WO2013135159A1 - 一种同轴电缆宽带接入业务数据流的标记方法 - Google Patents
一种同轴电缆宽带接入业务数据流的标记方法 Download PDFInfo
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- WO2013135159A1 WO2013135159A1 PCT/CN2013/072437 CN2013072437W WO2013135159A1 WO 2013135159 A1 WO2013135159 A1 WO 2013135159A1 CN 2013072437 W CN2013072437 W CN 2013072437W WO 2013135159 A1 WO2013135159 A1 WO 2013135159A1
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- 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
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- 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]
- H04L12/2801—Broadband local area networks
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- 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
Definitions
- the present invention relates to the field of communications, and in particular to a method for marking a data stream of a broadband access service of a coaxial cable under the framework of a C-DOCSIS access system. Background technique
- the C-DOCSIS standard is developed by the State Administration of Radio, Film and Television to solve the problem of domestic next-generation broadband access technology and two-way network transformation, based on DOCSIS 3.0 standard technology, combined with domestic passive optical network (PON), hybrid optical copper network (HFC), edge broadband
- PON domestic passive optical network
- HFC hybrid optical copper network
- edge broadband The Chinese DOCSIS technical standard was formulated based on the actual situation of the access network.
- the head end of the C-DOCSIS system consists of a radio interface module, a classification forwarding module, and a system control module.
- the traffic forwarding module and the radio interface module in the C-DOCSIS access system architecture need to identify the service flows in the uplink and downlink directions, and provide support for the QoS processing of the service packets in the aggregation layer and the radio interface module.
- the loose coupling between the classifying forwarding module and the RF interface module can support the distributed implementation of the C-DOCSIS access system and ensure the interoperability between C-DOCSIS components of different vendors.
- the prior art DOCSIS system design does not provide this standard interface, so the distributed implementation of the classful forwarding module and the radio interface module based on standard interoperability cannot be supported.
- the upper layer aggregation network especially the passive optical network PON network
- the present invention provides a method for marking a data stream of a broadband access service of a coaxial cable, which is a data flow between the classification forwarding module and the radio interface module in the uplink and downlink directions.
- Conduct business and user identification methods to support loose coupling between the two modules Connect and solve the problem of classification forwarding and priority mapping of C-DOCSIS service flow to the upper layer aggregation network, which makes the architecture application more flexible, and realizes the distributed architecture of C-DOCSIS system and guarantees C-DOCSIS components of different manufacturers. Interoperability.
- a method for marking a data stream of a broadband cable access service of the present invention includes: in an uplink data transmission direction:
- the terminal transmits the data packet and the traffic shaping data packet to the radio frequency interface module; the radio frequency interface module inserts a CDT tag in the data frame header of the data packet; the radio frequency interface module transmits the data packet to the classified forwarding Module
- the classifying forwarding module maps the CDT tag to a service tag supported by the aggregation network; in the downlink data transmission direction:
- the classification forwarding module inserts the Ethernet frame header of the data packet transmitted by the aggregation network into a CDT label.
- the classifying forwarding module transmits the data packet to a radio frequency interface module
- the CDT tag includes a CoS field and a VID field, where the CoS field is a service flow reference identifier, and the VID field is a terminal identifier, where the CoS field and the CoS field are combined to specify a specific service flow of a specific terminal.
- the CDT tag further includes a TPID field, where the TPID field is a specific fixed value, and is used to mark the data packet to be transmitted between the radio interface module and the class forwarding module.
- the CoS field has a correspondence with the priority of the data packet; so that the network device between the radio interface module and the classifying forwarding module performs priority scheduling on the data packet.
- the information interaction between the radio frequency interface module and the classification forwarding module and the CDT label management are controlled by the system control module, and the radio frequency interface module includes CDMM management of the correspondence between the VID field and the CoS field of the terminal to which the data packet belongs and the service flow.
- the information is transmitted to the system control module, and the system control module transmits, by using the CDMM management information, the VID field and the CoS field of the terminal to which the data packet belongs and the CoS field to the classification forwarding module.
- a mapping table of the VID field and the MAC address of the terminal is separately stored in the radio frequency interface module and the class forwarding module.
