WO2009103192A1

WO2009103192A1 - A resource allocation method and a resource release method

Info

Publication number: WO2009103192A1
Application number: PCT/CN2008/000585
Authority: WO
Inventors: 尤建洁; 宋军
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-02-22
Filing date: 2008-03-25
Publication date: 2009-08-27
Also published as: CN101232503B; CN101232503A

Abstract

A resource allocation method and a resource release method are provided. Wherein the resource allocation method includes the following steps: a Basic Transport Function entity (BTF) transmits a resource allocation request to a Transport Resource Control Function Entity (TRC-FE) through a Transport Resource Enforcement Function Entity (TRE-FE) (S302); in the case of that the present resource can satisfy the QoS requirement of the resource allocation request, the TRC-FE transmits a resource decision request to a Policy Decision Function Entity (PD-FE) (S304); when it can determine the resource allocation request can be admitted according to the information carried by the resource decision request, the PD-FE determines a resource allocation policy, and transmits the resource allocation policy to a Policy Enforcement Function Entity (PE-FE) (S306); and the PE-FE performs the resource allocation policy (S308). The present invention can resolve the problem of resource admission control in a pull mode triggered by the BTF.

Description

Resource allocation method and resource release method

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a resource allocation method and a resource release method. BACKGROUND OF THE INVENTION Next, Network Generation Network (NGN) is a hot research topic in the field of communication standards. It uses packet technology such as IP as a carrier network technology to integrate fixed communication and mobile communication. NGN can provide richer multimedia services, such as emerging services with real-time requirements such as Voice over Internet Protocol (VoIP), video conferencing, multimedia distance learning, video on demand, etc. These services require communication networks to provide efficient end-to-end. Up to the end of the quality of service (QoS) support; at the same time, users have higher and higher requirements for network service quality. Therefore, how to provide end-to-end QoS will be one of the core issues of NGN. The International Telecommunication Union Telecommunication Standardization Group (ITU-T) proposes Resource and Admission Control Functions (RACF) to solve the QoS problem of NGN planting networks. The functional framework of RACF is provided in the latest draft of RACF published by ITU-T in January 2008, as shown in Figure 1. The RACF consists of two parts: Policy Decision Functional Entity (PD-FE) and Transport Resource Control Functional Entity (TRC-FE). PD-FE is oriented to Service Control Functions (SCF) and has nothing to do with link layer technology. The PD-FE makes the final based on the policy rules of the operator network, the service information provided by the SCF, the user subscription information provided by the Network Attachment Control Functions (NACF), and the resource availability information provided by the TRC-FE. Resource and admission control decisions. TRC-FE is geared towards transport and is associated with link layer technology. TRC-FE is responsible for collecting and maintaining the topology and resource status information of the transport network, and determining the resource utilization rate based on topology, connectivity, availability of network and node resources, and access information of the access network transport layer. Admission control is implemented. The transmission function i is implemented by the Policy Enforcement Functional Entity (PE-FE), the Transport Resource Enforcement Functional Entit (TRE-FE), and the Basic Transport Function Entity (Basic Transport) Function, referred to as BTF). The PE-FE is a packet-to-packet gateway. It can be located between the Customer Premises Equipment (CPE) and the access network, between the access network and the core network, or between different carrier networks. It supports dynamic QoS. Key nodes for control, port address translation control, and Network Address Translator (NAT) traversal. The TRE-FE performs the transmission resource policy rule indicated by the TRC-FE.

The PD-FE is a policy decision function entity, which is based on media stream session information (obtained from the SCF through the Rs reference point), the user's transmission resource subscription information (obtained from the NACF through the Ru reference point), and preliminary QoS resource decisions, and then with the TRC The -FE interacts to confirm that there are sufficient QoS resources, and finally makes a final decision and sends the decision to the PE-FE for execution.

The TRC-FE is mainly responsible for resource control. It monitors resources in the network and collects relevant information. When the PD-FE requests resources, it responds according to the specific resource status. PE-FE mainly performs policy control under the guidance of PD-FE (gating, bandwidth, traffic classification and labeling, traffic shaping, Layer 2 and Layer 3 QoS mapping, collection and reporting of resource usage information, etc.).

