WO2012012969A1 - 一种gpon中实现组播的方法、系统和光网络单元 - Google Patents

一种gpon中实现组播的方法、系统和光网络单元 Download PDF

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Publication number
WO2012012969A1
WO2012012969A1 PCT/CN2010/077705 CN2010077705W WO2012012969A1 WO 2012012969 A1 WO2012012969 A1 WO 2012012969A1 CN 2010077705 W CN2010077705 W CN 2010077705W WO 2012012969 A1 WO2012012969 A1 WO 2012012969A1
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multicast
management entity
attribute
interconnection
unit
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PCT/CN2010/077705
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English (en)
French (fr)
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李扬
韩静
武银成
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中兴通讯股份有限公司
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Publication of WO2012012969A1 publication Critical patent/WO2012012969A1/zh

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    • 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
    • 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

Definitions

  • the present invention relates to the field of Gigabit-Capable PON (GPON), and in particular, to a method, system and optical network unit for implementing multicast in GPON. Background technique
  • the GPON system includes an optical line terminal (OLT) disposed on the central office side and an optical network unit (ONU) disposed on the user side.
  • OLT optical line terminal
  • ONU optical network unit
  • the service information selected by the user is passed by the OLT. Broadcast, broadcast, or multicast to the ONU.
  • the Control Interface (OMCI) protocol defines several service models in the GPON system.
  • the 802.1p mapper service model shown in Figure 1 is a priority mapping service model, which defines the 802.1p mapping service configuration (802.1p Mapper).
  • Service Profile The management entity points to the entity relationship of the physical path termination point Ethernet UNI (PPTP Ethernet UNI) management entity and the GPON Interworking Termination Point management entity.
  • the PPTP Ethernet UNI management entity is also associated with a User Network Interface (UNI) or multiple Ethernet PM History Data management entities.
  • the GEM Interworking Termination Point Management Entity can also point to a GPON Encapsulation Port Connection Endpoint ( GEM Port Network CTP) Management entity or Gigabit-capable encapsulation method Adaptation Layer Ethernet Profile (GAL Ethernet Profile) management entity, and Gigabit-packaged adaptation layer Ethernet performance monitoring history data ( GAL Ethernet PM History Data ) Management entity association.
  • GEM Port Network CTP GEM Port Network CTP
  • GAL Ethernet Profile Gigabit-capable encapsulation method Adaptation Layer Ethernet Profile
  • GAL Ethernet PM History Data GAL Ethernet PM History Data
  • the Termination Point management entity enables the ONU to establish a multicast connection with the OLT.
  • Figure 2 is a schematic diagram of the multicast service model specified by the existing G984.4 standard.
  • the model also defines the GEM Multicast Interworking Termination Point management entity and the GEM Interworking Termination Point entity unit. Point to the MAC Bridge Service Profile management entity, where the pointer attribute of the GEM Multicast Interworking Termination Point management entity to the MAC Bridge Service Profile entity unit is described as:
  • This attribute is set to 0 or reserved. For forward compatibility, it can also be set to point to the MAC Bridge Service Profile management entity, IP path service configuration or 802.1p Mapper Service Profile management entity.
  • the G984.4 standard only specifies a multicast model as shown in Figure 2.
  • the GEM Multicast Interworking Termination Point management entity may only be pointed to by the MAC Bridge Port Configuration Data management entity.
  • the entity's 802. lp Mapper business model does not deploy multicast services. In actual applications, users sometimes propose multicast service requirements under the 802. lp Mapper service model. Therefore, the existing 802. lp Mapper service model defined by the G984.4 standard does not meet the needs of users. Summary of the invention
  • the main technical problem to be solved by the present invention is to provide a method, system and optical network unit for implementing multicast in the 802.1p mapper service model in GPON.
  • the present invention provides a method for implementing multicast in a GPON, including:
  • the ONU adds the pointer attribute of the multicast interconnection endpoint to the 802.1p mapping service configuration management entity under the 802.1p mapping service model.
  • the ONU configures the multicast interconnection termination point to point to the multicast GEM interconnection termination point management entity, and uses the multicast GEM interconnection termination point management entity to establish a multicast service connection with the OLT.
  • the method further includes: the ONU adds an attribute of the multicast priority list to the 802.1p mapping service configuration management entity, and the attribute of the multicast priority list takes effect when the pointer attribute of the multicast interconnection endpoint is valid.
