WO2021197175A1 - 应用服务器的发现方法及相关装置 - Google Patents

应用服务器的发现方法及相关装置 Download PDF

Info

Publication number
WO2021197175A1
WO2021197175A1 PCT/CN2021/082830 CN2021082830W WO2021197175A1 WO 2021197175 A1 WO2021197175 A1 WO 2021197175A1 CN 2021082830 W CN2021082830 W CN 2021082830W WO 2021197175 A1 WO2021197175 A1 WO 2021197175A1
Authority
WO
WIPO (PCT)
Prior art keywords
information
access location
network device
application
server
Prior art date
Application number
PCT/CN2021/082830
Other languages
English (en)
French (fr)
Inventor
周晓云
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2021197175A1 publication Critical patent/WO2021197175A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information

Definitions

  • This application relates to the field of mobile communications, and in particular, to a discovery method and related devices of an application server.
  • the user equipment (UE) establishes a protocol data unit (PDU) session after accessing the network, and accesses the external data network (data network) through the PDU session.
  • network, DN interact with the application server deployed in the DN.
  • the application server of the same application can be deployed in multiple locations, so that the network can select a PDU session anchor (PSA) that is close to the UE and supports the UE's access to the DN according to the UE's access location to reduce circuitous routing , Reduce network latency.
  • PSA PDU session anchor
  • the UE wants to access the application server, it needs to query the UE address through the domain name system (domain name system, DNS) application function (application function, AF), determine the preferred access location according to the UE address, and then query the DNS server according to the access location To get the address of the application server.
  • DNS domain name system
  • AF application function
  • the embodiment of the present application provides a method and related device for discovering an application server, which can simplify DNS AF configuration.
  • an embodiment of the present application provides a method for discovering an application server.
  • the method includes: a first network device receives first information of a second network device, the first information includes an application identifier; the first network device At least one first access location is determined according to at least the first information, where the first access location is a candidate access location for the user equipment to access the application; the first network device uses the identification information of the at least one first access location Sent to the second network device, the identification information of the at least one first access location is used to determine the address of the server of the application.
  • the second network device is DNS AF
  • the candidate access location of the application can be determined by the first network device and sent to the second network device, so that the second network device can be based on the identification information of the candidate access location Determine the address of the application's server.
  • the implementation of the embodiments of this application can simplify the configuration of DNS AF.
  • the first network device can determine at least one candidate access location to improve the reliability of the server of the application finally selected by the DNS.
  • the first network device is a session management network element; the method further includes: the first network receives request information sent by the second network device, and the request information is used to request the first network The device selects a user plane network element for the user equipment to access the application.
  • the first network device is a session management function (SMF). Since the SMF has configured the topology of the entire network, the SMF determines the candidate access location, and the nearest application server can be selected for the UE. .
  • SMF session management function
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the second network device may carry the identification information of the access location in the request information, so that the first network device can select the access application for the user equipment according to the identification information.
  • User plane network element when the candidate access location is not unique, the second network device may carry the identification information of the access location in the request information, so that the first network device can select the access application for the user equipment according to the identification information.
  • the first network device determines at least one first access location at least according to the first information, including: the first network device determines the at least one first access location according to the data-oriented control information corresponding to the application, and the current user equipment At least one of location information, operator policy, and current network load status determines the at least one first access location.
  • SMF can comprehensively determine candidate access locations based on at least one of data-oriented control information corresponding to the application, current location information of user equipment, operator policies, and current network load conditions, which can improve The success rate of the final selected user plane network element reduces the detour and network delay.
  • the data-oriented control information corresponding to the above-mentioned application is obtained by the above-mentioned first network device from a unified data repository or a policy control network element.
  • the foregoing first network device is a policy control network element; the foregoing first network device determines at least one first access location at least according to the foregoing first information, including: the foregoing first network device performs session management The network element sends second information, where the second information is used to request the user equipment to access the access location of the application; the first network device receives the identification information of the at least one access location sent by the session management network element.
  • the first network device is a policy control function (PCF)
  • the PCF initiates the third information to the SMF
  • the SMF determines the candidate access location and sends it to the PCF. Since SMF has configured the topology of the entire network, SMF determines the candidate access location, and can select an application server for the UE nearby.
  • PCF policy control function
  • the identification information of the at least one first access location is directed by the session management network element according to the data-oriented control information corresponding to the application, the current location information of the user equipment, the operator policy, and the current network At least one of the load conditions is determined.
  • SMF can comprehensively determine candidate access locations based on at least one of data-oriented control information corresponding to the application, current location information of user equipment, operator policies, and current network load conditions, which can improve The success rate of the final selected user plane network element reduces the detour and network delay.
  • the foregoing first network device provides the foregoing session management network element with data-oriented control information corresponding to the foregoing application.
  • the above method further includes: the first network device receives request information from the second network device, and the request information is used to request the session management network element to select a user to access the application for the user equipment Surface network element.
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the second network device may carry the identification information of the access location in the request information, so that the first network device can select the access application for the user equipment according to the identification information.
  • User plane network element when the candidate access location is not unique, the second network device may carry the identification information of the access location in the request information, so that the first network device can select the access application for the user equipment according to the identification information.
  • the identification information of the at least one first access location is at least one data network access identification DNAI and/or subnet information.
  • the aforementioned at least one DNAI is a DNAI corresponding to a user plane network element that can be used by the aforementioned user equipment to access the aforementioned application.
  • the at least one subnet information is subnet information corresponding to a user plane network element that the user equipment can use to access the application.
  • the foregoing subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the address of the server of the application is an address sent by the DNS server of the domain name system to the second network device.
  • an embodiment of the present application provides a method for discovering an application server, including: a second network device sends first information to a first network device, and the first information includes an application identifier; and the second network device receives the foregoing The first identification information of at least one first access location sent by the first network device; the first access location is a candidate access location for the user equipment to access the application; the second network device is based on the at least one first access location The first identification information of the location determines the address of the first server of the above application.
  • the second network device is DNS AF
  • the candidate access location of the application can be determined by the first network device and sent to the second network device, so that the second network device can be based on the identification information of the candidate access location Determine the address of the application's server.
  • the implementation of the embodiments of this application can simplify the configuration of DNS AF.
  • the first network device can determine at least one candidate access location to improve the reliability of the server of the application finally selected by the DNS.
  • determining the address of the first server of the application by the second network device according to the first identification information of the at least one first access location includes: the second network device reports to the first domain name system The DNS server sends third information.
  • the third information includes the second identification information of at least one first access location, and the second identification information of the at least one first access location is based on the identification information of the at least one first access location.
  • the first identification information is determined; the second network device receives the address of at least one server of the application corresponding to the second identification information of the at least one first access location sent by the first DNS server;
  • the address of the first server is determined among the addresses of the at least one server.
  • the first DNS server is a centralized DNS server
  • the DNS AF sends identification information of at least one candidate access location to the DNS server
  • the DNS server returns the application server corresponding to the at least one candidate access location.
  • the above method further includes: the second network device receives the first priority information of the first identification information of the at least one first access location sent by the one network device; the second The network device determining the address of the first server of the application according to the first identification information of the at least one first access location includes: the second network device sends third information to the first DNS server, and the third information includes at least Second identification information of a first access location, wherein the second identification information of the at least one first access location is determined according to the first identification information of the at least one first access location; the second network device receives the first access location; At least one server address of the application corresponding to the second identification information of the at least one first access location sent by a DNS server; the second network device according to the first priority information and the at least one first access location At least one server address of the application corresponding to the second identification information determines the address of the first server.
  • the second network device may select at least one application server with better performance according to the priority information of the candidate access location, so that the user equipment can quickly access the application server and reduce network delay.
  • the third information further includes second priority information corresponding to the second identification information of the at least one first access location, wherein the second priority information is based on the first priority information Determine; the address of the at least one first server sent by the first DNS server is determined by the first DNS server according to the second priority information.
  • the centralized DNS server may initially screen at least one candidate access location based on priority information, and then the second network device may return one or more application servers from the centralized DNS server based on the priority information Screening is performed so that user equipment can quickly access the application server and reduce network delay.
  • the second network device determining the address of the first server of the application according to the first identification information of the at least one first access location includes: the second network device according to the at least one first The first identification information of an access location determines the second DNS server corresponding to the second access location, and sends fourth information to the second DNS server; the fourth information is used to obtain the address of the first server;
  • the first identification information of a first access location includes the first identification information of the second access location; the second network device receives the address of the first server sent by the second DNS server.
  • the second DNS server is a local DNS server
  • the DNS AF selects an access location from at least one candidate access location, and sends the identification information of the access location to the corresponding local DNS server
  • the local DNS server determines the address of the final application server.
  • the above method further includes: the second network device receives priority information corresponding to the first identification information of the at least one first access location sent by the first network device; the second network The device determines the second DNS server corresponding to the second access location according to the first identification information of the at least one first access location, and sends fourth information to the second DNS server, including: the second network device according to the at least Priority information corresponding to the first identification information of a first access location determines the second DNS server corresponding to the second access location, and sends the fourth information to the second DNS server.
  • the DNS AF selects the second access location according to the priority of the candidate access location, and selects the current optimal access location, so that the user equipment can quickly access the application server and reduce network delay.
  • the foregoing method further includes: the foregoing second network device receives fourth information sent by the foregoing user equipment, and the foregoing fourth information is used to request the address of the server of the foregoing application.
  • the above method further includes: the second network device sends request information to the first network device, and the request information is used to request the first network device to select a user to access the application for the user equipment.
  • Surface network element the second network device sends request information to the first network device, and the request information is used to request the first network device to select a user to access the application for the user equipment.
  • the request information further includes first identification information of the second access location, the at least one first access location includes the second access location, and the second access location corresponds to the first access location.
  • the address of a server The address of a server.
  • the foregoing method further includes: the foregoing second network device sends the address of the foregoing first server to the foregoing user equipment.
  • the first identification information of the at least one first access location is at least one first data network access identification DNAI and/or first subnet information.
  • the at least one first DNAI is a DNAI corresponding to a user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information is the subnet information corresponding to the user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the second identification information of the at least one first access location is at least one second DNAI and/or second subnet information, wherein the at least one second DNAI is based on the at least one first access location.
  • the DNAI determines that the at least one second subnet information is based on the at least one first DNAI or the first subnet information.
  • an embodiment of the present application provides a method for discovering an application server, including: a first network device receives first information of a second network device, and the first information includes an application identifier; the first network device is at least based on The foregoing first information determines at least one first access location, and the foregoing first access location is a candidate access location for the user equipment to access the foregoing application; the first network device uses the first identification information of the at least one first access location Sent to the second network device; the second network device determines the address of the first server of the application according to the first identification information of the at least one first access location.
  • the first network device is a session management network element; the method further includes: the first network device receives request information sent by the second network device, and the request information is used to request the first network device. The network device selects the user plane network element for the user equipment to access the application.
  • the request information further includes identification information of the second access location, and the at least one access location includes the second access location.
  • the first network device determines at least one first access location at least according to the first information, including: the first network device determines the at least one first access location according to the data-oriented control information corresponding to the application, and the current user equipment At least one of location information, operator policy, and current network load status determines the at least one first access location.
  • the data-oriented control information corresponding to the above-mentioned application is obtained by the above-mentioned first network device from a unified data repository or a policy control network element.
  • the foregoing first network device is a policy control network element; the foregoing first network device determines at least one first access location at least according to the foregoing first information, including: the foregoing first network device performs session management The network element sends second information, where the second information is used to request the user equipment to access the access location of the application; the first network device receives the identification information of the at least one access location sent by the session management network element.
  • the identification information of the at least one first access location is directed by the session management network element according to the data-oriented control information corresponding to the application, the current location information of the user equipment, the operator policy, and the current network At least one of the load conditions is determined.
  • the foregoing first network device provides the foregoing session management network element with data-oriented control information corresponding to the foregoing application.
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • determining the address of the first server of the application by the second network device according to the first identification information of the at least one first access location includes: the second network device reports to the first domain name system The DNS server sends third information.
  • the third information includes the second identification information of at least one first access location, and the second identification information of the at least one first access location is based on the identification information of the at least one first access location.
  • the first identification information is determined; the second network device receives the address of at least one server of the application corresponding to the second identification information of the at least one first access location sent by the first DNS server;
  • the address of the first server is determined among the addresses of the at least one server.
  • the foregoing method further includes: the foregoing first network device sends first priority information of the first identification information of the at least one first access location to the foregoing second network device; and the foregoing second network device;
  • the network device determining the address of the first server of the application according to the first identification information of the at least one first access location includes: the second network device sends third information to the first DNS server, and the third information includes at least Second identification information of a first access location, wherein the second identification information of the at least one first access location is determined according to the first identification information of the at least one first access location; the second network device receives the first access location; At least one server address of the application corresponding to the second identification information of the at least one first access location sent by a DNS server; the second network device according to the first priority information and the at least one first access location At least one server address of the application corresponding to the second identification information determines the address of the first server.
  • the third information further includes second priority information corresponding to the second identification information of the at least one first access location, wherein the second priority information is based on the first priority information Determine; the address of the at least one first server sent by the first DNS server is determined by the first DNS server according to the second priority information.
  • the second network device determining the address of the first server of the application according to the first identification information of the at least one first access location includes: the second network device according to the at least one first The first identification information of an access location determines the second DNS server corresponding to the second access location, and sends fourth information to the second DNS server; the fourth information is used to obtain the address of the first server;
  • the first identification information of a first access location includes the first identification information of the second access location; the second network device receives the address of the first server sent by the second DNS server.
  • the foregoing method further includes: the foregoing first network device sending priority information corresponding to the first identification information of the at least one first access location to the foregoing second network device; the foregoing second network The device determines the second DNS server corresponding to the second access location according to the first identification information of the at least one first access location, and sends fourth information to the second DNS server, including: the second network device according to the at least Priority information corresponding to the first identification information of a first access location determines the second DNS server corresponding to the second access location, and sends the fourth information to the second DNS server.
  • the above method further includes: the second network device receives fifth information sent by the user equipment, and the fifth information is used to request the address of the server of the application.
  • the foregoing method further includes: the foregoing second network device sends the address of the foregoing first server to the foregoing user equipment.
  • the first identification information of the one or more access locations is one or more first data network access identification DNAI and/or first subnet information.
  • the at least one first DNAI is a DNAI corresponding to a user plane network element that the user equipment can use to access the application.
  • the at least one first subnet information is subnet information corresponding to a user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the second identification information of the at least one first access location is at least one second DNAI and/or second subnet information, wherein the at least one second DNAI is based on the at least one first access location.
  • the DNAI determines that the at least one second subnet information is based on the at least one first DNAI or the first subnet information.
  • the beneficial effects of the third aspect can be referred to the beneficial effects of the first aspect and the second aspect, which will not be repeated here.
  • an embodiment of the present application provides a network device, including: a receiving unit, configured to receive first information sent by a second network device, where the above-mentioned first information includes an application identifier; The first information determines at least one first access location, and the first access location is a candidate access location for the user equipment to access the application; the sending unit is configured to send the identification information of the at least one first access location to the foregoing For the second network device, the identification information of the at least one first access location is used for determining the address of the server of the application.
  • the aforementioned network device is a session management network element; the aforementioned receiving unit is further configured to: receive request information sent by the aforementioned second network device, and the aforementioned request information is used to request the aforementioned network device to select for the aforementioned user equipment. Access the user plane network element of the above application.
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the above determining unit is specifically configured to determine the above based on at least one of data-oriented control information corresponding to the above application, current location information of the above user equipment, operator policies, and current network load conditions. At least one first access location.
  • the data-oriented control information corresponding to the above-mentioned application is obtained by the above-mentioned network device from a unified data repository or a policy control network element.
  • the aforementioned network device is a policy control network element; the aforementioned determining unit is specifically configured to: send second information to the session management network element, and the aforementioned second information is used to request the aforementioned user equipment to access the interface of the aforementioned application. Access location; receiving the identification information of the at least one access location sent by the session management network element.
  • the identification information of the at least one first access location is directed by the session management network element according to the data-oriented control information corresponding to the application, the current location information of the user equipment, the operator policy, and the current network At least one of the load conditions is determined.
  • the foregoing network device provides the foregoing session management network element with data-oriented control information corresponding to the foregoing application.
  • the receiving unit is further configured to: receive request information from the second network device, where the request information is used to request the session management network element to select a user plane network element for the user equipment to access the application. .
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the identification information of the at least one first access location is at least one data network access identification DNAI and/or subnet information.
  • the aforementioned at least one DNAI is a DNAI corresponding to a user plane network element that can be used by the aforementioned user equipment to access the aforementioned application.
  • the at least one subnet information is subnet information corresponding to a user plane network element that the user equipment can use to access the application.
  • the foregoing subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the address of the server of the application is an address sent by the DNS server of the domain name system to the second network device.
  • the beneficial effects of the fourth aspect can be referred to the beneficial effects of the first aspect, which will not be repeated here.
  • an embodiment of the present application provides a network device, including: a sending unit, configured to send first information to a first network device, where the first information includes an application identifier; and a receiving unit, configured to receive the first information.
  • the first identification information determines the address of the first server of the above application.
  • the above determining unit is specifically configured to: send third information to the first domain name system DNS server, the above third information includes at least one second identification information of the first access location, wherein the above at least The second identification information of a first access location is determined according to the first identification information of the at least one first access location; corresponding to the second identification information of the at least one first access location sent by the first DNS server The address of at least one server of the aforementioned application; the address of the first server is determined from the address of the aforementioned at least one server.
  • the receiving unit is further configured to: receive first priority information of the first identification information of the at least one first access location sent by a network device; the determining unit is specifically configured to : Send third information to the first DNS server, the third information includes the second identification information of at least one first access location, and the second identification information of the at least one first access location is based on the at least one first access location.
  • the first identification information of the access location is determined; the at least one server address of the application corresponding to the second identification information of the at least one first access location sent by the first DNS server is received; according to the first priority information and the foregoing At least one server address of the application corresponding to the second identification information of the at least one first access location determines the address of the first server.
  • the third information further includes second priority information corresponding to the second identification information of the at least one first access location, wherein the second priority information is based on the first priority information Determine; the address of the at least one first server sent by the first DNS server is determined by the first DNS server according to the second priority information.
  • the determining unit is specifically configured to: determine the second DNS server corresponding to the second access location according to the first identification information of the at least one first access location, and report to the second DNS server Send fourth information; the fourth information is used to obtain the address of the first server; the first identification information of the at least one first access location includes the first identification information of the second access location; the second network device Receiving the address of the first server sent by the second DNS server.
  • the receiving unit is specifically configured to: receive priority information corresponding to the first identification information of the at least one first access location sent by the first network device; the determining unit is specifically configured to: The second DNS server corresponding to the second access location is determined according to the priority information corresponding to the first identification information of the at least one first access location, and the fourth information is sent to the second DNS server.
  • the receiving unit is further configured to receive fifth information sent by the user equipment, where the fifth information is used to request the address of the server of the application.
  • the sending unit is further configured to send request information to the first network device, and the request information is used to request the first network device to select a user plane network element for the user equipment to access the application. .
  • the request information further includes first identification information of the second access location, the at least one first access location includes the second access location, and the second access location corresponds to the first access location.
  • the address of a server The address of a server.
  • the sending unit is further configured to send the address of the first server to the user equipment.
  • the first identification information of the at least one first access location is at least one first data network access identification DNAI and/or first subnet information.
