WO2009062449A1 - A control method, device and system for multicast access in passive optical network - Google Patents

A control method, device and system for multicast access in passive optical network Download PDF

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Publication number
WO2009062449A1
WO2009062449A1 PCT/CN2008/073054 CN2008073054W WO2009062449A1 WO 2009062449 A1 WO2009062449 A1 WO 2009062449A1 CN 2008073054 W CN2008073054 W CN 2008073054W WO 2009062449 A1 WO2009062449 A1 WO 2009062449A1
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Prior art keywords
multicast
optical network
optical
access
ont
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PCT/CN2008/073054
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English (en)
French (fr)
Inventor
Zhijun Qu
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to ES08849167.5T priority Critical patent/ES2625480T3/es
Priority to EP08849167.5A priority patent/EP2091187B1/en
Publication of WO2009062449A1 publication Critical patent/WO2009062449A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • 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]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2858—Access network architectures
    • H04L12/2861—Point-to-multipoint connection from the data network to the subscribers
    • 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]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/287—Remote access server, e.g. BRAS
    • 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]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/287—Remote access server, e.g. BRAS
    • H04L12/2874—Processing of data for distribution to the subscribers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables

Definitions

  • the present invention relates to the field of passive optical network technologies, and in particular, to a control method, device and system for passive optical network multicast access.
  • Passive Optical Network is an optical access technology that uses a point-to-multipoint topology. As shown in Figure 1, the Optical Line Terminal (OLT) and users are located on the central side. The optical network terminal (ONT) and the optical distribution network (ODN) are combined. The so-called “passive” means that the ODN does not contain any active electronic devices and electronic power supplies, all of which consist of optical fibers and passive optical components such as splitters/combiners.
  • ODN divides one fiber into multiple channels, and the ONT shares bandwidth.
  • the time division multiple access (TDMA) is used to implement the access.
  • Each ONT can only send its own uplink data in the time slot specified by the OLT.
  • the downlink service is from the OLT to the ONT, it is transmitted to each ONT information data by means of Time Division Multiplexing (TDM) broadcast, and a specific identifier is used to indicate which ONT each time slot belongs to, and each ONT is based on the corresponding Identify to pick out your own business flow.
  • TDM Time Division Multiplexing
  • the specific identifier may be: a virtual channel identifier (VPI) value for an ATM passive optical network (APON), a logical link identifier (LLID) for an Ethernet passive optical network (EPON), a gigabit-free Source Optical Network (GPON) uses Gigabit Passive Optical Network Encapsulation Pipeline Identification (GEM port ID).
  • VPN virtual channel identifier
  • APON ATM passive optical network
  • LLID logical link identifier
  • EPON Ethernet passive optical network
  • GEM port ID uses Gigabit Passive Optical Network Encapsulation Pipeline Identification
  • the mechanism of PON passive point-to-multipoint structure and downlink physical layer broadcast transmission makes it very suitable for carrying multicast type services (such as IPTV).
  • multicast type services such as IPTV.
  • multicast access control is implemented by controlling the number of upstream ONT access multicast requests.
  • the downlink bandwidth of the PON terminal user is shared. Therefore, under one PON interface, any ONT applies for the program, and the OLT forwards the program through the PON interface, simply relying on controlling the number of ONT access multicast requests of the uplink.
  • the enrollment may cause the downlink bandwidth to be completely occupied by multicast, thus affecting the provision of other services.
  • the technical problem to be solved by the embodiments of the present invention is to provide a control method, device and system for passive optical network multicast access, and overcome the existing passive optical network multicast access control, which may cause all downlink bandwidth to be The disadvantage of multicast occupation and other services.
  • an embodiment of the present invention provides a control method for a passive optical network multicast access, including: a passive optical network multicast access control method, which is characterized in that, at an optical line terminal OLT A multicast access control table is configured, and a multicast forwarding table is configured to forward the multicast data.
  • the optical network terminal ONT is configured with a multicast filtering table for receiving multicast data, where the method includes: the OLT receiving the ONT Sending a multicast program access request; the OLT determines, according to the multicast access control information, whether the optical network terminal is allowed to access the requested multicast program, and if so, refreshes its own multicast forwarding table, and Notifying the ONT to refresh the multicast filtering table; the OLT receives the multicast data sent by the multicast source, and forwards the multicast data according to the updated multicast forwarding table.
