CN112015566A - User plane function switching method, device and system - Google Patents
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Abstract
The disclosure provides a user plane function switching method, device and system, and relates to the technical field of mobile communication. The utility model discloses a user plane function UPF switching method, which comprises: under the condition that the terminal inquires that the existing session has a feasible path superior to the current path of the session, determining whether to immediately reallocate the anchor point according to the activation state of the session; and under the condition of determining to reallocate the anchor point, releasing the original session, reestablishing the session and connecting to the reallocated anchor point. By the method, whether the session is in the active state or not can be judged before switching the UPF, the session is ended and the session is restarted to switch the anchor point only under the condition of the inactive state, and the continuity of the service and the session is ensured.
Description
Technical Field
The present disclosure relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a system for switching user plane functions.
Background
In the terminal operation process, a single terminal may simultaneously perform multiple PDU (Protocol Data Unit, PDU) sessions or services, and these PDU sessions or services may adopt different modes of service and session continuity. Each PDU session is anchored at a certain UPF (User Plane Function).
The 5G network defines 3 SSC modes (modes of traffic and Service Continuity), which are used depending on the application and traffic requirements.
Disclosure of Invention
An object of the present disclosure is to ensure continuity of a session while improving network service capability.
According to an aspect of the present disclosure, a method for switching a UPF is provided, including: under the condition that the terminal inquires that the existing session has a feasible path superior to the current path of the session, determining whether to immediately reallocate the anchor point according to the activation state of the session; and under the condition of determining to reallocate the anchor point, releasing the original session, reestablishing the session and connecting to the reallocated anchor point.
In some embodiments, determining whether to reassign an anchor point according to an activation status of a session includes: determining an activation state of a session; determining a reassignment anchor point under the condition that the activation state is the non-activation state; and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
In some embodiments, the feasible paths that exist better than the current path of the session include: at least one of the quality of service, the category, or the efficiency of the feasible path is better than the current path.
In some embodiments, releasing the original session, reestablishing the session and connecting to the reassigned anchor point comprises: the SMF (Session Management Function) informs the terminal to release the Session through an Access and Mobility Management Function (AMF), wherein, determining whether to immediately reallocate the anchor point is executed by the SMF; the terminal releases the session anchored in the current UPF; the terminal initiates the establishment of a session anchored at the UPF associated with the feasible path.
In some embodiments, the SMF notifying the terminal to release the session via the AMF includes: SMF sends session release message to AMF, the session release message includes release reason information; the AMF sends a session release message to the terminal so that the terminal releases the session according to the release reason value and immediately initiates the session reestablishment.
By the method, whether the session is in the active state or not can be judged before switching the UPF, the session is ended and the session is restarted to switch the anchor point only under the condition of the inactive state, and the continuity of the service and the session is ensured.
According to an aspect of further embodiments of the present disclosure, a UPF switching apparatus is provided, including: the judging unit is configured to determine whether to immediately reallocate the anchor point according to the activation state of the session under the condition that the terminal inquires that the existing session has a feasible path which is superior to the current path of the session; and the reconnection unit is configured to release the original session, reestablish the session and connect to the anchor point which is reallocated under the condition that the judgment unit determines to reallocate the anchor point.
In some embodiments, the determining unit is configured to: determining an activation state of a session; determining a reassignment anchor point under the condition that the activation state is the non-activation state; and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
According to an aspect of further embodiments of the present disclosure, a UPF switching apparatus is provided, including: a memory; and a processor coupled to the memory, the processor configured to perform any one of the above UPF switching methods based on instructions stored in the memory.
The device can judge whether the session is in an active state before switching the UPF, and only under the condition of an inactive state, the session is ended and the session is restarted to switch the anchor point, so that the continuity of the service and the session is ensured.
According to an aspect of still further embodiments of the present disclosure, a computer-readable storage medium is proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of any one of the above methods of UPF handover.
By executing the instructions on the computer-readable storage medium, whether the session is in an active state or not can be judged before switching the UPF, the session is ended only in the case of the inactive state, and the session is restarted to switch the anchor point, so that the continuity of the service and the session is ensured.
Further, according to an aspect of some embodiments of the present disclosure, there is provided a UPF switching system including: a terminal configured to query a feasible path of an existing session; releasing the original session according to the session release message, and initiating and reestablishing the session; the SMF is configured to determine whether to immediately reallocate the anchor point according to the activation state of the session under the condition that the terminal inquires that a feasible path superior to the current path of the session exists in the existing session; under the condition of determining to reallocate the anchor point, sending a session release message to the AMF; and the AMF is configured to send the session release message to the terminal.