The current description of the TRE-FE protocol is based on the implementation of the Layer 2 policy under the guidance of the TRC-FE, but the specific functions and scope are not determined.

BTF package ^"Two basic transfer processing functions: Elementary Forwarding Functions (EFF) and Basic Elementary Control Functions (ECF). Resource admission control system supports "pull"PULL)" and "Push (PUSH)" two modes of QoS resource control mode to adapt to different types of user equipment. The so-called push mode means that the application function requests the QoS resource authorization and the resource admission control system for the service initiated by the user equipment. Resource reservation, if the request can be satisfied, the resource admission control system actively pushes the decision to the transmission function to obtain the corresponding transmission resource. The so-called pull mode refers to the user equipment requesting the QoS resource authorization and resource reservation from the resource admission control system, After receiving the transport layer signaling from the user, the transport function actively requests a decision from the resource admission control system. Among them, the pull mode is mainly divided into three processes: Authorization, Reservation, and Commitment. The latter two processes can be combined into one process. The pre-authorization is initiated by the CPE, and the application function triggers the generation of the request; the reservation and execution are initiated by the CPE, and the transmission function triggers the generation of the resource request. The resource admission control system supports both push and pull modes. Figure 2 shows the flow chart of resource admission control in the RACF pull mode in the prior art. 2 is a resource admission control flow in a pull mode triggered by a PE-FE. As shown in Figure 2, the process includes the following steps:

S202: The CPE directly requests the resource from the PE-FE by using the path-coupled transport layer signaling, and the transport layer signaling from the CPE triggers the PE-FE to send a resource request message. S204. The PE-FE sends a resource decision request message to the PD-FE.

S206, (Select Execution) If the previous SCF pre-authorizes the request, the PD-FE needs to send a resource operation request message to the SCF to obtain corresponding service information.

S208: The PD-FE checks whether the flow description, the requested QoS resource, and the service information are consistent with the network policy rule and the transmission subscription information. S210. The PD-FE checks the availability of the requested QoS resource.