  • An embodiment of the present invention provides a passive optical network optical line terminal, including: a network interface, configured to interconnect with an IP network, and receive multicast data from a multicast source; and an optical interface, configured to be connected to the optical distribution network, and receive a multicast program access request sent by the optical network terminal, forwarding the multicast data of the multicast program requested by the optical network terminal to the optical network terminal; and a forwarding unit, configured to group the multicast source according to the multicast forwarding table
  • the broadcast data is forwarded to the corresponding optical interface; the storage unit is configured to store the configured multicast access control information; and the control unit is configured to determine, according to the multicast access control information, whether the optical network terminal is allowed to access the request
  • the multicast program if it is determined to be enabled, refreshes its own multicast forwarding table and notifies the ONT to refresh the multicast filtering table on the ONT.
  • An embodiment of the present invention provides a passive optical network system, including an optical line terminal and an optical network terminal, where the optical line terminal is interconnected with an IP network and connected to an optical network terminal through an optical distribution network; Transmitting the multicast data according to the multicast forwarding table configured on the network; the optical network terminal is configured to receive the multicast data according to the multicast filtering table configured on the optical network terminal, where the optical line terminal receives the optical network.
  • the multicast program access request sent by the terminal determines, according to the multicast access control information configured thereon, whether the optical network terminal is allowed to access the requested multicast program, and if it is determined to be enabled, refreshes its own multicast forwarding table, and The ONT is notified to refresh the multicast filter table on the ONT.
  • the optical line The terminal performs passive optical network multicast access control according to the multicast access control information.
  • the passive optical network multicast access control is implemented by controlling the number of uplink optical network terminal access multicast requests, and in the present invention, the optical line terminal controls the multicast access according to the multicast access control information, thereby avoiding The downlink bandwidth is all occupied by multicast, thus ensuring normal transmission of other services.
  • FIG. 1 is a schematic structural diagram of a passive optical network in the background art
  • FIG. 2 is a schematic diagram of a method for controlling multicast access of a passive optical network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a system for controlling multicast access of a passive optical network according to Embodiment 2 of the present invention.
  • Embodiments of the present invention provide a method, a device, and a system for controlling a multicast optical network multicast access.
  • the optical line terminal supports a multicast service, a multicast management protocol, and a multicast control, and the optical network terminal supports the multicast service. And processing functions such as multicast management protocols.
  • the optical network terminal sends a multicast program access request to the optical line terminal, and the optical line terminal processes the multicast program access request. When access is allowed, the optical network terminal receives the multicast stream forwarded by the optical line terminal.
  • FIG. 2 is a flow chart diagram of a method for controlling multicast optical network multicast access according to Embodiment 1 of the present invention.
  • Step 101 Configure multicast access control information on the optical line terminal.
  • the multicast access control information includes a multicast bandwidth of the multicast source (a bandwidth that the multicast program needs to occupy, which may include a maximum bandwidth and an average bandwidth), and an optical interface (an interface connected to the optical distribution network) of the optical line terminal. Maximum multicast bandwidth.
  • the multicast access control information may further include a maximum number of multicast programs that the optical network terminal connected by the optical line terminal can request.
  • the multicast access control information can be configured on the optical line terminal through the network management or the command line.
  • Step 102 The optical line terminal receives the multicast program access request sent by the optical network terminal.
  • the multicast program access request may be an Internet Group Management Protocol (IGMP Join) message, where the message includes the requested multicast program. IP address of the multicast source.
  • IGMP Join Internet Group Management Protocol
  • Step 103 The optical line terminal determines, according to the configured multicast access control information, whether the request group is allowed.
  • the optical network terminal accessed by the broadcast program accesses the multicast program;
  • the optical line terminal determines that the new bandwidth is allowed according to the bandwidth of the multicast source of the multicast program that is requested to be accessed. After the multicast program access request, the multicast bandwidth of the optical interface exceeds the configured maximum multicast bandwidth. If not, the optical line terminal allows the optical network terminal to access the multicast program; otherwise, the optical line terminal rejects the optical network terminal. Access to the multicast program.
  • the optical line terminal determines whether the multicast bandwidth of the optical interface exceeds the configured maximum multicast bandwidth and the optical network that requests multicast access, according to the bandwidth of the multicast source that is requested to access the new multicast program. Whether the number of multicast programs of the terminal exceeds the configured maximum number of multicast programs, if not exceeded, the optical line terminal allows the optical network terminal to access the multicast program; otherwise, the optical line terminal rejects the optical network terminal from accessing the multicast program. .
