CN101146068B - Private network user and system and method for network intercommunication with QoS network - Google Patents
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Abstract
The invention relates to a system and a method of intercommunication between private network users and business service quality guarantee network. The invention has the core that: in independent bearing control layer network, a bearing control layer entity and an application entity can acquire corresponding address (port) conversion information by an address conversion gateway NAPT-GW; and then, allocate resources for the private users correctly based on the address (port) conversion information. Therefore, the realization of the invention can facilitate all function entities to correctly process the delivery and conversion of the private addresses and reach the purpose of correct addressing and resources allocation, in order to effectively solve the problems of difficulty of correct end to end QoS resources allocation of the private network addresses used by users and no guarantee for end to end business QoS.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a system and a method for intercommunication between a private network user and a network for ensuring the quality of service.
Background
With the increasing scale of the Internet, various network services are disputed, and advanced multimedia systems are in the endlessly. Because the real-time service is sensitive to the characteristics of network transmission delay, delay jitter and the like, when the network has services such as an FTP (file transfer protocol) with high burstiness or an HTTP (hypertext transfer protocol) containing image files and the like, the real-time service is greatly influenced; on the other hand, multimedia services occupy a large amount of bandwidth, so that critical services to be guaranteed by the existing network are difficult to be reliably transmitted.
Based on the above-described current situation, various QoS (quality of service) techniques have been developed. The IETF has proposed many service models and mechanisms to meet the QoS requirements. It is now well accepted by the industry to use the integrated service model (Int-Serv) at the access and edge of the network and the differentiated service model (Diff-Serv) at the core of the network.
Although the differentiated services model (Diff-serv) only sets priority level guarantee QoS measures, the specific effect is difficult to predict although the wire route has the characteristic of high utilization rate. Therefore, the industry starts to introduce an independent bearer control layer for the differentiated services Diff-Serv of the backbone network, and establish a set of special Diff-Serv QoS signaling mechanisms, for example, in order to promote the application of Diff-Serv, the Bandwidth Broker (Bandwidth Broker) model is used to realize network resource and topology management on the QBone test network promoted by IETF and some manufacturers and research institutions, and other manufacturers propose similar QoS server/resource manager technology to manage topology resources and coordinate QoS capabilities of various differentiated services Diff-Serv areas.
The method is that a differentiated service Diff-Serv network is specially used for establishing a resource management layer to manage the topological resources of the network, and because the traditional Diff-Serv definition has limitation, in order to avoid confusion, the resource management differentiated service Diff-Serv model is changed into a network model with an independent bearing control layer (or a centralized resource control layer).
As shown in fig. 1, in a network model with an independent bearer control layer, a bearer network control server (including a Bandwidth Broker (Bandwidth Broker) or a QoS server/resource manager) configures management rules and a network topology, and applies for allocating resources for a service Bandwidth of a client. The bearer network control servers of each management domain transmit service bandwidth application requests and results of clients and path information distributed for service application by the bearer network resource manager through signaling.
When the bearer control layer processes the service bandwidth application of the user, the path of the user service is determined. The bearer network resource manager will inform the edge router to forward the service flow according to the designated path.
How a bearer network realizes user service flow forwarding according to a specified route according to a path determined by a bearer control layer, the existing technology in the industry at present mainly utilizes an MPLS technology, establishes an LSP along a service flow path specified by the bearer control layer by using a resource reservation mode, and establishes an end-to-end LSP by using an explicit routing mechanism of RSVP-TE or CR-LDP.
The implementation scheme can strictly ensure the end-to-end QoS required by the service. However, the above scheme does not consider how to achieve end-to-end QoS guarantee when the user IP address is a private address. In addition, in the practical network application process, because the number of the IPv4 addresses is limited, a dynamic address allocation mode is adopted in many networks to allocate private network addresses to users.
When a private network user interacts with an external user, a corresponding private network address needs to be converted into a public network address through a network address (port) conversion function, and then the private network address and the public network address are communicated with the external user.
It can be seen that, for the above reasons, at present, the private network user only assigned with the private network address cannot interwork with the service quality assurance network to ensure the end-to-end service quality.
Disclosure of Invention
In view of the problems existing in the prior art, an object of the present invention is to provide a system and a method for interworking a private network user with a network for guaranteeing quality of service, so that the private network user to which only a private network address is assigned can interwork with the network for guaranteeing quality of service, thereby achieving end-to-end quality of service assurance.
