CN112583880B - Server discovery method and related equipment - Google Patents

Server discovery method and related equipment Download PDF

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Publication number
CN112583880B
CN112583880B CN201910945606.5A CN201910945606A CN112583880B CN 112583880 B CN112583880 B CN 112583880B CN 201910945606 A CN201910945606 A CN 201910945606A CN 112583880 B CN112583880 B CN 112583880B
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application layer
layer server
terminal
service range
address
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CN112583880A (en
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王胡成
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H04L63/107—Network architectures or network communication protocols for network security for controlling access to devices or network resources wherein the security policies are location-dependent, e.g. entities privileges depend on current location or allowing specific operations only from locally connected terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management

Abstract

The application provides a server discovery method and related equipment, which are used for improving the flexibility of server discovery. The method comprises the following steps: acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server; if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.

Description

Server discovery method and related equipment
Technical Field
The present application relates to the field of communications technologies, and in particular, to a server discovery method and a related device.
Background
The European Telecommunications Standardization Institute (ETSI) proposed the concept of Mobile Edge Computing (MEC), which is to sink computing power to distributed base stations, providing near-cloud computing, storage, and processing capabilities at the edge of a mobile network. In the fifth generation (5) supporting Mobile Edging Computing (MEC)thgeneration, 5G) communication network, the terminal device may obtain the MEC application service through the MEC server. Before the terminal equipment obtains the MEC application service, the terminal equipment needs to discover the address of the MEC server。
Currently, the edge computing server is discovered by querying and obtaining the address of the server according to a Domain Name System (DNS) mechanism of an application layer. Generally, according to a DNS mechanism query mode, the deployment requirement of an application layer is high, or the requirement of a User Plane Function (UPF) is high, which results in a difficulty in later service deployment.
Disclosure of Invention
The embodiment of the application provides a server discovery method and related equipment, which are used for improving the flexibility of server discovery.
In a first aspect, a server discovery method is provided, which is applied to a terminal, and the method includes:
acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
In a possible embodiment, the obtaining terminal policy information from a core network element entity includes:
acquiring terminal strategy information from a core network element entity;
and the terminal policy information is generated by the core network element entity according to the address of the application layer server sent by the application layer server and the service range of the application layer server.
In a possible embodiment, before accessing the application layer server according to the application layer server address in the terminal policy information, the method includes:
if the PDU session for accessing the application layer server is established, determining whether the terminal meets the access condition of the address of the application layer server according to the terminal strategy information; alternatively, the first and second electrodes may be,
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information; alternatively, the first and second electrodes may be,
if first indication information sent by a core network element entity is received, determining whether the terminal meets the access condition of the application layer server address according to the terminal strategy information; wherein the first indication information is used for indicating the change of the service scope of the PDU session currently used for accessing the application layer server.
In a possible embodiment, before determining whether the terminal satisfies the access condition of the address of the application layer server according to the terminal policy information if it is determined to move out of the service scope of the PDU session currently used for accessing the application layer server or the service scope of the currently accessed application layer server, the method includes:
determining that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server or determining that the terminal moves out of the service range of the current application layer server according to second indication information sent by a network element entity of a core network;
the second indication information is used for indicating that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server, or determining that the terminal moves out of the service range of the current application layer server.
In a possible embodiment, before determining whether the terminal satisfies the access condition of the application layer server address according to the terminal policy information if the first indication information is received, the method includes:
receiving first indication information from a core network element entity serving a current PDU session;
wherein the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point currently used for accessing the PDU session of the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In a possible embodiment, before accessing the application layer server according to the application layer server address in the terminal policy information if it is determined that the terminal satisfies the access condition of the application layer server address, the method includes:
when the service range of the server comprises a tracking area TA list, if the tracking area where the terminal is located is determined to be located in the TA list, determining that the terminal meets the access condition of the address of the application layer server; alternatively, the first and second electrodes may be,
when the service range of the application layer server comprises a data network access list DNAI, if the DNAI in the service range of the application layer server and the DNAI associated with the first PDU session are determined to have intersection, determining that the terminal meets the access condition of the address of the application layer server; and the first PDU session is a PDU session which is established by the terminal and used for accessing the application layer service.
In one possible embodiment, before determining that the terminal satisfies the access condition of the application layer server address if it is determined that there is an intersection between the DNAI and a DNAI associated with a PDU session currently serving the terminal, the method includes:
in establishing or modifying a PDU session, a DNAI associated with a first PDU session is received from an SMF entity serving the current PDU session.