  • the at least one first DNAI is a DNAI corresponding to a user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information is the subnet information corresponding to the user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the second identification information of the at least one first access location is at least one second DNAI and/or second subnet information, wherein the at least one second DNAI is based on the at least one first access location.
  • the DNAI determines that the at least one second subnet information is based on the at least one first DNAI or the first subnet information.
  • the beneficial effects of the fifth aspect can be referred to the beneficial effects of the second aspect, which will not be repeated here.
  • an embodiment of the application provides a communication system, the communication system includes: a first network device and a second network device; the first network device is any one of the fourth aspect or the fourth aspect of the embodiments of the application A network device provided by a possible implementation manner, and the second network device is a network device provided by the fifth aspect or any possible implementation manner of the fifth aspect of the embodiments of the present application.
  • beneficial effects of the sixth aspect can be referred to the beneficial effects of the first aspect and the second aspect, which will not be repeated here.
  • an embodiment of the present application provides a network device, including a processor, and when the processor invokes the computer program in the memory, the method in the first aspect or any one of the implementation manners of the first aspect is executed .
  • the beneficial effects of the seventh aspect can be referred to the beneficial effects of the first aspect, which will not be repeated here.
  • an embodiment of the present application provides a network device, including a processor, and when the processor calls the computer program in the memory, the method described in the second aspect or any one of the second aspects is implement.
  • the beneficial effects of the eighth aspect can be referred to the beneficial effects of the second aspect, which will not be repeated here.
  • an embodiment of the present application provides a chip.
  • the chip includes at least one processor, a memory, and an interface circuit.
  • the memory, the transceiver, and the at least one processor are interconnected by wires, and the at least one memory stores Instruction: When the above instruction is executed by the above processor, the first aspect or any one of the implementation manners of the first aspect is implemented.
  • the beneficial effects of the ninth aspect can be referred to the beneficial effects of the first aspect, which will not be repeated here.
  • an embodiment of the present application provides a chip.
  • the chip includes at least one processor, a memory, and an interface circuit.
  • the memory, the transceiver, and the at least one processor are interconnected by wires, and the at least one memory stores Instruction: When the above instruction is executed by the above processor, the second aspect or any one of the implementation manners of the second aspect is realized.
  • beneficial effects of the tenth aspect can be referred to the beneficial effects of the second aspect, which will not be repeated here.
  • an embodiment of the present application provides a computer-readable storage medium.
  • the above-mentioned computer-readable storage medium stores instructions. When it runs on a computer or a processor, the first aspect or the first On the one hand, the method provided by any one of the implementations can be realized.
  • the beneficial effects of the eleventh aspect can be referred to the beneficial effects of the first aspect, which will not be repeated here.
  • the embodiments of the present application provide a computer-readable storage medium.
  • the above-mentioned computer-readable storage medium stores instructions.
  • the method provided by any one of the two aspects can be realized.
  • beneficial effects of the twelfth aspect can be referred to the beneficial effects of the second aspect, which will not be repeated here.
  • the embodiments of the present application provide a computer program product. When it runs on a network device, the method provided by the first aspect or any one of the first aspects of the embodiments of the present application can be implemented.
  • beneficial effects of the thirteenth aspect can be referred to the beneficial effects of the first aspect, which will not be repeated here.
  • an embodiment of the present application provides a computer program product. When it runs on a network device, the method provided by the second aspect or any one of the second aspect of the embodiments of the present application can be implemented.
  • beneficial effects of the fourteenth aspect can be referred to the beneficial effects of the second aspect, which will not be repeated here.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of this application.
  • FIG. 2 is a schematic flowchart of an application server discovery method provided by an embodiment of the application
  • FIG. 3 is a schematic flowchart of another method for discovering an application server according to an embodiment of the application
  • FIG. 4 is a schematic flowchart of another method for discovering an application server according to an embodiment of the application.
  • FIG. 5 is a schematic structural diagram of a network device provided by an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of another network device provided by an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of a communication system provided by an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of another network device provided by an embodiment of this application.
  • At least one (item) refers to one or more
  • multiple refers to two or more than two
  • at least two (item) refers to two or three and three
  • “and/or” is used to describe the association relationship of associated objects, which means that there can be three kinds of relationships.
  • a and/or B can mean: there is only A, only B, and both A and B. In this case, A and B can be singular or plural.
  • the character “/” generally indicates that the associated objects before and after are in an "or” relationship.
  • the following at least one item (a) or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • At least one of a, b, or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c" ", where a, b, and c can be single or multiple.
  • the application processor discovery method provided in this application can be applied to various communication systems, such as Internet of Things (IoT) systems, narrowband Internet of Things (NB-IoT) systems, and long-term evolution (long term evolution, LTE) system, it can also be the fifth generation (5th-generation, 5G) communication system, it can also be a hybrid architecture of LTE and 5G, it can also be a 5G new radio (NR) system, and the future New communication systems, etc. appearing in the development of communication.
  • IoT Internet of Things
  • NB-IoT narrowband Internet of Things
  • LTE long-term evolution
  • 5G fifth generation
  • 5G fifth generation
  • NR 5G new radio
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • the various parts involved in FIG. 1 are as follows:
  • the terminal device 110 is also referred to as user equipment (UE), terminal, and so on.
  • a terminal device is a device with a wireless transceiver function, which can connect to one or more core networks (core networks, CN) to communicate. It can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed on the water, such as on a ship, and it can also be deployed in the air, such as on an airplane, balloon, or satellite.
  • core networks core networks
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and wireless terminals in transportation safety , Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • VR virtual reality
  • AR augmented reality
  • industrial control industrial control
  • Wireless terminals in wireless terminals in self-driving
  • wireless terminals in remote medical wireless terminals in smart grid
  • wireless terminals in transportation safety Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • (Radio) access network ((radio) access network, (R) AN) 120 used to provide network access functions for authorized terminal equipment in a specific area, and can use different quality transmissions according to the level of terminal equipment, business needs, etc. tunnel.
  • the (R)AN can manage wireless resources, provide access services for terminal devices, and then complete the forwarding of control information and/or data information between the terminal devices and the core network (CN).
  • the access network device in the embodiment of the present application is a device that provides a wireless communication function for terminal devices, and may also be referred to as a network device.
  • the access network equipment may include: next generation node basestation (gNB) in 5G system, evolved node B (evolved node B, eNB) in long term evolution (LTE), wireless Network controller (radio network controller, RNC), node B (node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved nodeB) , Or home node B (HNB), base band unit (BBU), transmission point (transmitting and receiving point, TRP) (or called transmission receiving point), transmission point (TP), small base station equipment (pico), mobile switching center, or network equipment in the future network.
  • gNB next generation node basestation
  • eNB evolved node B
  • LTE long term evolution
  • RNC wireless Network controller
  • node B node B
  • BSC base station controller
  • the user plane function (UPF) network function 130 is used for packet routing and forwarding, quality of service (QoS) processing of user plane data, and so on.
  • QoS quality of service
  • the data network (DN) network function 140 is used to provide a data transmission network.
  • Access management function (access and mobility management function, AMF) network function 150 can be used to implement mobility management entity (mobility management entity, MME) functions except session management Other functions, such as lawful interception and access authorization/authentication functions.
  • AMF network function is hereinafter referred to as AMF.
  • the AMF network function includes a remote AMF and a relay AMF.
  • the remote AMF is: an AMF used to provide services for a remote UE;
  • the relay AMF is: a relay AMF is used to provide services for a relay UE AMF.
  • Session management function (SMF) 160 mainly used for session management, terminal device Internet protocol (IP) address allocation and management, selection of manageable user plane functions, policy control and charging functions End point of the interface and notification of downlink data, etc.
  • IP Internet protocol
  • the session management function network element may also be referred to as the session management network element.
  • the policy control network function 170 such as a policy control function (PCF) is a unified policy framework used to guide network behavior, and provides policy rule information for control plane functions (such as AMF, SMF network functions, etc.).
  • PCF policy control function
  • the policy control function network element may also be referred to as the policy control network element.
  • the authentication server function (authentication server function, AUSF) 180 is used for authentication services, generating keys to implement two-way authentication for terminal devices, and supporting a unified authentication framework.
  • the unified data management (UDM) network function 190 can be used to process terminal device identification, access authentication, registration, and mobility management. It can be understood that the UDM network function is hereinafter referred to as UDM for short.
  • the application function (AF) 1100 is used for data routing affected by applications, access to network opening functions, and interaction with the policy framework for policy control.
  • the network slice selection function can be used to determine network slice instances, select AMF network functions, and so on.
  • Network storage network functions such as including network repository function (NRF) can be used to maintain real-time information of all network functions and services in the network.
  • NRF network repository function
  • the network architecture shown in FIG. 1 may also include a ProSe function, and the ProSe function may be used to perform the management and control of the ProSe service, and so on.
  • the mobility management network function in the embodiment of the present application may be the AMF network function 150 shown in FIG. 1, or may be other network functions having the aforementioned AMF network function 150 in the future communication system.
  • the mobility management network function in this application may also be a mobility management entity (MME) in long term evolution (LTE).
  • MME mobility management entity
  • LTE long term evolution
  • the AMF network function 150 is referred to as AMF for short, and the terminal device 110 is referred to as UE. That is, the AMF described later in the embodiments of this application can be replaced with mobility management network functions or core network equipment, and the UE can be either Replace with terminal equipment.
  • the network architecture (for example, 5G network architecture) shown in Figure 1 adopts a service-based architecture.
  • Traditional network element functions or network functions
  • Self-management and reusable network function service modules can realize customized network function reconstruction through flexible definition of service module collections, and form business processes through a unified service call interface externally.
  • the schematic diagram of the network architecture shown in FIG. 1 can be understood as a schematic diagram of a service-based 5G network architecture in a non-roaming scenario. For roaming scenarios, the embodiments of this application are also applicable.
  • the above-mentioned network function or function can be either a network element in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform).
  • FIG. 2 is a schematic flowchart of an application server discovery method provided by an embodiment of the present application. This method can be applied to the network architecture shown in Figure 1. As shown in Figure 3, the method includes:
  • the first network device receives the first information sent by the second network device.
  • the second network device is DNS AF.
  • the first network device is SMF or PCF.
  • the UE may send DNS request information (DNS Request) to the DNS AF.
  • DNS Request DNS request information
  • the request information may carry the fully qualified domain name (FQDN) of the application.
  • the DNS AF can check whether the application has a service layer agreement (SLA) based on the FQDN, that is, there is a commercial agreement between the application and the operator. If it exists, the DNS AF sends the application's preferred access location information request to the SMF.
  • the request may be referred to as the first information.
  • the first information may include application identification (application identity, APP ID).
  • the first information may also include the IP address of the UE, and the address may be an IPv4 address or an IPv6 address.
  • the first network device determines at least one first access location at least according to the first information.
  • the first access location is a candidate access location for the UE to access the application, that is, the UE can access the DN through the UPF corresponding to the access location, and the application server corresponding to the application is deployed in the DN.
  • the access location for the UE to access the application is one of the foregoing multiple first access locations.
  • the SMF will select the aforementioned UPF as the PDU session anchor (PSA) for the PDU session established by the UE.
  • the access location can be used to determine the UPF for the UE to access the application.
  • the first access location is the location of the user plane through which the UE accesses the application, rather than the location of the UE itself.
  • the location of the user plane can be represented by subnet information and/or a data network access identifier (DNAI).
  • the first network device is an SMF.
  • the SMF can determine at least one first access location based on at least one of the following: application of corresponding data-oriented control information, current location information of the UE, operator policy, current network load status, and so on.
  • the data-oriented control information corresponding to the application defines the location information corresponding to the DN where the application server is deployed (data network access identifier (DNAI)) and the corresponding time to access the application server (time validity conditions) , UE's location information (time validity conditions), etc. Therefore, if there is data-oriented control information corresponding to the application, the SMF can determine the applicable DNAI based on information such as the current time and the current location of the UE. In addition, SMF can also determine the applicable DNAI based on the operator's strategy (for example, the operator has configured a data-oriented application for this application) and the current network load.
  • DNAI data network access identifier
  • the data-oriented control information corresponding to the application can be provided by the UDR. Specifically, it can directly interact with the UDR to obtain data-oriented control information corresponding to the application stored in the UDR. Or the SMF interacts with the PCF to obtain the data-oriented control information corresponding to the application obtained by the PCF from the UDR.
  • the first network device is a PCF.
  • the PCF can send a message to the SMF for requesting the UE to access the access location of the application.
  • the SMF can determine at least one first access location according to at least one of the following: data-oriented control information corresponding to the application, the current location information of the UE, and the operator Strategies and current network load conditions, etc.
  • the SMF sends the identification information of the at least one first access location to the PCF.
  • the data-oriented control information corresponding to the application can be provided by the PCF.
  • the SMF interacts with the PCF to obtain the data-oriented control information corresponding to the application obtained by the PCF from the UDR.
  • S203 The first network device sends the identification information of at least one first access location to the second network device.
  • the identification information of the first access location may be subnet information and/or a data network access identifier (DNAI).
  • the subnet information is the post-NAT public network IP address range corresponding to the candidate UPF.
  • the subnet information is the range of the IPv6 address or prefix corresponding to the candidate UPF.
  • the first network device may also determine the priority information corresponding to each of the at least one first access location, and send the priority information to the DNS AF.
  • the priority information of each first access location may be determined according to various factors such as the optimization degree of the routing path, the operator's strategy, and the network load. For example, the first access location with a shorter routing path corresponds to a higher priority.
  • the second network device determines the address of the server of the application according to the identification information of the at least one first access location.
  • the DNS AF determines the address of the application server can be divided into two scenarios, and the determination method is different in different scenarios. Specifically, see the following description:
  • Scenario 1 The network uses a local DNS server
  • DNS AF can select an access location from the above at least one first access location according to the local configuration and the first access location corresponding to the identification information of each first access location, and then Select the local DNS server corresponding to the access location.
  • the DNS AF may send a DNS request (request) message to the local DNS server, and the message may carry the APP FQDN.
  • the local DNS server may determine the address of the first application server, and return the address of the first application server to the second network device DNS AF.
  • the address of the first application server is the address of the application server that the UE finally accesses.
  • the DNS AF selects a first access location according to the local configuration, and determines the corresponding local DNS server. DNS AF sends DNS request information to the local DNS server. If the local DNS server returns a successful response, DNS AF determines that the server address carried in the response message is the address of the first application server, and the first access location is the second access location.
  • DNS AF selects a first access location for query.
  • the above-mentioned DNS request information may be referred to as fourth information.
  • the access location finally selected by the DNS AF may be referred to as the second access location.
  • the local DNS server is referred to as the second DNS server.
  • the DNS AF also needs to determine the subnet information according to the DNAI.
  • the DNS AF may select an access location from the at least one first access location according to the local configuration and priority information of the at least one first access location, and then select the local DNS server corresponding to the access location.
  • DNS AF determines the corresponding local DNS server according to the first access location with the highest priority, and sends DNS request information to the local DNS server. If the local DNS server returns a successful response, DNS AF determines the server address carried in the response message Is the address of the first application server, and this first access location is the second access location. If the local DNS server returns a failure response, DNS AF selects the first access location with the second highest priority for query according to the priority information.
  • Scenario 2 The network uses a centralized DNS server
  • the DNS AF may send a DNS request (request) message to the centralized DNS server, and the message may carry the identification information of the above-mentioned at least one first access location. Specifically, it can be carried by an enhanced DNS client subnet (ECS) option. If the identification information of the access location is subnet information, each ECS option may include the subnet information returned in S203. If the identification information of the aforementioned access location is DNAI, DNS AF needs to first determine the subnet information according to DNAI.
  • the above-mentioned DNS request information may be referred to as third information.
  • the centralized DNS server may be referred to as the first DNS server.
  • the first network device can also determine the priority information corresponding to each of the at least one first access location, and send the priority information to the DNS AF, the second information sent by the DNS AF to the centralized DNS server
  • the priority information corresponding to the at least one first access location may also be carried in the above.
  • the priority information sent by the first network device to the DNS AF may be referred to as first priority information
  • the priority information sent by the DNS AF to the centralized DNS server may be referred to as second priority information.
  • the centralized DNS server After the centralized DNS server receives the DNS request information, it can select some candidate application servers according to the configuration and the above-mentioned second priority information, and return the addresses of these candidate application servers to DNS AF, and DNS AF will use the above first
  • the priority information determines the address of the first application server.
  • the DNS AF selects the application server address with the highest priority from the returned candidate application server addresses as the first application server address, so that the first access location corresponding to the server address is the second access location.
  • the centralized DNS server may not make a preliminary selection, but directly determine the address of the application server corresponding to the at least one first access location.
  • the DNS AF may send data-oriented control execution (traffic steering control performing) request information to the first network device.
  • the PCF may further send the request information to the SMF.
  • the request information can be used to select a user plane network element for the UE to access the application.
  • the SMF may directly select the user plane network element for the UE to access the application according to the identification information of the candidate location determined by the SMF.
  • the request information may also carry identification information of the second access location, and the SMF selects the user plane of the access application for the UE according to the identification information of the second access location.
  • Network element the second access location is an access location finally selected from a plurality of candidate first access locations.
  • the SMF selects the finally selected identification information (DNAI or subnet information) of the second access location corresponding to the UPF as the PSA for the PDU session established by the UE according to the above request information. If the subnet information is IPv6 subnet information, the SMF allocates the corresponding IPv6 address prefix for the UE.
  • the DNS AF may also send a DNS response (response) message to the UE, where the response message carries the address of the first application server.
  • the UE may establish a connection with the first application server through the selected PSA, thereby communicating with the first application server.
  • SMF since SMF has configured the topology of the entire network, SMF can determine the candidate access location, which can better consider the current status of the network, simplify the configuration of DNS AF, and avoid the inconsistency of the server selected by DNS. When the usage occurs, the success rate of the UE accessing the application server is improved, and the network delay is reduced.
  • the embodiment of the application also supports DNS over HTTPS, and the UE sends DNS over HTTS request information to the DNS AF.
  • the embodiment of the application does not limit this.
  • the first network device involved in the embodiment of the present application may be an SMF or a PCF.
  • the discovery method of the application server provided in the embodiment of the present application, the following respectively introduces the detailed discovery method of the application server when the first network device is an SMF or a PCF.
  • FIG. 3 is a schematic flowchart of an application server discovery method provided in an embodiment of the present application when the first network device is an SMF. As shown in Figure 3, the method includes:
  • S301 The UE establishes a PDU session.
  • the UE establishes a PDU session, the network selects PSA, and assigns an IP address to the UE.
  • the SMF can obtain data-oriented control information (traffic steering control data) corresponding to the application.
  • the data-oriented control information may specifically include information used to identify data, a user plane access identifier indicating the access DN, and a data-oriented strategy corresponding to the DN configured on the UPF.
  • the information used to identify the data may be, for example, a triple of application data, APP ID, and so on.
  • the user plane access identifier indicating the access DN can be DNAI.
  • the data-oriented strategy corresponding to the configuration on the UPF may be a data routing profile ID (traffic steering profile ID).
  • the data-oriented control information may also include spatial validity conditions and temporal validity conditions.
  • the spatial validity condition can be used to indicate the UE position of the application data steering information (traffic steering information).
  • the time validity condition can be used to indicate the time when traffic steering information is applied, and the time validity condition is usually a time interval.
  • S302 The UE sends DNS request information to the DNS AF.
  • the UE can send request information (DNS Request) to DNS AF, which can carry the FQDN of the application and is used to request the server of the application the address of.
  • DNS Request request information
  • the request information may be referred to as fifth information.
  • the DNS AF sends the first information to the SMF.
  • the DNS AF can check whether the application has an SLA based on the FQDN. If it exists, the DNS AF sends the application's preferred access location information request to the SMF.
  • the request may be referred to as the first information.
  • the first information may include APP ID.
  • the first information may also include the IP address of the UE, and the address may be an IPv4 address or an IPv6 address.
  • the SMF obtains data-oriented control information corresponding to the application from the UDR.
  • the SMF can determine the UE according to the IP address of the UE. If the SMF does not obtain the data-oriented control information corresponding to the application in S301, the SMF can interact with the UDR to obtain the data-oriented control information corresponding to the application stored in the UDR. Or the SMF can interact with the PCF to obtain the data-oriented control information corresponding to the application obtained by the PCF from the UDR.
  • the SMF determines at least one first access location at least according to the first information.
  • the SMF may determine at least one first access location according to at least one of the following: application of corresponding data-oriented control information, current location information of the UE, operator policies, current network load conditions, and so on.
  • the SMF can determine the applicable DNAI based on information such as the current time and the current location of the UE. In addition, SMF can also determine the applicable DNAI based on the operator's strategy (for example, the operator has configured a data-oriented application for this application) and the current network load.
  • the first access location is a candidate access location for the UE to access the application, that is, the UE can access the DN through the UPF corresponding to the access location, and the application server corresponding to the application is deployed in the DN.
  • the access location for the UE to access the application is one of the foregoing multiple first access locations.
  • the SMF will select the above UPF as the PDU Session Anchor (PSA) for the PDU session established by the UE.
  • PSA PDU Session Anchor
  • the access location can be used to determine the UPF for the UE to access the application.
  • the identification information of the first access location may be a subnet address and/or DNAI.
  • the subnet information is the post-NAT public network IP address range corresponding to the candidate UPF.
  • the subnet information is the range of the IPv6 address or prefix corresponding to the candidate UPF.
  • the SMF sends the identification information of at least one first access location to the DNS AF.
  • the DNS AF can determine the address of the application server according to the identification information of the at least one first access location.
  • the identification information of the first access location may be subnet information and/or DNAI.
  • the SMF may also determine the priority information corresponding to each of the at least one first access location, and send the priority information to the DNS AF.
  • the priority information of each first access location may be determined according to various factors such as the optimization degree of the routing path, the operator's strategy, and the network load. For example, the first access location with a shorter routing path corresponds to a higher priority.
  • DNS AF determines the address of the application server can be divided into two scenarios, and the determination method is different in different scenarios. Specifically, see the following description:
  • Scenario 1 The network uses a local DNS server (S307-S309)
  • the DNS AF may select an access location from the foregoing at least one first access location according to the local configuration, and then select the local DNS server corresponding to the access location.
  • the DNS AF may send a DNS request (request) message to the local DNS server, and the message may carry the APP FQDN.
  • the above DNS request information may be referred to as fourth information.
  • the access location finally selected by the DNS AF may be referred to as the second access location.
  • the local DNS server is referred to as the second DNS server.
  • the DNS AF also needs to determine the subnet information according to the DNAI.
  • the DNS AF selects a first access location according to the local configuration, and determines the corresponding local DNS server.
  • DNS AF sends DNS request information to the local DNS server. If the local DNS server returns a successful response, DNS AF determines that the server address carried in the response message is the address of the first application server, and this first access location is the second access location. If the local DNS server returns a failure response, DNS AF selects a first access location for query.
  • the DNS AF may select an access location from the at least one first access location according to the local configuration and priority information of the at least one first access location, and then select the local DNS server corresponding to the access location.
  • DNS AF determines the corresponding local DNS server according to the first access location with the highest priority, and sends DNS request information to the local DNS server. If the local DNS server returns a successful response, DNS AF determines the server address carried in the response message Is the address of the first application server, and this first access location is the second access location. If the local DNS server returns a failure response, DNS AF selects the first access location with the second highest priority for query according to the priority information.
  • the local DNS server determines the address of the first application server.
  • the local DNS server determines the address of the first application server, and the address of the first application server is the address of the application server that the UE finally accesses.
  • the local DNS server sends the address of the first application server to DNS AF.
  • the local DNS server may return a response message to the DNS AF, and the response message may carry the address of the above-mentioned first application server.