  • Step 104 If it is determined that the optical network terminal is allowed to access the multicast program, the optical line terminal forwards the multicast data of the multicast program (or the multicast stream of the multicast program) to the optical network terminal requesting access;
  • the terminal refreshes its own multicast forwarding table, and adds an optical network terminal requesting access in the user list corresponding to the multicast program in the multicast forwarding table, such as a user list corresponding to the multicast program in the multicast forwarding table. Add the optical network terminal identifier of the request access or the port ID of the optical network terminal.
  • the optical line terminal receives the multicast data of the multicast program sent by the multicast source, and forwards the multicast data of the multicast program to the optical network terminal requesting access according to the multicast forwarding table.
  • the optical line terminal may also notify the optical network terminal to refresh the multicast filtering table, so that the optical network terminal filters the received data according to the multicast filtering table to obtain the multicast data of the multicast program requested by itself.
  • the optical line terminal can notify the optical network terminal through the operation and maintenance management channel of the passive optical network system, that is, the notification message is carried in the operation and maintenance management frame and sent to the optical network terminal.
  • the optical line terminal notifies the optical network terminal to refresh the multicast filtering table through the OMCI multicast control frame of the OMCI (ONT management and control interface) channel; in the EPON, by running the management and maintenance channel
  • the multicast control frame notifies the optical network terminal to refresh the multicast filter table.
  • FIG. 3 is a schematic diagram of a system for controlling multicast access of a passive optical network according to Embodiment 2 of the present invention.
  • the system includes at least an optical line terminal 1 and an optical network terminal 2, and the optical network terminal 2 transmits a multicast program access request to the optical line terminal 1, and the optical line terminal 1 determines whether to allow the optical network terminal 2 according to the configured multicast access control information. Accessing the requested multicast program, if it is determined to be permitted, the optical line terminal 1 receives the multicast data of the multicast program sent by the multicast source 3, and forwards the multicast data of the multicast program to the optical network terminal 2.
  • the optical line terminal 1 includes a network interface 10, an optical interface 12, a storage unit 13, and a control unit 14.
  • the network interface 10 is for interconnecting the optical line terminal 1 with the IP network to receive multicast data from the multicast source 3.
  • the optical interface 12 is configured to connect the optical line terminal 1 to the optical distribution network, receive the multicast program access request sent by the optical network terminal 2, and transmit the multicast data of the multicast program requested by the illuminating network terminal 2 to the optical network terminal 2 .
  • the storage unit 13 is configured to store multicast access control information configured through a network management system or a command line.
  • the forwarding unit 11 is configured to forward the multicast data of the multicast source 3 from the network interface 10 to the corresponding optical interface 12 according to the multicast forwarding table.
  • the control unit 14 is configured to determine, according to the multicast access control information stored by the storage unit 13, whether the optical network terminal that requests the multicast program access is allowed to access the multicast program, and if it is determined to allow, the control network interface 10 receives the applied group.
  • the multicast data of the broadcast program, the control optical interface 12 forwards the multicast data of the applied multicast program to the optical network terminal that requests the multicast program access. Since the passive optical network is a point-to-multipoint system, the step of controlling the reception of the data of the multicast source and the effective forwarding of the multicast data is implemented by the cooperation of the optical line terminal 1 and the optical network terminal 2, that is, the optical line terminal can be passed.
  • the broadcast forwarding table forwards the multicast data, and the optical network terminal 2 can receive the multicast data according to the refreshed multicast filter table.
  • the process of refreshing the specific multicast forwarding table and the multicast filtering table can be referred to the above method, and is not mentioned.
  • the multicast access control information includes a combination of one or more of the following: a multicast bandwidth of the multicast source 3, a maximum multicast bandwidth of the optical interface 12 of the optical line terminal 1, and a maximum multicast program that the optical network terminal 2 can request.
  • the multicast bandwidth of the multicast source 3 is stored in the storage unit 13 in a manner corresponding to the identifier of the multicast source 3 (such as the IP address of the multicast source) and the multicast bandwidth of the multicast source 3.
  • the multicast access control information may further include the maximum number of multicast programs that the optical network terminal 2 connected to by the optical line terminal 1 can request, and the maximum number of multicast programs that the optical network terminal 2 can request is the identifier of the optical network terminal 2 and the optical network.
