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WO2009092208A1 - 一种家庭网关策略控制方法及系统 - Google Patents

一种家庭网关策略控制方法及系统 Download PDF

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Publication number
WO2009092208A1
WO2009092208A1 PCT/CN2008/071067 CN2008071067W WO2009092208A1 WO 2009092208 A1 WO2009092208 A1 WO 2009092208A1 CN 2008071067 W CN2008071067 W CN 2008071067W WO 2009092208 A1 WO2009092208 A1 WO 2009092208A1
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WO
WIPO (PCT)
Prior art keywords
policy
home gateway
qos
uplink
priority
Prior art date
Application number
PCT/CN2008/071067
Other languages
English (en)
French (fr)
Inventor
Mo SUN
Jun Song
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Priority to ES08748669.2T priority Critical patent/ES2645534T3/es
Priority to EP08748669.2A priority patent/EP2254292B1/en
Priority to US12/864,223 priority patent/US20100309926A1/en
Publication of WO2009092208A1 publication Critical patent/WO2009092208A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • 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
    • H04L45/24—Multipath
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/20—Traffic policing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/78—Architectures of resource allocation
    • H04L47/782—Hierarchical allocation of resources, e.g. involving a hierarchy of local and centralised entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/805—QOS or priority aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the present invention relates to the field of communications, and in particular, to a home gateway policy control method and system in an NGN (Next Generation Network).
  • NGN Next Generation Network
  • the packet technology especially the IP technology
  • the bearer network which makes the problem of QoS (Quality of Service) particularly prominent.
  • the ITU International Telecommunication Union
  • RACF Resource and Admission Control Function
  • the main function of the RACF is based on the operational policy rules, based on the user's subscription QoS information and available resources within the network for resource admission control. It shields the application layer from the difference of the bearer layer, and maps the QoS attributes of the application layer to the bearer layer, so that the bearer layer transport entity can provide QoS guarantee for the media stream of the session under its guidance.
  • the PD-FE Policy Decision Function Entity
  • SCF Service Control Function
  • NACF Network Attachment Control Function, Network
  • the user's transmission resource subscription information acquired by the adjunct control function entity makes a preliminary QoS resource decision, and then interacts with the TRC-FE (Transport Resource Control Function Entity) to confirm whether there are sufficient QoS resources, and finally Make a final decision and deliver the final decision to the PE-FE (Policy Execute Function Entity).
  • TRC-FE Transport Resource Control Function Entity
  • 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, collecting and reporting resource usage information, etc.).
  • the TRE-FE Transport Resource Execute Function Entity protocol
  • the current description is to implement the Layer 2 policy implementation related to the transmission technology under the guidance of TRC-FE, but the specific functions and scope are not determined.
  • the RACF needs to deliver the policy to the boundary of these subnet segments after making policy decisions based on the resource request of the service flow.
  • the policy execution function puts the QoS priority label or label of the network segment according to the policy according to the policy to ensure its QoS in the network segment.
  • FIG. 2 is a schematic diagram of policy control in a DSL access network.
  • the DSL (Digital Subscriber Line) access network is used as an example.
  • the RACF When the user equipment CPE/CPN is accessed through DSL, the RACF generates control according to the resource request.
  • the policy is delivered to the BRAS (Bandwidth Remote Access Server), which is executed by the BRAS.
  • the SR Service Router
  • SR Service Router
  • the main content of the policy includes service flow template and QoS information.
  • the QoS information includes: gating, upstream and downstream traffic bandwidth, QoS priority, and so on.
  • a service flow template (such as an IP quintuple, that is, a protocol, a source address, a destination address, a source port, and a destination port) is used to match the received packets. If the matching is successful, the policy is described in the execution policy. QoS control.
  • the QoS priority is used to describe the service priority of the service flow.
  • the network segment of the transport layer has different mappings.
  • the value of the mapped priority is set in the field of the service priority of the packet header, such as IP.
  • the DSCP DiffServ Code Point
  • the DSCP DiffServ Code Point
  • the Priority field in the VLAN Virtual Local Area Network
  • the CoS in the MPLS Multi Protocol Label Switching Architecture
  • the uplink bandwidth is the maximum upstream bandwidth allowed by the service data flow; the downlink bandwidth is the number of services. The maximum downstream bandwidth allowed by the flow.
  • the gate control refers to whether a certain service flow is allowed to pass.
  • the RACF can issue some gates according to the service signed by the user.
  • the subsequent users can also update the control through dynamic application.
  • the BRAS When the BRAS performs policy enforcement, when the user's upstream traffic passes through the BRAS, the BRAS identifies the packet template (such as the IP quintuple) in the policy. If it can match, the QoS information in the policy is the "3 ⁇ 4 text". The IP header is tagged with the corresponding QoS priority, and the IP device behind it guarantees the QoS of the message according to the priority tag.
  • the BRAS performs similar processing on the downlink traffic according to the policy. That is, according to the policy, the QoS priority label is applied to the second layer header such as the VLAN tag (VLAN tag), and the Layer 2 device in the downlink direction guarantees the QoS according to the label.