In a possible embodiment, the application layer server is a local domain name system DNS server or an application server, and if the application layer server is a DNS server, after accessing the application layer server, the method includes:
inquiring the DNS server to obtain an application server address;
and accessing the application server according to the address of the application server obtained by inquiry.
In one possible embodiment, the application server comprises an edge computing enabled server, or an edge computing application server.
In a second aspect, a server discovery method is provided, which is applied in a core network element entity, and the method includes:
generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
and sending the terminal strategy information to a terminal.
In a possible embodiment, after sending the terminal policy information to the terminal, the method further includes:
if the terminal is determined to move out of the service range of the current PDU session anchor point, inserting the service range corresponding to the PDU session anchor point or changing the service range corresponding to the extra PDU session anchor point;
generating first indication information and sending the first indication information to the terminal; wherein the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point currently used for accessing the PDU session of the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In a possible embodiment, after sending the terminal policy information to the terminal, the method further includes:
if the terminal is determined to move out of the service range of the PDU session currently used for accessing the application layer server or the terminal is determined to move out of the service range of the current application layer server, generating second indication information and sending the second indication information to the terminal;
the second indication information is used for indicating that the terminal moves out of a service range of a PDU session currently used for accessing the application layer server, or the terminal moves out of the service range of the current application layer server.
In a third aspect, a terminal is provided, including: a processor, a memory, and a transceiver;
a processor for reading the program in the memory and performing the following processes:
acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
In a fourth aspect, there is provided a core network element entity, including: a processor, a memory, and a transceiver;
a processor for reading the program in the memory and performing the following processes:
generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
and sending the terminal strategy information to a terminal.
In a fifth aspect, a terminal is provided, including:
a transceiver module: the terminal strategy information acquisition module is used for acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server;
the processing module is used for accessing the application layer server according to the application layer server address in the terminal strategy information if the terminal is determined to meet the access condition of the application layer server address; the terminal meets the access condition of the address of the application layer server, and the terminal is located in the service range of the application layer server.
In a sixth aspect, there is provided a core network element entity, including:
a processing module: the terminal strategy information generating device is used for generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
and the receiving and sending module is used for sending the terminal strategy information to the terminal.
In a seventh aspect, a computer-readable storage medium is provided, which stores computer instructions that, when executed on a computer, cause the computer to perform the method of any one of the first and second aspects
Due to the adoption of the technical scheme, the embodiment of the application has at least the following technical effects:
in the embodiment of the application, the policy information is directly issued through the core network element entity, and the terminal accesses the application layer server according to the policy information without deploying a large number of devices on the application layer, so that the flexibility of accessing the application layer server is improved.
Drawings
Fig. 1 is a schematic view of an application scenario of a server discovery method according to an embodiment of the present application;
fig. 2 is an interaction diagram of a server discovery method according to an embodiment of the present application;
fig. 3 is a schematic diagram of a process of generating policy information according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a method for determining whether a UE needs to change an address of an application layer server according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a network element entity of a core network according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a network element entity of a core network according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions provided by the embodiments of the present application, the following detailed description is made with reference to the drawings and specific embodiments.
For ease of understanding, the following description will refer to terms of art to which embodiments of the present application relate.
A terminal: also known as terminal equipment, User Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), etc., is a device that provides voice and/or data connectivity to a user, e.g., a handheld device with wireless connection capability, a vehicle-mounted device, etc. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), and the like.
Core network element entity: refers to an entity device that implements a function corresponding to a network element of a core network.
The following describes application scenarios related to embodiments of the present application.
Referring to fig. 1, an application scenario diagram, which can also be understood as an edge computing network architecture, is shown, where the application scenario includes: core network elements and MECs. The functions of the respective blocks in fig. 1 are explained below.
Access and Mobility Management Function (AMF): used for registration, connection management and other functions.
User plane Function (User Plan Function, UPF): external PDU session nodes for interconnection to a data network, message routing and forwarding.
Session Management Function (SMF): the method is used for session establishment and deletion, user plane selection and control, UE IP allocation and the like.
Network storage Function (NRF): for supporting service discovery functions.
Unified Data Management (UDM): for storing information of the UE, such as subscription information, information that a PDU session has been established.