  • Scenario 2 The network uses a centralized DNS server (S310-S313)
  • the DNS AF sends the third information to the centralized DNS server.
  • the DNS AF may send a DNS request (request) message to the centralized DNS server, and the message may carry the identification information of the at least one first access location. Specifically, it can be carried by ECS options. If the identification information of the aforementioned access location is subnet information, each ECS option can include the subnet information returned in S306. If the identification information of the aforementioned access location is DNAI, DNS AF needs to first determine the subnet information according to DNAI.
  • the above-mentioned DNS request information may be referred to as third information.
  • the centralized DNS server may be referred to as the first DNS server.
  • the SMF can also determine the priority information corresponding to the at least one first access location, and send the priority information to the DNS AF
  • the third information sent by the DNS AF to the centralized DNS server can also be included. Carry the priority information corresponding to each of the at least one first access location.
  • the priority information sent by the SMF to the DNS AF may be referred to as the first priority information
  • the priority information sent by the DNS AF to the centralized DNS server may be referred to as the second priority information.
  • the centralized DNS server preliminarily selects at least one application server.
  • the centralized DNS server can select some candidate application servers according to the configuration and the above-mentioned second priority information.
  • the DNS AF selects the application server address with the highest priority from the returned candidate application server addresses as the first application server address, so that the first access location corresponding to the server address is the second access location.
  • the centralized DNS server may not make a preliminary selection, but directly determine the address of the application server corresponding to the at least one first access location.
  • S312 The centralized DNS server sends the address of at least one application server to the DNS AF.
  • the centralized DNS server may send the determined address of at least one candidate application server to the DNS AF, so that the DNS AF further selects the application server that the UE finally accesses from the candidate application servers.
  • the identification information of the access location sent by the SMF to the DNS AF may be different from the identification information of the access location sent by the DNS AF to the centralized DNS server or the local DNS server.
  • the identification information of the access location sent by the SMF to the DNS AF may be referred to as the first identification information
  • the identification information of the access location sent by the DNS AF to the centralized DNS server or the local DNS server may be referred to as The second identification information.
  • the DNS AF may map the first identification information to the second identification information.
  • the first identification information may be the first DNAI and/or the first subnet information.
  • the second identification information may be the second DNAI and/or the second subnet information.
  • the second DNAI may be determined based on the first DNAI, and the second subnet information may be determined based on the first DNAI or the first subnet information.
  • DNS AF can map DNAI to subnet information.
  • the DNS AF determines the address of the first server from the addresses of at least one application server.
  • the DNS AF may be determined according to the priority information of the first access location corresponding to the address of the candidate application server.
  • S314 DNS AF sends request information to SMF.
  • the DNS AF sends data-oriented control execution (traffic steering control performing) request information to the SMF, and the request information may be used to select a user plane network element for the UE to access the application.
  • data-oriented control execution traffic steering control performing
  • the SMF may directly select the user plane network element for the UE to access the application according to the identification information of the determined candidate location.
  • the request information may also carry identification information of the second access location, and the SMF selects the user plane of the access application for the UE according to the identification information of the second access location.
  • Network element is an access location finally selected from a plurality of candidate first access locations.
  • S315 SMF is inserted into PSA.
  • the SMF selects the finally selected UPF corresponding to the identification information (DNAI or subnet information) of the second access location as the PSA for the PDU session established by the UE according to the above request information. If the subnet information is IPv6 subnet information, the SMF allocates the corresponding IPv6 address prefix for the UE.
  • the DNS AF sends the address of the first application server to the UE.
  • the DNS AF may send a DNS response (response) message to the UE, and the response message carries the address of the first application server.
  • the UE may establish a connection with the first application server through the selected PSA, thereby communicating with the first application server.
  • SMF since SMF has configured the topology of the entire network, SMF can determine the candidate access location, which can better consider the current status of the network, simplify the configuration of DNS AF, and avoid the inconsistency of the server selected by DNS. When the usage occurs, the success rate of the UE accessing the application server is improved, and the network delay is reduced.
  • FIG. 4 is a schematic flowchart of an application server discovery method provided in an embodiment of the present application when the first network device is a PCF. As shown in Figure 4, the method includes:
  • S401 The UE establishes a PDU session.
  • the UE establishes a PDU session, the network selects PSA, and assigns an IP address to the UE.
  • the PCF may obtain data-oriented control information (traffic steering control data) corresponding to the application.
  • the data-oriented control information may specifically include information for identifying data, a user plane access identifier indicating the access DN, and a data-oriented strategy corresponding to the DN configured on the UPF.
  • the information used to identify the data may be, for example, a triplet of application data, APP ID, and so on.
  • the user plane access identifier indicating the access DN can be DNAI.
  • the data-oriented strategy corresponding to the configuration on the UPF may be a data routing profile ID (traffic steering profile ID).
  • the data-oriented control information may also include spatial validity conditions and temporal validity conditions.
  • the spatial validity condition can be used to indicate the UE position of the application data steering information (traffic steering information).
  • the time validity condition can be used to indicate the time when LAN traffic steering information is applied, and the time validity condition is usually a time interval.
  • S402 The UE sends DNS request information to the DNS AF.
  • S402 is the same as S302, and will not be repeated here.
  • the DNS AF can check whether the application has a service layer agreement (SLA) based on the FQDN. If it exists, the DNS AF sends the application's preferred access location information request to the PCF.
  • the request may be referred to as the first information.
  • the first information may include APP ID.
  • the first information may also include the IP address of the UE, and the address may be an IPv4 address or an IPv6 address.
  • the PCF may send the second information to the SMF.
  • the second information may be used to request the UE to access the access location of the application.
  • the second information may carry a data-oriented control policy (traffic steering control policy), and the policy may include information such as APP ID and DNAI list.
  • the PCF itself can determine candidate access location information. If the PCF fails to obtain the data-oriented control information corresponding to the application in S401, the PCF can interact with the UDR to obtain the data-oriented control information corresponding to the application stored in the UDR.
  • the PCF can specify a data-oriented control strategy based on the oriented control information, which can include APP ID, DNAI list and other information.
  • the PCF itself cannot determine the candidate access location information as an example for description.
  • the SMF obtains data-oriented control information corresponding to the application from the PCF.
  • the SMF can interact with the PCF to obtain the data-oriented control information corresponding to the application. Further, the PCF can interact with the UDR to obtain data-oriented control information corresponding to the application stored in the UDR.
  • the SMF determines at least one first access location at least according to the first information.
  • S406 is the same as S305, and will not be repeated here.
  • the SMF sends the identification information of at least one first access location to the PCF.
  • the SMF may send a response message to the PCF, and the response message may carry the identification information of the at least one first access location.
  • the identification information can be subnet information and/or DNAI.
  • the subnet information may be IPv4 subnet information or IPv6 subnet information.
  • the PCF sends the identification information of at least one first access location to the DNS AF.
  • the PCF may send a response message to the DNS AF, and the response message may carry the identification information of the at least one first access location.
  • the DNS AF determines the address of the application server can also be divided into two scenarios, and the determination method is different in different scenarios. Specifically, see the following description:
  • Scenario 1 The network uses a local DNS server (S409-S411)
  • S409 The DNS AF sends the fourth information to the local DNS server.
  • S409 is the same as S307, and will not be repeated here.
  • S410 The local DNS server determines the address of the first application server.
  • S4010 is the same as S308, and will not be repeated here.
  • S411 The local DNS server sends the address of the first application server to DNS AF.
  • S411 is the same as S309, and will not be repeated here.
  • Scenario 2 The network uses a centralized DNS server (S412-S415)
  • S412 The DNS AF sends the third information to the centralized DNS server.
  • S412 is the same as S310, and will not be repeated here.
  • the centralized DNS server preliminarily selects at least one application server.
  • S413 is the same as S311, and will not be repeated here.
  • S414 The centralized DNS server sends the address of at least one application server to the DNS AF.
  • S414 is the same as S312, and will not be repeated here.
  • S415 The DNS AF determines the address of the first server from the addresses of at least one application server.
  • S415 is the same as S313, and will not be repeated here.
  • S416 DNS AF sends request information to PCF.
  • the DNS AF sends a data-oriented control execution (traffic steering control performing) request information to the PCF.
  • the request information may be used to select a user plane network element for the UE to access the application, and the request information may carry the APP ID.
  • the request information may also carry identification information of the second access location, such as DNAI and/or subnet information.
  • S417 PCF sends request information to SMF.
  • the PCF sends a data-oriented control performing (traffic steering control performing) request information to the SMF.
  • the request information may be used to select a user plane network element for the UE to access the application, and the request information may carry the APP ID.
  • the SMF may directly select the user plane network element for the UE to access the application according to the identification information of the determined candidate location.
  • the request information may also carry identification information of the second access location, and the PCF selects the user plane of the access application for the UE according to the identification information of the second access location.
  • Network element is an access location finally selected from a plurality of candidate first access locations.
  • S418 is the same as S315, and will not be repeated here.
  • the DNS AF sends the address of the first application server to the UE.
  • S419 is the same as S316, and will not be repeated here.
  • SMF since SMF has configured the topology of the entire network, SMF can determine the candidate access location, which can better consider the current status of the network, simplify the configuration of DNS AF, and avoid the inconsistency of the server selected by DNS. When the usage occurs, the success rate of the UE accessing the application server is improved, and the network delay is reduced.
  • FIG. 5 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • the network device can be used to execute the steps performed by the first network device in the method for discovering an application server provided by this application.
  • the network device 50 may at least include: a receiving unit 510, a determining unit 520, and a sending unit 530. in:
  • the receiving unit 510 is configured to receive first information sent by a second network device, where the first information includes an application identifier.
  • the determining unit 520 is configured to determine at least one first access location at least according to the first information, where the first access location is a candidate access location for the user equipment to access the application.
  • the sending unit 530 is configured to send the identification information of the at least one first access location to the second network device, and the identification information of the at least one first access location is used to determine the address of the server of the application.
  • the network device 50 is a session management network element.
  • the receiving unit 510 is further configured to receive request information sent by the second network device, where the request information is used to request the network device 50 to select a user plane network element for the user equipment to access the application.
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the determining unit 520 is specifically configured to determine the foregoing data based on at least one of data-oriented control information corresponding to the foregoing application, current location information of the foregoing user equipment, operator policies, and current network load conditions. At least one first access location.
  • the data-oriented control information corresponding to the above-mentioned application is obtained by the network device 50 from the unified data repository or the policy control network element.
  • the network device 50 is a policy control network element.
  • the determining unit 520 is specifically configured to: send second information to the session management network element, where the second information is used to request the user equipment to access the access location of the application; and receive information about the at least one access location sent by the session management network element. Identification information.
  • the identification information of the at least one first access location is directed by the session management network element according to the data-oriented control information corresponding to the application, the current location information of the user equipment, the operator policy, and the current network At least one of the load conditions is determined.
  • the network device 50 provides the above-mentioned session management network element with data-oriented control information corresponding to the above-mentioned application.
  • the receiving unit 510 is further configured to: receive request information from the second network device, where the request information is used to request the session management network element to select a user plane network element for the user equipment to access the application. .
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the identification information of the at least one first access location is at least one data network access identification DNAI and/or subnet information.
  • the aforementioned at least one DNAI is a DNAI corresponding to a user plane network element that can be used by the aforementioned user equipment to access the aforementioned application.
  • the at least one subnet information is subnet information corresponding to a user plane network element that the user equipment can use to access the application.
  • the foregoing subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the address of the server of the application is an address sent by the DNS server of the domain name system to the second network device.
  • the embodiment of the present application provides another network device.
  • FIG. 6, is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • the network device can be used to execute the steps performed by the second network device in the method for discovering application servers provided in this application.
  • the network device 60 may at least include: a sending unit 610, a receiving unit 620, and a determining unit 630. in:
  • the sending unit 610 is configured to send first information to the first network device, where the first information includes an application identifier.
  • the receiving unit 620 is configured to receive first identification information of at least one first access location sent by the first network device; the first access location is a candidate access location for the user equipment to access the application.
  • the determining unit 630 is configured to determine the address of the first server of the application according to the first identification information of the at least one first access location.
  • the determining unit 630 is specifically configured to: send third information to the first domain name system DNS server, and the third information includes at least one second identification information of the first access location, wherein the at least The second identification information of a first access location is determined according to the first identification information of the at least one first access location; corresponding to the second identification information of the at least one first access location sent by the first DNS server.
  • the address of at least one server of the aforementioned application; the address of the first server is determined from the address of the aforementioned at least one server.
  • the receiving unit 620 is further configured to: receive the first priority information of the first identification information of the at least one first access location sent by a network device.
  • the determining unit 630 is specifically configured to send third information to the first DNS server, where the third information includes second identification information of at least one first access location, wherein the second identification information of the at least one first access location Determined according to the first identification information of the at least one first access location; receiving at least one server address of the application corresponding to the second identification information of the at least one first access location sent by the first DNS server; At least one server address of the application corresponding to the priority information and the second identification information of the at least one first access location determines the address of the first server.
  • the third information further includes second priority information corresponding to the second identification information of the at least one first access location, wherein the second priority information is based on the first priority information Determine; the address of the at least one first server sent by the first DNS server is determined by the first DNS server according to the second priority information.
  • the determining unit 630 is specifically configured to: determine the second DNS server corresponding to the second access location according to the first identification information of the at least one first access location, and report to the second DNS server Send fourth information; the fourth information is used to obtain the address of the first server; the first identification information of the at least one first access location includes the first identification information of the second access location; the second network device Receiving the address of the first server sent by the second DNS server.
  • the receiving unit 620 is specifically configured to receive priority information corresponding to the first identification information of the at least one first access location sent by the first network device.
  • the determining unit 630 is specifically configured to: determine the second DNS server corresponding to the second access location according to the priority information corresponding to the first identification information of the at least one first access location, and send the foregoing second DNS server to the second DNS server. Fourth information.
  • the receiving unit 620 is further configured to receive fifth information sent by the user equipment, where the fifth information is used to request the address of the server of the application.
  • the sending unit 610 is further configured to send request information to the first network device, where the request information is used to request the first network device to select a user plane network element for the user equipment to access the application. .
  • the request information further includes first identification information of the second access location, the at least one first access location includes the second access location, and the second access location corresponds to the first access location.
  • the address of a server The address of a server.
  • the sending unit 610 is further configured to send the address of the first server to the user equipment.
  • the first identification information of the at least one first access location is at least one first data network access identification DNAI and/or first subnet information.
  • the at least one first DNAI is a DNAI corresponding to a user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information is the subnet information corresponding to the user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the second identification information of the at least one first access location is at least one second DNAI and/or second subnet information, wherein the at least one second DNAI is based on the at least one first access location.
  • the DNAI determines that the at least one second subnet information is based on the at least one first DNAI or the first subnet information.
  • FIG. 7 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • the communication system can be used to implement the methods shown in FIG. 2, FIG. 3, and FIG. 4.
  • the communication system includes:
  • the first network device 710 is configured to receive first information of the second network device 720, where the first information includes an application identifier.
  • the first network device 710 is further configured to determine at least one first access location at least according to the first information, where the first access location is a candidate access location for the user equipment to access the application.
  • the first network device 710 is further configured to send the first identification information of the at least one first access location to the second network device 720.
  • the second network device 720 is configured to determine the address of the first server of the application according to the first identification information of the at least one first access location.
  • the first network device 710 is a session management network element.
  • the first network device 710 is further configured to receive request information sent by the second network device 720, where the request information is used to request the first network device 710 to select a user plane network element for the user equipment to access the application.
  • the request information further includes identification information of the second access location, and the at least one access location includes the second access location.
  • the first network device 710 is specifically configured to: guide control information according to the data corresponding to the above-mentioned application, the current location information of the above-mentioned user equipment, the operator policy, and the current network load status. This determines the above-mentioned at least one first access location.
  • the data-oriented control information corresponding to the above-mentioned application is obtained by the first network device 710 from the unified data repository or the policy control network element.
  • the first network device 710 is a policy control network element.
  • the first network device 710 is specifically configured to: send second information to the session management network element, and the second request is used to request the user equipment to access the access location of the application; and receive the at least one interface sent by the session management network element.
  • the identification information of the incoming location is specifically configured to: send second information to the session management network element, and the second request is used to request the user equipment to access the access location of the application; and receive the at least one interface sent by the session management network element.
  • the identification information of the at least one first access location is directed by the session management network element according to the data-oriented control information corresponding to the application, the current location information of the user equipment, the operator policy, and the current network At least one of the load conditions is determined.
  • the first network device 710 provides the above-mentioned session management network element with data-oriented control information corresponding to the above-mentioned application.
  • the request information further includes identification information of the second access location, and the at least one first access location includes the second access location.
  • the second network device 720 is specifically configured to: send third information to the first domain name system DNS server, where the third information includes at least one second identification information of the first access location, The second identification information of the at least one first access location is determined according to the first identification information of the at least one first access location; the second identification information of the at least one first access location sent by the first DNS server is received The address of at least one server of the aforementioned application corresponding to the information; the address of the first server is determined from the address of the aforementioned at least one server.
  • the first network device 710 is further configured to send the first priority information of the first identification information of the at least one first access location to the second network device 720.
  • the second network device 720 is specifically configured to send third information to the first DNS server, where the third information includes second identification information of at least one first access location, and the second identification information of the at least one first access location is 2.
  • the identification information is determined according to the first identification information of the at least one first access location; receiving at least one server address of the application corresponding to the second identification information of the at least one first access location sent by the first DNS server;
  • the address of the first server is determined according to the at least one server address of the application corresponding to the first priority information and the second identification information of the at least one first access location.
  • the third information further includes second priority information corresponding to the second identification information of the at least one first access location, wherein the second priority information is based on the first priority information Determine; the address of the at least one first server sent by the first DNS server is determined by the first DNS server according to the second priority information.
  • the second network device 720 is specifically configured to: determine the second DNS server corresponding to the second access location according to the first identification information of the at least one first access location, and report to the first access location. 2.
  • the DNS server sends fourth information; the fourth information is used to obtain the address of the first server; the first identification information of the at least one first access location includes the first identification information of the second access location;
  • the second network device receives the address of the first server sent by the second DNS server.
  • the first network device 710 is further configured to send priority information corresponding to the first identification information of the at least one first access location to the second network device 720.
  • the second network device 720 is specifically configured to: determine the second DNS server corresponding to the second access location according to the priority information corresponding to the first identification information of the at least one first access location, and report to the second DNS server The server sends the above-mentioned fourth information.
  • the second network device 720 is further configured to receive fifth information sent by the user equipment, and the fifth information is used to request the address of the server of the application.
  • the second network device 720 is further configured to send the address of the first server to the user equipment.
  • the first identification information of the one or more access locations is one or more first data network access identification DNAI and/or first subnet information.
  • the at least one first DNAI is a DNAI corresponding to a user plane network element that the user equipment can use to access the application.
  • the at least one first subnet information is subnet information corresponding to a user plane network element that the user equipment can use to access the application.
  • the one or more first subnet information includes IPv6 subnet information or IPv4 subnet information.
  • the second identification information of the at least one first access location is at least one second DNAI and/or second subnet information, wherein the at least one second DNAI is based on the at least one first access location.
  • the DNAI determines that the at least one second subnet information is based on the at least one first DNAI or the first subnet information.
  • FIG. 8 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • the network device can be used as the first network device or the second network device.
  • the network device refer to the methods shown in FIG. 2, FIG. 3, and FIG. 4.
  • the network device 80 includes at least one processor 820, configured to implement the functions of the first network device or the second network device in the method provided in the embodiment of the present application, and the network device 80 may also include a transceiver 810.
  • the transceiver can be used to communicate with other devices through the transmission medium.
  • the processor 820 uses the transceiver 810 to send and receive data (such as sending and receiving messages, etc.), and is used to implement the method described in the foregoing method embodiment.
  • the network device 80 may further include at least one memory 830 for storing program instructions and/or data.
  • the memory 830 and the processor 820 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 820 may cooperate with the memory 830 to operate.
  • the processor 820 may execute program instructions stored in the memory 830.
  • the specific connection medium between the above-mentioned transceiver 810, the processor 820, and the memory 830 is not limited in the embodiment of the present application.
  • the memory 830, the processor 820, and the transceiver 810 are connected by a bus 840 in FIG. 8.
  • the bus is represented by a thick line in FIG. , Is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and so on. For ease of representation, only one thick line is used in FIG. 8, but it does not mean that there is only one bus or one type of bus.
  • the processor 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 Perform the methods, steps, and logic block diagrams disclosed in the embodiments of the present application.
  • 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 in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM
  • the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes FIG. 2 and/or FIG. 3 and/or the method in the embodiment shown in FIG. 4.
  • the present application also provides a computer-readable medium storing program code, which when the program code runs on a computer, causes the computer to execute FIG. 2 and/or FIG. 3 and/or the method in the embodiment shown in FIG. 4.
  • the present application also provides a computer program that can be used to execute the method in the embodiment shown in FIG. 2 and/or FIG. 3 and/or FIG. 4.
  • 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, 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.
  • 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 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 high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disc), SSD)) etc.
  • component used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution.
  • the component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, and/or a computer running on a processor.
  • the application running on the computing device and the computing device can be components.
  • One or more components may reside in processes and/or threads of execution, and components may be located on one computer and/or distributed between two or more computers.
  • these components can be executed from various computer readable media having various data structures stored thereon.
  • the component can be based on, for example, a signal having one or more data packets (e.g. data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through a signal) Communicate through local and/or remote processes.
  • a signal having one or more data packets (e.g. data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through a signal) Communicate through local and/or remote processes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

