CN103888382A - WDM-OFDM-PON three dimensional bandwidth distribution method and system - Google Patents

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

Three-dimensional bandwidth allocation methods and the system of WDM-OFDM-PON

Technical field

The present invention relates to the WDM-OFDM-PON communications field, relate in particular to three-dimensional bandwidth allocation methods and the system of a kind of WDM-OFDM-PON.

Background technology

Wave division multiplexing passive optical network (Wavelength Division Multiplexing PON, WDM-PON) is to adopt the EPON of wavelength division multiplexing as access technology, is the final direction of Future Access Network.

WDM-PON has three kinds of schemes: the first is that each optical network unit (Optical Network Unit, ONU) distributes a pair of wavelength, is respectively used to uplink and downlink transmission, thereby provides OLT to the fixing virtual point-to-point two-way connection of each ONU; The second is that ONU adopts tunable laser, is ONU dynamic assignment wavelength as required, and each ONU can sharing wavelength, and network has reconfigurability; The third is to adopt colorless ONU (colorless ONU), i.e. ONU and Wavelength-independent scheme, or descending use WDM-PON, the mixing PON of up use time-division multiplex technology (time-division multiplexing PON, TDM-PON).

But, current novel PON system WDM-PON, and OFDMA-PON, TWDM-PON etc. are by the system of one or two kind of combination in three kinds of multiplex modes, in business transmission, cut both ways, and cannot embody all advantages of three kinds of multiplex modes.

Summary of the invention

(1) technical problem that will solve

The invention provides three-dimensional bandwidth allocation methods and the system of a kind of WDM-OFDM-PON, cannot be by the technical problem of three kinds of multiplex mode combinations in prior art to solve.

(2) technical scheme

For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of three-dimensional bandwidth allocation methods, comprising:

Determine the allocation order of each ONU;

Determine the bandwidth of each ONU;

ONU is carried out to Wavelength Assignment, make the poor minimum of load between wavelength regulation expense and wavelength;

ONU in each wavelength is carried out to frequency distribution, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

Further, the described allocation order of determining each ONU comprises:

Each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

Further, the described bandwidth of determining each ONU comprises:

High-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000467525700000021.png,HDA0000467525700000051.png"\; state="\{\{state\}\}">W</figure-callout>}}_{1,j}$

W _rest=B _U-W _EF；

Centering low priority traffice carries out allocated bandwidth, comprising: the bandwidth that the AF/BE business of each ONU is total is distributed; In each ONU, respectively AF and BE business are distributed.

Further, describedly ONU carried out to Wavelength Assignment comprise:

Determine wavelength regulation overhead computational formula: C _ijk=| j-i| × C _unit, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carry out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

Further, described to the ONU in each wavelength carry out frequency distribute comprise:

Each ONU determines next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, and the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

On the other hand, the present invention also provides a kind of three-dimensional allocated bandwidth system, comprising: allocation order unit, bandwidth determining unit, Wavelength Assignment unit and frequency allocation units that order is connected; Wherein:

Allocation order unit, for determining the allocation order of each ONU;

Bandwidth determining unit, for determining the bandwidth of each ONU;

Wavelength Assignment unit, for ONU is carried out to Wavelength Assignment, makes the poor minimum of load between wavelength regulation expense and wavelength;

Frequency allocation units, carry out frequency distribution for the ONU in each wavelength, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

Further, described allocation order unit also for:

Each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

Further, described bandwidth determining unit also comprises:

High priority distributes subelement: for high-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Bandwidth calculation subelement, for utilizing following formula to calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000467525700000021.png,HDA0000467525700000051.png"\; state="\{\{state\}\}">W</figure-callout>}}_{1,j}$

W _rest=B _U-W _EF；

Middle low priority distributes subelement, distributes for the total bandwidth of AF/BE business to each ONU; In each ONU, respectively AF and BE business are distributed.

