CN112449367B

CN112449367B - Data transmission method and core network equipment

Info

Publication number: CN112449367B
Application number: CN201910803742.0A
Authority: CN
Inventors: 魏群; 马瑞涛
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2023-05-26
Anticipated expiration: 2039-08-28
Also published as: CN112449367A

Abstract

The embodiment of the invention provides a data transmission method and core network equipment, relates to the technical field of communication, and solves the problem of how to establish a transmission channel between UE and UPF and simultaneously ensure that the transmission delay of the transmission channel is the lowest. The method comprises the steps of receiving a bearer establishment request sent by UE; acquiring a service type and a service transfer point list of the UE; determining a service transfer point meeting a preset condition in a service transfer point list according to a service type after establishing a temporary channel of any service transfer point in the service transfer point list after establishing a UE and a UPF control plane negotiation before establishing a transmission channel according to a request for establishing a bearer; and when the service transfer point corresponding to the temporary channel is determined to be different from the service transfer point meeting the preset condition, releasing the temporary channel, and re-establishing the transmission channel between the UE and the service transfer point meeting the preset condition.

Description

Data transmission method and core network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method and a core network device.

Background

In a fifth generation mobile communication technology (english full name: 5th-generation, abbreviated as 5G) network architecture, an edge computing technology enables operators and third party services to be deployed to access points close to User Equipment (UE), so that end-to-end delay and transmission network load are reduced, and more efficient service delivery is achieved. The implementation principle is that a 5G core network selects a user plane functional entity (English full name: user plane function, abbreviated as UPF) close to UE, and directs service traffic to a local data network through an N6 interface on the UPF; in practical applications, a plurality of UPFs may be deployed at the same location, which results in a problem that when a core network selects a UPF serving the UE, the UE-to-UPF data transmission delay is not the lowest.

Therefore, how to establish a transmission channel between a UE and a UPF while ensuring that the transmission delay of the transmission channel is minimized is a problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a data transmission method and core network equipment, which solve the problem of how to establish a transmission channel between UE and UPF and simultaneously ensure the minimum transmission delay of the transmission channel.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a data transmission method, including: receiving a bearer establishment request sent by UE; the method comprises the steps that a bearer request is established and used for indicating core network equipment to establish a transmission channel between UE and a service transfer point; acquiring a service type and a service transfer point list of the UE; the service transfer point list comprises at least one service transfer point capable of establishing a bearing; determining a service transfer point meeting a preset condition in a service transfer point list according to a service type after establishing a temporary channel of any service transfer point in the service transfer point list after establishing a UE and a UPF control plane negotiation before establishing a transmission channel according to a request for establishing a bearer; releasing the temporary channel when the service transfer point corresponding to the temporary channel is different from the service transfer point meeting the preset condition, and re-establishing the transmission channel between the UE and the service transfer point meeting the preset condition; wherein, the data transmission delay of the transmission channel is the lowest.

As can be seen from the above solution, in the data transmission method provided by the embodiment of the present invention, when the service requested by the UE has a high requirement on service setup delay, and when it is determined that the UPF control plane negotiation is not required before the transmission channel is established according to the request for establishing the bearer, a temporary channel between the UE and any service transfer point in the service transfer point list is established, so that the request for establishing the bearer of the UE is responded at the fastest speed; meanwhile, in order to ensure that the data transmission delay between the service transfer point and the UE is the lowest, after a temporary channel is established, determining the service transfer point meeting the preset condition in the service transfer point list according to the service type; when the service transfer point corresponding to the temporary channel is determined to be different from the service transfer point meeting the preset condition, releasing the temporary channel, and re-establishing the transmission channel between the UE and the service transfer point meeting the preset condition, so as to ensure the experience of the user; the method solves the problem of how to establish the transmission channel between the UE and the UPF and simultaneously ensure the minimum transmission delay of the transmission channel.

In a second aspect, an embodiment of the present invention provides a core network device, including: a receiving unit, configured to receive a bearer establishment request sent by a UE; the method comprises the steps that a bearer request is established and used for indicating core network equipment to establish a transmission channel between UE and a service transfer point; an acquiring unit, configured to acquire a service type and a service transfer point list of a UE; the service transfer point list comprises at least one service transfer point capable of establishing a bearing; the processing unit is used for determining a service transfer point meeting a preset condition in the service transfer point list according to the service type after establishing a temporary channel of any service transfer point in the service transfer point list acquired by the UE and the acquisition unit when determining that UPF control plane negotiation is not needed before establishing a transmission channel according to the bearer establishment request received by the receiving unit; the processing unit is further used for releasing the temporary channel and re-establishing the transmission channel of the UE and the service transfer point meeting the preset condition when the service transfer point corresponding to the temporary channel is different from the service transfer point meeting the preset condition; wherein, the data transmission delay of the transmission channel is the lowest.

In a third aspect, an embodiment of the present invention provides a core network device, including: communication interface, processor, memory, bus; the memory is configured to store computer-executable instructions, and the processor is coupled to the memory via a bus, the processor executing the computer-executable instructions stored in the memory when the core network device is operating, to cause the core network device to perform the method as provided in the first aspect above.

In a fourth aspect, embodiments of the present invention provide a computer storage medium comprising instructions which, when run on a computer, cause the computer to perform the method as provided in the first aspect above.

It can be appreciated that any of the core network devices provided above is configured to perform the method corresponding to the first aspect provided above, and therefore, the advantages achieved by the core network device may refer to the method of the first aspect and the advantages of the corresponding scheme in the following detailed description, which are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a network architecture diagram of a data transmission method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a PDU session establishment procedure in the prior art;

fig. 3 is a schematic flow chart of a data transmission method according to an embodiment of the present invention;

FIG. 4 is a second flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 5 is a third flow chart of a data transmission method according to an embodiment of the invention;

fig. 6 is a schematic diagram of a deployment distance of a data transmission method according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a core network device according to an embodiment of the present invention;

fig. 8 is a second schematic structural diagram of a core network device according to an embodiment of the present invention.