The Mobile Edge Computing (MEC) technology migrates the Computing storage capacity and the business service capacity to the network edge, so that data does not need to be transmitted back to the cloud as much as possible, and the waiting time of the data to and from the cloud and the network cost are reduced. Based on the fifth generation (5)thgeneration, 5G), a 5G user plane and 5G MEC nodes are established in edge clouding, and the 5G MEC nodes provide an MEC application platform to realize the deployment and management capability of third-party applications. A user may obtain services through the MEC application.
The following is directed to the embodiments of the present application based on the application scenario discussed in FIG. 1The related service discovery method is introduced. The embodiment of the application can be applied to, but is not limited to, a fifth generation new air interface (5)thThe new radio, 5G NR) system may also be applied to an LTE system, a long term evolution-advanced (LTE-a) system, an enhanced long term evolution-advanced (LTE-a) system, and other communication systems, and may also be subsequently extended to related cellular systems such as wireless fidelity (WiFi), worldwide interoperability for microwave access (wimax), future wireless communication systems, and 3 GPP.
Referring to fig. 2, the server discovery method includes:
s201, a core network element entity generates strategy information;
s202, the core network element sends the strategy information to the terminal;
s203, the terminal accesses the application layer server according to the application layer server address in the strategy information.
In the embodiment of the application, the policy information is directly issued through the core network element entity, and the terminal accesses the application layer server according to the policy information without deploying a large number of devices on the application layer, so that the flexibility of accessing the application layer server is improved.
The following describes the steps in the embodiments of the present application.
In S201: the core network element entity can generate terminal strategy information according to the application layer server address sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, and the access condition of the application layer server address comprises a service range of the application layer server.
Specifically, referring to fig. 3, after the Application layer deploys the EC service, the Application Function (AF) executes S301, and invokes the nfransfficinfluence service to notify the 3GPP core network element (e.g., NEF in fig. 3) of the Application layer information.
The application layer information comprises an application layer server address and a service range of the application layer server. In addition, the Application layer Information may further include Application description Information, where the Application description Information may be one or a combination of Network Slice Selection Assistance Information (S-NSSAI), a Data Network Name (DNN), and an Application identification ID. The application layer server is a local domain name system DNS server or an application server, and when the application layer server is the local domain name system DNS server, the service range of the application layer server may be a DNAI list. When the application layer server is an application server, the service range of the application layer server may be a service Area represented by a Tracking Area (TA).
S302, NEF updates application layer information to UDT, and the Unified Database (UDR) stores the information in application Data (application Data).
S303, NEF notifies PCF of the update of application data.
Specifically, the NEF may send an update response of the application data to the Nnef _ trafficinfiffice service.
S304, the UDR notifies the PCF of the application layer information through the nurr _ DM _ Notify.
S305, PCF generates terminal strategy information (UE policy) according to the application layer information and the current position of the UE.
Specifically, the PCF may generate a rule descriptor (traffic descriptor) according to the application layer description information, and generate the terminal policy information according to the address of the application layer server and the service range.
For example, PCF edge computing/application service area or local DNS service area information generates local criteria (location criterion), specifically, for example, a TAI list to which DNAI is mapped, and PCF may also save an edge computing/application server address or a local DNS server address as a new entry.
Referring to table 1, table 1 shows an example of storing the generated UE Policy in a terminal routing rule (URSP rule).
TABLE 1
Figure BDA0002224040470000101
As an example, only one of (A), (B) and (C) in Table 1 may be present. (A) When either (B) or (C) occurs, Location criterion must occur.
As another example, the PCF may send the DNAI list to the terminal as a location condition. The terminal policy information as shown in table 2 below.
TABLE 2
Figure BDA0002224040470000111
As an example, only one of (a), (B), and (C) in table 1 in table 2 may be present. (A) When either (B) or (C) is present, DNAI match criterion must be present.
The contents of table 1 can be referred to for each english translation in table 2, and the details are not repeated here.
After the PCF generates the terminal policy information, the PCF sends the terminal policy information to the terminal, and the terminal executes S303 and accesses the application layer server according to the policy information.
Specifically, before accessing the application server, the terminal device needs to determine whether itself meets the access condition of the application layer server address, and the specific conditions for triggering the terminal to determine include, but are not limited to, the following:
the first condition is as follows: and if the PDU session for accessing the application layer server is established, determining whether the terminal meets the access condition of the address of the application layer server according to the terminal strategy information.
