WO2021168715A1 - Procédé, appareil et système de découverte d'application - Google Patents

Procédé, appareil et système de découverte d'application Download PDF

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Publication number
WO2021168715A1
WO2021168715A1 PCT/CN2020/076857 CN2020076857W WO2021168715A1 WO 2021168715 A1 WO2021168715 A1 WO 2021168715A1 CN 2020076857 W CN2020076857 W CN 2020076857W WO 2021168715 A1 WO2021168715 A1 WO 2021168715A1
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Prior art keywords
information
network element
application
application platform
address
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PCT/CN2020/076857
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English (en)
Chinese (zh)
Inventor
朱方园
陈中平
倪慧
李岩
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华为技术有限公司
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Priority to PCT/CN2020/076857 priority Critical patent/WO2021168715A1/fr
Publication of WO2021168715A1 publication Critical patent/WO2021168715A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels

Definitions

  • This application relates to the field of communication technology, and in particular to a method, device, and system for discovering applications.
  • IP Internet Protocol
  • FQDN fully qualified domain name
  • a terminal device can send a domain name resolution request to a domain name system (DNS) server.
  • DNS domain name system
  • the domain name resolution request carries the domain name to be queried.
  • the DNS server returns the IP address corresponding to the domain name, and the terminal device can pass the IP address Address to access the domain name.
  • Mobile edge computing (MEC) technology can deeply integrate access networks and Internet services. It deploys application server (AS) and mobile broadband (mobile broadband, MBB) core network service processing and resource scheduling functions together to the network edge close to the access network, and provides reliable, The ultimate service experience with ultra-low latency.
  • AS application server
  • MBB mobile broadband
  • a terminal device sends a domain name resolution request to a DNS server through a user plane funtion (UPF) network element connected to the MEC platform.
  • UPF user plane funtion
  • the application servers deployed on different MEC platforms to provide the same service have the same domain name, and these application servers have different IP addresses, how does the DNS server return the IP addresses of the application servers closer to the terminal device to the terminal device? Enabling terminal devices to access local services nearby is a problem to be solved urgently at present.
  • the embodiments of the present application provide a method, device, and system for discovering applications, which are used to realize that the DNS server returns the IP address of the application server closer to the terminal device to the terminal device so that the terminal device can access local services nearby.
  • an embodiment of the present application provides a method for discovering applications.
  • the method includes: a session management function network element obtains first information, and the session management function network element determines the first information at least according to the first information and the location information of the terminal device. Second information, the session management function network element sends the first domain name and the second information to the first user plane network element.
  • the first information includes the identifier of the first application corresponding to the first domain name and the location information of at least one application platform where the first application is located, and the second information is used to obtain the first application corresponding to the first domain name.
  • An IP address is used to obtain the first application corresponding to the first domain name.
  • the session management function network element obtains the first information, determines the second information at least according to the location information of the terminal device and the first information, and sends the first domain name and the second information to the first user plane network element, which can realize the current
  • the terminal device requests access to the first domain name at the location indicated by the location information of the terminal device, it can access the local service nearby, which can achieve a short delay in accessing the service, thereby ensuring higher communication efficiency.
  • the session management function network element determines a first application platform in at least one application platform where the first application is located according to the first information and the location information of the terminal device, where , The second information corresponds to the first application platform.
  • the network element with the session management function can determine an application platform from at least one application platform where the first application is located according to the location information of the terminal device and the first information.
  • the location information of the at least one application platform where the first application is located includes data network access identifiers DNAI respectively corresponding to the at least one application platform where the first application is located.
  • the second information includes DNAI corresponding to the first application platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the first information further includes: IP addresses corresponding to at least one application platform where the first application is located; the session management function network element is based on the first application platform and the The IP addresses respectively corresponding to at least one application platform where the first application is located determine the second information, and the second information includes the IP address corresponding to the first application platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the first information further includes the IP addresses of the local domain name system DNS servers respectively corresponding to at least one application platform where the first application is located; the session management function network element is based on the first application The application platform and the IP address of the local DNS server respectively corresponding to the at least one application platform on which the first application is located determine the second information, and the second information includes the IP address of the first local DNS server, wherein the first A local DNS server provides services for the first application platform.
  • the above design can be used to determine the first local DNS server, so that the first local DNS server determines the application platform closer to the terminal device, and further determines the IP address of the server of the first application deployed on the application platform as the first The first IP address corresponding to the domain name.
  • the first information further includes index information corresponding to at least one application platform where the first application is located, and the session management function network element determines the third information according to the first information, and The first user plane network element sends the third information; the session management function network element determines the second information according to the DNAI of the first application platform and the index information corresponding to at least one application platform on which the first application is located.
  • the second information includes index information corresponding to the DNAI corresponding to the first application platform
  • the third information includes the DNAI corresponding to the at least one application platform where the first application is located and where the first application is located. Correspondence relationship of index information corresponding to at least one application platform of.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the first information further includes index information corresponding to at least one application platform on which the first application is located and an IP address corresponding to at least one application platform on which the first application is located;
  • the session management function network element determines third information according to the first information, and sends the third information to the first user plane network element; the session management function network element determines the third information according to the first application platform, the The second information is determined by the IP address respectively corresponding to the at least one application platform where the first application is located and the index information respectively corresponding to the at least one application platform where the first application is located.
  • the third information includes a correspondence between an IP address corresponding to at least one application platform where the first application is located and index information corresponding to at least one application platform where the first application is located, and the second information
  • the index information corresponding to the IP address corresponding to the first application platform is included.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the first information further includes index information corresponding to at least one application platform on which the first application is located, and information about a local DNS server corresponding to at least one application platform on which the first application is located. IP address; the session management function network element determines third information according to the first information, and sends the third information to the first user plane network element; the session management function network element according to the first application
  • the index information corresponding to the platform, the at least one application platform where the first application is located, and the IP address of a local DNS server respectively corresponding to the at least one application platform where the first application is located determine the second information.
  • the third information includes the correspondence between the IP address of the local DNS server corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located.
  • the second information includes index information corresponding to the IP address of the first local DNS server, where the first local DNS server provides services for the first application platform.
  • the above design can be used to determine the first local DNS server, so that the first local DNS server determines the application platform closer to the terminal device, and further determines the IP address of the server of the first application deployed on the application platform as the first The first IP address corresponding to the domain name.
  • the method further includes: the session management function network element sends first indication information to the first user plane network element; the first indication information is used to indicate that the first user plane network element is receiving When the first request comes from the terminal device and the first request includes the first domain name, a second request is determined according to the second information, and the second request is sent to the first DNS server.
  • the first user plane network element can determine the second request according to the second information.
  • the method further includes: the session management function network element receiving fourth information from the first user plane network element, and the session management function network element is the The PDU session of the terminal device selects the local PDU session anchor point and the uplink classifier ULCL or branch point BP.
  • the fourth information includes at least one of DNAI corresponding to the second application platform where the first application is located, an IP address corresponding to the second application platform where the first application is located, and the first IP address;
  • the first IP address is the IP address of the server of the first application deployed on the second application platform.
  • the session management function network element can select the local PDU session anchor point according to the fourth information, and further, select ULCL or BP for the PDU session to achieve local offloading, optimize the service access path, and improve communication efficiency.
  • the method further includes: the session management function network element determines, in the at least one application platform, the third information based on the first information and the updated location information of the terminal device. Application platform; the session management function network element sends the first domain name and updated second information to the first user plane network element, where the updated second information corresponds to the third application platform; The session management function network element receives a notification message from the first user plane network element, where the notification message is used to instruct the session management function network element to send a non-access stratum NAS message to the terminal device, so The NAS message includes the first domain name.
  • the above design can realize that when the location of the terminal device changes, the session management function network element sends the updated second information to the first user plane network element, so that the first user plane network element can be based on the updated second information
  • the information determines whether it is necessary to notify the terminal device to initiate a DNS query through the session management function network element.
  • an embodiment of the present application provides a method for discovering applications.
  • the method includes: a first user plane network element receives a first domain name and second information from a session management function network element, and the first user plane network element The element receives a first request from the terminal device, the first request includes the first domain name; the first user plane network element determines a second request according to the second information, and sends it to the first DNS server Send the second request.
  • the second information is determined by the session management function network element at least according to the location information of the terminal device, the location information of the terminal device indicates that the terminal device is in the first position, and the second request is used to The terminal device obtains the first IP address corresponding to the first domain name when the terminal device is located at the first location.
  • the first user plane network element receives the second information from the session management function network element, and when the first user plane network element receives the first request from the terminal device, and the first request includes the first domain name , The first user plane network element determines the second request according to the second information, so that when the terminal device requests access to the first domain name at the location indicated by the location information of the terminal device, it can access the local service nearby, and the service can be accessed.
  • the delay is shorter, and higher communication efficiency can be ensured.
  • the second information includes a DNAI corresponding to a first application platform, and at least one application platform on which the first application is located includes the first application platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the second information includes an IP address corresponding to a first application platform, and at least one application platform on which the first application is located includes the first application platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the second information includes the IP address of the first local DNS server, where the first local DNS server provides services for the first application platform, and at least one application where the first application is located
  • the platform includes the first application platform.
  • the above design can be used to determine the first local DNS server, so that the first local DNS server determines the application platform closer to the terminal device, and further determines the IP address of the server of the first application deployed on the application platform as the first The first IP address corresponding to the domain name.
  • the second information includes index information corresponding to DNAI corresponding to the first application platform, and at least one application platform on which the first application is located includes the first application platform; the first user The plane network element receives third information from the session management function network element; the third information includes the DNAI corresponding to the at least one application platform where the first application is located and at least one application where the first application is located. Correspondence of index information corresponding to each platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the second information includes index information corresponding to the IP address corresponding to the first application platform, and at least one application platform on which the first application is located includes the first application platform;
  • the user plane network element receives the third information from the session management function network element; the third information includes the respective IP addresses of at least one application platform where the first application is located and at least the address where the first application is located. Correspondence of index information corresponding to one application platform.
  • the above design can be used to make the DNS server determine the application platform closer to the terminal device, and further determine the IP address of the server of the first application deployed on the application platform as the first IP address corresponding to the first domain name.
  • the second information includes index information corresponding to the IP address of the first local DNS server, where the first local DNS server provides services for the first application platform, and the first application is located At least one application platform of the application platform includes the first application platform; the first user plane network element receives third information from the session management function network element; the third information includes at least the first application The corresponding relationship between the IP address of the local DNS server corresponding to one application platform and the index information respectively corresponding to the at least one application platform where the first application is located.
  • the above design can be used to determine the first local DNS server, so that the first local DNS server determines the application platform closer to the terminal device, and further determines the IP address of the server of the first application deployed on the application platform as the first The first IP address corresponding to the domain name.
  • the method further includes: the first user plane network element receives first indication information from the session management function network element; the first indication information is used to indicate the first user plane
  • the network element receives the first request from the terminal device and the first request includes the first domain name, it determines a second request according to the second information, and sends the second request to the first request.
  • a DNS server receives first indication information from the session management function network element; the first indication information is used to indicate the first user plane
  • the first user plane network element can determine the second request according to the second information.
  • the first user plane network element adds the DNAI corresponding to the first application platform to the first request, obtains a second request, and sends the second request to the
  • the first DNS server the first DNS server is a centralized DNS server.
  • the first user plane network element can determine the second request according to the second information.
  • the first user plane network element adds the IP address corresponding to the first application platform to the first request, obtains a second request, and sends the second request to all
  • the first DNS server is a centralized DNS server.
  • the first user plane network element can determine the second request according to the second information.
  • the first user plane network element modifies the target address of the first request to the IP address of the first local DNS server, obtains the second request, and transfers the second request to the IP address of the first local DNS server. Sent to the first DNS server, where the first DNS server is the first local DNS server.
  • the first user plane network element can determine the second request according to the second information.
  • the method further includes: the first user plane network element sends fourth information to the session management function network element, and the fourth information includes the corresponding information of the second application platform where the first application is located. At least one of the DNAI, the IP address corresponding to the second application platform where the first application is located, and the first IP address; wherein the first IP address is deployed on the second application platform The IP address of the server of the first application.
  • the session management function network element can select the local PDU session anchor point according to the fourth information, and further, select ULCL or BP for the PDU session to achieve local offloading, optimize the service access path, and improve communication efficiency.
  • the method further includes: the first user plane network element receiving the first domain name and updated second information from the session management function network element, the updated second The information corresponds to the third application platform; the first user plane network element sends a notification message to the session management function network element, and the notification message is used to instruct the session management function network element to send to the terminal device NAS message, where the NAS message includes the first domain name.
  • the method further includes: before the first user plane network element sends the notification message to the session management function network element, the first user plane network element determines that the first domain name corresponds to The retention time TTL of the DNS cache records in the DNS does not exceed the preset duration.
  • the first user plane network element determines that it needs to pass the session management function according to the updated second information.
  • the network element informs the terminal device to initiate a DNS query.
  • this application provides a communication device, which may be a session management function network element or a chip in a session management function network element.
  • the device may include a processing unit, a sending unit, and a receiving unit. It should be understood that the sending unit and the receiving unit here may also be a transceiving unit.
  • the processing unit may be a processor, the sending unit and the receiving unit may be transceivers;
  • the session management function network element may also include a storage unit, and the storage unit may be a memory;
  • the storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the session management function network element executes the first aspect or any one of the possible design methods in the first aspect.
