WO2009114976A1

WO2009114976A1 - Method and system for resource and admission control

Info

Publication number: WO2009114976A1
Application number: PCT/CN2008/072847
Authority: WO
Inventors: 尤建洁; 宋军
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-03-19
Filing date: 2008-10-27
Publication date: 2009-09-24
Also published as: CN101247652A

Abstract

The present invention discloses a method and a system for resource and admission control, and said method includes: step 1, home service-based policy decision function (H-SPDF) module deciding the resource policy according to the received service request message and the user subscription information, and sending a resource request message to the visited service-based policy decision function (V-SPDF) module; step 2, H-SPDF module receiving a resource request response message sent by V-SPDF after the V-SPDF makes authorization inspection to said resource request message, said resource request response message including the QoS information modified by V-SPDF or the acceptable QoS information fed back by V-SPDF when V-SPDF refuses said resource request message; step 3, H-SPDF module making the final policy decision according to said resource request response message. The application solves the problem of QoS policy decision of span domains.

Description

Resource admission control method and system

TECHNICAL FIELD The present invention relates to the field of communications, and more particularly to a resource admission control method and system in an optimized roaming scenario. BACKGROUND OF THE INVENTION The next network (Network Generation Network, NGN for short) is a hot research topic in the field of communication standards. The packet technology such as IP is used as the bearer network technology to integrate fixed communication and mobile communication. NGN can provide rich multimedia services: for example, Voice over IP (VOIP), video conferencing, multimedia distance learning, video on demand, these services require communication networks to provide efficient end-to-end quality of service (Quality of Service) , referred to as QoS) support. In addition, users are increasingly demanding the quality of network services. Therefore, providing efficient end-to-end QoS is one of the core issues of NGN. The Telecommunication and Internet converged Services and Protocols for Advanced Networking (TISPAN) has established a dedicated research group dedicated to the development of NGN technical standards. TISPAN divides the NGN architecture into a service house and a transport layer. At the transport layer, a Network Attachment Subsystem (NASS) and a Resource and Admission Control Subsystem (RACS) are introduced. NASS is responsible for Provide independent user access management for the upper layer of the service layer. The RACS is responsible for solving the QoS problem of the NGN carrier network. FIG. 1 is a schematic diagram of a RACS function architecture of TISPAN in the prior art, and the RACS associates resource requirements of a service layer with resource allocation of a transport layer. RACS is mainly used to implement functions such as policy control, resource reservation, admission control, and network address translation traversal (NAT). The RACS provides the transport layer control service for the service layer through a series of QoS policies, so that the user equipment (User Equipment, UE for short) can obtain the required monthly quality assurance. RACS consists of two entities: a business-based policy decision function (Service-based Policy)

The Decision Function (SPDF for short) and the Access-Resource and Admission Control Function (A-RACF for short) are described in detail below.

1 P22593 (1) SPDF

SPDF provides a unified interface to the service layer, shields the underlying network topology and specific access types, and provides service-based policy control. SPDF selects the 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 Border Gateway Function (BGF) to control The corresponding resources.

(ii) A-RACF

The A-RACF controls the access network and has the functions of admission control and network policy aggregation. The request is received from the SPDF, and then the admission control is implemented based on the saved policy, accepting or rejecting the request for the transmission resource. A-RACF obtains network attachment information and user QoS list information from the network attachment subsystem through the e4 reference point, so that available network resources can be determined according to network location information (for example, the address of the physical node of the access user), while processing resources Refer to the user QoS list information when assigning a request. The transport layer contains two functional entities: BGF and Resource Control Enforcement Function (RCEF). The two functional entities are described in detail below.

(a) BGF

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

(ii) RCEF

The RCEF implements a Layer 2/Layer 3 (L2/L3) media stream policy transmitted by the A-RACF through the Re reference point to implement gating, QoS marking, bandwidth limitation, and the like. In a roaming scenario, the NGN can be divided into a home network (Home network) and visited network (Visited network) ₀ RACS FIG. 2 is a view of a prior art roaming scenario, located in the home network, the home service-based policy decision function SPDF (H ) Based on the business-based policy decision function SPDF ( V ) located in the visited network, the information is exchanged via the interface, and the AF and SPDF (H) interact through the Gq interface. The UE accesses the network at the visited place and requests to use the AF provided by the home location.

2 P22593 At present, the problem of coordinating and coordinating the formulation of QoS policies between the SPDF (H) of the home network and the SPDF (V) of the visited network in the roaming scenario has not been solved.

