WO2009023999A1

WO2009023999A1 - A method for establishing inter-domain end-to-end path

Info

Publication number: WO2009023999A1
Application number: PCT/CN2007/003673
Authority: WO
Inventors: Dingjun Li
Original assignee: Zte Corporation
Priority date: 2007-08-21
Filing date: 2007-12-19
Publication date: 2009-02-26
Also published as: CN101102254A

Abstract

A method for establishing inter-domain end-to-end path is provided. In this method, a first interface is set between Policy Decision Function Entity (PD-FE) of the local domain and PD-FE of the opposite domain, and a second interface is set between Transport Resource Control Function Entity (TRC-FE) of the local domain and TRC-FE of the opposite domain. The information about traffic is passed via the first interface and the information about transmission network is passed via the second interface. By this method, the problem that traffic control function and PD-FE can't independently complete establishing the inter-domain end-to-end path, which is closely correlative to bear network, can be solved.

Description

FIELD OF THE INVENTION The present invention relates to the field of next generation network communications, and in particular, to a cross-i or end-to-end path establishment method in a next generation network. BACKGROUND Currently, how to implement end-to-end network resource allocation and control mechanism is one of the important issues of network resource admission control in the next generation network. This issue will become very important as the technology of the NGN network evolves and is gradually deployed. In the current definition of the International Telecommunications Union Next Generation Network (ITU-NGN) resource allocation and control function subsystem (ie, resource admission control equipment, referred to as RACF, whose structure is shown in Figure 1) (mainly Y As defined in the .RACF (Y.2111) standard, the way in which the transport network cross-domain end-to-end path is established is divided into three types. The first type is the service between the service layer service control unit SCF (service control function). The signaling is completed; the second is completed by the signaling of the transport network itself; the third is the cross-domain interface between the Policy Decision Function Units (PD-FE) entities in the resource admission control subsystem of the transport control layer. The Ri interface is completed, and its specific implementation is shown in Figure 2. Fig. 1 shows the structure of an RACF according to the related art. In the structure shown in FIG. 1, the following functional units are included: Transport Resource Enforcement Function Entity (TRE-FE), Policy Enforcement Function Entity (PE-FE), transmission The Resource Control Function Entity (TRC-FE), the Policy Decision Function Entity (PD-FE), and the Resource Admission Control Function (RACF). The functions of the various interfaces between the above functional units are as follows: The Rc interface is responsible for the collection of network topology and resource information of the Transport Functions and the collection of resource usage during the operation of the network;

The Rs interface is responsible for the interaction between the Service Control Layer (SCF) and the Policy Decision Function Unit (PD-FE) of the Transport Network Control Layer (RACF) for service session abstract resource requests; The Rt interface is responsible for the policy decision function unit PD-FE and the transport network resource control function unit.

(TRC-FE) performing related interactions between request and allocation of session network resources;

The Ri interface is responsible for cross-domain communication between PD-FEs;

The Rp interface is responsible for intra-domain communication between TRC-FEs; the specific functions of each functional unit and interface are defined in the ITU-T Y.RACF standard and other related standards, and will not be repeated here (the Rj interface in Figure 1 is The interface set up to implement the session path establishment, which will be described later). In the above three modes based on the structure, except for the second type, which can completely guarantee the establishment of the cross-domain end-to-end path, the other two methods can complete the end-to-end path establishment in some information that needs to be closely related to the transport network technology. In the case (for example, in a network using MPLS-TE technology), the end-to-end path cannot be established because:

