CN103546949A - Method for dispatching access network bandwidth based on sleep energy-saving mechanism - Google Patents

Abstract

The invention discloses a method for dispatching the access network bandwidth based on a sleep energy-saving mechanism. For the condition that the total service bandwidth of a system cannot completely meet the request for the total bandwidth of three types of services, firstly, the request of the EF service is totally met preferentially; secondly, the remaining total bandwidth is distributed to the AF service and the BE service. For distribution of the ONU bandwidth to the AF service and the BE service, a sleep benefit factor of each ONU is obtained through ONU bandwidth request calculation, and then the sleep benefit values, generated at different remaining bandwidths, of each ONU are obtained through calculation. When ONU bandwidth distribution is conducted, through comparison between the sleep benefit value, generated when the bandwidth is distributed to each ONU, of each ONU and the sleep benefit value, generated when the bandwidth is not distributed to the corresponding ONU, of the corresponding ONU, whether the bandwidth needs to be distributed to the ONU is determined, and therefore the optimal sleep benefit value is obtained. When remaining total bandwidth distribution is conduced, a priority-balance-factor is set so that QoS can be guaranteed, and therefore the comprehensive performance of the system is improved. According to the method for dispatching the access network bandwidth based on the sleep energy-saving mechanism, the energy-saving effect is achieved in a soft control mode, and therefore the hardware cost is not increased.

Description

A kind of Access Network bandwidth scheduling method based on dormancy power-saving mechanism

Technical field

The invention belongs to technical field of access networks, more specifically say, relate to a kind of Access Network bandwidth scheduling method based on dormancy power-saving mechanism.

Background technology

PON(Passive Optical Network in fiber broadband Access Network, EPON) system configuration is mainly comprised of the optical network unit (ONU:Optical Network Unit) of the optical line terminal (OLT:Optical Line Terminal) of central office, the optical distribution network (ODN:Optical Distribution Network) that comprises Passive Optical Components, user side, conventionally adopts point-to-multipoint tree topology.At down direction, the multiple business such as IP data, voice, video, by the OLT that is positioned at central office, adopt broadcast mode to be assigned to all ONU unit on PON by the 1:N passive optical splitter in ODN.At up direction, from the multiple business information of each ONU, by the 1:N passive light mixer in ODN, be coupled to same optical fiber without interfering with each other, be finally transferred to the OLT receiving terminal that is positioned at local side, be similar to the structure of point-to-point.Under the driving of two-forty, large bandwidth demand, the demand of Access Network bandwidth is exponential increase, and this causes adopting the fiber broadband Access Network of PON technology to obtain swift and violent development, but the too high energy consumption problem of its system has also caused concern widely gradually.Research both at home and abroad at present mainly concentrates on physical layer power save mode and data link layer power save mode, specific as follows:

A) power save mode based on physical layer

Power save mode based on physical layer is without changing upper-layer protocol, conventionally improve equipment or the device architecture of some physical layers, as Claudio BIANCO, Flavio CUCCHIETTI etc. reaches energy-saving effect by updating integrated circuit technique in " Energy consumption trends in the Next Generation Access Network-a Telco perspective " literary composition; EITETSU IGAWA, MASAMICHI NOGAMI etc. adopts better energy saver in " Symmetric10G-EPON ONU Burst-Mode Transceiver Employing Dynamic Power Save Control Circuit " literary composition, as laser of burst mode etc.

B) power save mode based on data link layer

This power save mode is mainly at EPON(Ethernet Passive Optical Network, Ethernet passive optical network) media access control (MAC, Media Access Control) layer and GPON (Gigabit-Capable PON, Gigabit Passive Optical Network) the efficient energy-conservation communication protocol of design or algorithm on Transmission Convergence (TC, Transmission Convergence) layer.Wherein, ONU sleep mode, when the service traffics of ONU end are fewer, make it in resting state, it is current most important a kind of power save mode, at " Power Saving Techniques for Optical Access " and the WONG S of JUN-ICHI KANI, in articles such as VALCARENGHI L " Sleep Mode for Energy Saving PONs:Advantages and Drawbacks ", all there is embodiment.

Above two kinds of modes all can reach certain energy-saving effect, but some negative effects have all inevitably been brought, the QoS(Quality of Service of the system of having sacrificed to a certain extent having, service quality), have plenty of by the change of physical layer equipment and device having been increased to the cost of system.Therefore develop a kind of requirement that can adapt to existing physical layer equipment, can guarantee that again the green bandwidth allocation algorithm that the performance of QoS of system is outstanding, complexity is low, be easy to realize is extremely important.

