WO2012149833A1

WO2012149833A1 - Resource and admission control method and system

Info

Publication number: WO2012149833A1
Application number: PCT/CN2012/071262
Authority: WO
Inventors: 尤建洁
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-03
Filing date: 2012-02-17
Publication date: 2012-11-08
Also published as: CN102769873B; CN102769873A

Abstract

Disclosed is a resource and admission control method, including: when a resource and admission control functions (RACF) entity determines that the network performance has degraded, the RACF formulating a new QoS policy rule and notifying a service control functions (SCF) entity that the resources of a user are modified slightly; or, when the RACF determines the network performance has degraded, the RACF sending to the SCF a network performance degradation notification message carrying user information; the RACF formulating a new QoS policy rule according to the subscription information about the user, availability information about the current network resources and modified QoS demand parameters returned by the SCF. Also provided is a resource and admission control system. According to the technical solution of the present invention, the RACF can re-formulate the QoS policy rule after the MPM has reported the network performance information.

Description

Resource admission control method and system

The present invention relates to a Next Generation Network (NGN) technology in the field of communications, and in particular, to a resource admission control method and system. Background technique

At present, NGN is a hot research topic in the field of communication standards. NGN adopts IP packet technology as the bearer network technology and integrates fixed communication and mobile communication, so that NGN can provide richer multimedia services, for example, emerging services with real-time requirements. , including IP TV, video conferencing, multimedia distance learning, video on demand, etc.; these services require communication networks to provide efficient end-to-end Quality of Service (QoS) support; in addition, due to user requirements for network QoS Increasingly high, providing end-to-end QoS has become one of the core issues of NGN.

The International Telecommunication Union-Telecommunications Standardization Sector (ITU-T) is the telecommunications division of the International Telecommunication Union (ITU), which sets standards for resource admission control. In the draft of the latest resource admission control function (RACF) published by ITU-T, a functional framework of RACF is provided, and FIG. 1 is a schematic diagram of a functional framework of the ITU-T RACF in the prior art. As shown in Figure 1, the RACF consists of two parts: the Policy Decision Functional Entity (PD-FE) and the Transport Resource Control Functional Entity (TRC-FE). Among them, TRC- The FE interacts with the transport function entity through the Rc interface, interacts with the Transport Resource Enforcement Functional Entity (TRE-FE) through the Rn interface, and the PD-FE interacts with the TRC-FE through the Rt interface. Mutually interact with the Customer Premises Network (CPN) through the Rh interface, interact with the Policy Enforcement Functional Entity (PE-FE) through the Rw interface, and control the service entity through the Rs interface and the service layer ( SCF (Service Control Functions) interacts with the Network Attachment Control Functions (NACF) through the Ru interface, and the PD-FE interacts with other NGNs through the Ri interface.

In addition, PD-FE is independent of the transmission technology used and SCF; PD-FE makes resources based on network policy rules, service information provided by SCF, transport layer subscription information provided by NACF, and resource availability decision results provided by TRC-FE. Accept the final decision of control.

TRC-FE is not related to services, but is related to the transmission technology used. TRC-FE is mainly used to collect and maintain transmission network information and resource status information. After receiving the resource request from the PD-FE, the TRC-FE performs resource-based admission control based on QoS, priority requirements, resource availability information, and transmission-related policy rules.

The transport layer in the NGN consists of a Policy Enforcement Functional Entity (PE-FE) and a Transport Resource Enforcement Functional Entity (TRE-FE). The PE-FE performs the policy rule delivered by the PD-FE. The PE-FE is a packet-to-packet gateway. It can be located between the CPN and the access network, between the access network and the core network, or between different carrier networks. Key nodes for QoS control, port address translation control, and Network Address Translator (NAT) traversal. The TRE-FE implements the transmission resource policy rule delivered by the TRC-FE. Its scope and function and the Rn interface need to be further studied. It is not in the scope of the RACF draft version 2 (R2).

