WO2009117867A1

WO2009117867A1 - Method for carrying out pull mode resource admitting control under nomadic scene of the next generation networ

Info

Publication number: WO2009117867A1
Application number: PCT/CN2008/070575
Authority: WO
Inventors: 宋军; 尤建洁
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2009-10-01

Abstract

A method for carrying out pull mode resource admitting control under nomadic scene of the next generation network, after a user terminal accesses the next generation network in a visit network, the method includes the following steps: a) the user terminal using transport layer signaling to send a resources request to RCEF of the visit network; b) RCEF transmitting the resources request to RACS of the visit network after receiving the resource request; c) RACS of the visit network making the resources strategy decision and sending the decision result to RCEF to proceed the strategy installation after verifying the authorization of the resources request.

Description

Method for implementing pull mode resource admission control in next generation network nomadic scenario

Technical field

The present invention relates to the field of communications, and in particular, to a method for implementing PULL mode resource admission control in a nomadic scenario of a next generation network.

Background technique

NGN (Network Generation Network) is a hot research topic in the field of communication. It uses packet technology such as IP (Internet Protocol) as a bearer network technology to consolidate fixed communication networks and mobile communication networks, and can Users provide richer multimedia services.

TISPAN (Telecommunication and Internet converged Services and Protocols for Advanced Networking, a service and protocol for advanced network communication and Internet convergence) has established a dedicated research group dedicated to the development of NGN technical standards. TISPAN divides the NGN architecture into a service layer and a transport layer. At the transport layer, NASS (Network Attachment Subsystem) and RACS (Resource and Admission Control Subsystem) are introduced, which is responsible for the upper layer. Provide independent user access management and resource control guarantee functions.

The functional architecture of TISPAN RACS is shown in Figure 1. The RACS associates the resource requirements of the service layer with the resource allocation of the network bearer layer, and performs functions such as policy control, resource reservation, admission control, and NAT (Network Address Translation) traversal. The RACS provides a transport layer control service for applications through a series of QoS (Quality of Service) policies, so that user terminals can obtain the required quality of service guarantee.

The RACS consists of two entities: SPDF (Service-based Policy Decision Function) and A-RACF (Access-Resource and Admission Control Function).

See SPDF

SPDF provides a unified interface to the application layer, shielding the underlying network topology and specific access classes. Type, providing business-based policy control. SPDF selects a local policy according to the request of Application Function (AF), and maps the request to IP QoS parameters, and sends it to A-RACF and BGF (Border Gateway Function) to control the corresponding resources.

• A-RACF

The A-RACF controls the access network and has the functions of admission control and network policy aggregation. The A-RACF receives the request from the SPDF and then implements admission control based on the saved policy, accepting or rejecting the request for the transport resource. The A-RACF obtains the network attachment information and the user QoS list information from the NASS through the e4 reference point (interface), so that the available network resources can be determined according to the network location information (for example, the address of the physical node of the access user), and the resource allocation is processed at the same time. Refer to the user QoS list information when requesting.

The transport layer also contains three functional entities: BGF (Border Gateway Function), RCEF (Resource Control Enforcement Function), and BTF (Basic Transport Function).

> BGF

BGF is a packet-to-packet gateway that can be located between the access network and the core network (implementing the core border gateway function) or between the two core networks (implementing the border border gateway function). The BGF performs NAT traversal, gating, QoS marking, bandwidth limitation, usage measurement, and resource synchronization under the control of SPDF.

> RCEF

The RCEF implements the Layer 2/Layer 3 (L2/L3) media stream policy defined by the access operator through the Re reference point to complete the functions of gating, QoS marking, and bandwidth limitation.

> BTF

BTF includes two basic transport processing functions: Elementary Forwarding Functions (EFF) and Elementary Control Functions (ECF).

RACS supports the QoS resource control modes of "PULL" and "Push (PUSH)" to adapt to different types of UEs (User Equipment). The so-called PUSH mode means that the AF requests the QoS resource authorization and the resource reservation from the RACS for the UE-initiated service. If the request can be satisfied, the RACS actively pushes the decision to the transport entity to obtain the corresponding transmission resource. This approach works for all types of UEs.

The so-called PULL mode means that the AF requests the QoS resource authorization and resource reservation from the RACS for the service initiated by the UE, and the transmitting entity actively requests the RACS when receiving the transport layer QoS signaling message. This method is applicable to UEs with transport layer QoS negotiation capabilities, and can explicitly request QoS resource reservation through transport layer signaling.

