CN115226247A

CN115226247A - Method and apparatus for wireless communication

Info

Publication number: CN115226247A
Application number: CN202110345679.8A
Authority: CN
Inventors: 胡翔; 夏渊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-21
Also published as: WO2022206683A1

Abstract

The application provides a wireless communication method and a wireless communication device, which can improve the access efficiency between terminal equipment and an application, and the method comprises the following steps: a first core network element receives a first message from a second core network element, wherein the first message is used for acquiring address information of an application instance, and the first message comprises characteristic information of the application; and the first core network element sends a second message to the second core network element according to the corresponding relation between the characteristic information of the application and the instance of the application, wherein the second message comprises the address information of the first instance of the application.

Description

Method and apparatus for wireless communication

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for wireless communication.

Background

At present, after an APP is accessed to a fifth generation (5 th generation,5 g) core network and an IP address is allocated, address information of the APP needs to be issued to a Domain Name System (DNS) server to update an IP address mapping relationship of a domain name corresponding to the APP, discovery and access of the UE and the APP are both provided with services through the DNS server, multiple operation bodies need to be matched with each other, complexity is high, and efficiency is low.

Disclosure of Invention

The application provides a wireless communication method and device, which can improve the access efficiency between terminal equipment and an application.

In a first aspect, a method of wireless communication is provided, including: a first core network element receives a first message from a second core network element, wherein the first message is used for acquiring address information of an application instance, and the first message comprises characteristic information of the application; and the first core network element sends a second message to the second core network element according to the corresponding relation between the characteristic information of the application and the instance of the application, wherein the second message comprises the address information of the first instance of the application.

Based on the above technical solution, after an application accesses a core network, address information allocated to an instance of the application is stored in a first core network element (e.g., AADF/PCF/GSMF), and if the terminal device needs to access the application, the terminal device requests the first core network element to obtain the address information of the instance of the application through a second core network element (e.g., SMF), so that access between the terminal device and the application can be realized inside the core network, thereby avoiding that the terminal device obtains the address information of the application needing to be accessed from a DNS server outside the core network, reducing complexity of access between the terminal device and the application, and improving access efficiency.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and the first core network element determines the first instance of the application according to the corresponding relation between the characteristic information of the application and the instance of the application.

With reference to the first aspect, in certain implementation manners of the first aspect, the first message further includes session feature information of the terminal device; the determining, by the first core network element, the first instance of the application according to the corresponding relationship between the characteristic information of the application and the instance of the application includes: the first core network element determines an instance corresponding to the application according to the corresponding relationship between the characteristic information of the application and the instance of the application; and the first core network element determines the first instance of the application according to the session characteristic information of the terminal equipment.

The first instance of the application is determined according to the session characteristic information of the terminal equipment, and the address information of the first instance of the application is sent to the terminal equipment, so that the address information of the instance of the application provided for the terminal equipment is more effective, and the access efficiency is improved.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first core network element, the first instance of the application according to the session feature information includes: and the first core network element determines the first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment.

With reference to the first aspect, in certain implementations of the first aspect, the session feature information of the terminal device includes at least one of the following information: the information processing method comprises the steps of slicing information of the terminal equipment, subscription information of the terminal equipment, a data network name DNN of the terminal equipment and position information of the terminal equipment.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first core network element, the first instance of the application according to the feature information of the application and the corresponding relationship of the instances of the application includes: the first core network element determines an instance corresponding to the application according to the corresponding relationship between the characteristic information of the application and the instance of the application; and the first core network element determines the first instance of the application from the multiple instances of the application according to the load conditions of the multiple instances of the application.

The first core network element determines the first instance of the application from the multiple instances of the application according to the load conditions of the multiple instances of the application, and sends the address information of the first instance of the application to the terminal equipment, so that the load of the multiple instances of the application can be shared, the situation that a certain application instance provides application services for the multiple terminal equipment at the same time is avoided, and the access efficiency can be improved.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the first core network element receives a third message from the second core network element, where the third message includes address information of the first instance of the application; and the first core network element stores the corresponding relation between the characteristic information of the application and the address information of the first instance of the application. The third message application indicates that an instance of the application is online.

With reference to the first aspect, in certain implementations of the first aspect, the third message further includes session feature information corresponding to the instance of the application.

With reference to the first aspect, in certain implementations of the first aspect, the session feature information corresponding to the instance of the application includes at least one of the following information: the application comprises slicing information corresponding to the application instance, subscription information corresponding to the application instance, a data network name DNN corresponding to the application instance, and location information corresponding to the application instance.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first core network element, the first instance of the application from the multiple instances of the application according to the session feature information of the terminal device includes: and the first core network element determines the first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment and the session characteristic information corresponding to the instance of the application.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the first core network element receives a fourth message from the second core network element, where the fourth message is used to indicate that the first instance of the application is offline; and the first core network element deletes the corresponding relation between the characteristic information of the application and the first instance of the application according to the fourth message. The corresponding relation between the characteristic information of the application and the instance of the application can be updated in time.

With reference to the first aspect, in certain implementations of the first aspect, the first core network element includes any one of: policy control function PCF, global session management function GSMF, address management and publication service function AADF; the second core network element comprises a session management function, SMF.

With reference to the first aspect, in certain implementations of the first aspect, the characteristic information of the application may include at least one of the following information: a name of the application, identification information of the application, domain name (domain) information of the application.

In a second aspect, a method of wireless communication is provided, including: a second core network element receives a fifth message, wherein the fifth message is used for requesting address information of an application instance; the second core network element acquires the address information of the first instance of the application; and the second core network element sends a sixth message, wherein the sixth message comprises address information of the first instance of the application.

Based on the above technical solution, when the terminal device needs to access the application, the address information of the instance of the application may be acquired through the second core network element (e.g., SMF), and the access between the terminal device and the application may be realized inside the core network, thereby avoiding that the terminal device acquires the address information of the application needing to be accessed from a DNS server outside the core network, reducing the complexity of the access between the terminal device and the application, and improving the access efficiency.

With reference to the second aspect, in some implementation manners of the second aspect, the obtaining, by the second core network element, address information of the instance of the application includes: the second core network element sends a first message to a first core network element, wherein the first message is used for acquiring address information of an application instance, the first message comprises the characteristic information of the application, and the characteristic information of the application is used for determining the first instance of the application; the second core network element receives a second message from the first core network element, where the second message includes address information of the first instance of the application.

With reference to the second aspect, in some implementations of the second aspect, the fifth message includes feature information of the application.

With reference to the second aspect, in some implementations of the second aspect, the receiving, by the second core network element, a fifth message includes: the second core network element receives the fifth message from the terminal device; the second core network element sends a sixth message, including: and the second core network element sends the sixth message to the terminal equipment.

With reference to the second aspect, in some implementations of the second aspect, the receiving, by the second core network element, a fifth message includes: the second core network element receives the fifth message from a User Plane Function (UPF); the second core network element sends a sixth message, including: and the second core network element sends the sixth message to the UPF.

After the session is established, if the terminal device needs to access the application, the address information of the instance of the application is requested to be acquired from the first core network element through the UPF and the second core network element, the access between the terminal device and the application can be realized inside the core network, the terminal device is prevented from acquiring the address information of the application needing to be accessed from a DNS server outside the core network, the complexity of the access between the terminal device and the application is reduced, and the access efficiency is improved.

With reference to the second aspect, in some implementations of the second aspect, before the second core network element receives the second message from the first core network element, the method further includes: and the second core network element sends a third message to the first core network element, wherein the third message comprises address information of the application instance, and the third message is used for indicating that the first instance of the application is online.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and the second core network element sends a fourth message to the first core network element, wherein the fourth message is used for indicating that the first instance of the application is offline.

With reference to the second aspect, in some implementations of the second aspect, the first message further includes session feature information of the terminal device, and the session feature information of the terminal device is used to determine the first instance of the application. The session feature information of the terminal device includes at least one of the following information: the slicing information of the terminal equipment, the subscription information of the terminal equipment, the data network name DNN of the terminal equipment and the position information of the terminal equipment.