  • the metropolitan area network convergence layer that is, the load from the first central office equipment connected to the user to the service access server (BRAS/SR) is heavier. Therefore, this section is especially needed.
  • the network provides an effective QoS guarantee.
  • the current RACF control mode can only perform effective QoS control on the downlink packets of the aggregation layer, and the uplink packets can only perform QoS control after reaching the BRAS, which is not perfect. Therefore, it is necessary to perform QoS control from the upper and lower entrances of the aggregation layer.
  • the technical problem to be solved by the present invention is to provide a home gateway policy control method and system, which solves the problem that the load of the metropolitan area network aggregation layer is heavy in the prior art, and it is difficult to perform effective QoS control on the uplink packet.
  • the problem is to provide a home gateway policy control method and system, which solves the problem that the load of the metropolitan area network aggregation layer is heavy in the prior art, and it is difficult to perform effective QoS control on the uplink packet.
  • the present invention provides a home gateway policy control method, in which a resource access control function entity delivers a policy to a home gateway, and the home gateway performs policy execution on the uplink message of the home gateway according to the received policy.
  • the content of the policy includes at least a service flow template and QoS information
  • the QoS information includes: a gate, an uplink and downlink traffic bandwidth, and a QoS priority
  • the home gateway identifies the uplink packet passing the home gateway according to the service flow template, and performs the following operations on the identified packet flow according to the policy:
  • the uplink type of the home gateway access is a digital user access multiplexer
  • multiple permanent virtual channels between the home gateway and the digital user access multiplexer are respectively associated with the QoS priority Corresponding to different QoS levels;
  • the home gateway accesses the uplink packet to a permanent virtual channel of a corresponding QoS level according to the QoS priority;
  • the digital user access multiplexer sets the VLAN tag of the packet in the channel or the corresponding priority tag in the VLAN tag and the IP header according to the QoS level of the permanent virtual channel.
  • the home gateway sets the VLAN tag of the corresponding service flow of the uplink packet according to the policy content, or simultaneously puts the corresponding QoS in the VLAN tag and the IP header. Priority tag.
  • the home gateway is configured with a static policy, and the static policy is activated and deactivated by the resource admission control function by using the policy ID.
  • the present invention also provides a home gateway policy control system, which is connected to a layer 2 aggregation network and a service access server, and includes a resource admission control function entity and a home gateway, where the home gateway includes a home policy enforcement function entity, where : a resource admission control function entity, configured to send a policy to the home policy enforcement function entity and the service access server;
  • the home policy enforcement function entity is configured to perform policy execution on an uplink packet that passes through the home gateway after receiving the policy.
  • family policy execution function entity includes:
  • An identification module configured to identify, according to the service flow template in the policy content, an uplink message that passes through the home gateway, and if the identification succeeds, send the message to the QoS execution module;
  • a QoS execution module configured to gate the packet flow, limit the uplink bandwidth of the packet flow, perform uplink on the packet flow according to the type of the uplink accessed by the home gateway, and the QoS priority Supported QoS priority processing.
  • the system includes a digital user access multiplexer, the home gateway accesses a digital user access multiplexer, and the digital user access multiplexer accesses the service access through a Layer 2 aggregation network.
  • a server and the plurality of permanent virtual channels between the home gateway and the digital user access multiplexer respectively correspond to different QoS levels of the QoS priority;
  • the QoS execution module accesses the uplink packet to a permanent virtual channel of a corresponding QoS level according to the QoS priority;
  • the digital user access multiplexer sets the VLAN tag of the packet in the channel or the corresponding priority tag in the VLAN tag and the IP header according to the QoS level of the permanent virtual channel.
  • the home gateway accesses the Ethernet switch, and directly accesses the service access server through the Layer 2 aggregation network;
  • the QoS execution module tags the VLAN tag of the corresponding service flow of the uplink packet according to the policy content, or simultaneously puts a corresponding QoS priority mark in the VLAN tag and the IP header.
  • the home policy enforcement function entity includes a static policy configuration module, configured to statically configure a policy, where the resource admission control function performs an activation and deactivation operation by using a policy ID.
  • the RACF issues a policy to the home gateway, and can perform QoS control on the uplink packet passing through the home gateway before the BRAS, and provides an effective QoS guarantee for the uplink packet before the BRAS.
  • the problem that the metro network convergence layer is heavily loaded in the prior art is also solved.
  • FIG. 1 is an architectural diagram of the ITU-T resource admission control subsystem RACF
  • FIG. 2 is a schematic diagram of a RACF control DSL access network in the prior art
  • FIG. 3 is a schematic diagram of a RACF control home gateway in the present invention.
  • FIG. 4 is a schematic diagram of a process for triggering a RACF to send a policy to a home gateway when a user goes online;
  • FIG. 5 is a schematic diagram of a process for a RACF to send a policy to a home gateway when a user requests a service according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of networking in the case where a home gateway accesses a DSLAM in the present invention. Preferred embodiment of the invention
  • the policy control system of the present invention adds an HPE-FE to the home gateway.