Reference numerals:

core network equipment-10;

a receiving unit-101; an acquisition unit-102; a processing unit-103.

Detailed Description

Embodiments of the present invention are described below with reference to the accompanying drawings.

In order to clearly describe the technical solution of the embodiments of the present invention, in the embodiments of the present invention, the terms "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect, and those skilled in the art will understand that the terms "first", "second", etc. are not limited in number and execution order.

In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present invention, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, a plurality of networks refers to two or more networks.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. The symbol "/" herein indicates that the associated object is or is a relationship, e.g., A/B indicates A or B.

The UE in the embodiment of the invention can be an intelligent mobile terminal, an unmanned aerial vehicle (English full name: unmanned aerial vehicle/drones, abbreviated as UAV) or an intelligent automobile. The intelligent mobile terminal is a mobile terminal with an operating system. The intelligent mobile terminal can be: terminal devices such as smart phones, tablet computers, notebook computers, ultra-mobile personal computers (english full name: ultra-mobile personal computer, abbreviated as UMPC), netbooks, personal digital assistants (english full name: personal digital assistant, abbreviated as PDA), smart watches, smart bracelets, or the like, or the smart mobile terminals may be other types of smart mobile terminals, and embodiments of the present invention are not limited in particular.

The data transmission method provided by the embodiment of the invention is applied to the network architecture shown in fig. 1, and comprises the following steps: UE, base station (english full name: eNodeB), radio access network (english full name: radio access network, RAN), access and mobility management function entity (english full name: access and mobility management function, AMF), session management function entity (english full name: session management function, SMF), policy control function entity (english full name: policy control function, PCF), home subscriber server (english full name: unified data management, UDM), target network (english full name: destination network, DN), UPF and application function (english full name: application Function, AF); the RAN comprises a base station (English: enhanced node B, eNodeB); as shown in fig. 2, when the UE establishes a protocol data unit (english: protocol Data Unit, abbreviated as PDU) session, the UE sends a NAS message to the AMF, carrying a PDU session establishment bearer request; secondly, AMF performs SMF selection based on information such as request type, NSSAI and the like; thirdly, AMF sends PDU session establishment context request to SMF; fourthly, SMF calls (user database Registration) Nudm_UECM_Registration to register in the UDM for the PDU Session; fifthly, returning (PDU session Context creation feedback) Nsmf_PDUSation_ CreateSMContext Response to the AMF, wherein the Nsmf_PDUSation_ CreateSMContext Response carries Cause and (session management Context ID) SM Context ID; sixth, SMF executes PCF selection function; seventh, SMF executes Session Management Policy Establishment flow (session management policy establishment) to obtain default PCC rules for PDU session; eighth, SMF selects SSC Mode for PDU conversation, executes UPF selection, and distributes IPv6 prefix for UE; ninth, the SMF sends (N4 interface session establishment bearer request) N4 Session Establishment Request message to the UPF; tenth step, the UPF responds (N4 interface session establishment response) to the SMF with an N4 Session Establishment Response message; eleventh step, SMF initiates (Communication N1N2message transmission) namf_communication_n1n2message to AMF, carrying allocated IP address, qoS information, and (PDU session establishment accept) PDU Session Establishment Accept; twelfth step, AMF sends (N2 interface PDU session request) N2 PDU Session Request to RAN, carries (PDU session establishment acceptance) PDU Session Establishment Accept; thirteenth step, RAN transmits NAS message to UE; fourteenth step, the RAN sends (N2 interface PDU session response) N2 PDU Session Response to the AMF, carrying (access network channel information) AN Tunnel Info; fifteenth step, AMF sends (PDU session content update request) Nsmf_PDUSion_ UpdateSMContext Request to SMF; sixteenth, the SMF sends (N4 bearer modification) N4 Session Modification to the UPF, providing AN tunnel info; seventeenth step, the UPF returns (N4 bearer modification response) N4 Session Modification Response to the SMF; eighteenth step, SMF sends (PDU session content update response) nsmf_pduse_ UpdateSMContext Response (Cause) to AMF; nineteenth, the SMF sends (IPv 6 routing broadcast) IPv6 Router Advertisement to the UE through the UPF, thereby establishing a PDU session of the UE with the AF.

When the session management function entity (session management function, abbreviated as SMF) performs session selection and service continuous Mode (Session and Service Continuity Mode, abbreviated as SSC Mode) for PDU session in the eighth step, UPF selection is performed, and an IPv6 (internet protocol version 6) prefix is allocated to the UE, the core network selects a nearby UPF to provide service for the UE; however, in practical applications, multiple UPFs may be deployed at the same location, resulting in a problem that when the core network selects a UPF serving the UE, the UE-to-UPF data transmission delay is not the lowest; in order to solve the above problems, in the data transmission method provided by the embodiment of the present invention, a bearer establishment request sent by a UE is received; acquiring a service type and a service transfer point list of the UE; determining a service transfer point meeting a preset condition in a service transfer point list according to a service type after establishing a temporary channel of any service transfer point in the service transfer point list after establishing a UE and a UPF control plane negotiation before establishing a transmission channel according to a request for establishing a bearer; when the service transfer point corresponding to the temporary channel is determined to be different from the service transfer point meeting the preset condition, the temporary channel is released, and the transmission channel between the UE and the service transfer point meeting the preset condition is re-established, so that the minimum data transmission delay from the UE to the AF can be ensured, and the user experience is ensured.

Illustratively, taking a service transfer point as a UPF as an example, the specific implementation process is as follows:

example 1

An embodiment of the present invention provides a data transmission method, as shown in fig. 3, including:

s101, receiving a bearer establishment request sent by UE; the bearer establishment request is used for indicating the core network equipment to establish a transmission channel between the UE and the service transfer point.

