WO2018196843A1

WO2018196843A1 - Resource request method and device

Info

Publication number: WO2018196843A1
Application number: PCT/CN2018/084802
Authority: WO
Inventors: 王震宇
Original assignee: 华为技术有限公司
Priority date: 2017-04-28
Filing date: 2018-04-27
Publication date: 2018-11-01
Also published as: CN108810179A

Abstract

Disclosed in an embodiment of the present invention are a resource request method and device, in the resource request method: a signaling server may receive a service request message which is sent by a terminal and send a domain name query message to a domain name system (DNS) server; the DNS server may return access information of at least one media server which matches the Internet Protocol (IP) address of the terminal such that the signaling server may be bound to one of the media servers, sending the access information of the media server to the terminal. Hence, by implementing the embodiment of the present invention, the signaling server may be dynamically bound to a media server such that the deployment of a media resource is more flexible.

Description

Resource request method and device

The present application claims the priority of the Chinese Patent Application, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of computer technologies, and in particular, to a resource request method and apparatus.

Background technique

The traditional telecommunication system is composed of various dedicated hardware devices, and different applications use different hardware devices. With the growth of the network scale, the telecommunication system is becoming more and more complex, which brings many challenges to the development of new services and the operation and maintenance of the system. In order to solve these challenges, global telecom operators jointly promote Network Function Virtualization (NFV), which can migrate individual network element functions in a telecommunications network from a dedicated hardware platform to a general-purpose server. Each network element used is transformed into a stand-alone application that can be flexibly deployed on a unified infrastructure platform built on standards-based servers, storage, and switches.

After the network device is virtualized, the service function does not depend on specific hardware devices. It can be centralized in the data center and flexibly scaled as needed. In practice, it is found that after the network function of the telecommunication media service is virtualized, due to the different attributes of the signaling and the media resources, the signaling concentration and the distribution mode of the media resources are gradually formed. As shown in Figure 1, the coordinated distribution of multimedia services from signaling and media resources is gradually formed into signaling at the regional center, and media resources are deployed close to the edge of user access. After the centralized signaling management exceeds a certain amount of media resources, if the relationship between the signaling and the distributed media resources and the relationship between the user and the access media resources are still maintained through static configuration, the operation and maintenance will be changed. It is extremely complicated.

Summary of the invention

The embodiment of the invention provides a resource requesting method and device, which can implement decoupling between signaling and media resources through a DNS server, thereby helping to reduce the complexity of operation and maintenance.

In a first aspect, an embodiment of the present invention provides a resource request method, in which a signaling server receives a service request message sent by a terminal, and obtains a source network protocol IP of the terminal from the service request message. Addressing, and sending a domain name query message to the domain name system DNS server; receiving a response message returned by the DNS server for the domain name query message, the response message carrying the access information of the at least one media server corresponding to the source IP address; The signaling server determines the access information of the target media server corresponding to the source IP address from the access information of the at least one media server; the signaling server sends the binding information to the target media server by using the access information of the target media server And determining, after the binding to the target media server, the signaling server returns the access information of the target media server to the terminal; the access information of the target media server includes the connection of the target media server Enter the IP address and port number. It can be seen that, in the embodiment of the present invention, the signaling server can be dynamically bound to the media server, so that the deployment of the media resource is more flexible.

Optionally, the signaling server may use the unused response field in the domain name query message to carry the IP address of the terminal. For example, when the return code of the domain name query message is redefined as Ext, the value of 1 indicates that the domain name query message carries the IP address of the terminal.

Optionally, the signaling server may carry the IP address of the terminal in the domain name query message by using the home IP carrying method defined by the mobile IPv6. For example, when the IP v6 extension header uses “Next Header=60”, the extension header is used. The IP address of the terminal is carried by the associated IP address.

Optionally, the signaling server may query one or more services according to the service request message, and select, according to the access information of the at least one media server, access information of the media server that can provide multiple services, thereby reducing the need for access. Media server node.

Optionally, the signaling server does not need to maintain state information of the unbound media resource, and in the binding process, if the target media server fails to respond, the access may be based on the access of the at least one media server returned by the DNS server. The information is selected from the media server according to the priority of the media server (which may also be referred to as the priority of the media resource) as the target media server.

Optionally, during the transmission of the service flow between the terminal and the target media server, the signaling server may periodically check the status of the bound resource (or the status of the target media server). If the media resource is faulty or the target media server is faulty, The session can be re-established or terminated according to a preset policy.

In a second aspect, the embodiment of the present invention provides another resource request method, in which the domain name system DNS server receives the domain name query message sent by the signaling server, and the DNS server parses the source IP address of the terminal in the domain name query message. Corresponding domain name area and service requested by the terminal; the DNS server provides at least one media server domain name of the service according to the domain name area query; and the DNS server determines access information of the at least one media server according to the at least one media server domain name The DNS server returns a response message to the signaling server, where the response message carries the access information of the at least one media server corresponding to the source IP address.