At present in QoS technology, in order to support the demand of multi service access, the QOS that guarantees system when improving energy-saving efficiency, the most frequently used is that unified priority classification is set, and often the priority of business is divided into dissimilar, mainly the priority of business is divided into EF(Effort Forward, expedited forwarding type) business, AF(Assured Forwarding, guarantees forward type) business, BE(Best Effort, as possible forward type) business.EF business is generally all in advance by preengaging between user and operator, the bandwidth application size of this type business can be expected, therefore carrying out system bandwidth resource distribution assurance this type business, and how remaining bandwidth not necessarily enough AF, two kinds of business of BE realize optimum energy-conservationly also need to study in this case.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of Access Network bandwidth scheduling method based on dormancy power-saving mechanism is provided, by the allocated bandwidth of priority balance factor and dormancy benefit factor optimizing business is set, thereby when guaranteeing the QoS of access net system, obtain good energy-saving effect.

For achieving the above object, the present invention is based on the Access Network bandwidth scheduling method of dormancy power-saving mechanism, comprise the following steps:

S1: optical line terminal OLT receives from optical network unit ONU the bandwidth request to each business, is designated as bandwidth request matrix B:

$B=\begin{array}{c}\left[\begin{array}{ccccc}{B}_{\mathrm{EF},1}& \·\·\·& B_{\mathrm{EF},i}& \·\·\·& B_{\mathrm{EF},N}\\ B_{\mathrm{AF},1}& \·\·\·& B_{\mathrm{AF},i}& \·\·\·& B_{\mathrm{AF},N}\\ B_{\mathrm{BE},1}& \·\·\·& B_{\mathrm{BE},i}& \·\·\·& B_{\mathrm{BE},N}\end{array}\right]\end{array}$

Wherein, B _m,irepresent the bandwidth request of i ONU to m class business, m ∈ EF, and AF, BE}, EF represents that this type of service is expedited forwarding, and AF represents that this type of service forwards for guaranteeing, and BE represents that this type of service is for forwarding as possible, i=1,2 ..., N, N represents the quantity of ONU; The total service bandwidth of system is designated as W _t, and ${\mathrm{\&Sigma;}}_{i=1}^N{B}_{\mathrm{EF},i}<W_t<{\mathrm{\&Sigma;}}_{i=1}^N(B_{\mathrm{EF},i}+B_{\mathrm{AF},i}+B_{\mathrm{BE},i});$

S2: according to type of service distribution service total bandwidth, the wherein total bandwidth of EF business

now remain total bandwidth W _rest=W _t-W _eF, will remain total bandwidth W _restdistribute to AF business and BE business;

S3: the total bandwidth of each business is distributed to each ONU, and wherein EF business is according to the bandwidth request allocation of each ONU, i.e. W _{eF, i}=B _{eF, i}, for AF business and BE business, adopt respectively following bandwidth allocation methods for each ONU distribution bandwidth:

S3.1: the dormancy benefit factor of calculating each ONU

calculate the dormancy benefit value g (i, j) of each ONU when different remaining bandwidth, j represents remaining bandwidth again, and span is 0≤j≤W _m, for i=1 ONU, as j>=B _{m, 1}time, g (1, j)=p ₁, as j < B _{m, 1}time, g (1, j)=0; For i=2,3 ..., N ONU, as j>=B _m,iand g (i-1, j)≤g (i-1, j-B _m,i)+p _itime, g (i, j)=g (i-1, j-B _m,i)+p _i, otherwise g (i, j)=g (i-1, j);

S3.2: successively each ONU is carried out to allocated bandwidth according to sequence number from N to 1, current residual bandwidth is designated as R, remaining bandwidth initial value is W _m, remember that best dormancy benefit is Q, initial value is 0; For i=N, N-1 ..., 2 ONU, according to the dormancy benefit value of the corresponding different remaining bandwidths of each ONU that obtain in step 3.2, if g (i, R) > g (i-1, R), W _m,i=B _m,i, upgrade R=R-B _m,i, Q=Q+p _i, otherwise W _m,i=0; For i=1 ONU, if g is (N, W _m)-Q=p ₁, W _{m, 1}=B _{m, 1}, Q=Q+p _i, otherwise W _{m, 1}=0;

S4: the allocated bandwidth matrix that can obtain ONU according to step S2 and step S3:

$W=\begin{array}{c}\left[\begin{array}{ccccc}{W}_{\mathrm{EF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},N}\\ W_{\mathrm{AF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},N}\\ W_{\mathrm{BE},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},N}\end{array}\right]\end{array}$

OLT to each ONU broadcast, completes Access Network bandwidth scheduling by allocated bandwidth matrix W.