  • the maximum number of multicast programs that the terminal 2 can request - the corresponding manner is stored in the storage unit 13 in.
  • the memory unit 13 and the control unit 14 of the optical line terminal 1 can be integrated on one chip or implemented by one CPU.
  • the control unit 14 may send the notification that the refresh optical network terminal 2 refreshes the multicast filter table to the optical network terminal 2 through the operation and maintenance management channel, such as the OMCI channel of the GPON system or the OAM channel of the EPON system, so that the optical network terminal 2 is configured according to The indication in the notification refreshes the multicast filtering table on the optical network terminal 2.
  • the operation and maintenance management channel such as the OMCI channel of the GPON system or the OAM channel of the EPON system
  • the control unit 14 determines, according to the multicast access control information stored in the storage unit 13, whether the optical network terminal 2 that requests the multicast program access is allowed to access the multicast program, according to the multicast bandwidth of the multicast source 3, Determining whether the multicast bandwidth of the optical interface 21 exceeds the maximum multicast bandwidth and the number of multicast programs of the optical network terminal 2 exceeds the maximum number of multicast programs after the multicast program access request is permitted. If not, the optical network terminal 2 is allowed to access the requested multicast program; otherwise, the optical network terminal 2 is denied access to the requested multicast program.
  • the control unit 14 may be composed of a first determining unit, a second determining unit, and a determining unit, where: the first determining unit is configured to determine, according to the multicast bandwidth of the multicast source, that the multicast program is allowed to be connected. Whether the multicast bandwidth of the optical interface exceeds the maximum multicast bandwidth after the request is received; the second determining unit is configured to determine whether the number of multicast programs of the ONT exceeds the maximum number of multicast programs; a determining unit, configured to allow the ONT to access the requested multicast program when the determination result of the first determining unit and the second determining unit is not exceeded; otherwise, rejecting the ONT access request Multicast programs are based.