TISPAN NASS and RACS deliver messages over the e4 interface. NASS completes the management of users attaching to the access network. The main functions include:

- Dynamic provision of IP addresses for user equipment, as well as other configuration parameters;

- authentication of the access layer to the user;

- Authorizing the user for network access based on the user service profile;

- configuring the access network based on the user service list;

- Manage user location information.

When the UE is nomadic, the NGN can be divided into a Home NGN and a Visited NGN.

Figure 2 is a typical nomadic scenario in which the Service Control Subsystem (AF), which provides services to users, is located in the home network, and user data is stored in the home network.

If the nomadic scene shown in Figure 2 is a Wholesale (wholesale) nomadic scene, visit the network.

BGF (V) is optional; if it is a peer-to-peer nomadic scenario, the BGF (V) of the visited network is mandatory.

In the Wholesale nomadic scenario, one party is the network operator, that is, the network level is opened as an infrastructure to multiple service providers in a wholesale manner, and the party does not provide services; the other party is a service provider, which provides various services. When the user is in the scenario, the user accesses the network using the network operator's network access and enjoys the services provided by the service provider.

In the nomadic scenario of peer-to-peer operators, both parties have their own network access and services. When the user is at In this scenario, the user accesses the network using the visited operator's network access and enjoys the services provided by the home network.

The difference between the wholesale nomadic scene and the peer-to-peer nomadic scene is that in the nomadic scenario of the peer-to-peer operator, the BGF that needs to go through the visited network can access the related services of the home network; that is, in this case, the BGF in the visited network is Required; in the Wholesale nomadic scenario, there is no need to use the BGF to visit the network.

In summary, RACS and NASS are important components of next-generation networks. The RACS provides a resource control service for the application through a series of policies, and associates the resource requirements of the service layer with the resource allocation of the network bearer layer, and mainly performs functions such as policy control, resource reservation, admission control, and NAT penetration. The NASS completes the management of the user's attachment to the access network, and implements IP address allocation, transmission layer authentication, authorization, access network configuration, and location information management. In a mobile or nomadic scenario, NASS is responsible for controlling terminal access. Certification.

The resource admission control in the nomadic scenario is very different from the non-nomadic scenario, and the user data of the home network is partially open and non-open to the visited network. The user data of the home network is not open to the visited network. The visited network cannot obtain user data from the home network. At this time, the user's authentication and other operations can only be performed on the home network. The user data of the home network is partially open to the visited network. The visited network can obtain partial user data from the home network. At this time, the user's authentication and other operations can be performed on the visited network.

At present, there is no method for implementing the PULL mode resource admission control in the nomadic scene of the next generation network at the control level (ie, the level involving RACS and NASS).

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and propose a method for realizing PULL mode resource admission control at a control level (ie, involving RACS and NASS) in a nomadic scenario of a next generation network.

In order to solve the above problem, the present invention provides a method for implementing pull mode resource admission control in a next-generation network nomadic scenario. After the user terminal accesses the network to access the next generation network, the method includes the following steps: A: After receiving the service request initiated by the user terminal, the AF initiates a corresponding resource request to the RACS of the home network;

B: After receiving the resource request, the RACS of the home network interacts with the RACS of the visited network, and performs an authorization check on the resource request respectively;

C: after the authorization check is passed, the user terminal initiates a resource request to the RCEF of the visited network by using the transport layer signaling; the RCEF sends the resource request to the RACS of the visited network;

D: Visit the RACS of the network to make resource policy decisions, and send the decision results to the RCEF for policy installation.

In addition, step B specifically includes the following sub-steps:

B11: After receiving the resource request, the RACS of the home network performs an authorization check on the resource request according to a local policy of the home network.

B12: The RACS of the home network acquires the user subscription information corresponding to the user terminal from the NASS of the home network, and performs authorization check on the resource request according to the user subscription information.

B13: The RACS of the home network sends the resource request to the RACS of the visited network, and the RACS of the visited network performs an authorization check on the resource request according to the local policy of the visited network, records the authorization check result, and notifies the RACS of the home network of the result.

In addition, in step D, the RACS of the visited network performs the resource policy decision according to the resource available information and the QoS information carried in the resource request.

In addition, after step D, the method further includes the following steps: The RACS of the visited network sends a resource policy installation notification message to the RACS of the home network.

In addition, step B13 and step C further include the following steps:

B14: The RACS of the home network sends a resource request response to the AF;

B15: The AF sends a service request response to the user terminal to notify the user terminal that the service request has passed the authorization check.