With reference to the second aspect, in some implementations of the second aspect, the fifth message includes a protocol data unit PDU session establishment request message, or a protocol data unit PDU session modification request message, or a protocol data unit PDU session application information query request message; the sixth message includes a protocol data unit PDU session setup response message, or a protocol data unit PDU session modification response message, or a protocol data unit PDU session application information query response message.

With reference to the second aspect, in some implementations of the second aspect, the first core network element includes any one of: policy control function PCF, global session management function GSMF, address management and publication service function AADF; the second core network element comprises a session management function, SMF.

With reference to the second aspect, in some implementations of the second aspect, the characteristic information of the application may include at least one of the following information: a name of the application, identification information of the application, domain name (domain) information of the application.

In a third aspect, a method of wireless communication is provided, including: the terminal equipment sends a fifth message to a second core network element, wherein the fifth message is used for requesting address information of an application instance; and the terminal equipment receives a sixth message from the second core network element, wherein the sixth message comprises address information of the first instance of the application.

With reference to the third aspect, in some implementations of the third aspect, the fifth message includes feature information of the application.

In a fourth aspect, a method of wireless communication is provided, comprising: the terminal equipment sends a seventh message to a User Plane Function (UPF), wherein the seventh message is used for requesting address information of an application instance, and the seventh message comprises the characteristic information of the application; and the terminal equipment receives an eighth message from the UPF, wherein the eighth message comprises the address information of the first instance of the application.

With reference to the fourth aspect, in some implementations of the fourth aspect, before the terminal device sends the seventh message to the user plane function UPF, the method further includes: the terminal equipment sends a ninth message to a second core network element, wherein the ninth message is used for requesting the address information of the UPF; and the terminal equipment receives a tenth message from the second core network element, wherein the tenth message comprises the address information of the UPF.

In a fifth aspect, a method of wireless communication is provided, including: receiving a seventh message from a terminal device by a User Plane Function (UPF), wherein the seventh message is used for requesting address information of an application instance, and the seventh message comprises the characteristic information of the application; the UPF sends a fifth message to a second core network element, wherein the fifth message is used for requesting address information of the application instance; the UPF receives a sixth message from the second core network element, wherein the sixth message comprises address information of the first instance of the application; and the UPF sends an eighth message to the terminal equipment, wherein the eighth message comprises the address information of the first instance of the application.

With reference to the fifth aspect, in some implementations of the fifth aspect, the fifth message includes feature information of the application.

In a sixth aspect, a communication apparatus is provided, including: a receiving and sending unit, configured to receive a first message from a second core network element, where the first message is used to obtain address information of an instance of an application, and the first message includes feature information of the application; the transceiver unit is further configured to send a second message to the second core network element according to the correspondence between the characteristic information of the application and the instance of the application, where the second message includes address information of the first instance of the application.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the apparatus further comprises: and the processing unit is used for determining the first instance of the application according to the corresponding relation between the characteristic information of the application and the instance of the application.

With reference to the sixth aspect, in some implementations of the sixth aspect, the first message further includes session feature information of the terminal device; the processing unit is specifically configured to: determining an instance corresponding to the application according to the corresponding relation between the characteristic information of the application and the instance of the application; and determining a first instance of the application according to the session characteristic information of the terminal equipment.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the processing unit is further specifically configured to: and determining a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment.

With reference to the sixth aspect, in some implementations of the sixth aspect, the session feature information of the terminal device includes at least one of the following information: the information processing method comprises the steps of slicing information of the terminal equipment, subscription information of the terminal equipment, a data network name DNN of the terminal equipment and position information of the terminal equipment.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the processing unit is specifically configured to: determining an instance corresponding to the application according to the corresponding relation between the characteristic information of the application and the instance of the application; determining a first instance of the application from the multiple instances of the application according to load conditions of the multiple instances of the application.

With reference to the sixth aspect, in some implementations of the sixth aspect, the transceiver unit is further configured to receive a third message from the second core network element, where the third message includes address information of the first instance of the application; the processing unit is further configured to store a correspondence between the feature information of the application and the address information of the first instance of the application.

With reference to the sixth aspect, in some implementations of the sixth aspect, the transceiver unit is further configured to receive a fourth message from the second core network element, where the fourth message is used to indicate that the first instance of the application is offline; the processing unit is further configured to delete, according to the fourth message, a correspondence between the feature information of the application and the first instance of the application.

With reference to the sixth aspect, in some implementations of the sixth aspect, the second core network element includes a session management function, SMF; the first core network element includes any one of: policy control function PCF, global session management function GSMF, address management and distribution service function AADF.

In a seventh aspect, a communication apparatus is provided, including: a transceiving unit, configured to receive a fifth message, where the fifth message is used to request address information of an instance of an application; a processing unit for obtaining address information of a first instance of the application; the transceiver unit is further configured to send a sixth message, where the sixth message includes address information of the first instance of the application.

With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver unit is specifically configured to: sending a first message to a first core network element, where the first message is used to acquire address information of an application instance, the first message includes characteristic information of the application, and the characteristic information of the application is used to determine the first instance of the application; receiving a second message from the first core network element, the second message including address information of the first instance of the application.

With reference to the seventh aspect, in some implementations of the seventh aspect, the fifth message includes feature information of the application.

With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver unit is specifically configured to: receiving the fifth message from a terminal device; and sending the sixth message to the terminal equipment.

With reference to the seventh aspect, in some implementations of the seventh aspect, the fifth message is received from a user plane function; and sending the sixth message to the UPF.

With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver unit is further configured to send a third message to the first core network element, where the third message includes address information of the first instance of the application, and the third message is used to indicate that the first instance of the application is online.

With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver unit is further configured to send a fourth message to the first core network element, where the fourth message is used to indicate that the first instance of the application is offline.

With reference to the seventh aspect, in some implementations of the seventh aspect, the first message further includes session feature information of a terminal device, and the session feature information of the terminal device is used to determine the first instance of the application.

With reference to the seventh aspect, in some implementations of the seventh aspect, the fifth message includes a protocol data unit PDU session establishment request message, or a protocol data unit PDU session modification request message, or a protocol data unit PDU session application information query request message; the sixth message includes a protocol data unit PDU session setup response message, or a protocol data unit PDU session modification response message, or a protocol data unit PDU session application information query response message.

In an eighth aspect, there is provided a communication apparatus comprising: a transceiving unit, configured to send a fifth message to a second core network element, where the fifth message is used to request address information of an instance of an application, and the fifth message includes feature information of the application; the transceiver unit is further configured to receive a sixth message from the second core network element, where the sixth message includes address information of the first instance of the application.

In a ninth aspect, there is provided a communication apparatus comprising: a transceiving unit, configured to send a seventh message to a user plane function UPF, where the seventh message is used to request address information of an instance of an application, and the seventh message includes feature information of the application; the transceiver unit is further configured to receive an eighth message from the UPF, where the eighth message includes address information of the first instance of the application.

With reference to the ninth aspect, in some implementations of the ninth aspect, the transceiver unit is further configured to: sending a ninth message to a second core network element, where the ninth message is used to request address information of the UPF; and receiving a tenth message from the second core network element, wherein the tenth message comprises the address information of the UPF.

In a tenth aspect, there is provided a communication apparatus comprising: a receiving and sending unit, configured to receive a seventh message from a terminal device, where the seventh message is used to request address information of an instance of an application, and the seventh message includes feature information of the application; the transceiver unit is further configured to send a fifth message to a second core network element, where the fifth message is used to request address information of an instance of the application, and the fifth message includes the feature information of the application; the transceiver unit is further configured to receive a sixth message from the second core network element, where the sixth message includes address information of the first instance of the application; the transceiver unit is further configured to send an eighth message to the terminal device, where the eighth message includes address information of the first instance of the application.

In an eleventh aspect, there is provided a communication device comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, such as the first aspect or the method in any possible implementation manner of the first aspect.