  • the optical network terminal 2 includes an optical interface 21 for connecting the optical network terminal to the optical distribution network 2, transmitting a multicast program access request to the optical line terminal 1, and receiving the group of the requested multicast program forwarded by the optical line terminal 1. Broadcast data
  • the multicast data filtering unit 22 is configured to receive multicast data belonging to the multicast program requested by the multicast filtering table according to the multicast filtering table.
  • the optical network terminal 2 can receive the notification of refreshing the multicast filtering table sent by the optical line terminal through the operation and maintenance management channel, such as the OMCI channel of the GPON system or the operation management and maintenance channel of the EPON system, and refresh the multicast data according to the indication in the notification.
  • the multicast filter table in the filtering unit 22 is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

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Description

一种无源光网络组播接入的控制方法、 设备和系统
本申请要求于 2007 年 11 月 16 日提交中国专利局、 申请号为 200710124640.3、 发明名称为"一种无源光网络组播接入的控制方法、 设备和 系统"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无源光网络技术领域，具体地说， 涉及一种无源光网络组播接 入的控制方法、 设备和系统。
背景技术
无源光网络 ( Passive Optical Network, PON )是一种采用点到多点拓朴结 构的光接入技术， 如图 1所示， 由局侧的光线路终端 （Optical Line Terminal, OLT )、 用户侧的光网络终端（ Optical Network Terminal , ONT )以及光分配网 络（ Optical Distribution Network, ODN )组成。 所谓"无源"， 是指 ODN中不 含有任何有源电子器件及电子电源， 全部由光纤和光分（Splitter ) /合路器 ( combiner )等无源光器件组成。
ODN把一路光纤分成多路， ONT共享带宽。 上行业务从 ONT到 OLT 时，为了避免发送冲突 ,采用时分多址（ Time Division Multiple Access , TDMA ) 方式实现接入， 每个 ONT只能在 OLT指定的时隙发送自己的上行数据。 下行 业务从 OLT到 ONT时， 是采用时分复用 （Time Division Multiplexing, TDM ) 广播的方式发送给各 ONT信息数据， 并用特定的标识来指示各时隙是属于哪 个 ONT的，各 ONT根据相应的标识来挑选出属于自己的业务流。所述特定的 标识可以是： ATM无源光网络（ APON )用虚通道标识（ VPI )值、 以太网无 源光网络（ EPON )用逻辑链路标识（ Logical Link Identifier, LLID )、 吉比特 无源光网络（GPON )用吉比特无源光网络封装方式管道标识（GEM port ID )。
