CN110650513B - Method and device for updating user plane path and computer storage medium - Google Patents

Method and device for updating user plane path and computer storage medium Download PDF

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CN110650513B
CN110650513B CN201810672475.3A CN201810672475A CN110650513B CN 110650513 B CN110650513 B CN 110650513B CN 201810672475 A CN201810672475 A CN 201810672475A CN 110650513 B CN110650513 B CN 110650513B
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user plane
new
pdu session
anchor point
smf
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CN110650513A (en
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王胡成
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Priority to PCT/CN2019/090288 priority patent/WO2020001253A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/248—Connectivity information update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/34—Modification of an existing route
    • H04W40/36—Modification of an existing route due to handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels

Abstract

The invention discloses a method and a device for updating a user plane path and a computer storage medium, which are used for solving the technical problems of more data transmission interruption and packet loss when the user plane path is switched in the prior art. The method comprises the following steps: selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated; sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated; and if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point.

Description

Method and device for updating user plane path and computer storage medium
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for updating a user plane path, and a computer storage medium.
Background
Mobile Edge Computing (MEC) introduces a virtualized platform into a Mobile network, can effectively implement service anchor point sinking, and shortens service response time.
In a 5G network, because a related technology of ultra-low latency and ultra-high reliability communication needs to be provided, in an MEC scenario, when service content or a User Equipment (UE) moves, service continuity needs to be ensured, so that service of an application layer is not interrupted. In order to ensure that the service of the application layer is not interrupted, the 5G core network needs to complete the user plane path switching in the 3GPP network after the application layer completes the migration of the UE context from the original MEC server to the new MEC server.
However, in the prior art, the Session Management Function (SMF) determines whether anchor point replacement and user plane path switching are required only according to the location of the UE and the Data Network Access Identifier (DNAI), or the SMF performs user plane path switching only according to the request of the application layer (for example, the location of the service content changes), which may cause the following problems: the 5G core network does not know when the application layer MEC server is ready to receive/send data, and therefore, a long time of data transmission interruption and packet loss may be caused before or after the user plane path switching is performed.
Therefore, how to switch the user plane path to reduce the occurrence of data transmission interruption and packet loss becomes an urgent technical problem to be solved.
Disclosure of Invention
The invention provides a method and a device for updating a user plane path and a computer storage medium, which are used for solving the technical problems of more data transmission interruption and packet loss when the user plane path is switched in the prior art.
In a first aspect, to solve the above technical problem, a technical solution of a user plane path updating method provided in an embodiment of the present invention is as follows:
selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated;
sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated;
and if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point.
And sending a first notification that the user plane anchor point needs to be updated to the AF through the SMF, so that the AF can transmit the UE context in time, and when receiving response information based on the first notification and determining that the path of the PDU session can be updated, updating the user directory of the PDU session according to the new user plane anchor point. Therefore, when the anchor point is updated, the SMF and the AF can be coordinated in time, the time delay and the service interruption caused by the change of the PDU conversation anchor point are reduced, and the service continuity is improved.
With reference to the first aspect, in a first possible implementation manner of the first aspect, before sending the first notification to the application layer AF, the method further includes:
if the mobile terminal UE is not in the service range of the new user plane anchor point, determining a new shunting point based on the current position of the UE and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
When the mobile terminal UE is not in the service range of the new user plane anchor point, the new shunting point can be determined through the current position of the UE and the new user plane anchor point, and then a user plane tunnel between the access network node serving the UE and the new shunting point is established according to the new shunting point, so that preparation work can be made for subsequent updating of the user plane tunnel, and timeliness and accuracy of user plane path switching can be effectively improved.
With reference to the first aspect, in a second possible implementation manner of the first aspect, before sending the first notification to the application layer AF, the method further includes:
if the data network access identifier DNAI of the appointed application is changed, determining a new shunting point based on the DNAI of the appointed application and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the designated application is an application in the PDU session.
When the designated application data network access identifier DNAI changes, a new shunting point can be determined through the designated application DNAI and the new user plane anchor point, and then a user plane tunnel between the access network node serving the UE and the new shunting point is established according to the new shunting point, so that preparation work can be well done for subsequent updating of the user plane tunnel, and timeliness and accuracy of user plane path switching can be effectively improved.