In a twelfth aspect, there is provided a communication device comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, such as the second aspect or the method in any possible implementation of the second aspect.

In a thirteenth aspect, there is provided a communication device comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, such as the method of the third aspect or any possible implementation of the third aspect.

In a fourteenth aspect, a communication device is provided, comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, such as the method in the fourth aspect or any possible implementation manner of the fourth aspect.

In a fifteenth aspect, a communication device is provided, comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, such as the method of the fifth aspect or any possible implementation of the fifth aspect.

In a sixteenth aspect, there is provided a communication system comprising: the first core network element of the method of the first aspect or the second aspect, and other communication devices in communication with the first core network element, the second core network element, and other communication devices in communication with the second core network element.

In a seventeenth aspect, there is provided a computer readable storage medium having a computer program stored thereon; the computer program, when executed on a computer, causes the computer to perform the method of any possible implementation of the first to fifth aspects or the first to fifth aspects.

Drawings

Fig. 1 is a schematic diagram of a 5G core network system architecture.

Fig. 2 is a schematic diagram of the architecture of the ULCL in 3 GPP.

Fig. 3 is an architecture diagram of BP in 3 GPP.

Fig. 4 is a basic DNS query flow diagram.

Fig. 5 is a schematic flow chart interaction diagram of a method of wireless communication in an embodiment of the present application.

Fig. 6 is a schematic flow chart interaction diagram of a method of wireless communication in an embodiment of the present application.

Fig. 7 is a schematic flow chart interaction diagram of a method of wireless communication in an embodiment of the present application.

Fig. 8 is a schematic flow chart interaction diagram of a method of wireless communication in an embodiment of the present application.

Fig. 9 is a schematic flow chart interaction diagram of another method of wireless communication in an embodiment of the application.

Fig. 10 is a schematic block diagram of a communication apparatus according to an embodiment of the present application.

Fig. 11 is a schematic block diagram of another communication device according to an embodiment of the present application.

Fig. 12 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.

Fig. 13 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.

Fig. 15 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 16 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The embodiments of the present application can be applied to various communication systems, such as Wireless Local Area Network (WLAN), narrowband internet of things (NB-IoT), global system for mobile communications (GSM), enhanced data rate GSM evolution (EDGE), wideband Code Division Multiple Access (WCDMA), code division multiple access (code division multiple access, CDMA 2000), time division synchronous code division multiple access (TD-SCDMA), long term evolution (long term evolution, LTE), satellite communication, fifth generation (5 g), or future communication systems.

The terminal devices referred to in embodiments of the present application may include various handheld devices, vehicle mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capability. The terminal may be a Mobile Station (MS), a subscriber unit (subscriber unit), a User Equipment (UE), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (handset), a laptop computer (laptop computer), a Machine Type Communication (MTC) terminal, or the like.

The 5G core network architecture is switched into a service architecture, network Function (NF) entity network elements can communicate through a service interface or a point-to-point interface to complete functions of corresponding terminal registration, session establishment/update/deletion, position mobile switching, slicing, policy management, capability opening and the like, and key characteristics are as follows:

the decoupling and integration among network functions are realized through modularization, and each decoupled network function is abstracted into the service of the network, is independently expanded, independently evolved and deployed according to requirements.

The interaction between all the NF of the control surface adopts a service interface, the same service can be called by multiple NF, the coupling degree of interface definition between the NF is reduced, the customization of the whole network function as required is finally realized, and different service scenes and requirements are flexibly supported.

As shown in fig. 1, a 5G core network system architecture diagram is shown. Wherein, include: an access and mobility management function (AMF) for performing an access authentication and mobility management control function; session Management Function (SMF); authentication service function (AUSF); a Network Slice Selection Function (NSSF) for selecting a network slice to be used for the UE; a network capability exposure function (NEF) for opening network capabilities and services to the outside; a network function repository (NRF) for functions such as service registration, discovery, and authorization; a Policy Control Function (PCF) that implements a policy decision function; unified Data Management (UDM) for unifying databases and storing user's subscription data, etc.; application Function (AF); a User Plane Function (UPF) for executing functions such as forwarding of user plane data.

In order to select a deployment position more flexibly in a 5G network, traffic flow deployed at the edge is not detoured due to the fact that the position of a core network is too high. When the third generation partnership project (3 rd generation partnership project,3 gpp) formulates the 5G core network user plane service, a new user plane ULCL/Branch Point (BP) function which is not supported by the Electronic Product Code (EPC) of 4G is added.

As shown in fig. 2, a schematic diagram of the architecture of the ULCL in 3GPP is shown. The architecture of the UPF uplink classifier (ULCL) by 3GPP is defined as follows: a new upstream classifier can be inserted between the Radio Access Network (RAN) and the UPF of the PDU session anchor, as defined by its name, and the ULCL functions as an upstream classifier of the data flow, i.e. it shunts data to the local Data Network (DN) or to the remote UPF session anchor based on the identification of the upstream characteristics of the traffic flow. Meanwhile, ULCL/BP also requires downstream aggregation processing.

As shown in fig. 3, a schematic diagram of the architecture of BP in 3GPP is shown. The function of BP is the same as that of ULCL, except that BP is inserted into a split point of internet protocol version six (IPv 6), and IPv6 has a little difference between the user plane and internet protocol version four (IPv 4): for an IPv4 or IPv6 type PDU session, the PDU session anchor may be an IP anchor assigned to the IP address/prefix of the UE. Wherein, for an IPv4 type PDU session or a PDU session of IPv6 that is not multi-homed, when multiple PDU session anchor points are used (since the ULCL is inserted), only one PDU session anchor point is the IP anchor point. However, for an IPv6 Multi-homed PDU session, there may be multiple IP anchors.

According to RFC4191, the SMF can send routing rules to the UE at any time during the lifetime of an IPv6 multi-homed PDU session for influencing the selection of the source IP address prefix in an IPv6 routing broadcast message.

To facilitate an understanding of the present application, a Domain Name System (DNS) will be briefly described.

The DNS defines protocol specifications for name resolution for Transmission Control Protocol (TCP)/Internet Protocol (IP) networks by request for comments (RFC) 1034, 1035. DNS is an application-level protocol, a core service of the internet, that can act as a distributed database that maps domain names and IP addresses to each other.

On the Internet network, users remember friendly and easily remembered domain names, but computers in the network access each other through IP addresses, and DNS is most commonly used to provide resolution services for users to resolve their domain names into IP addresses that can be accessed on the network, i.e. standard queries or forward queries. For example, the http:// www.tom.com website address is resolved to an IP address: 202.108.12.68.

the DNS domain name system generally consists of two parts: one part is a client (client) program which runs on the host of the user; the other part is a server-side (server) program which is positioned on a host computer at the server side. The DNS server realizes domain name resolution service and provides domain name IP dynamic update service. Each domain name space within a DNS server is referred to as a Zone (Zone). And establishing a corresponding forward and reverse resolution data file by the domain name governed by the DNS server.

The DNS namesystem generally uses two modes, namely TCP and User Datagram Protocol (UDP), to implement communication between a client and a DNS server, and may use an encryption technique to perform encrypted transmission in order to prevent transmission content from being stolen. In order to enhance the security of the DNS server, prevent malicious attacks, and prevent the contents of the DNS database from being maliciously tampered with, a response server is usually provided in front of the DNS server, all requests of the user directly contact the response server, and the DNS server only accepts requests from the response server. The direct contact between the user and the DNS server is isolated, so that the safety of the system is improved. We generally refer to DNS servers and response servers together as DNS servers.

The DNS server supports the inquiry modes of TCP and UDP protocols, and the default of ports on RFC is 53. Most queries are UDP queries because UDP is faster and reduces the load on the server.

There are three cases where a TCP query is required:

one is that when the query data is too large to generate data truncation (the response packet header field TC is marked as 1), the DNS server may send a response message on the TCP port, and use the fragmentation capability of TCP to perform data transmission.