In the draft of the RACF, in order to measure logical network failures, a Performance Measurement Performance (MPM) is defined, which collects network performance parameters such as congestion, packet loss, delay, Routing loop, etc. 2 is a schematic diagram of interaction between a RACF and an MPM in the prior art, such as As shown in Figure 2, the MPM reports the network performance parameters to the RACF through Rm according to a certain mechanism. The RACF will perform the next policy rule based on these parameters. When the network performance changes, the MPM will report the network performance parameters to the RACF. However, the RACF has not yet considered the interaction between the RACF and the NACF and the SCF, and the RACF uses the network performance parameters to formulate the technical rules of the policy rules. Summary of the invention

In view of this, the main purpose of the present invention is to provide a resource admission control method and system, and the RACF can re-define the QoS policy rule after the MPM reports the network performance information.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a resource admission control method, including:

When the Resource Admission Control Function Entity (RACF) determines that the network performance is degraded, the RACF formulates a new QoS policy rule and notifies the user of the Service Control Function Entity (SCF) that the resources have been modified;

Or, when the RACF determines that the network performance is degraded, the RACF sends a network performance degradation notification message to the SCF, where the network performance degradation notification message carries the user information; and the RACF according to the user's subscription information, the current network resource availability information, and the modified The QoS requirement parameters formulate new QoS policy rules. Before the notification message can be dropped to the SCF, the method further includes:

The performance measurement management entity (MPM) reports the network performance information to the RACF, and the RACF determines whether the network performance is degraded based on the network performance information.

In the above method, the RACF determines, according to the network performance information, whether the network performance is reduced to:

The RACF determines, according to the network performance information reported by the MPM, whether the resources occupied by the current user are decreased compared with the resources allocated when the user resource request is previously received; The RACF determines whether the network performance is degraded according to whether the resource occupied by the current user is decreased compared with the resource allocated when the user resource request was previously received.

In the above method, when the RACF determines that the network performance is degraded, the RACF formulates a new QoS policy rule, and notifies the SCF user that the resources are modified:

The RACF queries the subscription information of the user and the current network resource availability information, and formulates a new QoS policy rule according to the subscription information of the user and the current network resource availability information;

The RACF sends the new QoS policy rule to the transport function entity, and the transport function entity installs a new QoS policy rule and returns a resource modification response message;

The RACF sends a user resource modification notification message to the SCF.

In the above method, the formulating a new QoS policy rule according to the subscription information of the user and the current network resource availability information is:

According to the subscription information of the queried user, if the same service is allowed to have different QoE levels or the user service is allowed to be downgraded, the RACF adjusts the QoE level or downgrades the user service according to the current network resource availability information. , develop new QoS policy rules.

According to the subscription information of the queried user, if the same service is not allowed to have different QoE levels or the user service is not allowed to be downgraded, the RACF re-allocates resources according to the current network resource availability information, and formulates a new QoS policy. Rule: When there is no available resource that can be provided to the user, the RACF preempts the resources of other lower priority users according to the priority, and provides the preempted resource to the user.

In the above method,

The network performance degradation notification message further carries network performance information and/or current network resource availability information; Before the RACF sends the network performance degradation notification message to the SCF, the method further includes: the RACF querying the current network resource availability information.

In the foregoing method, before the RACF formulates a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF, the method further includes:

The SCF formulates the modified QoS requirement parameter according to the network performance degradation notification message, and sends the modified QoS requirement parameter to the RACF through the resource modification request message.

In the above method, after the RACF formulates a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF, the method further includes:

The RACF sends the new QoS policy rules to the transport function entity;

The transport function entity installs a new QoS policy rule and returns a resource modification response message. The present invention further provides a resource admission control system, including: a RACF, an SCF; wherein, the RACF is configured to determine a new QoS policy rule when the network performance is degraded, and notify the SCF user that the resource is modified.