  • the logical function entity implements the policy execution function.
  • the HPE-FE receives the policy from the RACF through the Rh interface.
  • the HPE-FE is based on the RACF.
  • the delivered policy or its statically configured policy controls the uplink packets passing through the home gateway to implement QoS control of the upstream packets before the BRAS.
  • the PE-FE of the BRAS performs policy enforcement on the downlink traffic passing through the BRAS according to the delivered policy, and the uplink traffic of the BRAS can be re-executed or not executed, and only the check or no processing is performed. .
  • the RACF dynamically generates the policy and sends it to the home gateway and the IP BFD device BRAS, including the policy generation and delivery when the user goes online and initiates the resource request: 1.
  • the process of triggering the RACF to send the policy to the home gateway when the user goes online When a user goes online, the identity authentication interaction is performed first. When the user identity is confirmed, the RACF needs to be notified to generate an initial policy for the user. Execute to the transport layer policy enforcement entity (including HPE-FE on the home gateway). The specific process is shown in Figure 4:
  • the PD-FE receives the notification that the user goes online
  • the user online notification may be notified by the IP boundary point device such as the BRAS to the PD-FE, or may be notified by the NACF port AAA server (Authentication, Authorization, and Accounting, authentication, authorization, accounting server)
  • the NACF informs the PD-FE user to go online
  • the user subscription information may be sent to the PD-FE together in the notification message;
  • the PD-FE checks whether the user has the subscription information in the notification message. If there is no subscription information of the user, the PD-FE interacts with the NACF to obtain the subscription information of the user.
  • the PD-FE checks, according to the QoS-related information in the subscription information of the user, the TRC-FE, and checks whether the current resource usage condition satisfies the user to generate an initial policy.
  • the PD-FE delivers the initial policy to the HPE-FE and PE-FE respectively;
  • HPE-FE and PE-FE respectively reply to the PD-FE with a response to the delivery policy.
  • the RACF processes the policy for issuing the policy to the home gateway.
  • the QoS of the service is determined through negotiation of the service layer.
  • the service control layer initiates a resource request to the RACF according to the negotiated QoS, and the QoS policy generated by the RACF is sent to the transport layer.
  • the layer policy enforcement entity (including the HPE-FE on the home gateway) is executed. The specific process is shown in Figure 5:
  • the SCF initiates a resource request to the PD-FE according to the QoS negotiated by the service layer;
  • the PD-FE authorizes the request and makes a preliminary policy decision. If the PD-FE does not have the subscription information of the user, the PD-FE needs to obtain the interaction with the NACF.
  • the PD-FE requests the resource from the TRC-FE, and the TRC-FE determines the request according to the current resource status, and returns whether there are enough available resources; (504) The PD-FE makes a final admission policy decision based on resource availability;
  • HPE-FE and PE-FE respectively reply to the PD-FE with a response to the delivery policy
  • the PD-FE replies to the SCF with a resource request response.
  • the RACF is sent to the home gateway as a dynamically generated policy.
  • the HPE-FE itself can statically configure some policies, and the RACF can be enabled by the policy ID, such as activation and deactivation.
  • the HPE-FE After the RACF sends the policy to the HPE-FE on the home gateway, the HPE-FE performs policy control on the uplink information of the home gateway, for example, matching the passed uplink>3 ⁇ 4 text, and identifying the template in the policy. Matching packet flow; performing gating according to the content of the policy (opening or closing the door, that is, whether the packet flow is allowed to pass), limiting the uplink and downlink bandwidth of the packet flow, according to the uplink type and QoS of the home gateway access
  • the priority classifies the identified packet flow with the priority label supported by the uplink.
  • the uplink interface of the home gateway is an ATM (Asynchronous Transfer Mode) port, which accesses the DSLAM (Digital Subscriber Line Access Multiplexer) through the ATM, and the DSLAM passes through a The Layer 2 Ethernet aggregation network (composed of some switches) is connected to the BRAS.
  • ATM Asynchronous Transfer Mode
  • the networking is shown in Figure 6.
  • the home gateway and the DSLAM establish several PVCs (Permanent Virtual Channels) that correspond to different QoS levels, such as constant bit rate, variable bit rate, and indeterminate bit rate. aisle) .
  • PVCs Permanent Virtual Channels
  • the home gateway filters the received uplink packets according to the delivered policy, and identifies the service flows that match the packet templates in the policy.
  • the home gateway accesses the packets to the PVC channel of the corresponding QoS level according to the QoS description in the policy.
  • the DSLAM puts the corresponding priority in the VLAN tag of the packets in the channel according to the QoS class of the PVC channel.
  • the latter Layer 2 device forwards the "3 ⁇ 4 text" according to the priority, guaranteeing its QoS.
  • the BRAS because it has the function of PE-FE, for the uplink packet, the BRAS can put the corresponding priority in the IP header of the packet according to the policy; or the priority in the IP header can also be identified by the home gateway. BRAS only does a check or does not process it.