It can be seen that the DNS server can reversely search for the domain name area corresponding to the IP address according to the IP address of the terminal, and reversely search for the service resource or the media resource or the domain name of the media server that provides the request service according to the domain name area; A domain name matching the domain name area of the IP address, and searching for the media server access information corresponding to the domain name, thereby obtaining access information of the media server capable of providing services for the terminal, and the DNS server may also determine and the terminal according to the domain name. The most suitable, for example, the access information of the nearest media server is used as the target media server, and the access information of the target media server is returned to the signaling server, so that the signaling server uses the access information to implement binding with the media resource. . Therefore, by implementing the embodiments of the present invention, not only the media resources can be dynamically bound, but also the closest media resources can be selected to provide services for the terminal.

Optionally, the DNS server parses the domain name area corresponding to the source IP address of the terminal in the domain name query message, and the DNS server queries the domain name area corresponding to the source IP address of the terminal in the A record.

Optionally, the DNS server provides the at least one media server domain name of the service according to the domain name area query, where the DNS server queries the at least one media in the SRV record that provides the service and matches the domain name area. Server domain name.

When the DNS server searches for the service resource or the domain name area of the media resource according to the domain name iterative search service, it can stop according to the policy after stopping the record or finding the record of the specified layer according to the policy, wherein the policy can find the latest service resource. The domain name is stopped immediately, and the result is returned; or, after finding two domain name records, the result is returned.

Optionally, the access information of the at least one media server includes a priority of the at least one media server, and the priority is used by the signaling server to select a target media server from the at least one media server.

Optionally, the DNS server adjusts the priority of the at least one media server according to the accuracy of the at least one media server domain name, wherein the accuracy is proportional to the priority. For example, media123.lg.sz.gd.cn has a higher priority than media123.sz.gd.cn.

Optionally, the DNS server determines the access information of the at least one media server according to the at least one media server domain name, where the DNS server queries the at least one media server corresponding to the at least one media server domain name in the A record. Access information.

Optionally, in a case that the DNS system where the DNS server is located cannot be upgraded, the DNS extension agent may be used to implement the foregoing multiple rounds of queries to implement terminal positioning of the media resource or the media server.

Optionally, when the media resources of each area are used as the disaster recovery resources for other areas, an alias with the domain name of the disaster recovery area may be added to the DNS server.

In a third aspect, an embodiment of the present invention further provides a resource requesting apparatus, where the resource requesting apparatus has a function of implementing the resource requesting method according to the first aspect. The above functions can be implemented by hardware or by executing corresponding software through hardware. The above hardware or software includes one or more modules corresponding to the above functions. For example, the resource requesting device may include a communication module, a determination module, and a query module.

In a fourth aspect, an embodiment of the present invention further provides a resource requesting apparatus, where the data processing apparatus has a function of implementing the resource requesting method according to the second aspect. The above functions can be implemented by hardware or by executing corresponding software through hardware. The above hardware or software includes one or more modules corresponding to the above functions. For example, the resource requesting device may include a communication module, a parsing module, a query module, a determining module, and an adjusting module.

In a fifth aspect, the embodiment of the present invention further provides a resource requesting device, where the resource requesting device may include a processor, a memory, and a communication interface, where the processor is respectively connected to the communication interface and the memory; the memory For storing program instructions; the processor is configured to invoke program instructions in the memory, and execute the resource request method according to the first aspect of the embodiments of the present invention.

In a sixth aspect, an embodiment of the present invention further provides a base station, where the base station may include a processor, a memory, and a communication interface, where the processor is respectively connected to the communication interface and the memory; and the memory is used to store a program. The processor is configured to invoke a program instruction in the memory, and execute the resource request method according to the second aspect of the embodiments of the present invention;

In a seventh aspect, the embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the resource request described in the foregoing aspects. method.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background art, the drawings to be used in the embodiments of the present invention or the background art will be described below.

FIG. 1 is a schematic diagram of a manner in which a media service tends to be distributed in a centralized media resource distribution according to an embodiment of the present disclosure;

2 is a system architecture diagram of a network function virtualization NFV according to an embodiment of the present invention;

3 is a schematic diagram of a resource request scenario according to an embodiment of the present invention;

4 is a schematic flowchart of a resource request method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a domain name query message format according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an IP address of a mobile IPv6 mobile terminal according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of flexible deployment of media resources according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a media resource independently opened to a third party according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic flowchart diagram of another resource request method according to an embodiment of the present invention;

FIG. 10 is a schematic flowchart of a DNS extended proxy scenario according to an embodiment of the present disclosure;

11 is a schematic flowchart of a remote disaster recovery scenario according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of still another resource request method according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic structural diagram of a resource request apparatus according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of another resource request apparatus according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a signaling server according to an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a DNS server according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are described below in conjunction with the accompanying drawings in the embodiments of the present invention.

For a better understanding of the embodiments of the present invention, a system architecture diagram of Network Function Virtualization (NFV) of the network function virtualization (NFV) of the embodiment of the present invention is described below. As shown in FIG. 2, FIG. 2 is an architectural diagram of an NFV system. The NFV system 100 can be implemented in various network environments, such as a data center network, a carrier network, or a local area network. The NFV system 100 includes a network function virtualization management and orchestration system (NFV-MANO) 101, a network function virtualization infrastructure (NFVI) 130, and multiple element management (EM). 122, multiple virtual network functions (VNF) 108, network services, VNF and infrastructure description 126 (Network Service, VNF and Infrastructure Description) and operational support system / business support system (Operation-Support System / Business Support System, OSS/BSS) 124. The network function virtualization orchestration and management system 101 includes a network function virtualization orchestrator (NFVO) 102, one or more virtual network function managers (VNF Managers, VNFM) 104, and a virtualization infrastructure manager ( Virtualized Infrastructure Manager, VIM) 106. The network function virtualization infrastructure 130 includes a hardware resource layer, a virtualization layer, and a virtual resource layer. The hardware resource layer includes computing hardware 112, storage hardware 114, and network hardware 116. The virtual resource layer includes virtual computing 110, virtual storage 118, and virtual network. 120. Network services, VNF and infrastructure descriptions 126 and operational support system/business support system 124 are further discussed in the ETSI GS NFV 002 V1.1.1 standard.