It should be noted that, in an actual application, it is assumed that the UE has already established a transmission channel with UPF1, and the transmission channel may be used to transmit a traffic flow for providing services to the application or a traffic flow generated for signaling. In both cases, the UE already has an old PDU bearer ID (which is used to indicate the transmission channel). When the UE initiates a new PDU setup bearer request (including an activated PDU session identity (which is a new PDU session ID allocated by the UE for detection, old PDU anchor point information (optional), old RAN anchor point identity, fast detection identity)), the "activated PDU session identity" herein may be a PDU triggered by an existing traffic flow or an PDU triggered by an existing signaling flow.

And after the AMF receives the bearer establishment request, forwarding the bearer establishment request to the corresponding core network equipment. After the core network device receives the bearer establishment request, the active PDU session identifier and the fast detection identifier are detected, and if the same session identifier exists in the session identifier related to the UE and the PDU session identifier which is expected to be activated, the core network device returns an error cause value, such as undetectable, etc. (the active PDU session identifier should be newly allocated and cannot be already available). If not, the core network device detects whether the PDU session identity that is desired to be activated is in the local data network, and if not, the PDU session cannot be serviced in the residence area. If the PDU session identifier which is expected to be activated belongs to the local data network, the core network equipment side judges whether the UE signs up with the rapid detection function according to the sign up of the network (which is equivalent to that the UPF control plane negotiation is not needed before the transmission channel is established). The core network device can complete by inquiring the subscription information of the UE in the user database UDM, and if the UE does not sign a subscription with the rapid detection function, the network performs a multi-bearer flow specified by other standards, and feeds back an error cause value, for example, the error cause value cannot be detected.

Specifically, the UE determines, according to the service type of the service request, whether to perform UPF control plane negotiation, including:

the UE is according to the business type of the business request; the service types include: traffic with a traffic setup delay less than or equal to a delay threshold (also referred to as low-delay traffic) and traffic with a traffic setup delay greater than a delay threshold (also referred to as traffic setup delay insensitive traffic).

And when the UE determines that the requested service type is the low-delay service, the UE determines that UPF control plane negotiation is not needed.

When the UE determines that the requested service type is the service establishment delay insensitive service, the UE determines that UPF control plane negotiation is required.

S102, acquiring a service type and a service transfer point list of UE; wherein the service switching point list comprises at least one service switching point capable of establishing a bearer.

S103, according to the request for establishing the bearing, when the UPF control plane negotiation is not needed before the transmission channel is established, after the temporary channel of any service transfer point in the UE and the service transfer point list is established, the service transfer point meeting the preset condition in the service transfer point list is determined according to the service type.

In practical application, when the service requested by the UE has high requirement on service establishment delay, because the core network device determines that the optimal UPF needs a certain time, the core network device establishes a temporary channel of any service transfer point in the UE and the service transfer point list according to the establishment of the bearer request when it determines that the UPF control plane negotiation is not needed before the transmission channel is established, thereby responding to the establishment of the bearer request of the UE most quickly and ensuring the experience of the user; and simultaneously, the core network equipment continuously judges whether the service switching point is an optimal service switching point.

Specifically, when the core network device receives a bearer establishment request sent by the UE, the UE may support a preset identifier, where the identifier indicates whether the UE needs to perform UPF control plane negotiation before the core network device should establish the bearer request; for example: preset identification=1, which indicates that the UPF control plane negotiation is required before the core network device should establish the bearer request, and preset identification=0, which indicates that the UPF control plane negotiation is not required before the core network device should establish the bearer request; that is, the preset is carried, so that when the core network device receives a bearer establishment request sent by the UE, if the terminal carries the preset identifier, the service transfer point list of the UE needs to be determined instead of a single UPF.

S104, when the service transfer point corresponding to the temporary channel is determined to be different from the service transfer point meeting the preset condition, releasing the temporary channel, and reestablishing the transmission channel of the UE and the service transfer point meeting the preset condition; wherein, the data transmission delay of the transmission channel is the lowest.

Specifically, when the service switching point corresponding to the temporary channel is determined to be the same as the service switching point meeting the preset condition, continuing to establish the transmission channel between the UE and the service switching point meeting the preset condition.

Optionally, the method further includes, as shown in fig. 4:

s105, when the UPF control plane negotiation is required before the transmission channel is established according to the bearer establishment request, determining the service transfer points meeting the preset conditions in the service transfer point list according to the service types, and establishing the transmission channel between the UE and the service transfer points meeting the preset conditions.

In practical application, when the service requested by the UE has a low requirement on service setup delay, and when it is determined that the UPF control plane negotiation is required before the transmission channel is set up according to the request for setting up the bearer, a service transfer point meeting a preset condition in the service transfer point list is determined according to the service type, so that user experience is ensured.

Specifically, when the core network device determines that the UE signs a subscription to the fast detection function, and the original user only has one PDU bearer (i.e. the UE establishes a transmission channel with the UPF 1) and one PDU anchor point, and the anchor point cannot be changed, it needs to be first converted into the multi-anchor point mode. If the UE has only one PDU carrying one PDU anchor point, but the anchor point can be modified, it is necessary to switch to the multiple anchor point mode first. The core network device can sequentially establish the bearer for each UPF according to the network capability and the UE capability according to at least one UPF (e.g., UPF2, UPF3, UPF4, UPF 5) capable of establishing the bearer in the service transfer point list of the UE, and can also establish the bearer for a plurality of UPF addresses simultaneously.

Specifically, when the core network device supports segment detection, the destination address of the bearer establishment request of the UE is modified to (UPF 2, UPF3, UPF4, UPF 5). Bearer establishment by the UE for UPF2, UPF3, UPF4, UPF5 is performed. If the sequence detection is performed, a UE-to-UPF 2 transmission channel needs to be established first (at this time, the UE-to-UPF 2 transmission channel is only used to test the delay value of the transmission channel, and the transmission channel needs to be released after the test is completed (i.e. the UE is disconnected from the UPF 1)), and then a UE-to-UPF 3 transmission channel needs to be established until the UE-to-service transfer point list transmission channel of each UPF is completed. Alternatively, parallel detection may be employed when UPF and UE capabilities allow. I.e. from UE to UPF2, UPF3, UPF4, UPF5, multiple transmission channels are established for simultaneous detection.