  • the home gateway is equivalent to directly accessing the Layer 2 Ethernet aggregation network and accessing the BRAS through aggregation.
  • the home gateway will directly assign the corresponding priority to the VLAN tag of the corresponding uplink packet according to the policy.
  • the Ethernet switch in the Layer 2 Ethernet aggregation network forwards the packet according to the priority to ensure its QoS. .
  • the BRAS can put the corresponding priority in the IP header of the packet according to the policy, or the priority in the IP header can also be identified by the home gateway. BRAS only does a check or does not process it.
  • the corresponding home gateway policy control system is connected to the layer 2 aggregation network and the service access server, and includes a resource admission control function entity and a home gateway, wherein the home gateway includes a home policy enforcement function entity, where: a resource admission control function entity, configured to send a policy to the home policy enforcement function entity and the service access server;
  • the home policy enforcement function entity after receiving the policy, performs policy execution on the uplink message of the home gateway, including:
  • An identification module configured to identify, according to the service flow template in the policy content, an uplink message that passes through the home gateway, and if the identification succeeds, send the message to the QoS execution module;
  • a static policy configuration module configured to statically configure a policy, which is activated and deactivated by a resource admission control function by using a policy ID;
  • a QoS execution module configured to gate the packet flow, limit the uplink bandwidth of the packet flow, perform uplink on the packet flow according to the type of the uplink accessed by the home gateway, and the QoS priority Supported QoS priority processing.
  • the home gateway can access the industry through a digital subscriber access multiplexer or Ethernet switch. Access the server.
  • the RACF issues a policy to the home gateway, and can perform QoS control on the uplink packet passing through the home gateway before the BRAS, and provides an effective QoS guarantee for the uplink packet before the BRAS.
  • the problem that the metro network convergence layer is heavily loaded in the prior art is also solved.

