WO2007014506A1 - Procédé et système de sélection du chemin de transmission d'un flux de média destiné aux réseaux de la prochaine génération network - Google Patents

Procédé et système de sélection du chemin de transmission d'un flux de média destiné aux réseaux de la prochaine génération network Download PDF

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Publication number
WO2007014506A1
WO2007014506A1 PCT/CN2006/001140 CN2006001140W WO2007014506A1 WO 2007014506 A1 WO2007014506 A1 WO 2007014506A1 CN 2006001140 W CN2006001140 W CN 2006001140W WO 2007014506 A1 WO2007014506 A1 WO 2007014506A1
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WIPO (PCT)
Prior art keywords
forwarding
service
media stream
ngn
control
Prior art date
Application number
PCT/CN2006/001140
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English (en)
French (fr)
Inventor
Enhui Liu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CNB200680011724XA priority Critical patent/CN100521622C/zh
Priority to AT06742028T priority patent/ATE436145T1/de
Priority to DE602006007675T priority patent/DE602006007675D1/de
Priority to EP06742028A priority patent/EP1816789B1/en
Publication of WO2007014506A1 publication Critical patent/WO2007014506A1/zh
Priority to US11/753,107 priority patent/US20070242667A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/302—Route determination based on requested QoS
    • H04L45/306—Route determination based on the nature of the carried application
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/302—Route determination based on requested QoS
    • H04L45/308—Route determination based on user's profile, e.g. premium users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS

Definitions

  • the present invention relates to the field of network communication technologies, and more particularly to a control system and method for selecting a forwarding path for a media stream in a Next Generation Network (NGN).
  • NTN Next Generation Network
  • NGN implements the separation of the service layer and the transport layer.
  • the transport layer is based on packet and optical technologies, and the service layer provides rich multimedia services.
  • IP Internet Protocol
  • Asynchronous Transfer Mode ATM
  • IPv4 Internet Protocol Version 4
  • MPLS Multiprotocol Label Switching
  • IPv6 Internet Protocol Version 6
  • VPNs virtual private networks
  • VLANs virtual local area networks
  • MPLS LSPs MPLS label switched paths
  • An edge node of an access network operator may also be connected to multiple core network operators to support users' freedom to select the needs of different core network operators.
  • the so-called selection of the core network and the core network path is ultimately to select a forward physical link, a virtual link, or a VPN for the media stream.
  • it is usually configured by statically configuring the device on the network boundary device. Routing and routing of core network traffic, such as a broadband access server (BRAS), an edge router (Edge Router), a provider edge device (Provider Edge), and a border router ( Border) Router) and so on.
  • BRAS broadband access server
  • Edge Router edge router
  • Provide Edge Provide Edge
  • Border Border
  • the static configuration mode can only support coarse-grained traffic aggregation and path guidance, and cannot support service priority processing, quality of service processing, and security level processing of the NGN service user-level session level.
  • LSP edge-to-edge label switched path
  • the method is limited to edge-to-edge path selection within an MPLS network, but the transmission techniques at the network edge exit and inter-domain interconnect links are diverse.
  • a main object of the present invention is to provide a control system and method for selecting a forwarding path for a media stream in an NGN network, to implement fine-grained user-level and session-level NGN services.
  • the selection of core network and the choice of core network path enhance the service quality and security assurance capability of NGN.
  • Another object of the present invention is to provide a method for selecting a forwarding path for a media stream in an NGN network, to implement fine-grained core network selection and core network path selection of user-level and session-level NGN services, and to enhance NGN service quality and Security assurance capabilities.
  • the present invention provides a control system for selecting a forwarding path for a media stream in an NGN network, including:
  • the application layer signaling parsing module is configured to be configured in the service control device, configured to parse the application layer signaling, determine the forwarding requirement information of the service media stream, and provide the information to the policy decision function entity; the policy decision function entity: according to the service media The forwarding requirement information of the flow and the policy information saved by the flow determine the forward path identification information of the service, and provide the traffic forwarding control module;
  • the traffic forwarding control module is configured to perform forwarding control on the service media flow according to the forward path identification information, and direct the media traffic to the corresponding forward path.
  • the system also includes:
  • the resource and admission control function entity 'for obtaining the forwarding demand information of the media stream and the forward path identification information determined by the policy decision function entity, and performing corresponding resource admission control processing, when the resource admission control is passed,
  • the forward path identification information is provided by the policy decision function entity to the traffic forwarding control module.