Case two: if the terminal is determined to move out of the service range of the PDU session currently used for accessing the application layer server or the service range of the currently accessed application layer server, determining whether the terminal meets the access condition of the address of the application layer server according to the terminal strategy information; alternatively, the first and second electrodes may be,
case three: if first indication information sent by a core network element entity is received, determining whether a terminal meets an access condition of an application layer server address according to terminal strategy information; wherein the first indication information is used for indicating the service range change of the PDU session currently used for accessing the application layer server.
The above-described cases will be specifically described below.
For case one:
after receiving the UE policy updated by the PCF, if an application needs to initiate a service, the UE needs to perform PDU session (PDU session) association according to the UE policy, and if there is no associated PDU session, the UE needs to establish a new PDU session.
For case two:
determining to move out of a service range of the PDU session currently used for accessing the application layer server or determining to move out of the service range of the current application layer server according to second indication information sent by a core network element entity;
the second indication information is used for indicating that the terminal moves out of a service range of a PDU session currently used for accessing the application layer server, or indicating that the terminal moves out of the service range of the current application layer server.
For case three:
receiving first indication information from a core network element entity;
wherein the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point currently used for accessing the PDU session of the application layer server or a service range corresponding to a changed extra PDU session anchor point.
Next, the specific implementation process of the second case and the third case will be described with reference to fig. 4.
S401, the SMF judges that the terminal moves out of the service area of the current anchor point UPF according to the UE position.
Specifically, the SMF determines that the UE will move out of the service area of the current Anchor UPF according to the UE position and the service area of the Anchor UPF (or the attached Anchor PDU Session Anchor) of the current PDU Session.
PDU session for SSC mode 3:
s402, SMF issues the second indication information.
Specifically, the SMF sends second indication information (for example, PDU Session modification command) to the UE, and instructs the UE to reestablish a PDU Session by using the same DNN.
S403, the terminal determines whether there is a matching URSP rule.
Specifically, when the PDU session is newly established, the UE finds the matched URSP rule and RSD rule according to the policy information of the terminal, and the UE avoids using the RSD rule associated with the established PDU session.
S404, a new PDU session is created.
Specifically, the UE establishes a new PDU session, and the SMF provides the UE with a DNAI list or service area corresponding to the new anchor UPF 2.
For PDU session using UL-CL or IPv6 multiple timing:
s405, the SMF inserts a new UL-CL or a modified additional PSA.
Specifically, the SMF sends first indication information (for example, a PDU Session modification command PDU) to the UE, and notifies the UE of a DNAI list or a service area corresponding to the changed additional PSA (anchor UPF 2).
S406, the SMF sends the first indication information to the terminal.
Specifically, the SMF is configured to indicate a service range corresponding to an inserted PDU session anchor currently used for accessing the PDU of the application layer server, or a service range corresponding to a changed additional PDU session anchor.
In any of the above cases, the terminal determines whether it satisfies the terminal policy information. A specific manner in which the terminal determines that the policy information is satisfied is explained as follows.
When the service range of the application layer server in the terminal policy information comprises a tracking area TA list, if the tracking area where the terminal is located is determined to be located in the TA list, determining that the terminal meets the access condition of the address of the application layer server; alternatively, the first and second electrodes may be,
when the service range of the application layer server comprises a data network access list DNAI, if the DNAI in the service range of the application layer server and the DNAI associated with the first PDU session are determined to have intersection, determining that the terminal meets the access condition of the address of the application layer server; the first PDU session is a PDU session which is established by the terminal and used for accessing the application layer service.
After the terminal determines that the terminal meets the access condition of the application layer server address, the terminal executes S203 and accesses the application layer server according to the application layer server address in the terminal policy information.
Specifically, when the application layer server is an application server, the application server address in the terminal policy information accesses the application server. An application server, such as an edge compute enabled server (EC server), or an edge compute application server (EC application server).
When the application layer server is a DNS server, the terminal accesses the DNS server to obtain the address of the application server, and then inquires the obtained address of the application server to access the application server.
After receiving the DNAI list, the UE uses the DNAI list to match the RSD, and then informs the application layer of the EC/application server address or DNS server address in the matched RSD. The UE may then establish communication with the EC/application server using the methods discussed previously.
In one embodiment, the terminals all submit the addresses of the application layer servers to the application layer of the terminals, so that the application layer of the terminals access the application layer servers by using the addresses of the application layer servers.