PD-FE is a functional unit that focuses on the relevant policy decisions of the transport technology independent. It does not have information related to the carrier network technology and therefore cannot guide the establishment of the path related to the bearer network technology; The SCF also transmits service-related signaling, and does not have the ability to guide the establishment of paths related to the bearer network technology. In the second method, the manner in which the transport network itself establishes the end-to-end path of the domain along with the path signaling has scalability problems, which is not conducive to widespread deployment. Moreover, an effective scheme for establishing a 2-domain end-to-end path has not yet been proposed. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. Therefore, the main object of the present invention is to provide a cross-domain end-to-end path establishment solution, which can solve the problem in the related art due to the need to use information related to the bearer network technology. Complete cross-domain end-to-end path setup issues. According to an embodiment of the present invention, a cross-domain end-to-end path establishment method is provided. In the method, a first interface is set between the local domain policy decision function unit and the peer domain policy decision function unit, and is disposed between the local domain resource control function unit and the peer domain transmission resource control function unit. The second interface. The method includes: Step S502: The local domain policy decision function unit sends a local path establishment request of the session to the local resource transmission control unit, and sends a session request to the peer domain policy decision function unit by using the first interface, where After receiving the path establishment request in the local domain of the session, the domain transmission resource control function unit performs path calculation and resource allocation in the local domain. Step S504: The peer domain policy decision function unit receives the session request, and transmits the resource control function unit to the peer domain. Sending a path establishment request in the peer domain of the session, and the peer domain transmission resource control function unit receives the path establishment request in the peer domain after receiving the path establishment request in the peer domain; Step S506, the local resource transmission control unit And the peer-to-peer domain transmission resource control function unit unidirectionally or mutually informs the path establishment information and the path establishment information in the respective domain through the second interface, and informs the respective information about the path establishment information and the path establishment information. Transmit resource execution work of the domain ingress node Unit; and a step S508, the execution of this domain transfer function unit and the resource transfer function unit for performing resource-terminal domain of their path, respectively establish their respective domain information and information related to the path establishment processing, and allocates resources to establish a connection. In step S502, the local domain policy decision function unit sends a local intra-domain boundary-to-boundary path establishment request of the session to the local resource transmission control function unit. Moreover, in step S504, the peer end domain policy decision function unit sends the peer end domain inner boundary to the boundary path establishment request of the session to the peer end domain transmission resource control function unit. In addition, the first interface is a Ri interface, and the first interface transmits information related to the service; the second interface is an Rj interface, and the second interface transmits information related to the transport network. Moreover, the related information of the path establishment information includes: the egress node information, and the encapsulation information of the sent packet. Further, in the method, the above network is a next generation network. Through the above technical solution of the present invention, the problem that the service control function and the policy decision function unit cannot separately complete the cross-domain end-to-end path establishment closely related to the bearer network technology is solved. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawing: 1 is a block diagram of a RACF according to the related art; FIG. 2 is a schematic diagram of ί-domain end-to-end path establishment by a Ri interface between policy decision function units according to the related art; FIG. 3 is a diagram according to an embodiment of the present invention. Schematic diagram of cross-domain end-to-end path establishment through Ri interface and Rj interface; FIG. 4 is a schematic diagram of a cross-domain end-to-end path establishment method for the RACF structure shown in FIG. 1 according to an embodiment of the present invention; and FIG. It is a flowchart of a cross-domain end-to-end path establishment method in the embodiment of the present invention. DETAILED DESCRIPTION In this embodiment, a cross-domain end-to-end path establishment method is provided, which is a core technology for collecting network topology resources in a next generation network. The method implements cross-domain communication between the transmission resource control function unit (TRC-FE) in the NGN network to implement the cross-domain end-to-end path establishment method related to the bearer network technology, and implements four methods related to the bearer network. The establishment of the cross-domain end-to-end path solves the problem that the cross-domain end-to-end path establishment cannot be completed due to the need to use the information related to the bearer network technology in the related art. Embodiments of the present invention will be described in detail below. As shown in FIG. 3, in the method, an Rie interface (ie, the first interface described above) and an Rj interface (ie, the second interface described above) are used to implement an establishment of a ^5- domain end-to-end path in a next-generation network. The Ri interface and the Rj interface connect multiple networks of the "transport network" and the transit network to implement the connection between two user terminal devices (user terminal devices #1 and #2). Specifically, as shown in FIG. 4, the Ri interface connects the local domain (DOMAIN A) policy decision function unit (PD-FE) to the peer domain (DOMAIN B) policy decision function unit, and the Rj interface The local transmission resource control function unit is connected to the peer domain transmission resource control function unit, wherein the Ri interface transmits information related to the service; the Rj interface transmits information related to the transmission network. As shown in FIG. 5, the method may The method includes: Step S502: The local domain policy decision function unit sends a local path establishment request of a session to the local resource transmission control unit, and uses the Ri interface to determine the peer domain policy. The policy function unit sends a session request, where the local domain transmission resource control function unit performs path calculation and resource allocation in the domain after receiving the path establishment request in the domain of the session; Step S504, the peer end domain policy decision function unit receives the session request, and transmits the path establishment request in the peer end domain of the session to the peer domain transmission resource control function unit, and the peer domain transmission resource control function unit receives the path in the peer end domain of the session. After the request is established, path calculation and resource allocation in the peer domain are performed. Step S506, the local domain resource control function unit and the peer domain resource control function unit notify the path establishment information in their respective domains through the Rj interface. Correlating information related to the path establishment information, and notifying the related information of the path establishment information and the path establishment information to the transmission resource execution function unit of the ingress node of the respective domain; and step S508, the transmission resource execution function unit of the domain and the peer domain The transmission resource execution function unit respectively identifies and processes the path establishment information and the path establishment information related information of the respective domain, establishes a connection and allocates resources. In step S502, the local domain policy decision function unit sends a local-edge-to-edge path establishment request of the session to the local resource transmission control unit. Moreover, in step S504, the peer end domain policy decision function unit sends the peer end domain inner boundary to the boundary path establishment request of the session to the peer end domain transmission resource control function unit. In addition, the Ri interface transmits information related to the service, and the Rj interface transmits information related to the transport network, thereby ensuring the correctness of the service data and ensuring the quality of the transmission. Moreover, the related information of the path establishment information includes: an egress node information, and a packet encapsulation information. In summary, the present invention utilizes the existing Ri interface and the cross-domain communication interface (Rj interface) between the transmission resource control function units to directly transmit the information about the carrier network technology to perform the cross-domain end-to-end path of the bearer network. The problem is that the service control function unit and the policy decision function unit cannot separately complete the cross-domain end-to-end path establishment closely related to the bearer network technology. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