The NFV management and orchestration system 101 is used to perform monitoring and management of the virtual network function 108 and the network function virtualization infrastructure 130. Network function virtualization orchestrator 102 may implement network services (such as L2 and L3 VPN services) on network function virtualization infrastructure 130, as well as resource related requests from one or more virtual network function managers 104, to send The information is configured to the virtual network function manager 104 and the status information of the virtual network function 108 is collected. In addition, network function virtualization orchestrator 102 can communicate with virtual infrastructure manager 106 to effect resource allocation and/or reservation and to exchange configuration and status information for virtualized hardware resources. The virtual network function manager 104 can manage one or more virtual network functions 108. The virtual network function manager 104 can perform various management functions such as instantiating, updating, querying, scaling, and/or terminating the virtual network function 108 and the like. The virtual infrastructure manager 106 can perform resource management functions such as managing the allocation of infrastructure resources (eg, adding resources to containers) and operational functions (eg, collecting network function virtualization infrastructure failure information). The virtual network function manager 104 and the virtual infrastructure manager 106 can communicate with one another for resource allocation and exchange of configuration and status information for virtualized hardware resources.

The network function virtualization infrastructure 130 includes hardware resources, software resources, or a combination of both to complete the deployment of the virtualized environment. In other words, the hardware resources and virtualization layers are used to provide virtualized resources, such as virtual machines and other forms of containers, for installing virtual network functions 108. Hardware resources include computing hardware 112, storage hardware 114, and network hardware 116. Computing hardware 112 may be off-the-shelf hardware and/or user-customized hardware used to provide processing and computing resources. Storage hardware 114 may be storage capacity provided within the network or storage capacity resident in storage hardware 114 itself (local storage located within the server). In one possible implementation, computing hardware 112 and storage hardware 114 can be grouped together. Network hardware 116 can be a switch, a router, and/or any other network device configured to have switching functionality. Network hardware 116 can span multiple domains and can include multiple networks interconnected by one or more transport networks.

The virtualization layer of network function virtualization infrastructure 130 may abstract hardware resources and decouple virtual network functions 108 from the physical layer to provide virtualized resources to virtual network functions 108. The virtual resource layer includes virtual computing 110, virtual storage 118, and virtual network 120. Virtual computing 110 and virtual storage 118 may be provided to virtual network functionality 108 in the form of virtual machines and/or other containers. For example, one or more virtual network functions 108 can be deployed on a virtual machine. The virtualization layer abstract network hardware 116 forms a virtual network 120. The virtual network 120 can include a virtual switch (Virtual Switch) for providing connections between virtual machines. In addition, the transport network in network hardware 116 can be virtualized using a centralized control plane and a separate forwarding plane (eg, software defined network, SDN).

As shown in FIG. 2, virtual network function manager 104 can interact with virtual network function 108 and network element management 122 to manage the lifecycle of virtual network function 108 and to exchange configuration and status information. The virtual network function 108 can be configured to virtualize at least one network function performed by one physical network device. For example, in one implementation, the virtual network function 108 can be configured to provide functions of different network elements in an IMS (IP Multimedia Subsystem, IP Multimedia Subsystem, IMS for short) network, such as a P-CSCF (Proxy-Call Session). Control Funtion, Proxy Call Session Control Function (P-CSCF), S-CSCF (Serving-Call Session Control Funtion, PSCSCF), or HSS (Home Subscriber Server, Home Subscriber Server, HSS for short) ) Network functions, etc. The element management 122 is configured to manage one or more virtual network functions 108.

In the above NFV system, the service function does not depend on specific hardware devices, and can be concentrated in the data center to flexibly flex as needed. In practice, it is found that after the network function of the telecommunication media service is virtualized, due to the different attributes of the signaling and media resources of the telecommunication media service, the signaling concentration and the distribution mode of the media resource distribution are gradually formed.

It should be understood that, in the embodiment of the present invention, the signaling server may also be referred to as a signaling virtual network function, Signaling VNF, which is a server deployed with a signaling function, that is, a device deployed by a signaling virtual network function, and may be collectively referred to as a signaling server; Correspondingly, the media server is a server that deploys a media resource, and may also be a server that deploys a virtual network function of the media resource. The media server may also be referred to as a media resource, which is not limited in the embodiment of the present invention. For example, the media resource generally provides RTP media. Functions such as stream forwarding, audio and video codec conversion, and other functions such as IP Multimedia Subsystem (IMS). As shown in Figure 1, the signaling virtual network function can be deployed centrally, and the media resource virtual network function can be distributed to the media servers in each area. The UE in FIG. 1 is a User Equipment, which may also be called a terminal.

