WDM-OFDM-PON three dimensional bandwidth distribution method and system

A bandwidth allocation method and bandwidth allocation technology, applied in the field of WDM-OFDM-PON communication, can solve problems such as the inability to combine three multiplexing methods, and achieve the effects of convenient access, high spectrum utilization, and increased transmission rate

Active Publication Date: 2014-06-25
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a three-dimensional bandwidth allocation method and system of WDM-OFDM-PON to solve the technical problem that the three multiplexing methods cannot be combined in the prior art

Method used

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  • WDM-OFDM-PON three dimensional bandwidth distribution method and system
  • WDM-OFDM-PON three dimensional bandwidth distribution method and system
  • WDM-OFDM-PON three dimensional bandwidth distribution method and system

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Embodiment 1

[0064] Embodiment 1 of the present invention provides a three-dimensional bandwidth allocation method, see figure 1 ,include:

[0065] Step 101: determine the allocation order of each ONU;

[0066] Step 102: determine the bandwidth of each ONU;

[0067] Step 103: Allocating wavelengths to ONUs, so that the wavelength adjustment overhead and the load difference between wavelengths are the smallest;

[0068] Step 104: Allocate frequencies to the ONUs in each wavelength, so that the load difference of each frequency channel in the wavelength is the smallest and the spectrum fragmentation rate is the smallest.

[0069] It can be seen that in the three-dimensional bandwidth allocation method proposed in the embodiment of the present invention, the three multiplexing methods of wavelength division multiplexing, frequency division multiplexing and time division multiplexing can be combined to meet the characteristics of each priority service as much as possible. Make bandwidth all...

Embodiment 2

[0086] Embodiment 2 of the present invention takes the three-dimensional bandwidth allocation of the WDM-OFDM-PON system as an example to describe the implementation process of the embodiment of the present invention in detail. Refer to figure 2 :

[0087] Step 201: Determine the allocation order of each ONU.

[0088] In this step, before the three-dimensional bandwidth allocation, it is first necessary to determine the allocation sequence of each ONU. Divide each cycle into two phases: EF sub-cycle and AF / BE sub-cycle. After the AF / BE business in one cycle ends, the Report packet is sent, and then the next round of EF business starts immediately, so that the EF business does not need to Wait for the arrival of the Gate packet to reduce the EF service delay. The time when the first EF service packet arrives at the optical line terminal (OLT) is taken as the first element to determine the bandwidth allocation order of each ONU, and the reported bandwidth of each ONU is taken...

Embodiment 3

[0111] Embodiment 3 of the present invention provides a three-dimensional bandwidth allocation system, see Figure 8 ,include:

[0112] Allocation sequence unit 801, used to determine the allocation sequence of each ONU;

[0113] A bandwidth determining unit 802, configured to determine the bandwidth of each ONU;

[0114] A wavelength allocation unit 803, configured to allocate wavelengths to ONUs, so that the wavelength adjustment overhead and the load difference between wavelengths are minimized;

[0115] The frequency allocation unit 804 is configured to allocate frequencies to the ONUs within each wavelength, so that the load difference of each frequency channel within the wavelength is the smallest and the frequency spectrum fragmentation rate is the smallest.

[0116] Preferably, the allocation sequence unit 801 can also be used to: divide each cycle into two stages of EF sub-cycle and AF / BE sub-cycle, and use the time when the first packet of EF service arrives at the...

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Abstract

The invention provides a WDM-OFDM-PON three dimensional bandwidth distribution method and a system. The method comprises steps of determining a distribution order of each ONU, determining the wavelength of each ONU, performing wavelength allocation on the ONU in order to make the load difference between wavelength adjustment overhead and the wavelength be the smallest, performing frequency distribution on the ONU in each wavelength to make the load difference of each frequency channel in the wavelength and the spectrum fragment to be the smallest. The invention combines wavelength division multiplexing, frequency division multiplexing and time division multiplexing, meets the characteristics of all priorities of businesses, and makes the bandwidth change flexibly along with the network flow. The invention also has capabilities of high spectrum utilization, anti-interference between codes and anti-fading, which greatly improves the transmission speed.

Description

technical field [0001] The invention relates to the field of WDM-OFDM-PON communication, in particular to a WDM-OFDM-PON three-dimensional bandwidth allocation method and system. Background technique [0002] Wavelength Division Multiplexing PON (WDM-PON) is a passive optical network that uses wavelength division multiplexing as an access technology, and is the ultimate direction of future access networks. [0003] There are three schemes for WDM-PON: the first is that each Optical Network Unit (ONU) allocates a pair of wavelengths for uplink and downlink transmission respectively, thus providing a fixed virtual point-to-point bidirectional connection between the OLT and each ONU; The second is that the ONU uses a tunable laser, and the wavelength is dynamically allocated to the ONU according to the needs. Each ONU can share the wavelength, and the network is reconfigurable; the third is to use a colorless ONU (colorless ONU), that is, the ONU has nothing to do with the wave...

Claims

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Application Information

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IPC IPC(8): H04L12/911H04L27/26H04J14/02
Inventor 张民蒋俊刘卓王丹石王立芊
Owner BEIJING UNIV OF POSTS & TELECOMM
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