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  • Computer Networks & Wireless Communication (AREA)
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Description

一种家庭网关策略控制方法及系统
技术领域
本发明涉及通信领域，更具体地涉及一种 NGN( Next Generation Network, 下一代网络） 中家庭网关策略控制方法及系统。
背景技术
NGN 中由于承载网釆用了分组技术， 特别是 IP技术， 使得其在 QoS ( Quality of Service , 服务质量） 方面的问题尤其突出。 ITU ( International Telecommunication Union, 国际电信联盟）提出了釆用 RACF ( Resource and Admission Control Function, 资源接纳控制功能）来解决 NGN承载网的 QoS 问题。
RACF的主要功能是基于运营策略规则， 根据用户签约 QoS信息和网络 内部可用资源进行资源接纳控制。 它对应用层屏蔽了承载层的差异， 将应用 层的 QoS属性映射到承载层， 使得承载层传输实体在其指导下能够为会话的 媒体流提供 QoS保障。
在 ITU最新的 RACF草案中， ITU-T (国际电信联盟远程通信标准化组 ) 的 RACF的功能架构如图 1所示， 其中：
PD-FE ( Policy Decision Function Entity, 策略决策功能实体）会基于通过 Rs接口从 SCF ( Service Control Function, 业务控制功能实体）获取的媒体流 会话信息、 通过 Ru接口从 NACF ( Network Attachment Control Function, 网 络附属控制功能实体）获取的用户的传输资源签约信息做出初步的 QoS资源 决策， 然后与 TRC-FE ( Transport Resource Control Function Entity, 传输资源 控制功能实体）交互以确认是否有足够的 QoS资源，最后做出一个最终决策， 并将该最终决策下发给 PE-FE ( Policy Execute Function Entity, 策略执行功能 实体 )执行。
TRC-FE主要负责资源控制， 它监控网络中的资源并收集相关信息， 在 PD-FE请求资源时根据具体的资源状况给予应答。 PE-FE主要是在 PD-FE在指导下进行策略控制 （门控、 带宽、 流量分类 和标记、 流量整形、 二层和三层 QoS映射、 收集和报告资源使用信息等） 。
TRE-FE ( Transport Resource Execute Function Entity, 传输资源执行功能 实体）协议， 目前的说明是在 TRC-FE指导下进行与传输技术相关的二层的 策略执行， 但是具体的功能和范围都没有确定。
由于用户的业务流在网络上会经过一些不同的子网段， 为了保证端到端 的 QoS, RACF在根据业务流的资源请求做出策略决策后， 需要把策略下发 到这些子网段的边界点上的策略执行功能上， 由策略执行功能根据策略对相 应的流量打上该网段的 QoS优先级标记或标签， 保证其在该网段中的 QoS。
图 2是在 DSL接入网中进行策略控制的示意图，以 DSL (数字用户线路， Digital Subscriber Line )接入网为例， 用户设备 CPE/CPN通过 DSL方式接入 时， RACF 根据资源请求生成控制策略， 下发到 IP 边界点设备 BRAS ( Bandwidth Remote Access Server, 宽带远程接入服务器）， 由 BRAS进行策 略执行， 另外对于一些大客户也可能是用 SR ( Service Router, 业务路由器）。
策略的主要内容包括业务流模板和 QoS信息， QoS信息包括： 门控、 上 下行流量带宽、 QoS优先级等。
业务流模板（如 IP五元组， 即 ^艮文协议、 源地址、 目标地址、 源端口、 目标端口 )是用于对经过的报文进行匹配， 如果匹配成功则对其执行策略中 描述的 QoS控制。
QoS优先级是描述该业务流的服务优先级的， 在不同的传输层网段会有 不同的映射， 映射后的优先级取值会设置在报文首部标识业务优先级的字段 中， 如 IP首部的 DSCP ( DiffServ Code Point, 差分服务编码点 )字段、 VLAN ( Virtual Local Area Network, 虚拟局域网）标签中的 Priority字段、 MPLS ( Multi protocol Label Switching Architecture ,多协议标签交换架构 )标签中的 CoS ( Class of Service, 服务类别）字段等， 传输层实体会根据相应的首部中 的优先级进行转发， 以保证报文流的时延。
上行带宽是该业务数据流允许的最大上行流带宽； 下行带宽是该业务数 据流允许的最大下行流带宽。
门控是指是否允许某种业务流通过， 在用户初始上线时， RACF可以根 据用户签约的业务为其下发一些门控， 后续用户还可以通过动态申请更新门 控。
BRAS进行策略执行时， 当用户的上行流量经过 BRAS时， BRAS根据 策略中的报文模板（如 IP五元组）进行识别， 如果能够匹配， 则根据策略中 的 QoS信息为该"¾文的 IP首部打上相应的 QoS优先级标签， 后面的 IP设备 就会根据该优先级标签保证该"^艮文的 QoS;当用户的下行流量经过 BRAS时， BRAS会根据策略对下行流量做类似处理，即根据策略对其二层首部如 VLAN Tag ( VLAN标签）打 QoS优先级标签， 下行方向上的二层设备会根据标签 保证其 QoS。
