CN101577670A - Method, device and system for bandwidth allocation - Google Patents

Abstract

The embodiment of the invention relates to a method, a device and a system for bandwidth allocation. The method for bandwidth allocation comprises the following steps: when detecting reduction in network bandwidth resources, adjusting the bandwidths of communication links to minimum bandwidth values corresponding to communication links according to the preset minimum bandwidth values; if the network bandwidth resources are improved after the adjustment, acquiring the bandwidth increments required by the communication links according to the maximum bandwidth values and video subjective quality of the communication links; and according to the bandwidth increments, sequentially allocating the remaining bandwidth resources to the communication links from high priority to low priority of the communication links. The embodiment of the invention guarantees the optimization of the overall allocation of the bandwidth resources, thereby guaranteeing the service quality of user communication terminals.

Description

Bandwidth allocation methods, Apparatus and system

Technical field

The embodiment of the invention relates to network field, relates in particular to a kind of bandwidth allocation methods, Apparatus and system.

Background technology

Since the nineties in 20th century, Internet service is owing to providing a large amount of and abundant business tine to obtain development at full speed, and meanwhile, mobile communication business also emerges rapidly, can communicate the active demand that becomes people's daily life whenever and wherever possible.Under this background, (Next Generation Network is hereinafter to be referred as conception NGN) to have proposed next generation network.The essential characteristic of NGN is: provide a large amount of broadband services, in order to increase professional income; Merge the diverse network business,, comprise streaming media service such as instant message, video request program such as data, phone, multimedia and various Internet service of rising.

NGN system and standard employing Internet Protocol (Internet Protocol, hereinafter to be referred as: IP) technology is as the bearer network of NGN business.The NGN class of business is various, comprise multimedia services such as voice, data, video, these business are to service quality (Quality of Service, hereinafter to be referred as: requirement QoS) has nothing in common with each other, real time business such as voice and video for example, very sensitive to time delay, require as far as possible little time delay, and allow certain packet loss; Data file and still picture etc. are professional insensitive to time delay, but require lower packet loss.Moreover, NGN may be made up of the zone of several operators, and the transmission performance of these heterogeneous networks also has nothing in common with each other.Therefore, in NGN, QoS end to end there is more strict requirement, must be better the QoS of NGN be effectively controlled, to guarantee the quality of NGN communication.But traditional IP technology is difficult to satisfy the requirement of the professional diversity of NGN, real-time and fail safe, and existing public ip network can't have the carrying service that QoS guarantees on a large scale for flexible exchanging network provides.

Because the network bandwidth constantly increases, operator is when solving the problem of network congestion and QoS, and the simplest method is exactly " problem is thrown to bandwidth ", causes network capacity constantly to increase.The target of resource management is under the condition of limited resources, and the available resources of flexible allocation and dynamic debugging system improve resource utilization ratio to greatest extent, prevent network congestion, guarantees for user communication terminal provides professional service quality again simultaneously.Therefore, close contact is arranged between QoS and the bandwidth management method, the Bandwidth Management ability is the foundation stone that operator solves the QoS problem.

Prior art provides a kind of method that adopts price strategy distribution network bandwidth in IP network, when network can not satisfy all users' that communicating by letter qos requirement simultaneously, operator can lose, in this case, operator can adopt price strategy distribution network bandwidth, thereby guarantees the maximization of communication service running income.So-called price strategy is meant linear price strategy, and its service performance parameter is the packet time delay.Suppose and use i, j (i, j=1,2 ..., n) represent the grade of service (also can be described as priority) of user communication terminal, use d _iRepresent that the grade of service is the packet time delay of the user communication terminal of i, uses r _i(d _i) represent that cost function, described cost function are defined as QoS that network provider provides and user and pay functional relation between the price, its expression formula is:

r _i(d _i)＝b _i-k _id _i (1.1)

B wherein _iAnd k _iBe the parameter of cost function, b _i＞0, k _i＞0.Usually, if grade of service i is higher than grade of service j, b is arranged then _i＞b _j, k _i＞k _jUnder this price strategy, the higher user of the grade of service will pay higher expense, simultaneously, when operator can not satisfy higher grade of service user's qos requirement, also will pay more compensation.