  • the method further includes: configuring, in the multicast priority list, whether packets of different priorities are grouped through the multicast service channel broadcast.
  • the multicast priority list includes a total of 9 bytes, and the first to eighth bytes respectively identify whether the packet with the priority of 0 to 7 is multicast through the multicast service channel, and the ninth byte identifier Whether the untagged packet is multicast through the multicast service channel.
  • the method further includes: the packet with the priority of the multicast priority list being 0 to 7 and the unlabeled message being multicasted by the multicast service channel.
  • the method further includes: the ONU receiving an ONU management control interface message that is sent by the OLT and required to perform entity configuration.
  • the ONU configures the multicast interconnection endpoint to point to the multicast GEM interconnection endpoint management entity: the pointer value of the multicast interconnection endpoint is set to the address information of the multicast GEM interconnection termination management entity.
  • the address information is a management entity code of the multicast GEM interconnection termination point management entity.
  • the present invention also provides an optical network unit for implementing multicast in a GPON, including an attribute adding unit, a configuration management unit, and a multicast connecting unit;
  • the attribute adding unit is configured to add a pointer attribute of the multicast interconnect termination point to the 802.1p mapping service configuration management entity in the 802.1p mapping service model;
  • the configuration management unit is configured to configure the multicast interconnection endpoint to point to a multicast GEM interconnection endpoint management entity
  • the multicast connection unit is configured to establish a multicast service connection with the OLT by using the multicast GEM interconnection endpoint management entity.
  • the attribute adding unit is further configured to: add an attribute of the multicast priority list to the 802.1p mapping service configuration management entity; and when the pointer attribute of the multicast interconnection end point is valid, the attribute of the multicast priority list is valid.
  • the configuration management unit is further configured to configure, in the multicast priority list, whether packets of different priorities are multicast through the multicast service channel.
  • the present invention also provides a system for implementing multicast in a GPON network, including an optical line terminal and an optical network unit, where the optical network unit further includes: an attribute adding unit, a configuration management unit, and a multicast connecting unit;
  • the attribute adding unit is configured to add a pointer attribute of the multicast interconnect termination point to the 802.1p mapping service configuration management entity under the 802.1p mapping service model;
  • the configuration management unit is configured to configure the multicast interconnection endpoint to point to a multicast GEM interconnection endpoint management entity
  • the multicast connection unit is configured to establish a multicast service connection with the OLT by using the multicast GEM interconnection endpoint management entity.
  • the attribute adding unit is further configured to: add an attribute of the multicast priority list to the 802.1p mapping service configuration management entity; and when the pointer attribute of the multicast interconnection end point is valid, the attribute of the multicast priority list is valid.
  • the configuration management unit is further configured to configure, in the multicast priority list, whether packets of different priorities are multicast through the multicast service channel.
  • the 802.1p Mapper Service Profile management entity can point to the Multicast GEM Interworking Termination Point management entity, and the ONU can be in 802.
  • the multicast service is implemented under the lp Mapper model.
  • the invention forms a beneficial expansion of the service mode provided by the 802.1p Mapper model in the existing GPON system, and can further meet the needs of users.
  • Figure 1 is a schematic diagram of the 801. lp Mapper service model specified by the existing G984.4 standard;
  • Figure 2 is a schematic diagram of the multicast service model specified by the existing G984.4 standard;
  • FIG. 3 is a flowchart of a method for implementing multicast in a GPON according to the present invention
  • FIG. 4 is a schematic diagram of a 801. lp Mapper service model for implementing multicast in GPON according to the present invention
  • FIG. 5 is a system block diagram of implementing multicast in GPON according to the present invention. detailed description
  • the present invention improves the existing 801. lp Mapper service model defined by the OMCI protocol, and enables the ONU to implement multicast services under the 801. lp Mapper service model by adding and configuring the attributes of the 802. lp Mapper Service Profile management entity.
  • FIG. 3 is a flowchart of a method for implementing multicast in a GPON according to the present invention. As shown in FIG. 3, a method for implementing multicast in a GPON according to an embodiment of the present invention includes the following steps:
  • Step S301 ONU in the 802. lp Mapper business model, on the 802. lp Mapper Service
  • the profile management entity adds an attribute named Multicast Interworking Termination Point (Multicast IWTP), which is a pointer attribute.