S212, the PD-FE takes the final admission decision according to steps S208 and S21CH. S214: The PD-FE sends a resource decision response, and the PE-FE installs the final admission decision. S216. The PE-FE responds to the CPE by using transport layer signaling. In the above process, the CPE initiates transport layer signaling, and the PE-FE is triggered. This is a pull mode process. In another case, the BTF is triggered and the BTF sends a message to the TRE-FE, which is another pull mode flow. Only the pull mode flow in which the PE-FE is triggered is considered in the prior art. Consider the existing multicast application scenario: TRC-FE is placed in both RACF and transmission functions. TRC-FE in RACF is called upper TRC-FE, and TRC-FE in transmission function is called local TRC-FE. The upper TRC-FE and the local TRC-FE are connected by the Rp reference point. The existing pull mode process cannot solve the pull mode resource admission control problem in this scenario. SUMMARY OF THE INVENTION In view of one or more of the above problems, the present invention provides a resource allocation method and a resource release method. The resource allocation method in the embodiment of the present invention includes the following steps: The basic transmission function entity sends a resource allocation request to the transmission resource control function entity by using the transmission resource execution function entity; and the transmission resource control function entity can satisfy the resource allocation request service in the current resource. In the case of the quality requirement, the resource decision request is sent to the policy decision function entity; the policy decision function entity determines the resource allocation policy, and sends the resource allocation policy to the case that the resource decision request can be accepted according to the information carried in the resource decision request. The policy execution function entity; and the policy execution function entity perform the resource allocation policy. The transmission resource control function entity refuses to allocate resources when the current resource cannot meet the quality of service requirement of the resource allocation request. The policy decision function entity refuses to allocate resources when it determines that the resource allocation request cannot be accepted according to the information carried in the resource decision request. After the service control function entity pre-authorizes the resource decision request, the policy decision function entity obtains the service information corresponding to the resource decision request from the service control function entity after receiving the resource decision request. The policy decision function entity determines whether the resource allocation request can be accepted according to whether the flow description information, the quality of service resource information, and/or the service information carried by the resource decision request are consistent with the network policy rule and the transmission subscription information. If they are consistent, the policy decision function entity determines that the resource allocation request can be accepted, otherwise the policy decision function entity determines that the resource allocation request cannot be accepted. The process of the basic transmission function entity sending a resource allocation request to the transmission resource control function entity includes the following steps: The basic transmission function entity sends a resource allocation request to the transmission resource execution function entity under the trigger of the transport layer signaling from the user terminal device. The transmission resource execution function entity forwards the resource allocation request to the transmission resource control function entity. After determining the resource allocation policy, the policy decision function entity sends the resource allocation policy to the transmission resource control function entity, and the transmission resource control function entity sends the resource allocation response carrying the resource allocation policy to the transmission resource execution function entity, and the transmission resource is executed. The functional entity performs the resource allocation policy. A resource release method according to an embodiment of the present invention includes the following steps: a basic transmission function entity Transmitting a resource release request by the transmission resource execution function entity and the transmission resource control function entity to the policy decision function entity; the policy decision function entity notifying the policy execution function entity to release the resource in response to the resource release request; and the policy execution function entity responding to the policy decision Notification of functional entities for resource release. In addition, the policy decision function entity reports to the service control function entity that the related resource is released before notifying the policy execution function entity to release the resource. The present invention solves the resource admission control problem in the pull mode triggered by the underlying transport function entity. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a RACF functional architecture of an ITU-T in the prior art; FIG. 2 is a flowchart of a resource admission control process in a pull mode triggered by a PE-FE in the prior art; FIG. 4 is a detailed flowchart of a resource allocation method in a pull mode according to an embodiment of the present invention; FIG. 5 is a diagram of resource modification in a pull mode according to an embodiment of the present invention; FIG. 6 is a schematic flowchart of a resource release method according to an embodiment of the present invention; and FIG. 7 is a detailed flowchart of a resource release method in a pull mode according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 3 is a schematic flow chart of a resource allocation method according to an embodiment of the present invention. As shown in FIG. 3, the resource allocation method includes the following steps: S302: The basic transmission function entity sends a resource allocation request to a transmission resource control function entity by using a transmission resource execution function entity; S304, the transmission resource control function entity can satisfy the resource in the current resource. In the case of assigning a request for quality of service requirements, to the policy The decision function entity sends a resource decision request; S306. The policy decision function entity determines a resource allocation policy when the resource decision request can be accepted according to the information carried in the resource decision request, and sends the resource allocation policy to the policy execution function entity to perform the resource. And: S308, the policy execution function entity executes the resource allocation policy. The transmission resource control function entity refuses to allocate resources when the current resource cannot meet the quality of service requirement of the resource allocation request. The policy decision function entity refuses to allocate resources when it determines that the resource allocation request cannot be accepted according to the information carried in the resource decision request. After the service control function entity pre-authorizes the resource decision request, the policy decision function entity obtains the service information corresponding to the resource decision request from the service control function entity after receiving the resource decision request. The policy decision function entity determines whether the resource allocation request can be accepted according to whether the flow description information, the quality of service resource information, and/or the service information carried by the resource decision request are consistent with the network policy rule and the transmission subscription information. If they are consistent, the policy decision function entity judges that resource allocation can be performed, otherwise the policy decision function entity judges that resource allocation cannot be performed. The process of the basic transmission function entity sending a resource allocation request to the transmission resource control function entity includes the following steps: The basic transmission function entity sends a resource allocation request to the transmission resource execution function entity under the trigger of the transport layer signaling from the user terminal device. The transmission resource execution function entity forwards the resource allocation request to the transmission resource control function entity. The policy decision function entity sends a resource decision response message to the transmission resource control function entity, where the message includes policy rule information. The transmission resource control function entity sends a resource decision response message to the transmission resource execution function entity, where the message includes the policy rule information required by the transmission resource control function entity to perform the transmission resource execution function entity, such as according to link related information (such as VLAN, VPN ID) MPLS LSP label) Complete the modification of the bandwidth of the MPLS LSP and set the ATM traffic management parameters. The transport layer signaling from the CPE triggers the BTF to send a resource modification message to the TRE-FE, where the message carries the QoS resource information, and other processes are similar to the resource request message. The transport layer signaling from the CPE triggers the BTF to send a resource release message to the TRE-FE, and other processes are similar to the resource request message. 4 is a detailed flowchart of a resource allocation method in a pull mode according to an embodiment of the present invention. As shown in Figure 4, the method includes the following steps: S402. The CPE directly requests resources from the BTF through path-coupled transport layer signaling. The transport layer signaling from the CPE triggers the BTF to send a resource request message.