就目前运营商的运营现状来看， 其城域网汇聚层， 即从连接用户的第一 台局端设备到业务接入服务器（BRAS/SR ) 的负载较重， 因此， 尤其需要对 这一段网络提供有效的 QoS保证。 但是目前的 RACF控制方式只能对汇聚层 下行的报文进行有效的 QoS控制， 上行的报文只是在到了 BRAS之后才能进 行 QoS控制， 这是不完善的。 因此， 有必要从汇聚层的上下入口处进行 QoS 控制。
另一方面， 近年来， 固网运营商来自话音、 纯宽带业务收入的增幅在不 断下降， 鉴于竟争和需求的变化， 固网运营商需要从纯数据、 话音的单业务 运营走向应用、 视频、 语音、 数据结合的多业务运营， 以便留住和吸引更多 的家庭用户。 从技术和产品的角度来看， 就需要能支持多业务、 多种端口、 区分不同业务质量的终端产品， 也就是家庭网关。 而家庭网关的 QoS控制问 题则是运营商发展数字家庭业务的关键所在。
发明内容
本发明要解决的技术问题是提供一种家庭网关策略控制方法及系统， 解 决现有技术中城域网汇聚层负载较重，难以对上行报文进行有效的 QoS控制 的问题。
为了解决上述问题， 本发明提供了一种家庭网关策略控制方法， 资源接 纳控制功能实体向家庭网关下发策略， 家庭网关根据接收到的所述策略对经 过家庭网关的上行报文进行策略执行。
进一步地， 所述策略的内容至少包括业务流模板和 QoS信息， QoS信息 包括： 门控、 上下行流量带宽、 QoS优先级；
家庭网关根据所述业务流模板对经过家庭网关的上行报文进行识别， 对 识别出的报文流根据策略进行如下操作：
( 1 ) 执行门控； 或
( 2 ) 限制其上下行带宽； 或
( 3 ) 根据该家庭网关接入的上行链路的类型以及所述 QoS优先级对识 别出的报文流进行其上行链路支持的 QoS优先级处理。
进一步地， 家庭网关接入的上行链路的类型为数字用户接入复用器时， 将家庭网关与数字用户接入复用器之间的多条永久虚通道分别与所述 QoS优 先级的不同 QoS级别相对应；
家庭网关根据所述 QoS优先级将所述上行报文接入相应 QoS级别的永久 虚通道；
数字用户接入复用器根据永久虚通道的 QoS 级别， 将通道中的报文的 VLAN标签， 或同时在 VLAN标签和 IP首部中打上相应的优先级标记。
进一步地， 家庭网关接入的上行链路的类型为以太交换机时， 家庭网关 根据策略内容将所述上行报文相应的业务流的 VLAN标签， 或同时在 VLAN 标签和 IP首部中打上对应的 QoS优先级标记。
进一步地， 所述家庭网关上配置有静态策略， 所述静态策略由资源接纳 控制功能通过策略 ID进行激活和去激活操作。
本发明还提供了一种家庭网关策略控制系统， 该系统与二层汇聚网和业 务接入服务器相连接， 包括资源接纳控制功能实体和家庭网关， 所述家庭网 关包括家庭策略执行功能实体， 其中： 资源接纳控制功能实体， 用于向所述家庭策略执行功能实体和所述业务 接入服务器下发策略；
所述家庭策略执行功能实体， 用于接收到所述策略后， 对经过家庭网关 的上行报文进行策略执行。
进一步地， 所述家庭策略执行功能实体包括：
识别模块， 用于根据所述策略内容中的业务流模板对经过家庭网关的上 行报文进行识别， 如果识别成功则发送给 QoS执行模块；
QoS执行模块， 用于对报文流进行门控、 限制报文流的上行行带宽、 根 据家庭网关接入的上行链路的类型以及所述 QoS优先级对该报文流进行其上 行链路支持的 QoS优先级处理。
进一步地， 所述系统包括数字用户接入复用器， 所述家庭网关接入数字 用户接入复用器， 所述数字用户接入复用器通过二层汇聚网接入所述业务接 入服务器， 且家庭网关与数字用户接入复用器之间的多条永久虚通道分别与 所述 QoS优先级的不同 QoS级别相对应；
所述 QoS执行模块根据所述 QoS优先级将所述上行报文接入相应 QoS 级别的永久虚通道；
数字用户接入复用器根据永久虚通道的 QoS 级别， 将通道中的报文的 VLAN标签， 或同时在 VLAN标签和 IP首部中打上相应的优先级标记。
进一步地， 所述家庭网关接入以太交换机， 通过二层汇聚网直接接入所 述业务接入服务器；
所述 QoS执行模块根据策略内容将所述上行报文相应的业务流的 VLAN 标签， 或同时在 VLAN标签和 IP首部中打上对应的 QoS优先级标记。
进一步地， 所述家庭策略执行功能实体包括静态策略配置模块， 用于静 态配置策略， 其由资源接纳控制功能通过策略 ID进行激活和去激活操作。
釆用本发明的策略控制方法和系统， 由 RACF向家庭网关下发策略， 可 以在 BRAS之前对经过家庭网关的上行报文进行 QoS控制， 对于上行的报文 在 BRAS之前提供了有效的 QoS保证， 同时也解决了现有技术中城域网汇聚 层负载较重的问题。 附图概述
图 1为 ITU-T的资源接纳控制子系统 RACF的架构图； 。
图 2为现有技术中 RACF控制 DSL接入网的示意图；
图 3为本发明中 RACF控制家庭网关的示意图；
图 4为本发明实施例用户上线时触发 RACF对家庭网关下发策略的流程 示意图；
图 5为本发明实施例用户请求业务时 RACF对家庭网关下发策略的流程 示意图；
图 6为本发明中家庭网关接入 DSLAM情况下的组网示意图。 本发明的较佳实施方式
下面结合附图和具体实施例对本发明作进一步详细的说明， 但并不作为 对本发明的限制。
如图 3 所示， 本发明的策略控制系统是在家庭网关上增设一 HPE-FE