In some embodiments, the SMF is configured to: determining an activation state of a session; determining a reassignment anchor point under the condition that the activation state is the non-activation state; and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
In some embodiments, the session release message includes release cause information; the terminal is configured to release the session according to the release cause value and immediately initiate re-establishment of the session.
The UPF switching system can judge whether the session is in an active state before switching the UPF, only ends the session under the condition of an inactive state and re-starts the session to switch the anchor point, thereby ensuring the continuity of the service and the session.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is a flow diagram of some embodiments of a UPF switching method of the present disclosure.
Fig. 2 is a flow chart of other embodiments of a UPF switching method of the present disclosure.
Fig. 3 is a schematic diagram of some embodiments of a UPF switching apparatus of the present disclosure.
Fig. 4 is a schematic diagram of other embodiments of a UPF switching apparatus of the present disclosure.
Fig. 5 is a schematic diagram of some further embodiments of a UPF switching apparatus according to the present disclosure.
Fig. 6 is a schematic diagram of some embodiments of a UPF switching system of the present disclosure.
Fig. 7 is a signaling interaction diagram of some embodiments of the UPF switching system of the present disclosure.
Detailed Description
The technical solution of the present disclosure is further described in detail by the accompanying drawings and examples.
The 3 SSC patterns for a 5G network are as follows:
SSC pattern 1: the UPF anchor is always unchanged. I.e. the UPF, which is the anchor point for the PDU session, will remain unchanged at all times when the PDU session is established, regardless of changes in the topology of the UE access network (e.g. access type and cell change).
SSC pattern 2: the UPF anchor may be changed, the link "break before make", the Network may trigger the release of the original PDU session and inform the UE to immediately re-establish a new PDU session to the same Data Network (DN). When a new PDU session is established, a new UPF is selected as the anchor point for the PDU session.
SSC pattern 3: the UPF anchor may be changed so that the link is "created first and then broken", i.e., the network allows the UE to establish a connection to the same data network through a new PDU session anchor before the original PDU session anchor connection is released.
When the SSC mode 1 is adopted, routing roundabout can be caused due to the fact that topology of the UE accessed to the network changes, transmission efficiency is reduced, and network resources are wasted; due to the fact that the SSC mode 2 is adopted, an ongoing session is interrupted firstly, and then a new session to the same DN is reestablished immediately, service interruption can be caused, and user experience is further influenced; the SSC mode 3 has high requirements on the network and the terminal, is difficult to implement, and requires the terminal to have corresponding capability, and particularly, in the initial stage of 5G network establishment, no terminal temporarily supports the SSC mode 3.
A flow diagram of some embodiments of the UPF switching method of the present disclosure is shown in fig. 1.
In step 101, the terminal queries for an existing session whether there is a feasible path that is better than the current path of the session. In some embodiments, the better path may be a path that can provide higher quality, more types, or more efficient services for traffic, for example, in an edge computing application scenario, a path that can provide higher quality, more types, or more efficient services may be preferred over the current path.
In step 102, it is determined whether to immediately reassign an anchor point according to the activation state of the session. If the anchor point is determined to be reallocated immediately, go to step 103; if it is determined that anchor points are not to be reallocated immediately, execution continues to step 102 for a time at which anchor point reallocation can be performed. In some embodiments, this determination is performed at the SMF. In some embodiments, to avoid interrupting the current session, the reassignment of an anchor point is determined only if the session is in an inactive state.
In step 103, the original session is released, the session is re-established and connected to the re-assigned anchor point.
By the method, whether the session is in the active state or not can be judged before switching the UPF, the session is ended and the session is restarted to switch the anchor point only under the condition of the inactive state, and the continuity of the service and the session is ensured.
A flow diagram of further embodiments of the UPF switching method of the present disclosure is shown in fig. 2.
In step 201, the terminal inquires that there is a feasible path for the existing session that is better than the current path of the session. In some embodiments, the terminal may perform a path query based on the operation mode in SSC mode 2. In some embodiments, the SMF is notified to perform step 202 when the terminal queries a feasible path that is better than the current path of the session.
In step 202, the SMF queries the active state of the session.
In step 203, if the active state of the session is inactive, execute step 204; if the active state of the session is the active state, the step 202 is continuously executed until the active state of the session is the inactive state.
In some embodiments, if the session in the active state is not switched to the inactive state within a predetermined time period, the current UPF switching operation is ended, so as to avoid repeated switching caused by a change in the network state.
In step 204, the SMF notifies the terminal to release the session via the AMF. In some embodiments, the SMF may send a session release message to the AMF, the session release message including release reason information, and the AMF forwards the session release message to the terminal.
In step 205, the terminal releases the session anchored at the current UPF.