The DNS server is a general name of a server or a data center for deploying a DNS, which is not limited in the embodiment of the present invention.

As shown in Figure 1, the coordinated distribution of multimedia services from signaling and media resources is gradually formed into signaling at the regional center, and media resources are deployed close to the edge of user access. After the centralized signaling management exceeds a certain amount of media resources, if the relationship between the signaling and the distributed media resources and the relationship between the user and the access media resources are still maintained through static configuration, the operation and maintenance will be changed. It is extremely complicated. For example, when the user terminal sends a service request message to the signaling server, the signaling server can only query the statically configured access information of the media server that matches the area where the user terminal is located, and return the access information to the user terminal, so that The user terminal uses the access information to access the media server where the media resource is located. It can be seen that the implementation manner of the signaling server needs to maintain a large number of distributed media resources and the relationship between the user and the media resource, thereby causing the operation and maintenance to become Very complicated.

Referring to FIG. 3, the resource request method according to the embodiment of the present invention is described in detail below in conjunction with the resource request scenario shown in FIG. In the resource request scenario shown in FIG. 3, the media server where the media resource is located may be deployed in a distributed manner in the city A and the city B. The signaling server and the DNS server may be deployed in a centralized manner, where the DNS server may include multiple The related functions of the domain name system are carried out, wherein MANO or NFVO can modify the records of the media server or the media server where the media resource is located after the distributed deployment of the media resources, for example, the corresponding domain name area, or access information, etc. .

Referring to FIG. 4, FIG. 4 is a schematic flowchart of a resource requesting method according to an embodiment of the present invention. The resource requesting method shown in FIG. 4 is illustrated from a signaling server side. Specifically, the resource requesting method is provided. The steps can be included:

S401. The signaling server receives a service request message sent by the terminal, and obtains a source network protocol IP address of the terminal from the service request message.

In the embodiment of the present invention, due to different requirements of the signaling function and the media function of the telecommunication media service, such as voice and video, for example, the signaling function provides service diversity, and needs to respond quickly to the demand, so it is concentrated in the area. Center; media functions need to ensure high-quality QOS, need to be as close as possible to service, reduce delay and packet loss, so use distributed deployment. Therefore, when the terminal initiates the service request, the terminal first sends a service request message to the signaling server, so that the signaling server allocates the access information of the media server where the media resource is located to the terminal.

S402. The signaling server sends a domain name query message to the domain name system DNS server.

In the embodiment of the present invention, the domain name query message may carry the IP address of the terminal, that is, the source IP address of the service request message.

Optionally, the signaling server may use the unused response field in the domain name query message to carry the IP address of the terminal. As shown in FIG. 5, when the Return Code is redefined as Ext, the value of 1 indicates that the domain name query message carries the IP address of the terminal.

Optionally, the signaling server may also use the home IP carrying mode defined by the mobile IPv6 to carry the IP address of the terminal in the IPv6 scenario, as shown in FIG. 6 , when the IP v6 extension header uses “Next Header=60”, The extension header carries the IP address of the terminal through the associated IP address.

S403. The signaling server receives the response message returned by the DNS server for the domain name query message, where the response message carries the access information of the at least one media server corresponding to the source IP address.

S404. The signaling server determines, according to the access information of the at least one media server, access information of the target media server corresponding to the source IP address.

In the embodiment of the present invention, the media resource may also be referred to as a media service, and different media services are distinguished by service types, such as voice codec_VoiceTC, video codec_VideoTC, RTP/RTCP processing_RTP, and the signaling server may be based on the service. The request message queries one or more services, and selects access information of a media server capable of providing multiple services from access information of at least one media server, thereby reducing media server nodes that need to be accessed.

S405. The signaling server sends a binding request to the target media server by using the access information of the target media server.

S406. After the binding to the target media server is successful, the signaling server returns the access information of the target media server to the terminal. The access information of the target media server includes the access of the target media server. IP address and port number.

It can be seen that, by using the resource request method in the embodiment of the present invention, the terminal can access the target media server to obtain the media resource by using the access information of the target media server returned by the signaling server. Since the media resources in the media server can be dynamically bound to the signaling server or the terminal, the agile deployment of the media resources can be realized.

For example, when traffic in the A area increases rapidly, new media resources or media servers can be automatically deployed in the new data center in the area. The information in the signaling server does not need to be modified, and the newly deployed media resources can be subsequently used. use.

For example, the B area originally uses the media resources of the geographic center, as shown in FIG. 7 231. If the network virtualization system monitors that the local traffic of the B area is large, the other media resources may be directly deployed on the B area, as shown in FIG. 7. 228, and according to the priority of multiple media servers returned by the DNS server, the service of the B area is processed by the newly received 228, that is, in the specific implementation, the newly deployed 228 of the DNS server may be The priority can be increased; thus, the signaling server can achieve the effect of the shunt without any adjustment.

For example, since the media resource and the signaling server are no longer statically bound, the network virtualization system can independently open the media resource to the third-party application. As shown in FIG. 8, the media resource can use a universal security authentication mechanism. The resource user is authenticated, and after the authentication is passed, the media resource can be opened to the third party application 251. Among them, the third party is applied to the media resource or the media server is also connected through the RESTFUL interface, and the RESTFUL interface is an application API interface based on the URL style.