Secondly, when communication is performed between a master (master) server and a slave (slave) server, namely updating is performed between the server zones, reliable transmission is required, and TCP transmission is required.

Thirdly, the DNS server can use TCP connection, the DNS client side uses TCP to initiate DNS request, and then the DNS server returns DNS response data of TCP load.

When the client uses a new IP address, the client needs to apply for updating the IP address corresponding to the domain name from the DNS server. After receiving the updated data from client end, DNS server firstly inquires data base to confirm whether the domain name of client end is legally existed or not, if it is not, it can not ignore, if it is legally existed, DNS server stores the correspondent domain name updated message in the data base by means of command mode, then it is reflected to DNS superior server by means of synchronous update, at the same time the correspondent information in the data base is updated. The transmission of the user information to the DNS server is completed, and the dynamic update is realized.

When we set up the network environment of the hosts, we tell each host the DNS server address (either manually configured on each client host or using DHCP assignments). With this DNS server address, the host can request resolution of a domain name or host name from the DNS server and return a response to its corresponding IP address or other client host request type.

As shown in fig. 4, a basic DNS query flow diagram is shown. The DNS client interacts with an opposite terminal through a target website pop.tom.com, firstly, the DNS client sends a DNS request to a DNS server of the DNS client to obtain a message, and the DNS server returns a query result to inform the DNS client that the IP address of a domain name to be queried is as follows: 202.108.255.203, the DNS client then interacts with the peer with the target web address pop.

At present, after an Application (APP) is accessed to a 5G core network and an IP address is allocated, address information of the APP needs to be issued to a DNS server outside the core network to update an IP address mapping relationship of a domain name corresponding to the APP, discovery and access of the UE and the APP are services provided by the DNS server outside the core network, multiple operation bodies are required to cooperate with each other, complexity is high, and efficiency is low.

Therefore, the application provides a wireless communication method, an APP can be accessed into a core network as a special terminal, and a network element in the core network implements address allocation after the APP is accessed, so that access between the UE and the APP in the 5G core network is realized, and the efficiency of access between the UE and the APP can be improved.

It should be emphasized that, the embodiment of the present application takes a 5G core network as an example, but the present application is not limited to a 5G core network, and is also applicable to future network architectures (for example, sixth generation networks).

As shown in fig. 5, a schematic flow chart interaction diagram of a method of wireless communication of an embodiment of the application is shown.

And the application is accessed into a 5G core network, and the SMF or UPF supports the allocation of an address for the application, the creation of a data plane forwarding path and a routing strategy. An IP address or a Media Access Control (MAC) address allocated by the SMF or the UPF for the application may be reported to an application address management and distribution service function (AADF), where the AADF is an entity with a new independent function that can uniformly manage addresses of different applications; the address of the application may also be reported to the PCF or a Global Session Management Function (GSMF). Wherein, the application is an APP server which can provide service for APP at the terminal side.

And 510, when the terminal device needs to access the application, sending a fifth message to the second core network element, where the fifth message is used to request address information of an instance of the application that the terminal device needs to access, in other words, the fifth message may be used to acquire or subscribe address information of an instance of the application that the terminal device needs to access. It should be understood that an application may include multiple instances corresponding to the application, with different instances of the application being used to provide different APP services; the second core network element is, for example, an SMF, and the SMF is an SMF corresponding to the terminal device.

Optionally, the fifth message includes feature information of the application. The characteristic information of the application may include at least one of the following information: application name (application name), application identification information, application domain name (domain) information, and the like. The identification information of the application may be an identification uniquely determining the application, and is similar to a subscription permanent identifier (SUPI) of the terminal, a temporary mobile subscriber identity (IMSI), and the like.

Since the terminal device supports querying and subscribing address information of an application list concerned by the terminal device in the registration or session establishment process, the terminal device may request address information of an instance of an application to be accessed from an SMF corresponding to the terminal device in a session establishment procedure of the terminal device. Therefore, the fifth message may be a protocol data unit session establishment request (PDU session establishment request) message, and the PDU session establishment request message carries the feature information of the application to be accessed, so as to obtain the address information of the application instance.

If the terminal device needs to access a specific application after establishing a session, a protocol data unit session modification request (PDU session modification request) message or a PDU session APP info query request (PDU session APP info query) message may be actively sent to request address information of an instance of the application to be accessed. Therefore, the fifth message may also be a PDU session modification request message or a PDU session APP info request message.

Optionally, the fifth message may further include session feature information of the terminal device. The session characteristic information of the terminal equipment comprises at least one of the following information: slice information of the terminal device, subscription information of the terminal device, a Data Network Name (DNN) of the terminal device, location information of the terminal device, a session and service continuity (session and service continuity) mode of the terminal device, and the like.

And 520, the second core network element receives the fifth message sent by the terminal device.

The second core network element obtains 530 address information of the first instance of the application.

Specifically, the second core network element sends a first message to the first core network element, where the first message is used to obtain address information of an instance of an application, the first message includes characteristic information of the application, and the characteristic information of the application is used to determine the first instance of the application.

Optionally, the first core network element may be an AADF, or may also be a PCF or a GSMF.

Optionally, the first message may further include session feature information of the terminal device, and the session feature information of the terminal device may also be used to determine the first instance of the application.

540, the first core network element receives the first message sent by the second core network element.

In one implementation, the first core network element may determine the first instance of the application according to the correspondence between the characteristic information of the application and the instance of the application. The first core network element stores the corresponding relation between the characteristic information of the application and the address information of the application instance.

Specifically, optionally, the first core network element may determine the instance corresponding to the application according to the correspondence between the characteristic information of the application and the instance of the application, where the instance corresponding to the application may be one or multiple instances. When the application corresponds to a plurality of instances, the first core network element may determine the first instance of the application from the plurality of instances of the application according to load conditions of the plurality of instances of the application. For example, the first core network element may perform load sharing selection on multiple instances of the application according to the number of terminal users, the number of bandwidths, or the load state of the instances of the application, which have been allocated to each instance of the application, to determine the first instance of the application, so as to prevent an instance of a certain application from providing an application service for multiple terminal devices at the same time. The first example of this application is the preferred example.

It should be understood that the first instance of the application may include only one instance, or may include multiple instances of the application.

In another implementation manner, the first core network element may determine an application-corresponding instance according to the correspondence between the application feature information and the application instance; and determining a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment. For example, according to the position information of the terminal device, the position information supported by the first instance of the application is determined from the multiple instances of the application and comprises the position information of the terminal device, and then the first instance of the application is determined from the multiple instances of the application.

After the application accesses the 5G core network (or after the application is online), the SMF or the UPF may allocate an address to the instance of the application, and after the SMF or the UPF allocates an address to the instance of the application, the address information of the instance of the application may be stored in the first core network element.

Take SMF (second core network element) as an example. The SMF that assigns an address to the instance of the application and the SMF corresponding to the session of the terminal device may be the same SMF or different SMFs. In the embodiment of the present application, it is assumed that the same SMF, that is, the second core network element, allocates address information to an application that the terminal device needs to access.

After the SMF allocates the address to the first instance of the application, the SMF may further send a third message to the first core network element, where the third message includes the feature information of the application and the address information of the first instance of the application. And the first core network element receives the third message from the SMF and stores the corresponding relation between the characteristic information of the application and the address information of the first instance of the application. It is to be understood that the third message may be used to inform the first core network element that the first instance of the application is online. Optionally, the network element that allocates the address information for the instance of the application may also be a UPF, and after the UPF allocates the address for the first instance of the application, the UPF may send the address information of the first instance of the application to the first core network element, and the first core network element receives the address information of the first instance of the application from the UPF.

Optionally, the third message may further include session feature information corresponding to the instance of the application. Wherein the session characteristic information of the application instance comprises at least one of the following information: slice information corresponding to the application instance, subscription information corresponding to the application instance, DNN corresponding to the application instance, location information corresponding to the application instance, and session and service continuity (session and service continuity) mode corresponding to the application instance.