  • Multicast IWTP Multicast Interworking Termination Point
  • the G984.4 standard currently specifies 13 attributes of the 802. lp Mapper Service Profile management entity, so the added Multicast IWTP attribute can be used as the 14th attribute.
  • Point to a Multicast GEM Interworking Termination Point management entity the pointer value is the address information of the Multicast GEM Interworking Termination Point managed entity pointed to.
  • the address information of the Multicast GEM Interworking Termination Point management entity can take its MEID.
  • the pointer value should be greater than 0, less than 0XFFFF. If the pointer value is 0 or 0XFFFF, the pointer value is invalid.
  • the added Multicast IWTP attributes can be described as follows:
  • Multicast IWTP Pointer This attribute points to a Multicast GEM Interworking
  • the pointer value is the MEID of the Multicast GEM Interworking Termination Point managed entity pointed to, the pointer value is greater than 0, less than 0XFFFF.
  • Step S302 Add an attribute named "Multicast Priority Table" to the 802. lp Mapper Service Profile management entity, which is used as the 15th attribute of the 802. lp Mapper Service Profile management entity, and is used to specify a group. Whether packets of different priorities are multicast through the multicast service channel during the broadcast. For example, you can determine which priority packets can be transmitted and which priority packets can be discarded.
  • the Multicast Priority Table attribute needs to be configured only if the 801. lp Mapper service model has multicast capability. Therefore, when the Multicast IWTP attribute is valid, the Multicast Priority Table attribute takes effect.
  • the Multicast Priority Table can include 9 bytes.
  • the first to eighth bytes are used to identify whether the packets with the priority of 0 to 7 are multicast through the multicast service channel, and the ninth byte is used to identify the unlabeled packets. (untag) Whether the packet is multicast through the multicast service channel. That is, the first byte indicates whether the packet with the priority of 0 is multicast, and the eighth byte indicates whether the byte with the priority of 7 is multicast. Specifically, when a certain byte value is configured as 0, the packet indicating the priority of the byte is discarded. When the byte value is set to 1, the packet indicating the priority of the byte is passed. The multicast service channel performs multicast, and other values are reserved. In the default configuration, the 9-byte byte value is 1, that is, all the priority and untag labels are multicast through the multicast service channel.
  • This attribute includes 9 bytes.
  • the first to eighth bytes identify whether the packets with the priority of 0 to 7 are multicast through the multicast service channel, and the ninth byte identifies the untag. Whether the packet is multicast through the multicast service channel; the byte value is 0, indicating that the packet is discarded. The byte value is 1 for the packet to pass. By default, all the priority and untag packets are passed. This property takes effect when the Multicast IWTP property is valid.
  • Step S303 When the user has a multicast request, the ONU needs to configure the two attributes added according to the configuration requirements of the attributes, and the OLT first sends an OMCI message requesting the entity configuration to the ONU, and the ONU receives the OMCI message. Configure the two attributes added above.
  • the ONU first configures the Multicast IWTP to point to a Multicast GEM Interworking Termination Point management entity, for example, setting its pointer value to the MEID of a Multicast GEM Interworking Termination Point management entity.
  • FIG. 4 is a schematic diagram of a 801.Ip Mapper service model for implementing multicast in a GPON according to the present invention.
  • the 802.Ip Mapper Service Profile management entity can point to the Multicast GEM under the 802.Ip Mapper service model.
  • the Interworking Termination Point manages the entity so that the Multicast GEM Interworking Termination Point management entity can be used to establish a multicast service connection between the ONU and the OLT.
  • Step S304 Configure whether packets of different priorities are in the Multicast Priority Table.
  • the multicast service channel is used for multicast. For example, according to the configuration requirements, set the first to eighth bytes to identify whether the packets with the priority of 0 to 7 are multicast through the multicast service channel. The ninth byte identifies none. Whether the label packet is multicast through the multicast service channel.
  • Step S305 After the above configuration is completed, the ONU can use the Multicast GEM Interworking Termination Point management entity to establish a multicast service connection with the OLT, and perform multicast services according to the existing service multicast mode. Specifically, the multicast service connection is established.
  • the method includes the following steps: Step A: The ONU receives an OMCI message from the OLT, and includes a management configuration message such as a multicast entry.