本申请实施例提供了一种应用服务器的发现方法及相关装置。该方法包括：第一网络设备接收第二网络设备的第一信息，第一信息包括应用的标识；第一网络设备至少根据第一信息确定至少一个第一接入位置，第一接入位置为用户设备访问该应用的候选接入位置；第一网络设备将上述至少一个第一接入位置的标识信息发送给第二网络设备；第二网络设备根据上述至少一个第一接入位置的标识信息确定上述应用的服务器的地址。实施本申请，可以简化DNS AF的配置。

Description

应用服务器的发现方法及相关装置
本申请要求于2020年03月31日提交中国专利局、申请号为202010247659.2、申请名称为“应用服务器的发现方法及相关装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及移动通信领域，尤其涉及一种应用服务器的发现方法及相关装置。
背景技术
在第五代(5th-generation，5G)通信系统中，用户设备(user equipment，UE)接入网络后建立协议数据单元(protocol data unit，PDU)会话，并通过PDU会话访问外部数据网络(data network，DN)，与部署在DN中的应用服务器交互。同一个应用的应用服务器可以部署在多个位置，这样网络就可以根据UE的接入位置，选择靠近UE同时又支持UE访问DN的PDU会话锚点(PDU session anchor，PSA)，以减少路由迂回，降低网络延迟。
UE若要访问应用服务器，需要通过域名系统(domain name system，DNS)应用功能(application function，AF)查询UE的地址，根据UE的地址确定优选的接入位置，再根据接入位置查询DNS服务器来获取应用服务器的地址。这样导致DNS AF配置复杂。
发明内容
本申请实施例提供了一种应用服务器的发现方法及相关装置，可以简化DNS AF配置。
第一方面，本申请实施例提供了一种应用服务器的发现方法，该方法包括：第一网络设备接收第二网络设备的第一信息，上述第一信息包括应用的标识；上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，上述第一接入位置为用户设备访问上述应用的候选接入位置；上述第一网络设备将上述至少一个第一接入位置的标识信息发送给上述第二网络设备，上述至少一个第一接入位置的标识信息用于上述应用的服务器的地址的确定。
本申请实施例中，第二网络设备为DNS AF，应用的候选接入位置可以由第一网络设备决定并发送给第二网络设备，以使第二网络设备根据候选的接入位置的标识信息确定应用的服务器的地址。实施本申请实施例，可以简化DNS AF的配置。此外，第一网络设备可以确定至少一个候选接入位置，提高DNS最终选择的应用的服务器的可靠性。
在一种可能的实现方式中，上述第一网络设备为会话管理网元；上述方法还包括：上述第一网络接收上述第二网络设备发送的请求信息，上述请求信息用于请求上述第一网络设备为上述用户设备选择访问上述应用的用户面网元。
本申请实施例中，第一网络设备为会话管理网元(session management function，SMF)，由于SMF已配置整个网络的拓扑结构，由SMF来确定候选的接入位置，可以就近为UE选择应用服务器。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少 一个第一接入位置包括上述第二接入位置。
本申请实施例中，当候选的接入位置不唯一时，第二网络设备可以将接入位置的标识信息携带在请求信息中，以供第一网络设备根据标识信息为用户设备选择访问应用的用户面网元。
在一种可能的实现方式中，上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，包括：上述第一网络设备根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定上述至少一个第一接入位置。
本申请实施例中，SMF可以根据应用对应的数据导向控制信息、用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种来综合确定候选的接入位置，这样可以提高最终选择的用户面网元的成功率，减少路由迂回，降低网络延迟。
在一种可能的实现方式中，上述应用对应的数据导向控制信息由上述第一网络设备从统一数据存储库或策略控制网元获取。
在一种可能的实现方式中，上述第一网络设备为策略控制网元；上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，包括：上述第一网络设备向会话管理网元发送第二信息，上述第二信息用于请求上述用户设备访问上述应用的接入位置；上述第一网络设备接收上述会话管理网元发送的上述至少一个接入位置的标识信息。
本申请实施例中，第一网络设备为策略控制网元(policy control function，PCF)，由PCF向SMF发起第三信息，再由SMF确定候选的接入位置发送给PCF。由于SMF已配置整个网络的拓扑结构，由SMF来确定候选的接入位置，可以就近为UE选择应用服务器。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息由上述会话管理网元根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
本申请实施例中，SMF可以根据应用对应的数据导向控制信息、用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种来综合确定候选的接入位置，这样可以提高最终选择的用户面网元的成功率，减少路由迂回，降低网络延迟。
在一种可能的实现方式中，上述第一网络设备向上述会话管理网元提供上述应用对应的数据导向控制信息。
在一种可能的实现方式中，上述方法还包括：上述第一网络设备接收上述第二网络设备的请求信息，上述请求信息用于请求上述会话管理网元为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
本申请实施例中，当候选的接入位置不唯一时，第二网络设备可以将接入位置的标识信息携带在请求信息中，以供第一网络设备根据标识信息为用户设备选择访问应用的用户面网元。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息为至少一个数据网络接入标识DNAI和/或子网信息。
在一种可能的实现方式中，上述至少一个DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述至少一个子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述应用的服务器的地址为域名系统DNS服务器向上述第二网络设备发送的地址。
第二方面，本申请实施例提供了一种应用服务器的发现方法，包括：第二网络设备向第一网络设备发送第一信息，上述第一信息包括应用的标识；上述第二网络设备接收上述第一网络设备发送的至少一个第一接入位置的第一标识信息；上述第一接入位置为用户设备访问上述应用的候选接入位置；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址。
本申请实施例中，第二网络设备为DNS AF，应用的候选接入位置可以由第一网络设备决定并发送给第二网络设备，以使第二网络设备根据候选的接入位置的标识信息确定应用的服务器的地址。实施本申请实施例，可以简化DNS AF的配置。此外，第一网络设备可以确定至少一个候选接入位置，提高DNS最终选择的应用的服务器的可靠性。
在一种可能的实现方式中，上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备向第一域名系统DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；上述第二网络设备接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器的地址；上述第二网络设备从上述至少一个服务器的地址中确定第一服务器的地址。
本申请实施例中，第一DNS服务器是集中式DNS服务器，由DNS AF将至少一个候选的接入位置的标识信息发送给DNS服务器，DNS服务器返回至少一个候选的接入位置对应的应用服务器。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备接收上述的一网络设备发送的上述至少一个第一接入位置的第一标识信息的第一优先级信息；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备向第一DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；上述第二网络设备接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址；上述第二网络设备根据上述第一优先级信息和上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址确定上述第一服务器的地址。
本申请实施例中，第二网络设备可以根据候选的接入位置的优先级信息，选择性能较优的至少一个应用服务器，使用户设备可以快速接入应用服务器，减少网络延时。
在一种可能的实现方式中，上述第三信息还包括上述至少一个第一接入位置的第二标 识信息对应的第二优先级信息，其中上述第二优先级信息根据上述第一优先级信息确定；上述第一DNS服务器发送的上述至少一个第一服务器的地址由上述第一DNS服务器根据上述第二优先级信息确定。
本申请实施例中，集中式DNS服务器可以根据优先级信息对至少一个候选的接入位置进行初步筛选，再由第二网络设备根据优先级信息对集中式DNS服务器返回的一个或多个应用服务器进行筛选，使用户设备可以快速接入应用服务器，减少网络延时。
在一种可能的实现方式中，上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息；上述第四信息用于获取上述第一服务器的地址；上述至少一个第一接入位置的第一标识信息包括上述第二接入位置的第一标识信息；上述第二网络设备接收上述第二DNS服务器发送的上述第一服务器的地址。
本申请实施例中，第二DNS服务器是本地DNS服务器，由DNS AF从至少一个候选的接入位置中选择一个接入位置，并将该接入位置的标识信息发送给对应的本地DNS服务器，由该本地DNS服务器确定最终的应用服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备接收上述第一网络设备发送的上述至少一个第一接入位置的第一标识信息对应的优先级信息；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息，包括：上述第二网络设备根据上述至少一个第一接入位置的第一标识信息对应的优先级信息确定上述第二接入位置对应的上述第二DNS服务器，并向上述第二DNS服务器发送上述第四信息。
本申请实施例中，DNS AF根据候选接入位置的优先级选择第二接入位置，选择当前最优的接入位置，使用户设备可以快速接入应用服务器，减少网络延时。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备接收上述用户设备发送的第四信息，上述第四信息用于请求上述应用的服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备向上述第一网络设备发送请求信息，上述请求信息用于请求上述第一网络设备为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的第一标识信息，上述至少一个第一接入位置包括上述第二接入位置，上述第二接入位置对应上述第一服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备向上述用户设备发送上述第一服务器的地址。
在一种可能的实现方式中，上述至少一个第一接入位置的第一标识信息为至少一个第一数据网络接入标识DNAI和/或第一子网信息。
在一种可能的实现方式中，上述至少一个第一DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述一个或多个第一子网信息为上述用户设备访问上述应 用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述一个或多个第一子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中上述至少一个第二DNAI根据上述至少一个第一DNAI确定，上述至少一个第二子网信息根据上述至少一个第一DNAI或第一子网信息。
第三方面，本申请实施例提供了一种应用服务器的发现方法，包括：第一网络设备接收第二网络设备的第一信息，上述第一信息包括应用的标识；上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，上述第一接入位置为用户设备访问上述应用的候选接入位置；上述第一网络设备将上述至少一个第一接入位置的第一标识信息发送给上述第二网络设备；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址。
在一种可能的实现方式中，上述第一网络设备为会话管理网元；上述方法还包括：上述第一网络设备接收上述第二网络设备发送的请求信息，上述请求信息用于请求上述第一网络设备为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个接入位置包括上述第二接入位置。
在一种可能的实现方式中，上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，包括：上述第一网络设备根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定上述至少一个第一接入位置。
在一种可能的实现方式中，上述应用对应的数据导向控制信息由上述第一网络设备从统一数据存储库或策略控制网元获取。
在一种可能的实现方式中，上述第一网络设备为策略控制网元；上述第一网络设备至少根据上述第一信息确定至少一个第一接入位置，包括：上述第一网络设备向会话管理网元发送第二信息，上述第二信息用于请求上述用户设备访问上述应用的接入位置；上述第一网络设备接收上述会话管理网元发送的上述至少一个接入位置的标识信息。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息由上述会话管理网元根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
在一种可能的实现方式中，上述第一网络设备向上述会话管理网元提供上述应用对应的数据导向控制信息。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备向第一域名系统DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信 息确定；上述第二网络设备接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器的地址；上述第二网络设备从上述至少一个服务器的地址中确定第一服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第一网络设备将上述至少一个第一接入位置的第一标识信息的第一优先级信息发送给上述第二网络设备；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备向第一DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；上述第二网络设备接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址；上述第二网络设备根据上述第一优先级信息和上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址确定上述第一服务器的地址。
在一种可能的实现方式中，上述第三信息还包括上述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中上述第二优先级信息根据上述第一优先级信息确定；上述第一DNS服务器发送的上述至少一个第一服务器的地址由上述第一DNS服务器根据上述第二优先级信息确定。
在一种可能的实现方式中，上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址，包括：上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息；上述第四信息用于获取上述第一服务器的地址；上述至少一个第一接入位置的第一标识信息包括上述第二接入位置的第一标识信息；上述第二网络设备接收上述第二DNS服务器发送的上述第一服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第一网络设备将上述至少一个第一接入位置的第一标识信息对应的优先级信息发送给上述第二网络设备；上述第二网络设备根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息，包括：上述第二网络设备根据上述至少一个第一接入位置的第一标识信息对应的优先级信息确定上述第二接入位置对应的上述第二DNS服务器，并向上述第二DNS服务器发送上述第四信息。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备接收上述用户设备发送的第五信息，上述第五信息用于请求上述应用的服务器的地址。
在一种可能的实现方式中，上述方法还包括：上述第二网络设备向上述用户设备发送上述第一服务器的地址。
在一种可能的实现方式中，上述一个或多个接入位置的第一标识信息为一个或多个第一数据网络接入标识DNAI和/或第一子网信息。
在一种可能的实现方式中，上述至少一个第一DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述至少一个第一子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述一个或多个第一子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中上述至少一个第二DNAI根据上述至少一个第一DNAI确定，上述至少一个第二子网信息根据上述至少一个第一DNAI或第一子网信息。
第三方面的有益效果可参见第一方面及第二方面的有益效果，在此不赘述。
第四方面，本申请实施例提供了一种网络设备，包括：接收单元，用于接收第二网络设备发送的第一信息，上述第一信息包括应用的标识；确定单元，用于至少根据上述第一信息确定至少一个第一接入位置，上述第一接入位置为用户设备访问上述应用的候选接入位置；发送单元，用于将上述至少一个第一接入位置的标识信息发送给上述第二网络设备，上述至少一个第一接入位置的标识信息用于上述应用的服务器的地址的确定。
在一种可能的实现方式中，上述网络设备为会话管理网元；上述接收单元还用于：接收上述第二网络设备发送的请求信息，上述请求信息用于请求上述网络设备为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，上述确定单元具体用于：根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定上述至少一个第一接入位置。
在一种可能的实现方式中，上述应用对应的数据导向控制信息由上述网络设备从统一数据存储库或策略控制网元获取。
在一种可能的实现方式中，上述网络设备为策略控制网元；上述确定单元具体用于：向会话管理网元发送第二信息，上述第二信息用于请求上述用户设备访问上述应用的接入位置；接收上述会话管理网元发送的上述至少一个接入位置的标识信息。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息由上述会话管理网元根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
在一种可能的实现方式中，上述网络设备向上述会话管理网元提供上述应用对应的数据导向控制信息。
在一种可能的实现方式中，上述接收单元还用于：接收上述第二网络设备的请求信息，上述请求信息用于请求上述会话管理网元为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息为至少一个数据网络接入标识DNAI和/或子网信息。
在一种可能的实现方式中，上述至少一个DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述至少一个子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述应用的服务器的地址为域名系统DNS服务器向上述第二网络设备发送的地址。
第四方面的有益效果可参见第一方面的有益效果，在此不赘述。
第五方面，本申请实施例提供了一种网络设备，包括：发送单元，用于向第一网络设备发送第一信息，上述第一信息包括应用的标识；接收单元，用于接收上述第一网络设备发送的至少一个第一接入位置的第一标识信息；上述第一接入位置为用户设备访问上述应用的候选接入位置；确定单元，用于根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址。
在一种可能的实现方式中，上述确定单元具体用于：向第一域名系统DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器的地址；从上述至少一个服务器的地址中确定第一服务器的地址。
在一种可能的实现方式中，上述接收单元还用于：接收上述的一网络设备发送的上述至少一个第一接入位置的第一标识信息的第一优先级信息；上述确定单元具体用于：向第一DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址；根据上述第一优先级信息和上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址确定上述第一服务器的地址。
在一种可能的实现方式中，上述第三信息还包括上述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中上述第二优先级信息根据上述第一优先级信息确定；上述第一DNS服务器发送的上述至少一个第一服务器的地址由上述第一DNS服务器根据上述第二优先级信息确定。
在一种可能的实现方式中，上述确定单元具体用于：根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息；上述第四信息用于获取上述第一服务器的地址；上述至少一个第一接入位置的第一标识信息包括上述第二接入位置的第一标识信息；上述第二网络设备接收上述第二DNS服务器发送的上述第一服务器的地址。
在一种可能的实现方式中，上述接收单元具体用于：接收上述第一网络设备发送的上述至少一个第一接入位置的第一标识信息对应的优先级信息；上述确定单元具体用于：根据上述至少一个第一接入位置的第一标识信息对应的优先级信息确定上述第二接入位置对应的上述第二DNS服务器，并向上述第二DNS服务器发送上述第四信息。
在一种可能的实现方式中，上述接收单元还用于：接收上述用户设备发送的第五信息， 上述第五信息用于请求上述应用的服务器的地址。
在一种可能的实现方式中，上述发送单元还用于：向上述第一网络设备发送请求信息，上述请求信息用于请求上述第一网络设备为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的第一标识信息，上述至少一个第一接入位置包括上述第二接入位置，上述第二接入位置对应上述第一服务器的地址。
在一种可能的实现方式中，上述发送单元还用于：向上述用户设备发送上述第一服务器的地址。
在一种可能的实现方式中，上述至少一个第一接入位置的第一标识信息为至少一个第一数据网络接入标识DNAI和/或第一子网信息。
在一种可能的实现方式中，上述至少一个第一DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述一个或多个第一子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述一个或多个第一子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中上述至少一个第二DNAI根据上述至少一个第一DNAI确定，上述至少一个第二子网信息根据上述至少一个第一DNAI或第一子网信息。
第五方面的有益效果可参见第二方面的有益效果，在此不赘述。
第六方面，本申请实施例提供了一种通信系统，该通信系统包括：第一网络设备及第二网络设备；第一网络设备为本申请实施例第四方面或第四方面的任意一种可能的实现方式提供的网络设备，第二网络设备为本申请实施例第五方面或第五方面的任意一种可能的实现方式提供的网络设备。
第六方面的有益效果可参见第一方面及第二方面的有益效果，在此不赘述。
第七方面，本申请实施例提供了一种网络设备，包括：处理器，当上述处理器调用存储器中的计算机程序时，第一方面或第一方面的任意一种实现方式上述的方法被执行。
第七方面的有益效果可参见第一方面的有益效果，在此不赘述。
第八方面，本申请实施例提供了一种网络设备，包括：处理器，当上述处理器调用存储器中的计算机程序时，如第二方面或第二方面的任意一种实现方式上述的方法被执行。
第八方面的有益效果可参见第二方面的有益效果，在此不赘述。
