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Method for realizing efficient video multicasting in ethernet passive optical entwork system

The technology of a passive optical network and its implementation method is applied in the field of high-efficiency video multicast, which can solve problems such as the reduction of downlink bandwidth utilization, and achieve high QoS guarantees, improved utilization, and high-efficiency video multicast

Active Publication Date: 2006-03-08
CHINA TELECOM CORP LTD
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AI Technical Summary

Problems solved by technology

In a word, the two methods of Proxy / Snooping of the IGMP protocol used in the current EPON system all need to copy a video service flow for each user joining the multicast group on the OLT (see figure 1 ), so that the utilization rate of the downlink bandwidth is significantly reduced

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  • Method for realizing efficient video multicasting in ethernet passive optical entwork system
  • Method for realizing efficient video multicasting in ethernet passive optical entwork system
  • Method for realizing efficient video multicasting in ethernet passive optical entwork system

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The train of thought or starting point of the high-efficiency multicast implementation method of the present invention is: in the EPON system, the multipoint control protocol MPCP (multi point control protocol) of the MAC control sublayer is the core and foundation. MPCP controls the topological structure of the access point to many points through messages, state machines and timers. The content involved in MPCP includes the allocation of ONU sending time slots, the automatic discovery and joining of ONUs, and the reporting of congestion conditions to the upper layers in order to dynamically allocate bandwidth.

[0039] In the point-to-multipoint topology of the EPON system, each ONU contains an MPCP entity, which can exchange messages with the MPCP entity ...

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Abstract

The disclosed method is realized based on video multicast by using Internet group management protocol (IGMP) Proxy / Snooping. The method includes following operations: (1) for each optical network unit (ONU), the system defines their ID i.e. ONU ID, and defines each multicast ID for multicast group of video service stream in different content; (2) using structure from point to multipoint of Ethernet passive optical network (EPON), the method combines IGMP with down going broadcast mechanism of EPON network to realize single copy multicast of same video service stream in EPON network. Overcoming disadvantages of low use ratio of multicast bandwidth, the method reproduces only one piece of video service stream for each group on OLT for users in same group share. The invention saves network bandwidth, lowers network load. Features are: easy of implementation, forward compactable and easy to realize intercommunication with multicast protocol of data network IGMP.

Description

technical field [0001] The invention relates to a method for realizing high-efficiency video multicasting in an Ethernet passive optical network system, and belongs to the technical field of broadband access communication. Background technique [0002] Ethernet Passive Optical Networks (EPON, Ethernet Passive Optical Networks) technology is an Ethernet-based and point-to-multipoint optical fiber access technology, which combines the simplicity of Ethernet technology with the high-efficiency transmission of PON, etc. The combination of features is an ideal way to realize fiber-to-the-home fiber access network in the future. [0003] The EPON system consists of an optical line terminal (OLT) at the office side, an optical network unit (ONU) at the user side, and an optical distribution network (ODN). Generally, the downlink adopts time division multiplexing (TDM) broadcast mode, and the uplink adopts time division multiple access (TDMA) mode, which can flexibly form tree, sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04N7/173
Inventor 陆立梁柏青许文秀左建任艳杜春生周荣生
Owner CHINA TELECOM CORP LTD
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