CN114449679A

CN114449679A - UPF connection method and device, electronic equipment and storage medium

Info

Publication number: CN114449679A
Application number: CN202011233572.6A
Authority: CN
Inventors: 盖剑; 刘蕾; 车忻蔚; 张巍山; 李红双
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Design Institute Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Design Institute Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2022-05-06

Abstract

The invention provides a method and a device for connecting UPF, electronic equipment and a storage medium. The method comprises the following steps: determining the TAI corresponding relation between the UPF and the base station according to the TAI range of the tracking area identification code of the UPF and the TAI of the base station; determining delay information from each base station to each corresponding UPF according to the TAI corresponding relation; and determining a target UPF according to the delay information and the base station information of the terminal, and connecting the terminal with the target UPF. The method and the device for connecting the UPF can realize the connection optimization of the terminal and the UPF, thereby reducing the service delay and improving the network efficiency.

Description

UPF connection method and device, electronic equipment and storage medium

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for connecting a UPF, an electronic device, and a storage medium.

Background

Generally, a terminal needs to access a UPF (User Plane Function) of a core network to access a data network.

The SMF (Session Management Function) of the core network selects the UPF according to a certain policy, thereby establishing a PDU (Protocol Data Unit) Session bearer for the terminal so as to perform Data transmission.

In the prior art, the SMF selects the UPF according to DNN (Data Network Name), slice, TAI (Tracking Area Identity), capacity, dynamic load, PDU session type, slice requested by the UE, TAI where the UE is located, and other factors for which the UPF is responsible.

Because the attributes (including responsible DNN, slice, TAI, capacity, PDU session type) of each UPF are the same in the same UPF pool, and the UPFs in the same pool cannot determine the distance to the terminal location according to the TAI. Therefore, in the same pool, the UPF is selected in a load sharing manner. That is, when the SMF selects the UPF, only the factors of the core network are considered, and whether the current transmission path from the UPF to the terminal is optimal or not is not considered, so that the transmission path from the UPF to the terminal may be longer, and the service delay may be longer.

Therefore, how to provide a method can optimize the connection between the terminal and the UPF, reduce the service delay, and has very important significance.

Disclosure of Invention

In view of the above-mentioned drawbacks in the prior art, the present invention provides a method for connecting UPFs, including:

determining the TAI corresponding relation between the UPF and the base station according to the TAI range of the tracking area identification code of the UPF and the TAI of the base station;

determining delay information from each base station to each corresponding UPF according to the TAI corresponding relation;

and determining a target UPF according to the delay information and the base station information of the terminal, and connecting the terminal with the target UPF.

In one embodiment, before determining the TAI correspondence between the UPF and the base station according to the TAI range of the UPF and the TAI to which the base station belongs, the method further includes:

obtaining UPF information and base station information;

wherein the UPF information includes a UPF ID and the TAI range;

the base station information includes a base station ID, a base station IP address, and the TAI.

In one embodiment, the determining delay information of each base station to each corresponding UPF includes:

and determining delay information from each base station to each corresponding UPF according to the IP address of the base station.

In an embodiment, before determining the target UPF according to the delay information and the base station information to which the terminal belongs, the method further includes:

determining candidate UPF from the UPF pool according to a preset rule;

wherein the candidate UPF includes the target UPF.

In one embodiment, the delay information includes:

a transmission time delay and a transmission path hop count from each base station to each corresponding UPF.

In one embodiment, the determining the target UPF according to the delay information and the information of the base station to which the terminal belongs includes:

determining the transmission time delay from the base station to which the terminal belongs to each corresponding UPF according to the base station ID in the base station information to which the terminal belongs;

and taking the UPF corresponding to the minimum transmission time delay as the target UPF.

In one embodiment, if there are more than one UPF corresponding to the minimum tti, the UPF is determined to be the smallest tti

Determining the hop counts of transmission paths from the base station to which the terminal belongs to the plurality of UPFs respectively;

and taking the UPF corresponding to the maximum transmission path hop number as the target UPF.