- the method further includes: in an uplink data transmission direction, the radio frequency interface module searches the mapping table, and obtains a corresponding VID value according to a source MAC address of the data packet frame header; and in a downlink data transmission direction, the classification forwarding module The mapping table is searched, and a corresponding VID value is obtained according to a destination MAC address of a frame header of the data packet.
- the method for marking a data stream of a broadband access service of a coaxial cable is a method for identifying a service and a user of a data flow in an uplink and a downlink direction between a classification forwarding module and a radio interface module to support
- the loosely coupled connection between the two modules solves the problem of classification forwarding and priority mapping of the C-DOCSIS service flow to the upper layer aggregation network, which makes the architecture application more flexible and realizes the distributed architecture and guarantee of the C-DOCSIS system. Interoperability between C-DOCSIS components from different vendors.
- FIG. 1 is a flow chart of an uplink transmission direction of a method for marking a data stream of a broadband access service of a coaxial cable according to the present invention
- FIG. 2 is a flow chart of a downlink transmission direction of a method for marking a data stream of a broadband access service of a coaxial cable according to the present invention
- FIG. 3 is a schematic diagram of a format of a CDT tag of the present invention.
- FIG. 4 is a schematic diagram of the structure of the C-DOCSIS system. detailed description
- FIG. 1 and 2 are flowcharts showing a method for marking a data stream of a coaxial cable broadband access service according to the present invention
- FIG. 4 is a schematic structural diagram of a C-DOCSIS system.
- step 1 terminal 74 will perform data.
- the data packet of the classification and traffic shaping is transmitted to the radio frequency interface module 71; in step 2, the radio frequency interface module 71 inserts a CDT tag at the data frame header of the data packet; and in step 3, the radio frequency interface module 71 parses the data packet.
- the method is transmitted to the class forwarding module 73.
- the class forwarding module 73 maps the CDT tag to a service tag supported by the aggregation network.
- step 1 the classification forwarding module 73 inserts the Ethernet frame header of the data packet transmitted by the aggregation network into a CDT label; in step 2, the classification forwarding module 73 will The data packet is transmitted to the radio frequency interface module 71; in step 3, the radio frequency interface module 71 receives the data packet, identifies the terminal 74 and the service flow to which the data packet belongs according to the CDT tag, and transmits the data packet to the corresponding Terminal 74.
- the CDT tag includes a CoS field and a VID field, where the CoS field is a service flow reference identifier, the VID field is a terminal identifier, and the CoS field is combined with the CoS field to specify a specific service flow of a specific terminal. .
- the marking method of the present invention is a method for identifying services and users in the uplink and downlink data streams between the classification forwarding module and the radio frequency interface module, to support loose coupling between the two modules, and to solve C - DOCSIS service flow
- the classification forwarding and priority mapping of the upper layer aggregation network makes the architecture application more flexible, and at the same time realizes the distributed architecture of the C-DOCSIS system and ensures the interoperability between C-DOCSIS components of different vendors.
- the service marking method uses a CDT label to perform unified format marking on the uplink and downlink service flows between the service forwarding module and the radio interface module, and provides service data flow processing between the service forwarding module and multiple different radio interface modules. A unified standard interface protocol.
- the CDT tag further includes a TPID field, the TPID field being a specific fixed value for marking that the data packet is transmitted between the radio interface module and the class forwarding module.
- the specific format of the CDT tag is as shown in FIG. 3.
- the CDT tag includes 32 bytes, wherein the VID field is 0-1 1 byte, the CFT bit field is the 12th byte, and the fixed value is 0, CoS.
- the field is 13-15 bytes, the TPID field is 16-31 bytes, and its fixed value is 0 ⁇ 88 ⁇ 8, which is used to mark the data packet to be transmitted between the RF interface module and the class forwarding module.
- the CDT uses a format that matches the 802.1 P/Q VLAN tag format, identifies the terminal to which the packet belongs by the VID field, and identifies the service flow to which the packet belongs by using the CoS field.
- TPID: 0x88A8 is the TPID value defined by IEEE802.1 ad for the service provider label and is the label at the outermost layer.
- CoS bit In the IEEE 802.1 ad definition, this bit is used to specify the priority of the packet according to IEEE802.1 p. However, the radio interface module not only uses it to indicate the priority, it can be used as a service flow matching identifier or as a priority identifier of the service flow. CoS is used in conjunction with VID to identify which C-DOCSIS service flow the packet belongs to. The RF interface module does not determine the QoS of the data stream based on the value of the bit. The priority of the data stream and other QoS parameters are specified by the TLV encoding field of the associated control information during the C-DOCSIS service flow establishment process.