( Home Policy Execute Function Entity, 家庭策略执行功能实体）逻辑功能实 体来实现策略执行功能 , HPE-FE通过 Rh接口从 RACF接收策略 , 当用户设 备 UE通过家庭网关 HG请求业务时， HPE-FE根据 RACF下发的策略或其自 身静态配置的策略对经过家庭网关的上行报文进行策略控制， 实现了在 BRAS之前对上行报文的 QoS控制。
BRAS的 PE-FE根据下发的策略对经过 BRAS的下行流量进行策略执行， 而对经过 BRAS的上行流量既可以重新进行策略执行， 也可以不进行策略的 执行， 只做一下检查或不做处理。
本实施例的策略控制方法包括：
RACF动态生成策略并下发到家庭网关及 IP边界点设备 BRAS, 包括用 户上线时和发起资源请求时的策略生成和下发： 1、 用户上线时触发 RACF对家庭网关下发策略的处理流程 当一个用户上线时， 首先会进行身份认证交互， 在确认用户身份合法时， 需要通知 RACF对该用户生成一个初始策略， 并下发给传输层策略执行实体 (包括家庭网关上的 HPE-FE )执行， 具体流程如图 4所示：
( 401 ) PD-FE收到用户上线的通知；
该用户上线通知可以由 IP边界点设备如 BRAS对 PD-FE进行通知，也可 以由 NACF 口 AAA月良务器 ( Authentication, Authorization, and Accounting, 鉴 权、 授权、 记账服务器 )进行通知， 由 NACF通知 PD-FE用户上线时， 可以 在通知消息中将用户签约信息一起发给 PD-FE;
( 402 ) PD-FE检查通知消息中是否有用户的签约信息， 如果没有用户的 签约信息， 那么 PD-FE会与 NACF交互， 获取该用户的签约信息；
( 403 ) PD-FE根据该用户的签约信息中的 QoS相关信息， 同时， 还会 向 TRC-FE检查当前的资源使用情况是否都满足该用户， 以生成一个初始策 略；
( 404a, b ) PD-FE将初始策略分别下发给 HPE-FE和 PE-FE;
( 405a, b ) HPE-FE和 PE-FE分别向 PD-FE回复下发策略的应答。
2、 用户请求业务时 RACF对家庭网关下发策略的处理流程
当用户希望动态发起一个有 QoS保证的业务时， 会通过业务层的协商确 定该业务的 QoS, 业务控制层根据协商的 QoS向 RACF发起资源请求， 由 RACF生成传输层的 QoS策略下发给传输层策略执行实体（包括家庭网关上 的 HPE-FE )执行， 具体流程如图 5所示：
( 501 ) SCF根据业务层协商的 QoS向 PD-FE发起资源请求；
( 502 ) PD-FE对请求进行授权， 并做出初步的策略决策， 如果 PD-FE 没有该用户的签约信息， 则需要与 NACF交互获取；
( 503 ) PD-FE向 TRC-FE请求资源 , TRC-FE根据当前资源状况对请求 做出判断， 返回是否有足够的可用资源； ( 504 ) PD-FE根据资源可用性做出最终的接纳策略决策；
( 505a, b ) PD-FE分别向 HPE-FE和 PE-FE下发策略；
( 506a, b ) HPE-FE和 PE-FE分别向 PD-FE回复下发策略的应答；
( 507 ) PD-FE向 SCF回复资源请求应答。
上述步骤中 RACF下发到家庭网关上的是动态生成的策略， 但 HPE-FE 本身也可以静态配置一些策略，并可由 RACF通过策略 ID来对其进行使能操 作， 如激活、 去激活操作。
RACF向家庭网关上的 HPE-FE下发策略后 , HPE-FE对经过家庭网关的 上行 ^艮文进行策略控制， 如对经过的上行>¾文进行匹配， 识别出与策略中才艮 文模板匹配的报文流； 根据策略的内容执行进行门控（开门或者关门， 即是 否允许报文流通过） ， 限制报文流的上下行带宽， 根据家庭网关接入的上行 链路的类型以及 QoS优先级对识别出的报文流打上该上行链路支持的优先级 标签等操作。
下面以两种最常见的接入网方式介绍 HPE-FE进行策略控制的流程。 a ) 家庭网关接入 DSLAM
在这种情况下， 家庭网关的上行接口是 ATM ( Asynchronous Transfer Mode, 异步传输模式）口， 它通过 ATM接入 DSLAM ( Digital Subscriber Line Access Multiplexer, 数字用户接入复用器）， DSLAM再通过一个二层以太汇 聚网 （由一些交换机组成）接入 BRAS, 组网如图 6所示。
这种组网模式下， 家庭网关会与 DSLAM之间建立几条对应不同 QoS级 另 'K如：恒定比特率、可变比特率、不确定比特率等）的 PVC ( Permanent Virtual Channel, 永久虚通道） 。
家庭网关根据下发的策略对经过的上行报文进行过滤， 识别出与策略中 报文模板匹配的业务流， 家庭网关根据策略中的 QoS描述将报文接入相应 QoS级别的 PVC通道。 DSLAM则才艮据 PVC通道的 QoS级别， 将通道中的 报文的 VLAN标签中打上相应的优先级。 后面的二层设备则根据该优先级转 发"¾文， 保证其 QoS。 对于 BRAS来说，由于它具备 PE-FE的功能，对于上行报文，可以由 BRAS 根据策略在报文的 IP首部打上相应的优先级； 或者， IP首部中的优先级也可 以由家庭网关标识， BRAS只做一下检查或不做处理。
b ) 家庭网关接入以太交换机
在这种情况下， 家庭网关相当于直接接入二层以太汇聚网， 通过汇聚接 入 BRAS。
这种组网模式下， 家庭网关将直接根据策略对相应的上行报文流的 VLAN标签中打上相应的优先级， 二层以太汇聚网中的以太交换机根据该优 先级转发报文， 保证其 QoS。