The invention also provides a device for connecting UPF, comprising:

the matching module is used for determining the corresponding relation between the tracking area identification code (TAI) of the UPF and the TAI of the base station according to the TAI range of the UPF and the TAI of the base station;

a determining module, configured to determine, according to the TAI correspondence, delay information from each base station to each corresponding UPF;

and the connection module is used for determining a target UPF according to the delay information and the base station information to which the terminal belongs and connecting the terminal with the target UPF.

The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of any one of the methods for connecting UPFs.

The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the above-described methods of connecting UPFs.

The method and the device for connecting the UPF provided by the invention can realize the connection optimization of the terminal and the UPF by determining the delay information from each base station to each corresponding UPF and selecting the target UPF for the terminal according to the delay information, thereby reducing the service time delay and improving the network efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a conventional terminal connection UPF;

FIG. 2 is a schematic flow chart of a method for connecting UPFs provided by the present invention;

FIG. 3 is a schematic diagram of the structure of a UPF connection device provided by the present invention;

fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.

To better describe the embodiments of the present invention, the following is first introduced:

the 5G wireless communication core network includes the following functions: the user plane function UPF is a session point of Data network interconnection of Protocol Data Units (PDUs), and has functions of packet routing, forwarding, and policy execution for packet Data. An Access and Mobility Management Function (AMF) provides functions of registration Management, connection Management, reachability Management, and Mobility Management, and collects User information and verifies a User identity when a User Equipment (UE) registers. Session Management Function (SMF), which provides functions of Session Management, policy control, and selection and control of UPF, and can download required user information from AMF.

The UE needs to access the UPF of the 5G core Network through a radio access Network (WAN) in order to access a Data Network (Data Network). The most important of the data connections is the selection of the UPF and the access to the 5G core network. There are many ways for the UE to select the UPF after accessing the 5G core network. Currently, in 3GPP specifications, in a PDU session bearer establishment process, an SMF selects an SSC mode, selects a UPF, and allocates a user IP address for the PDU session; wherein: the principle of the SMF selecting SSC mode, assigning user IP addresses should be based on the user migration data and the UE's request. The SMF selects UPF according to a certain strategy, thereby establishing PDU session bearing for users so as to carry out data transmission.

At present, when an operator deploys a 5G network, in order to save backbone network transmission bandwidth and reduce service delay, the UPF is usually sunk to core machine rooms in various cities for deployment. In order to satisfy the ultra-low delay service, in some cases, the service may further sink to a district computer room or even below the district computer room, so as to shorten the transmission distance as much as possible, reduce the service delay as much as possible, and improve the service perception.

In general, multiple sets of UPFs are deployed in each city, and the multiple sets of UPFs form a UPF POOL to implement network element level disaster recovery. To implement geographical disaster recovery, the UPF network elements within the pool are typically distributed over two or more local addresses.

In an actual network, when a UE performs a service, the UE first accesses a base station, and then the base station is connected to a UPF through a transport network, thereby establishing a session bearer and transmitting service data. In a large and super-huge local network, there are many intermediate nodes in the transmission network, and the base station to the UPF need to pass through many transmission devices such as an access ring, a common aggregation ring, an important aggregation ring, a core ring, and the like, as shown in fig. 1.

Because the UPF in the POOL is positioned at two different local addresses, the transmission paths from the same base station to the UPF at the two different local addresses are different. If more transmission devices pass through the transmission path, the longer the transmission path is, the service delay will be increased, and the whole traffic load of the transmission network will be increased.

As shown in fig. 1, the UE1 is located in the range of TA1, geographically closer to the UPF1, shorter transmission path, farther from the UPF2, longer transmission path; the UE2 is located within the TA2, geographically closer to the UPF2, shorter transmission path, farther from the UPF1, and longer transmission path. According to the existing UPF selection mechanism, the SMF selects the UPF according to the DNN, the slice, the TAI, the capacity, the dynamic load, the PDU session type, the slice requested by the UE, the TAI where the UE is located and other factors which are responsible for the UPF.

