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Downstream data transmission method of passive optical network system

A technology of passive optical network and transmission method, which is applied in the field of downlink data transmission, can solve the problems of inapplicability of broadcast channel and lower bandwidth utilization rate, and achieve the effect of improving bandwidth utilization rate and multicast data transmission efficiency

Inactive Publication Date: 2010-01-06
ZTE CORP
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Problems solved by technology

But in PON system, in addition to broadcasting, there may also be multicasting, that is, data packets are sent to multiple ONUs instead of all ONUs (such as multiple ONUs simultaneously downloading versions). At present, in the case of multicasting, The broadcast channel cannot be applied, but can only be sent by converting to multiple unicast packets, thus reducing bandwidth utilization

Method used

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  • Downstream data transmission method of passive optical network system
  • Downstream data transmission method of passive optical network system
  • Downstream data transmission method of passive optical network system

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Embodiment Construction

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] First, the main steps of the present invention are described, specifically including:

[0021] The OLT determines the ONU that receives the multicast data packet, and notifies the multicast information to the corresponding ONUs, and the corresponding ONU records the corresponding multicast information according to the multicast information notification of the OLT.

[0022] The OLT sends multicast packets to the ONU through the broadcast channel. The multicast data packet carries the corresponding multicast information, so that the ONU can determine whether to receive the multicast data packet in combination with the local multicast information record.

[0023] The ONU determines whether to receive the multicast data packet by combining the locally recorded multicast information record and the multicast information carried in the...

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Abstract

The invention relates to a downstream data transmission method of a passive optical network system, comprising the following steps: an optical network unit for receiving a multicast data packet in the system is predetermined; an optical line terminal sends the multicast data packet to all optical network units of the system via a system broadcasting path; all optical network units only have optical network units which are determined to receive the multicast data packet to receive the multicast data packet. In the transmission method, multicast transmission is carried out by utilizing a predetermining and receiving optical network unit through the system broadcasting path, so that the phenomenon that a multi-single-cast transmission data packet is used for multicast transmission can be avoided, which effectively improves the multicast data transmission efficiency in the passive optical network system so as to improve the band width utilization ratio.

Description

technical field [0001] The invention relates to data transmission, in particular to a downlink data transmission method of a PON (Passive Optical Network, passive optical network) system. Background technique [0002] The PON system consists of OLT (Optical Line Terminal, optical line terminal), ONU (Optical Network Unit, optical network unit) and ODN (Optical Distribution Network, optical distribution network). Optical network terminal ONT is a kind of ONU, which is applied to optical fibers Home FTTH scenarios. ODN is a point-to-multipoint structure, and one OLT connects multiple ONUs through the ODN. [0003] In the PON system, the downlink data has broadcast characteristics, and the data sent by the OLT can be received by all the downlink ONUs. The ONU checks and judges whether to receive or not according to the relevant information in the downlink data frame. For example, in the Gigabit passive optical network GPON system, check GEM-PORT (GEM, GPON Encapsulation Metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/18H04L45/16
Inventor 张伟良
Owner ZTE CORP
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