Referring to FIG. 9, FIG. 9 is a schematic flowchart diagram of another resource requesting method according to an embodiment of the present invention. The resource requesting method shown in FIG. 9 is illustrated from a DNS server side, and the DNS server records Serving the SRV record and the A record, the SRV record is used to record the server domain name providing various services; the A record is used to record the correspondence between the domain name and the IP address; the NFV control management MANO (203) or Orchestrator ( 204) After the media VNF is deployed and scaled, the record information of the media resources in the DNS can be modified.

Specifically, the resource request method may include the following steps:

S901. The domain name system DNS server receives a domain name query message sent by the signaling server.

S902, the DNS server parses a domain name area corresponding to a source IP address of the terminal in the domain name query message, and a service requested by the terminal;

S903. The DNS server queries, according to the domain name area, the domain name of the at least one media server that provides the service.

The DNS server resolves the domain name area where the terminal is located according to the IP address of the terminal. For example, the IP address of the terminal is 10.20.0.111 and the domain name is lg.sz.gd.cn. If the requested service is Media, it can be iterated according to the domain name. Service, query out media.lg.sz.gd.cn->_media.sz.gd.cn->_media.gd.cn->_media.cn, where different domain name levels represent geographic level, such as districts, cities , province, etc., the service resource representing the service or the specific area where the media server containing the service resource is located.

The DNS server searches for the service according to the domain name and searches for the domain name area of the service resource or the media resource. The policy can be stopped according to the policy after the record is stopped or the record of the specified layer is searched, wherein the policy can find the nearest service. The domain name of the resource is immediately stopped and the result is returned; or, after finding two domain name records, the result is returned.

S904. The DNS server determines, according to the at least one media server domain name, access information of the at least one media server.

S905. The DNS server returns a response message to the signaling server, where the response message carries the access information of the at least one media server corresponding to the source IP address.

It can be seen that, in the embodiment of the present invention, the DNS server can reversely search for the domain name area corresponding to the IP address according to the IP address of the terminal, and reversely search for the service resource or the media resource of the request service or the domain name of the media server according to the domain name area. Selecting a domain name matching the domain name area of the IP address from these domain names, and finding the media server access information corresponding to the domain name, thereby obtaining access information of the media server capable of providing services for the terminal, and the DNS server further The access information of the target media server is returned to the signaling server, so that the signaling server uses the access information to determine the access information that is most suitable for the terminal, for example, the most recent media server. Binding to a property. Therefore, by implementing the embodiments of the present invention, not only the media resources can be dynamically bound, but also the closest media resources can be selected to provide services for the terminal.

Optionally, in the case that the DNS system where the DNS server is located cannot be upgraded and upgraded, as shown in FIG. 10, the foregoing multiple rounds of query may be implemented by using the DNS extension agent to implement final positioning of the terminal accessing media resources, for example, an extended proxy query terminal. Access domain (domain name area corresponding to the IP address); iteratively constitutes an SRV query request according to the access domain of the terminal; and prioritizes the service resource domain name (or media server domain name) record obtained by the SRV query request; and caches these The service resource domain name makes it unnecessary for the DNS server to send a large number of query messages to search each time, reducing the loss of CPU resources.

Optionally, when the media resources of each area are used as the disaster recovery resources for other areas, you only need to add an alias with the domain name as the suffix of the disaster recovery area in the DNS server, as shown in Figure 11, ft.sz.gd The .cn resource can provide disaster recovery for the entire sz.gd.cn area; after the media_322dx3.ft.sz.gd.cn media resource is generated, the DNS also generates an alias media_322dx3.sz.gd.cn with a suffix of more than one layer domain name; According to the DNS search rule, an alias of a remote resource can be reserved as a low priority resource.

Referring to FIG. 12, FIG. 12 is a schematic diagram of still another resource request method according to an embodiment of the present invention. The resource request method is illustrated in the scenario shown in FIG. 3, where the terminal is 281 shown in FIG. 3; The server is 201 shown in FIG. 3; the DNS server is 202 shown in FIG. 3; the media server is 212, 213, 211, etc. shown in FIG. 3, and the target media server can be recorded as 211 shown in FIG. 3; The example mainly describes how the terminal 281 of the A area requests the media resource. The resource request processing procedure of the terminal 291 of the B area is similar to the terminal 281 of the A area, and will not be described in detail herein.

Optionally, the resource request method may include the following steps:

S1201: The terminal sends a service request message to the signaling server.

S1202: The signaling server receives a service request message sent by the terminal, and obtains a source network protocol IP address of the terminal from the service request message.

S1203: The signaling server sends a domain name query message to the domain name system DNS server.

S1204. The domain name system DNS server receives the domain name query message sent by the signaling server.

S1205. The DNS server parses a domain name area corresponding to a source IP address of the terminal in the domain name query message, and a service requested by the terminal.

S1206. The DNS server queries, according to the domain name area, the domain name of the at least one media server that provides the service.

S1207. The DNS server determines, according to the at least one media server domain name, access information of the at least one media server.

S1208. The DNS server returns a response message to the signaling server, where the response message carries the access information of the at least one media server corresponding to the source IP address.

S1209. The signaling server receives a response message returned by the DNS server for the domain name query message.

S1210. The signaling server determines, according to the access information of the at least one media server, access information of the target media server corresponding to the source IP address.