第九方面，本申请实施例提供了一种芯片，上述芯片包括至少一个处理器，存储器和接口电路，上述存储器、上述收发器和上述至少一个处理器通过线路互联，上述至少一个存储器中存储有指令；上述指令被上述处理器执行时，第一方面或第一方面的任意一种实现方式得以实现。
第九方面的有益效果可参见第一方面的有益效果，在此不赘述。
第十方面，本申请实施例提供了一种芯片，上述芯片包括至少一个处理器，存储器和 接口电路，上述存储器、上述收发器和上述至少一个处理器通过线路互联，上述至少一个存储器中存储有指令；上述指令被上述处理器执行时，第二方面或第二方面的任意一种实现方式得以实现。
第十方面的有益效果可参见第二方面的有益效果，在此不赘述。
第十一方面，本申请实施例提供了一种计算机可读存储介质，上述计算机可读存储介质中存储有指令，当其在计算机或处理器上运行时，本申请实施例第一方面或第一方面的任意一种实现方式提供的方法得以实现。
第十一方面的有益效果可参见第一方面的有益效果，在此不赘述。
第十二方面，本申请实施例提供了一种计算机可读存储介质，上述计算机可读存储介质中存储有指令，当其在计算机或处理器上运行时，本申请实施例第二方面或第二方面的任意一种实现方式提供的方法得以实现。
第十二方面的有益效果可参见第二方面的有益效果，在此不赘述。
第十三方面，本申请实施例提供了一种计算机程序产品，当其在网络设备上运行时，本申请实施例第一方面或第一方面的任意一种实现方式提供的方法得以实现。
第十三方面的有益效果可参见第一方面的有益效果，在此不赘述。
第十四方面，本申请实施例提供了一种计算机程序产品，当其在网络设备上运行时，本申请实施例第二方面或第二方面的任意一种实现方式提供的方法得以实现。
第十四方面的有益效果可参见第二方面的有益效果，在此不赘述。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例中所需使用的附图作简单地介绍。
图1为本申请实施例提供的一种网络架构示意图；
图2为本申请实施例提供的一种应用服务器的发现方法的流程示意图；
图3为本申请实施例提供的另一种应用服务器的发现方法的流程示意图；
图4为本申请实施例提供的另一种应用服务器的发现方法的流程示意图；
图5为本申请实施例提供的一种网络设备的结构示意图；
图6为本申请实施例提供的另一种网络设备的结构示意图；
图7为本申请实施例提供的一种通信系统的结构示意图；
图8为本申请实施例提供的又一种网络设备的结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于 这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上，“至少两个(项)”是指两个或三个及三个以上，“和/或”，用于描述关联对象的关联关系，表示可以存在三种关系，例如，“A和/或B”可以表示：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b或c中的至少一项(个)，可以表示：a，b，c，“a和b”，“a和c”，“b和c”，或“a和b和c”，其中a，b，c可以是单个，也可以是多个。
下面结合附图对本申请的实施例进行描述。
首先，介绍本申请实施例所涉及的网络架构。
本申请提供的应用处理器的发现方法可应用于各类通信系统中，例如，物联网(internet of things，IoT)系统、窄带物联网(narrow band internet of things，NB-IoT)系统、长期演进(long term evolution，LTE)系统，也可以是第五代(5th-generation，5G)通信系统，还可以是LTE与5G混合架构、也可以是5G新无线(new radio，NR)系统，以及未来通信发展中出现的新的通信系统等。
参见图1，图1是本申请实施例提供的一种网络架构示意图，图1中所涉及的各个部分如下所示：
终端设备110，也称为用户设备(user equipment，UE)、终端等。终端设备是一种具有无线收发功能的设备，可以经(无线)接入网络((radio)access network，(R)AN)120中的接入网设备与一个或多个核心网(core network，CN)进行通信。可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上，如轮船上等；还可以部署在空中，例如部署在飞机、气球或卫星上等。终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。
(无线)接入网络((radio)access network，(R)AN)120，用于为特定区域的授权终端设备提供入网功能，并能够根据终端设备的级别，业务的需求等使用不同质量的传输隧道。如(R)AN可管理无线资源，为终端设备提供接入服务，进而完成控制信息和/或数据信息在终端设备和核心网(core network，CN)之间的转发。
本申请实施例中的接入网设备是一种为终端设备提供无线通信功能的设备，也可称为网络设备。如该接入网设备可以包括：5G系统中的下一代基站节点(next generation node  basestation，gNB)、长期演进(long term evolution，LTE)中的演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(base band unit，BBU)、传输点(transmitting and receiving point，TRP)(或称为传输接收点)、发射点(transmitting point，TP)、小基站设备(pico)、移动交换中心，或者未来网络中的网络设备等。可理解，本申请实施例对接入网设备的具体类型不作限定。在不同无线接入技术的系统中，具备接入网设备功能的设备的名称可能会有所不同。
用户面功能网元(user plane function，UPF)网络功能130，用于分组路由和转发以及用户面数据的服务质量(quality of service，QoS)处理等。
数据网络(data network，DN)网络功能140，用于提供传输数据的网络。
接入管理功能(access and mobility management function，AMF)网络功能150，主要用于移动性管理和接入管理等，可以用于实现移动性管理实体(mobility management entity，MME)功能中除会话管理之外的其它功能，例如，合法监听以及接入授权/鉴权等功能。可理解，以下简称AMF网络功能为AMF。本申请实施例中，AMF网络功能包括为远端AMF和中继AMF，该远端AMF为：用于为远端UE提供服务的AMF；该中继AMF为：用于为中继UE提供服务的AMF。
会话管理功能网元(session management function，SMF)160，主要用于会话管理、终端设备的网络互连协议(internet protocol，IP)地址分配和管理、选择可管理用户平面功能、策略控制和收费功能接口的终结点以及下行数据通知等。本申请中，会话管理功能网元又可称为会话管理网元。
策略控制网络功能170，如策略控制功能网元(policy control function，PCF)，用于指导网络行为的统一策略框架，为控制面功能(例如AMF，SMF网络功能等)提供策略规则信息等。本申请中，策略控制功能网元又可称为策略控制网元。
认证服务器功能(authentication server function，AUSF)180，用于鉴权服务、产生密钥实现对终端设备的双向鉴权，支持统一的鉴权框架。
统一数据管理(unified data management，UDM)网络功能190，可用于处理终端设备标识，接入鉴权，注册以及移动性管理等。可理解，以下简称UDM网络功能为UDM。
应用功能(application function，AF)1100，用于进行应用影响的数据路由，接入网络开放功能，与策略框架交互进行策略控制等。
网络切片选择功能(network slice selection function，NSSF)，可用于确定网络切片实例，选择AMF网络功能等等。
网络存储网络功能，如包括网络注册功能(network repository function，NRF)，可用于维护网络中所有网络功能服务的实时信息。
可理解，图1所示的网络架构还可以包括近距离服务功能(ProSe function)，该近距离服务功能可以用于执行ProSe业务的管理和控制等等。
本申请实施例中的移动性管理网络功能可以是图1所示的AMF网络功能150，也可以是未来通信系统中的具有上述AMF网络功能150的其他网络功能。或者，本申请中的移动 性管理网络功能还可以是长期演进(long term evolution，LTE)中的移动性管理实体(mobility management entity，MME)等。
为方便说明，将AMF网络功能150简称为AMF，将终端设备110称为UE，即本申请实施例中后文所描述的AMF均可替换为移动性管理网络功能或核心网设备，UE均可替换为终端设备。
图1中示出的网络架构(例如5G网络架构)采用基于服务的架构，传统网元功能(或网络功能)基于网络功能虚拟化(network function virtualization，NFV)技术拆分成若干个自包含、自管理、可重用的网络功能服务模块，通过灵活定义服务模块集合，可以实现定制化的网络功能重构，对外通过统一的服务调用接口组成业务流程。图1中示出的网络架构示意图可以理解为一种非漫游场景下基于服务的5G网络架构示意图。对于漫游场景，本申请实施例同样适用。
可理解，以上说介绍的术语在不同的领域或不同的标准中，可能有不同的名称，因此不应将以上所示的名称理解为对本申请实施例的限定。上述网络功能或者功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。
以下将详细介绍本申请实施例提供的应用服务器的发现方法。
参见图2，图2是本申请实施例提供的一种应用服务器的发现方法的流程示意图。该方法可以应用于图1所示的网络架构。如图3所示，该方法包括：
S201：第一网络设备接收第二网络设备发送的第一信息。
具体地，第二网络设备为DNS AF。第一网络设备为SMF或PCF。
具体地，在S201之前，UE可以向DNS AF发送DNS请求信息(DNS Request)。该请求信息可以携带该应用的全限定域名(fully qualified domain name，FQDN)。DNS AF可以基于FQDN检查该应用是否存在业务层协议(service layer agreement，SLA)，即存在应用和运营商之间的商业协议。若存在，则DNS AF向SMF发送应用的优选接入位置信息请求。本申请实施例中，可以将该请求称为第一信息。第一信息可以包括应用标识(application identity，APP ID)。第一信息还可以包括UE的IP地址，该地址可以是IPv4地址，也可以是IPv6地址。
S202：第一网络设备至少根据第一信息确定至少一个第一接入位置。
具体地，第一接入位置为UE访问该应用的候选接入位置，即UE可以通过接入位置对应的UPF接入DN，而该应用对应的应用服务器则部署在DN中。当第一接入位置的数量为多个时，UE访问该应用的接入位置为上述多个第一接入位置中的一个。在具体实现时，SMF会为UE建立的PDU会话选择上述UPF作为PDU会话锚点(PDU session anchor,PSA)。总之，接入位置可以用于确定用于UE访问应用的UPF。可知，第一接入位置为UE访问应用所通过的用户面的位置，而非UE本身的位置。其中，用户面的位置可以通过子网信息和/或数据网络接入标识(data network access identifier，DNAI)来表示。
可选地，第一网络设备为SMF。SMF可以根据以下至少一种确定至少一个第一接入位置：应用对应的数据导向控制信息、UE当前的位置信息、运营商策略以及当前网络的负荷 状况等。
应用对应的数据导向控制信息中定义了部署应用服务器的DN对应的位置信息(数据网络接入标识(data network access identifier，DNAI))以及对应的接入该应用服务器的时间(时间有效性条件)、UE的位置信息(时间有效性条件)等。因此，如果存在应用对应的数据导向控制信息，则SMF可以根据当前的时间和UE当前的位置等信息来确定适用的DNAI。此外，SMF还可以根据运营商的策略(譬如运营商自身配置了针对这个应用的数据导向应用)和当前的网络负荷情况确定适用的DNAI。
其中，应用对应的数据导向控制信息可以由UDR提供。具体可以直接与UDR交互，获取UDR中保存的应用对应的数据导向控制信息。或者SMF与PCF交互，获取PCF从UDR处获取的应用对应的数据导向控制信息。
可选地，第一网络设备为PCF。PCF可以向SMF发送用于请UE访问应用的接入位置的消息，SMF可以根据以下至少一种确定至少一个第一接入位置：应用对应的数据导向控制信息、UE当前的位置信息、运营商策略以及当前网络的负荷状况等。SMF将上述至少一个第一接入位置的标识信息发送给PCF。其中，应用对应的数据导向控制信息可以由PCF提供。具体地，SMF与PCF交互，获取PCF从UDR处获取的应用对应的数据导向控制信息。
S203：第一网络设备将至少一个第一接入位置的标识信息发送给第二网络设备。
具体地，第一接入位置的标识信息可以是子网信息和/或数据网络接入标识(data network access identifier，DNAI)。对于IPv4的网络，子网信息为候选的UPF对应的NAT后公网IP地址范围。对于IPv6网络，子网信息为候选的UPF对应的IPv6地址或前缀的范围。
进一步地，第一网络设备还可以确定上述至少一个第一接入位置各自对应的优先级信息，并将优先级信息发送给DNS AF。其中，各个第一接入位置的优先级信息可以根据路由路径优化程度、运营商策略、网络负荷等多种因素来决定。例如，路由路径越短的第一接入位置对应的优先级越高。
S204：第二网络设备根据至少一个第一接入位置的标识信息确定应用的服务器的地址。
具体地，DNS AF确定应用的服务器的地址可分为两种场景，不同场景下确定的方式不同。具体可见以下描述：
场景一：网络使用本地DNS服务器
在这种场景下，DNS AF可以根据本地配置，以及每个第一接入位置的标识信息所对应的第一接入位置，从上述至少一个第一接入位置中选择一个接入位置，进而选择该接入位置对应的本地DNS服务器。DNS AF可以向该本地DNS服务器发送DNS请求(request)消息，该消息中可以携带APP FQDN。本地DNS服务器可以确定第一应用服务器的地址，并将第一应用服务器的地址返回给第二网络设备DNS AF。其中，第一应用服务器的地址即为UE最终接入的应用服务器的地址。
具体地，DNS AF根据本地配置选择一个第一接入位置，并确定对应的本地DNS服务器。DNS AF向本地DNS服务器发送DNS请求信息，若本地DNS服务器返回成功应答，DNS AF确定应答消息中携带的服务器地址为第一应用服务器地址，而这个第一接入位置 为第二接入位置。
本地DNS服务器返回失败应答，则DNS AF再选择一个第一接入位置进行查询。本申请实施例中，可以将上述DNS请求信息称为第四信息。本申请实施例中，可以将DNS AF最终选择的接入位置称为第二接入位置。将本地DNS服务器称为第二DNS服务器。
可知，若第一网络设确定的第一接入位置的标识信息为DNAI，则DNS AF还需根据DNAI来确定子网信息。
进一步地，DNS AF可以根据本地配置以及至少一个第一接入位置的优先级信息从上述至少一个第一接入位置中选择一个接入位置，进而选择该接入位置对应的本地DNS服务器。
具体地，DNS AF根据最高优先级的第一接入位置确定对应的本地DNS服务器，并向本地DNS服务器发送DNS请求信息，若本地DNS服务器返回成功应答，DNS AF确定应答消息中携带的服务器地址为第一应用服务器地址，而这个第一接入位置即为第二接入位置。若本地DNS服务器返回失败应答，则DNS AF则根据优先级信息选择第二高优先级的第一接入位置进行查询。
场景二：网络使用集中式DNS服务器
在这种场景下，DNS AF可以向集中式DNS服务器发送DNS请求(request)消息，该消息中可以携带上述至少一个第一接入位置的标识信息。具体可以通过增强DNS客户端子网(EDNS client subnet，ECS)选项来携带，若上述接入位置的标识信息为子网信息，则每个ECS选项中可以包括S203中返回的子网信息。若上述接入位置的标识信息为DNAI，则DNS AF需要先根据DNAI确定子网信息。本申请实施例中，可以将上述DNS请求信息称为第三信息。本申请实施例中，可以将集中式DNS服务器称为第一DNS服务器。
可选地，若第一网络设备还可以确定上述至少一个第一接入位置各自对应的优先级信息，并将优先级信息发送给DNS AF，则DNS AF向集中式DNS服务器发送的第二信息中也可以携带上述至少一个第一接入位置各自对应的优先级信息。本申请实施例中可以将第一网络设发送给DNS AF的优先级信息称为第一优先级信息，将DNS AF向集中式DNS服务器发送的优先级信息称为第二优先级信息。
集中式DNS服务器接收到DNS请求信息后，可以根据配置及上述第二优先级信息选择部分候选的应用服务器，将这部分候选的应用服务器的地址返回给DNS AF，并由DNS AF根据上述第一优先级信息确定第一应用服务器的地址。DNS AF从返回的候选应用服务器的地址中选择具有最高优先级的应用服务器地址为第一应用服务器地址，从而该服务器地址对应的第一接入位置为第二接入位置。
可选地，集中式DNS服务器也可以不做初步选择，而是直接确定上述至少一个第一接入位置对应的应用服务器的地址。
在DNS AF确定第一应用服务器的地址之后，DNS AF可以向第一网络设备发送数据导向控制执行(traffic steering control performing)请求信息。当第一网络设备为PCF时，PCF可以进一步将该请求信息发送给SMF。该请求信息可以用于为UE选择访问应用的用户面网元。
可选地，当候选的第一接入位置唯一时，SMF可以直接根据其确定的候选位置的标识 信息为UE选择访问应用的用户面网元。
可选地，当候选的第一接入位置不唯一时，上述请求信息还可以携带第二接入位置的标识信息，SMF根据该第二接入位置的标识信息为UE选择访问应用的用户面网元。其中，该第二接入位置为最终从多个候选的第一接入位置中选择的接入位置。SMF根据上述请求信息，为UE建立的PDU会话选择最终选择的第二接入位置的标识信息(DNAI或子网信息)对应UPF作为PSA。若子网信息为IPv6子网信息，则SMF为UE分配对应的IPv6地址前缀。
此外，DNS AF还可以向UE发送DNS响应(response)消息，该响应消息中携带第一应用服务器的地址。UE可以通过选择的PSA，与第一应用服务器建立连接，从而与第一应用服务器进行通信。
实施本申请实施例，由于SMF已配置整个网络的拓扑结构，由SMF来确定候选的接入位置，可以更好的考虑网络的当前状况，简化DNS AF的配置，还可以避免DNS选择的服务器不可用的情况发生，提高UE接入应用服务器的成功率，降低网络延时。
不限于UE向DNS AF发送DNS request，在具体实现中，本申请实施例同样支持DNS over HTTPS，UE向DNS AF发送DNS over HTTS的请求信息。本申请实施例对此不做限定。
本申请实施例中涉及的第一网络设备可以是SMF，也可以是PCF。为更详细的理解本申请实施例所提供的应用服务器的发现方法，以下分别介绍第一网络设备为SMF或PCF时详细的应用服务器的发现方法。
参见图3，图3是第一网络设备为SMF时，本申请实施例提供的一种应用服务器的发现方法的流程示意图。如图3所示，该方法包括：
S301：UE建立PDU会话。
具体地，UE建立PDU会话，网络选择PSA，并为UE分配IP地址。
可选地，SMF可以获取应用对应的数据导向控制信息(traffic steering control data)。数据导向控制信息具体可以包括用于识别数据的信息、表示接入DN的用户面接入标识，以及对应于UPF上配置的DN的数据导向策略。其中，用于识别数据的信息譬如可以是应用数据的三元组，APP ID等。表示接入DN的用户面接入标识可以是DNAI。对应于UPF上配置的数据导向策略可以是数据路由文档标识(traffic steering profile ID)。
可选地，数据导向控制信息还可以包括空间有效性条件及时间有效性条件。其中，空间有效性条件可以用于表示应用数据导向信息(traffic steering information)的UE位置。时间有效性条件可以用于表示应用traffic steering information的时间，该时间有效性条件通常为一个时间区间。
S302：UE向DNS AF发送DNS请求信息。
具体地，UE建立PDU会话后，一个应用想要与一个边界应用服务器建立连接，UE可以向DNS AF发送请求信息(DNS Request)，该请求信息可以携带应用的FQDN，用于请求该应用的服务器的地址。本申请实施例中，可以将该请求信息称为第五信息。
S303：DNS AF向SMF发送第一信息。
具体地，DNS AF可以基于FQDN检查该应用是否存在SLA。若存在，则DNS AF向SMF发送应用的优选接入位置信息请求。本申请实施例中，可以将该请求称为第一信息。第一信息可以包括APP ID。第一信息还可以包括UE的IP地址，该地址可以是IPv4地址，也可以是IPv6地址。
S304：SMF从UDR获取应用对应的数据导向控制信息。
具体地，SMF可以根据UE的IP地址确定UE。若SMF在S301中未获取应用对应的数据导向控制信息，则SMF可以与UDR交互，获取UDR中保存的应用对应的数据导向控制信息。或者SMF可以与PCF交互，获取PCF从UDR处获取的应用对应的数据导向控制信息。
S305：SMF至少根据第一信息确定至少一个第一接入位置。
具体地，SMF可以根据以下至少一种确定至少一个第一接入位置：应用对应的数据导向控制信息、UE当前的位置信息、运营商策略以及当前网络的负荷状况等。
如果存在应用对应的数据导向控制信息，则SMF可以根据当前的时间和UE当前的位置等信息来确定适用的DNAI。此外，SMF还可以根据运营商的策略(譬如运营商自身配置了针对这个应用的数据导向应用)和当前的网络负荷情况确定适用的DNAI。
其中，第一接入位置为UE访问该应用的候选接入位置，即UE可以通过接入位置对应的UPF接入DN，而该应用对应的应用服务器则部署在DN中。当第一接入位置的数量为多个时，UE访问应用的接入位置为上述多个第一接入位置中的一个。在具体实现时，SMF会为UE建立的PDU会话选择上述UPF作为PDU会话锚点(PDU Session Anchor,PSA)。总之，接入位置可以用于确定用于UE访问应用的UPF。
具体地，第一接入位置的标识信息可以是子网地址和/或DNAI。对于IPv4的网络，子网信息为候选的UPF对应的NAT后公网IP地址范围。对于IPv6网络，子网信息为候选的UPF对应的IPv6地址或前缀的范围。
S306：SMF将至少一个第一接入位置的标识信息发送给DNS AF。
具体地，SMF将至少一个第一接入位置的标识信息发送给DNS AF后，可使DNS AF根据上述至少一个第一接入位置的标识信息确定应用的服务器的地址。其中，第一接入位置的标识信息可以是子网信息和/或DNAI。
进一步地，SMF还可以确定上述至少一个第一接入位置各自对应的优先级信息，并将优先级信息发送给DNS AF。其中，各个第一接入位置的优先级信息可以根据路由路径优化程度、运营商策略、网络负荷等多种因素来决定。例如，路由路径越短的第一接入位置对应的优先级越高。
DNS AF确定应用的服务器的地址可分为两种场景，不同场景下确定的方式不同。具体可见以下描述：
场景一：网络使用本地DNS服务器(S307-S309)
S307：DNS AF向本地DNS服务器发送第四信息。
具体地，DNS AF可以根据本地配置从上述至少一个第一接入位置中选择一个接入位置，进而选择该接入位置对应的本地DNS服务器。DNS AF可以向该本地DNS服务器发送DNS请求(request)消息，该消息中可以携带APP FQDN。本申请实施例中，可以将上 述DNS请求信息称为第四信息。本申请实施例中，可以将DNS AF最终选择的接入位置称为第二接入位置。将本地DNS服务器称为第二DNS服务器。
可知，若S306中SMF发送的接入位置的标识信息为DNAI，则DNS AF还需根据DNAI来确定子网信息。
具体地，DNS AF根据本地配置选择一个第一接入位置，并确定对应的本地DNS服务器。DNS AF向本地DNS服务器发送DNS请求信息，若本地DNS服务器返回成功应答，DNS AF确定应答消息中携带的服务器地址为第一应用服务器地址，而这个第一接入位置为第二接入位置。本地DNS服务器返回失败应答，则DNS AF再选择一个第一接入位置进行查询。
进一步地，DNS AF可以根据本地配置以及至少一个第一接入位置的优先级信息从上述至少一个第一接入位置中选择一个接入位置，进而选择该接入位置对应的本地DNS服务器。
具体地，DNS AF根据最高优先级的第一接入位置确定对应的本地DNS服务器，并向本地DNS服务器发送DNS请求信息，若本地DNS服务器返回成功应答，DNS AF确定应答消息中携带的服务器地址为第一应用服务器地址，而这个第一接入位置即为第二接入位置。若本地DNS服务器返回失败应答，则DNS AF则根据优先级信息选择第二高优先级的第一接入位置进行查询。
S308：本地DNS服务器确定第一应用服务器的地址。
具体地，本地DNS服务器确定第一应用服务器的地址，第一应用服务器的地址即为UE最终接入的应用服务器的地址。
S309：本地DNS服务器将第一应用服务器的地址发送给DNS AF。
具体地，本地DNS服务器可以向DNS AF返回应答消息，该应答消息中可以携带上述第一应用服务器的地址。
场景二：网络使用集中式DNS服务器(S310-S313)
S310：DNS AF向集中式DNS服务器发送第三信息。