  • the processing unit may be a processor, the sending unit and the receiving unit may be input/output interfaces, pins or circuits, etc.; the processing unit executes what is stored in the storage unit Instructions to make the chip execute the first aspect or any one of the possible design methods in the first aspect.
  • the storage unit is used to store instructions.
  • the storage unit can be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit outside the chip in the session management function network element (for example, only Read memory, random access memory, etc.).
  • the present application provides a communication device, which may be a first user plane network element or a chip in the first user plane network element.
  • the device may include a processing unit, a sending unit, and a receiving unit. It should be understood that the sending unit and the receiving unit here may also be a transceiving unit.
  • the processing unit may be a processor, the sending unit and the receiving unit may be transceivers; the first user plane network element may also include a storage unit, and the storage unit may be a memory
  • the storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the first user plane network element executes the second aspect or any one of the possible design methods in the second aspect.
  • the processing unit may be a processor, the sending unit and the receiving unit may be input/output interfaces, pins or circuits, etc.; the processing unit executes what is stored in the storage unit , So that the chip executes the second aspect or any one of the possible design methods in the second aspect.
  • the storage unit is used to store instructions.
  • the storage unit can be a storage unit (for example, a register, a cache, etc.) in the chip, or a storage unit outside the chip in the first user plane network element (for example, Read only memory, random access memory, etc.).
  • the present application also provides a readable storage medium that stores instructions, and when the instructions are executed, the method of the first aspect or the second aspect described above is implemented.
  • the present application also provides computer program code, which when running on a computer, causes the computer to execute the method of the first aspect or the second aspect.
  • the present application also provides a computer program product containing a program, which when running on a computer, causes the computer to execute the method of the first aspect or the second aspect.
  • the present application also provides a communication device including a processor and a memory; the memory is used to store computer execution instructions; the processor is used to execute the computer execution instructions stored in the memory, so that the communication device executes the method of the first aspect above .
  • the present application also provides a communication device including a processor and an interface circuit; the interface circuit is used to receive code instructions and transmit them to the processor; the processor runs the code instructions to execute the above-mentioned first aspect or second aspect method.
  • the present application also provides a communication system.
  • the communication system includes a session management function network element and a first user plane network element.
  • the session management function network element executes the method of the first aspect, and the first user plane network element executes the foregoing The second aspect of the method.
  • Figure 1 is one of the schematic diagrams of the 5G system architecture in this application.
  • FIG. 2 is the second schematic diagram of the 5G system architecture in this application.
  • Figure 3 is a schematic diagram of domain name access in the application
  • Figure 4 is a schematic diagram of the PDU session establishment process in the application
  • FIG. 5 is a schematic diagram of the terminal device requesting the IP address corresponding to the domain name after the initial establishment of the PDU session in this application;
  • FIG. 6 is one of the flowcharts of the method for discovering applications in this application.
  • Figure 7 is the second flow chart of the method for discovering applications in this application.
  • FIG. 8 is one of the specific flowcharts of the UE requesting the IP address corresponding to the domain name in this application;
  • Figure 9 is the second specific flowchart of the UE requesting the IP address corresponding to the domain name in this application.
  • Figure 10 is the third specific flowchart of the UE requesting the IP address corresponding to the domain name in this application;
  • Figure 11 is the fourth specific flowchart of the UE requesting the IP address corresponding to the domain name in this application;
  • Figure 12 is the fifth specific flowchart of the UE requesting the IP address corresponding to the domain name in this application;
  • Figure 13 is the sixth specific flowchart of the UE requesting the IP address corresponding to the domain name in this application;
  • FIG. 14 is a schematic diagram of a network structure composed of network elements that may be involved in a UE requesting an IP address corresponding to a domain name in this application;
  • FIG. 15 is a schematic diagram of the SMF update translation table in this application.
  • FIG. 16 is one of the schematic structural diagrams of a communication device in this application.
  • FIG. 17 is the second structural diagram of a communication device in this application.
  • FIG. 1 and FIG. 2 are schematic diagram of a 5G network architecture based on a point-to-point interface.
  • the main difference between Fig. 1 and Fig. 2 is that the interfaces between the various network elements in Fig. 2 are point-to-point interfaces rather than service-oriented interfaces.
  • FIG. 6 to FIG. 12 can be applied to but not limited to the network architecture shown in FIG. 1 and FIG. 2.
  • the 5G network architecture can include three parts, namely the terminal equipment part, the data network (DN) and the operator network part.
  • the terminal device may also be referred to as a terminal (terminal), user equipment (UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), and so on.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (Augmented Reality, AR) terminal devices, industrial control (industrial control) ), wireless terminals in self-driving (self-driving), wireless terminals in remote surgery (remote medical surgery), wireless terminals in smart grid (smart grid), transportation safety (transportation safety) Wireless terminal, wireless terminal in smart city, wireless terminal in smart home, etc.
  • VR virtual reality
  • AR Augmented Reality
  • AR industrial control
  • wireless terminals in self-driving self-driving
  • wireless terminals in remote surgery remote surgery
  • wireless terminals in smart grid smart grid
  • transportation safety transportation safety
  • the operator’s network may include one or more of the following network elements: authentication server function (AUSF) network element, network exposure function (NEF) network element, policy control function (policy control function, PCF) network element, unified data management (UDM) network element, unified data repository (UDR), network storage function (network repository function, NRF) network element, application function (AF) network Element, access and mobility management function (AMF) network element, session management function (SMF) network element, radio access network (RAN), and user plane function ( user plane function, UPF) network elements, etc.
  • AUSF authentication server function
  • NEF network exposure function
  • policy control function policy control function
  • PCF policy control function
  • UDM unified data management
  • UDR network storage function
  • AF application function
  • AMF access and mobility management function
  • SMF session management function
  • RAN radio access network
  • UPF user plane function
  • RAN is used to implement functions related to wireless access
  • the AMF network element is used to implement mobility management functions, and is responsible for user mobility management, including mobility status management, assigning user temporary identities, and authenticating and authorizing users;
  • SMF network elements are used to implement session management functions, are responsible for UPF network element selection, UPF network element reselection, IP address allocation, bearer establishment, modification and release, and quality of service (QoS) control;
  • PCF network elements include policy control decision-making and flow-based charging control functions, including user subscription data management functions, policy control functions, charging policy control functions, QoS control, etc.;
  • the UDM network element is responsible for managing the contracted data, and when the contracted data is modified, it is responsible for notifying the corresponding network element.
  • UDR is used to store and retrieve contract data, policy data, and public architecture data, etc., for UDM network elements, PCF network elements, and NEF network elements to obtain relevant data.
  • UDR can have different data access authentication mechanisms for different types of data (such as contract data, policy data) to ensure the security of data access; UDR can return and carry appropriate data for illegal servicing operations or data access requests The failure response for the reason value.
  • the AF network element is used to provide a certain application layer service to the UE.
  • the AF provides the service to the UE, it has requirements for QoS and charging strategies and needs to notify the network.
  • AF also needs application-related information fed back from the core network.
  • NEF network elements mainly support network capability opening functions, opening network capabilities and services to the outside world; 3GPP network functions (network functions, NF) publish functions and events to other NFs through NEF. The capabilities and events opened by NF can be safely opened to third-party applications.
  • NEF uses UDR's standardized interface (Nudr) to store or retrieve structured data, and translate AF exchange information with internal network function exchange information. For example, it will use the AF service identifier (AF-Service-Identifier) and internal 5G core information (such as data network name (DNN), single network slice selection assistance information, S- NSSAI)).
  • AF-Service-Identifier AF-Service-Identifier
  • DNN data network name
  • S- NSSAI single network slice selection assistance information
  • UPF User Plane Function
  • network elements can support all or part of the following functions: interconnecting protocol data unit (PDU) sessions with data networks; packet routing and forwarding (for example, supporting uplink classifiers for traffic) classifier, ULCL) and then forwarded to the data network, support branch point (branching point, BP) to support multi-homed (multi-homed) PDU session); data packet inspection.
  • PDU protocol data unit
  • ULCL packet routing and forwarding
  • BP branch point
  • BP branch point
  • multi-homed multi-homed
  • network elements involved in the embodiments of the present application also include: DNS proxy (proxy), address resolution function (ARF) and DNS server (server).
  • DNS proxy proxy
  • ARF address resolution function
  • DNS server server
  • DNS proxy refers to enabling the DNS proxy function on the firewall, so that when there is no DNS server inside the LAN, the client inside the LAN can connect to the external DNS server through the firewall, and access the Internet (internet) through the correct DNS resolution of the external DNS server.
  • the working mechanism of DNS proxy is as follows: The DNS client sends a DNS request message to the DNS proxy. At this time, the destination address of the message is the IP address of the DNS proxy. After the DNS proxy receives the message, it replaces the destination address in the message with the IP address of the DNS server, and then forwards the message to the DNS server according to the configured DNS server address. If multiple DNS server addresses are configured on the DNS proxy, the DNS proxy first sends the message to the first DNS server. If the first DNS server does not respond, the DNS client will resend the DNS request after waiting for the timeout After the DNS proxy receives the resent DNS request packet, it forwards it to the second DNS server, and so on, until a DNS server sends a response packet.
  • the DNS server is responsible for resolving the domain name into an IP address. For example, the client sends a domain name query request to the DNS server, and the DNS server returns the IP address corresponding to the domain name, and the terminal device can access the domain name through the IP address.
  • the function of the network element with the address resolution function can support the functions of DNS proxy and DNS server at the same time, or only support the function of DNS proxy or the function of DNS server.
  • the current domain name access process is as follows: Take the terminal device accessing domain name A (for example, www.qq.com) as an example, when the terminal device accesses the domain name A, query whether the terminal device’s cache exists If the IP address corresponding to the domain name A exists, the terminal device can directly obtain the IP address and access the domain name A through the IP address; if it does not exist, the terminal device can send a domain name resolution request to the DNS server, and the domain name resolution request Carrying the domain name A, the DNS server returns the IP address corresponding to the domain name A, and the terminal device can access the domain name A through the IP address.
  • domain name A for example, www.qq.com
  • the terminal device After obtaining the IP address corresponding to domain name A, the terminal device generates and caches a DNS cache record.
  • the DNS cache record is used to indicate the correspondence between the domain name A and the IP address.
  • the terminal device also maintains a corresponding time to live (TTL) for the DNS cache record.
  • TTL of the DNS cache record refers to the retention time of the DNS cache record in the cache of the terminal device. In this way, when the terminal device needs to access the domain name A in the DNS cache record again within the TTL of the DNS cache record, the terminal device can directly obtain the IP address corresponding to the domain name A according to the DNS cache record. When the TTL of the DNS cache record is exceeded, the terminal device needs to obtain the IP address corresponding to domain name A through the DNS server through the above process.
  • FIG. 5 is a schematic diagram of a terminal device requesting an IP address corresponding to a domain name after the initial establishment of a PDU session is completed.
  • the core network allocates IP-3 to the terminal device during the initial establishment of the PDU session
  • the remote PSA will change the DNS of the terminal device
  • the query request is sent to the DNS server.
  • there may be multiple application servers corresponding to domain name A which are respectively deployed in different locations.
  • the application server corresponding to domain name A is deployed on two different MEC platforms, namely MEC platform-1 and MEC platform-2.
  • the IP addresses of the two application servers are IP-3A and IP-1 respectively.
  • the application server with IP address IP-3A is deployed on MEC platform-1
  • the application server with IP address IP-1 is deployed on MEC platform-2
  • the distance between the deployment location of MEC platform-1 and the remote PSA Closer means a longer distance from the current position of the terminal device, while the deployment position of the MEC platform-1 is farther away from the remote PSA, and closer to the current position of the terminal device.
  • the DNS service Since the DNS server does not perceive the current location of the terminal device, the DNS service receives the DNS query request from the terminal device from the remote PSA, according to the address affinity, and returns according to the requested domain name A to be closer to the remote PSA Therefore, the DNS server returns the address of the application server deployed on the MEC platform-1 (IP-3A in Figure 5), so that the terminal device cannot obtain the application server deployed on the MEC platform-2 The IP address of the terminal device cannot access nearby services through the application server deployed on the MEC platform-2. In addition, since the terminal device accesses the service through the remote application server, the time delay for the terminal device to access the service is increased, and the communication efficiency is reduced.
  • the location information of the terminal device may refer to the tracking area identity (TAI) of the terminal device.
  • TAI tracking area identity
  • the location information of an application platform can be represented by a data network access identifier (DN Access Identifier, DNAI) corresponding to the application platform or an IP address corresponding to the application platform.
  • DN Access Identifier DNAI
  • the IP address corresponding to an application platform refers to the IP address required on the routing path when the network element device in the network accesses the application platform, or the IP address corresponding to an application platform refers to the network element device and the network element device in the network.
  • the IP address corresponding to an application platform may be a public network IP address required to access the application platform, for example, the public network IP address is any public network IP in the public network IP address space of the entrance of the application platform address.
  • the IP address corresponding to an application platform may be a subnet (subnet) IP address or a full IP address (full IP address) required to access the application platform.
  • the subnet IP address is a UPF network element through N6
  • NAT network address translation
  • a local DNS server can be understood as a DNS server located in a local data center.
  • the local DNS server is closer to the current location of the UE.
  • the local DNS server is mainly responsible for domain name resolution for applications deployed on the local application platform or on the MEC platform.
  • the DNS server serving the local application platform or the MEC platform may be called a local DNS server, and the local DNS server is on the local application platform or the MEC
  • the applications deployed on the platform perform domain name resolution.