Wherein, in step S2, will remain total bandwidth W _restthe method of distributing to AF business and BE business is: priority balance factor k is set, and the span of k is

the total bandwidth of AF business is the total bandwidth W of BE business _bE=W _rest-W _aF.

Wherein, in step S3.1, before calculating the dormancy benefit value of ONU, ONU is arranged from big to small by the dormancy benefit factor.

The present invention is based on the Access Network bandwidth scheduling method of dormancy power-saving mechanism, for the total service bandwidth of system, cannot meet the situation of the total bandwidth of three types service request completely, preferentially meet EF business completely, again residue total bandwidth is distributed to AF business and BE business, ONU allocated bandwidth for AF business and BE business, by ONU bandwidth request, calculate the dormancy benefit factor of each ONU, calculate again the dormancy benefit value of each ONU when different remaining bandwidth, when carrying out ONU allocated bandwidth, by relatively distributing bandwidth and do not distribute the dormancy benefit value of bandwidth to judge whether to distribute bandwidth to this ONU to ONU to ONU, thereby obtain best dormancy benefit.Divide timing remaining total bandwidth, also can carry out guaranteed qos by priority balance factor is set, thereby improve overall system performance.And the present invention adopts the mode of soft control to reach energy-saving effect completely, does not increase hardware cost.

Accompanying drawing explanation

Fig. 1 is a kind of embodiment flow chart of Access Network bandwidth scheduling method that the present invention is based on dormancy power-saving mechanism;

Fig. 2 is the flow chart that calculates the dormancy benefit value of i=1 ONU;

Fig. 3 calculates i=2,3 ..., the flow chart of the dormancy benefit value of N ONU;

Fig. 4 is the flow chart of ONU allocated bandwidth.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in here and will be left in the basket.

Embodiment

Fig. 1 is a kind of embodiment flow chart of Access Network bandwidth scheduling method that the present invention is based on dormancy power-saving mechanism.As shown in Figure 1, the Access Network bandwidth scheduling method that the present invention is based on dormancy power-saving mechanism comprises the following steps:

S101: the optical line terminal OLT of central office is collected from each ONU the bandwidth request to all types of business, is designated as bandwidth request matrix B:

$B=\begin{array}{c}\left[\begin{array}{ccccc}{B}_{\mathrm{EF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{EF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{EF},N}\\ B_{\mathrm{AF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{AF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{AF},N}\\ B_{\mathrm{BE},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{BE},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{BE},N}\end{array}\right]\end{array}$

B _m,irepresent the bandwidth request of i ONU to m class business, m ∈ { EF, AF, BE}, EF represents that this type of service is expedited forwarding type business, and AF represents that this type of service is for guaranteeing forward type business, and BE represents that this type of service is for the forward type business of doing the best, i=1,2 ..., N, N represents the quantity of ONU.What the present invention is directed to is the situation that the total service bandwidth of system cannot meet the total bandwidth of three types service request completely, and the total service bandwidth of system is designated as to W _t, and ${\mathrm{\&Sigma;}}_{i=1}^N{B}_{\mathrm{EF},i}<W_t<{\mathrm{\&Sigma;}}_{i=1}^N(B_{\mathrm{EF},i}+B_{\mathrm{AF},i}+B_{\mathrm{BE},i}).$

S102: each business total bandwidth based on priority balance factor is distributed:

In the present invention, will meet the bandwidth on demand of EF business completely, distribute to the total bandwidth of EF business

now remain total bandwidth W _rest=W _t-W _eF, now remain as seen total bandwidth W _restcannot meet the bandwidth request of AF business and BE business completely, therefore in AF business and BE traffic assignments bandwidth, can only partly meet, $W_{\mathrm{AF}}<{\mathrm{\&Sigma;}}_{i=1}^N{B}_{\mathrm{AF},i},W_{\mathrm{BE}}<{\mathrm{\&Sigma;}}_{i=1}^N{B}_{\mathrm{BE},i}.$