In the above system,

The system further includes: an MPM, configured to report network performance information to the RACF;

The RACF is further configured to determine, according to the network performance information, whether the network performance is degraded. In the above system, the system further includes a transmission function entity;

The RACF is further configured to send the formulated new QoS policy rule to the transmission function entity; the transmission function entity is configured to install a new QoS policy rule, and return a resource modification response. The invention also provides a resource admission control system. And including: RACF, SCF; wherein, the RACF is configured to send a network performance degradation notification message to the SCF when the network performance is degraded, where the network performance degradation notification message carries user information; SCF, used to return modified QoS requirement parameters;

The RACF is further configured to formulate a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameters returned by the SCF.

In the above system,

The RACF is further configured to determine, according to the network performance information, whether the network performance is degraded. In the above system,

The RACF is further configured to: query a current network resource availability information before sending a network performance degradation notification message to the SCF;

The SCE is further configured to formulate a modified QoS requirement parameter according to the network performance degradation notification message.

In the above system, the system further includes a transmission function entity;

The RACF is further configured to send the formulated new QoS policy rule to the transport function entity; the transport function entity is configured to install a new QoS policy rule, and return a resource modification response message.

The resource admission control method and system provided by the present invention, when the RACF determines that the network performance is degraded, the RACF formulates a new QoS policy rule, and notifies the SCF user of the resource modification; or, when the RACF determines that the network performance is degraded, the RACF sends the network. The performance degradation notification message is sent to the SCF, and the network performance degradation notification message carries the user information; the RACF formulates a new QoS policy rule according to the user subscription information, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF, in the network performance. When the MPM reports the network performance information to the RACF, the RACF can redefine the QoS policy rules to make up for the technical gap in the prior art how the RACF uses the network performance information to formulate the policy rules. In addition, the RACF also considers the re-establishment of the policy rules. The problem of interaction with NACF and SCF can be dynamically adjusted for user service QoS. DRAWINGS

1 is a schematic diagram of a functional framework of an ITU-T RACF in the prior art;

2 is a schematic diagram of interaction between a RACF and an MPM in the prior art;

3 is a schematic flowchart of Embodiment 1 of a method for implementing resource admission control according to the present invention; FIG. 4 is a schematic flowchart of Embodiment 2 of a method for implementing resource admission control according to the present invention; FIG. FIG. 6 is a schematic structural diagram of a resource admission control system implemented by the present invention. detailed description

The basic idea of the present invention is: When the RACF determines that the network performance is degraded, the RACF formulates a new QoS policy rule and notifies the SCF user of the resource modification; or, when the RACF determines that the network performance is degraded, the RACF sends a network performance degradation notification message. To the SCF, the network performance degradation notification message carries user information; the RACF formulates a new QoS policy rule according to the user's subscription information, the current network resource availability information, and the modified QoS requirement parameters returned by the SCF.

The invention will be further described in detail below with reference to the drawings and specific embodiments.

The present invention provides a resource admission control method. FIG. 3 is a schematic flowchart of Embodiment 1 of the method for implementing resource admission control according to the present invention. As shown in FIG. 3, the method includes the following steps:

Step 301: The MPM reports the network performance information to the RACF.

Specifically, the MPM reports the network performance information of the current user service or session to the PD-EF of the RACF according to the uplink mechanism or the static configuration reporting mechanism delivered by the PD-EF of the RACF. The network performance information includes congestion, packet loss, and Delay, etc.

Step 302: The RACF determines whether the network performance is specific according to the network performance information reported by the MPM, and the RACF analyzes whether the current user service conforms to the original QoS policy rule according to the network performance information reported by the MPM, that is, determines the resource occupied by the current user. Whether there is a decrease compared to the resources allocated when the user resource request was previously accepted; The RACF determines whether the network performance is degraded according to the resources allocated by the current user compared with the resources allocated when the user resource request was previously received. When the RACF determines the resources occupied by the current user and the previously accepted user resource request When the allocated resources are decreased, the RACF determines that the network performance has decreased, and step 303 is performed; when the RACF determines that the resources occupied by the current user are not decreased compared with the resources allocated when the user resource request was previously received, the RACF determines the network. Performance is not degraded, ending the current process.