  • the local DNS server can be deployed by the operator or a third party.
  • a centralized DNS server can be understood as a DNS server located in a centralized data center or a DNS server located on a remote management platform and far from the current location of the UE.
  • the centralized DNS server can also be referred to as a remote DNS server.
  • the centralized DNS server can be deployed by the operator.
  • the domain name resolution capabilities (that is, the types of domain names that can be resolved) supported by the local DNS server and the centralized DNS server in this application may be the same or different, and this application is not limited.
  • the embodiment of the present application provides a method for discovering applications.
  • the method is used to realize that the DNS server returns the IP address of the application server closer to the terminal device to the terminal device so that the terminal device can access local services nearby.
  • using the method provided in the embodiments of the present application can also realize that after the DNS server returns the IP address of the application server close to the terminal device to the terminal device, the service traffic can be selectively routed to the application platform where the application server is located.
  • the method includes:
  • Step 600 The SMF network element obtains the first information.
  • the first information includes the identification of the first application corresponding to the first domain name and the location information of at least one application platform where the first application is located; or, the first information includes the first domain name and the information of at least one application platform where the first application is located.
  • Location information or, the first information includes the first domain name, the identification of the first application corresponding to the first domain name, and the location information of at least one application platform on which the first application is located.
  • the SMF network element can adopt but not limited to the following possible designs to obtain the first information:
  • the SMF network element may locally configure the first information.
  • the SMF network element obtains the first information from other network elements.
  • the AF network element stores the first information in the UDR.
  • the SMF network element calls the PCF network element's servicing operation policy establishment control request (Npcf_SMPolicy Control_Create Request), requesting to obtain the policy information related to the PDU session from the PCF network element.
  • the PCF network element invokes the service operation request (Nudr_DM_Query) of the UDR, and obtains information related to the application subscribed by the terminal device from the UDR, including the first information.
  • the PCF network element generates a policy and charging control rule (Policy and Charging Control rule, PCC rule) from the first information, and the PCC rule includes the first information.
  • Policy and Charging Control rule Policy and Charging Control rule, PCC rule
  • a control response (Npcf_SMPolicyControl_Create Response) is established through a service-based operation policy and sent to the SMF network element, and the SMF saves the PCC rule.
  • part of the information in the first information may be stored in the SMF network element in a locally configured manner, and another part of the information in the first information may be obtained from other network elements.
  • the SMF network element may locally configure the identification of the first application corresponding to the first domain name, and the SMF network element obtains the location information of at least one application platform where the first application is located from the PCF network element or the NEF network element.
  • the element or NEF network element stores the location information of at least one application platform where the first application is located.
  • At least one application platform where the first application is located indicates that one or more application platforms exist, and the server of the first application is deployed on these application platforms.
  • the application platform here can refer to the MEC platform, also known as the management platform, or the application management platform.
  • the location information of the at least one application platform where the first application is located may be described as the location information of the at least one application platform where the server deploying the first application is located, which is not limited in this application.
  • the location information of the at least one application platform where the first application is located may include DNAIs respectively corresponding to the at least one application platform where the first application is located.
  • Step 610 The SMF network element determines second information at least according to the first information and the location information of the terminal device. The second information is used to obtain the first IP address corresponding to the first domain name.
  • An implementation method for the SMF network element to obtain the location information of the terminal device is that the SMF network element can obtain the location information of the terminal device from other network elements.
  • the SMF network element can obtain the TAI of the terminal device from the AMF network element.
  • the SMF network element can also request the TAI of the terminal device from the AMF network element.
  • the AMF network element can provide the SMF network element with the current latest TAI of the terminal device, so that the SMF network element can determine the location information of the terminal device based on the current latest TAI of the terminal device.
  • the SMF network element determines the first application platform in at least one application platform where the first application is located according to the first information and the location information of the terminal device.
  • the SMF network element may determine, from at least one application platform where the first application is located, at least one application platform that is closer to the terminal device, that is, the first application platform, based on the first information and the location information of the terminal device.
  • the first application platform deploys the server of the first application, and the number of the first application platform may be one or more.
  • the first application platform is the application platform where the server of the first application is located when the terminal device accesses the server of the first application through the optimized path at the current location.
  • the terminal device is deployed to the first application platform.
  • the routing path of the data message is the optimal path under the current network topology condition. If the terminal device accesses the server of the first application through the optimized path at the current location, the number of application platforms where the server of the first application is located is multiple, then the number of the first application platform is multiple.
  • the SMF network element may also determine the first application platform in at least one application platform where the first application is located in combination with other information, such as load information of the application platform, network topology information, etc., which is not limited in this application.
  • the SMF network element may determine multiple application platforms in at least one application platform where the first application is located according to the first information and the location information of the terminal device, and the SMF network element may further combine the load information corresponding to the multiple application platforms to determine The application platform with the lowest load is regarded as the first application platform.
  • the SMF network element may use the first information and the location information of the terminal device (for example, TAI ), determining at least one first application platform from at least one application platform where the first application is located. Specifically, there may be a mapping relationship or a corresponding relationship between the location information of the terminal device and the DNAI respectively corresponding to the at least one application platform where the first application is located.
  • the SMF network element may determine at least one first application platform from at least one application platform where the first application is located according to the location information of the terminal device.
  • the following describes the specific content included in the second information based on the different content included in the first information.
  • the first possible form if the location information of the at least one application platform where the first application is located includes the DNAI corresponding to the at least one application platform where the first application is located, the second information includes the DNAI corresponding to the first application platform.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Since there is a corresponding relationship between the application platform and the DNAI corresponding to the application platform, the SMF network element can obtain the DNAI corresponding to the first application platform as the second information after determining the first application platform.
  • the second information may be represented by a DNAI list.
  • the DNAI list contains at least one DNAI. If the number of the first application platform is multiple, the DNAI list includes multiple DNAIs.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2).
  • the SMF network element may determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and use DNAI1 as the second information.
  • the DNAI corresponding to an application platform can represent the location information of the application platform. Therefore, when the SMF network element sends the DNAI corresponding to the first application platform as the second information to the first UPF network element, the first UPF network element The DNAI corresponding to the first application platform can be added to the first request to obtain the second request, and send the second request to the first DNS server, so that the first DNS server can determine the first domain name corresponding to the location information of the first application platform The first IP address.
  • a second possible form if the first information further includes the IP addresses corresponding to at least one application platform where the first application is located, the second information includes the IP address corresponding to the first application platform.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Further, since the application platform has a corresponding relationship with the IP address corresponding to the application platform, the first application platform is determined. After an application platform, the SMF network element determines the IP address corresponding to the first application platform according to the IP addresses corresponding to the at least one application platform where the first application is located, as the second information.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the IP addresses respectively corresponding to at least one application platform where the first application is located include IP-1 (corresponding to DNAI1) and IP-2 (corresponding to DNAI2).
  • the SMF network element may determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and use IP-1 as the second information according to DNAI1.
  • DNS query messages can add an EDNS client subnet option (ECS (EDNS Client Subnet) option), which contains the client’s IP address for DNS
  • ECS EDNS Client Subnet
  • the server better determines the IP address corresponding to the domain name requested by the client based on the IP address of the client. Since the IP address of the terminal device does not reflect the location of the terminal device, in this application, the SMF network element sends the IP address corresponding to the first application platform as the second information to the first UPF network element.
  • the element can add the second information as an ECS option to the first request, obtain the second request, and send the second request to the first DNS server, so that the first DNS server can better determine the terminal device request query according to the ECS option
  • the IP address corresponding to the first domain name. Therefore, the second information can be represented by ECS option list.
  • the ECS option list contains at least one ECS option. If there are multiple first application platforms, the ECS option list includes multiple ECS options.
  • Each ECS option includes an IP address. Among them, the IP address included in the ECS option is the corresponding IP address of the application platform. The description of the IP address can refer to the previous description, and the repetition will not be repeated.
  • the IP address corresponding to an application platform can represent the location information of the application platform. Therefore, the SMF network element sends the IP address corresponding to the first application platform as the second information to the first UPF network element.
  • the meta can add the IP address corresponding to the first application platform to the first request, obtain the second request, and send the second request to the first DNS server, so that the first DNS server determines the first domain name according to the location information of the first application platform The corresponding first IP address.
  • a third possible form if the first information further includes the IP addresses of the local DNS servers respectively corresponding to at least one application platform where the first application is located.
  • the second information includes the IP address of the first local DNS server, and the first local DNS server provides services for the first application platform.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Further, since the application platform has a corresponding relationship with the IP address of the local DNS server corresponding to the application platform, After determining the first application platform, the SMF network element determines the IP address of the first local DNS server according to the IP addresses of the local DNS servers respectively corresponding to the at least one application platform where the first application is located, as the second information.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the IP addresses of the local DNS servers respectively corresponding to at least one application platform where the first application is located include local DNS server IP-1 (corresponding to DNAI1) and local DNS server IP-2 (corresponding to DNAI2).
  • the SMF network element can determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and use the local DNS server IP-1 as the second information according to DNAI1.
  • the first application platform can be understood as a local application platform or an MEC platform, and the local DNS server serving the first application platform is called the first local DNS server.
  • the local DNS server serving the first application platform is called the first local DNS server.
  • at least one application platform on which the first application is located includes multiple local application platforms or multiple MEC platforms, there may be multiple local DNS servers serving the local application platform or the MEC platform. It can be understood that if the number of first application platforms is multiple, and the local DNS servers corresponding to the multiple first application platforms are also multiple, in this case, the SMF network element can select a local DNS based on the local policy.
  • the server serves as the first local DNS server.
  • the SMF network element uses the local DNS server with a lighter load as the first local DNS server based on the load condition of each local DNS server in the multiple local DNS servers.
  • the SMF network element uses the local DNS server with more supported domain name query lists as the first local DNS server based on the domain name query list supported by each of the multiple local DNS servers.
  • the SMF network element can use the lighter-loaded application platform as the target application platform based on the load conditions of multiple first application platforms, and further, determine the local DNS server corresponding to the target application platform as the first local DNS server.
  • the SMF network element sends the IP address of the first local DNS server as the second information to the first UPF network element, and the first UPF network element modifies the target address of the first request to the IP address of the first local DNS server to obtain And send the second request to the first DNS server, where the first DNS server is the first local DNS server, so that the first local DNS server determines the first IP address corresponding to the first domain name.
  • the SMF network element can obtain the corresponding relationship between the domain name, the identification of the application, and the location information of at least one application platform where the application is located, as shown in Table 1.
  • Table 1 can be understood as the correspondence between the identifiers of all applications deployed in the entire network, the domain names corresponding to each application in all applications, and the location information of at least one application platform where each application in all applications is located (hereinafter referred to as Is the first type of correspondence), which can also be understood as the identification of some applications deployed in the entire network, the domain name corresponding to each application in some applications, and the location of at least one application platform where each application in some applications is located Information correspondence (hereinafter referred to as the second type of correspondence).
  • this application abbreviates all applications deployed in the entire network as all applications. In this application, some applications deployed in the entire network are referred to as partial applications for short.
  • the SMF network element can contract with the current terminal device according to the first type of correspondence.
  • the identification of multiple applications included in the information related to multiple applications, the identification of multiple applications contracted by the terminal device, the domain name corresponding to each of the multiple applications contracted by the terminal device, and the multiple applications contracted by the terminal device Correspondence of the location information of at least one application platform where each application in.
  • the SMF network element can obtain information related to multiple applications contracted by the current terminal device in the following manner: in the process of establishing a PDU session initiated by the terminal device, the SMF network element calls the PCF network element to request the PDU session to be obtained from the PCF network element After the relevant policy information, the PCF network element invokes the service operation request of the UDR, and obtains the information related to multiple applications subscribed by the terminal device from the UDR.
  • the multiple application related information subscribed by the terminal device includes the multiple subscribed information of the terminal device. The ID of an application.
  • the SMF network element if the SMF network element is not locally configured with the first type of correspondence, when the terminal device initiates the PDU session establishment process, the SMF network element calls the PCF network element to request the PDU from the PCF network element After the session-related policy information, the PCF network element invokes the service operation request of the UDR, and obtains the information related to the multiple applications subscribed by the terminal device and the corresponding relationship of the first type from the UDR. Among them, multiple applications subscribed by the terminal device The related information includes the identities of multiple applications subscribed by the terminal device. The PCF network element generates a Policy and Charging Control rule (PCC rule).
  • PCC rule Policy and Charging Control rule
  • the PCC rule includes the correspondence between multiple applications contracted by the terminal device and the first type, and the SMF network element stores the PCC rule. At this time, the SMF network element can save the corresponding relationship of the first type, and there is no need to obtain the corresponding relationship of the first type again when other terminal devices initiate the PDU session establishment process.
  • the SMF network element if the SMF network element is not locally configured with the first type of correspondence, the SMF network element calls the PCF network element to request the PCF network element to obtain the corresponding relationship when the terminal device initiates the PDU session establishment process.
  • the PCF network element invokes the service operation request of the UDR, and obtains the information related to the multiple applications subscribed by the terminal device and the corresponding relationship of the first type from the UDR.
  • the multiple subscribed terminal devices The application-related information includes the identities of multiple applications subscribed by the terminal device.
  • the PCF network element determines the identities of the multiple applications signed by the terminal device, the domain name corresponding to each of the multiple applications signed by the terminal device, and The corresponding relationship of the location information of at least one application platform where each of the multiple applications subscribed by the terminal device is located is recorded as Table 1*.