To remain total bandwidth W _restwhile distributing to AF business and BE business, can distribute according to the ratio arranging.In order to guarantee two kinds of fair relativelies between business, prevent the excessive bandwidth that occupies another business of traffic carrying capacity due to certain business, and the situation that the most of business that makes another business cannot normally be moved occurs, therefore in the present embodiment, can adopt priority balance factor to residue total bandwidth W _restdistribute, concrete grammar is:

Priority balance factor k is set, and the span of k is

the total bandwidth of AF business is the total bandwidth W of BE business _bE=W _rest-W _aF.Adopt priority balance factor k can regulate the QoS performance of AF business and BE business.

S103: EF business is carried out to ONU allocated bandwidth, due to

so total bandwidth W of EF business _eFaccording to the bandwidth request allocation of each ONU, i.e. W _{eF, i}=B _{eF, i}.

S104: carry out ONU allocated bandwidth according to dormancy benefit factor pair AF, BE business:

From step S102, now distribute to the total bandwidth W of AF business and BE business _aFand W _bEcan not meet all ONU, can only offer part ONU, those unallocated ONU to bandwidth, by do not carry out the transmission of upstream data in next polling cycle, enter semidormancy state, thereby realize energy-conservation.For the energy-saving benefit of dormancy is maximized, the present invention has introduced dormancy benefit factor p _ithe ONU bandwidth of distributing AF business and BE business, its concrete steps comprise:

S4.1: the dormancy benefit factor of calculating each ONU

now can be by ONU according to dormancy benefit factor p _isize, the size of bandwidth application is carried out descending, makes the ONU that dormancy benefit value is large preferentially meet the bandwidth of its application, thereby guarantees that entire system obtains maximum dormancy benefit value.

S4.2: the dormancy benefit factor obtaining according to step S4.1 is calculated the dormancy benefit value g (i, j) of each ONU when different remaining bandwidth, and j represents remaining bandwidth, and span is 0≤j≤W _n.Visible as j < B _m,itime, i ONU cannot obtain the bandwidth of request, distributes bandwidth, now dormancy benefit value g (i, j)=g (i-1, j) to i ONU; And as j>=B _m,itime, there are two kinds of situations:

Situation 1: distribute bandwidth, equally now dormancy benefit value g (i, j)=g (i-1, j) to i ONU;

Situation 2: distribute bandwidth to i ONU, now produce dormancy benefit p _i, remaining bandwidth is j-B _m,i, because adopting the mode of inverted order, the present invention carries out ONU allocated bandwidth, so remaining bandwidth j-B now _m,ican distribute to B _{m, 1}, B _{m, 2}... B _{m, i-1}, dormancy benefit value g (i, j)=g (i-1, j-B now _m,i)+p _i.

The desired best dormancy benefit obtaining of the present invention is the maximum of situation 1 and 2 two kinds of dormancy benefit value of situation, so there is recurrence Relation to be:

$g(i,j)=\left\{\begin{array}{cc}g(i-1,j),& j<B_{m,i}\\ \max (g(i-1,j),g(i-1,j-B_{m,i})+p_i),& j\&GreaterEqual;B_{m,i}\end{array}\right.$

The boundary condition of this algorithm is formula:

$g(1,j)=\left\{\begin{array}{cc}{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA0000400721390000012.png,HDA0000400721390000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_1,& j<B_{m,1}\\ 0,& j<B_{m,1}\end{array}\right.$

Therefore when calculating dormancy benefit value, the dormancy benefit value of i=1 ONU be need to first obtain, i=2,3 then calculated successively ..., the dormancy benefit value of N ONU.Fig. 2 is the flow chart that calculates the dormancy benefit value of i=1 ONU.As shown in Figure 2, the dormancy benefit value of calculating i=1 ONU comprises the following steps:

S201: initialization remaining bandwidth j=0.

S202: judge whether remaining bandwidth j>=B _{m, 1}, if so, enter step S203, if not, step S204 entered.

S203:g (1, j)=p ₁, enter step S205.

(1, j)=0, enters step S205 to S204:g.

S205: judge whether j=W _m, if so, calculate and finish, if not, step S206 entered.

S206: make j=j+ Δ W, wherein Δ W represents the step-length arranging, and returns to step S202.