For example, taking sequence detection as an example, the core network device selects a suitable UPF2 through message interaction of the N4 interface, establishes a new anchor point UPF2, and if the new anchor point UPF2 is a service based on source IPv6, further needs to allocate an IPv6 prefix for the PDU session; the core network device updates the new anchor point UPF2 information to the RAN over the N11 interface via the SM message function of N2, which is a new path from the RAN to UPF2, if the RAN already has a bearer for this UE and the old RAN anchor point before, the RAN determines whether a new anchor point needs to be allocated. If the RAN has assigned a new anchor point, the core network device updates the UPF2 with the connection information between the new RAN anchor point and the UPF 2. If the RAN does not assign a new anchor point, the core network device updates the UPF2 with connection information between the old RAN anchor point and the UPF 2.

All uplink detection information passes through the RAN anchor point to be used as a signaling bifurcation point, and the uplink detection information is bifurcated according to 1 when passing through the bifurcation point: 1 and simultaneously to UPF1 and UPF2; the bifurcation point can distinguish the flow into the detected service flow through the head detection mark in the detection information, the flow distinguished by the detection mark can be sent to UPF2 by the bifurcation point, and other non-detected service flows are still sent to UPF1. If this is a source IPv6 based traffic, the bifurcation can identify that this is a detected traffic flow by distinguishing between source IPv6 based prefixes, and thus will be sent by the bifurcation to UPF2, while other non-detected traffic flows are still sent to UPF1. And all downlink data are transmitted to the UE in a combined mode when passing through the RAN anchor point.

The core network device needs to update the bearer of the UPF1 to inform the UPF1 of the bifurcation point information so that the downlink data are combined at the bifurcation point.

The core network device needs to update the bearer of the UPF2 to inform the UPF1 of the bifurcation point information so that the downlink data are combined at the bifurcation point.

After receiving the detected service flow forwarded by the bifurcation point, the UPF with the segmented rapid detection exchanges the source and destination addresses of the five-tuple of the service flow, and feeds back the detected service packet to the bifurcation point. But cannot modify the packet identity, e.g. the detection packet identity sent by the UE includes: packet identification 1: content; packet identification 2: the content, the bifurcation point, after accepting the feedback packet, forwards to the UE and carries the address information of UPF2, so that the UE distinguishes between UPF1 and UPF2 after receiving.

Releasing the bearing after finishing the detection of UPF2, but keeping the bearing of UPF1, and continuing to detect UPF3; after the establishment of the bearer of the UPF3 is completed, the bearer information of the bifurcation still needs to be updated to complete the merging of the downlink data packets.

The core network equipment determines that a service transfer point meeting a preset condition exists in a service transfer point list according to the service type; for example, when the service transfer point satisfying the preset condition is UPF2, the new PDU bearer ID allocated by the UE is used, and the PDU session establishment procedure shown in fig. 1 is adopted, so that the bearer between the UE and the UPF1 is released after the bearer between the UE and the UPF2 is established. Or firstly releasing the bearing between the UE and the UPF1, and then establishing the bearing between the UE and the UPF 2.

Specifically, whether the core network device adopts segment detection or not can be configured according to the actual running condition, so as to prevent the UE from measuring network detection data packets in large quantity.

Specifically, if the core network device does not adopt segment detection, according to the network configuration, the UE detection service flow can be directly sent to the AF side, and the AF side feeds back the detection service packet to the UE, but the actual service flow of the UE is still dredged from the UPF 1.

Specifically, when the UE establishes a temporary channel with a plurality of UPFs and maintains a transmission channel with the UPF1 at the same time, after the UE completes the measurement in the early stage of handover, the UE needs to complete the pull-through of the bearer with the network anchor point, at this time, the handover message is sent to the bifurcation point (RAN), and the bifurcation point sends the handover request to the UPF1, where the UPF1 is the anchor point of the normal service, and the UPF1 completes the handover procedure of the subsequent normal service. After receiving the handover request, the core network device triggers bearer release messages for other UPFs and feeds back a failure cause value, where the cause value may be marked as temporarily unreachable by the network, and the UE may perform detection attempt again in the next period; since multiple temporary UPF detections require a period of time during which service handoff requests, i.e., traffic from one RAN to another RAN, may be encountered before a new UPF handoff is completed, this section describes a fault tolerant approach; to ensure service continuity, temporary channels of other UPFs need to be disconnected, so that normal switching between the service channels UPF and the RAN is ensured.

Optionally, determining, according to the service type, that the service transfer point satisfying the preset condition exists in the service transfer point list includes:

acquiring packet loss rate and data transmission delay of data transmitted between UE and a service transfer point in a current delay test period;

determining a jitter value according to the data transmission delay; wherein the jitter value is equal to D _t-1 -D _t ，D _t-1 Representing the data transmission delay of data transmitted between the UE and the service switching point in the last delay test period, D _t Representing a data transmission delay for transmitting data between the current delay test period UE and the service switching point;

determining service transfer points meeting preset conditions in a service transfer point list according to the jitter value, the service type, the data transmission delay and the packet loss rate; the preset conditions comprise that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the jitter value is smaller than or equal to a jitter threshold;

or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in a service transfer point list according to the service type, the data transmission delay and the packet loss rate; the preset condition comprises that the data transmission time delay is smaller than or equal to a time delay threshold value, the packet loss rate is smaller than or equal to the packet loss threshold value, and the data transmission time delay for transmitting data between the UE and the service transfer point in the last time delay test period is larger than or equal to the data transmission time delay for transmitting data between the UE and the service transfer point in the current time delay test period;

Or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in a service transfer point list according to the service type and the data transmission delay; the preset condition comprises that the data transmission time delay is smaller than or equal to a time delay threshold value, and the data transmission time delay for transmitting data between the last time delay test period UE and the service transfer point is larger than or equal to the data transmission time delay for transmitting data between the current time delay test period UE and the service transfer point;

or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in a service transfer point list according to the jitter value, the service type, the data transmission delay and the packet loss rate; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to the packet loss threshold, the jitter value is smaller than or equal to the jitter threshold, and the data transmission delay of data transmission between the last delay test period UE and the service transfer point is larger than or equal to the data transmission delay of data transmission between the current delay test period UE and the service transfer point.