With reference to any one possible implementation manner of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the indicating that the SMF may update the path of the PDU session includes:
if the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the updating the user plane path of the PDU session based on the new user plane anchor point further includes:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rules are obtained for the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
By enabling the SMF to send different information to the UE or the access network according to different types of the access points, the switching efficiency of the user plane path can be improved.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the first notification further includes:
if the PDU session is served by a low-latency high-reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the sending a first notification to an application layer AF includes:
the SMF directly sends the first notice to the AF; or
And the SMF indirectly sends the first notice to the AF through a network capability open function (NEF) or a Policy Control Function (PCF).
In a second aspect, an embodiment of the present invention provides an apparatus for user plane path update, including:
the selection unit is used for selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated;
a transceiving unit, configured to send a first notification to an application layer AF, and receive a response message returned by the AF in response to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated;
and a path updating unit, configured to update the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF may update the path of the PDU session.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the transceiver unit is specifically configured to:
if the mobile terminal UE is not in the service range of the new user plane anchor point, determining a new shunting point based on the current position of the UE and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
With reference to the second aspect, in a second possible implementation manner of the second aspect, the transceiver unit is further configured to:
if the designated application data network access identifier DNAI is changed, determining a new shunting point based on the designated application DNAI and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
With reference to any one possible implementation manner of the second aspect to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the path updating unit is configured to:
if the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the path updating unit is further configured to:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rules are obtained for the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
With reference to the second aspect, in a fifth possible implementation manner of the second aspect, the first notification further includes:
if the PDU session is served by a low-latency high-reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
With reference to the second aspect, in a sixth possible implementation manner of the second aspect, the transceiver unit is further configured to:
the SMF directly sends the first notice to the AF; or
And the SMF indirectly sends the first notice to the AF through a network capability open function (NEF) or a Policy Control Function (PCF).
In a third aspect, an embodiment of the present invention further provides an apparatus for user plane path switching, where the apparatus includes:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method according to the first aspect by executing the instructions stored by the memory.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, including:
the computer readable storage medium stores computer instructions which, when executed on a computer, cause the computer to perform the method of the first aspect as described above.
Through the technical solutions in one or more of the above embodiments of the present invention, the embodiments of the present invention have at least the following technical effects:
in the embodiment provided by the invention, when the SMF determines that the original user plane anchor point of the PDU conversation needs to be updated, a new user plane anchor point is selected; and sending a first message which needs to update the original user plane anchor point to the AF, then receiving a response message returned by the AF based on the first notification, and updating the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF can update the path of the PDU session. Therefore, when the anchor point is updated, the SMF and the AF can be coordinated in time, the time delay and the service interruption caused by the change of the PDU conversation anchor point are reduced, and the service continuity is improved.
Drawings
Fig. 1 is a flowchart of a user plane path switching method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of user plane anchor point update triggered by UE mobility according to an embodiment of the present invention;
fig. 3 is a schematic diagram of user plane anchor point update triggered by mobility of application layer service content according to an embodiment of the present invention;
fig. 4 is a flowchart of updating user plane anchor points of a PDU session triggered by UE mobility according to an embodiment of the present invention;
fig. 5 is a flowchart of updating user plane anchor points of a PDU session triggered by mobility according to service content of an application layer according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a user plane path switching apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for updating a user plane path and a computer storage medium, which are used for solving the technical problems of more data transmission interruption and packet loss when the user plane path is switched in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the present application is as follows:
a method for switching a user plane path is provided, which comprises the following steps: selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated; sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; the first notification is used for notifying the AF of a message which needs to update the anchor point of the original user plane; and if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point.
In the scheme, when the SMF determines that the original user plane anchor point of the PDU session needs to be updated, a new user plane anchor point is selected; and sending a first message which needs to update the original user plane anchor point to the AF, then receiving a response message returned by the AF based on the first notification, and updating the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF can update the path of the PDU session. When the anchor point is updated, the SMF and the AF can be coordinated in time, and the time delay and the service interruption caused by the change of the PDU conversation anchor point are reduced, so that the service continuity is improved.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
Referring to fig. 1, an embodiment of the invention provides a method for updating a user plane path, and the processing procedure of the method is as follows.
Step 101: and selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session is determined to be required to be updated.
In a mobile communication network, when a mobile terminal moves or service contents for providing services for the mobile terminal are migrated, a change of a user plane anchor point may be caused.