The determining, by the first core network element, the first instance of the application from the multiple instances of the application according to the session feature information of the terminal device may specifically include: and the first core network element determines a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment and the session characteristic information corresponding to the instances of the application. The session characteristic information corresponding to the first instance of the application and the session characteristic information of the terminal equipment have common characteristic information.

Optionally, the first core network element may divide the virtual service network according to the common attribute in the session feature information of different terminal devices and the session feature information of the application instance.

In another implementation manner, the first core network element may determine an application-corresponding instance according to the correspondence between the application feature information and the application instance; and determining a first instance of the application which belongs to the same virtual service network with the terminal equipment from the multiple instances of the application according to the session characteristic information of the terminal equipment.

When a certain instance of the application goes offline, the first core network element may further send a fourth message to the second core network element, where the fourth message is used to indicate that the instance of the application goes offline, and the offline of the instance of the application may be understood as that the instance of the application does not provide an application service; and the second core network element receives the fourth message sent by the first core network element, and deletes the corresponding relation between the characteristic information of the application and the application instance according to the fourth message. Therefore, the correspondence between the characteristic information of the application stored in the network element of the second core network and the instance of the application is dynamically updated.

And 550, the first core network element sends a second message to the second core network element, where the second message includes address information of the first instance of the application. The second message may include only address information of the first instance of the application, or may include address information of multiple instances of the application. When the second message includes the address information of the multiple instances of the application, the second message may further include the address information of the preferred instance and the address information of the next-selected instance, and the address information of the multiple instances of the application may be used for the terminal device to perform access selection.

If the application requested to be accessed by the terminal equipment has been accessed into the 5G core network, namely the address information has been allocated to the instance of the application, and the corresponding relation between the characteristic information of the application and the address information of the instance of the application has been stored in the first core network element, the first core network element directly sends a second message to the second core network element according to the received first message, wherein the second message comprises the address information of the first instance of the application.

If the application requested to be accessed by the terminal equipment is not accessed into the 5G core network, namely address information is not allocated to the instance of the application, the first core network element records the list information of the application requested to be accessed by the terminal equipment according to the characteristic information of the application in the first message; after the application which the terminal equipment requests to access is accessed into the 5G core network and address information is allocated to the application, the first core network element sends a second message to the second core network element, and the second message comprises the address information of the first instance of the application.

And 560, the second core network element receives the second message sent by the first core network element, and acquires the address information of the first instance of the application that the terminal device needs to access according to the second message.

570, the second core network element sends a sixth message to the terminal device, where the sixth message includes address information of the first instance of the application. It should be understood that the sixth message may further include address information of other instances of the application, for example, address information of the second instance of the application, address information of the third instance of the application, and the like, and when the sixth message includes address information of multiple instances of the application, the sixth message may further include address information of a preferred instance and address information of a next-selected instance, and the address information of the multiple instances of the application may be used by the terminal device for access selection.

If, in the session establishment procedure of the terminal device, the terminal device requests, to the second core network element, address information of an instance of an application that the terminal device needs to access, the sixth message may be a protocol data unit session establishment response (PDU session establishment response) message, where the PDU session establishment response message carries address information of an instance of an application that the terminal device needs to access.

If the terminal device requests, to the second core network element, address information of an instance of an application that the terminal device needs to access after the terminal device establishes a session, the sixth message may be a protocol data unit PDU session modification response (PDU session modification response) message, or a protocol data unit PDU session application information query response (PDU session APP info query response) message.

It should be understood that, in a session establishment procedure of a terminal device, a unified data management function (UDM) may obtain list information of applications that the terminal device needs to access from subscription information, and send the list information of the applications that the terminal device needs to access to a second core network element, where the second core network element may forward the list information to a first core network element through a first message to perform a subscription or query operation. The first core network element may actively send the address information of the instance of the application to be accessed by the terminal device to the second core network element, and the second core network element sends the address information to the terminal device, at this time, the terminal device supports receiving the address information of the instance of the application actively pushed by the first core network element. That is, under the condition that the terminal device does not send the fifth message for requesting the address information of the instance of the application needing to be accessed to the first core network element, the method supports receiving the address information of the instance of the application actively pushed by the first core network element.

Optionally, the first core network element may divide a virtual service network based on the session characteristic information of different terminal devices and a common attribute in the session characteristic information of the application instance, and allocate an identifier or a name to the virtual service network; the first core network element may actively push the address information of the first instance of the application to a terminal device in the same virtual service network as the application based on access subscription information or subscription information of different terminal devices. Wherein the first core network element supports returning address information for one or more instances of the application.

Specifically, the first core network element may actively push address information of an instance of the application to a terminal device in the same virtual service network as the application through a second core network element (SMF) by extending a new cell through a registration update procedure or a session update procedure.

The first core network element may also send a terminal routing policy (URSP) rule to the terminal device in the same virtual service network as the application through the AMF, where the URSP rule includes address information of the application instance, and the AMF is enabled to actively push the address information of the application instance to the terminal device through an N1 interface between the AMF and the terminal device.

In the technical scheme provided by the application, after an application is accessed to a 5G core network, address information allocated to the application instance is stored in a first core network element (AADF/PCF/GSMF), if the terminal equipment needs to access the application, the terminal equipment requests the first core network element to acquire the address information of the application instance through a second core network element (SMF), so that access between the terminal equipment and the application can be realized inside the core network, the terminal equipment is prevented from acquiring the address information of the application needing to be accessed from a DNS (domain name system) server outside the core network, the complexity of access between the terminal equipment and the application is reduced, and the access efficiency is improved.

Fig. 6 shows a schematic flow interaction diagram of a method for wireless communication according to an embodiment of the present application, based on the method shown in fig. 5.

During the registration or session establishment process, the terminal device may request address information of an instance of an application to be accessed from an SMF corresponding to the terminal device. The specific process is as follows:

and 610, the terminal device sends a protocol data unit session establishment request message to the SMF corresponding to the terminal device, where the protocol data unit session establishment request message is used to request address information of an instance of an application that the terminal device needs to access, and the protocol data unit session establishment request message includes characteristic information of the application.

The smf receives a protocol data unit session establishment request message sent by the terminal device 620.

The smf obtains address information for the first instance of the application 630,.

Specifically, the SMF sends a first message to a first core network element, where the first message is used to acquire address information of an instance of an application, and the first message includes characteristic information of the application.

And 640, the first core network element receives the first message sent by the SMF.

In another implementation manner, the first core network element may determine an application-corresponding instance according to the correspondence between the application feature information and the application instance; and determining a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment.

And 650, the first core network element sends a second message to the SMF, wherein the second message comprises the address information of the first instance of the application.

660, the smf receives the second message sent by the first core network element, and acquires the address information of the first instance of the application that the terminal device needs to access according to the second message.

670, the smf sends a protocol data unit session setup response message to the terminal device, the protocol data unit session setup response message including address information of the first instance of the application.

It should be understood that, the implementation method in the embodiment of the present application may specifically refer to the method in the embodiment of fig. 5, and details are not described herein.

Fig. 7 is a schematic flow chart of a method of wireless communication according to an embodiment of the present application, which is based on the method shown in fig. 5.

After establishing the session, the terminal device may request address information of an instance of an application to be accessed from an SMF corresponding to the terminal device. The specific process is as follows:

710, the terminal device sends a protocol data unit session modification request message to the SMF corresponding to the terminal device, where the protocol data unit session modification request message is used to request address information of an instance of an application that the terminal device needs to access, and the protocol data unit session modification request message includes feature information of the application.

The smf receives a protocol data unit session modification request message sent by the terminal device 720.

730, the smf obtains address information for the first instance of the application.

Specifically, the SMF sends a first message to a first core network element, where the first message is used to acquire address information of an instance of an application, and the first message includes feature information of the application.

740, the first core network element receives the first message sent by the SMF.

In one implementation, the first core network element may determine the first instance of the application according to the correspondence between the characteristic information of the application and the instance of the application. The first core network element stores the corresponding relation between the characteristic information of the application and the address information of the instance of the application.