Further, described Wavelength Assignment unit also comprises:

Wavelength overhead computational subelement, for utilizing formula C _ijk=| j-i| × C _unitcalculate wavelength regulation expense, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Weight calculation subelement, for calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carries out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

Further, described frequency allocation units also for:

Determine next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

(3) beneficial effect

Visible, in the three-dimensional bandwidth allocation methods and system of the WDM-OFDM-PON proposing in the embodiment of the present invention, wavelength division multiplexing, frequency division multiplexing, three kinds of multiplex modes of time division multiplexing can be combined, meet as much as possible the feature of each priority service, allocated bandwidth is changed flexibly with network traffics.The embodiment of the present invention has also been brought into play high spectrum utilization, anti-ISI and the anti-fading ability of OFDM simultaneously in the advantage of inheriting TWDM-PON, in transmission rate, be greatly enhanced.The embodiment of the present invention provides enough access bandwidths to PON system for wireless and wired integrated access, and is more convenient for the access of wireless system, is applicable to Open Access Network system.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic flow sheet of the embodiment of the present invention 1 three-dimensional bandwidth allocation methods;

Fig. 2 is the schematic flow sheet of the embodiment of the present invention 2 three-dimensional bandwidth allocation methods;

Fig. 3 is the low priority traffice total bandwidth allocation flow schematic diagram of the embodiment of the present invention 2;

Fig. 4 is the interior allocated bandwidth schematic flow sheet of the ONU of the embodiment of the present invention 2;

Fig. 5 is that the wavelength sub-band of the embodiment of the present invention 2 is counted calculation process schematic diagram;

Fig. 6 is the Wavelength Assignment schematic flow sheet of the embodiment of the present invention 2;

Fig. 7 is that the frequency domain of the embodiment of the present invention 2 distributes two-dimensional representation;

Fig. 8 is the structural representation of the three-dimensional allocated bandwidth system of the embodiment of the present invention 3.

Embodiment

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

Along with the high speed development of Digital Signal Processing, OFDM (Orthogonal Frequency Division Multiplexing, OFDM) modulation technique receives increasing concern in PON field gradually.The advantage that OFDM has other modulation systems not have, such as OFDM technology can be supported the multiplexing transmission of the information of various different terminals frameworks can also realize well Dynamic Bandwidth Allocation well.OFDM technology and wavelength division multiplexing (Wavelength Division Multiplexing, WDM), time division multiplexing (Time Division Multiplexing, TDM) technology combines is the trend of current PON structural development.Orthogonal frequency division, time division and wavelength division multiplexing passive optical network (OFTWDM-PON) is that WDM-OFDM-PON system is carried out frequency division and time-multiplexed EPON to each wavelength again on the basis of wavelength-division simultaneously.

Embodiment 1:

The embodiment of the present invention 1 provides a kind of three-dimensional bandwidth allocation methods, referring to Fig. 1, comprising:

Step 101: the allocation order of determining each ONU;

Step 102: the bandwidth of determining each ONU;

Step 103: ONU is carried out to Wavelength Assignment, make the poor minimum of load between wavelength regulation expense and wavelength;

Step 104: the ONU in each wavelength is carried out to frequency distribution, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

Visible, in the three-dimensional bandwidth allocation methods proposing in the embodiment of the present invention, wavelength division multiplexing, frequency division multiplexing, three kinds of multiplex modes of time division multiplexing can be combined, meet as much as possible the feature of each priority service, allocated bandwidth is changed flexibly with network traffics.The embodiment of the present invention has also been brought into play high spectrum utilization, anti-ISI and the anti-fading ability of OFDM simultaneously in the advantage of inheriting TWDM-PON, in transmission rate, be greatly enhanced.The embodiment of the present invention provides enough access bandwidths to PON system for wireless and wired integrated access, and is more convenient for the access of wireless system, is applicable to Open Access Network system.

Preferably, the allocation order of determining each ONU can comprise: each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

Preferably, the bandwidth of determining each ONU can comprise:

High-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000467525700000021.png,HDA0000467525700000051.png"\; state="\{\{state\}\}">W</figure-callout>}}_{1,j}$

W _rest=B _U-W _EF；

Centering low priority traffice carries out allocated bandwidth, comprising: the bandwidth that the AF/BE business of each ONU is total is distributed; In each ONU, respectively AF and BE business are distributed.