As a specific embodiment, after receiving the UE policy updated by the PCF, if an application needs to initiate a service, the UE needs to perform PDU session association according to the UE policy, and if there is no associated PDU session, the UE needs to establish a new PDU session.
If the UE needs to establish a PDU session, a Route Selection Descriptor (RSD) needs to be found according to Application descriptors, DNN and other information provided by the Application layer. If the RSD rule contains the EC/application server address and the Location criterion in the Route Selection validity criterion is satisfied (for example, the Location criterion is TAI list, and the current TA of the UE is satisfied in the list), the NAS layer of the UE feeds back the EC/application server address to the application layer. Then the UE directly uses the EC/application server address to access the EC/application server.
If the UE finds the matched established PDU session and the Location criterion in the Route Selection validity criterion is satisfied, the UE feeds back EC/application server address to the application layer.
Optionally, after the position of the UE after moving does not satisfy Location criterion, the UE searches for a new RSD rule, and after finding a new matching RSD rule, feeds back a new EC/application server address to the application layer.
As a specific embodiment, after finding the RSD rule, the UE feeds back the address of the DNS server to the application layer. The method for searching for the RSD rule may be the process of searching for the RSD rule in the foregoing embodiment, and details are not described here. After the terminal obtains the address of the DNS server, the application layer of the terminal initiates DNS query by using the DNS server address to obtain the address of the EC/application server.
For example, with continued reference to fig. 4, S407, the terminal acquires a new EC service address.
Specifically, the UE uses the received DNAI list or service area of anchor UPF as location criterion or DNAI information criterion, re-searches the RSD rule, and then feeds back the address of EC/application server or DNS server address in the RSD rule to the application layer. The UE finally obtains the address of EC/application server2 and communicates with EC/application server 2.
Based on the same inventive concept, an embodiment of the present application provides a terminal, please refer to fig. 5, which includes a processor 501, a memory 502 and a transceiver 503, wherein:
a processor 501 for reading the program in the memory 502 and executing the following processes:
acquiring terminal strategy information from a core network element entity; the terminal strategy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point of a PDU session of the service application layer server;
if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meets the access condition of the address of the application layer server, wherein the position of the terminal is located in the service range of the application layer server, or the service range of the user plane anchor point of the PDU session serving the application layer server.
In a possible embodiment, the processor 501 is specifically configured to:
acquiring terminal strategy information from a core network element entity;
the terminal strategy information is generated by the core network element entity according to the application layer server address sent by the application layer server and the service range of the application layer server.
In one possible embodiment, processor 501 is further configured to:
before accessing an application layer server according to an application layer server address in terminal strategy information, if a PDU session for accessing the application layer server is established, determining whether the terminal meets an access condition of the application layer server address according to the terminal strategy information; alternatively, the first and second electrodes may be,
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information; alternatively, the first and second electrodes may be,
if first indication information sent by a core network element entity is received, determining whether a terminal meets an access condition of an application layer server address according to terminal strategy information; wherein the first indication information is used for indicating the service range change of the PDU session currently used for accessing the application layer server.
In one possible embodiment, processor 501 is further configured to:
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, before whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information, the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out by the terminal according to second indication information sent by a core network element entity, or the service range of the current application layer server is determined to be shifted out by the terminal;
the second indication information is used for indicating the terminal to move out of the service range of the PDU session currently used for accessing the application layer server, or determining that the terminal moves out of the service range of the current application layer server.
In one possible embodiment, processor 501 is further configured to:
if the first indication information is received, before whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information, the first indication information is received from a core network element entity serving the current PDU session;
the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point of a PDU session currently used for accessing the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In one possible embodiment, processor 501 is further configured to:
if the terminal is determined to meet the access condition of the address of the application layer server, before the application layer server is accessed according to the address of the application layer server in the terminal strategy information, when the service range of the application layer server comprises a tracking area TA list, if the tracking area where the terminal is located is determined to be located in the TA list, the terminal is determined to meet the access condition of the address of the application layer server; alternatively, the first and second electrodes may be,
when the service range of the application layer server comprises a data network access list DNAI, if the DNAI in the service range of the application layer server and the DNAI associated with the first PDU session are determined to have intersection, determining that the terminal meets the access condition of the address of the application layer server; the first PDU session is a PDU session which is established by the terminal and used for accessing the application layer service.