In addition, in step C, the user terminal initiates a resource request to the RCEF by using the following substeps:

C11: The user terminal uses the transport layer signaling to request resources from the BTF of the visited network; C12: the BTF initiates a resource request to the RCEF;

Step D also includes the following steps:

D1: The RCEF sends a resource request response to the BTF;

D12: The BTF sends a response to the user terminal by using transport layer signaling.

The present invention also provides a method for implementing pull mode resource admission control in a next-generation network nomadic scenario. After the user terminal accesses the network to access the next generation network, the method includes the following steps:

a) the user terminal initiates a resource request to the RCEF of the visited network by using the transport layer signaling; b) after receiving the resource request, the RCEF forwards the resource request to the RACS of the visited network;

c) After performing an authorization check on the resource request, the RACS of the visited network makes a resource policy decision, and sends the decision result to the RCEF for policy installation.

In addition, in step c, after receiving the resource request, the following sub-steps are used to authorize the check:

Cl l ) The RACS of the visited network performs authorization check on the resource request according to the visited network local policy; corresponding user subscription information;

Cl3) The RACS of the visited network performs authorization check on the resource request according to the subscription information of the user;

In step c, the RACS of the visited network performs resource policy decision according to the user subscription information and the visited local policy.

In addition, the visited network local policy includes: a locally saved authorization result of the user, and/or service authorization information configured according to a roaming agreement signed between the visited network and the home network.

In addition, in step a, the user terminal initiates a resource request to the RCEF by using the following sub-steps:

Al 1) the user terminal uses the transport layer signaling to request resources from the BTF of the visited network;

Al2) the BTF initiates a resource request to the RCEF; Step C further includes the following steps:

Dl l) the RCEF sends a resource request response to the BTF;

Dl2) The BTF transmits a response to the user terminal using transport layer signaling.

The method of the present invention can implement PULL mode resource admission control for different open conditions of the visited network for the user data of the home network in the nomadic scenario, and improve the existing NGN system, and use the NGN for the user to visit the network. The business provides protection. BRIEF abstract

1 is a schematic diagram of a RACS function architecture of TISPAN in the prior art;

2 is a schematic diagram of a typical nomadic scene in the prior art;

3 is a flowchart of authorization of resource admission control in a PULL mode in a nomadic scenario according to a first embodiment of the present invention;

4 is a flowchart of a reserved execution of resource admission control in a PULL mode in a nomadic scenario according to a first embodiment of the present invention;

FIG. 5 is a flow chart of a resource admission control method in a PULL mode in a nomadic scenario according to a second embodiment of the present invention. Preferred embodiment of the invention

The method for realizing PULL mode resource admission control in the NGN nomadic scenario proposed by the present invention includes two implementation modes:

(1) The resource request of the UE needs to be pre-authorized by the AF in the home network. In this case, the resource admission control in the PULL mode includes two processes: authorization and reservation execution;

(2) The resource request of the UE does not need to be pre-authorized by the AF in the home network. In this case, the authorization and reservation execution process can be performed together. In this way, the visited network and the home network have signed a roaming agreement. The pre-authorization result has been statically configured on the visited network for a specific service, or has been pre-authorized before, and the visited network has saved the corresponding pre-authorization result; Visit The network can perform an authorization check on the resource request of the UE according to the pre-authorization result stored locally, and does not need to hand over the resource request to RACS (H).

In the following, we will record the NASS of the visited network as NASS (V), the NASS of the home network as NASS (H), the A-RACF of the visited network as A-RACF (V), and the A-RACF of the home network. As A-RACF (H); SPDF for visiting the network is recorded as SPDF (V), SPDF for the home network is recorded as SPDF (H); RACS for visiting the network is recorded as RACS (V), and RACS of the home network is recorded as RACS (H).

The invention will now be described in detail in conjunction with the drawings and embodiments.

First embodiment

FIG. 3 is a flowchart of the authorization of the resource admission control in the PULL mode in the nomadic scenario according to the first embodiment of the present invention. The flowchart performs the authorization process in the PULL mode.

FIG. 4 is a flow chart showing the reservation execution of the resource admission control in the PULL mode in the nomadic scenario according to the first embodiment of the present invention.

This embodiment corresponds to the foregoing (1) implementation manner, that is, the resource admission control is divided into two processes of authorization and reservation execution; the process shown in FIG. 3 is executed first, and the process shown in FIG. 4 is executed; FIG. 3 and FIG. The process represents a complete PULL mode resource admission control process. In addition, in this embodiment, the home network user data (subscriber information of the user) is not open to the visited network, and thus operations such as authentication of the user can only be performed on the home network.