S1211: The signaling server sends a binding request to the target media server by using the access information of the target media server.

S1212: After the binding to the target media server is successful, the signaling server returns the access information of the target media server to the terminal; the access information of the target media server includes the access of the target media server. IP address and port number;

S1213: The terminal establishes a service flow with the target media server by using the access information of the target media server.

It can be seen that, in the embodiment of the present invention, the signaling server and the media server where the media resource is located are decoupled through DNS, and are not statically bound/configured with each other; centralized signaling management realizes dynamic of media resources through the access address of the user terminal. Search and dynamic binding; centralized signaling provides the user terminal's access address to the DNS. The unused reply field in the domain name query message or the home IP bearer defined by the mobile IPv6 can be used to carry the IP address of the terminal; the DNS passes the domain name suffix. The level identifies the distance of the media server where the media resource is located; optionally, recursively obtains the record and prioritizes it to achieve the purpose of proximity service and disaster tolerance.

The method of the embodiment of the present invention is described in detail above, and the device corresponding to the embodiment of the present invention is provided below. The device corresponding to the embodiment of the present invention may perform related processes or implementation manners in the foregoing embodiments of the present invention.

Referring to FIG. 13, FIG. 13 is a schematic structural diagram of a resource requesting apparatus according to an embodiment of the present invention, where the resource requesting apparatus shown in FIG. 13 can be implemented in a signaling server or a signaling virtual network function, and the present invention is implemented. For example, the resource requesting device may include the following modules:

The communication module 1301 is configured to receive a service request message sent by the terminal, and obtain a source network protocol IP address of the terminal from the service request message.

The communication module 1301 is further configured to send a domain name query message to the domain name system DNS server;

The communication module 1301 is further configured to receive a response message that is returned by the DNS server for the domain name query message, where the response message carries access information of at least one media server corresponding to the source IP address;

a determining module 1302, configured to determine, according to the access information of the at least one media server, access information of the target media server corresponding to the source IP address;

The communication module 1301 is further configured to send a binding request to the target media server by using the access information of the target media server;

The communication module 1301 is further configured to: after the binding with the target media server is successful, returning access information of the target media server to the terminal; the access information of the target media server includes the target media Server access IP address and port number.

Optionally, the service request message carries the source network protocol IP address of the terminal by using an unused field in the domain name system DNS query message.

Optionally, the service request message carries the source network protocol IP address of the terminal by using an IPv6 home IP extension header.

In the embodiment of the present invention, the resource requesting device shown in FIG. 13 may further include:

The query module 1303 is configured to periodically query a binding state with the target media server.

The determining module 1302 is further configured to: when the binding state fails, determine, by the at least one media resource access information, access information of the target media server corresponding to the source IP address.

It can be seen that, in the embodiment of the present invention, the terminal can access the target media server to obtain the media resource by using the access information of the target media server returned by the resource requesting device. Since the media resources in the media server can be dynamically bound to the signaling server or the terminal including the resource requesting device, the agile deployment of the media resources can be realized.

Referring to FIG. 14, FIG. 14 is a schematic structural diagram of another resource requesting apparatus according to an embodiment of the present invention. As shown in FIG. 14, the resource requesting apparatus may be implemented in a DNS server or a DNS virtual network function. Without limitation, optionally, the resource requesting device may include the following modules:

The communication module 1401 is configured to receive a domain name query message sent by the signaling server.

The parsing module 1402 is configured to parse the domain name area corresponding to the source IP address of the terminal in the domain name query message and the service requested by the terminal;

The query module 1403 is configured to query, according to the domain name area query, at least one media server domain name that provides the service;

a determining module 1404, configured to determine, according to the at least one media server domain name, access information of the at least one media server;

The communication module 1401 is further configured to return a response message to the signaling server, where the response message carries the access information of the at least one media server corresponding to the source IP address.

The access information of the at least one media server includes a priority of the at least one media server, and the priority is used by the signaling server to select a target media server from the at least one media server.

Optionally, the resource requesting device shown in FIG. 14 may further include:

The adjusting module 1405 is configured to adjust a priority of the at least one media server according to the accuracy of the at least one media server domain name, wherein the accuracy is proportional to the priority.

Optionally, the resource requesting apparatus shown in FIG. 14 may record a service SRV record for recording a server domain name providing various types of services, and the A record is used for recording between a domain name and an IP address. Correspondence relationship;

The parsing module parses the domain name area corresponding to the source IP address of the terminal in the domain name query message, which is specifically:

Querying the domain name area corresponding to the source IP address of the terminal in the A record;

The querying module provides at least one media server domain name of the service according to the domain name area query, specifically:

Querying at least one media server domain name in the SRV record that provides the service and matches the domain name area;

The determining module determines, according to the at least one media server domain name, access information of the at least one media server, specifically:

Querying access information of at least one media server corresponding to the at least one media server domain name in the A record.

The domain name of the server that provides various services in the SRV record is added with the alias of the domain name of the disaster-tolerant area.