PON无源点对多点结构、 下行物理层广播传输的机制使之非常适合承载 组播类型业务（如 IPTV )。 然而， 由于带宽是有限的， PON提供组播业务时， 需要对组播接入进行控制。 目前， 组播接入控制是依靠控制上行的 ONT接入 组播请求数目来实现的。 然而， PON终端用户的下行带宽是共享的， 所以在 一个 PON接口下，任何一个 ONT申请了节目， OLT都会把这个节目通过 PON 接口转发下去， 单纯地依靠控制上行的 ONT接入组播请求数目来控制组播接 入会导致下行带宽有可能全部被组播占用， 从而影响其它业务的提供。
发明内容
本发明实施例要解决的技术问题是：提供一种无源光网络组播接入的控制 方法、设备和系统，克服现有的无源光网络组播接入控制可能会导致下行带宽 全部被组播占用、 影响其他业务的缺点。
为解决上述技术问题，本发明实施例提供一种无源光网络组播接入的控制 方法， 包括： 一种无源光网络组播接入的控制方法， 其特征在于， 在光线路终 端 OLT上配置组播接入控制信息和配置有用于转发组播数据的组播转发表， 光网络终端 ONT上配置有用于接收组播数据的组播过滤表， 所述方法包括： 所述 OLT接收 ONT发送的组播节目接入请求； 所述 OLT根据所述组播接入 控制信息确定是否允许所述光网络终端接入请求的组播节目，如果允许， 则刷 新自身的组播转发表， 并通知 ONT刷新组播过滤表； 所述 OLT接收组播源发 送的组播数据， 根据刷新后的组播转发表转发所述组播数据。
本发明实施例提供一种无源光网络光线路终端， 包括： 网络接口， 用于与 IP网络互连， 接收来自组播源的组播数据； 光接口， 用于与光分配网络相连， 接收光网络终端发送的组播节目接入请求，转发所述光网络终端请求的组播节 目的组播数据至所述光网络终端； 转发单元， 用于根据组播转发表将组播源的 组播数据转发到相应的光接口；存储单元，用于存储配置的组播接入控制信息； 控制单元，用于根据所述组播接入控制信息确定是否允许所述光网络终端接入 请求的组播节目， 如果确定允许， 则刷新自身的组播转发表， 并通知 ONT刷 新 ONT上的组播过滤表。
本发明实施例提供一种无源光网络系统， 包括光线路终端和光网络终端， 所述光线路终端与 IP网络互连并通过光分配网络连接到光网络终端； 所述光 线路终端， 用于根据其上配置的组播转发表转发组播数据； 所述光网络终端， 用于根据其上配置的组播过滤表接收自身的组播数据； 其中， 所述光线路终端 接收所述光网络终端发送的组播节目接入请求，根据其上配置的组播接入控制 信息确定是否允许所述光网络终端接入请求的组播节目，如果确定允许，刷新 自身的组播转发表， 并通知 ONT刷新 ONT上的组播过滤表。
由上述本发明实施例提供的技术方案可以看出，本发明实施例中， 光线路 终端根据组播接入控制信息来进行无源光网络组播接入控制。现有技术中无源 光网络组播接入控制通过控制上行的光网络终端接入组播请求数目实现，而本 发明中光线路终端根据组播接入控制信息来控制组播接入，避免了下行带宽全 部被组播占用， 从而保证其他业务的正常传输。
附图说明
图 1为背景技术中无源光网络的结构示意图；
图 2为本发明实施例一控制无源光网络组播接入的方法示意图； 图 3为本发明实施例二控制无源光网络组播接入的系统示意图。
具体实施方式
本发明实施例提供一种无源光网络组播接入的控制方法、设备和系统， 光 线路终端支持组播业务、组播管理协议和组播控制等处理功能， 光网络终端支 持组播业务和组播管理协议等处理功能。光网络终端向光线路终端发送组播节 目接入请求， 光线路终端处理组播节目接入请求。 允许接入时， 光网络终端接 收光线路终端转发的组播流。
如图 2所示为本发明实施例一提供的无源光网络组播接入的控制方法的流 程图图。
本实施例控制无源光网络组播接入的具体步骤如下：
步骤 101 : 在光线路终端上配置组播接入控制信息；
所述组播接入控制信息包括组播源的组播带宽 （组播节目需要占用的带 宽， 可以包括最大带宽和平均带宽）、 光线路终端的光接口 （与光分配网络相 连的接口） 的最大组播带宽。
所述组播接入控制信息还可以包括光线路终端连接的光网络终端可请求 的最大组播节目数。
需要说明的是，可以通过网管或命令行将组播接入控制信息配置到光线路 终端上。
步骤 102: 光线路终端接收光网络终端发送的组播节目接入请求； 该组播节目接入请求可以是因特网组管理协议加入（IGMP Join ) 文， 该报文中包含所请求的组播节目的组播源的 IP地址。
步骤 103: 光线路终端根据配置的组播接入控制信息确定是否允许请求组 播节目接入的光网络终端接入该组播节目；
当组播接入控制信息包括组播源的组播带宽和光线路终端的光接口的最 大组播带宽时， 光线路终端根据请求接入的组播节目的组播源的带宽， 判断允 许新的组播节目接入请求后， 光接口的组播带宽是否超过配置的最大组播带 宽， 如果未超过， 光线路终端允许光网络终端接入该组播节目； 否则， 光线路 终端拒绝光网络终端接入该组播节目。
当组播接入控制信息在包括组播源的组播带宽和光线路终端的光接口的 最大组播带宽的基础上，还包括光线路终端连接的光网络终端可请求的最大组 播节目数时， 光线路终端根据请求接入的组播源的带宽， 判断允许新的组播节 目接入请求后，光接口的组播带宽是否超过配置的最大组播带宽及请求组播接 入的光网络终端的组播节目数是否超过配置的最大组播节目数， 如果均未超 过， 光线路终端允许光网络终端接入该组播节目； 否则， 光线路终端拒绝光网 络终端接入该组播节目。