In one possible embodiment, processor 501 is further configured to:
receiving a DNAI associated with a first PDU session from an SMF entity serving the current PDU session during establishment or modification of the PDU session before determining that the terminal satisfies an access condition of an application layer server address if the DNAI intersects the DNAI associated with the PDU session currently serving the terminal.
In a possible embodiment, the application layer server is a local domain name system DNS server or an application server, and if the application layer server is a DNS server, the processor 501 is further configured to:
after accessing an application layer server, querying a DNS server to obtain an address of the application server;
and accessing the application server according to the address of the application server obtained by inquiry.
In one possible embodiment, the application server comprises an edge computing enabled server, or an edge computing application server.
Based on the same inventive concept, an embodiment of the present application provides a core network element entity, referring to fig. 6, the terminal includes a processor 601, a memory 602, and a transceiver 603, where:
a processor 601 for reading the program in the memory 602 and executing the following processes:
generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal strategy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point of a PDU session of the service application layer server;
and sending the terminal strategy information to the terminal.
In one possible embodiment, the processor 601 is further configured to:
after sending terminal strategy information to the terminal, if the terminal is determined to move out of the service range of the current PDU session anchor point, inserting the service range corresponding to the PDU session anchor point or changing the service range corresponding to the extra PDU session anchor point;
generating first indication information and sending the first indication information to the terminal; the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point of a PDU session currently used for accessing the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In one possible embodiment, the processor 601 is further configured to:
after sending the terminal strategy information to the terminal, if the terminal is determined to move out of the service range of the PDU session currently used for accessing the application layer server or the terminal is determined to move out of the service range of the current application layer server, generating second indication information and sending the second indication information to the terminal;
the second indication information is used for indicating that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server, or the terminal moves out of the service range of the current application layer server.
Based on the same inventive concept, an embodiment of the present application provides a terminal, please refer to fig. 7, where the terminal includes a processing module 701 and a transceiver module 702, where:
a processing module 701, configured to obtain terminal policy information from a core network element entity; the terminal strategy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point of a PDU session of the service application layer server;
a processing module 701, configured to access an application layer server according to an application layer server address in the terminal policy information if it is determined that the terminal meets an access condition of the application layer server address; the terminal meets the access condition of the address of the application layer server, wherein the position of the terminal is located in the service range of the application layer server, or the service range of the user plane anchor point of the PDU session serving the application layer server.
In a possible embodiment, the processing module 701 is specifically configured to:
acquiring terminal strategy information from a core network element entity;
the terminal strategy information is generated by the core network element entity according to the application layer server address sent by the application layer server and the service range of the application layer server.
In a possible embodiment, the processing module 701 is further configured to:
before accessing an application layer server according to an application layer server address in terminal strategy information, if a PDU session for accessing the application layer server is established, determining whether the terminal meets an access condition of the application layer server address according to the terminal strategy information; alternatively, the first and second electrodes may be,
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information; alternatively, the first and second electrodes may be,
if first indication information sent by a core network element entity is received, determining whether a terminal meets an access condition of an application layer server address according to terminal strategy information; wherein the first indication information is used for indicating the service range change of the PDU session currently used for accessing the application layer server.
In a possible embodiment, the processing module 701 is further configured to:
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, before whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information, the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out by the terminal according to second indication information sent by a core network element entity, or the service range of the current application layer server is determined to be shifted out by the terminal;
the second indication information is used for indicating the terminal to move out of the service range of the PDU session currently used for accessing the application layer server, or determining that the terminal moves out of the service range of the current application layer server.
In a possible embodiment, the processing module 701 is further configured to:
if the first indication information is received, before whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information, the first indication information is received from a core network element entity serving the current PDU session;
the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point of a PDU session currently used for accessing the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In a possible embodiment, the processing module 701 is further configured to:
if the terminal is determined to meet the access condition of the address of the application layer server, before the application layer server is accessed according to the address of the application layer server in the terminal strategy information, when the service range of the application layer server comprises a tracking area TA list, if the tracking area where the terminal is located is determined to be located in the TA list, the terminal is determined to meet the access condition of the address of the application layer server; alternatively, the first and second electrodes may be,
when the service range of the application layer server comprises a data network access list DNAI, if the DNAI in the service range of the application layer server and the DNAI associated with the first PDU session are determined to have intersection, determining that the terminal meets the access condition of the address of the application layer server; the first PDU session is a PDU session which is established by the terminal and used for accessing the application layer service.