具体地，DNS AF可以向集中式DNS服务器发送DNS请求(request)消息，该消息中可以携带上述至少一个第一接入位置的标识信息。具体可以通过ECS选项来携带，若上述接入位置的标识信息为子网信息，则每个ECS选项中可以包括S306中返回的子网信息。若上述接入位置的标识信息为DNAI，则DNS AF需要先根据DNAI确定子网信息。本申请实施例中，可以将上述DNS请求信息称为第三信息。本申请实施例中，可以将集中式DNS服务器称为第一DNS服务器。
可选地，若SMF还可以确定上述至少一个第一接入位置各自对应的优先级信息，并将优先级信息发送给DNS AF，则DNS AF向集中式DNS服务器发送的第三信息中也可以携带上述至少一个第一接入位置各自对应的优先级信息。本申请实施例中可以将SMF发送给DNS AF的优先级信息称为第一优先级信息，将DNS AF向集中式DNS服务器发送的优先级信息称为第二优先级信息。
S311：集中式DNS服务器初步选择至少一个应用服务器。
可选地，集中式DNS服务器可以根据配置及上述第二优先级信息选择部分候选的应用 服务器。
DNS AF从返回的候选应用服务器的地址中选择具有最高优先级的应用服务器地址为第一应用服务器地址，从而该服务器地址对应的第一接入位置为第二接入位置。
可选地，集中式DNS服务器也可以不做初步选择，而是直接确定上述至少一个第一接入位置对应的应用服务器的地址。
S312：集中式DNS服务器将至少一个应用服务器的地址发送给DNS AF。
具体地，集中式DNS服务器可以将确定的至少一个候选的应用服务器的地址发送给DNS AF，以供DNS AF进一步从候选的应用服务器中选择UE最终接入的应用服务器。
可选地，SMF发送给DNS AF的接入位置的标识信息可以与DNS AF发送给集中式DNS服务器或本地DNS服务器的接入位置的标识信息不同。在本申请实施例中，可以将SMF发送给DNS AF的接入位置的标识信息称为第一标识信息，将DNS AF发送给集中式DNS服务器或本地DNS服务器的接入位置的标识信息称为第二标识信息。DNS AF可以将第一标识信息映射为第二标识信息。
具体地，第一标识信息可以是第一DNAI和/或第一子网信息。第二标识信息可以是第二DNAI和/或第二子网信息。第二DNAI可以根据第一DNAI确定，第二子网信息可以根据第一DNAI或第一子网信息确定。也即是说，当第一标识信息为DNAI，DNS AF可以将DNAI映射为子网信息。
S313：DNS AF从至少一个应用服务器的地址中确定第一服务器的地址。
具体地，DNS AF可以根据上述候选的应用服务器的地址对应的第一接入位置的优先级信息来确定。
S314：DNS AF向SMF发送请求信息。
具体地，DNS AF向SMF发送数据导向控制执行(traffic steering control performing)请求信息，该请求信息可以用于为UE选择访问应用的用户面网元。
可选地，当候选的第一接入位置唯一时，SMF可以直接根据其确定的候选位置的标识信息为UE选择访问应用的用户面网元。
可选地，当候选的第一接入位置不唯一时，上述请求信息还可以携带第二接入位置的标识信息，SMF根据该第二接入位置的标识信息为UE选择访问应用的用户面网元。其中，该第二接入位置为最终从多个候选的第一接入位置中选择的接入位置。
S315：SMF插入PSA。
具体地，SMF根据上述请求信息，为UE建立的PDU会话选择最终选择的第二接入位置的标识信息(DNAI或子网信息)对应的UPF作为PSA。若子网信息为IPv6子网信息，则SMF为UE分配对应的IPv6地址前缀。
S316：DNS AF将第一应用服务器的地址发送给UE。
具体地，DNS AF可以向UE发送DNS响应(response)消息，该响应消息中携带第一应用服务器的地址。UE可以通过选择的PSA，与第一应用服务器建立连接，从而与第一应用服务器进行通信。
实施本申请实施例，由于SMF已配置整个网络的拓扑结构，由SMF来确定候选的接入位置，可以更好的考虑网络的当前状况，简化DNS AF的配置，还可以避免DNS选择的 服务器不可用的情况发生，提高UE接入应用服务器的成功率，降低网络延时。
参见图4，图4是第一网络设备为PCF时，本申请实施例提供的一种应用服务器的发现方法的流程示意图。如图4所示，该方法包括：
S401：UE建立PDU会话。
具体地，UE建立PDU会话，网络选择PSA，并为UE分配IP地址。
可选地，PCF可以获取应用对应的数据导向控制信息(traffic steering control data)。数据导向控制信息具体可以包括用于识别数据的信息、表示接入DN的用户面接入标识，以及对应于UPF上配置的DN的数据导向策略。其中，用于识别数据的信息譬如可以是应用数据的三元组，APP ID等。表示接入DN的用户面接入标识可以是DNAI。对应于UPF上配置的数据导向策略可以是数据路由文档标识(traffic steering profile ID)。
可选地，数据导向控制信息还可以包括空间有效性条件及时间有效性条件。其中，空间有效性条件可以用于表示应用数据导向信息(traffic steering information)的UE位置。时间有效性条件可以用于表示应用LAN traffic steering information的时间，该时间有效性条件通常为一个时间区间。
S402：UE向DNS AF发送DNS请求信息。
具体地，S402与S302一致，此处不赘述。
S403：DNS AF向PCF发送第一信息。
具体地，DNS AF可以基于FQDN检查该应用是否存在业务层协议(service layer agreement，SLA)。若存在，则DNS AF向PCF发送应用的优选接入位置信息请求。本申请实施例中，可以将该请求称为第一信息。第一信息可以包括APP ID。第一信息还可以包括UE的IP地址，该地址可以是IPv4地址，也可以是IPv6地址。
S404：PCF向SMF发送第二信息。
具体地，若PCF自身无法确定候选的接入位置信息，则PCF可以向SMF发送第二信息。该第二信息可以用于请求UE访问应用的接入位置，第二信息中可以携带数据导向控制策略(traffic steering control policy)，该策略中可以包括APP ID、DNAI列表等信息。
在一种可能的实施例中，PCF自身可以确定候选的接入位置信息。若PCF在S401中未能获取应用对应的数据导向控制信息，则PCF可以与UDR交互，获取UDR中保存的应用对应的数据导向控制信息。PCF可以根据导向控制信息指定数据导向控制策略，该策略中可以包括APP ID、DNAI列表等信息。
本申请实施例中，以PCF自身无法确定候选的接入位置信息为例进行说明。
S405：SMF从PCF获取应用对应的数据导向控制信息。
具体地，若SMF无法获取应用对应的数据导向控制信息，SMF可以与PCF交互，获取应用对应的数据导向控制信息。进一步地，PCF可以与UDR交互，获取UDR中保存的应用对应的数据导向控制信息。
S406：SMF至少根据第一信息确定至少一个第一接入位置。
具体地，S406与S305一致，此处不赘述。
S407：SMF将至少一个第一接入位置的标识信息发送给PCF。
具体地，SMF可以向PCF发送应答消息，该应答消息中可以携带上述至少一个第一接入位置的标识信息。标识信息可以是子网信息和/或DNAI。子网信息可以是IPv4子网信息或IPv6子网信息。
S408：PCF将至少一个第一接入位置的标识信息发送给DNS AF。
具体地，PCF可以向DNS AF发送应答消息，该应答消息中可以携带上述至少一个第一接入位置的标识信息。
与上一实施例类似，本申请实施例中，DNS AF确定应用的服务器的地址也可分为两种场景，不同场景下确定的方式不同。具体可见以下描述：
场景一：网络使用本地DNS服务器(S409-S411)
S409：DNS AF向本地DNS服务器发送第四信息。
具体地，S409与S307一致，此处不赘述。
S410：本地DNS服务器确定第一应用服务器的地址。
具体地，S4010与S308一致，此处不赘述。
S411：本地DNS服务器将第一应用服务器的地址发送给DNS AF。
具体地，S411与S309一致，此处不赘述。
场景二：网络使用集中式DNS服务器(S412-S415)
S412：DNS AF向集中式DNS服务器发送第三信息。
具体地，S412与S310一致，此处不赘述。
S413：集中式DNS服务器初步选择至少一个应用服务器。
具体地，S413与S311一致，此处不赘述。
S414：集中式DNS服务器将至少一个应用服务器的地址发送给DNS AF。
具体地，S414与S312一致，此处不赘述。
S415：DNS AF从至少一个应用服务器的地址中确定第一服务器的地址。
具体地，S415与S313一致，此处不赘述。
S416：DNS AF向PCF发送请求信息。
具体地，DNS AF向PCF发送数据导向控制执行(traffic steering control performing)请求信息，该请求信息可以用于为UE选择访问应用的用户面网元，该请求信息可以携带APP ID。当候选的第一接入位置不唯一时，该请求信息还可以携带第二接入位置的标识信息，如DNAI和/或子网信息。
S417：PCF向SMF发送请求信息。
具体地，PCF向SMF发送数据导向控制执行(traffic steering control performing)请求信息，该请求信息可以用于为UE选择访问应用的用户面网元，该请求信息可以携带APP ID。
可选地，当候选的第一接入位置唯一时，SMF可以直接根据其确定的候选位置的标识信息为UE选择访问应用的用户面网元。
可选地，当候选的第一接入位置不唯一时，上述请求信息还可以携带第二接入位置的标识信息，PCF根据该第二接入位置的标识信息为UE选择访问应用的用户面网元。其中，该第二接入位置为最终从多个候选的第一接入位置中选择的接入位置。
S418：SMF插入PSA。
具体地，S418与S315一致，此处不赘述。
S419：DNS AF将第一应用服务器的地址发送给UE。
具体地，S419与S316一致，此处不赘述。
实施本申请实施例，由于SMF已配置整个网络的拓扑结构，由SMF来确定候选的接入位置，可以更好的考虑网络的当前状况，简化DNS AF的配置，还可以避免DNS选择的服务器不可用的情况发生，提高UE接入应用服务器的成功率，降低网络延时。
以上详细介绍了本申请实施例提供的方法，以下将详细介绍本申请实施例提供的网络设备。
参见图5，图5是本申请实施例提供的一种网络设备的结构示意图。该网络设备可用于执行本申请所提供的应用服务器的发现方法中第一网络设备执行的步骤。如图5所示，网络设备50至少可以包括：接收单元510、确定单元520及发送单元530。其中：
接收单元510，用于接收第二网络设备发送的第一信息，上述第一信息包括应用的标识。
确定单元520，用于至少根据上述第一信息确定至少一个第一接入位置，上述第一接入位置为用户设备访问上述应用的候选接入位置。
发送单元530，用于将上述至少一个第一接入位置的标识信息发送给上述第二网络设备，上述至少一个第一接入位置的标识信息用于上述应用的服务器的地址的确定。
在一种可能的实现方式中，网络设备50为会话管理网元。
接收单元510还用于：接收上述第二网络设备发送的请求信息，上述请求信息用于请求网络设备50为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，确定单元520具体用于：根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定上述至少一个第一接入位置。
在一种可能的实现方式中，上述应用对应的数据导向控制信息由网络设备50从统一数据存储库或策略控制网元获取。
在一种可能的实现方式中，网络设备50为策略控制网元。
确定单元520具体用于：向会话管理网元发送第二信息，上述第二信息用于请求上述用户设备访问上述应用的接入位置；接收上述会话管理网元发送的上述至少一个接入位置的标识信息。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息由上述会话管理网元根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
在一种可能的实现方式中，网络设备50向上述会话管理网元提供上述应用对应的数据导向控制信息。
在一种可能的实现方式中，接收单元510还用于：接收上述第二网络设备的请求信息，上述请求信息用于请求上述会话管理网元为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息为至少一个数据网络接入标识DNAI和/或子网信息。
在一种可能的实现方式中，上述至少一个DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述至少一个子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述应用的服务器的地址为域名系统DNS服务器向上述第二网络设备发送的地址。
可理解，对于图5所示的网络设备的具体实现方式可参考图2、图3和图4所示的第一网络设备所执行的步骤，这里不作详述。
本申请实施例提供了另外一种网络设备。参见图6，图6是本申请实施例提供的一种网络设备的结构示意图。该网络设备可用于执行本申请所提供的应用服务器的发现方法中第二网络设备执行的步骤。如图6所示，网络设备60至少可以包括：发送单元610、接收单元620及确定单元630。其中：
发送单元610，用于向第一网络设备发送第一信息，上述第一信息包括应用的标识。
接收单元620，用于接收上述第一网络设备发送的至少一个第一接入位置的第一标识信息；上述第一接入位置为用户设备访问应用的候选接入位置。
确定单元630，用于根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址。
在一种可能的实现方式中，确定单元630具体用于：向第一域名系统DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器的地址；从上述至少一个服务器的地址中确定第一服务器的地址。
在一种可能的实现方式中，接收单元620还用于：接收上述的一网络设备发送的上述至少一个第一接入位置的第一标识信息的第一优先级信息。
确定单元630具体用于：向第一DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址；根据上述第一优先级信息和上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服 务器地址确定上述第一服务器的地址。
在一种可能的实现方式中，上述第三信息还包括上述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中上述第二优先级信息根据上述第一优先级信息确定；上述第一DNS服务器发送的上述至少一个第一服务器的地址由上述第一DNS服务器根据上述第二优先级信息确定。
在一种可能的实现方式中，确定单元630具体用于：根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息；上述第四信息用于获取上述第一服务器的地址；上述至少一个第一接入位置的第一标识信息包括上述第二接入位置的第一标识信息；上述第二网络设备接收上述第二DNS服务器发送的上述第一服务器的地址。
在一种可能的实现方式中，接收单元620具体用于：接收上述第一网络设备发送的上述至少一个第一接入位置的第一标识信息对应的优先级信息。
确定单元630具体用于：根据上述至少一个第一接入位置的第一标识信息对应的优先级信息确定上述第二接入位置对应的上述第二DNS服务器，并向上述第二DNS服务器发送上述第四信息。
在一种可能的实现方式中，接收单元620还用于：接收上述用户设备发送的第五信息，上述第五信息用于请求上述应用的服务器的地址。
在一种可能的实现方式中，发送单元610还用于：向上述第一网络设备发送请求信息，上述请求信息用于请求上述第一网络设备为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的第一标识信息，上述至少一个第一接入位置包括上述第二接入位置，上述第二接入位置对应上述第一服务器的地址。
在一种可能的实现方式中，发送单元610还用于：向上述用户设备发送上述第一服务器的地址。
在一种可能的实现方式中，上述至少一个第一接入位置的第一标识信息为至少一个第一数据网络接入标识DNAI和/或第一子网信息。
在一种可能的实现方式中，上述至少一个第一DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述一个或多个第一子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述一个或多个第一子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中上述至少一个第二DNAI根据上述至少一个第一DNAI确定，上述至少一个第二子网信息根据上述至少一个第一DNAI或第一子网信息。
可理解，对于图6所示的网络设备的具体实现方式可参考图2、图3和图4所示的第二网络设备所执行的步骤，这里不作详述。
参见图7，图7是本申请实施例提供的一种通信系统的结构示意图。该通信系统可用于执行图2、图3和图4所示的方法。如图7所示，该通信系统包括：
第一网络设备710，用于接收第二网络设备720的第一信息，上述第一信息包括应用的标识。
第一网络设备710，还用于至少根据上述第一信息确定至少一个第一接入位置，上述第一接入位置为用户设备访问上述应用的候选接入位置。
第一网络设备710，还用于将上述至少一个第一接入位置的第一标识信息发送给第二网络设备720。
第二网络设备720，用于根据上述至少一个第一接入位置的第一标识信息确定上述应用的第一服务器的地址。
在一种可能的实现方式中，第一网络设备710为会话管理网元。
第一网络设备710，还用于接收第二网络设备720发送的请求信息，上述请求信息用于请求第一网络设备710为上述用户设备选择访问上述应用的用户面网元。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个接入位置包括上述第二接入位置。
在一种可能的实现方式中，第一网络设备710，具体用于：根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定上述至少一个第一接入位置。
在一种可能的实现方式中，上述应用对应的数据导向控制信息由第一网络设备710从统一数据存储库或策略控制网元获取。
在一种可能的实现方式中，第一网络设备710为策略控制网元。
第一网络设备710，具体用于：向会话管理网元发送第二信息，上述第二请求用于请求上述用户设备访问上述应用的接入位置；接收上述会话管理网元发送的上述至少一个接入位置的标识信息。
在一种可能的实现方式中，上述至少一个第一接入位置的标识信息由上述会话管理网元根据上述应用对应的数据导向控制信息、上述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
在一种可能的实现方式中，第一网络设备710向上述会话管理网元提供上述应用对应的数据导向控制信息。
在一种可能的实现方式中，上述请求信息还包括第二接入位置的标识信息，上述至少一个第一接入位置包括上述第二接入位置。
在一种可能的实现方式中，第二网络设备720，具体用于：向第一域名系统DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器的地址；从上述至少一个服务器的地址中确定第一服务器的地址。
在一种可能的实现方式中，第一网络设备710，还用于将上述至少一个第一接入位置 的第一标识信息的第一优先级信息发送给第二网络设备720。
第二网络设备720，具体用于：向第一DNS服务器发送第三信息，上述第三信息中包括至少一个第一接入位置的第二标识信息，其中上述至少一个第一接入位置的第二标识信息根据上述至少一个第一接入位置的第一标识信息确定；接收上述第一DNS服务器发送的上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址；根据上述第一优先级信息和上述至少一个第一接入位置的第二标识信息对应的上述应用的至少一个服务器地址确定上述第一服务器的地址。
在一种可能的实现方式中，上述第三信息还包括上述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中上述第二优先级信息根据上述第一优先级信息确定；上述第一DNS服务器发送的上述至少一个第一服务器的地址由上述第一DNS服务器根据上述第二优先级信息确定。
在一种可能的实现方式中，第二网络设备720，具体用于：根据上述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向上述第二DNS服务器发送第四信息；上述第四信息用于获取上述第一服务器的地址；上述至少一个第一接入位置的第一标识信息包括上述第二接入位置的第一标识信息；上述第二网络设备接收上述第二DNS服务器发送的上述第一服务器的地址。
在一种可能的实现方式中，第一网络设备710，还用于将上述至少一个第一接入位置的第一标识信息对应的优先级信息发送给第二网络设备720。
第二网络设备720，具体用于：根据上述至少一个第一接入位置的第一标识信息对应的优先级信息确定上述第二接入位置对应的上述第二DNS服务器，并向上述第二DNS服务器发送上述第四信息。
在一种可能的实现方式中，第二网络设备720，还用于接收上述用户设备发送的第五信息，上述第五信息用于请求上述应用的服务器的地址。
在一种可能的实现方式中，第二网络设备720，还用于向上述用户设备发送上述第一服务器的地址。
在一种可能的实现方式中，上述一个或多个接入位置的第一标识信息为一个或多个第一数据网络接入标识DNAI和/或第一子网信息。
在一种可能的实现方式中，上述至少一个第一DNAI为上述用户设备访问上述应用可以采用的用户面网元对应的DNAI。
在一种可能的实现方式中，上述至少一个第一子网信息为上述用户设备访问上述应用可以采用的用户面网元对应的子网信息。
在一种可能的实现方式中，上述一个或多个第一子网信息包括IPv6子网信息或IPv4子网信息。
在一种可能的实现方式中，上述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中上述至少一个第二DNAI根据上述至少一个第一DNAI确定，上述至少一个第二子网信息根据上述至少一个第一DNAI或第一子网信息。
可理解，对于图7所示的通信系统中各个网络设备的具体实现方式可参考图2、图3和图4所示的方法，这里不作详述。
参见图8，图8是本申请实施例提供的一种网络设备的结构示意图。
在一个实施例中，该网络设备可以作为第一网络设备或第二网络设备使用。该网络设备的具体实现方式可参考图2、图3和图4所示的方法。
作为示例，当图5或图6所示网络设备中的确定单元(520或630)用处理器实现，发送单元(530或610)和接收单元(510或620)用收发器实现时，如图8所示，该网络设备80包括至少一个处理器820，用于实现本申请实施例提供的方法中第一网络设备或第二网络设备的功能，以及网络设备80还可以包括收发器810。收发器可用于通过传输介质和其它装置进行通信。处理器820利用收发器810收发数据(如收发消息等等)，并用于实现上述方法实施例所述的方法。
可选的，网络设备80还可以包括至少一个存储器830，用于存储程序指令和/或数据。存储器830和处理器820耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器820可能和存储器830协同操作。处理器820可能执行存储器830中存储的程序指令。
本申请实施例中不限定上述收发器810、处理器820以及存储器830之间的具体连接介质。本申请实施例在图8中以存储器830、处理器820以及收发器810之间通过总线840连接，总线在图8中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
根据本申请实施例提供的方法，本申请还提供一种计算机程序产品，该计算机程序产 品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图2和/或图3和/或图4所示实施例中的方法。
根据本申请实施例提供的方法，本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图2和/或图3和/或图4所示实施例中的方法。
依据本申请实施例提供的方法，本申请还提供一种计算机程序，该计算机程序可用于执行图2和/或图3和/或图4所示实施例中的方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disc，SSD))等。
在本说明书中使用的术语“部件”、“模块”、“系统”等用于表示计算机相关的实体、硬件、固件、硬件和软件的组合、软件、或执行中的软件。例如，部件可以是但不限于，在处理器上运行的进程、处理器、对象、可执行文件、执行线程、程序和/或计算机。通过图示，在计算设备上运行的应用和计算设备都可以是部件。一个或多个部件可驻留在进程和/或执行线程中，部件可位于一个计算机上和/或分布在两个或更多个计算机之间。此外，这些部件可从在上面存储有各种数据结构的各种计算机可读介质执行。部件可例如根据具有一个或多个数据分组(例如来自与本地系统、分布式系统和/或网络间的另一部件交互的二个部件的数据，例如通过信号与其它系统交互的互联网)的信号通过本地和/或远程进程来通信。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各种说明性逻辑块(illustrative logical block)和步骤(step)，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (51)