Specifically, the core network device may further determine, according to the service type, the data transmission delay and the jitter value, a service switching point in the service switching point list, where the service switching point meets a preset condition; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold value, and the jitter value is smaller than or equal to the jitter threshold value.

Or alternatively, the process may be performed,

the core network device can also determine service transfer points meeting preset conditions in the service transfer point list according to the service type, the data transmission delay and the jitter value; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold value, the jitter value is smaller than or equal to the jitter threshold value, and the data transmission delay for transmitting data between the last delay test period UE and the service transfer point is larger than or equal to the data transmission delay for transmitting data between the current delay test period UE and the service transfer point.

Or alternatively, the process may be performed,

the core network equipment determines service transfer points meeting preset conditions in a service transfer point list according to the service type, the data transmission delay and the packet loss rate; the preset conditions include that the data transmission delay is smaller than or equal to a delay threshold value, and the packet loss rate is smaller than or equal to a packet loss threshold value.

Or alternatively, the process may be performed,

the core network equipment determines service transfer points meeting preset conditions in a service transfer point list according to the service type and the data transmission delay; the preset condition comprises that the data transmission delay is smaller than or equal to a delay threshold value.

Specifically, when the service type of the UE is multimedia service, the data transmission delay and the jitter value are important, and the core network device selects to measure the data transmission delay and the jitter value as the main factors; for example, when the UE is currently connected to UPF1 via the RAN, the UPF adjacent to UPF1 includes UPF2 and UPF3, and the core network device may determine 6 data transmission delays (UE-to-UPF 1, UE-to-UPF 2, and UE-to-UPF 3 data transmission delays) for UPF1, UPF2, and UPF3, respectively, during the current delay test period,

The data transmission delay of UPF1 is: [50ms,40ms,55 ms,20ms ];

the data transmission delay of UPF2 is: [70ms,60ms,50ms,40ms,30ms,20ms ];

the data transmission delay of UPF3 is: [45ms,44ms,45ms,44ms ].

As can be seen from the above-mentioned data,

the jitter value data of UPF1 is: [ ji1=10, ji2= -10, ji3=10, ji4= -5, ji5=30 ];

the jitter value data of UPF2 are: [ ji1=10, ji2=10, ji3=10, ji4=10, ji5=10 ];

the jitter value data of UPF3 are: [ Ji1=1, ji2= -1, ji3=1, ji4= -1, ji5=1 ].

Assuming that the corresponding delay threshold of the multimedia service is 50ms and the jitter threshold is 5, at the moment, the core network equipment determines that UPF3 meets the requirements of the multimedia service on the data transmission delay and the jitter value; therefore, the core network device determines a first total data transmission delay of the UE transmitted to the UPF1 through the UE and a second total data transmission delay of the UE transmitted to the UPF3 according to the data transmission delay data from the UE to the UPF1 and the data transmission delay data from the UE to the UPF3, and when the second total data transmission delay is smaller than the first total data transmission delay, the core network device needs to release the transmission channels of the UE and the UPF1, and reestablishes the transmission channels of the UE and the UPF 3; when the second total data transmission delay is greater than the first total data transmission delay, the core network device does not make any change.

Specifically, when the service type of the UE is a control instruction, the packet loss rate and the data transmission delay are important, and the core network device selects to measure the data transmission delay and the packet loss rate as the main factors; for example, when the UE is currently connected to UPF1 via the RAN, the UPF adjacent to UPF1 includes UPF2 and UPF3, and the core network device may determine 6 data transmission delays (UE-to-UPF 1, UE-to-UPF 2, and UE-to-UPF 3 data transmission delays) for UPF1, UPF2, and UPF3, respectively, during the current delay test period,

the data transmission delay of UPF1 is: [50ms,40ms,55 ms,20ms ];

the data transmission delay of UPF2 is: [70ms,60ms,50ms,40ms,30ms,20ms ];

the data transmission delay of UPF3 is: [45ms,44ms,45ms,44ms ];

the packet loss rate of UPF1 is 5%; the packet loss rate of UPF2 is 4%; the packet loss rate of UPF3 is 2%.

Assuming that the time delay threshold corresponding to the control instruction is 50ms and the packet loss threshold is 3%, at the moment, the core network equipment determines that UPF3 meets the requirements of the multimedia service on the data transmission time delay and the packet loss rate; therefore, the core network device determines a first total data transmission delay from the UE to the UPF1 and a second total data transmission delay from the UE to the UPF3 according to the data transmission delay data from the UE to the UPF1 and the data transmission delay data from the UE to the UPF3, and when the second total data transmission delay is smaller than the first total data transmission delay, the core network device needs to release the transmission channel passing through the UE and the UPF1, and reestablishes the transmission channel between the UE and the UPF 3; when the second total data transmission delay is greater than the first total data transmission delay, the core network device does not make any change.