And 750, the first core network element sends a second message to the SMF, wherein the second message comprises address information of the first instance of the application.

760,SMF receives a second message sent by the first core network element, and acquires the address information of the first instance of the application which the terminal equipment needs to access according to the second message.

770, the smf sends a protocol data unit session modification response message to the terminal device, the protocol data unit session modification response message including address information of the first instance of the application.

As shown in fig. 8, a schematic flow chart interaction diagram of a method of wireless communication of an embodiment of the application is shown.

810, the terminal device sends a protocol data unit session application information query request message to the SMF corresponding to the terminal device, where the protocol data unit session application information query request message is used to request address information of an instance of an application that the terminal device needs to access, and the protocol data unit session application information query request message includes characteristic information of the application.

820, SMF receives a protocol data unit session application information query request message sent by a terminal device.

830, the smf obtains address information for the first instance of the application.

840, the first core network element receives the first message sent by the SMF.

And 850, the first core network element sends a second message to the SMF, wherein the second message comprises the address information of the first instance of the application.

860, the smf receives a second message sent by the network element of the first core network, and acquires, according to the second message, address information of the first instance of the application that the terminal device needs to access.

870, the smf sends a protocol data unit session application info query response message to the terminal device, the protocol data unit session application info query response message including the address information of the first instance of the application.

It should be understood that, the implementation method in the embodiment of the present application may specifically refer to the method in the embodiment of fig. 5, and details are not described herein. The application provides another wireless communication method, which can also realize the access between the UE and the APP in the 5G core network, and improve the access efficiency between the UE and the APP.

As shown in fig. 9, a schematic flow chart interaction diagram of another method of wireless communication of an embodiment of the application is shown.

And the application is accessed into a 5G core network, and the SMF or UPF supports the allocation of an address for the application, the creation of a data plane forwarding path and a routing strategy. An IP address or a Media Access Control (MAC) address allocated by the SMF or the UPF for the application may be reported to an application address management and distribution service function (AADF), where the AADF is an entity with a new independent function that can uniformly manage addresses of different applications; the address of the application may also be reported to the PCF or the global session management function GSMF. Wherein, the application is an APP server which can provide service for APP at the terminal side.

And 910, after the PDU session is established, when the application needs to be accessed, the terminal device sends a seventh message to the UPF, where the seventh message is used to request address information of an instance of the application that the terminal device needs to access, and the seventh message includes feature information of the application that the terminal device needs to access. Wherein, the UPF is a UPF providing session service for the terminal device.

Alternatively, the format of the seventh message may be a standard DNS request message or a custom message.

Before the terminal device sends the seventh message to the UPF, it needs to determine address information (IP address) of the UPF providing the session service for the terminal device, in other words, it needs to determine address information for providing a user plane signaling channel.

Specifically, optionally, when the terminal device establishes an initial session, a ninth message may be sent to the second core network element, where the ninth message is used to request address information of a UPF or address information of a user plane signaling channel, which provides a session service for the terminal device, and the ninth message may include session feature information of the terminal device. The ninth message may be a PDU session setup request message. The second core network element may be an SMF, and the SMF is an SMF corresponding to the terminal device.

The second core network element may request the first core network element to acquire address information of a UPF or address information of a user plane signaling channel that provides a session service for the terminal device. The first core network element stores the corresponding relation between the characteristic information of the UPF and the address information of the UPF.

The first core network element may determine, according to the session feature information of the terminal device, address information of a UPF that provides a session service for the terminal device; and sending address information of the UPF providing the session service for the terminal device to a second core network element. Optionally, the first core network element may determine, according to the session feature information of the terminal device, a virtual service network to which the first core network element belongs, and send address information of a user plane signaling channel provided by the virtual service network to the terminal device.

And after receiving the address information of the UPF or the address information of the user plane signaling channel which is sent by the first core network element and used for providing the session service for the terminal equipment, the second core network element sends a tenth message to the terminal equipment, wherein the tenth message comprises the address information of the UPF or the address information of the user plane signaling channel which is used for providing the session service for the terminal equipment. The tenth message may be a PDU session setup response message. The terminal device receives a tenth message sent by the second core network element, and sends a seventh message for requesting address information of an instance of an application that needs to be accessed to the UPF according to address information of a UPF that provides session service for the terminal device or address information of a user plane signaling channel included in the tenth message.

In some realizable manners, the terminal device side may already configure address information of the UPF or address information of the user plane signaling channel, and then may directly send the seventh message to the UPF according to the configured address information of the UPF or address information of the user plane signaling channel without sending a ninth message for requesting the address information of the UPF or address information of the user plane signaling channel to the second core network element. This is not limited in this application.

920, the upf receives a seventh message sent by the terminal device, and sends a fifth message to the second core network element according to the received seventh message, where the fifth message is used to request address information of an instance of an application that the terminal device needs to access, and the fifth message includes feature information of the application; in other words, the fifth message may be used to obtain or subscribe to address information of an instance of an application that the terminal device needs to access. It should be understood that an application may include multiple instances to which the application corresponds.

The characteristic information of the application may include at least one of the following information: application name (application name), application identification information, application domain name (domain) information, and the like. The identification information of the application may be an identification uniquely determining the application, and may be information similar to a subscription permanent identifier (SUPI) of the terminal, a temporary mobile subscriber identity (IMSI), and the like.

The fifth message may be an N4 session reporting request (N4 session reporting request) message, or an application information query request (APP info query request) message newly added to the N4 interface.

930, the second core network element receives the fifth message sent by the UPF.

940, the second core network element acquires the address information of the application instance to be accessed by the terminal device according to the received fifth message.

Specifically, the second core network element sends a first message to the first core network element, where the first message is used to obtain address information of an instance of the application, and the first message includes feature information of the application.

Optionally, the first message may further include session feature information of the terminal device. The session characteristic information of the terminal equipment comprises at least one of the following information: slice information of the terminal device, subscription information of the terminal device, a Data Network Name (DNN) of the terminal device, location information of the terminal device, and a session and service continuity (session and service continuity) mode of the terminal device.

950, the first core network element receives the first message sent by the second core network element.

Specifically, optionally, the first core network element may determine the instance corresponding to the application according to the correspondence between the characteristic information of the application and the instance of the application, where the instance corresponding to the application may be one or multiple instances. When the application corresponds to a plurality of instances, the first core network element may determine the first instance of the application from the plurality of instances of the application according to load conditions of the plurality of instances of the application. For example, the first core network element may perform load sharing selection on multiple instances of the application according to the number of terminal users, the number of bandwidths, or the load state of the instances of the application, which have been allocated to each instance of the application, to determine the first instance of the application, where the first instance of the application is a preferred instance. It should be understood that the first instance of the application may include only one instance, or may include multiple instances of the application.

After the application accesses the 5G core network, the SMF or the UPF may allocate an address to the instance of the application, and after the SMF or the UPF allocates an address to the instance of the application, the address information of the instance of the application may be stored in the first core network element.

After the second core network element allocates the address to the first instance of the application, the second core network element may further send a third message to the first core network element, where the third message includes the characteristic information of the application and the address information of the first instance of the application. The first core network element receives the third message from the second core network element, and stores the corresponding relationship between the characteristic information of the application and the address information of the first instance of the application. It is to be appreciated that the third message may be for informing the first core network element that the first instance of the application is online. Optionally, the network element that allocates the address information for the instance of the application may also be a UPF, and after the UPF allocates the address for the first instance of the application, the UPF may send the address information of the first instance of the application to the first core network element, and the first core network element receives the address information of the first instance of the application from the UPF.

The determining, by the first core network element, the first instance of the application from the multiple instances of the application according to the session feature information of the terminal device may specifically include: and the first core network element determines a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment and the session characteristic information corresponding to the instance of the application. The session characteristic information corresponding to the first instance of the application and the session characteristic information of the terminal equipment have common characteristic information.