  1. 一种应用服务器的发现方法，其特征在于，包括：
    第一网络设备接收第二网络设备的第一信息，所述第一信息包括应用的标识；
    所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，所述第一接入位置为用户设备访问所述应用的候选接入位置；
    所述第一网络设备将所述至少一个第一接入位置的标识信息发送给所述第二网络设备，所述至少一个第一接入位置的标识信息用于所述应用的服务器的地址的确定。
  2. 如权利要求1所述的方法，其特征在于，所述第一网络设备为会话管理网元；
    所述方法还包括：所述第一网络接收所述第二网络设备发送的请求信息，所述请求信息用于请求所述第一网络设备为所述用户设备选择访问所述应用的用户面网元。
  3. 如权利要求2所述的方法，其特征在于，所述请求信息还包括第二接入位置的标识信息，所述至少一个第一接入位置包括所述第二接入位置。
  4. 如权利要求1-3任一项所述的方法，其特征在于，所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，包括：所述第一网络设备根据所述应用对应的数据导向控制信息、所述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定所述至少一个第一接入位置。
  5. 如权利要求4所述的方法，其特征在于，所述应用对应的数据导向控制信息由所述第一网络设备从统一数据存储库或策略控制网元获取。
  6. 如权利要求1所述的方法，其特征在于，所述第一网络设备为策略控制网元；所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，包括：
    所述第一网络设备向会话管理网元发送第二信息，所述第二信息用于请求所述用户设备访问所述应用的接入位置；
    所述第一网络设备接收所述会话管理网元发送的所述至少一个接入位置的标识信息。
  7. 如权利要求6所述的方法，其特征在于，所述至少一个第一接入位置的标识信息由所述会话管理网元根据所述应用对应的数据导向控制信息、所述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
  8. 如权利要求7所述的方法，其特征在于，所述第一网络设备向所述会话管理网元提供所述应用对应的数据导向控制信息。
  9. 如权利要求6-8任一项所述的方法，其特征在于，所述方法还包括：
    所述第一网络设备接收所述第二网络设备的请求信息，所述请求信息用于请求所述会话管理网元为所述用户设备选择访问所述应用的用户面网元。
  10. 如权利要求9所述的方法，其特征在于，所述请求信息还包括第二接入位置的标识信息，所述至少一个第一接入位置包括所述第二接入位置。
  11. 如权利要求1-10任一项所述的方法，其特征在于，所述至少一个第一接入位置的标识信息为至少一个数据网络接入标识DNAI和/或子网信息。
  12. 如权利要求11所述的方法，其特征在于，所述至少一个DNAI为所述用户设备访 问所述应用可以采用的用户面网元对应的DNAI。
  13. 如权利要求11或12所述的方法，其特征在于，所述至少一个子网信息为所述用户设备访问所述应用可以采用的用户面网元对应的子网信息。
  14. 一种应用服务器的发现方法，其特征在于，包括：
    第二网络设备向第一网络设备发送第一信息，所述第一信息包括应用的标识；
    所述第二网络设备接收所述第一网络设备发送的至少一个第一接入位置的第一标识信息；所述第一接入位置为用户设备访问所述应用的候选接入位置；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址。
  15. 如权利要求14所述的方法，其特征在于，所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备向第一域名系统DNS服务器发送第三信息，所述第三信息中包括至少一个第一接入位置的第二标识信息，其中所述至少一个第一接入位置的第二标识信息根据所述至少一个第一接入位置的第一标识信息确定；
    所述第二网络设备接收所述第一DNS服务器发送的所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器的地址；
    所述第二网络设备从所述至少一个服务器的地址中确定第一服务器的地址。
  16. 如权利要求14所述的方法，其特征在于，所述方法还包括：所述第二网络设备接收所述的一网络设备发送的所述至少一个第一接入位置的第一标识信息的第一优先级信息；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备向第一DNS服务器发送第三信息，所述第三信息中包括至少一个第一接入位置的第二标识信息，其中所述至少一个第一接入位置的第二标识信息根据所述至少一个第一接入位置的第一标识信息确定；
    所述第二网络设备接收所述第一DNS服务器发送的所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器地址；
    所述第二网络设备根据所述第一优先级信息和所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器地址确定所述第一服务器的地址。
  17. 如权利要求16所述的方法，其特征在于，所述第三信息还包括所述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中所述第二优先级信息根据所述第一优先级信息确定；所述第一DNS服务器发送的所述至少一个第一服务器的地址由所述第一DNS服务器根据所述第二优先级信息确定。
  18. 如权利要求14所述的方法，其特征在于，所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向所述第二DNS服务器发送第四信息；所述第四信息用于获取所述第一服务器的地址；所述至少一个第一接入位置的第一标识信息包括所述第二接入 位置的第一标识信息；所述第二网络设备接收所述第二DNS服务器发送的所述第一服务器的地址。
  19. 如权利要求18所述的方法，其特征在于，所述方法还包括：所述第二网络设备接收所述第一网络设备发送的所述至少一个第一接入位置的第一标识信息对应的优先级信息；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向所述第二DNS服务器发送第四信息，包括：
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息对应的优先级信息确定所述第二接入位置对应的所述第二DNS服务器，并向所述第二DNS服务器发送所述第四信息。
  20. 如权利要求14-19任一项所述的方法，其特征在于，所述方法还包括：所述第二网络设备向所述第一网络设备发送请求信息，所述请求信息用于请求所述第一网络设备为所述用户设备选择访问所述应用的用户面网元。
  21. 如权利要求20所述的方法，其特征在于，所述请求信息还包括第二接入位置的第一标识信息，所述至少一个第一接入位置包括所述第二接入位置，所述第二接入位置对应所述第一服务器的地址。
  22. 如权利要求14-21任一项所述的方法，所述方法还包括：所述第二网络设备向所述用户设备发送所述第一服务器的地址。
  23. 如权利要求14-22任一项所述的方法，其特征在于，所述至少一个第一接入位置的第一标识信息为至少一个第一数据网络接入标识DNAI和/或第一子网信息。
  24. 如权利要求23所述的方法，其特征在于，所述至少一个第一DNAI为所述用户设备访问所述应用可以采用的用户面网元对应的DNAI。
  25. 如权利要求23所述的方法，其特征在于，所述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中所述至少一个第二DNAI根据所述至少一个第一DNAI确定，所述至少一个第二子网信息根据所述至少一个第一DNAI或第一子网信息。
  26. 一种应用服务器的发现方法，其特征在于，包括：
    第一网络设备接收第二网络设备的第一信息，所述第一信息包括应用的标识；
    所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，所述第一接入位置为用户设备访问所述应用的候选接入位置；
    所述第一网络设备将所述至少一个第一接入位置的第一标识信息发送给所述第二网络设备；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址。
  27. 如权利要求26所述的方法，其特征在于，所述第一网络设备为会话管理网元；
    所述方法还包括：所述第一网络设备接收所述第二网络设备发送的请求信息，所述请求信息用于请求所述第一网络设备为所述用户设备选择访问所述应用的用户面网元。
  28. 如权利要求27所述的方法，其特征在于，所述请求信息还包括第二接入位置的标 识信息，所述至少一个接入位置包括所述第二接入位置。
  29. 如权利要求26-28任一项所述的方法，其特征在于，所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，包括：所述第一网络设备根据所述应用对应的数据导向控制信息、所述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定所述至少一个第一接入位置。
  30. 如权利要求29所述的方法，其特征在于，所述应用对应的数据导向控制信息由所述第一网络设备从统一数据存储库或策略控制网元获取。
  31. 如权利要求26所述的方法，其特征在于，所述第一网络设备为策略控制网元；所述第一网络设备至少根据所述第一信息确定至少一个第一接入位置，包括：
    所述第一网络设备向会话管理网元发送第二信息，所述第二信息用于请求所述用户设备访问所述应用的接入位置；
    所述第一网络设备接收所述会话管理网元发送的所述至少一个接入位置的标识信息。
  32. 如权利要求31所述的方法，其特征在于，所述至少一个第一接入位置的标识信息由所述会话管理网元根据所述应用对应的数据导向控制信息、所述用户设备当前的位置信息、运营商策略以及当前网络的负荷状况中的至少一种确定。
  33. 如权利要求32所述的方法，其特征在于，所述第一网络设备向所述会话管理网元提供所述应用对应的数据导向控制信息。
  34. 如权利要求31-33任一项所述的方法，其特征在于，所述方法还包括：所述第一网络设备接收所述第二网络设备的请求信息，所述请求信息用于请求所述会话管理网元为所述用户设备选择访问所述应用的用户面网元。
  35. 如权利要求34所述的方法，其特征在于，所述请求信息还包括第二接入位置的标识信息，所述至少一个第一接入位置包括所述第二接入位置。
  36. 如权利要求26-35任一项所述的方法，其特征在于，所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备向第一域名系统DNS服务器发送第三信息，所述第三信息中包括至少一个第一接入位置的第二标识信息，其中所述至少一个第一接入位置的第二标识信息根据所述至少一个第一接入位置的第一标识信息确定；
    所述第二网络设备接收所述第一DNS服务器发送的所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器的地址；
    所述第二网络设备从所述至少一个服务器的地址中确定第一服务器的地址。
  37. 如权利要求26-35任一项所述的方法，其特征在于，所述方法还包括：所述第一网络设备将所述至少一个第一接入位置的第一标识信息的第一优先级信息发送给所述第二网络设备；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备向第一DNS服务器发送第三信息，所述第三信息中包括至少一个第一接入位置的第二标识信息，其中所述至少一个第一接入位置的第二标识信息根据所述至少一个第一接入位置的第一标识信息确定；
    所述第二网络设备接收所述第一DNS服务器发送的所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器地址；
    所述第二网络设备根据所述第一优先级信息和所述至少一个第一接入位置的第二标识信息对应的所述应用的至少一个服务器地址确定所述第一服务器的地址。
  38. 如权利要求37所述的方法，其特征在于，所述第三信息还包括所述至少一个第一接入位置的第二标识信息对应的第二优先级信息，其中所述第二优先级信息根据所述第一优先级信息确定；所述第一DNS服务器发送的所述至少一个第一服务器的地址由所述第一DNS服务器根据所述第二优先级信息确定。
  39. 如权利要求26-35任一项所述的方法，其特征在于，所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定所述应用的第一服务器的地址，包括：
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向所述第二DNS服务器发送第四信息；所述第四信息用于获取所述第一服务器的地址；所述至少一个第一接入位置的第一标识信息包括所述第二接入位置的第一标识信息；
    所述第二网络设备接收所述第二DNS服务器发送的所述第一服务器的地址。
  40. 如权利要求39所述的方法，其特征在于，所述方法还包括：所述第一网络设备将所述至少一个第一接入位置的第一标识信息对应的优先级信息发送给所述第二网络设备；
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息确定第二接入位置对应的第二DNS服务器，并向所述第二DNS服务器发送第四信息，包括：
    所述第二网络设备根据所述至少一个第一接入位置的第一标识信息对应的优先级信息确定所述第二接入位置对应的所述第二DNS服务器，并向所述第二DNS服务器发送所述第四信息。
  41. 如权利要求26-40任一项所述的方法，其特征在于，所述方法还包括：所述第二网络设备向所述用户设备发送所述第一服务器的地址。
  42. 如权利要求26-41任一项所述的方法，其特征在于，所述一个或多个接入位置的第一标识信息为一个或多个第一数据网络接入标识DNAI和/或第一子网信息。
  43. 如权利要求42所述的方法，其特征在于，所述至少一个第一DNAI为所述用户设备访问所述应用可以采用的用户面网元对应的DNAI。
  44. 如权利要求42或43所述的方法，其特征在于，所述至少一个第一子网信息为所述用户设备访问所述应用可以采用的用户面网元对应的子网信息。
  45. 如权利要求42所述的方法，其特征在于，所述至少一个第一接入位置的第二标识信息为至少一个第二DNAI和/或第二子网信息，其中所述至少一个第二DNAI根据所述至少一个第一DNAI确定，所述至少一个第二子网信息根据所述至少一个第一DNAI或第一子网信息。
  46. 一种网络设备，其特征在于，用于执行权利要求1-13任一项所述的方法。
  47. 一种网络设备，其特征在于，用于执行权利要求14-25任一项所述的方法。
  48. 一种通信系统，其特征在于，包括第一网络设备及第二网络设备；所述第一网络设备为权利要求46所述的网络设备，所述第二网络设备为权利要求47所述的网络设备。
  49. 一种芯片，其特征在于，所述芯片包括至少一个处理器，存储器和接口电路，所述存储器、所述收发器和所述至少一个处理器通过线路互联，所述至少一个存储器中存储有指令；所述指令被所述处理器执行时，权利要求1-25任一所述的方法得以实现。
  50. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有程序指令，当所述程序指令在处理器上运行时，实现权利要求1-25任一所述的方法。
  51. 一种计算机程序产品，其特征在于，所述计算机程序产品在网络设备上运行时，权利要求1-25任一项所述的方法得以实现。
PCT/CN2021/082830 2020-03-31 2021-03-24 应用服务器的发现方法及相关装置 WO2021197175A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010247659.2 2020-03-31
CN202010247659.2A CN113473569B (zh) 2020-03-31 2020-03-31 应用服务器的发现方法及相关装置