It can be seen that, in the embodiment of the present invention, the resource requesting device may reversely search for the domain name area corresponding to the IP address according to the IP address of the terminal, and reversely search for the service resource or the media resource or the media server that provides the request service according to the domain name area. a domain name; selecting a domain name matching the domain name area of the IP address from the domain names, and searching for the media server access information corresponding to the domain name, thereby obtaining access information of the media server capable of providing services for the terminal, and requesting the resource The device may further determine, according to the domain name, the most suitable information of the terminal, for example, the access information of the nearest media server as the target media server, and return the access information of the target media server to the signaling server, so that the signaling server utilizes the access. Information is bundled with media resources. Therefore, by implementing the embodiments of the present invention, not only the media resources can be dynamically bound, but also the closest media resources can be selected to provide services for the terminal.

Referring to FIG. 15, FIG. 15 is a schematic structural diagram of a signaling server according to an embodiment of the present invention. The signaling server 1500 includes a processor 1501, a memory 1502, and a communication interface 1503. The processor 1501, the memory 1502, and the communication The interfaces 1503 are connected to each other through a bus. The memory 1502 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), and an Erasable Programmable Read Only Memory (EPROM). Or a Compact Disc Read-Only Memory (CD-ROM) for storing related instructions and data. Communication interface 1503 is for receiving and transmitting data or signaling. The processor 1501 may be one or more central processing units (CPUs). In the case that the processor 1501 is a CPU, the CPU may be a single core CPU or a multi-core CPU.

The processor 1501 in the signaling server 1500 is configured to read the program code stored in the memory 1502 and perform the following operations:

Sending a domain name query message to the domain name system DNS server, where the domain name query message carries the source network protocol IP address of the terminal that initiates the service request;

Receiving, by the DNS server, a response message returned by the domain name query message, where the response message carries access information of at least one media server corresponding to the source IP address;

Determining, by the access information of the at least one media server, access information of the target media server corresponding to the source IP address;

Sending a binding request to the target media server by using the access information of the target media server;

Returning the access information of the target media server to the terminal after the binding with the target media server is successful; the access information of the target media server includes an access IP address and a port number of the target media server .

The processor 1501 in the signaling server 1500 is configured to read the program code stored in the memory 1502, and may also perform the following operations:

Periodically querying a binding state with the target media server;

When the binding state is faulty, the access information of the target media server corresponding to the source IP address is determined again from the at least one media resource access information.

Referring to FIG. 16, FIG. 16 is a schematic structural diagram of a DNS server according to an embodiment of the present invention. The DNS server 1600 includes a processor 1601, a memory 1602, and a communication interface 1603. The processor 1601, the memory 1602, and the communication interface 1603 Connected to each other via a bus. The memory 1602 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), and an Erasable Programmable Read Only Memory (EPROM). Or a Compact Disc Read-Only Memory (CD-ROM) for storing related instructions and data. Communication interface 1603 is for receiving and transmitting data or signaling. The processor 1601 may be one or more central processing units (CPUs). In the case where the processor 1601 is a CPU, the CPU may be a single core CPU or a multi-core CPU.

The processor 1501 in the DNS server 1500 is configured to read the program code stored in the memory 1502 and perform the following operations:

Receiving a domain name query message sent by the signaling server;

Parsing a domain name area corresponding to the source IP address of the terminal in the domain name query message and a service requested by the terminal;

Providing at least one media server domain name of the service according to the domain name area query;

Determining access information of the at least one media server according to the at least one media server domain name;

And returning, by the signaling server, a response message, where the response message carries the access information of the at least one media server corresponding to the source IP address.

The processor 1501 in the DNS server 1500 is configured to read the program code stored in the memory 1502, and can also perform the following operations:

Adjusting a priority of the at least one media server according to an accuracy of the at least one media server domain name, wherein the accuracy is proportional to the priority.

In the embodiment of the present invention, the memory in the DNS server may record the service SRV record and the A record, where the SRV record is used to record the server domain name providing various services; and the A record is used to record the domain name and the IP address. Correspondence relationship

Correspondingly, the processor 1501 parses the domain name area corresponding to the source IP address of the terminal in the domain name query message, specifically: querying the domain name area corresponding to the source IP address of the terminal in the A record;

Correspondingly, the processor 1501 queries the at least one media server domain name of the service according to the domain name area query, specifically: querying at least one media server domain name that provides the service in the SRV record and matches the domain name area;

Correspondingly, the processor 1501 determines the access information of the at least one media server according to the at least one media server domain name, specifically: querying the access information of the at least one media server corresponding to the at least one media server domain name in the A record. .

Optionally, the server domain name that provides various services in the SRV record is added with the alias of the disaster recovery area domain name as a suffix. For example, when the media resources of each area are used as disaster recovery resources for other areas, you only need to add an alias with the domain name as the suffix of the disaster recovery area in the DNS server, as shown in Figure 11, ft.sz.gd.cn The resources can be used to provide disaster recovery for the entire sz.gd.cn area; after the media_322dx3.ft.sz.gd.cn media resource is generated, the DNS also generates an alias for the domain name suffix media_322dx3.sz.gd.cn; Search rules, aliases for off-site resources can be reserved as low-priority resources.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

Claims

A resource request method, comprising:

The signaling server sends a domain name query message to the domain name system DNS server, where the domain name query message carries the source network protocol IP address of the terminal that initiates the service request;

Receiving, by the signaling server, a response message returned by the DNS server for the domain name query message, where the response message carries access information of at least one media server corresponding to the source IP address;