  • the PCF network element generates a PCC rule.
  • the PCC rule includes Table 1*, and sends a control response to the SMF network element through the establishment of a service-based operation strategy, and the SMF network element saves the PCC rule.
  • the correspondence between the domain names corresponding to the multiple applications contracted by the terminal device, the identifications of the multiple applications contracted by the terminal device, and the location information of at least one application platform where the multiple applications contracted by the terminal device are obtained by the SMF network element is the second Correspondence of various types.
  • the SMF network element is based on the location information of the terminal device, the identities of the multiple applications contracted by the terminal device, the domain name corresponding to each of the multiple applications contracted by the terminal device, and each of the multiple applications contracted by the terminal device.
  • the correspondence between the location information of at least one application platform where each application is located determines the DNAI list corresponding to each domain name in the multiple domain names.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the terminal device.
  • the information related to the application subscribed by the UE includes APP-1 and APP-2.
  • APP-1 corresponds to FQDN-A
  • APP-2 corresponds to FQDN-B.
  • SMF network element determines DNAI1 from DNAI1 and DNAI2 corresponding to FQDN-A according to the location information (TAI) of the UE and Table 1, and determines DNAI2 and DNAI3 from DNAI2 and DNAI3 corresponding to FQDN-B, which means that each domain name corresponds to each domain name.
  • the DNAI list of each domain name includes at least one DNAI, as shown in Table 2.
  • the SMF network element After the SMF network element determines the DNAI list corresponding to each domain name in the multiple domain names, the SMF network element sends the DNAI list corresponding to each domain name in the multiple domain names to the first UPF network element.
  • the SMF network element obtains Table 2, it further determines the DNAI list corresponding to FQDN-A and the DNAI list corresponding to FQDN-B according to Table 2. As shown in Table 3, Table 3 is sent to the first UPF network element .
  • the SMF network element determines the DNAI list corresponding to each domain name in the multiple domain names
  • the SMF network element determines each of the multiple domain names according to the correspondence between the application platform and the IP address corresponding to the application platform.
  • the ECS option list corresponding to the domain name, and the ECS option list corresponding to each of the multiple domain names is sent to the first UPF network element.
  • the SMF network element can locally configure the correspondence relationship between the application platform and the IP address corresponding to the application platform.
  • the SMF network element obtains Table 5 according to Tables 2 and 4, where the fourth The columns are obtained according to Table 4.
  • the ECS option list corresponding to FQDN-A and the ECS option list corresponding to FQDN-B are further determined according to Table 5.
  • Table 6 is sent to the first UPF network element.
  • the SMF network element determines multiple The IP address of the first local DNS server corresponding to each domain name in the domain names is sent to the first UPF network element.
  • the SMF network element can locally configure the correspondence between the application platform and the IP address of the local DNS server corresponding to the application platform.
  • the SMF network element obtains Table 8 according to Tables 2 and 7, where Table 8 The fourth column in is obtained according to Table 7, and further according to Table 8 to determine the IP address of the first local DNS server corresponding to FQDN-A and the IP address of the first local DNS server corresponding to FQDN-B, as shown in Table 9.
  • Step 620 The SMF network element sends the first domain name and the second information to the first UPF network element.
  • the SMF network element selects the first UPF network element as the PDU of the terminal device according to parameters such as data network name (DNN) and single network slice selection assistance information (S-NSSAI).
  • DNN data network name
  • S-NSSAI single network slice selection assistance information
  • the anchor point of the session the SMF network element sends an N4 session (N4session) establishment request message to the first UPF network element, and the N4 session establishment request message needs to carry the first domain name and the second information.
  • the N4 session establishment request message carries a domain name translation table.
  • the translation table includes the first domain name and the second information.
  • the foregoing steps 600 to 620 are performed before step 630.
  • the foregoing steps 600 to 620 are performed during the establishment of a PDU session of the terminal device.
  • Step 630 The first UPF network element receives a first request from the terminal device, where the first request includes the first domain name.
  • the first UPF network element queries whether to save the second information corresponding to the first domain name according to the first domain name, that is, the first UPF network element has received the second information corresponding to the first domain name from the SMF network element, if If it exists, perform step 640; otherwise, the first UPF network element forwards the first request to the DNS server or DNS proxy indicated by the target address of the first request.
  • the first UPF receives the N4 session establishment request message from the SMF network element, and the N4 session establishment request message carries a translation table, and the translation table includes Table 6. If the first UPF network element receives the first request from the UE, and the first request includes FQDN-A, the first UPF network element queries FQDN-A according to Table 6, and determines that there is an ECS option (IP- 1), and further execute step 640.
  • IP- 1 ECS option
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-E, the first UPF network element queries FQDN-E according to Table 12, determines that there is no ECS option corresponding to FQDN-A, and The first request is further forwarded to the DNS server or DNS proxy indicated by the target address of the first request.
  • Step 640 The first UPF network element determines the second request according to the second information, and sends the second request to the first DNS server.
  • the second request is used to obtain the first IP corresponding to the first domain name when the terminal device is located in the first location. address.
  • the location information of the terminal device indicates that the terminal device is in the first position.
  • the first UPF network element determines the second request according to the second information and sends the second request to the first DNS server may also include the following three situations:
  • the second information includes the DNAI corresponding to the first application platform.
  • the first UPF network element adds the DNAI corresponding to the first application platform to the first request, obtains the second request, and sends the second request to the first DNS server, which is a centralized DNS server.
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A
  • the first UPF network element queries FQDN-A according to Table 3, and determines that there is a DNAI list ( Including DNAI1), and further adding the DNAI list corresponding to FQDN-A to the first request, obtaining the second request, and sending the second request to the first DNS server, which is a centralized DNS server.
  • the second information includes the IP address corresponding to the first application platform.
  • the first UPF network element adds the IP address corresponding to the first application platform to the first request, obtains the second request, and sends the second request to the first DNS server, which is a centralized DNS server.
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A
  • the first UPF network element queries FQDN-A according to Table 6, and determines that there is an ECS option corresponding to FQDN-A. Include IP-1), and further add the ECS option corresponding to FQDN-A to the first request, obtain the second request, and send the second request to the first DNS server, which is a centralized DNS server.
  • the second information includes the IP address of the first local DNS server.
  • the first UPF network element modifies the target address of the first request to the IP address of the first local DNS server, obtains the second request, and sends the second request to the first DNS server, which is the first local DNS server .
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A
  • the first UPF network element queries FQDN-A according to Table 9 and determines that there is a local DNS server corresponding to FQDN-A IP-1, and further modify the target address of the first request to the local DNS server IP-1 corresponding to FQDN-A, obtain the second request, and send the second request to the local DNS server IP-1 corresponding to the local DNS server.
  • the SMF network element also sends first indication information to the first UPF network element, where the first indication information is used to indicate that the first UPF network element is receiving the first request from the terminal device and When the first request includes the first domain name, the second request is determined according to the second information, and the second request is sent to the first DNS server.
  • the first indication information may be sent at the same time as the second information, or may be sent separately from the second information.
  • the SMF network element selects the first UPF network element as the anchor point of the PDU session of the terminal device, the SMF sends an N4 session establishment request message to the first UPF.
  • the N4 session establishment request message needs to carry the translation table and the first Instructions.
  • the translation table includes the first domain name and the second information.
  • the first indication information may specifically include the following three possible forms:
  • the first possible form corresponding to the first possible form in step 610, the first indication information is used to indicate that the first UPF network element is receiving the first request from the terminal device and the first request includes the first domain name
  • the DNAI corresponding to the first application platform is added to the first request, the second request is obtained, and the second request is sent to the first DNS server, which is a centralized DNS server.
  • the second possible form corresponding to the second possible form in step 610, the first indication information is used to indicate that the first UPF network element is receiving the first request from the terminal device and the first request includes the first domain name At this time, the IP address corresponding to the first application platform is added to the first request, the second request is obtained, and the second request is sent to the first DNS server, which is a centralized DNS server.
  • the third possible form corresponding to the third possible form in step 610, the first indication information is used to indicate that the first UPF network element is receiving the first request from the terminal device and the first request includes the first domain name At this time, the target address of the first request is modified to the IP address of the first local DNS server, the second request is obtained, and the second request is sent to the first DNS server, which is the first local DNS server.
  • the first UPF network element sends fourth information to the SMF network element.
  • the fourth information includes the DNAI corresponding to the second application platform where the first application is located or the second application platform where the first application is located. At least one of the corresponding IP address and the first IP address.
  • the first IP address is the IP address of the server of the first application deployed on the second application platform.
  • the SMF network element selects ULCL or BP for the PDU session of the terminal device based on the fourth information, and the local PDU session anchor point, so that the DNS server returns the IP address of the application server closer to the terminal device to the terminal device, and then transfers the service flow Selectively route to the application platform where the application server is located.
  • the second application platform is one of the at least one first application platform. If the number of the first application platform is one, the second application platform is the same as the first application platform, and if the number of the first application platform is multiple, the second application platform is one of the multiple first application platforms.
  • the second information is represented by an ECS option list, and the ECS option list includes the IP address corresponding to the first application platform.
  • the ECS option list includes multiple IP addresses
  • the DNS server can determine the target ECS option and target application platform from the ECS option list according to the local policy.
  • the DNS server determines multiple application platforms based on the multiple IP addresses included in the ECS option list, and further based on the load conditions of multiple application platforms, the application platform with a lighter load is used as the target application platform, and The ECS option that includes the IP address corresponding to the target application platform is used as the target ECS option.
  • the DNS server sends the DNAI corresponding to the target application platform or the IP address corresponding to the target application platform to the first UPF network element. Among them, the target application platform is the second application platform.
  • the terminal device moves, for example, the terminal device enters the service area of another application platform from the service area of the current application platform, the first IP address previously requested by the terminal device is relative to the current location of the terminal device. It is no longer optimized, and the terminal device needs to refresh the DNS cache record, request the first domain name again, and update the first IP address.
  • the first UPF After the first UPF network element sends the second request to the first DNS server, the first UPF receives a response message from the first DNS server for the first request, and the response message includes the first IP address and the corresponding first domain name.
  • the response message may also include the DNAI corresponding to the second application platform where the first application is located or the IP address corresponding to the second application platform where the first application is located.
  • the first UPF saves the response message, and sends the fourth message to the SMF network element.
  • the fourth information includes at least one of the DNAI corresponding to the second application platform where the first application is located, or the IP address corresponding to the second application platform where the first application is located, and the first IP address.
  • the SMF network element when the terminal device moves, the SMF network element obtains the updated location information of the terminal device, and determines in at least one application platform based on the first information and the updated location information of the terminal device The third application platform; among them, the third application platform is different from the second application platform.
  • the SMF network element sends the first domain name and the updated second information to the first UPF network element, and the updated second information corresponds to the third application platform.
  • the first UPF network element sends a notification message to the SMF network element, where the notification message is used to instruct the SMF network element to notify the terminal device to send a third request, and the third request includes the first domain name.
  • the first user plane network element determines whether the TTL of the DNS cache record corresponding to the first domain name exceeds the preset time period, and if so, the first UPF network element sends the SMF The network element sends the notification message; otherwise, the first UPF network element may not send the notification message. Further, after the SMF network element receives the notification message, the SMF network element sends a Non-Access Stratum (NAS) message to the terminal device, and the NAS message includes the notification message. Therefore, the adoption of the above design can improve the accuracy of DNS cache record refresh, ensure user experience, and can optimize the IP address corresponding to the domain name that the terminal device accesses as the location of the terminal device changes.
  • NAS Non-Access Stratum
  • the SMF network element obtains the first information, determines the second information at least according to the location information of the UE and the first information, and sends the first domain name and the second information to the first UPF network element.
  • the first UPF network element receives the first request from the terminal device and the first request includes the first domain name
  • the first UPF network element determines the second request according to the second information, and sends the second request to the first DNS server, So that the first IP address corresponding to the first domain name obtained by the first DNS server.
  • the terminal device uses the first IP address to access the first domain name at the location indicated by the location information of the terminal device, the terminal device can access the local service nearby, can reduce the time delay of accessing the service, and can improve the communication efficiency.
  • the SMF network element sends the first domain name and the second information to the first UPF network element during the establishment of the PDU session of the terminal device.
  • the embodiment of the present application also provides a method for discovering applications.
  • the SMF network element determines third information according to the first information, and sends the first domain name and the third information to the first UPF network element in advance.
  • the SMF network element determines the second information according to the location information of the terminal device and the first information, and sends the first domain name and the second information to the first UPF network element.
  • the embodiment shown in FIG. 7 can reduce the transmission load on the N4 interface during the establishment of the PDU session. At this time, for the specific content of the third information and the second information, refer to the related description in the embodiment shown in FIG. 7.
  • the embodiment of the present application also provides a method for discovering applications.
  • the method is used to realize that the DNS server returns the IP address of the application server closer to the terminal device to the terminal device so that the terminal device can access the local device nearby. business.
  • the method includes:
  • Step 700 The SMF network element obtains the first information.
  • the first information includes the identification of the first application corresponding to the first domain name and the location information of at least one application platform where the first application is located; or, the first information includes the first domain name and the information of at least one application platform where the first application is located.
  • Location information or, the first information includes the first domain name, the identification of the first application corresponding to the first domain name, and the location information of at least one application platform on which the first application is located.