Step 303: When the RACF determines that the network performance is degraded, the RACF formulates a new QoS policy rule, and notifies the SCF user that the resource is modified.

FIG. 4 is a schematic flowchart of Embodiment 2 of the method for implementing resource admission control according to the present invention, which is a specific implementation manner of step 303. As shown in FIG. 4, the method includes the following steps:

Step 401: When the RACF does not have the subscription information of the user, the RACF queries the subscription information of the user and the current network resource availability information.

Specifically, when the PD-FE of the RACF does not have the subscription information of the user, the PD-FE sends an inquiry message to the NACF, and after receiving the inquiry message, the NACF sends the subscription information of the user to the PD-FE. Here, the subscription information of the user is Whether the QoE information of the user service or the user service is allowed to be downgraded, and the QoE information of the user service may be allowed to have different QoE levels for the same service;

The PD-FE of the RACF sends a query message to the TRC-EF. After receiving the query message, the TRC-EF sends the current network resource availability information to the PD-FE. The current network resource availability information refers to the user network. Available resources.

Step 402: The RACF formulates a new QoS policy rule according to the subscribed information of the queried user and the current network resource availability information.

Specifically, in the case that the network performance is degraded, the judgment is performed according to the subscription information of the queried user. If the same service is allowed to have different QoE levels or the user service is allowed to be degraded, the PD-EF of the RACF is determined according to step 501. The current network resources queried are available. Sex information, modify user resources, formulate new QoS policy rules, and modify user resources to adjust the QoE level or downgrade the user service.

If the same service is not allowed to have a different QoE level or the user service does not allow the downgrade process, the PD-EF of the RACF re-allocates the resource according to the current network resource availability information queried in step 401, and formulates a new QoS policy. Here, when the resource is reassigned to the user, if there is no available resource that can be provided to the user, the PD-EF of the RACF preempts the resources of the other lower priority users according to the priority, and provides the preempted resource to the resource. The user, to meet the needs of the user.

Step 403: The RACF sends the formulated new QoS policy rule to the transport function entity. Specifically, the PD-EF of the RACF sends a resource modification request message to the PE-EF of the transport function entity, where the message carries the PD-EF of the RACF. New QoS policy rules.

Step 404: The transport function entity installs a new QoS policy rule, and returns a resource modification response message.

Specifically, the PE-EF of the transport function entity installs a new QoS policy rule sent by the PD-EF, and sends a resource modification response message to the PD-EF, to notify the PD-EF to agree to perform resource modification.

Step 405, the RACF sends a user resource modification notification message to the SCF;

Specifically, in step 402, the PD-FE of the RACF modifies the user resource or reallocates the resource for the user, so the PD-FE of the RACF sends the resource modification response message of the PE-EF of the transmission function entity after receiving the resource modification response message of the PE-EF of the transmission function entity. The user resource modification notification message is sent to the SCF to notify the SCF user of the current resource and the originally requested resource.

Step 406, the RACF replies a response message to the MPM;

Specifically, the RACF PD-EF responds to the MPM to inform the MPM that the network performance information has been received and a new QoS policy rule has been formulated.

FIG. 5 is a schematic flowchart of Embodiment 3 of a method for implementing resource admission control according to the present invention. As shown in FIG. 5, the method includes the following steps: Steps 501 to 502 are the same as steps 301 to 302.

Step 503: When the RACF determines that the network performance is degraded, the RACF queries the current network resource availability information, and sends a network performance degradation notification message to the SCF, where the user information is carried. Specifically, when the RACF determines that the network performance is degraded, the RACF PD- The FE sends a query message to the TRC-EF. After receiving the query message, the TRC-EF sends the current network resource availability information to the PD-FE. The current network resource availability information refers to the available resources that can be provided for the user.

The RACF sends a network performance degradation notification message to the SCF, where the network performance degradation notification message carries user information, which is used to notify the SCF of the performance degradation of the network and the user whose network performance is degraded; wherein the user information refers to the identifier of the user. For example, the user name or the user IP address, etc.; here, the network performance degradation notification message may optionally carry the network performance information and/or the current network resource availability information in addition to the user information.