Referring to fig. 2, when a user uses a mobile terminal (UE) to watch a tv program (provided by a MESC Server), in the process of moving the user, a handover may be made from one base station (i.e., an Access Network 1 serving the UE) to another base station (i.e., an Access Network 2 serving the UE), so that a Radio Access Network (RAN) node serving the UE changes, which causes a change of a user plane anchor point, that is, an original user plane anchor point is updated to a new user plane anchor point. Generally, the SMF may determine whether a mobile terminal (UE) is within a service range of an original user plane anchor point according to a current location of the UE, determine that the original user plane anchor point needs to be updated if the UE is not within the service range of the original user plane anchor point, and select a new user plane anchor point according to the current location of the UE.
Referring to fig. 3, when the service content (provided by MEC server 1) being accessed by the user is migrated to MEC server 2 after a period of time, MEC server 1 providing the service content for the mobile terminal needs to migrate or redirect the user to MEC server 2, which results in the data network accessed by the terminal being changed from data network 1 to data network 2, thereby possibly causing a change in the user plane anchor point, i.e., an update from the original user plane anchor point to a new user plane anchor point. Generally, the SMF needs to determine whether a DNAI designated for application changes according to a received data network Access Identifier (DN Access Identifier, DNAI) list, and if so, determines that an original user plane anchor needs to be updated, and selects a new user plane anchor according to a current location of the UE.
After the SMF selects the new user plane anchor, step 102 may be performed.
Step 102: sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; the first notification is used for notifying the AF of a message which needs to update the anchor point of the original user plane; the AF is a server deployed in an application layer, such as an operator service server, a third party service server, an MEC server, and the like.
Before sending a first notification to a server (AF) deployed in an application layer, if the SMF determines that a mobile terminal (UE) is not in the service range of a new user plane anchor point or a Data Network Access Identifier (DNAI) of a specified application changes, determining a new shunting point according to the current position of the UE and the new user plane anchor point; and then, according to the new shunting point, establishing a user plane tunnel between the access network node serving the UE and the new shunting point.
Specifically, according to the new shunting point, a user plane tunnel between an access network node serving the UE and the new shunting point is established, and uplink and downlink tunnel endpoint information is distributed to the new shunting point according to the new shunting point and a new user plane anchor point; and sending new uplink tunnel endpoint information to an access network corresponding to the new shunting point, so that the access network corresponding to the new shunting point can perform uplink tunnel configuration according to the new uplink tunnel endpoint information, and sending new downlink tunnel endpoint information to the new user plane anchor point, so that the new user plane anchor point can perform downlink tunnel configuration according to the new downlink tunnel endpoint information, thereby completing the establishment of a user plane tunnel between an access network node serving the UE and the new shunting point.
After establishing a user plane tunnel between the access network node serving the UE and the new forking point, the SMF sends a first notification to a server AF deployed in an application layer. Specifically, if the service content operator allows the AF to directly access the network, the SMF may directly send a first notification to the AF; or the service content operator does not allow the AF to directly access the network, the SMF may indirectly send the first notification to the AF through the network capability openness function NEF or the policy control function PCF.
Wherein, the PDU session is for a low latency high reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
After the SMF receives the response message sent by the AF and returned based on the first notification, step 103 may be performed.
Step 103: and if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point.
If the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
Specifically, the SMF updating the user plane path of the PDU session based on the new user plane anchor point includes sending IPV6 prefix and routing rule newly allocated to the UE; wherein, newly allocated IPV6 prefix and routing rule are obtained for the new user plane anchor; or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
Then, SMF informs original user plane anchor point to release tunnel resource, so as to complete switching of whole user plane path.
In order to make the technical solution more clearly understandable for those skilled in the art, two embodiments will be provided below for explanation.
Embodiment one, user plane anchor update of PDU session triggered by UE mobility:
referring to fig. 4, when the UE moves, causing a change in the RAN node of the access network,
step 401: the SMF determines that an original user plane anchor point (Old UPF) of the PDU conversation needs to be updated according to the current position of the UE, and selects a new user plane anchor point and a shunting point.
The current location of the UE may be determined according to a node identifier of an access network RAN providing service for the UE, a tracking area identifier where the UE is located, and the like. The diversion point can be a BP diversion point (aiming at an address of an IPV6 type) or a UL CL diversion point (also called an uplink and downlink diverter, aiming at an address of an IPV4 type).