- CFI bit This bit is zero.
- VID This value should be set between 0x801 and 0x9D0, and the lower 9 bits are the terminal identifier CM lndex. Regardless of the flow of data, its value is constant for a particular terminal. In fact, there is a one-to-one correspondence between the terminal index and the MAC address of the terminal.
- the CDT label defines the identification format of the data plane between the classification and forwarding module of the coaxial cable broadband access service system and the radio interface module. It is used to identify the traffic flow of the data link between the function of the classful forwarding module and the radio interface module.
- the terminal and service flow to which the packet belongs are identified by a combination of VID and CoS. Each pair of VID and CoS values corresponds to a unique service flow for a given terminal.
- the values of the VID and CoS corresponding to a service flow are determined by a system control module when the service flow is established and activated. For the same terminal, regardless of the data flow direction, the system control module always selects the same VID value, and different CoS determines different service flows. Specific CoS values can be used both upstream and downstream. How many different CoS options, the same VID value can be used in each of the upstream traffic and the downstream traffic.
- the system control module selects different CoS values for different traffic flows, even if these flows have the same C-DOCSIS allocation priority. For example, a terminal simultaneously serves two voice streams of the same level. Although the two streams have the same C-DOCSIS priority and other QoS parameter settings, the system control module selects different CoS values for them.
- the RF interface module prioritizes the flow only based on the C-DOCSIS specific QoS parameters.
- the radio interface module inserts a corresponding CDT tag in the DOCSIS frame header of the data packet to identify the terminal to which it belongs and Traffic, of course, other Ethernet VLAN tags can also exist at the same time, but when the packet leaves the RF interface module, the CDT tag should be the outermost tag.
- the classification forwarding module can map the CDT label to the service identifier supported by the aggregation network, for example, the service VLAN, the IP ToS, and the LLID of the EPON system, so as to support the QoS in the aggregation network.
- the radio interface module allocates bandwidth according to the C-DOCSIS QoS parameters corresponding to the traffic flow.
- the RF interface module adds CDT tags to all received packets.
- the CDT tag contains the VID and CoS values corresponding to the traffic carried by the packet.
- the CoS value in the CDT tag does not affect the bandwidth allocated by the RF interface module or the processing after it is received.
- the radio interface module does not interpret the CoS bit as a priority setting, other devices in the system may determine the priority of the packet based on the CoS bit in the CDT tag, for example between the radio interface module and the class forwarding module.
- the network device can prioritize the data packet. For example, in a network, a Layer 2 switching module between a classful forwarding module and a radio interface module may prioritize CoS bits according to IEEE802.1p. For example, 0 represents the lowest priority and 7 represents the highest. priority. To accommodate these network devices, CoS bits that reflect the priority of the stream can be selected, for example, to select a relatively high CoS value for a high C-DOCSIS priority stream and a relatively low CoS value for a low C-DOCSIS priority stream.
- the VID field has a one-to-one correspondence with the MAC address of the terminal, and the mapping table of the VID field and the MAC address of the terminal may be separately stored in the radio interface module and the classification forwarding module.
- the radio frequency interface module searches the mapping table, and obtains a corresponding VID value according to the source MAC address of the data packet frame header; in the downlink data transmission direction, the classification forwarding module searches the mapping table. And obtaining a corresponding VID value according to the destination MAC address of the frame header of the data packet.
- the classification forwarding module may first classify the data packets transmitted by the aggregation network according to the classifier information defined in the configuration file or the dynamic service flow signaling, and insert the corresponding CDT in the Ethernet frame header of the data packet.
- the label identifies the terminal and service flow to which it belongs and sends it to the radio interface module.
- the radio interface module identifies the terminal and service flow to which the data packet belongs according to the CDT tag, and performs traffic according to the QoS parameter defined in the configuration file or dynamic service flow signaling. Shaping and scheduling forwarding.
- the classifier For data streams in the downstream data transmission direction, the classifier should be added to each unicast packet.
- a CDT tag to indicate the traffic flow used when the packet is transmitted.
- the packet can also contain an Ethernet VLAN tag, in which case the CDT tag should be the outermost tag.