Suppose the total bandwidth of representing network with Cbit/s, use λ ₁, λ ₂..., λ _nThe arrival rate of representing the Business Stream of n the grade of service, the arrival rate of Business Stream satisfy Poisson (Poisson) and distribute, and the data packet length of Business Stream is exponential distribution, uses L _i(bits) average packet of expression grade of service i is long, uses ω _iC represents to distribute to the bandwidth of the Business Stream of grade of service i, wherein ω _iThe bandwidth of Business Stream that grade of service i is distributed in expression accounts for the ratio of total bandwidth, to the constraints of these ratios is:

${\mathrm{\Σ}}_{i=1}^n{\mathrm{\ω}}_i=1,{\mathrm{\ω}}_i\≤1,{\mathrm{\ω}}_i\∈\left(\mathrm{0,1}\right]$

Suppose that distributing bandwidth and allocation process ability and buffer memory capacity to be complementary (promptly distributes bandwidth not to be subjected to the restriction of allocation process ability and can be fully used, packet loss can not overflowed because of buffer memory in system yet), then based on queuing theory, average data packet delay d under no packet drop _iCan be expressed as:

d _i＝1/(ω _ic/L _i-λ _i)＝L _i/(ω _ic-λ _iL _i)

The constraints of following formula is ω _iC＞λ _iL _iBecause the communication service running income that adopts tolerance is for the communication service running income in the unit interval, behind the above-mentioned linear cost function of substitution, the communication service running income REV that network provider obtains can be expressed as:

$\mathrm{REV}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\λ}}_i{r}_i\left(d_i\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\λ}}_i(b_i-\frac{k_i\stackrel{\‾}{L_i}}{{\mathrm{\ω}}_{i}c-{\mathrm{\λ}}_i\stackrel{\‾}{L_i}})---\left(1.2\right)$

The maximized allocated bandwidth problem of communication service running income under the then online sexual valence lattice strategy can be represented with following optimization solving equation:

$\max \mathrm{REV}=\max \underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\λ}}_i(b_i-\frac{k_i\stackrel{\‾}{L_i}}{{\mathrm{\ω}}_{i}c-{\mathrm{\λ}}_i\stackrel{\‾}{L_i}})---\left(1.3\right)$

Wherein on optimization point, satisfy following constraints:

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ω}}_i=1,{\mathrm{\ω}}_i\∈\left(\mathrm{0,1}\right]---\left(1.4\right)$

ω _ic＞λ _iL _i(1.5)

Utilize lagrangian optimization algorithm,, be constructed as follows Lagrange's equation according to formula (1.3) and (1.4):

$p=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\λ}}_i(b_i-\frac{k_i\stackrel{\‾}{L_i}}{{\mathrm{\ω}}_{i}c-{\mathrm{\λ}}_i\stackrel{\‾}{L_i}})+\mathrm{\σ}(1-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ω}}_i)---\left(1.6\right)$

Get the partial differential of P

And make it to equal 0, just can obtain ω _iThereby, obtain the communication service running income of operator.When the second-order partial differential coefficient of formula (1.6) strict with 0 or strict in (0,1) less than 0 o'clock, ω _iUnique optimal solution is arranged in (0,1).

In the middle of realization process of the present invention, the inventor finds that there is following defective in above-mentioned prior art:

(1) this technical scheme can guarantee the benefits of operators maximization, but can not guarantee that bandwidth resources obtain the total optimization utilization, and then can not guarantee network service quality;

(2) this technical scheme only with the packet time delay as the network service performance parameter, can't concentrated expression real-time video telecommunication service quality.

Summary of the invention

The bandwidth allocation methods that the embodiment of the invention provides, Apparatus and system can guarantee that bandwidth resources obtain the total optimization utilization, thereby guarantee network service quality.

The embodiment of the invention provides a kind of bandwidth allocation methods, comprising:

When monitoring network bandwidth resources when reducing,, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link according to the preset bandwidth minimum value;

Improve if adjust the back network bandwidth resources,, obtain the bandwidth increments that each communication link needs then according to the maximum value bandwidth and the video subjective quality of each communication link;

According to described bandwidth increments,, the network remaining bandwidth is distributed to each communication link successively according to the priority order from high to low of each communication link.