  • the service control device includes:
  • the proxy call session control function entity in the I M S P-CSCF or a call agent device in the NGN softswitch system, or a proxy-enabled service control device in other NGN service systems.
  • the policy decision function entity is set in the service control device or the network border device, or is set as an independent device.
  • the present invention also provides a control method for selecting a forwarding path for a media stream in an NGN network, including:
  • the application layer signaling parsing module in the service control device parses the application layer signaling, determines the forwarding requirement information of the service media stream, and provides the information to the policy decision function entity;
  • the policy decision function entity determines the forward path identification information of the media stream forwarding according to the forwarding requirement information of the service media stream and the policy information saved by the service media, and provides the traffic forwarding control module in the network border device;
  • the traffic forwarding control module in the network edge device forwards and controls the service media flow according to the forward path identification information, and directs the media traffic to the corresponding forward path.
  • the forwarding requirement information of the service media stream includes:
  • the media stream identification information of the service and the service quality and priority requirement information of the service are provided.
  • the step B described includes:
  • the policy decision function entity provides the forward path identification information and the forwarding requirement information of the media stream to the resource and the admission control entity, and performs resource admission control processing;
  • the forward path identification information is provided to the traffic forwarding control module.
  • the step C described includes:
  • the traffic forwarding control module in the network edge device forwards and controls the media stream according to the forward path identification information, and directs the media traffic to the corresponding forward path.
  • the forward path identification information may be: a physical link identified by a device port number, or a VPN VPN forwarding instance VRF of a VPN, or a virtual local area network identification VLAN ID, or an MPLS path label MPLS LSP LABEL, or various encapsulation types. Tunnel ID.
  • the service control device includes: a proxy call session control function entity P-CSCF in the multimedia subsystem IMS of the NGN, or a call proxy device in a softswitch system of the NGN, or a proxy function in other NGN service systems.
  • a proxy call session control function entity P-CSCF in the multimedia subsystem IMS of the NGN
  • a call proxy device in a softswitch system of the NGN
  • a proxy function in other NGN service systems a proxy function in other NGN service systems.
  • the present invention controls at the edge of the network edge and the inter-domain interconnection link. If the MPLS network is forwarded, the existing MPLS network is used. There are path selection schemes described in the technique, so that end-to-end cross-domain path selection can be achieved.
  • the invention can realize the core network selection and core network path selection of the NGN service user level and the session level finely by the cooperation between the service control device and the network border device located at the transport layer, so as to enhance the service quality and security guarantee of the NGN. ability. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic structural view of a system according to the present invention.
  • FIG. 2 is a schematic flow diagram of an exemplary method in accordance with the present invention. Mode for carrying out the invention
  • the present invention provides a control system and method for selecting a forwarding path for a media stream in an NGN network, specifically a control system and method for selecting a core network and a core network path for a media stream, through service control services and located transmission
  • the collaborative work between the network edge devices of the layer can implement fine-grained core network selection and core network path selection of the NGN service user-level and session-level to enhance the service quality and security assurance capability of the NGN.
  • the system and method provided by the present invention can be well combined with the internal path selection scheme in the MPLS network described in the prior art, and the path selection scheme provided by the present invention is used for control at the network edge exit and the inter-domain interconnection link. If the MPLS network is forwarded into the MPLS network, the internal MPLS network selection scheme is used for control, so that the end-to-end cross-domain path selection can be implemented.
  • the present invention provides a control system and method for selecting a core network and a core network path for a media stream.
  • the NGN service user level and the tongue level can be realized through the collaborative work between the service control device and the network boundary device located at the transport layer. Fine-grained core network selection and core network path selection to enhance NGN's service quality and security assurance capabilities.
  • the present invention provides a control system and method for selecting a core network and a core network path for a media stream, and selecting a core network and a core network for the media stream based on the policy rules based on the priority of the user session, the service shield amount, and the security level requirement information.
  • Path which controls the traffic forwarding behavior of network edge devices.
  • control, system and method provided by the present invention can be integrated into the NGN resource and admission control framework as a comprehensive solution for NGN service shield control, NAPT traversal and firewall control, or can be independently applied to the NGN network.