- the radio interface module schedules the transmit queue based on the C-DOCSIS QoS parameters of the corresponding traffic flow.
- the information interaction between the radio interface module and the classifying forwarding module and the CDT tag management are controlled by the system control module, and the system control module creates, changes, and deletes the matching relationship between the VID field and the CoS field.
- the system control module uses CDMM information to convey the VID and CoS values corresponding to a traffic flow that occurs when the traffic flow is created or activated.
- the radio frequency interface module transmits CDMM management information including a terminal to which the data packet belongs and a VID field and a CoS field corresponding to the service flow to the system control module, where the system control module uses the CDMM management information to associate the terminal and the service to which the data packet belongs.
- the VID field and the CoS field of the stream are encapsulated into the CDT tag and transmitted to the class forwarding module.
- the cancellation of the VID+CoS field associated with the service flow is also implemented by the CDMM information of the control module. It can cancel the association between the VID+CoS and the service flow without deleting the service flow, so that the VID+CoS value can be reused.
- the marking method of the present invention is a method for identifying services and users in the uplink and downlink data streams between the classification forwarding module and the radio frequency interface module, to support loose coupling between the two modules, and to solve C - DOCSIS service flow
- the classification forwarding and priority mapping of the upper layer aggregation network makes the architecture application more flexible, and at the same time realizes the distributed architecture of the C-DOCSIS system and ensures the interoperability between C-DOCSIS components of different vendors.
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Abstract