Step 504, the SCF formulates the modified QoS requirement parameter according to the network performance degradation notification message, and sends the modified QoS requirement parameter to the RACF through the resource modification request message.

Specifically, after the SCF receives the network performance degradation notification message, if the message carries only the user information, the SCF formulates the modified QoS requirement parameter according to the result of the renegotiation with the user or the local configuration, and passes the modified QoS requirement parameter. The resource modification request message is sent to the RACF; if the message carries not only the user information but also the network performance information and/or the current network resource availability information, the RACF determines the network performance information and/or the current network resource availability information. The modified QoS requirement parameters are formulated, the modified QoS requirement parameters formulated by the method, and the modified QoS requirements formulated by the method of formulating the modified QoS requirement parameters by using the SCF according to the result of renegotiating with the user or the local configuration. Compared with the parameters, the modified QoS requirement parameters will be more accurate;

The SCF sends the modified QoS requirement parameters to the RACF ₀ through the resource modification request message. Step 505: After receiving the resource modification request message, the RACF queries the subscription information of the user, and formulates a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter.

Specifically, after receiving the resource modification request message, the RACF determines that the resource needs to be modified. When the PD-FE of the RACF does not have the subscription information of the user, the PD-FE sends a query message to the NACF, and after receiving the query message, the NACF will The subscription information of the user is sent to the PD-FE. Here, the subscription information of the user is the QoE information of the user service or whether the user service is allowed to be degraded. The QoE information of the user service may be different for the same service.

After the subscription information of the user is queried, the RACF formulates a new QoS policy rule according to the subscription information of the user, the current network resource availability information that is queried, and the modified QoS requirement parameters returned by the SCF. Here, the RACF according to the subscription information of the user, the current Network resource availability information and modified QoS requirement parameters The method for formulating new QoS policy rules belongs to the prior art and will not be described here.

Step 506: The RACF sends the formulated new QoS policy rule to the transport function entity. Specifically, the PD-EF of the RACF sends a resource modification request message to the transport function entity.

PE-EF, this message carries the new QoS policy rules formulated by the PD-EF of the RACF.

Step 507: The transport function entity installs a new QoS policy rule, and returns a resource modification response message.

Step 508, the RACF sends a user resource modification response message to the SCF, and returns a response message to the MPM;

Specifically, in step 507, the PD-FE of the RACF modifies the user resource or reallocates the resource for the user, so the PD-FE of the RACF sends the resource modification response message of the PE-EF of the transmission function entity after receiving the resource modification response message of the PE-EF of the transmission function entity. User resource modification notification message to the SCF to notify the SCF The user's current resources are modified with the originally requested resources;

The RACF's PD-EF reply response message is sent to the MPM to inform the MPM that the network performance information has been received and a new QoS policy rule has been formulated.

In the above embodiment, if the SCF subscribes the resource modification notification to the RACF in advance, the RACF passively sends the user resource modification notification message to the SCF or the RACF to actively send the user resource modification response message to the SCF according to the SCF having subscribed to the resource modification notification; if the SCF does not advance After the resource modification notification is subscribed to the RACF, the RACF may actively send the user resource modification notification message to the SCF or the RACF to actively send the user resource modification response message to the SCF.

In order to achieve the above method, the present invention further provides a resource admission control system. FIG. 6 is a schematic structural diagram of a resource admission control system according to the present invention. As shown in FIG. 6, the system includes: RACF 61 and SCF 62;

RACF 61, used to determine the performance degradation of the network, develop new QoS policy rules, and notify the SCF 62 user's resources to be modified.

The system further includes: an MPM 63, configured to report network performance information to the RACF 61;

The RACF 61 is further configured to determine, according to the network performance information, whether network performance is degraded. The system also includes a transport function entity 64;

The RACF 61 is further configured to send the formulated new QoS policy rule to the transport function entity 64;

The transport function entity 64 is configured to install a new QoS policy rule and return a resource modification response message.