Preferably, ONU being carried out to Wavelength Assignment can comprise:

Determine wavelength regulation overhead computational formula: C _ijk=| j-i| × C _unit, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carry out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

Preferably, the ONU in each wavelength being carried out to frequency distributes and can comprise:

Each ONU determines next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, and the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

Embodiment 2:

The embodiment of the present invention 2, specifically WDM-OFDM-PON system is carried out to three-dimensional allocated bandwidth as example, describes the implementation procedure of the embodiment of the present invention in detail, referring to Fig. 2:

Step 201: the allocation order of determining each ONU.

In this step, before three-dimensional allocated bandwidth, first need to determine the allocation order of each ONU.Each cycle is all divided into EF subcycle and two stages of AF/BE subcycle, after AF/BE service ending in one-period, send Report bag, just start immediately subsequently next round EF business, make EF business need not wait for again the arrival of Gate bag, to reduce the time delay of EF business.The time that EF business first packet is arrived to optical line terminal (optical line terminal, OLT), each ONU reported bandwidth as the second key element as the first element that determines each ONU allocated bandwidth order.The EF business time delay that the epicycle that such allocation order is considered simultaneously is transmitting with also distribute bandwidth AF/BE business report bandwidth.

Step 202: high-priority service is carried out to allocated bandwidth.

In this step, first high-priority service is carried out to allocated bandwidth, concrete mode is:

Work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row.

Step 203: the total bandwidth of centering low priority traffice is carried out allocated bandwidth.

In this step, first need to calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000467525700000021.png,HDA0000467525700000051.png"\; state="\{\{state\}\}">W</figure-callout>}}_{1,j}$

W _rest=B _U-W _EF。

Then, utilize the total bandwidth of flow process centering low priority traffice of Fig. 3 to distribute, wherein R _2,3with R _{2,3 '}represent the 2nd, the 3 row all elements summations to R matrix.After first determining the total bandwidth of each ONU, by idle period buffer memory between minimum bandwidth priority allocation method and poll is monitored to combination, make when total bandwidth on demand is higher than always can distribute bandwidth time, to giving asked bandwidth lower than the ONU of average request bandwidth, the ONU that exceedes average request bandwidth can obtain average request bandwidth and can distribute bandwidth according to the residue that bandwidth on demand separately accounts for residue ONU total bandwidth ratio.And for total bandwidth on demand lower than the situation that always can distribute bandwidth, consider again the average cache of idle period between poll outward in the bandwidth of distributing to ONU request.

Step 204: carry out allocated bandwidth in each ONU.

In this step, after the total bandwidth of all ONU distributes, then carry out the second allocated bandwidth of taking turns, allocation flow is shown in Fig. 4, and wherein P2 and P3 are the priority constants of AF and BE business, consider dynamic P2 and P3 in the present embodiment.

This method of salary distribution not only ensured the justice of each ONU but also considered the traffic carrying capacity of each ONU, particularly in the time of network underload, guaranteed the rational high bandwidth of AF business in EF business low delay, and BE business can be uploaded as far as possible.Distribute more reasonable and practical.

Step 205: ONU is carried out to Wavelength Assignment, make the poor minimum of load between wavelength regulation expense and wavelength.

In this step, first determine wavelength regulation overhead computational formula: C _ijk=| j-i| × C _unit, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude.

Then calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carry out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

Fig. 5 is the calculation process of wavelength sub-band, and Fig. 6 is the algorithm flow of embodiment of the present invention Wavelength Assignment.