The purpose of the invention is realized by the following technical scheme:
the invention provides a system for the intercommunication of private network users and networks for ensuring the quality of service, which comprises a private network, a network for ensuring the quality of service and an address translation gateway, wherein the information interacted between the private network and the networks for ensuring the quality of service is sent to an opposite terminal network after being subjected to address translation processing by the address translation gateway, the network for ensuring the quality of service is a network with a bearing control layer, and the network for ensuring the quality of service comprises a bearing control function entity, an application function entity, a strategy decision function entity and a bearing transmission function entity.
The address translation gateway can be set independently, and also can be set in a network entity of a network for ensuring the service quality.
The private network user is connected with the application or service boundary control function entity in the network for ensuring the service quality of service or the policy decision function entity PDF/bearer control function entity BCF directly or through an address translation gateway.
The invention also provides a method for the intercommunication between the private network user and the network for ensuring the service quality, which comprises the following steps:
when information interaction is carried out between a private network and a network for ensuring the service quality of the service, the information is sent to an opposite terminal network after address conversion processing is carried out on the information, the network for ensuring the service quality of the service is a network with a bearing control layer, and the network for ensuring the service quality of the service comprises a bearing control function entity, an application function entity, a strategy decision function entity and a bearing transmission function entity.
When a private network user initiates a request message, the method specifically comprises the following steps:
A. a private network user sends service information to a network for ensuring the service quality;
B. after receiving the service request information, an entity in the network for ensuring the service quality applies for acquiring the public network address information of the private network user from the address translation gateway;
C. and establishing connection between the private network user and the opposite terminal in the network for protecting the service quality of the service based on the connection by utilizing the public network address information, and carrying out information interaction between the private network user and the opposite terminal in the network for protecting the service quality.
The step A comprises the following steps: the private network user sends the service information containing the calling identity information to the application or service boundary control function entity in the network for ensuring the service quality.
The step B comprises the following steps:
the application or service boundary control function entity determines the address information as the private network address according to the identity information carried in the information sent by the private network user;
the application or service boundary control function entity applies for a public network address for the private network user from the address conversion gateway, and the address conversion gateway distributes a corresponding public network address for the private network user and returns the public network address to the application or service boundary control function entity.
The step B comprises the following steps:
the application or service boundary control function entity determines the address information as the private network address according to the identity information carried in the information sent by the private network user;
an application or service boundary control functional entity initiates a request message for applying a public network address to a policy decision functional entity PDF/bearer control functional entity BCF;
the PDF/BCF applies for a public network address for the private network user from the address conversion gateway, distributes a corresponding public network address for the private network user by the address conversion gateway, and returns to the PDF/BCF;
and the PDF/BCF continuously returns the public network address to the application or service boundary control function entity for storage, or stores the public network address on the PDF/BCF.
The step C further comprises the following steps: and applying for private network resources for the private network users by using the corresponding private network addresses and applying for public network resources for the private network users by using the corresponding public network addresses on the PDF/BCF.
The step B also comprises the following steps:
the application or service boundary control function entity carries the private network address of the private network user and directly or sends a request for applying a public network address to the address conversion gateway through PDF/BCF;
the address translation gateway distributes corresponding public network addresses for the private network addresses, and returns the corresponding relation information of the private network addresses and the public network addresses to the application or service boundary control function entity;
or,
the application or service boundary control function entity carries the number of the public network addresses required by the application or service boundary control function entity, directly or through PDF/BCF, initiates a request for applying the public network addresses to the address translation gateway, and acquires a group of public network addresses returned by the address translation gateway;
the application or service boundary control function entity needs to establish the corresponding relation between each private network address and the public network address and transmit the corresponding relation to the address translation gateway for media stream transmission when needed.
The step C comprises the following steps:
the application or service boundary control function entity saves the corresponding relation between the private address of the private network user and the distributed public network address, and establishes connection with the opposite terminal by using the public network address information;
and carrying out information interaction between the private network user and an opposite terminal in the network for protecting the service quality of the service based on the connection.
The step C comprises the following steps:
an application or service boundary control function entity initiates a service request message to PDF/BCF by a private address of a private network user;
the PDF/BCF determines a public network address corresponding to a private network user according to the corresponding relation between the stored private address and the distributed public network address, and establishes connection with an opposite terminal by using the public network address information;
and carrying out information interaction between the private network user and an opposite terminal in the network for protecting the service quality of the service based on the connection.