960, the first core network element sends a second message to the second core network element, the second message comprising address information of the first instance of the application. The second message may include only address information of the first instance of the application, or may include address information of multiple instances of the application. When the second message includes the address information of the multiple instances of the application, the second message may further include the address information of the preferred instance and the address information of the next-selected instance, and the address information of the multiple instances of the application may be used for the terminal device to perform access selection.

If the application requested to be accessed by the terminal equipment has been accessed into the 5G core network, namely the address information has been allocated to the instance of the application, and the corresponding relation between the characteristic information of the application and the address information of the instance of the application has been stored in the network element of the first core network, the network element of the first core network directly sends a second message to the network element of the second core network according to the received first message, wherein the second message comprises the address information of the first instance of the application.

970, the second core network element receives the second message sent by the first core network element, and acquires the address information of the first instance of the application that the terminal device needs to access according to the second message.

980, the second core network element sends a sixth message to the UPF, and the sixth message includes the address information of the first instance of the application. It should be understood that the sixth message may further include address information of other instances of the application, for example, address information of the second instance of the application, address information of the third instance of the application, and the like, and when the sixth message includes address information of multiple instances of the application, the sixth message may further include address information of a preferred instance and address information of a next-selected instance, and the address information of the multiple instances of the application may be used by the terminal device for access selection.

The sixth message may be an N4 session reporting response (N4 session reporting response) message, or an APP info query response (APP info query) message added to the N4 interface.

990, the upf receives the sixth message sent by the network element of the second core network, and sends an eighth message to the terminal device, where the eighth message includes address information of the first instance of the application, and is used for the terminal device to access the first instance of the application.

It should be understood that the UPF providing the session service for the terminal device may store the address information of the instance of the application that the terminal device requests to access, in which case the UPF may directly send the address information of the instance of the application to the terminal device without sending a seventh message for requesting the address information of the application to the second core network element.

It should be understood that, in a session establishment procedure of a terminal device, a unified data management function (UDM) may obtain list information of applications that the terminal device needs to access from subscription information, and send the list information of the applications that the terminal device needs to access to a second core network element, and the second core network element may forward the list information of the applications that the terminal device needs to access to the first core network element through a first message to perform a subscription or query operation. The first core network element may actively send the address information of the instance of the application to be accessed by the terminal device to the second core network element, and the second core network element sends the address information to the terminal device, at this time, the terminal device supports receiving the address information of the instance of the application actively pushed by the first core network element. That is, under the condition that the terminal device does not send the seventh message for requesting the address information of the instance of the application that needs to be accessed to the first core network element, the terminal device supports receiving the address information of the instance of the application actively pushed by the first core network element.

In the technical scheme provided by the application, after an application is accessed to a core network, address information allocated to an application instance is stored in a first core network element (for example, AADF/PCF/GSMF), and if the terminal device needs to access the application, the terminal device requests the first core network element to acquire the address information of the application instance through a UPF and a second core network element (for example, SMF) that provide session services for the terminal device, so that access between the terminal device and the application can be realized inside the core network, the terminal device is prevented from acquiring the address information of the application needing to be accessed from a DNS server outside the core network, the complexity of access between the terminal device and the application is reduced, and the access efficiency is improved.

An embodiment of the present application proposes a communication apparatus, and as shown in fig. 10, a schematic block diagram of a communication apparatus 1000 according to an embodiment of the present application is shown. The apparatus may be applied to the first core network element in this embodiment. The communication apparatus 1000 includes:

a transceiving unit 1010, configured to receive a first message from a second core network element, where the first message is used to acquire address information of an instance of an application, and the first message includes feature information of the application;

the transceiving unit 1010 is further configured to send a second message to the second core network element according to the correspondence between the characteristic information of the application and the instance of the application, where the second message includes address information of the first instance of the application.

Optionally, the communication device 1000 further includes: a processing unit 1020, configured to determine the first instance of the application according to the feature information of the application and the corresponding relationship of the instance of the application.

Optionally, the first message further includes session feature information of the terminal device;

the processing unit 1020 is specifically configured to: determining an instance corresponding to the application according to the corresponding relation between the characteristic information of the application and the instance of the application; and determining a first instance of the application according to the session characteristic information of the terminal equipment.

Optionally, the processing unit 1020 is further specifically configured to: and determining a first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment.

Optionally, the session feature information of the terminal device includes at least one of the following information: the slicing information of the terminal equipment, the subscription information of the terminal equipment, the data network name DNN of the terminal equipment and the position information of the terminal equipment.

Optionally, the processing unit 1020 is specifically configured to: determining an instance corresponding to the application according to the corresponding relation between the characteristic information of the application and the instance of the application; determining a first instance of the application from the multiple instances of the application according to load conditions of the multiple instances of the application.

Optionally, the transceiver 1010 is further configured to receive a third message from the second core network element, where the third message includes address information of the first instance of the application;

the processing unit 1020 is further configured to store a corresponding relationship between the feature information of the application and the address information of the first instance of the application.

Optionally, the transceiver 1010 is further configured to receive a fourth message from the second core network element, where the fourth message is used to indicate that the first instance of the application is offline;

the processing unit 1020 is further configured to delete the corresponding relationship between the feature information of the application and the first instance of the application according to the fourth message.

Optionally, the second core network element includes a session management function SMF; the first core network element includes any one of: policy control function PCF, global session management function GSMF, address management and distribution service function AADF.

Another communication apparatus according to the embodiment of the present application is provided, and as shown in fig. 11, a schematic block diagram of a communication apparatus 1100 according to the embodiment of the present application is shown. The apparatus may be applied to the second core network element in this embodiment. The communication apparatus 1100 includes:

a transceiving unit 1110, configured to receive a fifth message, where the fifth message is used to request address information of an instance of an application, and the fifth message includes feature information of the application;

a processing unit 1120, configured to obtain address information of an instance of the application;

the transceiving unit 1110 is further configured to send a sixth message, where the sixth message includes address information of the first instance of the application.

Optionally, the transceiver 1110 is specifically configured to: sending a first message to a first core network element, wherein the first message is used for acquiring address information of an application instance, and the first message comprises characteristic information of the application; receiving a second message from the first core network element, the second message including address information of the first instance of the application.

Optionally, the transceiver 1110 is specifically configured to: receiving the fifth message from a terminal device; and sending the sixth message to the terminal equipment.

Optionally, the transceiver 1110 is specifically configured to: receiving the fifth message from a User Plane Function (UPF); and sending the sixth message to the UPF.

Optionally, the transceiver 1110 is further configured to send a third message to the first core network element, where the third message includes address information of the first instance of the application, and the third message is used to indicate that the first instance of the application is online.

Optionally, the transceiver 1110 is further configured to send a fourth message to the first core network element, where the fourth message is used to indicate that the first instance of the application is offline.

Optionally, the first message further includes session feature information of the terminal device.

Optionally, the fifth message includes a protocol data unit PDU session establishment request message, or a protocol data unit PDU session modification request message, or a protocol data unit PDU session application information query request message; the sixth message comprises a protocol data unit PDU session establishment response message, or a protocol data unit PDU session modification response message, or a protocol data unit PDU session application information inquiry response message.

Another communication apparatus according to the embodiment of the present application is provided, and as shown in fig. 12, a schematic block diagram of a communication apparatus 1200 according to the embodiment of the present application is shown. The device can be applied to the terminal equipment in the embodiment of the application. The communication apparatus 1200 includes:

a transceiving unit 1210, configured to send a fifth message to a second core network element, where the fifth message is used to request address information of an instance of an application, and the fifth message includes feature information of the application;

the transceiver 1210 is further configured to receive a sixth message from the second core network element, where the sixth message includes address information of the first instance of the application.