In step 206, the terminal initiates the establishment of a session. Anchor points are reselected during session re-establishment so that the UPFs associated with the feasible paths determined in step 201 can be anchored. In some embodiments, the terminal may release the original session according to the release cause value in the session release message, and immediately initiate an operation of reestablishing the session, thereby avoiding affecting the session activation.
By such a method, whether to change the anchor point immediately can be determined according to the activation state of the session on the basis of the SSC mode 2, thereby improving the service quality on one hand and the continuity of the session on the other hand. Compared with SSC mode 3, the method reduces the requirement on the terminal capability and is beneficial to popularization and application.
A schematic diagram of some embodiments of the UPF switching apparatus of the present disclosure is shown in fig. 3. The judging unit 301 can determine whether to reallocate the anchor point immediately according to the activation state of the session in the case where the terminal determines that there is a feasible path better than the current path of the session for the existing session inquiry. In some embodiments, the better path may be a path that can provide higher quality, more types, or more efficient services for traffic, for example, in an edge computing application scenario, a path that can provide higher quality, more types, or more efficient services may be preferred over the current path. In some embodiments, to avoid interrupting the current session, the reassignment of an anchor point is determined only if the session is in an inactive state.
The reconnection unit 302 is capable of releasing the original session, reestablishing the session, and connecting to the anchor point newly allocated in the case where the judgment unit 301 determines to reallocate the anchor point.
The device can judge whether the session is in an active state before switching the UPF, and only under the condition of an inactive state, the session is ended and the session is restarted to switch the anchor point, so that the continuity of the service and the session is ensured.
In some embodiments, for a session in an active state, the determining unit 301 may determine to reallocate an anchor point after waiting for the session to change to an inactive state. In other embodiments, if the session in the active state is not switched to the inactive state within the predetermined time period, the current UPF switching operation is ended, so as to avoid repeated switching caused by network state change.
Fig. 4 is a schematic structural diagram of an embodiment of the UPF switching apparatus according to the present disclosure. The UPF switching means comprises a memory 401 and a processor 402. Wherein: the memory 401 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is for storing instructions in the corresponding embodiments of the UPF switching method above. The processor 402 is coupled to the memory 401 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 402 is configured to execute instructions stored in a memory, which can ensure continuity of services and sessions.
In one embodiment, as also shown in fig. 5, the UPF switching apparatus 500 includes a memory 501 and a processor 502. The processor 502 is coupled to the memory 501 by a BUS 503. The UPF switch 500 may also be coupled to an external storage device 505 via a storage interface 504 for invoking external data, and may also be coupled to a network or another computer system (not shown) via a network interface 506. And will not be described in detail herein.
In this embodiment, the data instructions are stored in the memory, and then the instructions are processed by the processor, so that the continuity of the service and the session can be ensured.
In another embodiment, a computer readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the corresponding embodiment of the UPF switching method. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
A schematic diagram of some embodiments of the UPF switching system of the present disclosure is shown in fig. 6.
The terminal 61 can query the feasible path of the existing session, and release the original session and initiate the session re-establishment in case of receiving the session release message. In some embodiments, the terminal 61 may determine the executed operation according to the release reason information in the session release message, and if the release reason information is to switch to the better path, the session is immediately re-established after the session is released.
The SMF 62 can determine whether to immediately reallocate an anchor point according to the activation state of the session in the case where the terminal inquires that there is a feasible path superior to the current path of the session in the existing session, and transmit a session release message to the AMF in the case where it is determined to reallocate an anchor point.
The AMF 63 transmits a session release message from the SMF to the terminal.
The UPF switching system can judge whether the session is in an active state before switching the UPF, only ends the session under the condition of an inactive state and re-starts the session to switch the anchor point, thereby ensuring the continuity of the service and the session.
A signaling interaction diagram of some embodiments of the UPF switching system of the present disclosure is shown in fig. 7. The terminal UE has a SSC mode 2 session anchored on the UPF1, and performs transmission of UL (uplink)/DL (downlink) data based on the path passing through the UPF 1; the UE has discovered a path for the session that needs to be anchored at the UPF2 that can provide better service for the traffic of the current session.
In 701, the SMF decides whether to immediately reassign an anchor point for a session according to the active state of the session. When the session enters an inactive state, the SMF determines an anchor point to reallocate the session.
In 702, the SMF sends a session release message to the AMF, where the session release message carries the reason value for release. In some embodiments, the relationship between the cause value and the processing logic may be pre-stored, and the terminal may determine the processing manner according to the cause value.
In 703, the AMF sends a session release message to the UE.