In a possible embodiment, the processing module 701 is further configured to:
receiving a DNAI associated with a first PDU session from an SMF entity serving the current PDU session during establishment or modification of the PDU session before determining that the terminal satisfies an access condition of an application layer server address if the DNAI intersects the DNAI associated with the PDU session currently serving the terminal.
In a possible embodiment, the application layer server is a local domain name system DNS server or an application server, and if the application layer server is a DNS server, the processing module 701 is further configured to:
after accessing an application layer server, querying a DNS server to obtain an address of the application server;
and accessing the application server according to the address of the application server obtained by inquiry.
In one possible embodiment, the application server comprises an edge computing enabled server, or an edge computing application server.
Based on the same inventive concept, an embodiment of the present application provides a core network element entity, please refer to fig. 8, where the terminal includes a processing module 801 and a transceiver module 802, where:
a processing module 801, configured to generate terminal policy information according to an application layer server address sent by an application layer server and a service range of the application layer server; the terminal strategy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point of a PDU session of the service application layer server;
the transceiver module 802 is configured to send the terminal policy information to the terminal.
In a possible embodiment, the processing module 801 is further configured to:
after sending terminal strategy information to the terminal, if the terminal is determined to move out of the service range of the current PDU session anchor point, inserting the service range corresponding to the PDU session anchor point or changing the service range corresponding to the extra PDU session anchor point;
generating first indication information and sending the first indication information to the terminal; the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point of a PDU session currently used for accessing the application layer server or a service range corresponding to a changed extra PDU session anchor point.
In a possible embodiment, the processing module 801 is further configured to:
after sending the terminal strategy information to the terminal, if the terminal is determined to move out of the service range of the PDU session currently used for accessing the application layer server or the terminal is determined to move out of the service range of the current application layer server, generating second indication information and sending the second indication information to the terminal;
the second indication information is used for indicating that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server, or the terminal moves out of the service range of the current application layer server.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform any one of the server discovery methods as discussed above.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (16)

1. A server discovery method is applied to a terminal, and comprises the following steps:
directly acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server, the terminal policy information is generated by a core network element entity according to the application layer server address sent by the application layer server and the service range of the application layer server, and the core network element entity is a policy control function PCF entity;
if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
2. The method of claim 1, wherein prior to accessing the application layer server based on the application layer server address in the terminal policy information, comprising:
if the PDU session for accessing the application layer server is established, determining whether the terminal meets the access condition of the address of the application layer server according to the terminal strategy information; alternatively, the first and second electrodes may be,
if the service range of the PDU session currently used for accessing the application layer server is determined to be shifted out, or the service range of the currently accessed application layer server is determined to be shifted out, whether the terminal meets the access condition of the address of the application layer server is determined according to the terminal strategy information; alternatively, the first and second electrodes may be,
if first indication information sent by a core network element entity is received, determining whether the terminal meets the access condition of the application layer server address according to the terminal strategy information; wherein the first indication information is used for indicating the change of the service scope of the PDU session currently used for accessing the application layer server.
3. The method of claim 2, wherein before determining whether the access condition of the address of the application layer server is satisfied by the terminal according to the terminal policy information if it is determined to move out of a service range of a PDU session currently used for accessing the application layer server or it is determined to move out of a service range of a currently accessed application layer server, comprising:
determining that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server or determining that the terminal moves out of the service range of the current application layer server according to second indication information sent by a network element entity of a core network;
the second indication information is used for indicating that the terminal moves out of the service range of the PDU session currently used for accessing the application layer server, or determining that the terminal moves out of the service range of the current application layer server.
4. The method of claim 2, before determining whether the terminal satisfies the access condition of the application layer server address according to the terminal policy information if the first indication information is received, comprising:
receiving first indication information from a core network element entity serving a current PDU session;
wherein the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point currently used for accessing the PDU session of the application layer server or a service range corresponding to a changed extra PDU session anchor point.
5. The method of claim 1, wherein before accessing the application layer server according to the application layer server address in the terminal policy information if it is determined that the terminal satisfies the access condition of the application layer server address, the method comprises:
when the service range of the application layer server comprises a tracking area TA list, if the tracking area where the terminal is located is determined to be located in the TA list, determining that the terminal meets the access condition of the address of the application layer server; alternatively, the first and second electrodes may be,
when the service range of the application layer server comprises a data network access list DNAI, if the DNAI in the service range of the application layer server and the DNAI associated with the first PDU session are determined to have intersection, determining that the terminal meets the access condition of the address of the application layer server; and the first PDU session is a PDU session which is established by the terminal and used for accessing the application layer service.