S404: The BTF sends a resource request message to the TRE-FE, where the message carries QoS resource information.

S406: The TRE-FE sends a resource request message to the TRC-FE, where the message carries information such as a QoS parameter and a flow description.

S408: After receiving the resource request message from the TRE-FE, the TRC-FE checks the availability of the current resource. If available, a resource decision request message is sent to the PD-FE; if not available, the request is rejected.

S410, after the PD-FE receives the resource decision request message from the TRC-FE, if the previous SCF pre-authorizes the request, the PD-FE sends a resource operation request message to the SCF to obtain corresponding service information; The SCF does not pre-authorize the request and does not have to send the message.

S412: After receiving the resource request message, the PD-FE checks whether the flow description, the requested QoS resource, and the service information are consistent with the network policy rule and the transmission subscription information. If they are consistent, the PD-FE makes the last resource admission policy; if it is inconsistent, it rejects the request. S414, the PD-FE interacts with the PE-FE, and the PE-FE installs the QoS policy rule.

S416. The PD-FE sends a resource decision response message to the TRC-FE, where the message includes policy rule information.

S418: The TRC-FE sends a resource decision response message to the TRE-FE, where the message includes the policy rule information that the TRC-FE requires the TRE-FE to perform. For example, modify the bandwidth of the MPLS LSP and set the ATM traffic management parameters based on the link-related information (such as the VLAN, VPN ID, and MPLS LSP label).

S420: The TRE-FE sends a resource request response message to the BTF. S422. The BTF responds to the CPE by using transport layer signaling. 5 is a flow chart of a resource allocation method when resource modification occurs in a pull mode according to an embodiment of the present invention. As shown in Figure 5, the method packs the following steps:

S502. The CPE directly requests the BTF to modify the resource by using path-coupled transport layer signaling. The transport layer signaling from the CPE triggers the BTF to send a resource change request message. S504, BTF TRE-FE modified to send a resource request message, and the message carries the updated resource information Q ₀ S.

S506: The TRE-FE sends a resource modification request message to the TRC-FE, where the message carries updated QoS parameters, flow descriptions, and the like. S508. After receiving the resource modification request message from the TRE-FE, the TRC-FE checks the availability of the current resource. If available, the resource modification decision request message is sent to the PD-FE; if not available, the request is rejected.

S510, after receiving the resource request from the TRC-FE, the PD-FE sends a resource operation request message to the SCF to obtain the corresponding service information, if the previous SCF pre-authorizes the request; If the previous SCF did not pre-authorize the request, then the message does not have to be sent.

S512: After receiving the resource modification request message, the PD-FE checks whether the flow description, the updated QoS resource, and the service information are consistent with the network policy rule and the transmission subscription information. If they are consistent, the PD-FE makes the final resource admission policy; if it is inconsistent, it rejects the request. S514, the PD-FE interacts with the PE-FE, and the PE-FE installs the QoS policy rule.

S516. The PD-FE sends a resource modification decision response message to the TRC-FE, where the message includes policy rule information.

S518: The TRC-FE sends a resource modification policy to the TRE-FE, where the message includes the policy rule information that the TRC-FE requires the TRE-FE to perform. For example, modify the bandwidth of the MPLS LSP and set the ATM traffic management parameters based on the link-related information (such as the VLAN, VPN ID, and MPLS LSP label).

S520. The TRE-FE sends a resource modification request response message to the BTF.