RACS is an important part of the next generation network. It provides a resource control service for the application through a series of strategies, and associates the resource requirements of the service layer with the resource allocation of the transport layer, and mainly performs functions such as policy control, resource reservation, admission control, and NAT traversal. FIG. 3 is a flow chart of resource admission control of a roaming scenario in the prior art, including the following steps 301-312:

301. The UE initiates a service request, and sends a request message to the AF, where it is used to trigger the AF generation resource initial 4 request. 302, the AF sends a service request message to the SPDF (H), and the SPDF (H) performs a 4 MANN check on the request. Including whether the resource request in the verification service request message is consistent with the local operator policy rule;

303, SPDF (H) interacts with the NASS through A-RACF (H) to query the user's subscription information; 304, SPDF (H) makes resource policy decisions for the service request message according to the user's subscription information, local operator policy rules, and the like. ;

305, SPDF (H) sends a resource request message to SPDF (V), where the resource request message carries QoS information formulated by SPDF (H);

306. The SPDF (V) performs an authorization check on the received resource request message, including determining whether the resource request message is consistent with the local operator policy rule. If the message is consistent, accepting the request, or rejecting the request;

307, SPDF (V) sends a resource request message to A-RACF (V). In response to the resource request message, A-RACF (V) performs 4 MANN and admission control based on the access network policy, and the request is mapped to the internal network. Topology; 308, A-RACF (V) requests RCEF installation transmission strategy;

309, A-RACF (V) sends a resource request response message to SPDF (V);

310, SPDF (V) sends a resource request response message to SPDF (H);

3 P22593 311, SPDF (H) sends a service request response message to the AF;

312. The AF sends a service request response message to the UE. In the prior art 306 step, SPDF (V) passively processes the resource request message from SPDF (H), ie SPDF (V) -^: does not tamper with the QoS information in the received resource request message, either accept, or Reject, lack of negotiation mechanism with SPDF ( H ), thus reducing the success rate of resource requests. SUMMARY OF THE INVENTION The present invention proposes a resource admission control method and system for solving the above problem in view of the problem of a reduction in the success rate of resource requests caused by the lack of a negotiation mechanism between the above SPDF (V) and SPDF (H). According to an aspect of the present invention, a resource admission control method is provided, including the following steps: Step 1: The home service-based policy decision function module performs resource policy decision according to the received service request message and the subscription information of the user. Sending a resource request message to the service-based policy decision function module of the visited location; Step 2: The home service-based policy decision function module receives the resource request response sent by the visited service-based policy decision function module after performing the authorization check on the resource request message a message, where the resource request response message includes the service quality information modified by the service-based policy decision function module or the acceptable service quality information that is feedback at the time of rejection; Step 3: The attribution-based service-based policy decision function module according to the resource request The response message makes the final decision. Preferably, in step 1, the service-based policy decision function module performs authorization check on the service request message, including verifying whether the resource request in the service request message is consistent with the local operator policy rule. Preferably, in step 1, the home service-based policy decision function module interacts with the network attachment subsystem through the home access resource admission control function module to query the subscription information of the user. Preferably, in step 1, the resource request message sent by the service-based policy decision function module to the service-based policy decision function module includes the home-based service-based message.

4 P22593 The quality of service information developed by the policy decision function module. Preferably, in step 2, the visited resource-based policy decision function module performs an authorization check on the resource request message, including: verifying whether the resource request request is consistent with the local operator policy rule, and if the verification result is consistent, The visited service-based policy decision function module accepts the request; otherwise, the visited service-based policy decision function module modifies the service quality information or rejects the resource request in the resource request message based on the local operator policy rule, and the modified or acceptable The quality of service information is fed back to the home business-based policy decision function module. Preferably, the acceptable quality of service information fed back in the second step in step 2 includes at least one of the following: available bandwidth, media type, reservation priority, QoS level, transmission level, flow status, and the like. Preferably, in step 3, the home service-based policy decision function module makes a final decision according to the QoS information modified by the visited service-based policy decision function module, the user's subscription information, and the local operator policy rule. It is sent to the business-based policy decision function module of the visited place. Preferably, in step 3, the attribution-based service-based policy decision function module rejects the service request according to the QoS information modified by the visited service-based policy decision function module, the subscription information of the user, and the local operator policy rule. According to still another aspect of the present invention, a resource admission control system is provided, including: an information collection module, an initial policy decision module, a policy feedback module, and a final policy decision module, where: the information collection module is configured to receive a service request message. And obtaining the subscription information of the user; the initial policy decision module is configured to perform an initial policy decision according to the service request message sent by the information collection module and obtaining the subscription information of the user; the policy feedback module is configured to use the initial policy decision delivered by the initial policy decision module, Performing an authorization check and sending a resource request response message to the final policy decision module; the final policy decision module makes a final decision based on the resource request response message sent by the policy feedback module. The invention proposes that the service-based policy decision function of the attribution in the roaming scenario and the visited service-based policy decision function pass the interaction information to solve the cross-domain QoS policy decision problem.