  • the SMF network element can adopt but not limited to the following possible designs to obtain the first information:
  • the SMF network element may locally configure the first information.
  • the SMF network element obtains the first information from other network elements.
  • an implementation method is that the SMF network element sends a request message to the AF network element or UDR network element through the NEF network element, and the AF network element or UDR network element sends a response message to the NEF network element, and the response message carries the first information.
  • the AF network element or the UDR network element stores the first information.
  • the SMF network element obtains the first information through a network management function network element (operation administration and maintenance, OAM).
  • part of the information in the first information may be stored in the SMF network element in a locally configured manner, and another part of the information in the first information may be obtained from other network elements.
  • the SMF network element may locally configure the identification of the first application corresponding to the first domain name, and the SMF network element obtains the location information of at least one application platform where the first application is located from the PCF network element or the NEF network element.
  • the element or NEF network element stores the location information of at least one application platform where the first application is located.
  • At least one application platform where the first application is located indicates that one or more application platforms exist, and the server of the first application is deployed on these application platforms.
  • the application platform here can refer to the MEC platform, also known as the management platform, or the application management platform.
  • the location information of the at least one application platform where the first application is located may be described as the location information of the at least one application platform where the server deploying the first application is located, which is not limited in this application.
  • the location information of the at least one application platform where the first application is located may include DNAIs respectively corresponding to the at least one application platform where the first application is located.
  • the SMF network element can obtain the corresponding relationship between the domain name, the identification of the application, and the location information of the at least one application platform where the application is located, as shown in Table 1. Show. It can be understood that the SMF network element obtains multiple pieces of first information.
  • Step 710 The SMF network element determines third information at least according to the first information.
  • the third information is used to obtain the first IP address corresponding to the first domain name.
  • the following describes the specific content included in the third information based on the different content included in the first information.
  • the first possible form if the first information further includes index information corresponding to at least one application platform where the first application is located, the location information of the at least one application platform where the first application is located may include at least one application where the first application is located DNAIs respectively corresponding to the platforms, and the third information includes the corresponding relationship between the DNAIs respectively corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located.
  • the third information may be represented by the corresponding relationship between index and DNAI.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the index information respectively corresponding to at least one application platform where the first application is located includes index (Index)-1 (corresponding to MEC-1) and Index-1 (corresponding to MEC-2).
  • the SMF network element regards Index-1 corresponding to DNAI1, and Index-2 corresponding to DNAI2 as the third information.
  • a second possible form if the first information further includes index information corresponding to at least one application platform where the first application is located and an IP address corresponding to at least one application platform where the first application is located, the third information includes the first application Correspondence between IP addresses corresponding to at least one application platform where the first application is located and index information corresponding to at least one application platform where the first application is located.
  • the third information may be represented by the corresponding relationship between index and ECS option.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the index information corresponding to at least one application platform where the first application is located includes Index-1 (corresponding to MEC-1) and Index-1 (corresponding to MEC-2), and at least one application where the first application is located
  • the IP addresses corresponding to the platforms include IP-1 (corresponding to DNAI1) and IP-2 (corresponding to DNAI2).
  • the SMF network element regards Index-1 corresponding to IP-1, and Index-2 corresponding to IP-2 as the third information.
  • a third possible form if the first information further includes index information corresponding to at least one application platform on which the first application is located and an IP address of a local DNS server corresponding to at least one application platform on which the first application is located, then the third The information includes the correspondence between the IP addresses of the local DNS servers respectively corresponding to the at least one application platform where the first application is located and the index information respectively corresponding to the at least one application platform where the first application is located.
  • the third information may be represented by the correspondence relationship between index and local DNS server IP.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the index information corresponding to at least one application platform where the first application is located includes index-1 (corresponding to MEC-1) and Index-1 (corresponding to MEC-2), and at least one of the first application platforms is located
  • the IP addresses of the local DNS servers corresponding to the application platforms include local DNS server IP-1 (corresponding to DNAI1) and local DNS server IP-2 (corresponding to DNAI2).
  • the SMF network element regards Index-1 corresponding to local DNS server IP-1, and Index-2 corresponding to local DNS server IP-2 as the third information.
  • Step 720 The SMF network element sends the first domain name and third information to the first UPF network element.
  • the SMF network element can send the first domain name and the third information to multiple UPF network elements, where the multiple UPF network elements include the first UPF network element.
  • the SMF network element sends a translation table to the first UPF network element, and the translation table includes the first domain name and third information.
  • Step 730 The SMF network element determines second information at least according to the first information and the location information of the terminal device.
  • the second information is used to obtain the first IP address corresponding to the first domain name.
  • An implementation method for the SMF network element to obtain the location information of the terminal device is that the SMF network element can obtain the location information of the terminal device from other network elements.
  • the SMF network element can obtain the TAI of the terminal device from the AMF network element.
  • the SMF network element can also request the TAI of the terminal device from the AMF network element.
  • the AMF network element can provide the SMF network element with the current latest TAI of the terminal device, so that the SMF network element can determine the location information of the terminal device based on the current latest TAI of the terminal device.
  • the SMF network element determines the first application platform in at least one application platform where the first application is located according to the first information and the location information of the terminal device.
  • the SMF network element may determine, from at least one application platform where the first application is located, at least one application platform that is closer to the terminal device, that is, the first application platform, based on the first information and the location information of the terminal device.
  • the first application platform deploys the server of the first application, and the number of the first application platform may be one or more.
  • the first application platform is the application platform where the server of the first application is located when the terminal device accesses the server of the first application through the optimized path at the current location.
  • the terminal device is deployed to the first application platform.
  • the routing path of the data message is the optimal path under the current network topology condition. If the terminal device accesses the server of the first application through the optimized path at the current location, the number of application platforms where the server of the first application is located is multiple, then the number of the first application platform is multiple.
  • the SMF network element may also determine the first application platform in at least one application platform where the first application is located in combination with other information, such as load information of the application platform, network topology information, etc., which is not limited in this application.
  • the SMF network element may determine multiple application platforms in at least one application platform where the first application is located according to the first information and the location information of the terminal device, and the SMF network element may further combine the load information corresponding to the multiple application platforms to determine The application platform with the lowest load is regarded as the first application platform.
  • the SMF network element may use the first information and the location information of the terminal device (for example, TAI ), determining at least one first application platform from at least one application platform where the first application is located. Specifically, there may be a mapping relationship or a correspondence between the location information of the terminal device and the DNAI corresponding to the at least one application platform where the first application is located.
  • the SMF network element may obtain information from at least one of the at least one application platform where the first application is located according to the location information of the terminal device. At least one first application platform is determined among the application platforms.
  • the following describes the specific content included in the second information based on the different content included in the first information and the third information.
  • the first possible form if the first information further includes index information corresponding to at least one application platform where the first application is located, the location information of the at least one application platform where the first application is located may include at least one application where the first application is located.
  • DNAI corresponding to the platforms and the third information includes the corresponding relationship between the DNAI corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the second information includes the first application platform Index information corresponding to the corresponding DNAI.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Since there is a corresponding relationship between the application platform and the DNAI corresponding to the application platform, and there is a corresponding relationship between the DNAI corresponding to the application platform and the index relationship corresponding to the application platform, after the SMF network element determines the first application platform, it can get the corresponding relationship of the first application platform. DNAI, and further determine the index information corresponding to the DNAI corresponding to the first application platform as the second information. It should be understood that the DNAI corresponding to the first application platform may be represented by a DNAI list. The DNAI list contains at least one DNAI. If the number of the first application platform is multiple, the DNAI list includes multiple DNAIs, and the index information corresponding to the DNAI corresponding to the first application platform includes indexes respectively corresponding to the multiple DNAIs.
  • the DNAI corresponding to an application platform can represent the location information of the application platform. Therefore, the SMF network element sends the index information corresponding to the DNAI corresponding to the first application platform to the first UPF network element as the second information, and the first UPF network element can use the index information corresponding to the DNAI corresponding to the first application platform and the third The information determines the DNAI corresponding to the first application platform, and adds the DNAI corresponding to the first application platform to the first request, obtains the second request, and sends the second request to the first DNS server, so that the first DNS server according to the first application
  • the location information of the platform determines the first IP address corresponding to the first domain name.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the index information respectively corresponding to at least one application platform where the first application is located includes Index-1 (corresponding to MEC-1) and Index-1 (corresponding to MEC-2).
  • the third information includes that Index-1 corresponds to DNAI1, and Index-2 corresponds to DNAI2.
  • the SMF network element may determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and determine Index-1 as the second information in combination with the third information.
  • the second possible form if the first information further includes index information corresponding to at least one application platform where the first application is located and an IP address corresponding to at least one application platform where the first application is located, the third information includes the first application Correspondence between the IP address corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the second information includes the index information corresponding to the IP address corresponding to the first application platform.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Further, since the application platform has a corresponding relationship with the IP address corresponding to the application platform, and the application platform corresponds to There is a corresponding relationship between the index relationship between DNAI and the application platform. Therefore, after determining the first application platform, the SMF network element determines the IP address corresponding to the first application platform according to the respective IP addresses of at least one application platform where the first application is located. The index information corresponding to the IP address corresponding to the first application platform is used as the second information.
  • the IP address corresponding to the first application platform can be represented by ECS option list.
  • the ECS option list contains at least one ECS option.
  • the ECS option list includes multiple ECS options, and each ECS option includes an IP address.
  • the IP address contained in the ECS option is the IP address corresponding to the application platform.
  • the description of can refer to the previous description, and the repetition will not be repeated.
  • the index information corresponding to the IP address corresponding to the first application platform includes indexes corresponding to multiple ECS options, respectively.
  • the SMF network element sends the index information corresponding to the IP address corresponding to the first application platform as the second information to the first UPF network element.
  • the first UPF network element may determine the IP address corresponding to the first application platform according to the index information corresponding to the IP address corresponding to the first application platform and the third information, and add the IP address corresponding to the first application platform to the first request to obtain the first request.
  • Second request and send a second request to the first DNS server, so that the first DNS server determines the first IP address corresponding to the first domain name according to the location information of the first application platform.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the IP addresses corresponding to at least one application platform where the first application is located include IP-1 (corresponding to DNAI1) and IP-2 (corresponding to DNAI2), and the third information includes Index-1 corresponding to IP-1, Index-2 corresponds to IP-2.
  • the SMF network element can determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and determine IP-1 according to DNAI1, and use Index-1 as the second information in combination with the third information.
  • a third possible form if the first information further includes index information corresponding to at least one application platform where the first application is located and the IP address of a local DNS server respectively corresponding to the at least one application platform where the first application is located, the third information Including the correspondence between the IP addresses of the local DNS servers respectively corresponding to the at least one application platform where the first application is located and the index information respectively corresponding to the at least one application platform where the first application is located, the second information includes the IP of the first local DNS server For index information corresponding to the address, the first local DNS server provides services for the first application platform.
  • the SMF network element determines the first application platform in at least one application platform according to the first information and the location information of the terminal device. Further, since the application platform has a corresponding relationship with the IP address of the local DNS server corresponding to the application platform, and There is a corresponding relationship between the IP address of the local DNS server corresponding to the application platform and the index relationship corresponding to the application platform. Therefore, after the first application platform is determined, the SMF network element corresponds to the local DNS server respectively corresponding to at least one application platform where the first application is located. The IP address of determines the IP address of the first local DNS server, and the index information corresponding to the IP address of the first local DNS server is used as the second information.
  • the first application platform can be understood as a local application platform or an MEC platform, and the local DNS server serving the first application platform is called the first local DNS server.
  • the local DNS server serving the first application platform is called the first local DNS server.
  • at least one application platform where the first application is located includes multiple local application platforms or multiple MEC platforms, there may be multiple local DNS servers that serve the local application platform or the MEC platform. It can be understood that if the number of first application platforms is multiple, and the local DNS servers corresponding to the multiple first application platforms are also multiple, in this case, the SMF network element can select a local DNS based on the local policy.
  • the server serves as the first local DNS server.
  • the SMF network element uses the local DNS server with a lighter load as the first local DNS server based on the load condition of each local DNS server among the multiple local DNS servers. In another implementation manner, the SMF network element uses the local DNS server with more supported domain name query lists as the first local DNS server based on the domain name query list supported by each of the multiple local DNS servers.
  • the SMF network element sends the index information corresponding to the IP address of the first local DNS server as the second information to the first UPF network element, and the first UPF network element can use the index information corresponding to the IP address of the first local DNS server and The third information determines the IP address of the first local DNS server.
  • the first UPF network element modifies the target address of the first request to the IP address of the first local DNS server, obtains the second request, and sends the second request to the first DNS server, the first DNS server is the first local DNS server.
  • the first information includes the first domain name FQDN-A, the identification APP ID-1 of the first application corresponding to the first domain name, and the location information of at least one application platform where the first application is located includes DNAI1 (corresponding to MEC-1) and DNAI2 (Corresponding to MEC-2), the IP addresses of the local DNS servers respectively corresponding to at least one application platform where the first application is located include local DNS server IP-1 (corresponding to DNAI1) and local DNS server IP-2 (corresponding to DNAI2).
  • the third information includes that Index-1 corresponds to local DNS server IP-1, and Index-2 corresponds to local DNS server IP-2.
  • the SMF network element can determine DNAI1 from DNAI1 and DNAI2 according to the location information of the terminal device and the first information, and determine the local DNS server IP-1 according to DNAI1, and use Index-1 as the second information in combination with the third information.