  • the control system for selecting a core network and a core network path for a media stream in the NGN network may specifically include:
  • an application layer signaling parsing module configured in the service control device, configured to parse processing application layer signaling of the service to determine forwarding request information of the service media stream, and provide the policy decision function entity;
  • the service control device is usually a service control proxy, and may specifically be a P-CSCF' in the NGN IP Multimedia Subsystem (IMS), or a CallAgent in the NGN Softswitch. (call agent) device.
  • IMS NGN IP Multimedia Subsystem
  • call agent CallAgent
  • a policy decision function entity configured to determine forward path identification information of the media stream forwarding according to the forwarding demand information of the service media stream and the policy information saved by the service media, and provide the traffic forwarding control module to the traffic forwarding control module; It can be a standalone device or a functional module integrated in a service control device or a network edge device.
  • a traffic forwarding control module configured to perform forwarding control on the service media flow according to the forward path identification information
  • the network edge device whose module is located on the media stream path selects the forward path for the media stream, for example, BRAS (Broadband Access Server), Edge Router (Edge Router), Provider Edge (Proxy 3 ⁇ 4: Backup), Border Router ( Border router).
  • the system further includes a resource and admission control function entity, where the resource and admission control function entity is configured to obtain forwarding requirement information of the media stream and forward path identification information determined by the policy decision function entity, and perform corresponding The resource admission control process is performed by the policy decision function entity to provide the forward path identification information to the traffic forwarding control module when the resource admission control is passed.
  • Step 21 In a service control device
  • the application layer signaling parsing module parses and processes the application layer signaling stream.
  • Step 22 The application layer signaling parsing module in the service control device determines the forwarding requirement information of the service media stream, and provides the information to the policy decision function entity, where the application layer signaling parsing module in the service forwarding control device sends the service media stream.
  • the identity, along with forwarding requirements information such as its quality of service requirements, business priority requirements, and security level requirements, is provided to the policy decision function entity.
  • the application layer signaling parsing module in the service control device specifically determines the forwarding requirement information of the corresponding service media stream according to the application type, the user attribute, and the media stream information carried in the application signaling. ;
  • Step 23 The policy decision function entity determines the forward path identifier for the media stream based on the received media stream identifier and the media stream forwarding requirement information based on the saved policy rule information.
  • the policy rule information is flexibly formulated by the business according to the network planning and deployment situation. Therefore, it will not be described in detail. ;
  • the identifier of the forward path may be: a physical link identified by a device port number, or
  • VPN VRF VPN routing forwarding instance
  • VLAN ID virtual LAN ID
  • MPLS LSP LABEL MPLS path: label
  • tunnel ID of various encapsulation types, and so on.
  • Step 24 The policy decision function entity provides the media stream identifier of the service and the control information including the forward path identifier information to the traffic forwarding control module in the network border device, so as to control the traffic forwarding behavior of the network border device.
  • Step 25 The traffic forwarding control module in the network edge device performs a traffic forwarding behavior according to the received media stream identifier and its forward path identifier, and sends the media stream to the selected forward path.
  • step 23 if the RACF (resource and admission control function) exists in the forward network to which the forward path is connected, the policy decision function entity may further identify the received media stream identifier, forwarding requirement information, and the determined The forward path identification is provided together with the RACF in the forward network for resource admission control within the network it governs. If the resource admission control result in the forward network does not pass, step 24 and step 25 are not performed, and when the resource admission control result is passed, step 24 and step 25 are performed.
  • the present invention can implement core network selection and core network path selection of user-level and fine-grained NGN services by using the service control device and the network boundary device located at the transport layer to enhance the NGN. Quality of service and security assurance capabilities.