As shown in FIG. 3, the authorization process of the resource admission control method in this embodiment includes the following steps:

301. The UE initiates a service request to the AF. The AF generates a session according to the service request, and the ID (identifier) of the session needs to be included in the subsequent message;

302, the AF sends a resource request message to the RACS (H);

303. After receiving the resource request message, the RACS (H) interacts with the NASS (H) to query the subscription information of the user, and performs an authorization check on the resource request according to the subscription information of the user and the local policy of the home network, and records the authorization check. result; The above steps are performed by A-RACF (H) and SPDF (H) and NASS (H) in RACS (H); the following sub-steps are included:

303a, SPDF (H) first receives a resource request message, and performs an authorization check on the resource request according to a local policy of the home network;

The authorization check includes determining whether the request matches the local policy of the home network: If the match (ie, the authorization check passes), the SPDF (H) sends a user information query message to the A-RACF (H); otherwise, the SPDF (H) ) The resource request is rejected and the method ends.

303b, A-RACF (H) sends the message to NASS (H) after receiving the user information inquiry message; NASS (H) sends the user's user service list (contracting information) in the user information inquiry response message To A-RACF (H);

303c, A-RACF (H) sends the above user information query response message to SPDF (H); SPDF (H) performs authorization check on the resource request according to the user's subscription information;

Specifically, the SPDF (H) checks the resource request according to the user service list (contracting information) included in the message, and determines whether the resource request is legal;

304. After completing the authorization check on the resource request, the RACS (H) sends the resource request message to the RACS (V), and the RACS (V) performs an authorization check on the resource request according to the local policy of the visited network, and records the authorization check. Result

Specifically, the RACS (H) first sends the resource request message to the SPDF (V) in the RACS (V); the above authorization check is completed by the SPDF (V).

305. According to the foregoing authorization check result, the RACS (V) sends a resource request response message accepting or rejecting the resource request to the RACS (H);

306, RACS (H) sends a resource request response message to the AF;

307, the AF sends a service request response message to the UE;

At this point, the authorization process for the resource request ends.

After completing the authorization process of the foregoing resource request, the UE may initiate a reservation execution process of the resource request as shown in FIG. 4, which specifically includes the following steps: 401. The UE directly requests a resource from a BTF of the visited network by using a path-coupled transport layer signaling message. The resource request initiated by the UE triggers the BTF to send a resource request message.

402, the BTF sends a resource request message to the RCEF of the visited network;

403. The RCEF sends a resource request message to the RACS (V);

404. After receiving the resource request message, the RACS (V) learns that the resource request is pre-authorized according to the previously recorded (MG) authorization check result of the user terminal, and therefore performs resource policy decision.

Specifically, the A-RACF (V) in the RACS (V) performs the foregoing resource policy decision according to the resource available information and the QoS information carried in the resource request message; and records the current bandwidth usage of the user (that is, the Bandwidth allocated by resource request/service request).

405. After completing the resource policy decision, the RACS (V) sends a resource request response message including the resource policy decision result to the RCEF; the RCEF performs policy installation according to the resource policy decision result;

406. Optionally, the RACS (V) sends a resource policy installation notification message to the RACS (H) to notify the RACS (H) that the corresponding resource policy installation is performed;

407, the RCEF sends a resource request response message to the BTF;

408, the BTF is triggered to respond to the UE by using transport layer signaling;

At this point, the reservation execution process of the resource request is completed.

In this embodiment, the home network user data is not open to the visited network, so the user's authentication and the like can only be performed on the home network. If the user data of the home network is open to the visited network part, the user's authentication (that is, the authorization check of the resource request according to the user's subscription information) may be performed on the visited network; that is, in step 303, the RACS (H) The SPDF (H) performs an authorization check on the resource request according to the local policy of the visited network, and does not need to send a user information inquiry message to the A-RACF (H), but directly sends the resource request to the RACS (V); by RACS (V) The A-RACF (V) interacts with NASS (H) through NASS (V) to obtain user subscription information and perform user authentication operations.

The user data for the home network is open to the visited network portion, and the specific processing steps for the user's authentication at the visited network can refer to the second embodiment of the present invention. Second embodiment

This embodiment corresponds to the foregoing (2) implementation manner, that is, the visited network and the home network have signed a roaming agreement, and the visited network may perform an authorization check on the resource request of the UE according to the roaming protocol, and the implementation manner does not involve AF, and the authorization And the reservation execution process can be performed together. In addition, in this embodiment, the user data of the home network is open to the visited network part, so the user's authentication can be performed on the visited network.