Step 206: the ONU in each wavelength is carried out to frequency distribution, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

In this step, by the mechanism of giving out a contract for a project in amendment ONU, be about to originally to become by the delays method of simulating transmission delay of giving out a contract for a project the generation time of revising each bag, make packet generation time advance, and process of transmitting does not have time delay, so just solve and changed the difficulty that the OFDM of the ODN place frame generated time that causes cannot be unified because bag is long.Fig. 7 is the X-Y scheme of frequency domain allocation algorithm, in figure, each little square is a benchmark bag long (70Byte), each square frame is the slot that distributes to a bag, and each ONU determines next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service.Slot allocation order is undertaken by order from left to right from top to bottom, when the slot of a certain row is assigned with the backward slot that joins next column that parts on the right side, starts to distribute successively at primary ONU from sequence.The report information of uploading according to each ONU, the long List of bag that comprises each priority service in this ONU in it shows.The loading condition of each sub-channels after distributing according to a upper ONU, select the wherein channel channel k of least-loaded, find out again in current ONU long maximum that of bag in unappropriated bag, channel k is distributed to this bag, then upgrade the loading condition of each subchannel, then continue the distribution of next bag.

So far, completed the overall process of the embodiment of the present invention 2 three-dimensional allocated bandwidth.

Embodiment 3:

The embodiment of the present invention 3 provides a kind of three-dimensional allocated bandwidth system, referring to Fig. 8, comprising:

Allocation order unit 801, for determining the allocation order of each ONU;

Bandwidth determining unit 802, for determining the bandwidth of each ONU;

Wavelength Assignment unit 803, for ONU is carried out to Wavelength Assignment, makes the poor minimum of load between wavelength regulation expense and wavelength;

Frequency allocation units 804, carry out frequency distribution for the ONU in each wavelength, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

Preferably, allocation order unit 801 can also be used for: each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

Preferably, bandwidth determining unit 802 can also comprise:

High priority distributes subelement: for high-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Bandwidth calculation subelement, for utilizing following formula to calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000467525700000021.png,HDA0000467525700000051.png"\; state="\{\{state\}\}">W</figure-callout>}}_{1,j}$

W _rest=B _U-W _EF；

Middle low priority distributes subelement, distributes for the total bandwidth of AF/BE business to each ONU; In each ONU, respectively AF and BE business are distributed.

Preferably, Wavelength Assignment unit 803 can also comprise:

Wavelength overhead computational subelement, for utilizing formula C _ijk=| j-i| × C _unitcalculate wavelength regulation expense, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Weight calculation subelement, for calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carries out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

Preferably, frequency allocation units 804 can also be used for: determine next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

Visible, the embodiment of the present invention has following beneficial effect:

In the three-dimensional bandwidth allocation methods and system of the WDM-OFDM-PON proposing in the embodiment of the present invention, wavelength division multiplexing, frequency division multiplexing, three kinds of multiplex modes of time division multiplexing can be combined, meet as much as possible the feature of each priority service, allocated bandwidth is changed flexibly with network traffics.The embodiment of the present invention has also been brought into play high spectrum utilization, anti-ISI and the anti-fading ability of OFDM simultaneously in the advantage of inheriting TWDM-PON, in transmission rate, be greatly enhanced.The embodiment of the present invention provides enough access bandwidths to PON system for wireless and wired integrated access, and is more convenient for the access of wireless system, is applicable to Open Access Network system.

Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. a three-dimensional bandwidth allocation methods, is characterized in that, comprising:

Determine the allocation order of each ONU;

Determine the bandwidth of each ONU;

ONU is carried out to Wavelength Assignment, make the poor minimum of load between wavelength regulation expense and wavelength;

ONU in each wavelength is carried out to frequency distribution, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

2. three-dimensional bandwidth allocation methods according to claim 1, is characterized in that, the described allocation order of determining each ONU comprises:

Each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

3. three-dimensional bandwidth allocation methods according to claim 2, is characterized in that, the described bandwidth of determining each ONU comprises:

High-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{W}_{1,j}$

W _rest=B _U-W _EF；

Centering low priority traffice carries out allocated bandwidth, comprising: the bandwidth that the AF/BE business of each ONU is total is distributed; In each ONU, respectively AF and BE business are distributed.

