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Downlink flow control information transferring method in kilomega passive optical network system

A passive optical network and flow control information technology, which is applied in multiplexing system selection devices, transmission systems, digital transmission systems, etc., can solve problems such as inability to transmit downstream flow control information, and achieve enhanced transmission efficiency and flexibility performance, solve uplink data flow congestion, and improve the effect of control capability

Inactive Publication Date: 2008-03-12
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the main purpose of the present invention is to provide a method for transmitting downstream flow control information in a gigabit passive optical network system, so as to solve the problem that the GPON system cannot The downlink flow control information transmitted from the OLT uplink port is transmitted to the ONU, and the use of downlink flow control information to reduce the allocation of GPON's uplink bandwidth to eliminate the uplink port congestion caused when the ONU's uplink data flow exceeds the uplink port bandwidth

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  • Downlink flow control information transferring method in kilomega passive optical network system
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  • Downlink flow control information transferring method in kilomega passive optical network system

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Embodiment Construction

[0037] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0038] Figure 1 is a topological diagram of the existing gigabit passive optical network system. As shown in Figure 1, the PON port of the OLT can be connected to multiple ONUs through an optical splitter, and each ONU can carry several transmission containers (T-CONTs). , T-CONT is the basic unit of upstream flow control and bandwidth allocation in GPON system. According to the requirements for different quality of service, GPON stipulates four basic types of service bandwidth allocation methods, and their priorities are fixed bandwidth (Fixed), guaranteed bandwidth (Assured), and non-guaranteed bandwidth (Non-Assured) from high to low. And best effort bandwidth (BestEffort).

[0039] The G983.4 protocol uses four basic bandwidth types to define corresponding multiple T-CONTs to adapt to various bandwid...

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Abstract

The present invention discloses a method for the transmission of the downward flow control information in a gigabit-capable passive optical network (GPON) system. After a medium access control chip (MAC) of an optical line terminal (OLT) receives the flow control information, a transmission container bandwidth (T-CONT) prepared for each optical network unit (ONU) reduces the upward authorization time slot obtained by the T-CONT of each ONU through a dynamic alignment, thus reducing an upward band width, thereby accusing the reduction of the upward data stream of the ONU, and a flow control frame is further generated because the slow queue inside the ONU is on the increase. When the flow control frame of the ONU notifies the user to transmit upward data through a user network interface (UNI), the data packet is not dropped until the UNI accesses according to a certain strategy, thus the upward band width of the ONU is effectively reduced, and the congestion phenomenon of the data stream of the OLT uplink port is eliminated.

Description

technical field [0001] The present invention relates to a passive optical network (PON) transmission technology in the field of optical communication, in particular to a method for transmitting downstream flow control information of a gigabit-capable passive optical network (GPON, Gigabit-capable Passive Optical Network). Background technique [0002] GPON is a flexible gigabit optical fiber access network proposed by the International Telecommunication Union Telecommunication Standardization Authority (ITU-T). Encapsulated Mode) frames carry multiple services and support broadband full-service access for commercial and residential users. GPON is physically a tree topology, one optical line terminal (OLT) corresponds to multiple optical network units (ONUs), and the ONUs are centrally controlled by the OLT. [0003] The transmission mode of GPON's downstream data flow is broadcast, and all ONUs can receive all downstream data frames on their physical PON ports, and ONUs can...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/28H04B10/00H04L12/801H04Q11/00
Inventor 严技凯于金辉
Owner ZTE CORP
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