  • the SMF network element obtains the corresponding relationship between the domain name, the identification of the application, and the location information of at least one application platform where the application is located.
  • the correspondence between the domain name, the application identifier, and the location information of at least one application platform where the application is located can be understood as the identifiers of all applications deployed in the entire network, the domain names corresponding to each of all applications, and each of all applications.
  • the corresponding relationship of the location information of at least one application platform where each application is located (hereinafter referred to as the first type of corresponding relationship).
  • the SMF network element For the method for the SMF network element to obtain the corresponding relationship of the first type, reference may be made to step 700, and the repetition is not repeated here.
  • the following three possible designs can be further expanded:
  • the SMF network element determines the domain name and at least one application platform where the application corresponding to the domain name is based on the first type of correspondence and the correspondence between the index information of the application platform and the location information of the application platform.
  • the SMF network element sends the first corresponding relationship to the first UPF network element.
  • the SMF network element obtains the identities of multiple applications subscribed by the terminal device.
  • the identities of multiple applications signed by the terminal device can be obtained in the following manner: in the process of initiating the establishment of a PDU session by the terminal device, after the SMF network element calls the PCF network element to request the policy information related to the PDU session from the PCF network element, The PCF network element invokes the service operation request of the UDR, and obtains information related to multiple applications subscribed by the terminal device from the UDR.
  • the information related to multiple applications subscribed by the terminal device includes the identities of multiple applications subscribed by the terminal device.
  • the SMF network element determines the DNAI list corresponding to each of the multiple domain names according to the location information of the terminal device, multiple domain names, and the corresponding relationship of the first type, where multiple domain names refer to the contract with the terminal device The domain name corresponding to each of the multiple applications.
  • the SMF network element obtains the index corresponding to each DNAI in the DNAI list corresponding to the multiple domain names according to the first correspondence and the DNAI list corresponding to each domain name in the multiple domain names.
  • the index corresponding to each DNAI is sent to the first UPF network element.
  • the SMF network element determines Table 10 according to the correspondence between Table 1 and the index information of the application platform and the location information of the application platform, and sends Table 10 to the first UPF network element.
  • multiple application-related information subscribed by the UE includes APP-1 and APP-2.
  • APP-1 corresponds to FQDN-A
  • APP-2 corresponds to FQDN-B.
  • the SMF network element determines DNAI1 from DNAI1 and DNAI2 corresponding to FQDN-A according to the location information (TAI) of the UE and Table 1, and determines DNAI2 and DNAI3 from DNAI2 and DNAI3 corresponding to FQDN-B, which means that each domain name corresponds to each domain name.
  • the DNAI list is shown in Table 11.
  • the SMF network element obtains Table 12 according to Table 10 and Table 11. Further, the SMF network element obtains Table 13 according to Table 12, and sends Table 13 to the first UPF network element.
  • the SMF network element corresponds to the first type of correspondence and the correspondence between the index information of the application platform and the location information of the application platform, and the correspondence between the IP address of the application platform and the location information of the application platform. Relationship, determine the correspondence relationship between the domain name, the IP address of at least one application platform where the application corresponding to the domain name is located, and the index information of at least one application platform where the application corresponding to the domain name is located (hereinafter referred to as the second correspondence relationship). The two correspondences are sent to the first UPF network element.
  • the SMF network element obtains the identities of multiple applications subscribed by the terminal device.
  • the method for the SMF network element to obtain the identities of the multiple applications subscribed by the terminal device can refer to the first possible design, which will not be repeated here.
  • the SMF network element determines the DNAI list corresponding to each of the multiple domain names according to the location information of the terminal device, multiple domain names, and the corresponding relationship of the first type, where multiple domain names refer to the contract with the terminal device The domain name corresponding to each of the multiple applications.
  • the SMF network element further obtains the index information corresponding to each ECS option in the ECS option list corresponding to multiple domain names according to the correspondence between the IP address of the application platform and the DNAI of the application platform and the second correspondence, and corresponds to the multiple domain names.
  • the index information corresponding to each ECS option in the ECS option list is sent to the first UPF network element.
  • the SMF network element determines Table 14 according to Table 1 and the correspondence between the IP address of the application platform and the DNAI of the application platform (as shown in Table 13), and further according to the application platform The corresponding relationship between the index information and the location information of the application platform is determined in Table 15, and Table 16 is determined according to Table 15, and Table 16 is sent to the first UPF network element.
  • multiple application-related information subscribed by the UE includes APP-1 and APP-2. Among them, APP-1 corresponds to FQDN-A, and APP-2 corresponds to FQDN-B.
  • the SMF network element determines DNAI1 from DNAI1 and DNAI2 corresponding to FQDN-A according to the location information of the UE and Table 1, and determines DNAI2 and DNAI3 from DNAI2 and DNAI3 corresponding to FQDN-B, as shown in Table 11.
  • the SMF network element obtains Table 17 according to Table 15 and Table 11. Further, the SMF network element obtains Table 18 according to Table 17, and sends Table 18 to the first UPF network element.
  • the SMF network element uses the first type of correspondence and the correspondence between the index information of the application platform and the location information of the application platform, the IP address of the local DNS server of the application platform, and the application platform’s corresponding relationship.
  • the SMF network element sends the third correspondence to the first UPF network element.
  • the SMF network element obtains the identities of multiple applications subscribed by the terminal device.
  • the method for the SMF network element to obtain the identities of the multiple applications subscribed by the terminal device can refer to the first possible design, which will not be repeated here.
  • the SMF network element determines the DNAI list corresponding to each of the multiple domain names according to the location information of the terminal device, multiple domain names, and the corresponding relationship of the first type, where multiple domain names refer to the contract with the terminal device The domain name corresponding to each of the multiple applications.
  • the SMF network element further obtains the index information corresponding to the IP address of the first local DNS server corresponding to the multiple domain names according to the correspondence between the IP address of the local DNS server of the application platform and the location information of the application platform and the third correspondence.
  • the index information corresponding to the IP address of the first local DNS server corresponding to each domain name is sent to the first UPF network element.
  • the SMF network element determines Table 20 according to Table 1 and the correspondence between the IP address of the local DNS server of the application platform and the location information of the application platform (as shown in Table 19). Furthermore, according to the corresponding relationship between the index information of the application platform and the location information of the application platform, the table 21 is determined, the table 22 is determined according to the table 21, and the table 22 is sent to the first UPF network element.
  • the information related to the application subscribed by the UE includes APP-1 and APP-2. Among them, APP-1 corresponds to FQDN-A, and APP-2 corresponds to FQDN-B.
  • the SMF network element determines DNAI1 from DNAI1 and DNAI2 corresponding to FQDN-A according to the location information of the UE and Table 1, and determines DNAI2 and DNAI3 from DNAI2 and DNAI3 corresponding to FQDN-B, as shown in Table 11.
  • the SMF network element obtains Table 23 according to Table 21 and Table 11. Further, the SMF network element obtains Table 24 according to Table 23, and sends the table 24 to the first UPF network element.
  • Step 740 The SMF network element sends the first domain name and second information to the first UPF network element.
  • the foregoing steps 730 to 740 may be executed during the establishment of the PDN session initiated by the terminal device.
  • the SMF network element has selected the first UPF network element as the anchor point of the PDU session of the terminal device according to parameters such as DNN and S-NSSAI. Therefore, the SMF network element sends the first domain name to the first UPF network element And the second information, you can choose not to send the first domain name and the second information to other UPF network elements.
  • the SMF network element sends an N4 session establishment request message to the first UPF network element, and the N4 session establishment request message needs to carry a translation table.
  • the translation table includes the first domain name and the second information.
  • Step 750 The first UPF network element receives a first request from the terminal device, where the first request includes the first domain name.
  • the first UPF network element queries whether to save the second information corresponding to the first domain name according to the first domain name, that is, the first UPF network element has received the second information corresponding to the first domain name from the SMF network element, if If it exists, perform step 640; otherwise, the first UPF network element forwards the first request to the DNS server or DNS proxy indicated by the target address of the first request.
  • Step 760 The first UPF network element determines the second request based on the second information and the third information, and sends the second request to the first DNS server.
  • the second request is used to obtain the first domain name correspondence when the terminal device is located at the first location.
  • the first IP address is used to obtain the first domain name correspondence when the terminal device is located at the first location.
  • the first IP address is used to obtain the location information of the terminal device.
  • the first UPF network element determines the second request according to the second information and the third information, and sends the second request to the first DNS server may also include the following three conditions:
  • the third information includes the corresponding relationship between the DNAI corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the second information includes the DNAI corresponding to the first application platform. Corresponding index information.
  • the first UPF network element corresponds to the index information corresponding to the DNAI corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the index information corresponding to the DNAI corresponding to the first application platform.
  • Determine the DNAI corresponding to the first application platform add the DNAI corresponding to the first application platform to the first request, obtain the second request, and send the second request to the first DNS server, which is a centralized DNS server.
  • the third information corresponding to FQDN-A includes Index-1 corresponding to DNAI1 and Index-2 corresponding to DNAI2.
  • the second information corresponding to FQDN-A includes Index-1.
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A, then the first UPF network element queries FQDN-A, determines that there are second information and third information corresponding to FQDN-A, and Further determine DNAI1 according to the second and third information corresponding to FQDN-A, add DNAI1 to the first request, obtain the second request, and send the second request to the first DNS server, which is a centralized DNS server .
  • the third information includes the corresponding relationship between the IP address corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the second information includes the corresponding relationship between the first application platform and the corresponding IP address. Index information corresponding to the IP address.
  • the first UPF network element corresponds to the index information corresponding to the at least one application platform where the first application is located and the corresponding index information corresponding to the at least one application platform where the first application is located, and the index corresponding to the IP address corresponding to the first application platform.
  • Information determine the IP address corresponding to the first application platform, add the IP address corresponding to the first application platform to the first request, obtain the second request, and send the second request to the first DNS server, the first DNS server is centralized DNS server.
  • the third information corresponding to FQDN-A includes Index-1 corresponding to IP-1 and Index-2 corresponding to IP-2.
  • the second information corresponding to FQDN-A includes Index-1.
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A, then the first UPF network element queries FQDN-A, and determines that there is second information corresponding to FQDN-A and corresponding to FQDN-A And further determine IP-1 according to the second information corresponding to FQDN-A and the third information corresponding to FQDN-A, add IP-1 to the first request, obtain the second request, and add the second The request is sent to the first DNS server, which is a centralized DNS server.
  • the third information includes the correspondence between the IP address of the local DNS server corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the second information includes the first Index information corresponding to the IP address of the local DNS server, and the first local DNS server provides services for the first application platform.
  • the first UPF network element may be based on the correspondence between the IP address of the local DNS server corresponding to the at least one application platform where the first application is located and the index information corresponding to the at least one application platform where the first application is located, and the value of the first local DNS server.
  • the index information corresponding to the IP address determines the IP address of the first local DNS server, modifies the target address of the first request to the IP address of the first local DNS server, obtains the second request, and sends the second request to the first DNS server ,
  • the first DNS server is the first local DNS server.
  • the third information corresponding to FQDN-A includes Index-1 corresponding to local DNS server IP-1, and Index-2 corresponding to local DNS server IP-2.
  • the second information corresponding to FQDN-A includes Index-1.
  • the first UPF network element receives the first request from the UE, and the first request includes FQDN-A, then the first UPF network element queries FQDN-A, and determines that there is second information corresponding to FQDN-A and corresponding to FQDN-A And further determine the local DNS server IP-1 according to the second information corresponding to FQDN-A and the third information corresponding to FQDN-A, and modify the target address of the first request to correspond to FQDN-A local DNS server IP-1, obtains the second request, and sends the second request to the local DNS server corresponding to local DNS server IP-1.
  • the SMF network element also sends first indication information to the first UPF network element, where the first indication information is used to indicate that the first UPF network element is receiving the first request from the terminal device and When the first request includes the first domain name, the second request is determined according to the second information and the third information, and the second request is sent to the first DNS server.
  • the first indication information may be sent at the same time as the second information, or may be sent separately from the second information.
  • the SMF network element selects the first UPF network element as the anchor point of the PDU session of the terminal device, the SMF sends an N4 session establishment request message to the first UPF.
  • the N4 session establishment request message needs to carry the translation table and the first Instructions.
  • the translation table includes the first domain name and the second information.
  • the first UPF network element sends fourth information to the SMF network element.
  • the fourth information includes the DNAI corresponding to the second application platform where the first application is located or the second application platform where the first application is located. At least one of the corresponding IP address and the first IP address.
  • the first IP address is the IP address of the server of the first application deployed on the second application platform.
  • the SMF network element selects ULCL or BP for the PDU session of the terminal device based on the fourth information, and the local PDU session anchor point, so that the DNS server returns the IP address of the application server closer to the terminal device to the terminal device, and then transfers the service flow Selectively route to the application platform where the application server is located.
  • the second application platform is one of the at least one first application platform. If the number of the first application platform is one, the second application platform is the same as the first application platform, and if the number of the first application platform is multiple, the second application platform is one of the multiple first application platforms.
  • the first UPF network element determines the IP address corresponding to the first application platform according to the second information and the third information, and the IP address corresponding to the first application platform is represented by the ECS option list. If the number of the first application platform is more If the ECS option list includes multiple IP addresses, the DNS server can determine the target ECS option and target application platform from the ECS option list according to the local policy. In one implementation, the DNS server determines multiple application platforms based on the multiple IP addresses included in the ECS option list, and further based on the load conditions of multiple application platforms, the application platform with a lighter load is used as the target application platform, and The ECS option that includes the IP address corresponding to the target application platform is used as the target ECS option. The DNS server sends the DNAI corresponding to the target application platform or the IP address corresponding to the target application platform to the first UPF network element. Among them, the target application platform is the second application platform.