4. three-dimensional bandwidth allocation methods according to claim 3, is characterized in that, describedly ONU is carried out to Wavelength Assignment comprises:

Determine wavelength regulation overhead computational formula: C _ijk=| j-i| × C _unit, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carry out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

5. three-dimensional bandwidth allocation methods according to claim 4, is characterized in that, described to the ONU in each wavelength carry out frequency distribute comprise:

Each ONU determines next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, and the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

6. a three-dimensional allocated bandwidth system, is characterized in that, comprising: allocation order unit, bandwidth determining unit, Wavelength Assignment unit and frequency allocation units that order is connected; Wherein:

Allocation order unit, for determining the allocation order of each ONU;

Bandwidth determining unit, for determining the bandwidth of each ONU;

Wavelength Assignment unit, for ONU is carried out to Wavelength Assignment, makes the poor minimum of load between wavelength regulation expense and wavelength;

Frequency allocation units, carry out frequency distribution for the ONU in each wavelength, make the poor minimum of each frequency channels load and frequency spectrum fragment rate minimum in wavelength.

7. three-dimensional allocated bandwidth system according to claim 6, is characterized in that, described allocation order unit also for:

Each cycle is divided into EF subcycle and two stages of AF/BE subcycle, the time that EF business first packet is arrived to optical line terminal is as the first element that determines each ONU allocated bandwidth order, each ONU reports bandwidth as the second key element, to determine the allocation order of each ONU.

8. three-dimensional allocated bandwidth system according to claim 7, is characterized in that, described bandwidth determining unit also comprises:

High priority distributes subelement: for high-priority service is carried out to allocated bandwidth: work as R _{1, j}<B ₁ ^maxtime, W _{1, j}=R _{1, j}; Otherwise, W _{1, j}=B ₁ ^max; Wherein R matrix and W matrix are the bandwidth application of tri-priority services of 16 ONU and distribute bandwidth, R _{1, j}with W _{1, j}to R matrix and the summation of W matrix the first row;

Bandwidth calculation subelement, for utilizing following formula to calculate the total bandwidth application W of EF business _eFand remaining bandwidth W _rest:

$W_{\mathrm{EF}}=\underset{1}{\overset{16}{\mathrm{\&Sigma;}}}{W}_{1,j}$

W _rest=B _U-W _EF；

Middle low priority distributes subelement, distributes for the total bandwidth of AF/BE business to each ONU; In each ONU, respectively AF and BE business are distributed.

9. three-dimensional allocated bandwidth system according to claim 8, is characterized in that, described Wavelength Assignment unit also comprises:

Wavelength overhead computational subelement, for utilizing formula C _ijk=| j-i| × C _unitcalculate wavelength regulation expense, wherein C _unitfor unit wavelength regulation expense, with the average load of ONU be the same order of magnitude;

Weight calculation subelement, for calculate the weight of wavelength load balance and wavelength regulation expense according to following formula, carries out Wavelength Assignment according to described weight calculation result:

w_load[i]=(1-p[i])*p_load[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

w_tune[i]=p[i]*p_tune[i]/(p[i]*p_tune[i]+(1-p[i])*p_load[i])

Wherein p[i] be that each ONU is to wavelength regulation expense and the poor coefficient of sensitivity of load, p_load[i] and p_tune[i] be respectively the ratio that the poor and wavelength expense of wavelength load that in last round of inquiry, each ONU allocated bandwidth produces accounts for the poor and wavelength expense total value of wavelength load that all ONU produce.

10. three-dimensional allocated bandwidth system according to claim 9, is characterized in that, described frequency allocation units also for:

Determine next poll order of giving out a contract for a project the time of advent according to the first packet of high-priority service, the time slot allocation order of each bag is undertaken by order from left to right from top to bottom; The loading condition of each sub-channels after distributing according to a upper ONU, by long bag in unappropriated bag in current ONU maximum bag, distributes to the channel of least-loaded, and the loading condition that upgrades each subchannel also continues the distribution of next bag.

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