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Description

在下一代网络中为媒体流选择转发路径的控制系统及方法 技术领域
本发明涉及网络通信技术领域， 更具体地说， 涉及一种在下一代网 路（NGN ) 中为媒体流选择转发路径的控制系统及方法。 发明背景
NGN实现了业务层与传送层分离， 其中传送层基于分组和光技术， 业务层提供丰富的多媒体业务。 由于 NGN网络为基于网际协议（IP )分 组技术， 因此， NGN业务的安全和服务质量是开展网络业务需要解决的 主要问题。 在 NGN网络中， 影响网络安全和服务质量的因素很多， 传送 技术和传送路径的不同无疑会对网络安全和服务质量造成影响。
在网络演进和融合过程中， 运营商通常会新旧网络并存， 核心网中 可能有多个物理相互隔离的转接网络同时运营， 如： 异步传输模式 ( ATM )网络、 网际协议笫四版（ IPv4 )网络、多协议标签交换 ( MPLS ) 网络、 网际协议第六版（IPv6 ) 网络等， 这些转接网络由于传送技术的 不同导致其服务质量和安全保证能力也不同。
为此， 需要在网络边缘使用各种虚拟专用网 （VPN ) 、 虚拟局域网 ( VLAN ) 、 MPLS标签交换路径 ( MPLS LSP )和其他隧道技术来聚合 和隔离核心网络中各类流量， 以提高网络服务质量和实现安全保证。
接入网运营商的边缘节点也可能与多个核心网运营商连接， 以支持 用户自由选择不同核心网运营商的需求。
因此， 在网络边缘为媒体流选择核心网和核心网路径的需求是常见 的， 所谓选择核心网和核心网路径归根结底是为媒体流选择前向物理链 路、 虚拟链路或 VPN。 目前， 通常是通过在网络边界设备上静态配置策 略路由来进行核心网流量的聚合和路径 导， 所述的网络边界设备诸如 可为宽带接入服务器（BRAS )、 边缘路由器（Edge Router )、 提供商 边界设备 ( Provider Edge ) 、 边界路由器（ Border Router )等。
然而， 所述的静态配置方式只能支持粗粒度的流量聚合和路径引 导， 无法支持 NGN业务用户级会话级的业务优先级处理、服务质量处理 和安全级别处理。
目前， 还存在一种在 MPLS网络上采用带宽管理器或者路径计算单 元， 为流量实时计算网絡中边缘到边缘的标签交换路径（LSP )的方案， 主要依据流量的服务质量需求和网络内部资源的可获得情况及使用情 况进行计算， 以避免发生拥塞和竟争而导致网络服务质量下降。
该方法局限于一个 MPLS网络内的边缘到边缘的路径选择， 但网络 边缘出口处和域间互连链路的传送技术是多样化的。
因此， 该方法不适于网络边缘出口处采用其他技术（如物理链路隔 离、各种 VPN、 VLAN和各种隧道技术）对流量聚合和路径引导的情形， 也不适于不同网絡域之间互连链路的选择。 发明内容 , 鉴于上述现有技术所存在的问题， 本发明的主要目的是提供一种在 NGN网络中为媒体流选择转发路径的控制系统及方法 ,以实现 NGN业务 用户级和会话级细粒度的 ά心网选择和核心网路径选择，增强 NGN的服 务质量和安全保证能力。
本发明的另一目的是提供一种在 NGN网絡中为媒体流选择转发路 径的方法， 以实现 NGN业务用户级和会话级细粒度的核心网选择和核心 网路径选择， 增强 NGN的服务质量和安全保证能力。
本发明的目的是通过以下技术方案实现的： 本发明提供了一种在 NGN网络中为媒体流选择转发路径的控制系 统， 包括：
应用层信令解析模块： 设置于业务控制设备中， 用于解析应用层信 令， 确定业务媒体流的转发需求信息， 并提供给策略决策功能实体； 策略决策功能实体： 根据所述的业务媒体流的转发需求信息及自身 保存的策略信息确定业务的前向路径标识信息， 并提供给流量转发控制 模块；
流量转发控制模块： 设置于网络边界设备中， 根据所述的前向路径 标识信息对业务媒体流进行转发控制， 将媒体流量导向相应的前向路 径。
该系统还包括：
资源和准入控制功能实体： '用于获取媒体流的转发需求信息和策略 决策功能实体所确定的前向路径标识信息， 并进行相应的资源准入控制 处理， 当资源准入控制通过时， 由策略决策功能实体将所述的前向路径 标识信息提供给流量转发控制模块。
所述的业务控制设备包括：
N G N的多媒体子系统 I M S中的代理呼叫会话控制功能实体 P-CSCF, 或者， NGN的软交换系统中的呼叫代理设备， 或者 NGN其他 业务系统中的具有代理功能的业务控制设备。
