, wherein the activation unit comprises:
a first activation module, configured to, after receiving a session transfer request message sent by a UE, a network obtain a session corresponding to each APN in the session transfer request, and send, to the UE, an ATTACH ACCEPT message carrying an EPS bearer activation signaling, where the ATTACH ACCEPT message includes a bearer list that can be transferred to an EPC;
or, the second activation module is configured to, after receiving a SESSION TRANSFER NOTIFICATION message sent by the UE, the network acquires a SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION and converts a QoS Flow having a standard QCI attribute in each SESSION into a corresponding EPS bearer; then the network replies ATTACHACCEPT message carrying session transfer list; or acquiring the SESSION corresponding to each APN in the SESSION TRANSFER NOTIFICATION, converting the QoS Flow of each SESSION into a corresponding EPS bearer according to the mapping relation, and replying ATTACH ACCEPT messages by the network;
or, the third activation module is configured to index, by the network, source Session information from the PGW-C + SMF through the PDU Session ID, and generate a corresponding QoS Flow for an EPS bearer in the Session; then sending a QoS Flow activation message to UE to activate QoS Flow of each Session, wherein the QoS Flow activation message carries a QoS Flow list, and the QoS Flow list contains one or any combination of QoS rule, PDU Session ID, PDU address, Selected PDU Session Type, Selected SSC mode, Selected S-NSSAI, Selected DNN, Selected AMBR and EPCO;
or, the fourth activation module is configured to, after the UE acquires the session transfer list message, transfer and delete the session in the EPS according to the QoSFlow ID in the session transfer list; or after receiving the sending completion confirmation of the SESSION TRANSFER NOTIFICATION message, the UE TRANSFERs and deletes the SESSION in the EPS according to the DNN, the PDU SESSION ID, the QoS Flow ID, the EPS bearer ID corresponding list and the fourth SESSION list.
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" "23502_CR0042r2_5GS_Ph1_(Rel-15)_S2-182851 (was 2698) TS 23.502 Align the UE location presence status of LADN Session into Network Triggered Service Request procedure"", 《3GPP 》 *
HUAWEI等: "C1-181357 "Setting PDU session ID and S-NSSAI during PDU session establishment upon mobility from EPS to 5GS"", 《3GPP 》 *
QUALCOMM INCORPORATED: "S2-183238 "TS 23.502: Taking UE subscription into account when transfering PDU sessions during 5GC-EPC mobility"", 《3GPP 》 *
ZTE等: "S2-187382 "Clarification on the PDU session handling in EPS to 5GS handover with N26"", 《 3GPP 》 *
钟橙等: "5G核心网语音解决方案探析", 《数据通信》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022042295A1 (en) * 2020-08-26 2022-03-03 华为技术有限公司 Bearer processing method and apparatus
TWI772164B (en) * 2020-10-08 2022-07-21 聯發科技股份有限公司 User equipment and method to select access point name (apn) or data network name (dnn)
US11930427B2 (en) 2020-10-08 2024-03-12 Mediatek Inc. Configuration enhancements on access point name (APN) or data network name (DNN) selection in user equipment (UE)
WO2022100640A1 (en) * 2020-11-13 2022-05-19 维沃移动通信有限公司 Communication transfer method, terminal, and network side device

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