The embodiment of the invention provides a kind of allocated bandwidth device, comprising:

Monitoring modular is used for the monitoring network bandwidth resources, determines current network bandwidth resources situation;

Minimum value is provided with module, is used to obtain the current network bandwidth resources situation of monitoring modular, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link;

First acquisition module, be used to obtain the current network bandwidth resources situation of monitoring modular, when minimum value is provided with the adjusted network bandwidth resources of module and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs;

First distribution module is used for the bandwidth increments according to described first acquisition module, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

The embodiment of the invention provides a kind of allocated bandwidth system, comprising: transmit leg media gateway, receiving method, medium gateway and Media Gateway Controller; Described Media Gateway Controller comprises:

Monitoring modular is used to monitor the network bandwidth resources between described transmit leg media gateway and the described receiving method, medium gateway, determines current network bandwidth resources situation;

Minimum value is provided with module, is used to obtain the current network bandwidth resources situation of monitoring modular, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link;

First acquisition module, be used to obtain the current network bandwidth resources situation of monitoring modular, when minimum value is provided with the adjusted network bandwidth resources of module and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs;

First distribution module is used for the bandwidth increments according to described first acquisition module, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

The bandwidth allocation methods that the embodiment of the invention provides, Apparatus and system, when monitoring the network bandwidth resources minimizing, at first the bandwidth with each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link, and then according to the bandwidth resources situation that can provide, priority order from high to low according to each communication link, the network remaining bandwidth is distributed to each communication link successively, thereby can guarantee bandwidth resources integral dispensing optimization, and then guarantee network service quality.

Description of drawings

Fig. 1 is the flow chart of bandwidth allocation methods embodiment of the present invention;

The flow chart that Fig. 2 inserts for bandwidth allocation methods embodiment user communication terminal of the present invention;

Fig. 3 is the schematic diagram of allocated bandwidth device embodiment of the present invention;

Fig. 4 is the structure chart of allocated bandwidth system embodiment of the present invention.

Embodiment

Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.

The embodiment of the invention has proposed the optimized scheme of assurance bandwidth resources integral dispensing, when causing network condition to worsen when monitoring the bandwidth resources minimizing suddenly between transmit leg and the recipient (for example two media gateway), at first according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into the bandwidth minimum corresponding with each communication link; Secondly if the bandwidth resources that can provide after adjusting improve, then, obtain the required bandwidth increments of each communication link according to the maximum value bandwidth and the video subjective quality of described each communication link; According to bandwidth increments,, the network remaining bandwidth is distributed to each communication link successively according to the priority order from high to low of each communication link.

Further, introduce the video subjective quality model that objectifies in embodiments of the present invention.So-called subjective quality is meant the subjectivity experience after the user uses product, the video subjective quality is appraised through comparison the video pictures of being seen under particular environment by selected at random some users and is obtained, video quality is divided into following 5 kinds of subjective qualities at present, seeing Table 1, is the video subjective quality of 5 grades.

The video subjective quality of table 1.5 grade

5	Excellent
		4	Good
3	Fire
		2	Poor
1	Bad

But, each section video all by experiment method to obtain the video subjective quality be consuming time and infeasible, therefore, address this problem by introducing the video subjective quality model that objectifies in the embodiment of the invention.The video subjective quality model that objectifies utilizes network quality statistical parameter and coding parameter, as packet loss, frame per second and bit rate etc., by calculating the video subjective quality.The video subjective quality model that objectifies is as follows:

$V_q=1+I_{\mathrm{coding}}\·\exp (-\frac{P_{\mathrm{plv}}}{D_{P_{\mathrm{plv}}}})---\left(2.1\right)$

Wherein, V _qExpression video subjective quality; I _CodingExpression elementary video quality (influenced by coding distortion) (is used Br by video code bit rate _VRepresent) and video frame rate (use Fr _VRepresent) determine;

Represent the video quality robustness relevant with packet loss; P _PlvThe expression packet loss; Wherein, V _qThe codomain scope be 1≤V _q≤ 5.