5 P22593 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a RACS functional architecture of a TISPAN in the prior art; FIG. 2 is a structural diagram of a RACS roaming scenario in the prior art; FIG. 3 is a flowchart of resource admission control of a roaming scenario in the prior art; 4 is a flowchart of a resource admission control method according to an embodiment of the method of the present invention; FIG. 5 is a specific flowchart of a resource request in a roaming scenario according to an embodiment of the method of the present invention; FIG. 7 is a specific flowchart of a home refusal resource request in a roaming scenario according to an embodiment of the method of the present invention; FIG. 8 is a resource admission control system according to an embodiment of the apparatus of the present invention; block diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the technical solution of the embodiment of the present invention, the negotiation process of the service-based policy decision function and the attribution-based service-based policy decision function for the QoS policy is: the visited service-based policy decision function. The QoS information from the home-based service-based policy decision function can be modified according to its own local policy, and the modified result is fed back to the home-based service-based policy decision function, and the attribution-based service-based policy decision function is based on its own The final policy decision of information such as local policy, that is, reject or receive the modified result. The embodiment of the present invention solves the cross-domain QoS policy decision problem by interacting with the service-based policy decision function of the home location in the roaming scenario and the visited service-based policy decision function. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other if they do not conflict. Method Embodiment In this embodiment, a resource admission control method is provided, and FIG. 4 is a resource of the embodiment.

6 P22593 A flow chart of the admission control method, as shown in FIG. 4, includes steps S402 - S406, step S402, the home SPDF module performs resource policy decision according to the received service request message and the user's subscription information, and goes to the visited SPDF module. Send a resource request message. The resource request message carries the service quality information formulated by the home SPDF module. After the service request message is received by the home SPDF module, the authorization check of the service request message includes: verifying whether the resource request in the service request message is consistent with the local operator policy rule. And the subscription information of the user is obtained by using the home SPDF module to interact and query with the network attachment subsystem through the home access resource admission control function module. Step S404, the home SPDF module receives the resource request response message sent by the visited SPDF module after performing the authorization check on the resource request message, where the resource request response message includes the service quality information modified by the visited SPDF module or the acceptable feedback at the time of rejection. Quality of service information. The acceptable quality of service information that is feedback at the time of rejection may include: available bandwidth, media type, reservation priority, QoS level, transmission level, flow status, and the like. The authorization check performed by the SPDF module of the visited location on the resource request message is: verifying whether the resource request message is consistent with the local operator policy rule. In the case where the verification result is consistent, the visited SPDF module accepts the resource request and feeds back the resource request response message to the home SPDF module. If the verification result is inconsistent, the visited SPDF module may perform the following operations: 1. Modify the service quality information in the resource request message according to the local operator policy rule, and carry the modified service quality information in the resource request response message. Feedback to the home SPDF module; or second, rejecting the resource request and carrying the acceptable quality of service information in the resource request response message and feeding back to the home SPDF module. Step S406: After receiving the resource request response message, the home SPDF module obtains parameter information such as QoS information, user subscription information, and local operator policy rules, and performs the following.

7 P22593 Operation: 1. Accept the parameter information such as QoS information, user subscription information, and local operator policy rules in the resource request response message, and then make the final decision and send the decision to the visited SPDF module; or second, do not accept The resource request, such as the QoS information in the resource request response message, the subscription information of the user, and the local operator policy rule, rejects the resource request. Through the information interaction between the attribution site SPDF and the visited site SPDF, the cross-domain QoS policy decision problem is solved, and the success rate of the resource request is increased. A more detailed description will be given below with reference to FIGS. 5, 6, and 7. FIG. 5 is a flow chart of a resource request in a roaming scenario according to the present invention. The flowchart implements a negotiation process between SPDF (H) and SPDF (V) by interacting with information of SPDF (H) and SPDF (V), and adds resources. The success rate of the request, the flow chart includes the following steps 501-515:

501. The UE initiates a service request, and sends a request message to the AF, where the UE generates the resource for triggering the AF.

502. The AF sends a service request message to the SPDF (H), and the SPDF (H) performs an authorization check on the service request request, including verifying whether the resource request in the service request message is consistent with the local operator policy rule.