In particular, when the service type of the UE is a low latency service, recursion (meaning that the data transmission delay of the data transmitted between the UE and the service transfer point in the last latency test period is greater than or equal to the data transmission delay of the data transmitted to the service transfer point by the server in the current latency test period) and the data transmission delay are important, the core network device selects to determine the data transmission delay and recursion, for example, when the UE currently establishes a connection with the UPF1 through the RAN, the UPF adjacent to the UPF1 includes the UPF2 and the UPF3, and at this time, the core network device may determine 6 data transmission delays (UE to UPF1, UE to UPF2, and UE to UPF 3) for the UPF1, UPF2, and UPF3, respectively, in the current latency test period,

the data transmission delay of UPF1 is: [50ms,40ms,55 ms,20ms ];

the data transmission delay of UPF2 is: [49ms,45ms,44ms,40ms,30ms,20ms ];

the data transmission delay of UPF3 is: 70ms,66ms,67ms,55ms,45ms,60 ms.

When the time delay threshold corresponding to the low-time delay service is assumed to be 50ms and the data transmission time delay of the UPF is required to have recursion, the core network equipment determines that only UPF2 meets the requirements of the multimedia service on the data transmission time delay and the recursion; therefore, the core network device determines a first total data transmission delay from the UE to the UPF1 and a second total data transmission delay from the UE to the UPF2 according to the data transmission delay data from the UE to the UPF1 and the data transmission delay data from the UE to the UPF2, and when the second total data transmission delay is smaller than the first total data transmission delay, the core network device needs to release the transmission channels of the UE and the UPF1 and reestablish the transmission channels of the UE and the UPF 2; when the second total data transmission delay is greater than the first total data transmission delay, the core network device does not make any change.

Optionally, the method further includes, as shown in fig. 5:

s106, acquiring longitude coordinates, latitude coordinates and moving speed of the UE.

S107, determining a resident area where the UE is currently located according to the longitude coordinate and the latitude coordinate; wherein the resident area comprises a construction urban area or a construction suburban area.

S108, determining a deployment distance according to the residence area; wherein the deployment distance is used to indicate the distance between service switching points in different residence areas.

When needing to be described, the deployment distance refers to the distance between the service transfer point and the adjacent service transfer point when the service transfer point is newly built in each residence area; as shown in fig. 6, the adjacent UPFs of the illustrated UPF1 include UPF2, UPF3, UPF4, and UPF5; whereas the adjacent UPFs of UPF2 include UPF1, UPF3, and UPF5; thus, when UPF1, UPF2, UPF3, UPF4, and UPF5 are located within the same residence area, the deployment distance between UPF1 and UPF2, the deployment distance between UPF1 and UPF3, the deployment distance between UPF1 and UPF4, and the deployment distance between UPF1 and UPF5 are all the same.

S109, determining a time delay test period according to the deployment distance and the moving speed.

In practical application, the core network device supports caching and storing all the report messages obtained through the API.

Specifically, longitude coordinates, latitude coordinates, moving speed and the like of the UE may be sent to the core network device through the application layer; the longitude coordinates, latitude coordinates, moving speed, and the like of the UE are transmitted to the core network device by way of app, for example.

Specifically, the core network device may calculate a time delay test period T through the movement speed of the UE obtained from the application layer, for example, the movement speed of the UE is 15km/h, and then the core network device can move about 10km after 0.6 h; when the UE moves for 10m, in order to ensure that the data transmission delay of the transmission channel between the UE and the core network device is the lowest, it is necessary to determine whether to switch the UPF, so as to ensure the user experience in real time; the core network equipment pre-configures the deployment distances of UPFs corresponding to different residence areas; for example, when the deployment distance L of the urban area is 10km, the deployment distance L of the suburban area is 20km, and the moving speed of the UE is 15km/h according to the moving distance of the UE at the current time and the last time, the time delay test period is

When the UE is located in suburb, the delay test period is +.>

Example two

An embodiment of the present invention provides a core network device 10, as shown in fig. 7, including:

a receiving unit 101, configured to receive a bearer establishment request sent by a UE; the bearer establishment request is used for indicating the core network equipment to establish a transmission channel between the UE and the service transfer point.

An acquiring unit 102, configured to acquire a service type and a service transfer point list of the UE; wherein the service switching point list comprises at least one service switching point capable of establishing a bearer.

The processing unit 103 is configured to determine, according to the bearer establishment request received by the receiving unit 101, a service transfer point in the service transfer point list that satisfies a preset condition according to a service type after establishing a temporary channel between the UE and any service transfer point in the service transfer point list acquired by the acquiring unit 102 when it is determined that a UPF control plane negotiation is not required before a transmission channel is established.

The processing unit 103 is further configured to release the temporary channel and re-establish the transmission channel between the UE and the service transfer point that satisfies the preset condition when the service transfer point corresponding to the temporary channel is different from the service transfer point that satisfies the preset condition; wherein, the data transmission delay of the transmission channel is the lowest.

Optionally, the processing unit 103 is further configured to determine, according to the bearer establishment request received by the receiving unit 101, a service transfer point meeting a preset condition in the service transfer point list acquired by the acquiring unit 102 according to the service type acquired by the acquiring unit 102 when the UPF control plane negotiation is required before the transmission channel is established, and establish a transmission channel between the UE and the service transfer point meeting the preset condition.

Optionally, the acquiring unit 102 is specifically configured to acquire a packet loss rate of data sent between the UE and the service switching point in the current delay test period and a data transmission delay.

A processing unit 103, specifically configured to determine a jitter value according to the data transmission delay acquired by the acquiring unit 102; wherein the jitter value is equal to D _t-1 -D _t ，D _t-1 Representing the data transmission delay of data transmitted between the UE and the service switching point in the last delay test period, D _t Representing the data transmission delay for transmitting data between the current delay test period UE and the service switching point.

The processing unit 103 is specifically configured to determine a service switching point in the service switching point list that meets a preset condition according to the jitter value acquired by the acquiring unit 102, the service type acquired by the acquiring unit 102, the data transmission delay acquired by the acquiring unit 102, and the packet loss rate acquired by the acquiring unit 102; the preset conditions include that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the jitter value is smaller than or equal to a jitter threshold.