所述的策略决策功能实体设置于业务控制设备或网 边界设备中， 或者设置为独立的设备。
本发明还提供了一种在 NGN网络中为媒体流选择转发路径的控制 方法， 包括：
A、 业务控制设备中的应用层信令解析模块解析应用层信令， 确定 业务媒体流的转发需求信息， 并提供给策略决策功能实体； B、 策略决策功能实体根据所述的业务媒体流的转发需求信息及自 身保存的策略信息确定媒体流转发的前向路径标识信息， 并提供给网络 边界设备中的流量转发控制模块；
C、 网络边界设备中的流量转发控制模块根据所述的前向路径标识 信息对业务媒体流进行转发控制， 将媒体流量导向相应的前向路径。
所述的业务媒体流的转发需求信息包括：
业务的媒体流标识信息和业务的服务质量和优先级需求信息。
所述的步骤 B包括：
策略决策功能实体将所述的前向路径标识信息和媒体流的转发需 求信息提供给资源和准入控制实体， 进行资源准入控制处理；
当策略决策功能实体确定资源准入控制通过时， 则将所述的前向路 径标识信息提供给流量转发控制模块。
所述的步骤 C包括：
网络边界设备中的流量转发控制模块根据所述的前向路径标识信 息对媒体流进行转发控制， 将媒体流量导向相应的前向路径。
所述的前向路径标识信息可以是： 以设备端口号标识的物理链路、 或 VPN的 VPN路由转发实例 VRF、或虚拟局域网标识 VLAN ID、或 MPLS 路径标签 MPLS LSP LABEL、 或各种封装类型的隧道 ID。
所述的业务控制设备包括： NGN的多媒体子系统 IMS中的代理呼叫 会话控制功能实体 P-CSCF, 或者， NGN的软交换系统中的呼叫代理设 备， 或者 NGN其他业务系统中的具有代理功能的业务控制设备。
由上述本发明提供的技术;^案可以看出， 本发明是在网络边缘出口 处和域间互连链路处进行控制， 如果前向进入 MPLS网络， 则在所进入 的 MPLS网络内部采用现有技术中描述的路径选择方案， 从而可以实现 端到端的跨域的路径选择。 本发明通过业务控制设备与位于传送层的网络边界设备之间的协 同工作，可以实现 NGN业务用户级和会话级细粒度的核心网选择和核心 网路径选择， 以增强 NGN的服务质量和安全保证能力。 附图简要说明
图 1为才艮据本发明所述的系统的示范性结构示意图；
图 2为根据本发明所述的方法的示范性流程示意图。 实施本发明的方式
为使本发明的目的、 技术方案和优点表达得更加清楚明白， 下面结 合附图及具体实施例对本发明再作进一步详细的说明。
本发明提供了一种在 NGN网络中为媒体流选择转发路径的控制系 统及方法， 具体为一种为媒体流选择核心网和核心网路径的控制系统和 方法， 通过业务控制设务与位于传送层的网络边界设备之间的协同工 作，可以实现 NGN业务用户级和会话級细粒度的核心网选择和核心网路 径选择， 以增强 NGN的服务质量和安全保证能力。
本发明提供的系统和方法可以很好地与现有技术描述的在 MPLS网 络内部路径选择方案结合使用 , 在网络边缘出口处和域间互连链路处采 用本发明提供的路径选择方案进行控制， 如果前向进入 MPLS网络， 则 在所进入的 MPLS网络内部采用在 MPLS网络内部选择方案进行控制，从 而可以实现端到端的跨域的路径选择。
本发明提供了一种为媒体流选择核心网和核心网路径的控制系统 和方法， 通过业务控制设备与位于传送层的网络边界设备之间的协同工 作，可以实现 NGN业务用户级和 ^舌级细粒度的核心网选择和核心网路 径选择， 以增强 NGN的服务质量和安全保证能力。 本发明提供了一种为媒体流选择核心网和核心网路径的控制系统 和方法， 根据用户会话的优先级、 服务盾量和安全级别需求信息， 基于 策略规则为媒体流选择核心网和核心网路径， 控制网络边界设备的流量 转发行为。
本发明所提供的控制,系统和方法可以集成在 NGN的资源和准入控 制框架中作为 NGN服务盾量控制、 NAPT穿越和防火墙控制的综合方案 应用， 也可以独立应用于 NGN网絡中。
图 1为根据本发明所述的系统的示范性结构示意图。 本发明提供的 在 NGN网络中为媒体流选择核心网和核心网路径的控制系统， 如图 1所 示， 可以具体包括：
( 1 )应用层信令解析模块： 设置于业务控制设备中， 用于对业务 的应用层信令进行解析处理， 以确定业务媒体流的转发需求信息， 并提 供给策略决策功能实体；
所述的业务控制设备通常是业务控制代理，具体可以为 NGN IP多媒 体子系统 （IMS ) 中的 P-CSCF' ( ^理呼叫会话控制功能） 实体， 或者 NGN软交换系统（Softswitch ) 中的 CallAgent (呼叫代理）设备。