503, SPDF (H) interacts with NASS through A-RACF (H) to query the user's subscription information;

504. The SPDF (H) performs resource policy decision on the service request message according to the subscription information of the user, the local operator policy rule, and the like;

505. The SPDF (H) sends a resource request message to the SPDF (V), where the message carries the QoS information defined by the SPDF (H); the foregoing steps 501-505 correspond to step S402.

506. Corresponding to step S404, the SPDF (V) performs a 4 MANN check on the received resource request request, including verifying whether the resource request request is consistent with the local operator policy rule, and if consistent, the SPDF (V) accepts the request; Conversely, SPDF (V) can be based on local operator policy rules.

8 P22593 Change the QoS information in the resource request message and feed back to SPDF (H);

507, SPDF (V) sends a resource request response message to SPDF (H), where the resource request response message carries QoS information modified by SPDF (V);

508. Corresponding to step S406, the SPDF (H) performs the final resource policy decision according to the QoS modification result of the SPDF (V) feedback, the subscription information of the user, and the local operator policy rule.

509, SPDF (H) sends a resource request message to SPDF (V), where the resource request message carries the final QoS information formulated by SPDF (H);

510, SPDF (V) sends a resource request message to A-RACF (V), A-RACF (V) performs 4 MANN and admission control based on the access network policy, and maps the request from SPDF (V) to the internal network Extension

511, A-RACF (V) requests the RCEF installation transmission strategy;

512, A-RACF (V) sends a resource request response message to SPDF (V);

513, SPDF (V) sends a resource request response message to SPDF (H);

514, SPDF (H) sends a service request response message to the AF; 515, the AF sends a service request response message to the UE. 6 is a 3⁄4 _u diagram of a service-based policy decision function rejecting a resource request in a roaming scenario of the present invention, that is, SPDF (V) is a resource request from SPDF (H), and SPDF (V) can satisfy The QoS information is fed back to the SPDF (H) to improve the success rate of the SPDF (H) to initiate the next resource request. The process includes the following steps 601-609: 601, the UE initiates a service request, and sends a request message to the AF for triggering the AF. Generating resources

602. The AF sends a service request message to the SPDF (H), and the SPDF (H) performs a 4manship check on the request, including verifying whether the resource request in the service request message is consistent with the local operator policy rule.

603, SPDF (H) Interact with NASS through A-RACF (H) to query the user's contract

9 P22593 604. The SPDF (H) performs resource policy decision on the service request message according to the subscription information of the user, the local operator policy rule, and the like;

605, SPDF (H) sends a resource request message to SPDF (V), where the resource request message carries QoS information formulated by SPDF (H); and the above steps 601-605 correspond to step S402.

606. Corresponding to step S404, the SPDF (V) performs a 4 MANN check on the received resource request, and the SPDF (V) finds that the request cannot be accepted according to the local operator policy rule.

607. Corresponding to the operation 2 in the case that the visited SPDF verification resource request message is inconsistent with the local operator policy rule, the SPDF (V) sends a resource request response message to the SPDF (H) rejecting the request, where the resource request response message is carried. SPDF (V) acceptable QoS information;

608, SPDF (H) sends a service request response message to the AF;

609. The AF sends a service request response message to the UE. 7 is a flowchart of a service-based policy decision function rejecting a resource request in a roaming scenario according to an embodiment of the present invention, that is, SPDF (V) modifies QoS information from SPDF (H) according to a local policy, and will modify the QoS information. The QoS information is fed back to SPDF (H), while SPDF (H) does not accept the modification of SPDF (V). The process includes the following steps 701-710:

701. The UE initiates a service request, and sends a request message to the AF, where the UE generates the resource for triggering the AF.

702. The AF sends a service request message to the SPDF (H), and the SPDF (H) performs an authorization check on the service request, including verifying whether the resource request in the service request message is consistent with the local operator policy rule.

703, SPDF (H) interacts with NASS through A-RACF (H) to query the user's subscription information;

704. The SPDF (H) performs resource policy decision on the service request message according to the subscription information of the user, the local operator policy rule, and the like;

705. SPDF (H) sends a resource request message to SPDF (V), where the message carries QoS information formulated by SPDF (H);

10 P22593 The above steps 701-705 correspond to step S402.

706. Corresponding to step S404, the SPDF (V) performs a 4 MANN check on the received resource request request, including verifying whether the request is consistent with the local operator policy rule. If consistent, SPDF(V) accepts the request; otherwise, SPDF (V) can modify the QoS information in the resource request message based on the local operator policy rule;

707. The SPDF (V) sends a resource request response message to the SPDF (H), where the resource request response message carries the QoS information modified by the SPDF (V);