步骤 104: 如果确定允许光网络终端接入该组播节目， 光线路终端转发该 组播节目的组播数据 (或该组播节目的组播流）至请求接入的光网络终端； 光线路终端刷新自身的组播转发表，在组播转发表中与该组播节目对应的 用户列表中增加请求接入的光网络终端，如在组播转发表中与该组播节目对应 的用户列表中增加请求接入的光网络终端标识或光网络终端的 Port ID。光线路 终端接收组播源发送的该组播节目的组播数据，并根据组播转发表转发该组播 节目的组播数据至请求接入的光网络终端。
光线路终端还可以通知光网络终端刷新组播过滤表，以便所述光网络终端 根据组播过滤表过滤接收到的数据以得到自身请求的组播节目的组播数据。光 线路终端可以通过无源光网络系统的操作维护管理通道通知光网络终端 ,即将 通知消息承载在操作维护管理帧中下发给光网络终端。 在 GPON中， 光线路终 端通过 OMCI(ONT management and control interface,光网络终端管理控制接口） 通道的 OMCI组播控制帧通知光网络终端刷新组播过滤表； 在 EPON中， 通过 运行管理维护通道的组播控制帧通知光网络终端刷新组播过滤表。
步骤 105: 如果确定拒绝光网络终端接入该组播节目， 光线路终端不做处 理。 如图 3所示为本发明实施例二控制无源光网络组播接入的系统示意图。 该 系统至少包括光线路终端 1和光网络终端 2，光网络终端 2向光线路终端 1发送组 播节目接入请求， 光线路终端 1根据配置的组播接入控制信息确定是否允许光 网络终端 2接入所请求的组播节目， 如果确定允许， 光线路终端 1接收组播源 3 发送的该组播节目的组播数据， 转发该组播节目的组播数据至光网络终端 2。
其中， 光线路终端 1包括网络接口 10， 光接口 12， 存储单元 13和控制单 元 14。 网络接口 10用于将光线路终端 1与 IP网络互连， 接收来自组播源 3 的组播数据。 光接口 12用于将光线路终端 1与光分配网络相连， 接收光网络 终端 2发送的组播节目接入请求，转发光网络终端 2请求的组播节目的组播数 据至该光网络终端 2。 存储单元 13用于存储通过网管或命令行配置的组播接 入控制信息。 转发单元 11 , 用于根据组播转发表将来自网络接口 10的组播源 3的组播数据转发到相应的光接口 12。控制单元 14用于根据存储单元 13存储 的组播接入控制信息确定是否允许申请组播节目接入的光网络终端接入该组 播节目，如果确定允许，控制网络接口 10接收所申请的组播节目的组播数据， 控制光接口 12转发所申请的组播节目的组播数据至申请组播节目接入的光网 络终端。 由于无源光网络是点到多点的系统，上述控制组播源的数据的接收和 组播数据的有效转发的步骤通过光线路终端 1和光网络终端 2的配合实现，即 可通过光线路终端 1刷新自身的组播转发表（即转发单元中 11的组播转发表）， 并通知光网络终端 2刷新光网络终端 2上的组播过滤表， 使得光线路终端 1 能够根据刷新后的组播转发表转发组播数据，光网络终端 2能够根据刷新后的 组播过滤表接收组播数据。具体的组播转发表和组播过滤表的刷新过程可以参 考上述方法所述， 不再赞述。
组播接入控制信息包括如下一种或多种信息的组合： 组播源 3 的组播带 宽、 光线路终端 1的光接口 12的最大组播带宽和光网络终端 2可请求的最大 组播节目数， 其中， 组播源 3的组播带宽以组播源 3的标识（如组播源的 IP 地址） 与组播源 3的组播带宽——对应的方式存储于存储单元 13中。
组播接入控制信息还可以包括光线路终端 1连接的光网络终端 2可请求的 最大组播节目数，光网络终端 2可请求的最大组播节目数以光网络终端 2的标 识与光网络终端 2可请求的最大组播节目数——对应的方式存储于存储单元 13中。
该光线路终端 1的存储单元 13和控制单元 14可以集成在一个芯片上， 或用一个 CPU来实现。
控制单元 14可以将刷新光网络终端 2刷新组播过滤表的通知通过操作 维护管理通道， 如 GPON系统的 OMCI通道或 EPON系统的 OAM通道， 发送给光网络终端 2， 以便光网络终 2端根据通知中的指示刷新光网络终 端 2上的组播过滤表。
控制单元 14在根据存储单元 13存储的组播接入控制信息确定是否允许 申请组播节目接入的光网络终端 2接入该组播节目时，根据所述组播源 3的组 播带宽， 判断允许所述组播节目接入请求后， 所述光接口 21的组播带宽是否 超过所述最大组播带宽及所述光网络终端 2 的组播节目数是否超过所述最大 组播节目数， 如果均未超过， 则允许所述光网络终端 2接入请求的组播节目； 否则， 拒绝所述光网络终端 2接入请求的组播节目。
所述控制单元 14可以由第一判断单元、 第二判断单元和决策单元组成， 其中： 所述第一判断单元用于根据所述组播源的组播带宽， 判断允许所述组播 节目接入请求后，所述光接口的组播带宽是否超过所述最大组播带宽； 所述第 二判断单元，用于判断所述 ONT的组播节目数是否超过所述最大组播节目数； 所述决策单元，用于当所述第一判断单元和所述第二判断单元的判断结果均为 未超过， 允许所述 ONT接入请求的组播节目； 否则， 拒绝所述 ONT接入请求 的组播节目根据。
光网络终端 2包括光接口 21，用于将光网络终端与光分配网络 2相连， 发送组播节目接入请求至光线路终端 1 , 接收光线路终端 1 转发的所请求 的组播节目的组播数据；
组播数据过滤单元 22, 用于根据组播过滤表接收属于自身请求的组播 节目的组播数据。