From above computational process, can find out, will obtain dormancy benefit value corresponding to a plurality of different remaining bandwidth j, these values by after the ONU allocated bandwidth that reaches best dormancy benefit in use.Can getable current residual bandwidth for these remaining bandwidths j can be covered in ONU allocated bandwidth, aspect the arranging of step delta W, should determine with the order of magnitude of minimum value in bandwidth request, for example, when bandwidth request value is 1M, 3M, 6M, 400k, the step-length now arranging can be 100k.A kind of easier method is to ask the common divisor of all bandwidth request values.

Fig. 3 calculates i=2,3 ..., the flow chart of the dormancy benefit value of N ONU.As shown in Figure 3, calculate i=2,3 ..., the dormancy benefit value of N ONU comprises the following steps:

S301: initialization i=2.

S302: initialization j=0.

S303: judge whether remaining bandwidth j>=B _m,i, if so, enter step S304, if not, step S306 entered.

S304: judge whether g (i-1, j)≤g (i-1, j-B _m,i)+p _i, if so, enter step S305, if not, step S306 entered.

S305: make g (i, j)=g (i-1, j-B _m,i)+p _i, enter step S307.

S306: make g (i, j)=g (i-1, j), enter step S307.

S307: judge whether j=W _m, if so, enter step S309, if not, step S308 entered.

S308: make j=j+ Δ W, return to step S303.

S309: judge whether i=N, if so, calculate and finish, if not, enter step S310.

S310: make i=i+1, return to step S302.

S4.3: successively each is carried out to ONU allocated bandwidth from N to 1 according to sequence number.In the present invention, for the AF business of certain ONU and the bandwidth request of BE business, otherwise the bandwidth meeting the demands to its distribution, note x _i=1; To it, do not distribute bandwidth, note x _i=0; The producible dormancy benefit of certain allocation result is

final purpose of the present invention obtains maximum dormancy benefit

Fig. 4 is the flow chart of ONU allocated bandwidth.As shown in Figure 4, ONU allocated bandwidth comprises:

S401: initialization ONU sequence number i=N, current residual bandwidth R=W _m, best dormancy benefit is Q=0.

S402: the dormancy benefit value according to the corresponding different remaining bandwidths of each ONU that obtain in step S4.2, judge whether g (i, R) > g (i-1, R), if so, enter step S403, if not, enter step S404.Visible, this step is by relatively distributing bandwidth and do not distribute the dormancy benefit value size of bandwidth to judge whether to distribute bandwidth to this ONU to ONU to ONU.

S403: be that i ONU distributes bandwidth, i.e. W _m,i=B _m,i, upgrade current residual bandwidth R=R-B _m,i, best dormancy benefit Q=Q+p _i, enter step S405.

S404: be not that i ONU distributes bandwidth, i.e. W _m,i=0, current residual bandwidth R and best dormancy benefit Q are all constant, enter step S405.

S405: make i=i-1.

S406: judge whether i=1, if so, enter step S407, if not, return to step S402.

S407: judge whether g (N, W _m)-Q=p ₁, if so, enter step S408, if not, step S409 entered.

S408: distribute bandwidth, i.e. W to i=1 ONU _{m, 1}=B _{m, 1}, Q=Q+p _i, ONU allocated bandwidth finishes.

S409: distribute bandwidth, i.e. W to i=1 ONU _{m, 1}=0, ONU allocated bandwidth finishes.

S105: the allocated bandwidth matrix that can obtain ONU according to step S103 and step S104:

$W=\begin{array}{c}\left[\begin{array}{ccccc}{W}_{\mathrm{EF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},N}\\ W_{\mathrm{AF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},N}\\ W_{\mathrm{BE},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},N}\end{array}\right]\end{array}$

Optical line terminal OLT to each ONU broadcast, completes Access Network bandwidth scheduling by allocated bandwidth matrix W, distributes the ONU that bandwidth is 0 in next polling cycle, to enter semidormancy state, does not carry out the transmission of upstream data, thereby reaches energy-conservation effect.

The present invention adopts the mode of soft control to reach energy-saving effect completely, and hardware cost does not increase.It had both been different from classical DBA(Dynamic Bandwidth Allocation, Dynamic Bandwidth Allocation) algorithm (can only guarantee the QoS of system), be different from again the power save mode (performance with system exchanges energy-conservation effect for) of various data link layers now, but can be by dormancy benefit factor p _iqoS and energy-saving effect have been realized with arranging of priority balance factor k simultaneously.

Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and definite the spirit and scope of the present invention in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (3)

1. the Access Network bandwidth scheduling method based on dormancy power-saving mechanism, is characterized in that, comprises the following steps:

S1: optical line terminal OLT receives from optical network unit ONU the bandwidth request to each business, is designated as bandwidth request matrix B:

$B=\begin{array}{}\left[\begin{array}{ccccc}{B}_{\mathrm{EF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{EF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{EF},N}\\ B_{\mathrm{AF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{AF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{AF},N}\\ B_{\mathrm{BE},1}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{BE},i}& \&CenterDot;\&CenterDot;\&CenterDot;& B_{\mathrm{BE},N}\end{array}\right]\end{array}$

Wherein, B _m,irepresent the bandwidth request of i ONU to m class business, m ∈ { EF, AF, BE}, EF represents that this type of service is expedited forwarding type business, and AF represents that this type of service is for guaranteeing forward type business, and BE represents that this type of service is for the forward type business of doing the best, i=1,2 ..., N, N represents the quantity of ONU; The total service bandwidth of system is designated as W _t, and ${\mathrm{\&Sigma;}}_{i=1}^N{B}_{\mathrm{EF},i}<W_t<{\mathrm{\&Sigma;}}_{i=1}^N(B_{\mathrm{EF},i}+B_{\mathrm{AF},i}+B_{\mathrm{BE},i});$

S2: according to type of service distribution service total bandwidth, the wherein total bandwidth of EF business

now remain total bandwidth W _rest=W _t-W _eF, will remain total bandwidth W _restdistribute to AF business and BE business;

S3: the total bandwidth of each business is distributed to each ONU, and wherein EF business is according to the bandwidth request allocation of each ONU, i.e. W _{eF, i}=B _{eF, i}, for AF business and BE business, adopt respectively following bandwidth allocation methods for each ONU distribution bandwidth:

S3.1: the dormancy benefit factor of calculating each ONU calculate the dormancy benefit value g (i, j) of each ONU when different remaining bandwidth, j represents remaining bandwidth again, and span is 0≤j≤W _m, for i=1 ONU, as j>=B _{m, 1}time, g (1, j)=p ₁, as j < B _{m, 1}time, g (1, j)=0; For i=2,3 ..., N ONU, as j>=B _m,iand g (i-1, j)≤g (i-1, j-B _m,i)+p _itime, g (i, j)=g (i-1, j-B _m,i)+p _i, otherwise g (i, j)=g (i-1, j);

S3.2: successively each ONU is carried out to allocated bandwidth according to sequence number from N to 1, current residual bandwidth is designated as R, remaining bandwidth initial value is W _m, remember that best dormancy benefit is Q, initial value is 0; For i=N, N-1 ..., 2 ONU, according to the dormancy benefit value of the corresponding different remaining bandwidths of each ONU that obtain in step 3.2, if g (i, R) > g (i-1, R), W _m,i=B _m,i, upgrade R=R-B _m,i, Q=Q+p _i, otherwise W _m,i=0; For i=1 ONU, if g is (N, W _m)-Q=p ₁, W _{m, 1}=B _{m, 1}, Q=Q+p _i, otherwise W _{m, 1}=0;

S4: the allocated bandwidth matrix that can obtain ONU according to step S2 and step S3:

$W=\begin{array}{c}\left[\begin{array}{ccccc}{W}_{\mathrm{EF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{EF},N}\\ W_{\mathrm{AF},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{AF},N}\\ W_{\mathrm{BE},1}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},i}& \&CenterDot;\&CenterDot;\&CenterDot;& W_{\mathrm{BE},N}\end{array}\right]\end{array}$

OLT to each ONU broadcast, completes Access Network bandwidth scheduling by allocated bandwidth matrix W.

2. the Access Network bandwidth scheduling method based on dormancy power-saving mechanism according to claim 1, is characterized in that, in described step S2, will remain total bandwidth W _restthe method of distributing to AF business and BE business is: priority balance factor k is set, and the span of k is

the total bandwidth of AF business is

the total bandwidth W of BE business _bE=W _rest-W _aF.

3. the Access Network bandwidth scheduling method based on dormancy power-saving mechanism according to claim 1, is characterized in that, in described step S3.1, before calculating the dormancy benefit value of ONU, ONU is arranged from big to small by the dormancy benefit factor.

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