708. Corresponding to operation 2 in step S406, SPDF (H) performs final resource policy decision according to QoS modification result of SPDF (V) feedback, user subscription information, and local operator policy rule, SPDF (H) does not Accept the tampering result of SPDF (V) and reject the business request;

709, SPDF (H) sends a service request response message to the AF;

710. The AF sends a service request response message to the UE. The embodiment of the present invention proposes to implement the cross-domain QoS policy decision problem by using the interaction information between the service-based policy decision function and the visited service-based policy decision function in the roaming scenario. Apparatus Embodiment In this embodiment, a resource admission control system is provided for implementing the above method, and Fig. 8 is a block diagram of the present embodiment, which will be described in detail below with reference to Fig. 8. As shown in FIG. 8, the system includes: an information collection module 80, an initial policy decision module 82, a policy feedback module 84, and a final policy decision module 86. The information collection module 80 is configured to receive a service request message and obtain subscription information of the user. The initial policy decision module 82 is connected to the information collection module 80, and is configured to perform initial policy decision according to the service request message sent by the information collection module 80 and the subscription information obtained by the user. The policy feedback module 84 is connected to the initial policy decision module 82, and is configured to perform an initial policy decision issued by the initial policy decision module 82, perform a power check, and send a resource request response message to the final policy decision module.

11 P22593 The final policy decision module 86 is coupled to the policy feedback module 84 for making a final decision based on the resource request response message sent by the policy feedback module 84. The device is used to implement the method in the foregoing method embodiments, and the specific description is not exhaustive here. The resource admission control system provided in this embodiment can implement information interaction between the home location SPDF and the visited location SPDF, and solve the cross-domain QoS policy decision problem. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention can be variously modified and modified. Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.

12 P22593

Claims

Claim

A resource admission control method, comprising the steps of:

Step 1: The home-based policy-based policy decision function module performs resource policy decision according to the received service request message and the user's subscription information, and sends a resource request message to the visited service-based policy decision function module;

Step 2: The home service-based policy decision function module receives a resource request response message sent by the visited service-based policy decision function module to perform the 4-party check on the resource request message, where the resource is The request response message includes the service quality information modified by the service-based policy decision function module or the acceptable service quality information of the feedback at the time of rejection;

Step 3: The home-based service-based policy decision function module determines a final decision according to the resource request response message.

The resource admission control method according to claim 1, wherein in the step 1, the attribute-based policy decision function module performs an authorization check on the service request message, including:

Verify that the resource request in the service request message is consistent with the local carrier policy rule.

The resource admission control method according to claim 2, wherein in the step 1, the home service-based policy decision function module accesses the resource admission control function module and the network attachment subsystem by attribution Interacting, querying the subscription information of the user.

The resource admission control method according to claim 3, wherein, in the first step, the home service-based policy decision function module sends the information to the visited service-based policy decision function module. The resource request message includes:

The attribution is based on service quality information formulated by the policy decision function module of the service.

The resource admission control method according to claim 4, wherein in the step 2, the visited policy-based function module performs a Manchester right check on the resource request message, including:

13 P22593 3, whether the resource request request is consistent with the local operator policy rule, and if the result of the certificate is consistent, the visited policy-based function function module accepts the request;

The visited service-based policy decision function module modifies the service quality information in the resource request message or rejects the resource request based on a local operator policy rule, and feeds back the modified or acceptable service quality information to the The attribution is based on a business policy decision function module. The resource admission control method according to claim 5, wherein the acceptable quality of service information fed back in the step 2 includes at least one of: available bandwidth, media type, reserved priority , QoS level, transmission level, flow status and other parameters. The resource admission control method according to claim 1 or 6, wherein, in the third step, the attribute-based policy decision function module modifies the QoS according to the visited service-based policy decision function module The information, the user's subscription information, and the local operator policy rules, the final decision is made and sent to the business-based policy decision function module of the visited place. The resource admission control method according to claim 1 or 6, wherein, in the third step, the attribute-based policy decision function module modifies the QoS according to the visited service-based policy decision function module The information, the user's subscription information, and the local carrier policy rules reject the service request. A resource admission control system, comprising: an information collection module, an initial policy decision module, a policy feedback module, and a final policy decision module, wherein:

The information collection module is configured to receive a service request message and obtain subscription information of the user; the initial policy decision module is configured to perform an initial policy decision according to the service request message sent by the information collection module and the subscription information of the obtained user;

The policy feedback module is configured to perform an authorization check according to the initial policy decision delivered by the initial policy decision module, and send a resource request response message to the final policy decision module; the final policy decision module according to the policy feedback The resource request response message sent by the module makes the final decision.

14 P22593