  • Step B The ONU determines whether the multicast service channel is connected. If it is already connected, go to step C; otherwise, the process ends.
  • Step C Create a multicast service channel.
  • the multicast stream from the OLT can be transmitted to the corresponding port of the ONU through the multicast service channel to implement the multicast service in the 802. lp Mapper service model.
  • FIG. 5 is a block diagram of a system for implementing multicast in a GPON according to the present invention.
  • the present invention further protects a system for implementing multicast in a GPON, including an ONU 10 and an OLT 20.
  • the ONU 10 further includes an attribute adding unit. 11.
  • the pointer attribute of Multicast IWTP is valid
  • the Multicast Priority Table attribute is valid.
  • the configuration management unit 12 is configured to configure the Multicast IWTP to point to the Multicast GEM Interworking Termination Point management entity, for example, set the pointer value to the MEID of a Multicast GEM Interworking Termination Point management entity according to step S303; and also configured in the Multicast Priority Table Whether packets of different priorities are multicast through the multicast service channel, for example, in the manner of step S304.
  • the multicast connection unit 13 is configured to establish a multicast service connection with the OLT 20 by using a Multicast GEM Interworking Termination Point management entity.
  • the 802.1p Mapper Service Profile management entity can point to the Multicast GEM Interworking Termination Point management entity, and the ONU can be in 802.
  • the lp Mapper model implements the multicast service, which forms a beneficial extension to the service mode provided by the 802. lp Mapper model in the existing GPON system, and can further meet the needs of users.

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Abstract

本发明公开了一种吉比特无源光网络（GPON）中实现组播的方法ONU在802.1p映射业务模型下，对802.1p映射业务配置管理实体增加组播互联终结点的指针属性；ONU配置所述组播互联终结点指向组播GEM互联终结点管理实体，并利用所述组播GEM互联终结点管理实体与OLT建立组播业务连接。本发明还相应地公开了一种GPON中实现组播的系统和光网络单元。本发明通过对802.1p映射业务配置管理实体增加和配置属性，在802.1p映射业务模型下实现了组播，对现有的业务模型形成有益扩充，能够进一步满足用户需求。

Description

一种 GPON中实现组播的方法、 系统和光网络单元 技术领域
本发明涉及吉比特无源光网络（ Gigabit-Capable PON , GPON )领域， 尤其涉及一种 GPON中实现组播的方法、 系统和光网络单元。 背景技术