  • the terminal device moves, for example, the terminal device enters the service area of another application platform from the service area of the current application platform, the first IP address previously requested by the terminal device is relative to the current location of the terminal device. It is no longer optimized, and the terminal device needs to refresh the DNS cache record, request the first domain name again, and update the first IP address.
  • the first UPF After the first UPF network element sends the second request to the first DNS server, the first UPF receives a response message from the first DNS server for the first request, and the response message includes the first IP address and the corresponding first domain name.
  • the response message may also include the DNAI corresponding to the second application platform where the first application is located or the IP address corresponding to the second application platform where the first application is located.
  • the first UPF saves the response message, and sends the fourth message to the SMF network element.
  • the fourth information includes at least one of DNAI corresponding to the second application platform where the first application is located, or an IP address corresponding to the second application platform where the first application is located, and the first IP address.
  • the SMF network element when the terminal device moves, the SMF network element obtains the updated location information of the terminal device, and determines in at least one application platform based on the first information and the updated location information of the terminal device The third application platform; among them, the third application platform is different from the second application platform.
  • the SMF network element sends the first domain name and the updated second information to the first UPF network element, and the updated second information corresponds to the third application platform.
  • the first UPF network element sends a notification message to the SMF network element, where the notification message is used to instruct the SMF network element to notify the terminal device to send a third request, and the third request includes the first domain name.
  • the first user plane network element determines whether the TTL of the DNS cache record corresponding to the first domain name exceeds the preset time period, and if so, the first UPF network element sends the SMF The network element sends the notification message; otherwise, the first UPF network element may not send the notification message. Further, after the SMF network element receives the notification message, the SMF network element sends a Non-Access Stratum (NAS) message to the terminal device, and the NAS message includes the notification message. Therefore, the adoption of the above design can improve the accuracy of DNS cache record refresh, ensure user experience, and can optimize the IP address corresponding to the domain name that the terminal device accesses as the location of the terminal device changes.
  • NAS Non-Access Stratum
  • the SMF network element obtains the first information, determines the third information according to the first information, and sends the first domain name and the third information to the first UPF network element. Further, the SMF network element also determines the second information at least according to the location information of the UE and the first information, and sends the first domain name and the second information to the first UPF network element.
  • the first UPF network element receives the first request from the terminal device and the first request includes the first domain name
  • the first UPF network element determines the second request according to the second information and the third information, and sends it to the first DNS server
  • the second request is for the first IP address corresponding to the first domain name obtained by the first DNS server.
  • the terminal device uses the first IP address to access the first domain name at the location indicated by the location information of the terminal device, the terminal device can access the local service nearby, can reduce the time delay of accessing the service, and can improve the communication efficiency.
  • FIG. 6 The embodiment shown in FIG. 6 will be described in detail below in conjunction with specific embodiments.
  • FIG. 8 is one of the specific flowcharts of the UE requesting the IP address corresponding to the domain name
  • FIG. 14 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. .
  • the corresponding relationship between the DNAI corresponding to the application platform and the IP address corresponding to the application platform is configured on the SMF network element, as shown in Table 4.
  • the AF network element stores the correspondence between APP ID, FQDN, and the DNAI corresponding to the application platform in the UDR, as shown in Table 1.
  • S801 The UE initiates a PDU session establishment process.
  • the UE carries the PDU session identifier, S-NSSAI and DNN and other parameters and sends it to the AMF network element.
  • the AMF network element selects the SMF network element according to the S-NSSAI and DNN, and sends parameters such as the AMF network element's identity, the UE's permanent identity, the location information of the UE, the PDU session identity, and the S-NSSAI and DNN to the SMF network element.
  • the location information of the UE includes the TAI of the UE.
  • S802 The SMF sends a service-oriented operation policy establishment control request (Npcf_SMPolicy Control_Create Request) to the PCF.
  • the request is used to obtain policy information related to the PDU session from the PCF.
  • the PCF sends a servicing operation request (Nudr_DM_Query) to the UDR.
  • the request is used to obtain information and Table 1 related to multiple applications subscribed by the UE from the UDR.
  • the UDR sends a service operation response (Nudr_DM_Response) to the PCF.
  • the response includes information related to multiple applications subscribed by the UE and Table 1, and the information related to multiple applications subscribed by the UE includes the identifiers of multiple applications subscribed by the UE. .
  • the PCF generates a policy and charging control rule (Policy and Charging Control rule, PCC rule), and sends a control response (Npcf_SMPolicyControl_Create Response) to the SMF through the service-oriented operation policy establishment control response (Npcf_SMPolicyControl_Create Response), and the SMF saves the PCC rule.
  • Policy and Charging Control rule Policy and Charging Control rule
  • PCC rule includes the identities of multiple applications subscribed by the UE and Table 1.
  • Table 1 is configured locally on the SMF, Table 1 does not need to be included in the foregoing S802 to S805.
  • S806 The SMF network element determines the ECS option list corresponding to multiple domain names.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 2, and according to the DNAI list corresponding to each domain name and Table 4. Obtain Table 5, and further determine the ECS option list corresponding to multiple domain names according to Table 5, as shown in Table 6.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the DNAI list includes at least one DNAI
  • the ECS option list includes ECS options respectively corresponding to the at least one DNAI.
  • Each ECS option includes an IP address.
  • the IP address contained in the ECS option is the IP address corresponding to the application platform. For the description of the IP address, please refer to the previous description, and the repetition will not be repeated.
  • S807 The SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes the ECS option list corresponding to multiple domain names, and the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF adds the ECS option list corresponding to the domain name to the first DNS request, obtain the second DNS request, and send the second DNS request to the centralized DNS server.
  • SMF selects UPF as the anchor point of the PDU session according to parameters such as S-NSSAI and DNN.
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that the first DNS query request carries the ECS option list corresponding to the FQDN.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If it does, determine the ECS option list corresponding to the FQDN in the translation table.
  • the centralized DNS server here may be a centralized DNS server deployed by an operator.
  • the centralized DNS server sends a DNS response message to the UPF.
  • the DNS response message carries the IP address corresponding to the FQDN, the TTL of the IP address and the target ECS option.
  • the centralized DNS server determines the application platform that the IP address in the ECS option points to, and further determines the IP address of the server deployed on the application platform as the IP address corresponding to the FQDN, and The server supports the FQDN.
  • the ECS option is the target ECS option.
  • the centralized DNS server can select the target ECS option from multiple ECS options, and further determine the IP address of the server deployed on the application platform to which the target ECS option points, as the corresponding FQDN IP address, and the server supports the FQDN.
  • the SMF network element selects the local PSA network element and ULCL or BP for the PDU session.
  • the SMF network element determines the target DNAI according to the target ECS option, and selects the local PSA network element for the PDU session according to the target DNAI. Furthermore, the SMF also selects ULCL or BP for the PDU session according to the target DNAI to achieve local offloading and optimize services. The access path improves communication efficiency.
  • the UPF sends a DNS response message to the UE, and the DNS response message carries the IP address corresponding to the FQDN.
  • FIG. 9 is the second specific flowchart of the UE requesting the IP address corresponding to the domain name
  • FIG. 14 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. 9 .
  • the AF network element stores the correspondence between APP ID, FQDN, and the DNAI corresponding to the application platform in the UDR, as shown in Table 1.
  • S901 to S905 please refer to S801 to S805 for details, and the repetition will not be repeated.
  • S906 The SMF network element determines the DNAI lists corresponding to multiple domain names.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 2, and Table 3 is obtained according to Table 2.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the DNAI list includes at least one DNAI.
  • the SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes the DNAI list corresponding to multiple domain names, and the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF adds the DNAI list corresponding to the domain name to the first DNS request. , Obtain the second DNS request, and send the second DNS request to the centralized DNS server.
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that the first DNS query request carries the DNAI list corresponding to the FQDN.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If it does, determine the DNAI list corresponding to the FQDN in the translation table.
  • S910 The UPF sends a second DNS query request to the centralized DNS server.
  • the centralized DNS server here may be a centralized DNS server deployed by an operator.
  • the centralized DNS server sends a DNS response message to the UPF.
  • the DNS response message carries the IP address corresponding to the FQDN and the TTL and target DNAI of the IP address.
  • the centralized DNS server determines the application platform that the DNAI points to, and further determines the IP address of the server deployed on the application platform as the IP address corresponding to the FQDN, and the server supports the FQDN. This DNAI is the target DNAI.
  • the centralized DNS server can select the target DNAI from the multiple DNAIs, and further determine the IP address of the server deployed on the application platform to which the target DNAI points, as the IP address corresponding to the FQDN, and The server supports this FQDN.
  • the SMF network element selects a local PSA network element and selects ULCL or BP for the PDU session.
  • the SMF network element selects a local PSA network element for the PDU session according to the target DNAI. Further, the SMF also selects ULCL or BP for the PDU session according to the target DNAI to achieve local offloading, optimize the service access path, and improve communication efficiency.
  • the UPF sends a DNS response message to the UE, and the DNS response message carries the IP address corresponding to the FQDN.
  • FIG. 10 is the third specific flowchart of the UE requesting the IP address corresponding to the domain name
  • FIG. 14 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. .
  • the corresponding relationship between the DNAI corresponding to the application platform and the IP address of the local DNS server corresponding to the application platform is configured on the SMF network element, as shown in Table 7.
  • the AF network element stores the correspondence between APP ID, FQDN, and the DNAI corresponding to the application platform in the UDR, as shown in Table 1.
  • the SMF network element determines the IP addresses of the first local DNS servers respectively corresponding to the multiple domain names.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 2, and according to the DNAI list corresponding to each domain name and Table 7, to obtain Table 8, and further determine the number according to Table 8.
  • Each domain name corresponds to the IP address of the first local DNS server, as shown in Table 9.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the DNAI list includes at least one DNAI.
  • the SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes the IP addresses of the local DNS servers corresponding to multiple domain names.
  • the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF will modify the target address of the first DNS request.
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that there is a first local DNS server corresponding to the FQDN carried in the first DNS query request.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If it does, determine the first local DNS server corresponding to the FQDN in the translation table.
  • S1010 The UPF sends a second DNS query request to the first local DNS server corresponding to the FQDN.
  • UPF modifies the target address of the first DNS request to the IP address of the first local DNS server corresponding to the FQDN, and obtains the second DNS request.
  • the first local DNS server corresponding to the FQDN sends a DNS response message to the UPF.
  • the DNS response message carries the IP address corresponding to the FQDN and the TTL of the IP address.
  • the UPF determines the DNAI (referred to as the target DNAI) of the application platform where the server pointed to by the IP address is located according to the IP address corresponding to the FQDN carried in the DNS response message.
  • the corresponding relationship between the IP address space (or IP address segment) and the DNAI of the application platform corresponding to the IP address space is locally configured on the UPF or obtained from other network elements.
  • the UPF can obtain the above configuration content through AF.
  • the UPF obtains the IP address corresponding to the FQDN, it can determine the address space (or IP address segment) where the IP address is located, and further, determine the DNAI of the application platform corresponding to the address space (or IP address segment).
  • the SMF network element selects a local PSA network element and selects ULCL or BP for the PDU session.
  • the SMF network element selects a local PSA network element for the PDU session according to the target DNAI. Further, the SMF also selects ULCL or BP for the PDU session according to the target DNAI to achieve local offloading, optimize the service access path, and improve communication efficiency.
  • the UPF sends a DNS response message to the UE, and the DNS response message carries the IP address corresponding to the FQDN.
  • FIG. 7 The embodiment shown in FIG. 7 will be described in detail below in conjunction with specific embodiments.
  • FIG. 11 is the fourth specific flowchart of the UE requesting the IP address corresponding to the domain name
  • FIG. 14 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. 11 .
  • the corresponding relationship between the DNAI corresponding to the application platform and the IP address corresponding to the application platform is configured on the SMF network element, as shown in Table 13, and the corresponding relationship between the APP ID, FQDN, and the DNAI corresponding to the application platform is shown in Table 1.
  • the SMF network element determines the first correspondence.
  • the first correspondence is a domain name, an index of at least one application platform where an application corresponding to the domain name is located, and an IP address corresponding to the application platform corresponding to the domain name.
  • the SMF network element determines the first corresponding relationship according to Table 1, Table 13 and the corresponding relationship between the DNAI corresponding to the application platform and the index of the application platform, as shown in Table 16.
  • S1102 The SMF network element sends a translation table to the UPF.
  • the translation table includes the first corresponding relationship.
  • S1103 The UE initiates a PDU session establishment process.
  • the UE carries the PDU session identifier, S-NSSAI and DNN and other parameters and sends it to the AMF network element.
  • the AMF network element selects the SMF network element according to the S-NSSAI and DNN, and sends parameters such as the AMF network element's identity, the UE's permanent identity, the location information of the UE, the PDU session identity, and the S-NSSAI and DNN to the SMF network element.
  • the location information of the UE includes the TAI of the UE.
  • SMF selects the anchor UPF network element for the PDU session.
  • S1104 The SMF sends a service-oriented operation policy establishment control request (Npcf_SMPolicy Control_Create Request) to the PCF.
  • the request is used to obtain policy information related to the PDU session from the PCF.