本发明提出了一种同轴电缆宽带接入业务数据流的标记方法,包括:在上行方向:终端将数据包传送到射频接口模块;射频接口模块在数据包的数据帧头部插入一个CDT标签;射频接口模块将数据包传送到分类转发模块;分类转发模块将CDT标签映射到汇聚网所支持的业务标记;在下行方向:分类转发模块将汇聚网传送的数据包的以太网帧头部插入一个CDT标签;分类转发模块将数据包传送给射频接口模块;射频接口模块接收数据包,根据CDT标签识别数据包所属的终端和业务流,并将数据包传送到相应的终端;CDT标签包括CoS字段和VID字段,CoS字段和CoS字段相结合指定特定终端的特定业务流。本发明支持分类转发模块与射频接口模块之间的松耦合连接,并解决C-DOCSIS业务流向上层汇聚网络的分类转发和优先级映射问题。
Description
说 明 书
一种同轴电缆宽带接入业务数据流的标记方法 技术领域
本发明涉及通信领域,特别涉及在 C-DOCSIS接入系统架构下,一种同 轴电缆宽带接入业务数据流的标记方法。 背景技术
C-DOCSIS标准是由中国广电总局为解决国内下一代宽带接入技术和双 向网络改造问题,基于 DOCSIS 3.0标准技术,结合国内无源光网络 (PON)、 混合光铜网 (HFC)、边缘宽带接入网等实际情况,而制定的中国 DOCSIS技术 标准。
C-DOCSIS 系统头端由射频接口模块、 分类转发模块和系统控制模块构 成。 其中 C-DOCSIS接入系统架构下的分类转发模块与射频接口模块之间需 要对上下行方向的业务流进行标识,为业务包在汇聚层和射频接口模块内进行 QoS 处理提供支持。 分类转发模块与射频接口模块之间的松耦合可以支持 C-DOCSIS接入系统的分布式实现并保证不同厂商 C-DOCSIS部件之间的互 通性。
现有技术中的 DOCSIS系统设计没有提供这个标准的接口 ,所以不能支 持分类转发模块与射频接口模块基于标准互通性的分布式实现。同时如何实现 对 DOCSIS上下行业务流的业务区分和对每用户每业务流的数据标记,并向 上层汇聚网络(特别是无源光网络 PON网络)进行业务流的分类转发和优先 级映射, 目前传统的 DOCSIS系统中没有相关应用和规范,难以解决在现有 PON网络上进行 DOCSIS业务流进行分类转发和优先级映射等技术问题。 发明内容
为解决上述现在技术的问题之一,本发明提供了一种同轴电缆宽带接入业 务数据流的标记方法,这是一种在分类转发模块与射频接口模块之间对上下行 方向的数据流进行业务和用户进行标识的方法,以支持这两个模块之间的松耦
合连接,并解决 C-DOCSIS业务流向上层汇聚网络的分类转发和优先级映射 问题,使得架构应用更为灵活,同时可实现 C-DOCSIS系统的分布式架构及 保证不同厂商的 C-DOCSIS部件之间的互通性。
本发明的一种同轴电缆宽带接入业务数据流的标记方法,包括: 在上行数据传输方向 :
终端将进行了数据分类和流量整形的数据包传送到射频接口模块; 射频接口模块在所述数据包的数据帧头部插入一个 CDT标签; 所述射频接口模块将所述数据包传送到分类转发模块;
所述分类转发模块将所述 CDT标签映射到汇聚网所支持的业务标记; 在下行数据传输方向 :
分类转发模块将汇聚网传送的数据包的以太网帧头部插入一个 CDT标
;
所述分类转发模块将所述数据包传送给射频接口模块;
所述射频接口模块接收所述数据包,根据所述 CDT标签识别数据包所属 的终端和业务流,并将所述数据包传送到相应的终端;
其中 ,所述 CDT标签包括 CoS字段和 VID字段,所述 CoS字段为业务 流参考标识,所述 VID字段为终端标识,所述 CoS字段和所述 CoS字段相结 合指定特定终端的特定业务流,优选的,所述 CDT标签还包括 TPID字段, 所述 TPID字段为一特定的固定值,用于标记该数据包在射频接口模块与分类 转发模块之间传送。
优选的 ,所述 CoS字段与所述数据包的优先级具有对应关系;以便射频 接口模块和分类转发模块之间的网络设备对该数据包进行优先级调度。
优选的 ,射频接口模块与分类转发模块之间的信息交互和 CDT标签管理 由系统控制模块控制,所述射频接口模块将包含数据包所属终端和业务流的 VID字段和 CoS字段对应关系的 CDMM管理信息传送给系统控制模块,所述 系统控制模块使用所述 CDMM管理信息将数据包所属终端和业务流的 VID字 段和 CoS字段封装所述 CDT标签传送给所述分类转发模块。
优选的 ,在所述射频接口模块和分类转发模块中分别存储所述 VID 字段 和所述终端的 MAC地址的映射表。
优选的 ,还包括在上行数据传输方向 ,所述射频接口模块查找所述映射表, 根据所述数据包帧头的源 MAC地址获得对应的 VID值;在下行数据传输方向 , 所述分类转发模块查找所述映射表,根据所述数据包的帧头的目的 MAC地址 获得对应的 VID值。