It can be seen from the above technical solutions that the present invention solves the problem of QoS resource allocation between a user having a private network address and an external network in a network using an independent bearer control layer entity, thereby conveniently implementing interworking between networks and expanding the capability of the network to adapt to services.
That is to say, the implementation of the present invention enables the corresponding bearing control layer entity and application layer entity in the network with the independent bearing control layer to obtain the corresponding relationship between the private network address and the public network address, thereby distributing the corresponding public network resource for the private network user.
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FIG. 1 is a schematic diagram of a network architecture for the present invention;
FIG. 2 is a schematic view of the process of the method of the present invention 1;
FIG. 3 is a schematic process diagram 2 of the method of the present invention;
fig. 4 is a schematic diagram of application networking of the method of the present invention.
Detailed Description
In a network with guaranteed service quality, i.e. a network with an independent bearer control layer, QoS signaling is interacted among functional entities such as an AF (application function), a PDF (policy decision function), a BCF (bearer control function), and a TPF (bearer transport function), so as to guarantee service quality of a service.
At present, the media stream addresses of service session transmitted in the signaling connection between functional entities are all regarded as public network addresses by default, and the condition that private network addresses exist is not considered.
The core of the invention is that the bearing control layer entity and the application layer entity acquire the address (port) conversion information in the independent bearing control layer network, so as to realize the correct resource allocation function. That is, the main purpose of the present invention is to enable each functional entity to correctly process the transmission and conversion of private addresses, so as to achieve the purpose of correctly addressing and allocating resources. Therefore, the problems that when a user uses a private network address, end-to-end QoS resource allocation cannot be completed correctly and end-to-end service QoS cannot be guaranteed are solved.
The invention provides a method for realizing corresponding processing of functional entities such as an Application Function (AF), a Policy Decision Function (PDF), a Bearer Control Function (BCF), a bearer transport function (TPF) and the like when a network address (port) conversion (NA (P)) T is needed in a network (BCF) with an independent bearer control layer.
In fig. 1, the policy decision function PDF and the bearer control function BCF may be in the same physical entity, or in different physical entities (for example, the BCF is connected to the AF through the PDF), or only one logical form exists in a certain network.
For a further understanding of the present invention, the following will describe in further detail a specific implementation of the method of the present invention with reference to fig. 2 and 3.
Usually, a signaling message initiated by a user to an application function AF includes identity information of a calling party and a called party, where the signaling message may be SIP INVITE (session initiation protocol application) message, and the identity information of the calling party and the called party may be a domain name, an address, port information, and the like; the service border control SBC function, the soft switch, the P-CSCF, etc. AF will resolve the address information therein. When the corresponding address (such as the calling address) is a private address, the bearer control function PDF/BCF needs to perform corresponding address translation processing to ensure normal interaction of information between AFs.
The present invention provides two corresponding address translation processes for the case where the calling address is a private address, which will be described separately below.
One implementation method is shown in fig. 2, and specifically includes the following steps:
step 21: AF sends request for applying public network address to NAPT gateway;
step 22: after receiving the request, the NAPT gateway allocates a corresponding public network address for the NAPT gateway and returns the public network address to the AF;
in step 21 and step 22, the AF directly interacts to a gateway NAPT-GW (such as TPF/ER or media gateway in fig. 1) with a network address (port) conversion na (p) T function, instead of through PDF/BCF, and requests and specifies a private network-public network address corresponding relationship corresponding to the session media stream;
step 23: after receiving the public network address information, the AF initiates a QoS resource request to the PDF/BCF, and at the moment, the media stream address to be carried is the well-allocated public network address;
step 24: PDF/BCF directly uses corresponding public network address to carry out end-to-end QoS signaling interaction, and carries out corresponding resource allocation, and PDF/BCF does not need to do any extra operation because the obtained public network address is the public network address;
step 25: and the PDF/BCF returns resource allocation result information to the AF.
As shown in fig. 2, after obtaining the public network address allocated by the NAPT gateway, the AF may forward the INVITE message of the user to the peer AF based on the public network address, and return a response message from the peer AF to the home AF, and carry the negotiation parameter.
Only the address translation process of the calling side is described in fig. 2, and the address translation process for the called side, which is also located in the private network, is similar to that of the calling side and thus will not be described in detail.