6. The method of claim 5, prior to determining that the terminal satisfies the access condition for the application layer server address if it is determined that there is an intersection of the DNAI and a DNAI associated with a PDU session currently serving the terminal, comprising:
in establishing or modifying a PDU session, a DNAI associated with a first PDU session is received from an SMF entity serving the current PDU session.
7. The method of claim 1, wherein the application layer server is a local Domain Name System (DNS) server or an application server, and if the application layer server is a DNS server, after accessing the application layer server, the method comprises:
inquiring the DNS server to obtain an application server address;
and accessing the application server according to the address of the application server obtained by inquiry.
8. The method of claim 7, wherein the application server comprises an edge computing enabled server, or an edge computing application server.
9. A method for discovering a server is applied to a core network element entity, wherein the core network element entity is a Policy Control Function (PCF) entity, and the method comprises the following steps:
generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
sending the terminal strategy information to a terminal so that the terminal accesses the application layer server according to the application layer server address in the terminal strategy information if the terminal determines that the terminal meets the access condition of the application layer server address; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
10. The method of claim 9, wherein after sending the terminal policy information to a terminal, further comprising:
if the terminal is determined to move out of the service range of the current PDU session anchor point, inserting the service range corresponding to the PDU session anchor point or changing the service range corresponding to the extra PDU session anchor point;
generating first indication information and sending the first indication information to the terminal; wherein the first indication information is used for indicating a service range corresponding to an inserted PDU session anchor point currently used for accessing the PDU session of the application layer server or a service range corresponding to a changed extra PDU session anchor point.
11. The method of claim 9, wherein after sending the terminal policy information to a terminal, further comprising:
if the terminal is determined to move out of the service range of the PDU session currently used for accessing the application layer server or the terminal is determined to move out of the service range of the current application layer server, generating second indication information and sending the second indication information to the terminal;
the second indication information is used for indicating that the terminal moves out of a service range of a PDU session currently used for accessing the application layer server, or the terminal moves out of the service range of the current application layer server.
12. A terminal, comprising: a processor, a memory, and a transceiver;
a processor for reading the program in the memory and performing the following processes:
directly acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server, the terminal policy information is generated by a core network element entity according to the application layer server address sent by the application layer server and the service range of the application layer server, and the core network element entity is a policy control function PCF entity;
if the terminal is determined to meet the access condition of the application layer server address, accessing the application layer server according to the application layer server address in the terminal strategy information; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
13. A core network element entity, wherein the core network element entity is a policy control function PCF entity, and the core network element entity comprises: a processor, a memory, and a transceiver;
a processor for reading the program in the memory and performing the following processes:
generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server;
sending the terminal strategy information to a terminal so that the terminal accesses the application layer server according to the application layer server address in the terminal strategy information if the terminal determines that the terminal meets the access condition of the application layer server address; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
14. A terminal, comprising:
a transceiver module: the system is used for directly acquiring terminal strategy information from a core network element entity; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server, the terminal policy information is generated by a core network element entity according to the application layer server address sent by the application layer server and the service range of the application layer server, and the core network element entity is a policy control function PCF entity;
the processing module is used for accessing the application layer server according to the application layer server address in the terminal strategy information if the terminal is determined to meet the access condition of the application layer server address; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
15. A core network element entity, wherein the core network element entity is a policy control function PCF entity, and the core network element entity comprises:
a processing module: the terminal strategy information generating device is used for generating terminal strategy information according to the address of the application layer server sent by the application layer server and the service range of the application layer server; the terminal policy information comprises an application layer server address and an access condition of the application layer server address, wherein the access condition of the application layer server address comprises a service range of the application layer server or a service range of a user plane anchor point serving a PDU session of the application layer server;
the receiving and sending module is used for sending the terminal strategy information to a terminal so that the terminal accesses the application layer server according to the application layer server address in the terminal strategy information if the terminal determines that the terminal meets the access condition of the application layer server address; the terminal meeting the access condition of the address of the application layer server comprises the position of the terminal in the service range of the application layer server or the service range of a user plane anchor point of a PDU session serving the application layer server.
16. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-8 or 9-11.
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