Another communication apparatus according to the embodiment of the present application is provided, and as shown in fig. 13, a schematic block diagram of a communication apparatus 1300 according to the embodiment of the present application is shown. The device can be applied to the terminal equipment in the embodiment of the application. The communication apparatus 1300 includes:

a transceiving unit 1310, configured to send a seventh message to a user plane function UPF, where the seventh message is used to request address information of an instance of an application, and the seventh message includes feature information of the application;

the transceiving unit 1310 is further configured to receive an eighth message from the UPF, where the eighth message includes address information of the first instance of the application.

Optionally, the transceiver 1310 is further configured to: sending a ninth message to a second core network element, where the ninth message is used to request address information of the UPF; and receiving a tenth message from the second core network element, where the tenth message includes the address information of the UPF.

Another communication apparatus according to the embodiment of the present application is provided, and as shown in fig. 14, a schematic block diagram of a communication apparatus 1400 according to the embodiment of the present application is shown. The device can be applied to the user plane function UPF in the embodiment of the present application. The communication device 1400 includes:

a transceiving unit 1410, configured to receive a seventh message from a terminal device, where the seventh message is used to request address information of an instance of an application, and the seventh message includes feature information of the application;

the transceiving unit 1410 is further configured to send a fifth message to a second core network element, where the fifth message is used to request address information of an instance of the application, and the fifth message includes the feature information of the application;

the transceiving unit 1410 is further configured to receive a sixth message from the second core network element, where the sixth message includes address information of the first instance of the application;

the transceiving unit 1410 is further configured to send an eighth message to the terminal device, where the eighth message includes address information of the first instance of the application.

An embodiment of the present application provides a communication device 1500, and as shown in fig. 15, a schematic block diagram of a communication device 1500 according to an embodiment of the present application is shown.

The apparatus 1500 includes: a processor 1510 and a transceiver 1520, the transceiver 1520 being configured to receive computer code or instructions and transmit the computer code or instructions to the processor 1510, the processor 1510 executing the computer code or instructions, such as a method in any possible implementation manner in an embodiment of the present application.

The processor 1510 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware thereof to complete the steps of the method.

The embodiment of the present application provides a communication system 1600, which includes a first core network element 1610, a second core network element 1620, a terminal device 1630, and a user plane function 1640 in the wireless communication method provided in the embodiment of the present application. As shown in fig. 16, a schematic block diagram of a communication system 1600 of an embodiment of the present application is shown.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program for implementing the method in the above method embodiment is stored. When the computer program runs on a computer, the computer is enabled to implement the method in the above-described method embodiments.

In addition, the term "and/or" in the present application is only one kind of association relationship describing the associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the term "may mean" one "and" two or more "in this application, for example, A, B and C, may mean: a exists alone, B exists alone, C exists alone, A and B exist together, A and C exist together, C and B exist together, A and B exist together, and A, B and C exist together, which are seven cases.

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

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising:

a first core network element receives a first message from a second core network element, wherein the first message is used for acquiring address information of an application instance, and the first message comprises characteristic information of the application;

and the first core network element sends a second message to the second core network element according to the corresponding relation between the characteristic information of the application and the instance of the application, wherein the second message comprises the address information of the first instance of the application.

2. The method of claim 1, further comprising:

and the first core network element determines the first instance of the application according to the corresponding relation between the characteristic information of the application and the instance of the application.

3. The method according to claim 2, wherein the first message further includes session feature information of the terminal device;

the determining, by the first core network element, the first instance of the application according to the corresponding relationship between the characteristic information of the application and the instance of the application includes:

the first core network element determines an instance corresponding to the application according to the corresponding relationship between the characteristic information of the application and the instance of the application;

and the first core network element determines the first instance of the application according to the session characteristic information of the terminal equipment.

4. The method of claim 3, wherein the determining, by the first core network element, the first instance of the application based on the session feature information comprises:

and the first core network element determines the first instance of the application from the multiple instances of the application according to the session characteristic information of the terminal equipment.

5. The method according to claim 3 or 4, wherein the session feature information of the terminal device comprises at least one of the following information:

the information processing method comprises the steps of slicing information of the terminal equipment, subscription information of the terminal equipment, a data network name DNN of the terminal equipment and position information of the terminal equipment.

6. The method according to any one of claims 2 to 5, wherein the determining, by the first core network element, the first instance of the application according to the feature information of the application and the corresponding relationship between the instances of the application, comprises:

and the first core network element determines the first instance of the application from the multiple instances of the application according to the load conditions of the multiple instances of the application.

7. The method according to any one of claims 1 to 6, further comprising:

the first core network element receives a third message from the second core network element, where the third message includes address information of the first instance of the application;

and the first core network element stores the corresponding relation between the characteristic information of the application and the address information of the first instance of the application.

8. The method according to any one of claims 1 to 7, further comprising:

the first core network element receives a fourth message from the second core network element, where the fourth message is used to indicate that the first instance of the application is offline;

and the first core network element deletes the corresponding relation between the characteristic information of the application and the first instance of the application according to the fourth message.

9. The method according to any one of claims 1 to 8,

the first core network element includes any one of: policy control function PCF, global session management function GSMF, address management and publication service function AADF;

the second core network element comprises a Session Management Function (SMF).

10. A method of wireless communication, comprising:

a second core network element receives a fifth message, wherein the fifth message is used for requesting address information of an application instance;

the second core network element acquires the address information of the first instance of the application;

and the second core network element sends a sixth message, wherein the sixth message comprises address information of the first instance of the application.

11. The method of claim 10, wherein the obtaining, by the second core network element, address information of the instance of the application comprises:

the second core network element sends a first message to a first core network element, wherein the first message is used for acquiring address information of an application instance, the first message comprises the characteristic information of the application, and the characteristic information of the application is used for determining the first instance of the application;

the second core network element receives a second message from the first core network element, where the second message includes address information of the first instance of the application.

12. Method according to claim 10 or 11, characterized in that the fifth message comprises feature information of the application.

13. The method according to any one of claims 10 to 12,

the second core network element receiving a fifth message, including: the second core network element receives the fifth message from the terminal device;

the second core network element sends a sixth message, including: and the second core network element sends the sixth message to the terminal equipment.

14. The method according to any one of claims 10 to 12,

the second core network element receives a fifth message, which includes: the second core network element receives the fifth message from a User Plane Function (UPF);

the second core network element sends a sixth message, which includes: and the second core network element sends the sixth message to the UPF.

15. The method according to any of claims 11 to 14, wherein before the second core network element receives the second message from the first core network element, the method further comprises:

and the second core network element sends a third message to the first core network element, wherein the third message includes address information of the first instance of the application, and the third message is used for indicating that the first instance of the application is online.

16. The method according to any one of claims 11 to 15, further comprising:

and the second core network element sends a fourth message to the first core network element, wherein the fourth message is used for indicating that the first instance of the application is offline.

17. The method according to any of claims 11 to 16, wherein the first message further comprises session feature information of a terminal device, and the session feature information of the terminal device is used for determining the first instance of the application.

18. The method according to any one of claims 10 to 17,

the fifth message comprises a Protocol Data Unit (PDU) session establishment request message, or a Protocol Data Unit (PDU) session modification request message, or a Protocol Data Unit (PDU) session application information query request message;

the sixth message comprises a protocol data unit PDU session establishment response message, or a protocol data unit PDU session modification response message, or a protocol data unit PDU session application information inquiry response message.

19. A communication apparatus, characterized by comprising means for implementing the functionality of the method according to any of claims 1 to 9.

20. A communication apparatus, characterized in that it comprises means for implementing the functionality of the method according to any one of claims 10 to 18.

21. A communication device, comprising: a processor and a transceiver for receiving computer code or instructions and transmitting the computer code or instructions to the processor, the processor executing the computer code or instructions, the method of any of claims 1 to 18.

22. A communication system, comprising:

a first core network element performing the method of any of claims 1 to 9 and further communication equipment in communication with the first core network element; or

A second core network element performing the method of any of claims 10 to 18 and further communication equipment in communication with the second core network element.

23. A computer-readable storage medium, comprising:

the computer readable medium stores a computer program;

the computer program, when run on a computer, causes the computer to perform the method of any one of claims 1 to 18.