Or alternatively, the process may be performed,

the processing unit 103 is specifically configured to determine a service switching point in the service switching point list that meets a preset condition according to the service type acquired by the acquiring unit 102, the data transmission delay acquired by the acquiring unit 102, and the packet loss rate acquired by the acquiring unit 102; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to the packet loss threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period.

Or alternatively, the process may be performed,

a processing unit 103, configured to determine, according to the service type acquired by the acquiring unit 102 and the data transmission delay acquired by the acquiring unit 102, a service switching point in the service switching point list that meets a preset condition; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold value, and the data transmission delay for transmitting data between the last delay test period UE and the service transfer point is larger than or equal to the data transmission delay for transmitting data between the current delay test period UE and the service transfer point.

Or alternatively, the process may be performed,

the processing unit 103 is specifically configured to determine a service switching point in the service switching point list that meets a preset condition according to the jitter value acquired by the acquiring unit 102, the service type acquired by the acquiring unit 102, the data transmission delay acquired by the acquiring unit 102, and the packet loss rate acquired by the acquiring unit 102; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to the packet loss threshold, the jitter value is smaller than or equal to the jitter threshold, and the data transmission delay of data transmission between the last delay test period UE and the service transfer point is larger than or equal to the data transmission delay of data transmission between the current delay test period UE and the service transfer point.

Optionally, the acquiring unit 102 is further configured to acquire a longitude coordinate, a latitude coordinate, and a moving speed of the UE.

The processing unit 103 is further configured to determine a residence area where the UE is currently located according to the longitude coordinate acquired by the acquiring unit 102 and the latitude coordinate acquired by the acquiring unit 102; wherein the resident area comprises a construction urban area or a construction suburban area.

A processing unit 103, configured to determine a deployment distance according to the residence area; wherein the deployment distance is used to indicate the distance between service switching points in different residence areas.

The processing unit 103 is further configured to determine a time delay test period according to the deployment distance and the movement speed acquired by the acquiring unit 102.

All relevant contents of each step related to the above method embodiment may be cited to the functional descriptions of the corresponding functional modules, and their effects are not described herein.

The core network device 10 in the case of an integrated module comprises: the device comprises a storage unit, a processing unit receiving unit and an acquisition unit. The processing unit is configured to control and manage actions of the core network device, for example, the processing unit is configured to support the core network device to perform the procedures S101, S102, S103, and S104 in fig. 3; the receiving unit and the acquiring unit are both used for supporting information interaction between the core network equipment and other equipment. And the storage unit is used for storing the program codes and data of the core network equipment.

The processing unit is taken as a processor, the storage unit is a memory, and the receiving unit and the obtaining unit are both communication interfaces. The core network device is shown in fig. 8, and includes a communication interface 501, a processor 502, a memory 503, and a bus 504, where the communication interface 501 and the processor 502 are connected to the memory 503 through the bus 504.

The processor 502 may be a general purpose central processing unit (collectively referred to as Central Processing Unit, CPU), microprocessor, application-specific integrated circuit (collectively referred to as Application-Specific Integrated Circuit, ASIC), or one or more integrated circuits for controlling program execution in accordance with aspects of the present Application.

The Memory 503 may be, but is not limited to, a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a random access Memory (RANdom Access Memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a Read-Only optical disk (Compact Disc Read-Only Memory, CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be stand alone and coupled to the processor via a bus. The memory may also be integrated with the processor.

The memory 503 is used for storing application codes for executing the present application, and is controlled by the processor 502 to execute the present application. The communication interface 501 is used for information interaction with other devices, such as a remote control. The processor 502 is configured to execute application code stored in the memory 503, thereby implementing the methods described in the embodiments of the present application.

Further, a computing storage medium (or media) is provided that includes instructions that when executed perform the method operations performed by the core network device in the above embodiments. In addition, a computer program product is provided, comprising the above computing storage medium (or media).

It should be understood that, in various embodiments of the present invention, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or units, electrical, mechanical, or other form.

The units described as separate units may or may not be physically separate, and units shown 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random access memory (RANdom access memory, RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

It can be appreciated that any of the core network devices provided above is used for executing the method corresponding to the first embodiment provided above, so that the advantages achieved by the core network device can refer to the method corresponding to the first embodiment and the advantages of the corresponding scheme in the following detailed description, which are not repeated herein.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A data transmission method, comprising:

receiving a bearer establishment request sent by UE; the bearer establishment request is used for indicating the core network equipment to establish a transmission channel between the UE and the service transfer point;

acquiring a service type and a service transfer point list of the UE; wherein the service transfer point list comprises at least one service transfer point capable of establishing a bearer;

determining a service transfer point meeting a preset condition in the service transfer point list according to the service type after establishing a temporary channel between the UE and any service transfer point in the service transfer point list when the UPF control plane negotiation is not required before establishing the transmission channel according to the bearer establishment request;

Releasing the temporary channel when the service transfer point corresponding to the temporary channel is different from the service transfer point meeting the preset condition, and reestablishing the transmission channel between the UE and the service transfer point meeting the preset condition; wherein, the data transmission delay of the transmission channel is the lowest;

wherein, the determining that the UPF control plane negotiation is not required before the transmission channel is established includes:

when the type of the requested service is a low-delay service, it is determined that UPF control plane negotiation is not required, and the low-delay service is a service with a delay less than or equal to a delay threshold.

2. The data transmission method according to claim 1, characterized in that the method further comprises:

and when the UPF control plane negotiation is required before the transmission channel is established according to the bearer establishment request, determining a service transfer point meeting a preset condition in the service transfer point list according to the service type, and establishing the transmission channel between the UE and the service transfer point meeting the preset condition.

