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Service forwarding and priority mapping method for China-data over cable system interface specification (C-DOCSIS) system

A mapping method and service forwarding technology, applied in the field of service forwarding and priority mapping, can solve the problems of narrowing user coverage, expensive CMTS equipment, and rising network transformation costs.

Inactive Publication Date: 2012-07-04
国家广播电影电视总局广播电视规划院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional CMTS equipment is expensive. If traditional CMTS equipment is used to provide large-bandwidth services, it is necessary to continuously split optical nodes and reduce user coverage, which will inevitably lead to an increase in network reconstruction costs.

Method used

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  • Service forwarding and priority mapping method for China-data over cable system interface specification (C-DOCSIS) system
  • Service forwarding and priority mapping method for China-data over cable system interface specification (C-DOCSIS) system
  • Service forwarding and priority mapping method for China-data over cable system interface specification (C-DOCSIS) system

Examples

Experimental program
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no. 1 example

[0026] In order to solve the problem of packet aggregation and forwarding by the head-end equipment of the C-DOCSIS system, and the mapping of business flows and VLAN IDs and priorities. According to the first embodiment of the present invention, the C-DOCSIS head-end equipment is moved down to the cable TV optical node, but the C-DOCSIS head-end equipment is still a centralized equipment. Such as figure 1 As shown, according to this embodiment, in the uplink direction: the C-DOCSIS head end analyzes the received C-DOCSIS frame; the C-DOCSIS head end converts the C-DOCSIS frame data payload according to the control field of the C-DOCSIS frame header Convert it into a standard Ethernet frame structure and send it uplink, wherein, when the C-DOCSIS headend converts the standard Ethernet frame structure, it performs VLAN information mapping on the C-DOCSIS frame, and the VLAN information mapping includes a VLAN ID mapping and VLAN priority mapping.

[0027] For VLAN ID mapping,...

no. 2 example

[0036] According to the second embodiment of the present invention, the radio frequency interface module in the C-DOCSIS head-end equipment is moved down to the cable TV optical node to form a distributed C-DOCSIS system. In the distributed C-DOCSIS system, the data channel can be divided into two parts: the radio frequency interface module and the classification and forwarding module. The radio frequency interface module is responsible for the PHY layer and MAC layer functions of the C-DOCSIS system, and the classification and forwarding module is responsible for the classification of the downlink data flow and the forwarding function of the uplink data flow. The classification forwarding module and the radio frequency interface module can be respectively distributed in independent devices, and communicate with each other using the CDT interface specification.

[0037] Such as Figure 7 As shown, in the distributed C-DOCSIS system, the service forwarding and priority mapping...

no. 3 example

[0049] According to the third embodiment of the present invention, the radio frequency interface module in the C-DOCSIS head-end equipment is moved down to the cable TV optical node to form a distributed C-DOCSIS system. The difference from the second embodiment is that the radio frequency interface module is only used for uplink C-DOCSIS frame analysis and downlink C-DOCSIS frame formation, and the function of VLAN information mapping is realized by the classifying and forwarding module.

[0050] Such as Figure 9 As shown, in the distributed C-DOCSIS system, the service forwarding and priority mapping methods are as follows.

[0051] In the uplink direction: the radio frequency interface module parses the received C-DOCSIS frame, and adds a CDT label to the frame; sends the frame to the classification and forwarding module, and the classification and forwarding module performs frame classification on the frame , and then convert the frame into a standard Ethernet frame stru...

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Abstract

The invention discloses a service forwarding and priority mapping method for a China-data over cable system interface specification (C-DOCSIS) system. The method comprises the following steps that: in an uplink direction, a C-DOCSIS head end resolves received C-DOCSIS frames; the C-DOCSIS head end converts the data payload of the C-DOCSIS frames into a standard Ethernet frame structure according to the control field of C-DOCSIS frame headers and performs uplink transmission on the frames, wherein the C-DOCSIS head end performs virtual local area network (VLAN) information mapping on the C-DOCSIS frames when performing standard Ethernet frame structure conversion, and the VLAN information mapping comprises VLAN identity (VLAN ID) mapping and VLAN priority mapping; in a downlink direction, the C-DOCSIS head end performs VLAN TAG information stripping on received Ethernet frames; and the C-DOCSIS head end performs data flow feature matching on the Ethernet frames, performs frame classification, quality of service (QoS) scheduling and forwarding on the Ethernet frames according to matched data flow features, the Ethernet frames are encapsulated into C-DOCSIS data frames, and the C-DOCSIS head end performs downlink transmission on the C-DOCSIS data frames. By the method, delivery of service identification and service priority is realized, and service identification information and service priority information can be reserved when the C-DOCSIS head end bridges a C-DOCSIS and a gathering network.

Description

technical field [0001] The invention relates to the communication field, in particular to a service forwarding and priority mapping method under the framework of a C-DOCSIS access system. Background technique [0002] On the traditional fiber-optic coaxial cable hybrid network (HFC), using the CMTS (Cable Modem Terminal Systems) and CM (Cable Modem) equipment of the C-DOCSIS technology system, using ITU-T J.122, J.222 and other protocol systems, It can realize broadband data transmission based on HFC network. [0003] C-DOCSIS systems have been deployed in some large and medium-sized cities in China to develop two-way services. With the large-scale operation of triple play services, the cable TV access network needs to meet the operation requirements of large bandwidth service bearer, multi-service QoS guarantee, operability and manageability. Traditional CMTS equipment is expensive. If traditional CMTS equipment is used to provide large-bandwidth services, it is necessary...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L12/46H04L12/56H04L47/31
CPCH04L12/4645H04L12/4666H04L12/4641
Inventor 欧阳世杰沈承虎李忠炤潘稻杨家胜罗晓令张利秦龑龙
Owner 国家广播电影电视总局广播电视规划院
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