其中， 光网络终端 2 可以通过操作维护管理通道， 如 GPON 系统的 OMCI通道或 EPON系统的运行管理维护通道接收光线路终端发送的刷新组 播过滤表的通知，根据通知中的指示刷新组播数据过滤单元 22中的组播过 滤表。 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
1.一种无源光网络组播接入的控制方法，其特征在于，在光线路终端 OLT 上配置组播接入控制信息和配置有用于转发组播数据的组播转发表，光网络终 端 ONT上配置有用于接收组播数据的组播过滤表， 所述方法包括：
所述 OLT接收 ONT发送的组播节目接入请求；
所述 OLT根据所述组播接入控制信息确定是否允许所述光网络终端接入 请求的组播节目， 如果允许， 则刷新自身的组播转发表， 并通知 ONT刷新组 播过滤表；
所述 OLT接收组播源发送的组播数据， 根据刷新后的组播转发表转发所 述组播数据。
2. 如权利要求 1所述的方法， 其特征在于， 所述组播接入控制信息包括如 下一种或多种信息的组合： 所述组播源的组播带宽、 所述 OLT的光接口的最 大组播带宽和 ONT可请求的最大组播节目数。
3. 如权利要求 2所述的方法， 其特征在于， 所述 OLT根据所述组播接入 控制信息确定是否允许所述光网络终端接入请求的组播节目包括：
所述 OLT根据所述组播源的组播带宽， 判断允许所述组播节目接入请求 后， 所述光接口的组播带宽是否超过所述最大组播带宽， 如果未超过， 则允许 所述光网络终端接入请求的组播节目； 否则，拒绝所述光网络终端接入请求的 组播节目。
4. 如权利要求 2所述的方法，其特征在于，所述 OLT根据所述组播接入控 制信息确定是否允许所述 ONT接入请求的组播节目包括：
所述光线路终端根据所述组播源的组播带宽，判断允许所述组播节目接入 请求后， 所述光接口的组播带宽是否超过所述最大组播带宽及所述 ONT的组 播节目数是否超过所述最大组播节目数， 如果均未超过， 则允许所述 ONT接 入请求的组播节目； 否则， 拒绝所述 ONT接入请求的组播节目。
5. 如权利要求 1 - 4任一项所述的方法， 其特征在于， 所述通知 ONT刷新 组播过滤表具体包括：
通过无源光网络系统的操作维护管理通道通知 ONT刷新组播过滤表。
6. 一种无源光网络光线路终端， 其特征在于， 包括：
网^矣口， 用于与 IP网络互连， 接收来自组播源的组播数据；
光接口， 用于与光分配网络相连，接收光网络终端发送的组播节目接入请 求， 转发所述光网络终端请求的组播节目的组播数据至所述光网络终端； 转发单元， 用于根据组播转发表将组播源的组播数据转发到相应的光接 存储单元， 用于存储配置的组播接入控制信息；
控制单元，用于根据所述组播接入控制信息确定是否允许所述光网络终端 接入请求的组播节目，如果确定允许，则刷新自身的组播转发表，并通知 ONT 刷新 ONT上的组播过滤表。
7. 如权利要求 6所述的无源光网络光线路终端， 其特征在于， 所述组播接 入控制信息包括如下一种或多种信息的组合： 所述组播源的组播带宽、所述光 线路终端的光接口的最大组播带宽和光网络终端可请求的最大组播节目数。
8. 如权利要求 Ί所述的无源光网络光线路终端， 其特征在于： 所述控制 单元包括：
第一判断单元，用于根据所述组播源的组播带宽，判断允许所述组播节目 接入请求后， 所述光接口的组播带宽是否超过所述最大组播带宽；
第二判断单元 , 用于判断所述 ONT的组播节目数是否超过所述最大组播 节目数；
决策单元，用于当所述第一判断单元和所述第二判断单元的判断结果均为 未超过， 允许所述 ONT接入请求的组播节目； 否则， 拒绝所述 ONT接入请求 的组播节目根据。
9. 一种无源光网络系统， 包括光线路终端和光网络终端， 其特征在于： 所述光线路终端与 IP网络互连并通过光分配网络连接到光网络终端； 所述光线路终端， 用于根据其上配置的组播转发表转发组播数据； 所述光网络终端， 用于根据其上配置的组播过滤表接收自身的组播数据； 其中，
所述光线路终端接收所述光网络终端发送的组播节目接入请求，根据其上 配置的组播接入控制信息确定是否允许所述光网络终端接入请求的组播节目 , 如果确定允许，刷新自身的组播转发表，并通知 ONT刷新 ONT上的组播过滤 表。
10. 如权利要求 9所述的无源光网络系统， 其特征在于， 所述组播接入控 制信息包括如下一种或多种信息的组合： 所述组播源的组播带宽、所述光线路 终端的光接口的最大组播带宽和光网络终端可请求的最大组播节目数。
11. 如权利要求 10所述的无源光网络系统， 其特征在于， 所述光线路终 端根据所述组播源的组播带宽， 判断允许所述组播节目接入请求后， 所述光接 口的组播带宽是否超过所述最大组播带宽及所述 ONT的组播节目数是否超过 所述最大组播节目数，如果均未超过，则允许所述 ONT接入请求的组播节目； 否则， 拒绝所述 ONT接入请求的组播节目。
PCT/CN2008/073054 2007-11-16 2008-11-14 A control method, device and system for multicast access in passive optical network Ceased WO2009062449A1 (en)

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