GPON系统包括设置在局侧的光线路终端 （Optical Line Terminal , OLT) 和设置在用于用户侧的光网络单元 （Optical Network Unit, ONU), 通常情 况下， 用户选择的业务信息由 OLT通过单播、 广播或组播等方式传输至 ONU。
国际标准 G984.4 通过 ONU 管理控制接口 （ ONU Management and
Control Interface , OMCI )协议定义了 GPON系统中的几种业务模型，其中， 图 1所示的 802.1p mapper业务模型是一种优先级映射业务模型， 具体定义 了 802.1p映射业务配置（802.1p Mapper Service Profile )管理实体指向物理 路径终结点以太网用户网络接口 （Physical Path Termination Point Ethernet UNI, PPTP Ethernet UNI )管理实体和 GPON封装方式互联终结点 （GEM Interworking Termination Point ) 管理实体的实体关系。 PPTP Ethernet UNI 管理实体还与用户网络接口 （UNI ) 或多个以太网性能监控历史数据 ( Ethernet PM History Data )管理实体相关联, GEM Interworking Termination Point 管理实体还可指向 GPON 封装方式端口连接终结点 （GEM Port Network CTP ) 管理实体或吉比特封装适配层以太网配置 （ Gigabit-capable encapsulation method Adaptation Layer Ethernet Profile , GAL Ethernet Profile ) 管理实体， 且与吉比特封装适配层以太网性能监控历史数据（GAL Ethernet PM History Data )管理实体相关联。 目前的 G984.4标准中， 仅规定了介质访问控制桥端口配置数据 ( MAC Bridge Port Configuration Data )管理实体才能指向 GEM组播互联终结点 ( GEM Multicast Interworking Termination Point )管理实体， 从而利用 GEM Multicast Interworking Termination Point管理实体使 ONU与 OLT建立组播 连接， 图 2为现有 G984.4标准规定的组播业务模型示意图， 该模型还定义 了 GEM Multicast Interworking Termination Point 管理实体与 GEM Interworking Termination Point 实体单元同时指向介质访问控制桥业务配置 ( MAC Bridge Service Profile )管理实体，其中， GEM Multicast Interworking Termination Point管理实体指向 MAC Bridge Service Profile实体单元的指针 属性描述为：
业务配置指针： 该属性设置为 0或保留， 考虑到向前的兼容性， 也可 以设置指向 MAC Bridge Service Profile管理实体、 IP路径业务配置或 802.1p Mapper Service Profile管理实体。
该属性实际上在标准中已经废弃不用， 只是为了向前的兼容性才考虑 保留。
可见， G984.4 标准只规定了图 2 所示的一种组播模型， 其中 GEM Multicast Interworking Termination Point管理实体只可能被 MAC Bridge Port Configuration Data 管理实体所指向， 对于不存在 MAC Bridge Port Configuration Data管理实体的 802. lp Mapper 业务模型并不能展开组播业 务。 而实际应用中， 用户在 802. lp Mapper 业务模型下， 有时也会提出组播 的业务需求， 因此， G984.4标准定义的现有 802. lp Mapper 业务模型并不 能满足用户的需求。 发明内容
本发明要解决的主要技术问题是， 提供一种 GPON中在 802.1p mapper 业务模型下实现组播的方法、 系统和光网络单元。 为解决上述技术问题，本发明提供一种 GPON中实现组播的方法,包括：
ONU在 802.1p映射业务模型下， 对 802.1p映射业务配置管理实体增 加组播互联终结点的指针属性；
ONU配置所述组播互联终结点指向组播 GEM互联终结点管理实体， 并利用所述组播 GEM互联终结点管理实体与 OLT建立组播业务连接。
该方法还包括： ONU对 802.1p映射业务配置管理实体增加组播优先级 列表的属性， 所述组播互联终结点的指针属性有效时， 所述组播优先级列 表的属性生效。
所述对 802. lp映射业务配置管理实体增加组播优先级列表的属性后， 该方法还包括： 在所述组播优先级列表中配置不同优先级的报文是否通过 组播业务通道进行组播。
所述组播优先级列表共包括 9个字节， 第 1至 8个字节分别标识优先 级为 0至 7的报文是否通过所述组播业务通道进行组播， 第 9个字节标识 无标签报文是否通过所述组播业务通道进行组播。
该方法还包括： 所述组播优先级列表优先级为 0至 7的报文以及无标 签>¾文都通过所述组播业务通道进行组播。