Because the attributes (including the responsible DNN, slice, TAI, capacity, and PDU session type) of each UPF are the same in the same UPF POOL, and the UPF in the same POOL cannot determine the distance from the UE location according to the TAI, the UPF is selected in a load sharing manner in the same POOL. It is possible for the SMF to select the UPF2 for the UE1 and the UPF1 for the UE 2.

Fig. 2 is a schematic flow chart of a method for connecting UPFs provided by the present invention, and referring to fig. 2, the method includes:

s210, determining a TAI corresponding relation between the UPF and the base station according to the TAI range of the UPF and the TAI of the base station;

s220, determining delay information from each base station to each corresponding UPF according to the TAI corresponding relation;

and S230, determining a target UPF according to the delay information and the base station information of the terminal, and connecting the terminal with the target UPF.

The execution main body of the method for connecting UPF provided by the invention can be a core network.

Specifically, an OMC (Operation and Maintenance Center) in the core network may determine a correspondence relationship between the UPF and the TAI of the base station according to a TAI range (including a plurality of TAIs) for which the UPF is responsible and the TAI to which the base station gNB belongs.

The TAI correspondence may be embodied as all gnbs corresponding to the TAI range for which each UPF is responsible.

The OMC may specifically embody the TAI correspondence as a < UPF-gNB > information record table, as follows:

TABLE 1< UPF-gNB > information recording Table

After the OMC determines the < UPF-gNB > information record table, the gNB information corresponding to the UPF is issued to each UPF so that the UPF measures its delay information to each gNB. Then, the OMC receives the delay information reported by each UPF and performs summary statistics to determine the delay information from each gNB to each corresponding UPF, and sends the delay information to the SMF of the core network.

After receiving the delay information, the SMF of the core network determines a target UPF according to the delay information and the base station information of the terminal, and connects the terminal with the target UPF.

The method for connecting the UPF provided by the invention can realize the connection optimization of the terminal and the UPF by determining the delay information from each base station to each corresponding UPF and selecting the target UPF for the terminal according to the delay information, thereby reducing the service time delay and improving the network efficiency.

Further, in an embodiment, before step S210, the method for connecting UPFs provided by the present invention may further include:

s200, obtaining UPF information and base station information;

wherein, the UPF information comprises UPF ID and TAI range; the base station information includes a base station ID, a base station IP address, and a TAI.

Specifically, the base station may exchange configuration data in association with its home AMF creation N2 interface. At this time, the AMF may acquire and store the base station information. The base station information may include a base station ID, a base station IP address, a TAI to which the base station belongs, and the like.

The AMF checks the ID of the base station, and if a new base station is judged, the AMF reports the base station information of the base station to the OMC. The OMC may also instruct the AMF to report all the stored base station information. And the OMC stores the base station information after acquiring the base station information.

Specifically, the SMF may interact with configuration data associated with the UPF creation N4 interface to which it belongs. At this point, the SMF may obtain and save the UPF information. The UPF information may include a UPF ID, a responsible TAI range, and the like.

The SMF checks the UPF ID, if a new UPF is judged, the SMF reports UPF information of the UPF to the OMC. The OMC can also command the SMF to report the information of all UPFs governed by the SMF. And the OMC stores the UPF information after acquiring the UPF information.

After acquiring the UPF information and the base station information, the OMC determines the TAI correspondence between the UPF and the base station according to the acquired UPF information and the base station information, and generates a < UPF-gNB > information record table shown in table 1.

It can be understood that, when the OMC receives new base station information or new UPF information, it updates the correspondence between the UPF and the TAI of the base station, i.e. updates the new base station information or the new UPF information into the < UPF-gNB > information record table.