In fig. 2, the process of allocating public network addresses by the NAPT gateway NAPT-GW may adopt two specific implementation manners as required:
(1) after determining the corresponding relation between the private network and the public network address in the NAPT gateway, returning, and directly using the AF according to the corresponding relation;
(2) the AF applies for the number of public network addresses only in the message, NAPT gateway returns the public network addresses with corresponding number to AF, and AF determines the corresponding relation between private network and public network addresses, and transmits the corresponding relation to NAPT gateway for media stream transmission when needed.
Another address translation processing procedure is shown in fig. 3, and specifically includes the following steps:
step 31: AF sends request message of applying public network address to PDF/BCF;
step 32: after receiving the request message for applying public network address, PDF/BCF sends the request message for applying public network address to NATP gateway;
step 33: after receiving the request message for applying the public network address, the NAPT gateway allocates a corresponding public network address for the NAPT gateway and returns the public network address to the PDF/BCF;
step 34: the PDF/BCF returns the obtained public network address to the AF;
in steps 31 to 34, the AF is an interactive request to a gateway NAPT-GW with a network address (port) conversion na (p) T function through PDF/BCF, and specifies a private network-public network address corresponding relationship corresponding to a session media stream;
a subsequent processing procedure, which is the same as the processing procedure in fig. 2, namely, a QoS resource request is initiated to the PDF/BCF, the carried media stream address is an allocated public network address, and when the PDF/BCF interacts only with a private network, the address information transmitted by the AF through the QoS resource request message may also be a private network address, and then, the PDF/BCF determines the public network address information corresponding to the private network address according to the private network address, and directly performs end-to-end QoS signaling interaction by using the public network address, determines a resource allocation result, and simultaneously, needs to return the resource allocation result to the AF; whether a request QoS resource message sent by the AF carries a public network address is determined by the AF according to the requirement;
in fig. 3, the PDF/BCF does not need to perform any additional processing other than the need to transfer the address correspondence between the AF and the NAPT-GW.
Also, in fig. 3, only the processing procedure of the calling side is described, and the processing procedure of the called side is similar thereto and will not be described in detail.
In fig. 3, there are two ways to determine the corresponding relationship between the private network and the public network: one is determined by the NAPT gateway, and the other is determined by the AF gateway, which is not described herein again;
for the implementation method provided in fig. 3, it should be noted that: in the process of determining the address corresponding relationship, the transmitted address corresponding relationship is required to pass through the PDF/BCF connected to the NAPT-GW and can be acquired by the PDF/BCF, so the address corresponding relationship can also be stored in the PDF/BCF, and when the message sent by the AF carries a private network address, the corresponding public network address is determined on the PDF/BCF, and corresponding processing is performed based on the public network address.
In the invention, because a certain PDF/BCF in the network may need to use a private network address to interact with a device in a private network, may also need to issue policy information such as flow mapping to a certain edge or relay/boundary device, or may also need to transmit the corresponding relation of the private network-public network address to other PDFs/BCFs, some PDFs/BCFs need public network addresses, and some PDFs/BCFs need private network addresses, therefore, the corresponding relation of the private network-public network addresses needs to be recorded on the PDFs/BCFs. According to the said private network-public network address corresponding relation, various treatments can be carried out, such as adopting public network address to interact with public network equipment, adopting private network address to interact with equipment in private network, etc.
In the specific application process of the invention, the calling side and the called side can simultaneously use one of the two NA (P) T processing methods, or respectively adopt different processing methods, and the specific adopted method of the calling side and the called side is determined according to the networking mode and the requirements of operators.
In fig. 4, a networking architecture application of the present invention is shown, as shown in fig. 4, where PDF and BCF are set in a network as separate physical entities, and PDF and AF at this time can be merged into the same physical entity; the NA (P) T-GW, which is independently arranged or arranged in the BCF, can divide the bearing network into a private network part and a public network part. Recording the corresponding relation between the private network and the public network address determined by the AF in the PDF, and applying for resources from the AF private network address to a bearing control function A-BCF in the private network when the PDF needs to apply for private network resources for the AF; and when the AF needs to apply for the public network resources, the AF public network address applies for the resources to the BCF in the public network.