The present invention provides a cross-domain end-to-end path establishment method, and a first interface is set between the local policy decision function unit and the peer domain policy decision function unit, and the resource control function unit and the peer domain are transmitted in the local domain. A second interface is disposed between the transmission resource control function unit, and is characterized by:

Step S502, the local domain policy decision function unit sends a local path establishment request of the session to the local resource transmission control unit, and sends a session request to the peer domain policy decision function unit by using the first interface, where After the local domain transmission resource control function unit receives the path establishment request in the local domain of the session, performing path calculation and resource allocation in the local domain;

Step S504, the peer end domain policy decision function unit receives the session request, and transmits a path establishment request in the peer end domain of the session to the peer end domain transmission resource control function unit, where the peer end domain transmission resource control function unit receives After the path establishment request in the peer end domain of the session, the path calculation and resource allocation in the peer domain are performed;

Step S506, the local area transmission resource control function unit and the peer end field transmission resource control function unit unidirectionally or mutually notify the path establishment information and the path establishment information in the respective domain through the second interface, And notifying the path establishment information and the related information of the path establishment information to a transmission resource execution function unit of an ingress node of a respective domain; and

Step S508, the transmission resource execution function unit of the local domain and the transmission resource execution function unit of the opposite domain respectively process the path establishment information of the respective domain and the related information of the path establishment information, and establish Connect and allocate resources. The cross-domain end-to-end path establishment method according to claim 1, wherein in the step S502, the local domain policy decision function unit sends a copy of the tongue to the local domain resource control function unit. The intra-domain boundary-to-boundary path establishes a cross-domain end-to-end path establishment method according to claim 1, wherein in the step S504, the peer end domain policy decision function unit is directed to the pair The end domain transmission resource control function unit sends a peer-to-peer intra-domain boundary-to-boundary path establishment request of the session.

The cross-domain end-to-end path establishment method according to claim 1, wherein the related information of the path establishment information comprises: egress node information, and data packet encapsulation information.

The cross-domain end-to-end path establishment method according to any one of claims 1 to 4, wherein the first interface is a Ri interface, and the first interface delivers information related to a service.

The cross-domain end-to-end path establishment method according to any one of claims 1 to 4, wherein the second interface is an Rj interface, and the second interface transmits a transmission network-related information.

The cross-domain end-to-end path establishment method according to any one of claims 1 to 4, wherein the network is a next generation network.