It should be understood that the selection of the new user plane anchor point and the split point (BP or UL CL) is performed by the SMF according to the existing procedures in the prior art, and will not be described herein again. And, in the user plane transmission path of the PDU session, if a split point (BP) needs to be used, the SMF needs to allocate an IPv6 prefix to the split point (BP) at the same time of selecting the split point.
Step 402, if the shunting point (BP or UL CL) changes, the SMF sends the shunting point uplink tunnel endpoint information to the target access network (RAN).
Wherein the target access network (RAM) is the access network corresponding to the new user plane anchor (new UPF).
Specifically, the SMF sends an N2SM message to the target RAN access network through the AMF, where the message carries the uplink tunnel endpoint information allocated to the forking point (BP or UL CL). When the shunting point is a BP shunting point, a target access network (RAN) performs uplink tunnel configuration according to the received BP tunnel endpoint; when the shunting point is the UL CL shunting point, the target access network RAN only stores the tunnel endpoint of the UL CL, and waits for a further instruction of the SMF to perform uplink tunnel configuration.
Step 403: the SMF sends a first notice to be switched by the user plane anchor point to the AF and receives a response message returned based on the first notice.
Wherein the first notification is to indicate that the updating of the user plane anchor point has been completed in the core network. If the operator allows the AF to directly access the network, the SMF may directly send the first notification to the AF, otherwise, the SMF needs to forward the first notification through the NEF or the PCF, and indirectly sends the first notification to the AF.
After receiving the first notification that the user plane anchor point is to be switched, the AF switches the context of the UE. When the AF completes the context switch to the UE, a response message is sent to the SMF, and it is also indicated in the response message whether the migration of the application layer server will occur. If the response message indicates that the application layer server is migrated, the SMF needs to wait for a further instruction of the AF (indicating that the migration of the application layer server is completed) to switch the user plane path according to the type of the split point (UL CL or BP); and if the response message indicates that the application layer server can not be migrated, switching the user plane path according to the type of the shunting point (UL CL or BP).
Specifically, switching the user plane path according to the type of the splitting point (UL CL or BP) includes:
if the diversion point is the UL CL diversion point, the step 404a is executed when the user plane path is switched: the SMF sends an instruction to the target access network (RAN) to perform an uplink tunnel switch for the PDU session.
If the diversion point is a BP diversion point, the step 404b is executed when the user plane path is switched: the SMF sends the newly allocated IPv6 prefix and routing rules to the UE.
And finally, the SMF informs the anchor point and the shunting point of the original user plane to release the tunnel resources.
Thus, the switching of the whole user plane path is completed.
And the second embodiment is the updating of the user plane anchor point of the PDU conversation triggered by the service content migration.
Please refer to fig. 5, which is a user plane anchor point update caused by the change of the service content of the application layer.
Step 500: the SMF sends a notification to the AF whether to update the user plane anchor.
Because the SMF can master all applied DNAIs according to a DNAI list carried in an AF request sent by the AF, when the SMF receives the updated DNAI list, the SMF can judge whether the user plane anchor point needs to be updated according to the current position of the UE and the applied DNAI, if the user plane anchor point does not need to be updated, the SMF sends a notice that the user plane anchor point does not need to be updated to the AF, so that the AF can delete the UE context after completing the transmission of the UE context. If the determination result is that the user plane anchor point needs to be updated, after the UE context transfer is completed, the UE context is retained, and step 501 is executed.
Step 501: and the SMF determines to update the original user plane anchor point of the PDU conversation according to the current position of the UE and the DNAI appointed to be applied in the DNAI list, and selects a new user plane anchor point and a shunting point.
The diversion point can be a BP diversion point (aiming at an address of an IPV6 type) or a UL CL diversion point (also called an uplink and downlink diverter, aiming at an address of an IPV4 type).
In addition, it is necessary to establish and modify the N4 session for the user plane anchors of the PDU session (including the changed new user anchor, the original user plane anchor, and the unchanged user plane anchor 1(UPF 1)). In the PDU session, if a split point is needed, if the selected split point is a BP split point, it needs to be allocated with an IPv6 prefix.
It should be understood that the selection of the new user plane anchor point and the split point (BP or UL CL) is performed by the SMF according to the existing procedures in the prior art, and will not be described herein again. And, in the user plane transmission path of the PDU session, if a split point (BP) needs to be used, the SMF needs to allocate an IPv6 prefix to the split point (BP) at the same time of selecting the split point.