本发明提供的一种同轴电缆宽带接入业务数据流的标记方法,是一种在分 类转发模块与射频接口模块之间对上下行方向的数据流进行业务和用户进行 标识的方法,以支持这两个模块之间的松耦合连接,并解决 C-DOCSIS业务 流向上层汇聚网络的分类转发和优先级映射问题,使得架构应用更为灵活,同 时可实现 C-DOCSIS系统的分布式架构及保证不同厂商的 C-DOCSIS部件之 间的互通性。 附图说明
本发明上述的和 /或附加的方面和优点从下面结合附图对实施例的描述中 将变得明显和容易理解,其中 :
图 1 为本发明的一种同轴电缆宽带接入业务数据流的标记方法的在上行 传输方向的流程图 ;
图 2 为本发明的一种同轴电缆宽带接入业务数据流的标记方法的在下行 传输方向的流程图 ;
图 3为本发明的 CDT标签的格式示意图 ;
图 4为 C-DOCSIS系统结构示意图。 具体实施方式
下面详细描述本发明的实施例,所述实施例的示例在附图中示出,其中自 始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元 件。 下面通过参考附图描述的实施例是示例性的,仅用于解释本发明 ,而不能 解释为对本发明的限制。
图 1 和图 2为本发明的一种同轴电缆宽带接入业务数据流的标记方法的 流程图 ,图 4为 C-DOCSIS系统结构示意图。
参看图 1和图 4 ,在上行数据传输方向 :步骤 1 ,终端 74将进行了数据
分类和流量整形的数据包传送到射频接口模块 71 ;步骤 2 ,射频接口模块 71 在所述数据包的数据帧头部插入一个 CDT标签;步骤 3 ,所述射频接口模块 71将所述数据包传送到分类转发模块 73;步骤 4 ,所述分类转发模块 73将 所述 CDT标签映射到汇聚网所支持的业务标记。
参看图 2和图 4 ,在下行数据传输方向 :步骤 1 ,分类转发模块 73将汇 聚网传送来的数据包的以太网帧头部插入一个 CDT标签;步骤 2 ,所述分类 转发模块 73将所述数据包传送给射频接口模块 71 ;步骤 3 ,所述射频接口模 块 71接收所述数据包,根据所述 CDT标签识别数据包所属的终端 74和业务 流,并将所述数据包传送到相应的终端 74。
其中 ,所述 CDT标签包括 CoS字段和 VID字段,所述 CoS字段为业务 流参考标识,所述 VID字段为终端标识,所述 CoS字段和所述 CoS字段相结 合以指定特定终端的特定业务流。
本发明的标记方法是一种在分类转发模块与射频接口模块之间对上下行 方向的数据流进行业务和用户进行标识的方法,以支持这两个模块之间的松耦 合连接,并解决 C-DOCSIS业务流向上层汇聚网络的分类转发和优先级映射 问题,使得架构应用更为灵活,同时可实现 C-DOCSIS系统的分布式架构及 保证不同厂商的 C-DOCSIS部件之间的互通性。 所述业务标记方法通过对业 务转发模块与射频接口模块之间的上下行方向业务流采用 CDT标签进行统一 格式标记,并为业务转发模块与多个不同射频接口模块之间的业务数据流处理 提供了统一的标准接口协议。
所述 CDT标签还包括 TPID字段,所述 TPID字段为一特定的固定值, 用于标记该数据包是在射频接口模块与分类转发模块之间传送的。
CDT标签的具体格式,如图 3所示,所述 CDT标签包括 32字节,其中 , VID字段为第 0-1 1字节、 CFT bit字段为第 12字节,其固定值为 0、 CoS字 段为第 13-15字节、 TPID字段为第 16-31 字节,其固定值为 0χ88Α8 ,用于 标记该数据包在射频接口模块与分类转发模块之间传送。 CDT 使用与 802.1 P/Q VLAN标签格式相吻合的格式,用 VID字段标识数据包所属的终端, 用 CoS字段标识数据包所属的业务流。
更进一步的, CDT标签各字段定义如下:
TPID: 0x88A8是 IEEE802.1 ad为服务提供者标签定义的 TPID值,是位 于最外层的标签。
CoS 位 : 在 IEEE 802.1 ad 定义中 , 该位被用来指定该数据包依据 IEEE802.1 p规定的优先级。 但是射频接口模块并不仅用它来指示优先级,它 既可作为业务流匹配标识,也可作为业务流的优先级标识。 CoS与 VID结合 使用 ,来标识该数据包属于哪一个终端的哪一个 C-DOCSIS业务流。 射频接 口模块并不根据该位的值来决定数据流的 QoS ,数据流的优先级及其它 QoS 参数的设置是在 C-DOCSIS业务流建立过程中由相关的控制信息的 TLV编码 字段指定的。
CFI bit: 此位为零。