The method for connecting UPF provided by the invention can realize the quick and/or implementation acquisition of the base station information and the UPF information by acquiring the base station information through the AMF of the core network and acquiring the UPF information through the SMF of the core network, thereby improving the UPF connecting efficiency and instantaneity.

Further, in an embodiment, determining delay information from each base station to each corresponding UPF may include:

and determining the delay information from each base station to each corresponding UPF according to the IP address of the base station.

Specifically, the OMC issues the IP addresses of all base stations corresponding to the UPF to each UPF in the table according to the < UPF-gNB > information record table, and commands each UPF to measure the delay information between the UPF and all base stations within the TAI range for which it is responsible, so as to obtain the delay measurement record between the UPF and the base station, as shown in table 2 by way of example. The delay measurement record may include transmission time delay from the UPF to the base station, the hop count of the transmission path, and the like.

TABLE 2 delay measurement log table

UPF ID	gNB ID	Delay of transmission time	Number of transmission path hops
				UPF01	gNB01	10	6
UPF01	gNB02	14	10
				UPF01	……	……	……

It should be noted that the OMC may instruct the UPF to perform the delay measurement when the network is idle, for example, between 2 and 4 hours in the early morning, so as to reduce the impact on the network.

After obtaining the delay measurement record from the UPF to the base station, the UPF reports the delay measurement record to the OMC, and the OMC summarizes all delay measurement record reports sent by the UPF and counts and summarizes the reports to determine the delay information from each base station to each corresponding UPF.

The delay information may include a transmission time delay from each base station to each corresponding UPF, a hop count of a transmission path, and the like.

The delay information may be embodied as a < gNB-UPF > delay information record table, as shown in table 3.

TABLE 3< gNB-UPF > delay information recording Table

gNB ID	UPF ID	Delay of transmission time	Number of transmission path hops
				gNB01	UPF01	10	6
gNB01	UPF02	14	10
				gNB02	UPF01	11	6
gNB02	UPF02	12	8
				……	……	……	……

The method for connecting UPF provided by the invention can quickly and accurately determine the detailed delay information of the base station and the UPF by determining the delay measurement record from each corresponding UPF to each base station according to the IP address of the base station and summarizing the delay measurement records reported by all the UPFs to determine the delay information from each base station to each corresponding UPF, thereby providing a basis for determining the target UPF to be connected by the terminal.

After generating the delay information record table of < gNB-UPF >, the OMC will issue the table to each SMF, and store it in the SMF as the local configuration policy of the operator for selecting UPF.

Further, in an embodiment, before determining the target UPF according to the delay information and the base station information to which the terminal belongs, the method for connecting UPFs provided by the present invention may further include:

determining candidate UPF from the UPF pool according to a preset rule; wherein, the candidate UPF includes the target UPF.

Specifically, when the terminal initiates a PDU session bearer establishment request, the SMF first selects a group of UPFs from the UPF pool as candidate UPFs according to a preset rule.

Wherein, the preset rule may include:

determining candidate UPFs based on one or more of the following parameters:

DNN, slice, TAI, service functions supported by the UPF (user address type, SSC mode, etc.), geographical location of the UPF, responsible TAI range, and current geographical location of the UE, capacity/load of the UPF, subscription data of the UE, policy data, etc.

If the number of candidate UPFs selected by the SMF from the UPF pool according to the preset rule is 1, the candidate UPF is selected to be used as a target UPF to execute a subsequent PDU session bearer establishment flow.

If the SMF selects a plurality of candidate UPFs from the UPF pool according to the preset rule, the SMF determines the candidate UPF with the shortest transmission time delay from the plurality of candidate UPFs according to the < gNB-UPF > time delay record table which is stored by the SMF and issued by the OMC, and the candidate UPF is used as the target UPF to execute the subsequent PDU conversation and establish the bearing process.

If the transmission time delays of a plurality of candidate UPFs are the same, the SMF selects the candidate UPF with the largest hop count as a target UPF to execute the subsequent PDU session establishment bearer flow.