S522. The BTF responds to the CPE by using transport layer signaling. FIG. 6 is a schematic flow chart of a resource release method according to an embodiment of the present invention. As shown in FIG. 6, the resource release method includes the following steps: S602: The basic transmission function entity sends a resource release request to a policy decision function entity by using a transmission resource execution function entity and a transmission resource control function entity; S604, the policy decision function entity responds to a resource release request, the notification policy execution function entity performs resource release; and S606, the policy execution function entity responds to the notification of the policy decision function entity, Release resources. In addition, the policy decision function entity reports to the service control function entity that the related resource is released before notifying the policy execution function entity to release the resource. FIG. 7 is a detailed flowchart of a resource release method in a pull mode according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

S702: The CPE directly releases resources to the BTF by using path-coupled transport layer signaling. The transport layer signaling from the CPE triggers the BTF to send a resource release request message.

S704. The BTF sends a resource dry request message to the TRE-FE.

S706. The TRE-FE sends a resource release request message to the TRC-FE.

S708: The TRC-FE sends a resource release request message to the PD-FE.

S710, PD-FE pass> > SCF related resources are released.

S712, the PE-FE releases related resources.

S714, the PD-FE replies to the resource release response.

S716, the TRC-FE replies to the resource release response.

S718, the TRE-FE replies to the resource release response.

S720, the BTF responds to the CPE by using transport layer signaling.

The above is only the embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. All modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

Claim

A resource allocation method, characterized in that the following steps are performed:

The basic transmission function entity sends a resource allocation request to the transmission resource control function entity through the transmission resource execution function entity;

The transmission resource control function entity sends a resource decision request to the policy decision function entity if the current resource can meet the quality of service requirement of the resource allocation request; the policy decision function entity is carried according to the resource decision request When the information is judged to be able to accept the resource allocation request, determine a resource allocation policy, and send the resource allocation policy to the policy execution function entity;

The policy enforcement function entity performs the resource allocation policy.

The resource allocation method according to claim 1, wherein the transmission resource control function entity rejects resource allocation if the current resource cannot satisfy the quality of service requirement of the resource allocation request.

The resource allocation method according to claim 2, wherein the policy decision function entity rejects resource allocation if it is determined that the resource allocation request cannot be accepted according to the information carried in the resource decision request.

The resource allocation method according to any one of claims 1 to 3, wherein, in a case where the service control function entity pre-authorizes the resource decision request, the policy decision function entity is After receiving the resource decision request, the service control function entity obtains service information corresponding to the resource decision request.

The resource allocation method according to claim 4, wherein the policy decision function entity according to the flow description information, the quality of service resource information, and/or the service information carried by the resource decision request is The network policy rule and the transmission subscription information are consistent to determine whether the resource allocation request can be accepted.

The resource allocation method according to claim 5, wherein, if they are consistent, the policy decision function entity determines that the resource allocation request can be accepted, otherwise the policy decision function entity determines that the resource allocation cannot be accepted. request.

The resource allocation method according to claim 6, wherein the process of sending the resource allocation request by the outbound transmission function entity to the transmission resource control function entity comprises the following steps:

Transmitting, by the basic transmission function entity, the resource allocation request to the transmission resource execution function entity, triggered by the transport layer signaling from the user terminal device;

The transmission resource execution function entity forwards the resource allocation request to the transmission resource control function entity.

The resource allocation method according to claim 7, wherein the policy decision function entity sends the resource allocation policy to the transmission resource control function entity after determining the resource allocation policy, The transmission resource control function entity sends a resource allocation response carrying the resource allocation policy to the transmission resource execution function entity, where the transmission resource execution function entity performs the resource allocation policy.

9. A resource release method, comprising the steps of:

The basic transmission function entity sends a resource release request to the policy decision function entity by using the transmission resource execution function entity and the transmission resource control function entity;

The policy decision function entity notifies the policy execution function entity to perform resource release in response to the resource release request;

The policy enforcement function entity performs resource release in response to the notification of the policy decision function entity.

The resource release method according to claim 9, wherein the policy decision function entity reports to the service control function entity that the related resource is dry before notifying the policy execution function entity to release the resource. .