The present invention also provides a resource admission control system, as shown in FIG. 6, the system includes: RACF 61, SCF 62;

The RACF 61 is configured to send a network performance degradation notification message to the SCF 62 when the network performance is degraded, where the network performance degradation notification message carries user information;

SCF 62, used to return the modified Qos requirement parameter; The RACF 61 is further configured to formulate a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameters returned by the SCF 62.

The system further includes: an MPM 63, configured to report the network performance information to the RACF 61; the RACF 61 is further configured to query the current network resource availability information before sending the network performance degradation notification message to the SCF 62.

The SCF 62 is further configured to formulate a modified QoS requirement parameter according to the network performance degradation notification message.

The system also includes a transport function entity 64;

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

Claim

A resource admission control method, characterized in that the method comprises:

Or, when the RACF determines that the network performance is degraded, the RACF sends a network performance degradation notification message to the SCF, where the network performance degradation notification message carries the user information; and the RACF according to the user's subscription information, the current network resource availability information, and the modified The QoS requirement parameters formulate new QoS policy rules.

The method according to claim 1, wherein before the RACF formulates a new QoS policy rule or the RACF sends a network performance degradation notification message to the SCF, the method further includes:

The method according to claim 2, wherein the RACF determines whether the network performance is degraded according to the network performance information:

The RACF determines, according to the network performance information reported by the MPM, whether the resources occupied by the current user are decreased compared with the resources allocated when the user resource request is previously received;

The RACF determines whether the network performance is degraded according to whether the resource occupied by the current user is lower than the resource allocated when the user resource request was previously received.

The method according to claim 1 or 2, wherein, when the RACF determines that the network performance is degraded, the RACF formulates a new QoS policy rule, and notifies the SCF user that the resources are modified:

The RACF queries the subscription information of the user and the current network resource availability information, and formulates a new QoS policy rule according to the subscription information of the user and the current network resource availability information; The RACF sends the formulated new QoS policy rule to the transport function entity, and the transport function entity installs a new QoS policy rule and returns a resource modification response message;

The RACF sends a user resource modification notification message to the SCF.

The method according to claim 4, wherein the formulating a new QoS policy rule according to the subscription information of the user and the current network resource availability information is:

7. The method of claim 1 wherein:

The network performance degradation notification message also carries network performance information and/or current network resource availability information;

Before the RACF sends the network performance degradation notification message to the SCF, the method further includes: the RACF querying the current network resource availability information.

8. The method according to claim 1, wherein the method further comprises: before the RACF formulates a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF, Includes:

The SCF formulates the modified QoS requirement parameters according to the network performance degradation notification message, and the modified The QoS requirement parameters are sent to the RACF through a resource modification request message.

9. The method according to claim 1, wherein the RACF further determines a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF. Includes:

The RACF sends the new QoS policy rules to the transport function entity;

The transport function entity installs a new QoS policy rule and returns a resource modification response message.

10. A resource admission control system, the system comprising: RACF, SCF; wherein

RACF, used to determine the performance degradation of the network, develop new QoS policy rules, and notify the SCF user that the resources have been modified.

11. The system of claim 10, wherein:

The RACF is further configured to determine, according to the network performance information, whether the network performance is degraded.

12. The system of claim 10, wherein the system further comprises a transmission function entity;

The RACF is further configured to send the formulated new QoS policy rule to the transport function entity; the transport function entity is configured to install a new QoS policy rule, and return a resource modification response

13. A resource admission control system, the system comprising: RACF, SCF; wherein

The RACF is configured to send a network performance degradation notification message to the SCF when the network performance is degraded, where the network performance degradation notification message carries user information;

SCF, used to return modified QoS requirement parameters;

The RACF is further configured to formulate a new QoS policy rule according to the subscription information of the user, the current network resource availability information, and the modified QoS requirement parameter returned by the SCF.

14. The system of claim 13 wherein:

15. The system of claim 13 wherein:

16. The system of claim 13 wherein the system further comprises a transmission function entity;