Publications (1)

Publication Number Publication Date
WO2021197175A1 true WO2021197175A1 (zh) 2021-10-07

Family

ID=77865913

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/082830 WO2021197175A1 (zh) 2020-03-31 2021-03-24 应用服务器的发现方法及相关装置

Country Status (2)

Country Link
CN (1) CN113473569B (zh)
WO (1) WO2021197175A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114125808A (zh) * 2021-11-29 2022-03-01 中国联合网络通信集团有限公司 一种边缘应用服务器的发现方法及装置
CN114661440A (zh) * 2022-03-25 2022-06-24 Oppo广东移动通信有限公司 应用程序调度方法及装置、用户设备、存储介质

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116866884A (zh) * 2022-03-28 2023-10-10 维沃移动通信有限公司 边缘应用服务器选择的指示方法、终端及网络侧设备
CN117062144A (zh) * 2022-05-05 2023-11-14 华为技术有限公司 一种通信方法和装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018177656A1 (en) * 2017-03-31 2018-10-04 Telefonaktiebolaget Lm Ericsson (Publ) Application topology aware user plane selection in nr and 5gc
US10285155B1 (en) * 2018-09-24 2019-05-07 Cisco Technology, Inc. Providing user equipment location information indication on user plane
CN110169089A (zh) * 2017-01-05 2019-08-23 华为技术有限公司 用于应用友好型协议数据单元会话管理的系统和方法
US20200100303A1 (en) * 2018-09-25 2020-03-26 Cisco Technology, Inc. Systems and Methods for Selection of Collocated Nodes in 5G Network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108632944B (zh) * 2017-03-21 2023-07-14 中兴通讯股份有限公司 用户面功能实体的选择方法和装置
WO2018199649A1 (en) * 2017-04-27 2018-11-01 Samsung Electronics Co., Ltd. Method and apparatus for registration type addition for service negotiation
CN109413619B (zh) * 2017-08-14 2022-01-28 中兴通讯股份有限公司 信息发送、操作执行方法及装置、会话管理功能实体
CN110868762B (zh) * 2018-08-27 2022-04-12 华为技术有限公司 一种数据流处理方法、装置及系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110169089A (zh) * 2017-01-05 2019-08-23 华为技术有限公司 用于应用友好型协议数据单元会话管理的系统和方法
WO2018177656A1 (en) * 2017-03-31 2018-10-04 Telefonaktiebolaget Lm Ericsson (Publ) Application topology aware user plane selection in nr and 5gc
US10285155B1 (en) * 2018-09-24 2019-05-07 Cisco Technology, Inc. Providing user equipment location information indication on user plane
US20200100303A1 (en) * 2018-09-25 2020-03-26 Cisco Technology, Inc. Systems and Methods for Selection of Collocated Nodes in 5G Network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "S2-2001711, Edge Application Server Discovery and Selection Using DNS", 3GPP TSG-SA/WG2 MEETING #136-AH, 27 January 2020 (2020-01-27), XP051845609 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114125808A (zh) * 2021-11-29 2022-03-01 中国联合网络通信集团有限公司 一种边缘应用服务器的发现方法及装置
CN114125808B (zh) * 2021-11-29 2023-10-27 中国联合网络通信集团有限公司 一种边缘应用服务器的发现方法及装置
CN114661440A (zh) * 2022-03-25 2022-06-24 Oppo广东移动通信有限公司 应用程序调度方法及装置、用户设备、存储介质

Also Published As

Publication number Publication date
CN113473569B (zh) 2023-05-12
CN113473569A (zh) 2021-10-01

Similar Documents

Publication Publication Date Title
EP3668054B1 (en) Data transmission method, device and system
WO2021197175A1 (zh) 应用服务器的发现方法及相关装置
WO2020073855A1 (zh) 建立会话的方法和装置以及发送报文的方法和装置
WO2023011210A1 (zh) 一种获取边缘服务的方法和装置
WO2023280121A1 (zh) 一种获取边缘服务的方法和装置
US20220217611A1 (en) Service Configuration Method, Communication Apparatus, and Communication System
WO2021136211A1 (zh) 授权结果的确定方法及装置
US20220030429A1 (en) Authentication Method and Apparatus and Device
WO2020221223A1 (zh) 通信方法、装置和系统
KR20210024160A (ko) 통신 방법 및 장치
US20230156833A1 (en) Packet Forwarding Method, Apparatus, and System
US20230422016A1 (en) Network access method and apparatus
JP2023526542A (ja) 無線通信システムで端末にローカルデータネットワーク情報を提供するための方法及び装置
WO2023024931A1 (zh) 用于设备间通信的方法和装置
US20230048066A1 (en) Slice authentication method and apparatus
EP4135376A1 (en) Method and device for secure communication
US20230025344A1 (en) Application Discovery Method, Apparatus, and System, and Computer Storage Medium
WO2022242452A1 (zh) 通信方法、通信装置和计算机可读存储介质
US20240121670A1 (en) Quality of service continuity in converged networks
US20220263879A1 (en) Multicast session establishment method and network device
WO2019062533A1 (zh) 一种传输方法、接入网设备和终端设备
US20240244497A1 (en) Communication method and apparatus
WO2023124875A1 (zh) 一种通信方法及装置
EP4037368A1 (en) Communication method and communication device
US20220408502A1 (en) Communication method and apparatus

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21781218

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21781218

Country of ref document: EP

Kind code of ref document: A1