In 704, after receiving the session release message, the UE initiates a PDU session release procedure, releasing the session originally anchored in the UPF 1. In some embodiments, when the cause value in the session release message is a cause value corresponding to the session ending, the terminal ends the session; and when the reason value in the session release message is the reason value corresponding to the switching anchor point, the terminal ends the session and immediately reestablishes the session.
In 705, the UE determines to reinitiate the PDU session establishment procedure according to the cause value in the received session release message, establishes the session with the anchor point in the UPF2, completes the purpose of reallocating the anchor point for the session, and completes the transmission of uplink and downlink data by using the newly established path.
Compared with the related SSC mode 1, the UPF switching system has no routing detour, improves the transmission efficiency on one hand, and reduces the possibility of data damage. On the other hand, the resource waste of the intermediate node is reduced, and the limited resources are favorably utilized to provide services for more sessions; compared with the related SSC mode 2, the method can improve the service continuity; compared with SSC mode 3, the method has the advantages of reducing the requirement on the terminal capability, improving universality and being beneficial to popularization and application.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. 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.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the specific embodiments of the disclosure or equivalent substitutions for parts of the technical features may still be made; all such modifications are intended to be included within the scope of the claims of this disclosure without departing from the spirit thereof.
Claims (12)
1. A method for switching a User Plane Function (UPF) comprises the following steps:
under the condition that a terminal inquires that an existing session has a feasible path superior to the current path of the session, determining whether to immediately reallocate an anchor point according to the activation state of the session;
and under the condition of determining to reallocate the anchor point, releasing the original session, reestablishing the session and connecting to the reallocated anchor point.
2. The method of claim 1, wherein the determining whether to reassign an anchor point according to the activation status of the session comprises:
determining an activation status of the session;
determining a reassignment anchor point under the condition that the activation state is an inactivated state;
and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
3. The method of claim 1, wherein the existence of a feasible path that is better than a current path of the session comprises:
at least one of quality of service, category, or efficiency of the feasible path is better than the current path.
4. The method of claim 1, wherein the releasing the legacy session, reestablishing the session and connecting to the reassigned anchor point comprises:
a Session Management Function (SMF) informs the terminal to release the session through an access and mobility management function (AMF), wherein the determination of whether to immediately reassign an anchor point is performed by the SMF;
the terminal releases the session anchored in the current UPF;
and the terminal initiates a session establishment and is anchored in the UPF associated with the feasible path.
5. The method of claim 1, wherein,
the SMF notifying the terminal to release the session through the AMF comprises the following steps:
the SMF sends a session release message to the AMF, wherein the session release message comprises release reason information;
and the AMF sends the session release message to the terminal so that the terminal releases the session according to the release reason value and immediately initiates the session reestablishment.
6. A User Plane Function (UPF) switching device comprises:
the judging unit is configured to determine whether to immediately reallocate the anchor point according to the activation state of the session under the condition that the terminal inquires that the existing session has a feasible path which is superior to the current path of the session;
and the reconnection unit is configured to release the original session, reestablish the session and connect to the anchor point which is reallocated under the condition that the judgment unit determines to reallocate the anchor point.
7. The apparatus of claim 6, wherein the determining unit is configured to:
determining an activation status of the session;
determining a reassignment anchor point under the condition that the activation state is an inactivated state;
and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
8. A User Plane Function (UPF) switching device comprises:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-5 based on instructions stored in the memory.
9. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any one of claims 1 to 5.
10. A user plane function, UPF, switching system, comprising:
a terminal configured to query a feasible path of an existing session; releasing the original session according to the session release message, and initiating and reestablishing the session;
the session management function SMF is configured to determine whether to immediately reallocate an anchor point according to the activation state of the session under the condition that the terminal inquires that a feasible path superior to the current path of the session exists in the existing session; under the condition of determining to reallocate the anchor point, sending a session release message to an access and mobility management function (AMF);
an AMF configured to transmit the session release message to the terminal.
11. The system of claim 10, wherein the SMF is configured to:
determining an activation status of the session;
determining a reassignment anchor point under the condition that the activation state is an inactivated state;
and under the condition that the active state is the active state, maintaining the connection state of the session and the current anchor point until the anchor point is determined to be reallocated after the session enters the inactive state.
12. The system of claim 10, wherein the session release message includes release reason information;
the terminal is configured to release the session according to the release cause value and immediately initiate re-establishment of the session.
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| KR20190004217A (en) * | 2017-07-03 | 2019-01-11 | 한국전자통신연구원 | Method for pdu session anchor relocation and 5g network registration |
| CN109548186A (en) * | 2017-07-28 | 2019-03-29 | 展讯通信（上海）有限公司 | The method for relocating and device, readable storage medium storing program for executing and equipment of PDU session anchor point |
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