Determining, by the signaling server, access information of the target media server corresponding to the source IP address from the access information of the at least one media server;

The signaling server sends a binding request to the target media server by using the access information of the target media server;

After the binding to the target media server, the signaling server returns the access information of the target media server to the terminal; the access information of the target media server includes the access of the target media server. IP address and port number.
The method according to claim 1, wherein the service request message carries a source network protocol IP address of the terminal by using an unused field in a domain name system DNS query message.
The method according to claim 1, wherein the service request message carries a source network protocol IP address of the terminal by using an IPv6 home IP extension header.
The method according to any one of claims 1 to 3, wherein the method further comprises:

The signaling server periodically queries a binding state with the target media server;

When the binding state fails, the signaling server determines, again from the at least one media resource access information, access information of the target media server corresponding to the source IP address.
A resource request method, comprising:

The domain name system DNS server receives the domain name query message sent by the signaling server;

The DNS server parses the domain name area corresponding to the source IP address of the terminal in the domain name query message and the service requested by the terminal;

The DNS server queries the at least one media server domain name of the service according to the domain name area query;

Determining, by the DNS server, access information of the at least one media server according to the at least one media server domain name;

The DNS server returns a response message to the signaling server, where the response message carries the access information of the at least one media server corresponding to the source IP address.
The method according to claim 5, wherein the access information of the at least one media server comprises a priority of the at least one media server, the priority being used by the signaling server from the at least one Select the target media server in the media server.
The method of claim 6 wherein the method further comprises:

The DNS server adjusts a priority of the at least one media server according to an accuracy of the at least one media server domain name, wherein the accuracy is proportional to the priority.
The method according to claim 7, wherein said DNS server records a service SRV record for recording a server domain name providing various types of services, and said A record is used for recording a domain name and Correspondence between IP addresses;

The DNS server parses the domain name area corresponding to the source IP address of the terminal in the domain name query message, including:

The DNS server queries the domain name area corresponding to the source IP address of the terminal in the A record;

The DNS server queries the at least one media server domain name of the service according to the domain name area query, including:

The DNS server queries at least one media server domain name in the SRV record that provides the service and matches the domain name area;

Determining, by the DNS server, access information of the at least one media server according to the at least one media server domain name, including:

The DNS server queries the access information of the at least one media server corresponding to the at least one media server domain name in the A record.
The method according to claim 8, wherein the server domain name of the SRV record providing various services is added with an alias of the disaster recovery area domain name as a suffix.
A resource requesting device, comprising:

The communication module is further configured to send a domain name query message to the domain name system DNS server, where the domain name query message carries a source network protocol IP address of the terminal that initiates the service request;

The communication module is further configured to receive a response message that is returned by the DNS server for the domain name query message, where the response message carries access information of at least one media server corresponding to the source IP address;

a determining module, configured to determine, according to the access information of the at least one media server, access information of the target media server corresponding to the source IP address;

The communication module is further configured to send a binding request to the target media server by using the access information of the target media server;

The communication module is further configured to: after the binding with the target media server is successful, returning access information of the target media server to the terminal; the access information of the target media server includes the target media server Access IP address and port number.
The apparatus according to claim 10, wherein the service request message carries a source network protocol IP address of the terminal by using an unused field in a domain name system DNS query message.
The apparatus according to claim 10, wherein the service request message carries a source network protocol IP address of the terminal by using an IPv6 home IP extension header.
The device according to any one of claims 10 to 12, wherein the device further comprises:

a query module, configured to periodically query a binding state with the target media server;

The determining module is further configured to: when the binding state is faulty, determine, by the at least one media resource access information, access information of the target media server corresponding to the source IP address.
A resource requesting device, comprising:

a communication module, configured to receive a domain name query message sent by the signaling server;

a parsing module, configured to parse a domain name area corresponding to a source IP address of the terminal in the domain name query message, and a service requested by the terminal;

a querying module, configured to query, according to the domain name area, at least one media server domain name that provides the service;

a determining module, configured to determine access information of the at least one media server according to the at least one media server domain name;

The communication module is further configured to return a response message to the signaling server, where the response message carries access information of the at least one media server corresponding to the source IP address.
The apparatus according to claim 14, wherein the access information of the at least one media server comprises a priority of the at least one media server, and the priority is used by the signaling server from the at least one Select the target media server in the media server.
The device according to claim 15, wherein the device further comprises:

And an adjustment module, configured to adjust a priority of the at least one media server according to an accuracy of the at least one media server domain name, wherein the accuracy is proportional to the priority.
The apparatus according to claim 16, wherein said DNS server records a service SRV record for recording a server domain name providing various types of services, and said A record is used for recording a domain name and Correspondence between IP addresses;

The parsing module parses the domain name area corresponding to the source IP address of the terminal in the domain name query message, which is specifically:

Querying the domain name area corresponding to the source IP address of the terminal in the A record;

The querying module provides at least one media server domain name of the service according to the domain name area query, specifically:

Querying at least one media server domain name in the SRV record that provides the service and matches the domain name area;

The determining module determines, according to the at least one media server domain name, access information of the at least one media server, specifically:

Querying access information of at least one media server corresponding to the at least one media server domain name in the A record.
The device according to claim 17, wherein the server domain name of the SRV record providing various types of services is added with an alias of the disaster-tolerant area domain name as a suffix.