对于 BRAS来说，由于它具备 PE-FE的功能，对于上行报文，可以由 BRAS 根据策略在报文的 IP首部打上相应的优先级， 或者 IP首部中的优先级也可 以由家庭网关标识， BRAS只做一下检查或不做处理。
为了实现以上家庭网关策略控制方法， 与之对应的家庭网关策略控制系 统与二层汇聚网和业务接入服务器相连接， 包括资源接纳控制功能实体和家 庭网关， 其特征在于， 所述家庭网关包括家庭策略执行功能实体， 其中： 资源接纳控制功能实体， 用于向所述家庭策略执行功能实体和所述业务 接入服务器下发策略；
家庭策略执行功能实体， 用于接收到所述策略后， 对经过家庭网关的上 行报文进行策略执行， 包括：
识别模块， 用于根据所述策略内容中的业务流模板对经过家庭网关的上 行报文进行识别， 如果识别成功则发送给 QoS执行模块；
静态策略配置模块， 用于静态配置策略， 其由资源接纳控制功能通过策 略 ID进行激活和去激活操作；
QoS执行模块， 用于对报文流进行门控、 限制报文流的上行行带宽、 根 据家庭网关接入的上行链路的类型以及所述 QoS优先级对该报文流进行其上 行链路支持的 QoS优先级处理。
如上所述， 家庭网关可以通过数字用户接入复用器或以太交换机接入业 务接入服务器。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及实质地情 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
釆用本发明的策略控制方法和系统， 由 RACF向家庭网关下发策略， 可 以在 BRAS之前对经过家庭网关的上行报文进行 QoS控制， 对于上行的报文 在 BRAS之前提供了有效的 QoS保证， 同时也解决了现有技术中城域网汇聚 层负载较重的问题。

Claims

权 利 要 求 书
1、 一种家庭网关策略控制方法，其特征在于， 资源接纳控制功能实体向 家庭网关下发策略， 家庭网关根据接收到的所述策略对经过家庭网关的上行 报文进行策略执行。 2、 如权利要求 1所述的方法， 其特征在于，
所述策略的内容至少包括业务流模板和 QoS信息， QoS信息包括： 门控、 上下行流量带宽、 QoS优先级；
家庭网关根据所述业务流模板对经过家庭网关的上行报文进行识别， 对 识别出的报文流根据策略进行如下操作：
( 1 ) 执行门控； 或
( 2 ) 限制其上下行带宽； 或
( 3 ) 根据该家庭网关接入的上行链路的类型以及所述 QoS优先级对识 别出的报文流进行其上行链路支持的 QoS优先级处理。
3、 如权利要求 2所述的方法， 其特征在于，
家庭网关接入的上行链路的类型为数字用户接入复用器时， 将家庭网关 与数字用户接入复用器之间的多条永久虚通道分别与所述 QoS优先级的不同 QoS级别相对应；
家庭网关根据所述 QoS优先级将所述上行报文接入相应 QoS级别的永久 虚通道；
数字用户接入复用器根据永久虚通道的 QoS级别， 将通道中的报文的虚 拟局域网 VLAN标签， 或同时在 VLAN标签和 IP首部中打上相应的优先级 标记。
4、 如权利要求 1或 2所述的方法， 其特征在于，
家庭网关接入的上行链路的类型为以太交换机时， 家庭网关根据策略内 容将所述上行报文相应的业务流的 VLAN标签， 或同时在 VLAN标签和 IP 首部中打上对应的 QoS优先级标记。
5、 如权利要求 1所述的方法， 其特征在于，
所述家庭网关上配置有静态策略， 所述静态策略由资源接纳控制功能通 过策略 ID进行激活和去激活操作。
6、 一种家庭网关策略控制系统，该系统与二层汇聚网和业务接入服务器 相连接， 包括资源接纳控制功能实体和家庭网关， 其特征在于， 所述家庭网 关包括家庭策略执行功能实体， 其中：
资源接纳控制功能实体， 用于向所述家庭策略执行功能实体和所述业务 接入服务器下发策略；
所述家庭策略执行功能实体， 用于接收到所述策略后， 对经过家庭网关 的上行报文进行策略执行。
7、 如权利要求 6所述的系统，其特征在于， 所述家庭策略执行功能实体 包括：
识别模块， 用于根据所述策略内容中的业务流模板对经过家庭网关的上 行报文进行识别， 如果识别成功则发送给 QoS执行模块；
QoS执行模块， 用于对报文流进行门控、 限制报文流的上行行带宽、 根 据家庭网关接入的上行链路的类型以及所述 QoS优先级对该报文流进行其上 行链路支持的 QoS优先级处理。
8、 如权利要求 7所述的系统， 其特征在于，
所述系统包括数字用户接入复用器， 所述家庭网关接入数字用户接入复 用器， 所述数字用户接入复用器通过二层汇聚网接入所述业务接入服务器， 且家庭网关与数字用户接入复用器之间的多条永久虚通道分别与所述 QoS优 先级的不同 QoS级别相对应；
所述 QoS执行模块根据所述 QoS优先级将所述上行报文接入相应 QoS 级别的永久虚通道；
数字用户接入复用器根据永久虚通道的 QoS 级别， 将通道中的报文的
VLAN标签， 或同时在 VLAN标签和 IP首部中打上相应的优先级标记。
9、 如权利要求 7所述的系统， 其特征在于，
所述家庭网关接入以太交换机， 通过二层汇聚网直接接入所述业务接入 服务器；
所述 QoS执行模块根据策略内容将所述上行报文相应的业务流的 VLAN 标签， 或同时在 VLAN标签和 IP首部中打上对应的 QoS优先级标记。
10、 如权利要求 6所述的系统， 其特征在于，
所述家庭策略执行功能实体包括静态策略配置模块，用于静态配置策略， 其由资源接纳控制功能通过策略 ID进行激活和去激活操作。
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