According to the method for connecting UPFs, the candidate UPFs are screened out according to the preset rule, and the target UPF is selected from the candidate UPFs according to the delay information, so that the selected UPF can meet the performance requirement, the selected UPF can have short time delay, and the network quality is remarkably improved.

Of course, the SMF may also determine the target UPF directly from the delay information. For example, in one embodiment, determining the target UPF according to the delay information and the information of the base station to which the terminal belongs includes:

Specifically, the SMF may acquire information of a base station to which the terminal belongs, determine a base station ID from the information of the base station to which the terminal belongs, determine a transmission time delay from the base station to each corresponding UPF from a < gNB-UPF > time delay record table according to the base station ID, regard the UPF corresponding to the minimum transmission time delay as a target UPF, and perform a subsequent PDU session establishment bearer flow based on the target UPF.

Optionally, in this embodiment, if there are multiple UPFs corresponding to the minimum tti, the number of the UPFs is smaller than the minimum tti

Specifically, if the SMF determines the transmission time delay from the base station to which the terminal belongs to the < gNB-UPF > time delay record table to the corresponding UPFs, and finds that there are multiple UPFs corresponding to the minimum transmission time delay, it will further determine the number of hops from the base station to which the terminal belongs to the transmission paths to the multiple UPFs, and take the UPF corresponding to the maximum number of hops from the transmission path as the target UPF, and execute the subsequent PDU session establishment bearer flow based on the target UPF.

The method for connecting the UPF provided by the invention can further improve the speed of the terminal for connecting the UPF by directly determining the target UPF according to the information of the base station to which the terminal belongs, thereby further improving the network speed.

It will be appreciated that the terminals are mobile throughout the network. When the position of the terminal changes, especially after the position changes widely, the transmission path and the transmission delay between the terminal and the UPF will change, which may cause the transmission path after the terminal moves not to be the optimal path.

Therefore, when the terminal performs mobile update registration (registration update is caused by a change in the TA where the terminal is located), the SMF reselects a target UPF for the terminal to perform a subsequent PDU session bearer update procedure according to the method for connecting UPFs provided in the above embodiment based on the base station information of the new base station to which the terminal belongs, thereby ensuring that the UPF with the shortest transmission time delay can be always selected for the terminal.

In summary, the method for connecting UPFs provided by the present invention can reduce the service delay, improve the service awareness, reduce the turnaround traffic, and reduce the entire transmission load by selecting the UPF with the shortest transmission time delay between the base station and the UPF.

On the basis of the above embodiments, the present invention also provides an AMF apparatus, including: a first unit and a second unit;

the first unit is used for acquiring and storing base station information reported by the gNB; receiving a reporting command issued by the OMC;

and the second unit is used for reporting the base station information to the OMC according to the reporting command.

On the basis of the above embodiments, the present invention further provides an SMF apparatus, including: a first unit, a second unit, and a third unit;

the first unit is used for acquiring and storing UPF information; receiving a reporting command issued by the OMC;

the second unit is used for reporting the UPF information to the OMC according to the reporting command;

and the third unit is used for receiving the delay information issued by the OMC and storing the delay information as a local configuration strategy of an operator, so that the SMF can select the UPF.

On the basis of the above embodiments, the present invention further provides a UPF apparatus, including: a first unit and a second unit;

the first unit is used for receiving a measurement request issued by the OMC;

and measuring the transmission time delay from the UPF to the gNB according to the measurement request, and reporting the measurement result to the second unit.

And the second unit generates a transmission time delay measurement record according to the measurement result and reports the transmission time delay measurement record to the OMC.