After the new user plane anchor is selected, step 502 may be performed.
Step 502: if the shunting point (BP or UL CL) changes, the SMF sends a shunting point uplink tunnel endpoint message to a target access network (RAN).
Since step 502 is the same as step 402, it is not repeated herein.
Step 503 a: the SMF sends a first notification to the AF.
After receiving a first notification that the original user plane anchor point needs to be updated, the AF transmits the UE context (the UE context is transmitted from the original AF corresponding to the original user plane anchor point to a new AF corresponding to the new user plane anchor point), and releases the UE context locally stored in the original AF after completing the transmission. The original AF will then return a response message to the SMF for the first notification.
Step 503 b: the SMF receives a response message based on the first notification.
After receiving the response message that can perform the path switching, the SMF updates the user plane of the PDU session.
Specifically, if the diversion point is the UL CL diversion point, the step 504a is executed when the user plane path is switched: the SMF sends an instruction to the target access network (RAN) to perform an uplink tunnel switch for the PDU session.
If the split point is a BP split point, step 504b is executed when the user plane path is switched: the SMF sends the newly allocated IPv6 prefix and routing rules to the UE.
And finally, the SMF informs the anchor point and the shunting point of the original user plane to release the tunnel resources.
Based on the same inventive concept, an embodiment of the present invention provides a device for updating a user plane path, where a specific implementation of a method for updating a user plane path of the device may refer to descriptions in the method embodiment, and repeated descriptions are omitted, please refer to fig. 6, and the device includes:
a selecting unit 601, configured to select a new user plane anchor point when it is determined that an original user plane anchor point of a packet data unit PDU session needs to be updated;
a transceiving unit 602, configured to send a first notification to an application layer AF, and receive a response message returned by the AF and responding to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated;
a path updating unit 603, configured to update the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF may update the path of the PDU session.
Optionally, the transceiver 602 is specifically configured to:
if the mobile terminal UE is not in the service range of the new user plane anchor point, determining a new shunting point based on the current position of the UE and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
Optionally, the transceiver 602 is further configured to:
if the designated application data network access identifier DNAI is changed, determining a new shunting point based on the designated application DNAI and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
Optionally, the path updating unit 603 is configured to:
if the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
Optionally, the path updating unit 603 is further configured to:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rules are obtained for the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
Optionally, the first notification further includes:
if the PDU session is served by a low-latency high-reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
Optionally, the transceiver 602 is further configured to:
the SMF directly sends the first notice to the AF; or
And the SMF indirectly sends the first notice to the AF through a network capability open function (NEF) or a Policy Control Function (PCF).
Based on the same inventive concept, an embodiment of the present invention provides a communication system, where a specific implementation of a user plane path updating method of the communication system may refer to the description of the method embodiment, and repeated descriptions are omitted, and the apparatus includes:
the session management function SMF is used for selecting a new user plane anchor point when determining that the original user plane anchor point of the packet data unit PDU session needs to be updated; sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated; if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point;
the application layer server (AF) is used for receiving the first notification sent by the SMF, transmitting the UE context, and returning the response information based on the first notification after the transmission is finished;
and the user plane function UPF is used for receiving and configuring a tunnel configuration instruction related to the updating of the user plane path.
Optionally, the SMF is further configured to:
if the mobile terminal UE is not in the service range of the new user plane anchor point, the SMF determines a new shunting point based on the current position of the UE and the new user plane anchor point;
distributing new uplink tunnel endpoint information to the new shunting point according to the new shunting point and the new user plane anchor point;
and sending the new uplink tunnel endpoint information to the access network corresponding to the new shunting point.
Optionally, the SMF is further configured to:
if the designated application data network access identifier DNAI is changed, determining a new shunting point based on the designated application DNAI and the new user plane anchor point;
distributing new uplink tunnel endpoint information to the new shunting point according to the new shunting point and the new user plane anchor point;
and sending the new uplink tunnel endpoint information to the access network corresponding to the new shunting point.
Optionally, the UPF is specifically configured to:
receiving the new uplink tunnel endpoint information;
and performing uplink tunnel configuration on the new shunting point according to the new uplink tunnel endpoint information.
Optionally, the SMF is further configured to:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rules are obtained for the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
Optionally, the UPF is further configured to:
and receiving the information for switching the tunnel of the PDU session.
