Time and wavelength division multiplexed passive optical network resource allocation mechanism based on linear prediction

A time division wavelength division multiplexing, passive optical network technology, applied in the field of passive optical networks, can solve the problem of large end-to-end delay of data frames, and achieve the effect of reducing packet delay, avoiding improvement, and ensuring scientificity

Inactive Publication Date: 2015-01-28
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Therefore, the end-to-end delay of the data frame is relatively large

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  • Time and wavelength division multiplexed passive optical network resource allocation mechanism based on linear prediction
  • Time and wavelength division multiplexed passive optical network resource allocation mechanism based on linear prediction
  • Time and wavelength division multiplexed passive optical network resource allocation mechanism based on linear prediction

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Embodiment Construction

[0020] 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. The system resource allocation mechanism algorithm based on flow prediction in the TWDM-PON system of the embodiment of the present invention comprises the following steps:

[0021] Step 1: The ONU sends a REPORT frame up in its own polling period, and the frame header contains the size of the buffered data in the buffer at this time.

[0022] Step 2: After receiving the REPORT frame, the OLT executes the following prediction algorithm to predict its traffic.

[0023]

[0024] where α is the adaptive weight coefficient, and L determines the prediction bandwidth determined by the previous "several" observations. The weight coefficient is calculated by the least mean algorithm (LMS):

[0025] α i , j ( ...

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Abstract

The invention discloses a time and wavelength division multiplexed passive optical network resource allocation mechanism based on flow prediction and belongs to the technical field of passive optical networks in access networks. According to the mechanism, when an OLT authorizes a bandwidth request of an ONU, wavelength allocation is conducted with the earliest free wavelength priority algorithm firstly, then allocation of time slot bandwidths on each wavelength is conducted with the linear prediction algorithm, and prediction bandwidth and the required bandwidth of an uplink REPORT frame of the ONU are authorized to the ONU together. In this way, data newly reaching the ONU can be considered as much as possible in the whole request-authorization process, so that the data are sent in the same period instead of waiting to be sent in the next period, and then packet delay can be reduced as much as possible.

Description

technical field [0001] The invention relates to a time division wavelength division multiplexing passive optical network (TWDM-PON, Time and Wavelength Division Multiplexed-PON) resource allocation mechanism based on linear prediction, and belongs to the technical field of passive optical network (PON, Passive Optical Network). Background technique [0002] In the existing optical network, the access network has become the "bottleneck" of the entire communication network. How to solve this "bottleneck" problem has become the focus of attention of experts and scholars as well as major equipment manufacturers and operators. Under such circumstances, passive optical network (PON) technology has begun to surface, and it has brought high expectations to people to solve this problem with its advantages. [0003] Passive Optical Network (PON) is a tree-structured all-fiber distribution network, which consists of an optical line terminal (OLT) at the central office, an optical netw...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J3/16H04J14/02
Inventor 王宏祥梁洋洋纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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