所述 ONU配置所述组播互联终结点指向组播 GEM互联终结点管理实 体之前， 该方法还包括： 所述 ONU接收 OLT下发的要求进行实体配置的 ONU管理控制接口消息。
所述 ONU配置所述组播互联终结点指向组播 GEM互联终结点管理实 体为：将所述组播互联终结点的指针值设置为组播 GEM互联终结点管理实 体的地址信息。
所述地址信息取所述组播 GEM互联终结点管理实体的管理实体码。 本发明还提出一种 GPON中实现组播的光网络单元， 包括属性增加单 元、 配置管理单元和组播连接单元； 其中， 所述属性增加单元， 用于在 802.1p 映射业务模型下，对 802.1p映射业 务配置管理实体增加组播互联终结点的指针属性；
所述配置管理单元，用于配置所述组播互联终结点指向组播 GEM互联 终结点管理实体；
所述组播连接单元， 用于利用所述组播 GEM 互联终结点管理实体与 OLT建立组播业务连接。
所述属性增加单元还用于对 802.1p映射业务配置管理实体增加组播优 先级列表的属性； 所述组播互联终结点的指针属性有效时， 所述组播优先 级列表的属性生效。
所述配置管理单元还用于在所述组播优先级列表中配置不同优先级的 报文是否通过组播业务通道进行组播。
本发明还提出一种 GPON网络中实现组播的系统， 包括光线路终端和 光网络单元， 所述光网络单元进一步包括： 属性增加单元、 配置管理单元 和组播连接单元； 其中，
所述属性增加单元， 用于在 802.1p 映射业务模型下，对 802.1p映射业 务配置管理实体增加组播互联终结点的指针属性；
所述配置管理单元，用于配置所述组播互联终结点指向组播 GEM互联 终结点管理实体；
所述组播连接单元， 用于利用所述组播 GEM 互联终结点管理实体与 OLT建立组播业务连接。
所述属性增加单元还用于对 802.1p映射业务配置管理实体增加组播优 先级列表的属性； 所述组播互联终结点的指针属性有效时， 所述组播优先 级列表的属性生效。
所述配置管理单元还用于在所述组播优先级列表中配置不同优先级的 报文是否通过组播业务通道进行组播。 本发明通过在 802. lp Mapper模型下对 802. lp Mapper Service Profile管 理实体增加 Multicast IWTP的指针属性， 使 802.1p Mapper Service Profile 管理实体能够指向 Multicast GEM Interworking Termination Point管理实体， ONU即可在 802. lp Mapper模型下实现组播业务。 本发明对现有 GPON系 统中 802.1p Mapper模型提供的业务方式形成有益扩充， 能够进一步满足用 户的需求。 附图说明
图 1为现有 G984.4标准规定的 801. lp Mapper业务模型示意图； 图 2为现有 G984.4标准规定的组播业务模型示意图；
图 3为本发明的 GPON中实现组播的方法流程图；
图 4为本发明在 GPON中实现组播的 801. lp Mapper业务模型示意图； 图 5为本发明的 GPON中实现组播的系统框图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
本发明对 OMCI协议定义的现有 801. lp Mapper业务模型进行改进，通 过增加和配置 802. lp Mapper Service Profile 管理实体的属性， 使 ONU在 801. lp Mapper业务模型下实现组播业务。
图 3为本发明 GPON中实现组播的方法流程图， 如图 3所示， 本发明 一种实施例在 GPON中实现组播的方法包括以下步骤：
步骤 S301： ONU在 802. lp Mapper业务模型下，对 802. lp Mapper Service
Profile 管理实体增加名称为组播互联终结点 （ Multicast Interworking Termination Point, Multicast IWTP ) 的属性， 该属性为一指针属性。
G984.4标准目前已经规定了 802. lp Mapper Service Profile管理实体的 13个属性， 因此增加的 Multicast IWTP属性可作为第 14个属性， 该属性 指向一个 Multicast GEM Interworking Termination Point 管理实体， 指针值 为被指向的 Multicast GEM Interworking Termination Point管理实体的地址 信息。
不同的 Multicast GEM Interworking Termination Point管理实体具有不 同的管理实体码（MEID ), 因此， Multicast GEM Interworking Termination Point管理实体的地址信息可取其 MEID。 这种情况下， 为了保证属性的有 效性， 指针值应当大于 0, 小于 0XFFFF, 如果指针值为 0或者 0XFFFF, 则表示该指针值无效。
增加的 Multicast IWTP属性可具体描述如下：
Multicast IWTP指针： 该属性指向一个 Multicast GEM Interworking
Termination Point 管理实体，指针值为被指向的 Multicast GEM Interworking Termination Point管理实体的 MEID , 指针值大于 0 , 小于 0XFFFF。