( 2 ) 策略决策功能实体， 用于根据所述的业务媒体流的转发需求 信息及自身保存的策略信息确定媒体流转发的前向路径标识信息， 并提 供给流量转发控制模块； 策略决策功能实体可以是一个独立设备， 也可 以是集成在业务控制设备， 或是网络边界设备中的一个功能模块。
( 3 ) 流量转发控制模块， 用于根据所述的前向路径标识信息对业 务媒体流进行转发控制；
即该模块位于媒体流路径上的网络边界设备为媒体流选择前向路 径， 例如， BRAS (宽带接人服务器） 、 Edge Router (边缘路由器） 、 Provider Edge (提供商 ¾：备） 、 Border Router (边界路由器） 。 优选地， 该系统进一步包括资源和准入控制功能实体， 所述资源和 准入控制功能实体用于获取媒体流的转发需求信息和策略决策功能实 体所确定的前向路径标识信息， 并进行相应的资源准入控制处理， 当资 源准入控制通过时， 由策略决策功能实体将所述的前向路径标识信息提 供给流量转发控制模块。
基于图 1所示的控制系统， 本发明所述的在 NGN网络中为媒体流选 择核心网和核心网路径的方法的具体实现方式如图 2所示， 具体包括： 步骤 21： 业务控制设备中的应用层信令解析模块对应用层信令流进 行解析和处理。
由于不同的应用将会使用不同的信令协议， 比如 SIP (会话初始协 议） /SDP (会话描述协议） ， H.323, 等等， 而且， 针对不同的协议解 析出的信息也各不相同， 因此， 本发明将不具体限定解析获得的信息内 容。
步骤 22: 业务控制设备中的应用层信令解析模块确定业务媒体流的 转发需求信息， 并提供给策略决策功能实体， 具体为： 业务转发控制设 备中的应用层信令解析模块将业务媒体流的标识， 连同其服务质量需 求、 业务优先级需求和安全级别需求等转发需求信息一起提供给策略决 策功能实体。
所述的业务控制设备中的应用层信令解析模块具体是根据应用类 型、 用户属性、 和应用信令中所携带的媒体流信息， 确定相应的业务媒 体流的转发需求信息。；
步骤 23: 策略决策功能实体根据所收到的媒体流标识及媒体流的转 发需求信息， 基于自身保存的策略规则信息为媒体流确定前向路径标 识。
所述的策略规则信息由 营商根据网络规划和部署情况灵活制定， 故再此不详细描述。 ；
所述的前向路径的标识可以是： 以设备端口号标识的物理链路、 或
VPN的 VRF ( VPN路由转发实例） 、 或 VLAN ID (虚拟局域网标识） 、 或 MPLS LSP LABEL ( MPLS路^:标签） 、 或各种封装类型的隧道 ID, 等等。
步骤 24: 策略决策功能实体将该业务的媒体流标识和包括前向路径 标识信息的控制信息提供给网络边界设备中的流量转发控制模块， 以便 于控制网络边界设备的流量转发行为。
步骤 25: 网络边界设备中的流量转发控制模块根据所收到的媒体流 标识及其前向路径标识， 执行流量转发行为， 将媒体流送入所选择的前 向路径。 '
在上述步骤 23中，如果前向路径所连接的前向网络中存在 RACF(资 源和准入控制功能) ， 则策略决策功能实体还可以将所收到的媒体流标 识、 转发需求信息和所确定的前向路径标识一起提供给前向网络中的 RACF在其所管辖的网絡内进行资源准入控制。 如果前向网络中资源准 入控制结果不通过的话， 则不会执行步驟 24和步驟 25, 而在资源准入控 制结果为通过时， 再执行步骤 24和步骤 25。
综上所述， 本发明通过业务控制设备与位于传送层的网络边界设备 之间的协同工作，可以实现 NGN业务用户级和^级细粒度的核心网选 择和核心网路径选择， 以增强 NGN的服务质量和安全保证能力。
以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范围 并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应该以权'利要求的保护范围为准。

Claims

权利要求书
1、 一种在下一代 NGN网络中为媒体流选择转发路径的控制系统， 其特征在于， 包括
应用层信令解析模块： 设置于业务控制设备中， 用于解析应用层信 令， 确定业务媒体流的转发需求信息， 并提供给策略决策功能实体； 策略决策功能实体： 根据所述的业务媒体流的转发需求信息及自身 保存的策略信息确定业务的前向路径标识信息， 并提供给流量转发控制 模块