FIG. 5 is a flow chart of a resource admission control method in a PULL mode in a nomadic scenario according to a second embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:

501. The UE directly requests the BTF of the visited network by using the path-coupled transport layer signaling message. The resource request initiated by the UE triggers the BTF to send a resource request message.

502. The BTF sends a resource request message to the RCEF of the visited network.

503. The RCEF sends a resource request message to the RACS (V);

504, after receiving the resource request message, the RACS (V) performs an authorization check according to the visited local network policy; after the authorization check passes, sends a user information query message to the NASS (V) to query the user's subscription information;

The above-mentioned visited network local policy includes: the locally saved authorization result of the user, and/or the service authorization information configured according to the roaming agreement signed between the visited network and the home network.

505, NASS (V) sends the user subscription information query message to NASS (H), NASS (H) queries the user's subscription information (user service list), and includes the query result in the user subscription information query response message and sends it to NASS. (V);

506, the NASS (V) sends a user information query response message including the user subscription information to the RACS (V), and the RACS (V) performs an authorization check on the resource request according to the user subscription information;

507. After the authorization check is passed, the RACS (V) performs resource policy decision according to the user subscription information and the visited local network policy;

Specifically, the A-RACF (V) in the RACS (V) performs resource policy decision according to the user subscription information and the visited network local policy; and records the bandwidth usage of the user for the current service (that is, allocates the resource request/service request) Bandwidth). Similarly, the above-mentioned visited network local policy includes: a locally saved authorization result of the user, and/or service authorization information configured according to a roaming agreement signed between the visited network and the home network.

508. After completing the resource policy decision, the RACS (V) sends a resource request response message including the resource policy decision result to the RCEF; the RCEF performs policy installation according to the resource policy decision result;

509. The RCEF sends a resource request response message to the BTF.

510, the BTF is triggered, and the UE is replied by the transport layer signaling;

At this point, the authorization and reservation process for the resource request is completed.

INDUSTRIAL APPLICABILITY With the method of the present invention, PULL mode resource admission control can be implemented for different open conditions of the visited network for the user data of the home network in the nomadic scenario, and the existing NGN system is improved, and the user is visited. The network uses NGN's business to provide protection.

Claims

Claim

A method for implementing pull mode resource admission control in a next generation network nomadic scenario, wherein the method comprises the following steps after the user terminal accesses the network to access the next generation network:

A: After receiving the service request initiated by the user terminal, the AF initiates a corresponding resource request to the RACS of the home network;

2. The method of claim 1 wherein:

Step B specifically includes the following sub-steps:

3. The method of claim 1 wherein:

In step D, the RACS of the visited network performs the resource policy decision according to the resource available information and the QoS information carried in the resource request.

4. The method of claim 1 wherein:

Step D further includes the following steps: The RACS of the visited network sends a resource policy installation notification message to the RACS of the home network.

5. The method of claim 2, wherein Step B13 and step C further include the following steps:

B14: The RACS of the home network sends a resource request response to the AF;

6. The method of claim 1 wherein:

In step C, the user terminal initiates a resource request to the RCEF by using the following substeps:

C11: The user terminal uses the transport layer signaling to request resources from the BTF of the visited network;

C12: the BTF initiates a resource request to the RCEF;

Step D also includes the following steps:

D11: The RCEF sends a resource request response to the BTF;

A method for implementing pull mode resource admission control in a next-generation network nomadic scenario, wherein after the user terminal accesses the network to access the next generation network, the method includes the following steps: a) the user terminal uses the transport layer The signaling initiates a resource request to the RCEF of the visited network; b) after receiving the resource request, the RCEF forwards the resource request to the RACS of the visited network;

8. The method of claim 7 wherein:

In step c, after receiving the resource request, the following sub-steps are used to perform an authorization check: cl l) The RACS of the visited network performs an authorization check on the resource request according to the visited network local policy; corresponding user subscription information;

In step c, the RACS of the visited network is based on the user subscription information and the visited network The local strategy makes resource policy decisions.

9. The method of claim 8 wherein:

The visited network local policy includes: a locally saved authorization result of the user, and/or service authorization information configured according to a roaming agreement signed between the visited network and the home network.

10. The method of claim 7 wherein:

In step a, the user terminal initiates a resource request to the RCEF by using the following sub-steps: al 1) the user terminal requests the resource from the BTF of the visited network by using the transport layer signaling;

Al2) the BTF initiates a resource request to the RCEF;

Step c also includes the following steps:

Dl l) the RCEF sends a resource request response to the BTF;