  • S1105 The PCF sends a service operation request (Nudr_DM_Query) to the UDR.
  • the request is used to obtain information related to the application subscribed by the UE from the UDR.
  • the UDR sends a service operation response (Nudr_DM_Response) to the PCF, where the response includes information related to multiple applications subscribed by the UE.
  • the information related to the multiple applications subscribed by the UE includes the identities of the multiple applications subscribed by the UE.
  • the PCF generates a policy and charging control rule (Policy and Charging Control rule, PCC rule), and sends a control response (Npcf_SMPolicyControl_Create Response) to the SMF through a service-based operation policy establishment, and the SMF saves the PCC rule.
  • Policy and Charging Control rule Policy and Charging Control rule
  • PCC rule includes the identities of multiple applications subscribed by the UE.
  • S1108 The SMF network element determines the index information of each ECS option in the ECS option list corresponding to multiple domain names.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 11, and according to the DNAI list and Table 13 corresponding to each domain name, Obtain Table 17, and further determine each ECS option in the ECS option list corresponding to multiple domain names according to Table 17, as shown in Table 18.
  • the DNAI list includes at least one DNAI.
  • the ECS option list includes ECS options corresponding to at least one DNAI respectively.
  • Each ECS option includes an IP address.
  • the IP address contained in the ECS option is the IP address corresponding to the application platform. For the description of the IP address, please refer to the previous description, and the repetition will not be repeated.
  • S1109 The SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes index information of each ECS option in the ECS option list corresponding to multiple domain names.
  • the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF receives the first DNS request message.
  • the corresponding relationship and the index information of each ECS option in the ECS option list corresponding to the domain name determines the ECS option list corresponding to the domain name, adds the ECS option list corresponding to the domain name to the first DNS request, and obtains the second DNS request, and Send the second DNS request to the centralized DNS server.
  • SMF selects UPF as the anchor point of the PDU session according to parameters such as S-NSSAI and DNN.
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that the first DNS query request carries the ECS option list corresponding to the FQDN.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If included, determine the index information of each ECS option in the ECS option list corresponding to the FQDN in the translation table, and determine the index information of each ECS option in the ECS option corresponding to the FQDN according to the first correspondence ECS option list.
  • FIG. 12 is the fifth specific flowchart of the UE requesting the IP address corresponding to the domain name
  • FIG. 12 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. 9 .
  • Table 1 shows the correspondence between the APP ID, FQDN and the DNAI corresponding to the application platform configured on the SMF network element.
  • the SMF network element determines the second correspondence.
  • the first correspondence is the domain name, the index of at least one application platform where the application corresponding to the domain name is located, and the correspondence relationship between DNAI corresponding to the application platform corresponding to the domain name.
  • the SMF network element determines the second correspondence relationship according to Table 1 and the correspondence relationship between the DNAI corresponding to the application platform and the index of the application platform, as shown in Table 10.
  • S1202 The SMF network element sends a translation table to the UPF.
  • the translation table includes the second correspondence.
  • S1207 The SMF network element determines the index information of each DNAI in the DNAI list corresponding to multiple domain names.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 11, and according to the DNAI list and Table 13 corresponding to each domain name, Table 17 is obtained, and each DNAI index information in the DNAI list corresponding to multiple domain names is further determined according to Table 17, as shown in Table 18.
  • the DNAI list includes at least one DNAI.
  • the SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes the index information of the ECS option list corresponding to multiple domain names.
  • the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF corresponds to the domain name according to the second correspondence.
  • the index information of each DNAI in the DNAI list determines the DNAI list corresponding to the domain name, adds the DNAI list corresponding to the domain name to the first DNS request, obtains the second DNS request, and sends the second DNS request to the centralized DNS server .
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that the first DNS query request carries the DNAI list corresponding to the FQDN.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If it does, determine the index information of each DNAI in the DNAI list corresponding to the FQDN in the translation table, and determine the DNAI list corresponding to the FQDN according to the second correspondence and the index information of each DNAI in the DNAI list corresponding to the FQDN.
  • FIG. 13 is the sixth specific flowchart of the UE requesting the IP address corresponding to the domain name
  • FIG. 14 is a schematic diagram of the network architecture composed of network elements that may be involved in the embodiment shown in FIG. 9 .
  • the corresponding relationship between the DNAI corresponding to the application platform and the IP address of the local DNS server corresponding to the application platform is configured on the SMF network element, as shown in Table 19, and the corresponding relationship between the APP ID, FQDN, and the DNAI corresponding to the application platform is shown in Table 1. .
  • the SMF network element determines the third correspondence.
  • the first correspondence is the correspondence between the domain name, the index of at least one application platform where the application corresponding to the domain name is located, and the IP address of the local DNS server corresponding to the application platform corresponding to the domain name.
  • the SMF network element determines the second correspondence relationship according to Table 1 and Table 19 and the correspondence relationship between the DNAI corresponding to the application platform and the index of the application platform, as shown in Table 22.
  • S1302 The SMF network element sends a translation table to the UPF.
  • the translation table includes the second correspondence.
  • the SMF network element determines the index information of the IP address of the first local DNS server respectively corresponding to the multiple domain names.
  • the multiple domain names refer to the domain names corresponding to each of the multiple applications contracted by the UE.
  • the SMF network element determines the DNAI list corresponding to each domain name according to Table 1 and the current TAI of the UE, as shown in Table 11, and according to the DNAI list and Table 19 corresponding to each domain name, Obtain Table 23, and further determine each DNAI index information in the DNAI list corresponding to multiple domain names according to Table 23, as shown in Table 24.
  • the DNAI list includes at least one DNAI.
  • the SMF network element sends an N4 session establishment request message to the UPF.
  • the N4 session establishment request message includes a translation table and indication information.
  • the translation table includes index information of the ECS option list corresponding to multiple domain names.
  • the indication information indicates that when the first DNS request message sent by the UE includes any one of the multiple domain names, the UPF corresponds to the domain name according to the third correspondence.
  • the index information of the IP address of the first local DNS server determines the IP address of the first local DNS server corresponding to the domain name, and the target address of the first DNS request is modified to the IP address of the first local DNS server corresponding to the domain name to obtain And send the second DNS request to the first local DNS server corresponding to the domain name.
  • the UE sends the first DNS query request to the UPF.
  • the first DNS query request carries the FQDN.
  • the UPF determines that the first DNS query request carries the IP address of the first local DNS server corresponding to the FQDN.
  • the UPF After the UPF receives the first DNS query request, the UPF checks whether the FQDN carried in the first DNS query request is included in the translation table. If included, determine the index information of the IP address of the first local DNS server corresponding to the FQDN in the translation table, and determine the index information of the first local DNS server corresponding to the FQDN according to the third correspondence and the index information of the IP address of the first local DNS server corresponding to the FQDN The IP address of a local DNS server.
  • the SMF obtains the latest location where the UE is currently located, such as a new (new) TAI.
  • UPF saves the UE's DNS query records, as shown in Table 25:
  • S1501 SMF determines a new translation table (new translation table) according to new TAI.
  • S1502 SMF sends new translation table to UPF.
  • the notification message carries a DNS flush indication, a PDU session identifier, and FQDN-1.
  • the UPF can send a notification message to the SMF through the N4 interface.
  • the SMF sends a NAS message to the UE.
  • the NAS message carries indication information and FQDN-1.
  • the SMF learns that the UE needs to refresh the IP address corresponding to FQDN-1 according to the domain name refresh instruction, and the SMF sends a NAS message to the UE, and the NAS message carries the instruction information.
  • the indication information is used to trigger the UE to initiate a DNS query.
  • S1506 The UE sends a DNS query request to the UPF, and the DNS query request carries FQDN-1.
  • the UE After the UE learns that the DNS cache record corresponding to FQDN-1 is invalid after receiving the NAS message, the UE sends a DNS query request to UPF to request the IP address corresponding to FQDN-1.
  • the session function management network element and/or the first user plane network element may perform some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application also Other operations or variations of various operations can be performed. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it may not be necessary to perform all the operations in the embodiments of the present application.
  • each network element such as the session function management network element and the first user plane network element, includes hardware structures and/or software modules corresponding to each function in order to realize the above-mentioned functions.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • an embodiment of the present application further provides an apparatus 1600.
  • the apparatus 1600 includes a transceiver unit 1602 and a processing unit 1601.
  • the apparatus 1600 is used to implement the function of the session function management network element in the foregoing method.
  • the device may be a session function management network element.
  • the transceiving unit 1602 is configured to receive first information from a first network element, where the first information includes at least one of a first domain name and an identification of a first application corresponding to the first domain name; Wherein, the first domain name is the domain name requested by the terminal device;
  • the processing unit 1601 is configured to determine second information at least according to the first information and the location information of the terminal device;
  • the transceiver unit 1602 is configured to send the second information to the first network element, where the second information is used to obtain the first IP address corresponding to the first domain name.
  • the apparatus 1600 is used to implement the function of the first user plane network element in the foregoing method.
  • the device may be the first user plane network element.
  • the processing unit 1601 is configured to obtain first information, where the first information includes at least one of a first domain name and an identification of a first application corresponding to the first domain name; the first domain name is a terminal The domain name requested by the device;
  • the transceiver unit 1602 is configured to send the first information to the session management function network element;
  • the transceiving unit 1602 is configured to receive second information from the session management function network element, where the second information is used to obtain the first IP address corresponding to the first domain name;
  • the transceiver unit 1602 is configured to send the first IP address to the terminal device.
  • the processing unit 1601 and the transceiving unit 1602 please refer to the record in the above method embodiment.
  • the division of modules in the embodiments of this application is illustrative, and it is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of this application can be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the device may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the device includes a processor and an interface, and the interface may be an input/output interface.
  • the processor completes the function of the aforementioned processing unit 1601
  • the interface completes the function of the aforementioned transceiver unit 1602.
  • the device may also include a memory, where the memory is used to store a program that can be run on the processor, and the processor implements the method of each of the foregoing embodiments when the program is executed by the processor.
  • an embodiment of the present application further provides an apparatus 1700.
  • the device 1700 includes: a communication interface 1701, at least one processor 1702, and at least one memory 1703.
  • the communication interface 1701 is used to communicate with other devices through a transmission medium, so that the device used in the apparatus 1700 can communicate with other devices.
  • the memory 1703 is used to store computer programs.
  • the processor 1702 calls the computer program stored in the memory 1703, and transmits and receives data through the communication interface 1701 to implement the method in the foregoing embodiment.
  • the memory 1703 is used to store a computer program; the processor 1702 calls the computer program stored in the memory 1703, and executes the method executed by the terminal device in the foregoing embodiment through the communication interface 1701.
  • the memory 1703 is used to store a computer program; the processor 1702 calls the computer program stored in the memory 1703, and executes the method executed by the network device in the foregoing embodiment through the communication interface 1701.
  • the communication interface 1701 may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the processor 1702 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or execute the The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the memory 1703 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory, such as random access memory (random access memory). -access memory, RAM).
  • the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of realizing a storage function.
  • the memory 1703 is coupled with the processor 1702.
  • the coupling in the embodiments of the present application is an interval coupling or a communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the memory 1703 may also be located outside the apparatus 1700.
  • the processor 1702 may cooperate with the memory 1703 to operate.
  • the processor 1702 may execute program instructions stored in the memory 1703.
  • At least one of the at least one memory 1703 may also be included in the processor 1702.
  • the embodiment of the present application does not limit the connection medium between the communication interface 1701, the processor 1702, and the memory 1703.
  • the memory 1703, the processor 1702, and the communication interface 1701 may be connected by a bus, and the bus may be divided into an address bus, a data bus, and a control bus.
  • the apparatus in the embodiment shown in FIG. 16 may be implemented by the apparatus 1700 shown in FIG. 17.
  • the processing unit 1601 may be implemented by the processor 1702
  • the transceiver unit 1602 may be implemented by the communication interface 1701.
  • the embodiments of the present application also provide a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program runs on a device, the device executes the methods shown in each of the foregoing embodiments.
  • An embodiment of the present application also provides a communication system, which includes a session function management network element and a first network element, where the first network element may be any of a DNS proxy, an address resolution function network element, or a centralized DNS server A sort of.
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented by software, it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD for short)), or a semiconductor medium (for example, a solid state disk Solid State Disk SSD), etc.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé, un appareil et un système de découverte d'application. Le procédé comprend les étapes suivantes : un élément de réseau de fonction de gestion de session obtient des premières informations ; l'élément de réseau de fonction de gestion de session détermine des secondes informations au moins en fonction des premières informations et d'informations de position d'un dispositif terminal ; et l'élément de réseau de fonction de gestion de session envoie un premier nom de domaine et les secondes informations à un premier élément de réseau de plan utilisateur. Les premières informations comprennent un identifiant d'une première application correspondant au premier nom de domaine et des informations de position d'au moins une plateforme d'application où se trouve la première application, et les secondes informations sont utilisées pour obtenir une première adresse IP correspondant au premier nom de domaine. En adoptant le procédé, le dispositif terminal peut accéder à un service local à proximité lorsqu'il demande, au niveau d'une position indiquée par les informations de position du dispositif terminal, d'accéder au premier nom de domaine, et un retard plus court peut être obtenu pour accéder au service, ce qui permet d'assurer un rendement de communication élevé.
PCT/CN2020/076857 2020-02-26 2020-02-26 Procédé, appareil et système de découverte d'application WO2021168715A1 (fr)

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