In summary, the present invention solves the problem how to handle the interactive allocation of QoS resources between the user with private network address and the external network in the network using the independent bearer control layer entity, and can conveniently realize the intercommunication between networks and expand the network service adaptation capability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A system for the intercommunication between private network user and network for ensuring service quality is featured as carrying out address conversion treatment on interactive information between private network and network for ensuring service quality by address conversion gateway then sending it to opposite network, setting network for ensuring service quality to be network with bearing control layer and setting said network for ensuring service quality to be network including bearing control function entity, application function entity, strategy decision function entity and bearing transmission function entity.
2. The system of claim 1, wherein the address translation gateway is located independently or in a network entity of the QoS network.
3. The system according to claim 1 or 2, wherein said private network user is connected to an application or service border control function entity in the QoS network, or a policy decision function entity PDF/bearer control function entity BCF, directly or through an address translation gateway.
4. A method for intercommunication between private network user and network for ensuring service quality is characterized in that: when information interaction is carried out between a private network and a network for ensuring the service quality of the service, the information is sent to an opposite terminal network after address conversion processing is carried out on the information, the network for ensuring the service quality of the service is a network with a bearing control layer, and the network for ensuring the service quality of the service comprises a bearing control function entity, an application function entity, a strategy decision function entity and a bearing transmission function entity.
5. The method of claim 4, wherein when the private network user initiates the request message, the method specifically comprises:
A. a private network user sends service information to a network for ensuring the service quality;
B. after receiving the service request information, an entity in the network for ensuring the service quality applies for acquiring the public network address information of the private network user from the address translation gateway;
C. and establishing connection between the private network user and the opposite terminal in the network for protecting the service quality of the service based on the connection by utilizing the public network address information, and carrying out information interaction between the private network user and the opposite terminal in the network for protecting the service quality.
6. The method of claim 5, wherein step A comprises: the private network user sends the service information containing the calling identity information to the application or service boundary control function entity in the network for ensuring the service quality.
7. The method of claim 5, wherein step B comprises:
the application or service boundary control function entity determines the address information as the private network address according to the identity information carried in the information sent by the private network user;
the application or service boundary control function entity applies for a public network address for the private network user from the address conversion gateway, and the address conversion gateway distributes a corresponding public network address for the private network user and returns the public network address to the application or service boundary control function entity.
8. The method of claim 5, wherein step B comprises:
the application or service boundary control function entity determines the address information as the private network address according to the identity information carried in the information sent by the private network user;
an application or service boundary control functional entity initiates a request message for applying a public network address to a policy decision functional entity PDF/bearer control functional entity BCF;
the PDF/BCF applies for a public network address for the private network user from the address conversion gateway, distributes a corresponding public network address for the private network user by the address conversion gateway, and returns to the PDF/BCF;
and the PDF/BCF continuously returns the public network address to the application or service boundary control function entity for storage, or stores the public network address on the PDF/BCF.
9. The method of claim 8, wherein said step C further comprises:
and applying for private network resources for the private network users by using the corresponding private network addresses and applying for public network resources for the private network users by using the corresponding public network addresses on the PDF/BCF.
10. The method of claim 7 or 8, wherein said step B further comprises:
the application or service boundary control function entity carries the private network address of the private network user and directly or sends a request for applying a public network address to the address conversion gateway through PDF/BCF;
the address translation gateway distributes corresponding public network addresses for the private network addresses, and returns the corresponding relation information of the private network addresses and the public network addresses to the application or service boundary control function entity;
or,
the application or service boundary control function entity carries the number of the public network addresses required by the application or service boundary control function entity, directly or through PDF/BCF, initiates a request for applying the public network addresses to the address translation gateway, and acquires a group of public network addresses returned by the address translation gateway;
the application or service boundary control function entity needs to establish the corresponding relation between each private network address and the public network address and transmit the corresponding relation to the address translation gateway for media stream transmission when needed.
11. The method of any of claims 5 to 8, wherein said step C comprises:
the application or service boundary control function entity saves the corresponding relation between the private address of the private network user and the distributed public network address, and establishes connection with the opposite terminal by using the public network address information;
and carrying out information interaction between the private network user and an opposite terminal in the network for protecting the service quality of the service based on the connection.
12. The method of any of claims 5 to 8, wherein said step C comprises:
an application or service boundary control function entity initiates a service request message to PDF/BCF by a private address of a private network user;
the PDF/BCF determines a public network address corresponding to a private network user according to the corresponding relation between the stored private address and the distributed public network address, and establishes connection with an opposite terminal by using the public network address information;
and carrying out information interaction between the private network user and an opposite terminal in the network for protecting the service quality of the service based on the connection.
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