VID: 此值应设在 0x801与 0x9D0之间 ,低 9位是终端标示符 CM lndex。 无论数据流向 ,对于某特定的终端其值是不变的。 实际上,终端 Index与终端 的 MAC地址存在一一对应关系。
CDT标签定义了同轴电缆宽带接入业务系统的分类转发模块与射频接口 模块之间数据平面的标识格式。它被用来识别在分类转发模块功能与射频接口 模块之间数据链路的业务流。 数据包所属的终端和业务流是由 VID与 CoS的 组合来标识的。每一对 VID和 CoS的值都对应一个指定终端的唯一的业务流。 对应于某个业务流的 VID和 CoS的值,是在该业务流被建立并激活时由一个 系统控制模块决定的。对同一个终端而言,无论数据流向 ,系统控制模块总是 会选择同一个 VID值,而不同的 CoS则决定了不同的业务流。特定的 CoS值 即可在上行也可在下行使用。 有多少个不同的 CoS选择,同一个 VID值就可 以在上行业务流和下行业务流中各使用多少次。
对于同一个终端的相同方向的流,系统控制模块会为不同的业务流选择不 同的 CoS值,即使这些流具有相同的 C-DOCSIS分配优先级。 例如,某个终 端同时服务两个同级别的语音流,尽管这两个流具有相同的 C-DOCSIS优先 级及其它 QoS参数设置,系统控制模块也为它们选择不同的 CoS值。射频接 口模块只根据 C-DOCSIS特定的 QoS参数对流进行优先级处理。
更具体的,在上行数据传输方向 ,数据分类和流量整形由终端完成,射频 接口模块在数据包的 DOCSIS帧头部插入相应的 CDT标签标识其所属终端和
业务流,当然其他以太网 VLAN 标签也可以同时存在,但当数据包离开射频 接口模块时,CDT标签应是最外层的一个标签。分类转发模块可以将 CDT标 签向汇聚网所支持的业务标记,例如:业务 VLAN、 IP ToS、 EPON 系统的 LLID进行映射,以便支持汇聚网中的 QoS。
射频接口模块根据业务流所对应的 C-DOCSIS QoS参数分配带宽。 射频 接口模块把收到的所有的数据包都加上 CDT标签。 CDT标签包含了对应于承 载数据包业务流的 VID和 CoS值。 CDT标签中的 CoS值并不会影响到射频 接口模块分配带宽或对它接收后的处理。
尽管射频接口模块不把 CoS位解释为优先级的设置,但系统中的其他设 备可能会根据 CDT标签中的 CoS位来确定数据包的优先级,以便例如射频接 口模块和分类转发模块之间的网络设备可以对该数据包进行优先级调度。 例 如,在网络中 ,一个位于分类转发模块与射频接口模块之间的二层交换模块可 能会依据 IEEE802.1 p 对 CoS位进行优先级判断,例如, 0代表最低优先级, 而 7则代表最高优先级。为适应这些网络设备,可以选择相对反映流优先级的 CoS 位,例如,为高 C-DOCSIS 优先级流选择相对高的 CoS 值,而为低 C-DOCSIS优先级流选择相对低的 CoS值。
特别地,所述 VID字段与与终端的 MAC地址存在一一对应关系,可以在 所述射频接口模块和分类转发模块中分别存储所述 VID 字段和所述终端的 MAC地址的映射表。
在上行数据传输方向 ,所述射频接口模块查找所述映射表,根据所述数据 包帧头的源 MAC地址获得对应的 VID值;在下行数据传输方向 ,所述分类转 发模块查找所述映射表,根据所述数据包的帧头的目的 MAC地址获得对应的 VID值。
在下行数据传输方向 ,分类转发模块可以首先依据配置文件或动态业务流 信令中定义的分类器信息,对汇聚网传送的数据包进行分类,在数据包的以太 网帧头部插入相应的 CDT标签,标识其所属的终端和业务流,发送给射频接 口模块,射频接口模块根据 CDT标签识别数据包所属终端和业务流,并根据 配置文件或动态业务流信令中定义的 QoS参数,进行流量整形和调度转发。
对下行数据传输方向的数据流而言,分类器应在每个单播数据包上加上
CDT标签,来标示该数据包传送时所使用的业务流。 当然该数据包也可以同 时包含以太网 VLAN标签,在这种情况下 CDT标签应是最外层的标签。
更具体的,所有在 CDT标签中具有同一对 VID和 CoS值的数据包都会 被按顺序放在同一队列中。 射频接口模块根据相应业务流的 C-DOCSIS QoS 参数来安排发送队列。
更具体而言,射频接口模块与分类转发模块之间的信息交互和 CDT标签 管理由系统控制模块控制, 由所述系统控制模块创建、 变更和删除 VID 字段 和 CoS字段的匹配关系。系统控制模块使用 CDMM信息来传递对应于某业务 流的 VID以及 CoS值,这些信息交互发生在业务流创建或激活的时候。 所述 射频接口模块将包含数据包所属终端和业务流的 VID字段和 CoS字段对应关 系的 CDMM 管理信息传送给系统控制模块,所述系统控制模块使用所述 CDMM管理信息将数据包所属终端和业务流的 VID字段和 CoS字段封装成所 述 CDT标签传送给所述分类转发模块。 VID+CoS字段与业务流关联的取消也 是通过控制模块的 CDMM信息实现的 ,它可以在不删除业务流的情况下取消 VID+CoS与业务流的关联,以便 VID+CoS值可以重新使用。