Based on the same inventive concept, an embodiment of the present invention provides an apparatus for user plane path update, including: at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the user plane path updating method as described above by executing the instructions stored by the memory.
Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, including:
the computer-readable storage medium stores computer instructions that, when executed on a computer, cause the computer to perform the user plane path updating method as described above.
In the embodiment provided by the invention, when the SMF determines that the original user plane anchor point of the PDU conversation needs to be updated, a new user plane anchor point is selected; and sending a first message which needs to update the original user plane anchor point to the AF, then receiving a response message returned by the AF based on the first notification, and updating the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF can update the path of the PDU session. When the anchor point is updated, the SMF and the AF can be coordinated in time, and time delay and a service terminal caused by the change of the PDU conversation anchor point are reduced, so that the continuity of the service is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (16)

1. A method for updating a user plane path is applied to a Session Management Function (SMF), and is characterized by comprising the following steps:
selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated;
sending a first notification to an application layer (AF), and receiving a response message which is returned by the AF and responds to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated;
and if the response message indicates that the SMF can update the path of the PDU session, updating the user plane path of the PDU session based on the new user plane anchor point.
2. The method of claim 1, wherein before sending the first notification to the application layer AF, further comprising:
if the mobile terminal UE is not in the service range of the new user plane anchor point, determining a new shunting point based on the current position of the UE and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
3. The method of claim 1, wherein before sending the first notification to the application layer AF, further comprising:
if the designated application data network access identifier DNAI is changed, determining a new shunting point based on the designated application DNAI and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
4. The method of any of claims 1-3, wherein the response information indicating that the SMF can update the path of the PDU session comprises:
if the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
5. The method of claim 1, wherein updating the user plane path for the PDU session based on the new user plane anchor comprises:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rule are obtained from the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
6. The method of claim 1, wherein the first notification further comprises:
if the PDU session is served by a low-latency high-reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
7. The method of claim 1, wherein sending the first notification to the application layer AF comprises:
the SMF directly sends the first notice to the AF; or
And the SMF indirectly sends the first notice to the AF through a network capability open function (NEF) or a Policy Control Function (PCF).
8. An apparatus for updating a user plane path, applied to a Session Management Function (SMF), comprising:
the selection unit is used for selecting a new user plane anchor point when the original user plane anchor point of the packet data unit PDU session needs to be updated;
a transceiving unit, configured to send a first notification to an application layer AF, and receive a response message returned by the AF in response to the first notification; wherein, the first notification is used for notifying the AF of a message that the original user plane anchor point needs to be updated;
and a path updating unit, configured to update the user plane path of the PDU session based on the new user plane anchor point if the response message indicates that the SMF may update the path of the PDU session.
9. The apparatus as claimed in claim 8, wherein said transceiver unit is specifically configured to:
if the mobile terminal UE is not in the service range of the new user plane anchor point, determining a new shunting point based on the current position of the UE and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
10. The apparatus as recited in claim 8, wherein said transceiver unit is further configured to:
if the designated application data network access identifier DNAI is changed, determining a new shunting point based on the designated application DNAI and the new user plane anchor point;
establishing a user plane tunnel between an access network node serving the UE and the new shunting point according to the new shunting point; wherein the UE is the UE in the PDU session.
11. The apparatus of any one of claims 8-10, wherein the path update unit is to:
if the response information is information that the target application layer server is not migrated or the response information is information that the UE context has been migrated to the target application layer server, the response information indicates that the SMF can update the path of the PDU session.
12. The apparatus of claim 8, wherein the path update unit is further configured to:
sending IPV6 prefix and routing rule newly allocated for the UE to the UE; wherein the newly allocated IPV6 prefix and routing rule are obtained from the new user plane anchor;
or sending the information for switching the tunnel of the PDU session to an access network or a shunting point of the UE.
13. The apparatus of claim 8, wherein the first notification further comprises:
if the PDU session is served by a low-latency high-reliability service, the first notification further includes information indicating that the AF preferentially migrates the context of the UE.
14. The apparatus as recited in claim 8, wherein said transceiver unit is further configured to:
the SMF directly sends the first notice to the AF; or
And the SMF indirectly sends the first notice to the AF through a network capability open function (NEF) or a Policy Control Function (PCF).
15. An apparatus for updating a user plane path, applied to a Session Management Function (SMF), comprising:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any one of claims 1-7 by executing the instructions stored by the memory.
16. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-7.
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