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Large request first-fair excess allocation dynamic wave length bandwidth allocation method

A technology of time division wavelength division multiplexing and wavelength, which is applied in the direction of wavelength division multiplexing system, selection device of multiplexing system, electrical components, etc., and can solve problems such as less consideration of fairness

Inactive Publication Date: 2013-11-20
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The above three scheduling algorithms of SUCCESS WDM-PON are mainly aimed at how to share tunable transceivers and available wavelengths. The focus is on improving scheduling efficiency and network throughput, and less consideration is given to fairness in scheduling.

Method used

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  • Large request first-fair excess allocation dynamic wave length bandwidth allocation method
  • Large request first-fair excess allocation dynamic wave length bandwidth allocation method
  • Large request first-fair excess allocation dynamic wave length bandwidth allocation method

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specific Embodiment approach

[0017] In order to make the object, technical scheme and advantages of the present invention clearer, the following in conjunction with the attached figure 2Embodiments of the present invention are further described in detail. The GATE and REPORT messages are both MAC control frames used in the TWDM-PON message interaction protocol. The GATE message is sent from the OLT to a separate ONU, and is used to allocate transmission time slots for the ONU. A time slot uses a transmission wavelength , the transmission start time and the length of the transmission window are represented by three numerical values; the REPORT message is a feedback mechanism for the ONU to pass the local status (such as the buffer occupancy, which can be understood as the ONU's request bandwidth in the present invention) to the OLT, and is used for Help OLT intelligently allocate time slots. The specific implementation is as follows:

[0018] (1) The ONU sends a REPORT message to the OLT to report the cu...

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Abstract

The invention discloses a large request first-fair excess (LRF-FE) allocation dynamic wave length bandwidth allocation method which is suitable for a time-and wavelength-division multiplexed passive optical network (TWDM-PON), and belongs to the technical field of optical access networks. According to the method, optical network units (ONU) transmit request bandwidths to an optical line terminal (OLT); the OLT adopts an LRF-FE algorithm to authorize all the ONUs, i.e. all the ONUs are ordered from large to small according to the request, wavelengths which are firstly not occupied are sequentially allocated to the ONUs according to the sequence, and available wavelength communication channels and initial using times of the ONUs are designated; and the OLT allocates the available bandwidths to the ONUs according to an excess quota bandwidth fair excess (FE) algorithm and designates the transmission data window for the ONUs. After an LRF wavelength allocation algorithm is applied, time fragments on wavelength communication channels can be reduced, wavelength resources can be effectively utilized, the time delay of a system can be reduced, and the resource utilization rate of the system is improved; and after an FE bandwidth allocation algorithm is applied, the system can fairly allocate resources, so that the fairness of the ONUs is realized. Consequently, an LRF-FE is an efficient and fair dynamic wavelength and bandwidth allocation algorithm.

Description

technical field [0001] The invention relates to a dynamic wavelength bandwidth allocation algorithm in a time division wavelength division multiplexing stacked optical access network, and belongs to the technical field of optical access networks. Background technique [0002] Time-and-Wavelength-Division Multiplexed Passive Optical Network (TWDM-PON) is a network formed by wavelength stacking on the basis of time-division multiplexing PON (TDM-PON). Its structure is inherited from TDM-PON, and the optical line terminal (OpticalLineTerminal, OLT) is connected to all optical network units (OpticalNetworkUnit, ONU) through an optical splitter (Splitter). From the perspective of data rate, since wavelength division multiplexing PON (WDM-PON) adopts one-to-one static wavelength allocation, the dynamic wavelength and bandwidth allocation of TWDM makes its maximum data rate higher; from a technical point of view, TWDM-PON No need to change the optical distribution network (Optical...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02H04Q11/00
Inventor 王宏祥尚智婕纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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