3. The data transmission method according to claim 1 or 2, wherein determining, according to the service type, that a service switching point satisfying a preset condition exists in the service switching point list includes:

Acquiring packet loss rate and data transmission delay of data transmitted between the UE and the service transfer point in a current delay test period;

determining a jitter value according to the data transmission delay; wherein the jitter value is equal to D _t-1 -D _t ，D _t-1 Representing a data transmission delay of data transmitted between said UE and said service switching point in a last delay test period, D _t Representing a data transmission delay for transmitting data between the UE and the service switching point in a current delay test period;

determining service transfer points meeting preset conditions in the service transfer point list according to the jitter value, the service type, the data transmission delay and the packet loss rate; the preset conditions include that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the jitter value is smaller than or equal to a jitter threshold;

or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in the service transfer point list according to the service type, the data transmission delay and the packet loss rate; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period;

Or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in the service transfer point list according to the service type and the data transmission delay; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period;

or alternatively, the process may be performed,

determining service transfer points meeting preset conditions in the service transfer point list according to the jitter value, the service type, the data transmission delay and the packet loss rate; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, the jitter value is smaller than or equal to a jitter threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period.

4. A data transmission method according to claim 3, characterized in that the method further comprises:

Acquiring longitude coordinates, latitude coordinates and moving speed of the UE;

determining a resident area where the UE is currently located according to the longitude coordinate and the latitude coordinate; wherein the residence area comprises a construction urban area or suburban area;

determining a deployment distance according to the residence area; the deployment distance is used for indicating the distance between service transfer points in different residence areas;

and determining the time delay test period according to the deployment distance and the moving speed.

5. A core network device, comprising:

a receiving unit, configured to receive a bearer establishment request sent by a UE; the bearer establishment request is used for indicating the core network equipment to establish a transmission channel between the UE and the service transfer point;

an acquiring unit, configured to acquire a service type and a service transfer point list of the UE; wherein the service transfer point list comprises at least one service transfer point capable of establishing a bearer;

the processing unit is used for determining a service transfer point meeting a preset condition in the service transfer point list according to the service type after establishing a temporary channel between the UE and any service transfer point in the service transfer point list acquired by the acquisition unit when determining that UPF control plane negotiation is not needed before establishing the transmission channel according to the bearer establishment request received by the receiving unit;

The processing unit is further configured to release the temporary channel and reestablish a transmission channel between the UE and the service transfer point that satisfies the preset condition when the service transfer point corresponding to the temporary channel is determined to be different from the service transfer point that satisfies the preset condition; wherein, the data transmission delay of the transmission channel is the lowest;

6. The core network device according to claim 5, wherein the processing unit is further configured to determine, according to the service type acquired by the acquiring unit when determining that the UPF control plane negotiation is required before the establishment of the transmission channel according to the bearer establishment request received by the receiving unit, a service transfer point satisfying a preset condition in the service transfer point list acquired by the acquiring unit, and establish a transmission channel between the UE and the service transfer point satisfying the preset condition.

7. The core network device according to claim 5 or 6, wherein the obtaining unit is specifically configured to obtain a packet loss rate of data transmitted between the UE and the service switching point in a current delay test period and a data transmission delay;

the processing unit is specifically configured to determine a jitter value according to the data transmission delay acquired by the acquiring unit; wherein the jitter value is equal to D _t-1 -D _t ，D _t-1 Indicating the UE and the service transfer in the last delay test periodData transmission delay of transmitting data between points D _t Representing a data transmission delay for transmitting data between the UE and the service switching point in a current delay test period;

the processing unit is specifically configured to determine a service switching point in the service switching point list, where the service switching point meets a preset condition, according to the jitter value acquired by the acquiring unit, the service type acquired by the acquiring unit, the data transmission delay acquired by the acquiring unit, and the packet loss rate acquired by the acquiring unit; the preset conditions include that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the jitter value is smaller than or equal to a jitter threshold;

Or alternatively, the process may be performed,

the processing unit is specifically configured to determine a service transfer point in the service transfer point list that meets a preset condition according to the service type acquired by the acquiring unit, the data transmission delay acquired by the acquiring unit, and the packet loss rate acquired by the acquiring unit; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period;

or alternatively, the process may be performed,

the processing unit is specifically configured to determine, according to the service type acquired by the acquiring unit and the data transmission delay acquired by the acquiring unit, a service switching point in the service switching point list that meets a preset condition; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period;

Or alternatively, the process may be performed,

the processing unit is specifically configured to determine a service switching point in the service switching point list, where the service switching point meets a preset condition, according to the jitter value acquired by the acquiring unit, the service type acquired by the acquiring unit, the data transmission delay acquired by the acquiring unit, and the packet loss rate acquired by the acquiring unit; the preset condition includes that the data transmission delay is smaller than or equal to a delay threshold, the packet loss rate is smaller than or equal to a packet loss threshold, the jitter value is smaller than or equal to a jitter threshold, and the data transmission delay of data transmitted between the UE and the service transfer point in the last delay test period is larger than or equal to the data transmission delay of data transmitted between the UE and the service transfer point in the current delay test period.

8. The core network device according to claim 7, wherein the acquiring unit is further configured to acquire longitude coordinates, latitude coordinates, and a moving speed of the UE;

the processing unit is further configured to determine a residence area where the UE is currently located according to the longitude coordinate acquired by the acquiring unit and the latitude coordinate acquired by the acquiring unit; wherein the residence area comprises a construction urban area or suburban area;

The processing unit is further used for determining a deployment distance according to the residence area; the deployment distance is used for indicating the distance between service transfer points in different residence areas;

the processing unit is further configured to determine the time delay test period according to the deployment distance and the movement speed acquired by the acquiring unit.

9. A computer storage medium comprising instructions which, when run on a computer, cause the computer to perform the data transmission method according to any of the preceding claims 1-4.

10. A core network device, comprising: communication interface, processor, memory, bus; the memory is used for storing computer-executable instructions, and the processor is connected with the memory through a bus, and when the core network device runs, the processor executes the computer-executable instructions stored in the memory, so that the core network device executes the data transmission method as claimed in any one of claims 1-4.