本发明的标记方法是一种在分类转发模块与射频接口模块之间对上下行 方向的数据流进行业务和用户进行标识的方法,以支持这两个模块之间的松耦 合连接,并解决 C-DOCSIS业务流向上层汇聚网络的分类转发和优先级映射 问题,使得架构应用更为灵活,同时可实现 C-DOCSIS系统的分布式架构及 保证不同厂商的 C-DOCSIS部件之间的互通性。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通 技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰, 这些改进和润饰也应视为本发明的保护范围。
Claims
1.一种同轴电缆宽带接入业务数据流的标记方法,其特征在于,包括: 在上行数据传输方向 :
终端将进行了数据分类和流量整形的数据包传送到射频接口模块; 射频接口模块在所述数据包的数据帧头部插入一个 CDT标签;
所述射频接口模块将所述数据包传送到分类转发模块;
所述分类转发模块将所述 CDT标签映射到汇聚网所支持的业务标记; 在下行数据传输方向 :
分类转发模块将汇聚网传送的数据包的以太网帧头部插入一个 CDT标
;
所述分类转发模块将所述数据包传送给射频接口模块;
所述射频接口模块接收所述数据包,根据所述 CDT标签识别数据包所属 的终端和业务流,并将所述数据包传送到相应的终端;
其中 ,所述 CDT标签包括 CoS字段和 VID字段,所述 CoS字段为业务 流参考标识,所述 VID字段为终端标识,所述 CoS字段和所述 CoS字段相结 合指定特定终端的特定业务流。
2. 根据权利要求 1所述的标记方法,其特征在于,所述 CDT标签还包括 TPID字段,所述 TPID字段为一特定的固定值,用于标记该数据包在射频接 口模块与分类转发模块之间传送。
3. 根据权利要求 1所述的标记方法,其特征在于,所述 CDT标签包括 32 字节,其中 , VID字段为第 0-11字节、 CoS字段为第 13-15字节、 TPID字段 为第 16-31字节,其固定值为 0x88A8。
4. 根据权利要求 1 所述的标记方法,其特征在于,对于方向相同且属于 同一个终端的业务流所述 CoS字段的取值不同。
5. 根据权利要求 4所述的标记方法,其特征在于,所述射频接口模块和 分类转发模块使用所述 CoS字段匹配数据包所属的业务流。
6. 根据权利要求 5所述的标记方法,其特征在于,所述 CoS字段与所述 数据包的优先级具有对应关系;以便射频接口模块和分类转发模块之间的网络 设备对该数据包进行优先级调度。
7. 根据权利要求 1 所述的标记方法,其特征在于,在所述上行数据传输 方向 ,所述射频接口模块根据所述数据包所属的业务流对应的 QoS参数分配
8. 根据权利要求 1 所述的标记方法,其特征在于,所述终端为电缆调制 ft?调^ S o
9. 根据权利要求 1 所述的标记方法,其特征在于,射频接口模块与分类 转发模块之间的信息交互和 CDT标签管理由系统控制模块控制,所述射频接 口模块将包含数据包所属终端和业务流的 VID 字段和 CoS 字段对应关系的 CDMM管理信息传送给系统控制模块,所述系统控制模块使用所述 CDMM管 理信息将数据包所属终端和业务流的 VID字段和 CoS字段封装所述 CDT标签 传送给所述分类转发模块。
10. 根据权利要求 1所述的标记方法,其特征在于,还包括:在所述射频 接口模块和分类转发模块中分别存储所述 VID字段和所述终端的 MAC地址的 映射表。
11. 根据权利要求 10所述的标记方法,其特征在于,还包括在上行数据 传输方向 ,所述射频接口模块查找所述映射表,根据所述数据包帧头的源 MAC 地址获得对应的 VID值;在下行数据传输方向 ,所述分类转发模块查找所述 映射表,根据所述数据包的帧头的目的 MAC地址获得对应的 VID值。
12. 根据权利要求 1所述的标记方法,其特征在于,在系统控制模块中创 建、 变更和删除 VID字段和 CoS字段的匹配关系。
13. 根据权利要求 1所述的标记方法,其特征在于,在下行数据传输方向 , 所述分类转发模块首先对所述汇聚网传送的数据包进行分类。
14.一种如权利要求 1 所述的标记方法,其特征在于,所述汇聚网所支持 的业务标记包括业务 VLAN , IP服务类型( IP ToS )和 EPON系统的逻辑链路 标记 ( LLTD )。
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