On the basis of the above embodiments, the present invention further provides an OMC apparatus, including: a first unit, a second unit, and a third unit;

the first unit is used for commanding the AMF to report the base station information and commanding the SMF to report the UPF information;

generating an information record table of < UPF-gNB > according to the base station information and the UPF information;

the second unit is used for commanding the UPF in the table to measure the transmission time delay from the UPF to the gNB of the TA range which is responsible for the UPF according to the < UPF-gNB > information record table;

the third unit is used for receiving the transmission time delay measurement record reported by the UPF and generating a < gNB-UPF > delay information record table according to the transmission time delay measurement record;

and issuing the < gNB-UPF > delay information record table to the SMF.

The present invention also provides a device for connecting UPFs, as shown in fig. 3, the device including:

the matching module 310 is configured to determine a TAI corresponding relationship between a user plane function UPF and a base station according to a TAI range of a tracking area identifier TAI of the UPF and a TAI to which the base station belongs;

a determining module 320, configured to determine delay information from each base station to each corresponding UPF according to the TAI correspondence;

and the connection module 330 is configured to determine a target UPF according to the delay information and the base station information to which the terminal belongs, and connect the terminal with the target UPF.

The UPF connecting device provided by the invention can realize the connection optimization of the terminal and the UPF by determining the delay information from each base station to each corresponding UPF and selecting the target UPF for the terminal according to the delay information, thereby reducing the service delay and improving the network efficiency.

In one embodiment, the apparatus for connecting UPFs provided by the present invention may further include:

an obtaining module (not shown) for obtaining the UPF information and the base station information;

wherein, the UPF information comprises UPF ID and TAI range;

the base station information includes a base station ID, a base station IP address, and a TAI.

In one embodiment, the determining module 320 is specifically configured to:

determining delay information from each base station to each corresponding UPF according to the IP address of the base station

Wherein the delay information includes: the transmission time delay from each base station to each corresponding UPF and the number of transmission path hops.

In one embodiment, the connection module 330 is specifically configured to:

determining candidate UPF from the UPF pool according to a preset rule;

wherein, the candidate UPF includes the target UPF.

In one embodiment, the connection module 330 is specifically configured to:

In an embodiment, the connection module 330 is further specifically configured to:

if there are multiple UPFs corresponding to the minimum transmission time delay, then

Determining the hop counts of transmission paths from a base station to which the terminal belongs to a plurality of UPFs respectively;

Fig. 4 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 4: a processor (processor)410, a Communication Interface (Communication Interface)420, a memory (memory)430 and a Communication bus 440, wherein the processor 410, the Communication Interface 420 and the memory 430 are communicated with each other via the Communication bus 440. The processor 410 may invoke logic instructions in the memory 430 to perform the steps of the method of connecting UPFs, including, for example:

determining the TAI corresponding relation between the UPF and the base station according to the TAI range of the UPF and the TAI of the base station;

In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the steps of the method for connecting UPFs provided by the above method embodiments, for example, including:

In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method for connecting UPFs provided in the foregoing embodiments, for example, the method includes:

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for connecting UPFs, comprising:

2. The method according to claim 1, wherein before determining the TAI mapping relationship between the UPF and the base station according to the TAI range of the UPF and the TAI to which the base station belongs, the method further comprises:

obtaining UPF information and base station information;

wherein the UPF information includes UPFID and the TAI range;

3. The method of claim 2, wherein the determining delay information for each base station to each corresponding UPF comprises:

4. The method for connecting UPFs according to claim 1, further comprising, before determining a target UPF according to the delay information and information of a base station to which the terminal belongs:

determining candidate UPF from the UPF pool according to a preset rule;

wherein the candidate UPF includes the target UPF.

5. A method of UPF connection according to any of claims 1-4, characterized in that said delay information comprises:

6. The method of claim 5, wherein the determining a target UPF according to the delay information and the information of the base station to which the terminal belongs comprises:

7. The method according to claim 6, wherein if there are more than one UPF corresponding to the minimum TTD, the method further comprises

8. An apparatus for connecting UPFs, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the method of connecting UPFs according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of connecting UPFs according to any one of claims 1 to 7.