步骤 S302: 对 802. lp Mapper Service Profile管理实体增加名称为组播 优先级列表 ( Multicast Priority Table )的属性， 该属性可作为 802. lp Mapper Service Profile管理实体的第 15个属性，用于规定组播过程中不同优先级的 报文是否通过组播业务通道进行组播。 例如， 根据实际需要， 判断哪些优 先级的报文可以传输， 哪些优先级的报文可以丟弃。
只有在 801. lp Mapper业务模型具有组播能力的前提下， 才需要配置 Multicast Priority Table属性， 因此， Multicast IWTP属性有效时， Multicast Priority Table属性才生效。
Multicast Priority Table可包括 9个字节，釆用第 1至 8个字节分别标识 优先级为 0至 7的报文是否通过组播业务通道进行组播， 釆用第 9个字节 标识无标签（untag )报文是否通过组播业务通道进行组播， 即第 1个字节 表示优先级为 0的报文是否组播， 第 8个字节表示优先级为 7的字节是否 组播。 具体地， 当某一字节值配置为 0 时， 表示该字节对应的优先级的报文 丟弃， 当该字节值配置为 1 时， 表示该字节对应的优先级的报文通过组播 业务通道进行组播， 其他值预留。 默认的配置下， 9个字节的字节值都为 1 , 即全部优先级和 untag标签的 文都通过组播业务通道进行组播。
增加的 Multicast Priority Table属性可具体描述如下：
Multicast Priority Table: 该属性包括 9个字节， 第 1至 8个字节分别标 识优先级为 0至 7的报文是否通过组播业务通道进行组播， 釆用第 9个字 节标识 untag报文是否通过组播业务通道进行组播；字节值为 0表示报文丟 弃， 字节值为 1 表示报文通过； 默认全部优先级和 untag报文都通过。 Multicast IWTP属性有效时该属性生效。
考虑到不同业务模型的兼容性， 防止业务冲突， 以上增加的两个属性 仅在 802.1p Mapper 业务模型下有效， 在 G984.4 标准规定的存在 MAC Bridge Port Configuration Data管理实体的组播模型下， 这两个属性无效。
步骤 S303: 当用户有组播要求时， ONU需要按照各属性的配置要求， 对以上增加的两个属性进行配置， OLT首先向 ONU下发要求进行实体配置 的 OMCI消息 , ONU接收该 OMCI消息后对以上增加的两种属性进行配置。
这里， ONU 首先配置 Multicast IWTP 指向一个 Multicast GEM Interworking Termination Point 管理实体， 例如将其指针值设置为某一 Multicast GEM Interworking Termination Point管理实体的 MEID。
图 4为本发明在 GPON中实现组播的 801. Ip Mapper业务模型示意图， 如图 4 所示， 配置完成后在 802. Ip Mapper 业务模型下， 802. Ip Mapper Service Profile管理实体能够指向 Multicast GEM Interworking Termination Point管理实体，从而可以利用 Multicast GEM Interworking Termination Point 管理实体使 ONU与 OLT建立组播业务连接。
步骤 S304: 在 Multicast Priority Table中配置不同优先级的报文是否通 过组播业务通道进行组播， 例如根据配置要求， 设置第 1至 8个字节分别 标识优先级为 0至 7的报文是否通过组播业务通道进行组播， 第 9个字节 标识无标签报文是否通过组播业务通道进行组播。
步骤 S305:以上配置完成后， ONU即可利用 Multicast GEM Interworking Termination Point管理实体与 OLT建立组播业务连接，并按照现有的业务组 播方式开展组播业务， 具体地， 建立组播业务连接具体包括以下步骤： 步骤 A: ONU接收来自 OLT的 OMCI消息，其中包含组播表项等管理 配置消息。
步骤 B: ONU判断组播业务通道是否已经连通， 如果已经连通， 则进 入步骤 C; 否则， 流程结束。
步骤 C: 创建组播业务通道。
组播业务连接建立以后， 来自 OLT的组播流即可通过该组播业务通道 传输至 ONU的相应端口， 实现 802. lp Mapper业务模型下的组播业务。
图 5为本发明的 GPON中实现组播的系统框图， 如图 5所示， 本发明 还保护了一种 GPON中实现组播的系统， 包括 ONU 10和 OLT 20, ONU 10 进一步包括属性增加单元 11、 配置管理单元 12和组播连接单元 13; 其中 , 属性增加单元 11用于在 802. lp Mapper业务模型下， 对 802. lp Mapper Service Profile 管理实体增加 Multicast IWTP 的指针属性以及 Multicast Priority Table属性， Multicast IWTP的指针属性生效时， Multicast Priority Table属性有效。