流量转发控制模块： 设置于网络边界设备中， 根据所述的前向路径 标识信息对业务媒体流进行转发控制， 将媒体流量导向相应的前向路 径。
2、根据权利要求 1所述的在 NGN网络中为媒体流选择转发路径的 控制系统， 其特征在于， 该系统还包括：
资源和准入控制功能实休： 用于获取媒体流的转发需求信息和策略 决策功能实体所确定的前向路径标识信息， 并进行相应的资源准入控制 处理， 当资源准入控制通过时， '由策略决策功能实体将所述的前向路径 标识信息提供给流量转发控制模块。
3、根据权利要求 1或 2所述在 NGN网络中为媒体流选择转发路径 的控制系统， 其特征在于， 所述的业务控制设备包括：
NGN 的多媒体子系统 IMS 中的代理呼叫会话控制功能实体 P-CSCF, 或者， NGN的软交换系统中的呼叫代理设备， 或者 NGN其他 业务系统中的具有代理功能的业务控制设备。
4、根据权利要求 1或 2所述的在 NGN网络中为媒体流选择转发路 径的控制系统， 其特征在于， 所述的策略决策功能实体设置于业务控制 设备或网络边界设备中， 或者设置为独立的设备。
5、 一种在 NGN网絡中为媒体流选择转发路径的控制方法， 其特征 在于， 包括：
A、 业务控制设备中的应用层信令解析模块解析应用层信令， 确定 业务媒体流的转发需求信息， 并提供给策略决策功能实体；
B、 策略决策功能实体根据所述的业务媒体流的转发需求信息及自 身保存的策略信息确定媒体流转发的前向路径标识信息， 并提供给网络 边界设备中的流量转发控制模块；
C、 网络边界设备中的流量转发控制模块根据所述的前向路径标识 信息对业务媒体流进行转发控制， 将媒体流量导向相应的前向路径。
6、根据权利要求 5所述的在 NGN网络中为媒体流选择转发路径的 控制方法， 其特征在于， 所述的业务媒体流的转发需求信息包括:
业务的媒体流标识信息和业务的服务质量和优先级需求信息。
7、根据权利要求 5所述的在 NGN网络中为媒体流选择转发路径的 控制方法， 其特征在于， 所述的步骤 B包括：
策略决策功能实体将所述的前向路径标识信息和媒体流的转发需求 信息提供给资源和准入控制实体， 进行资源准入控制处理；
当策略决策功能实体确定资源准入控制通过时， 则将所述的前向路 径标识信息提供给流量转发控制模块。
8、 根据权利要求 5、 6或 7所述的在 NGN网络中为媒体流选择转 发路径的控制方法， 其特征在于， 所述的步骤 C包括：
网絡边界设备中的流量转发控制模块才艮据所述的前向路径标识信息 对媒体流进行转发控制， 将媒体流量导向相应的前向路径。
9、根据权利要求 8所述的在 NGN网络中为媒体流选择转发路径的 控制方法， 其特征在于， 所述的前向路径标识信息可以是： 以设备端口 号标识的物理链路、 或 VPN的 VPN路由转发实例 VRF、 或虚拟局域网 标识 VLAN ID、 或 MPLS路径标签 MPLS LSP LABEL、 或各种封装类 型的隧道 ID。
10、 根据权利要求 5所述的在 NGN网络中为媒体流选择转发路径 的控制方法， 其特征在于， 所述的业务控制设备包括： NGN的多媒体子 系统 IMS中的代理呼叫会话控制功能实体 P-CSCF, 或者， NGN的软交 换系统中的呼叫代理设备， 或者 NGN其他业务系统中的具有代理功能 的业务控制设备。
PCT/CN2006/001140 2005-07-30 2006-05-29 Procédé et système de sélection du chemin de transmission d'un flux de média destiné aux réseaux de la prochaine génération network WO2007014506A1 (fr)

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ATE436145T1 (de) 2009-07-15
US20070242667A1 (en) 2007-10-18
EP1816789A1 (en) 2007-08-08
DE602006007675D1 (de) 2009-08-20
EP1816789A4 (en) 2007-11-21
CN101156366A (zh) 2008-04-02
EP1816789B1 (en) 2009-07-08

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