配置管理单元 12 用于配置 Multicast IWTP 指向 Multicast GEM Interworking Termination Point管理实体， 例如按照步骤 S303的方式将指针 值设置为某一 Multicast GEM Interworking Termination Point 管理实体的 MEID; 还用于在 Multicast Priority Table中配置不同优先级的报文是否通过 组播业务通道进行组播， 例如按照步骤 S304的方式进行配置。 组播连接单元 13 用于利用 Multicast GEM Interworking Termination Point管理实体与 OLT 20建立组播业务连接。
本发明通过在 802. lp Mapper模型下对 802. lp Mapper Service Profile管 理实体增加 Multicast IWTP的指针属性， 使 802.1p Mapper Service Profile 管理实体能够指向 Multicast GEM Interworking Termination Point管理实体， ONU即可在 802. lp Mapper模型下实现组播业务， 对现有 GPON 系统中 802. lp Mapper模型提供的业务方式形成有益扩充， 能够进一步满足用户的 需求。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1、 一种吉比特无源光网络 GPON中实现组播的方法， 其特征在于， 该 方法包括：
ONU在 802.1p映射业务模型下， 对 802.1p映射业务配置管理实体增 加组播互联终结点的指针属性；
ONU配置所述组播互联终结点指向组播 GEM互联终结点管理实体， 并利用所述组播 GEM互联终结点管理实体与 OLT建立组播业务连接。
2、 如权利要求 1 所述的方法， 其特征在于， 该方法还包括： ONU对 802. lp 映射业务配置管理实体增加组播优先级列表的属性， 所述组播互联 终结点的指针属性有效时， 所述组播优先级列表的属性生效。
3、 如权利要求 2所述的方法， 其特征在于， 所述对 802.1p映射业务配 置管理实体增加组播优先级列表的属性后， 该方法还包括： 在所述组播优 先级列表中配置不同优先级的报文是否通过组播业务通道进行组播。
4、 如权利要求 3所述的方法， 其特征在于， 所述组播优先级列表共包 括 9个字节， 第 1至 8个字节分别标识优先级为 0至 7的报文是否通过所 述组播业务通道进行组播， 第 9个字节标识无标签报文是否通过所述组播 业务通道进行组播。
5、 如权利要求 4所述的方法， 其特征在于， 该方法还包括： 所述组播 优先级列表优先级为 0至 7的报文以及无标签报文都通过所述组播业务通 道进行组播。
6、 如权利要求 1至 5中任一项所述的方法， 其特征在于， 所述 ONU 配置所述组播互联终结点指向组播 GEM互联终结点管理实体之前，该方法 还包括：所述 ONU接收 OLT下发的要求进行实体配置的 ONU管理控制接 口消息。
7、 如权利要求 1至 5中任一项所述的方法， 其特征在于， 所述 ONU 配置所述组播互联终结点指向组播 GEM互联终结点管理实体为：将所述组 播互联终结点的指针值设置为组播 GEM互联终结点管理实体的地址信息。
8、 如权利要求 7所述的方法， 其特征在于， 所述地址信息取所述组播 GEM互联终结点管理实体的管理实体码。
9、 一种 GPON中实现组播的光网络单元， 其特征在于， 该光网络单元 包括属性增加单元、 配置管理单元和组播连接单元； 其中，
所述属性增加单元， 用于在 802.1p 映射业务模型下，对 802.1p映射业 务配置管理实体增加组播互联终结点的指针属性；
所述配置管理单元，用于配置所述组播互联终结点指向组播 GEM互联 终结点管理实体；
所述组播连接单元， 用于利用所述组播 GEM 互联终结点管理实体与 OLT建立组播业务连接。
10、 如权利要求 9所述的 GPON中实现组播的光网络单元， 其特征在 于， 所述属性增加单元还用于对 802.1p映射业务配置管理实体增加组播优 先级列表的属性； 所述组播互联终结点的指针属性有效时， 所述组播优先 级列表的属性生效。
11、 如权利要求 10所述的 GPON中实现组播的光网络单元， 其特征在 于， 所述配置管理单元还用于在所述组播优先级列表中配置不同优先级的 报文是否通过组播业务通道进行组播。
12、 一种 GPON网络中实现组播的系统， 其特征在于， 该系统包括光 线路终端和光网络单元， 所述光网络单元进一步包括： 属性增加单元、 配 置管理单元和组播连接单元； 其中，
所述属性增加单元， 用于在 802.1p 映射业务模型下，对 802.1p映射业 务配置管理实体增加组播互联终结点的指针属性；
所述配置管理单元，用于配置所述组播互联终结点指向组播 GEM互联 终结点管理实体；
所述组播连接单元， 用于利用所述组播 GEM 互联终结点管理实体与 OLT建立组播业务连接。
13、 如权利要求 12所述的系统， 其特征在于， 所述属性增加单元还用 于对 802.1p映射业务配置管理实体增加组播优先级列表的属性； 所述组播 互联终结点的指针属性有效时， 所述组播优先级列表的属性生效。
14、 如权利要求 13所述的系统， 其特征在于， 所述配置管理单元还用 于在所述组播优先级列表中配置不同优先级的报文是否通过组播业务通道 进行组播。
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