I _CodingCan be expressed from the next:

$I_{\mathrm{coding}}=I_{\mathrm{Ofr}}\exp \{-\frac{{(\ln \left({\mathrm{Fr}}_V\right)-\ln \left(\mathrm{Ofr}\right))}^2\}}{2D_{{\mathrm{Fr}}_V}^2}\}---\left(2.2\right)$

Wherein, Ofr represents the optimization frame per second under the particular video frequency coding bit rate,

Ofr=v ₁+ v ₂Br _V, 1≤Ofr≤30, v ₁, v ₂It is constant; (2.3)

When video frame rate equals the optimization frame per second, i.e. Fr _VDuring=Ofr, I _Coding=I _Ofr, I _OfrObtainable maximum video quality under the expression particular video frequency coding bit rate, its expression formula is:

$I_{\mathrm{Ofr}}=v_3-\frac{v_3}{1+{\left(\frac{{\mathrm{Br}}_V}{v_4}\right)}^{v_5}}---\left(2.4\right)$

0≤I in the following formula _Ofr≤ 4, v ₃, v ₄, v ₅Be constant;

Expression and Fr _VRelevant video quality robustness, its expression formula is:

$D_{{\mathrm{Fr}}_V}={\mathrm{<figure-callout\; id="6"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_6+{\mathrm{<figure-callout\; id="7"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_7{\mathrm{Br}}_V---\left(2.5\right)$

In the following formula $0<D_{{\mathrm{Fr}}_V},$ v ₆, v ₇It is constant.

Expression formula be:

$D_{P_{\mathrm{plV}}}=v_{10}+v_{11}\exp (-\frac{{\mathrm{Fr}}_V}{v_8})+v_{12}\exp (-\frac{{\mathrm{Br}}_V}{v_9})---\left(2.6\right)$

In the following formula $0<D_{P_{\mathrm{plV}}},$ v ₉, v ₉..., v ₁₂It is constant.

The above parameter v ₁, v ₂..., v ₁₁, v ₁₂Choose relevantly with factors such as type of coding, video format, frame refresh interval and video display sizes, can be determined by experiment v according to above-mentioned formula ₁, v ₂..., v ₁₁, v ₁₂For example, at first, at the individual different frame per second Fr of M (M is a natural number) _V, method by experiment draws the video subjective quality V under the different frame per second _q, obtain table 2;

Table 2.Br _V, Fr _V, V _qRelation between three parameters

Br V	Fr V	V q
			b n	f 1	V q(b n，f 1)
b n	f 2	V q(b n，f 2)
			…	…	…
b n	f m	V q(b n，f m)
			…	…	…
b n	f M	V q(b n，f M)

Then, with data substitution (2.1) formula in the table 2, for each b _n, I _Ofr, Ofr,

The value of three parameters can obtain by using least square method (LST) algorithm, thereby obtains table 3;

Table 3.B _rV, I _Ofr, Ofr, Between relation

Afterwards, with the b that obtains in the table 3 _n, 0 _n(n=1,2 ..., N) substitution formula (2.3) uses the LST algorithm can obtain v ₁, v ₂Estimated value; With the b that obtains in the table 3 _n, I _n(n=1,2 ..., N) substitution formula (2.4) uses the LST algorithm can obtain v ₃, v ₄, v ₅Estimated value; With the b that obtains in the table 3 _n, D _n(n=1,2 ..., N) substitution formula (2.5) uses the LST algorithm can obtain v ₆, v ₇Estimated value;

Value substitution formula (2.2) with in the table 3 can obtain I _CodingValue, with I _CodingWith video subjective quality V _qSubstitution formula (2.1) then at different frame per second and code check, uses the LST algorithm can obtain one group

Estimated value, as table 4;

Table 4.

Br _V, Fr _VBetween relation

With f _mWith $D_{P_{\mathrm{plv}}}=D_{b1\mathrm{fm}}(m=\mathrm{1,2},...,M)$ Substitution formula (3.1) uses the LST algorithm can calculate parameter a, b and v ₈Estimated value;

$D_{\mathrm{pplV}}=a+b\&CenterDot;\exp (-\frac{F_{\mathrm{rV}}}{v_8})---\left(3.1\right)$

With b _nWith $D_{P_{\mathrm{plv}}}=D_{\mathrm{bnf}1}(n=\mathrm{1,2},...,N)$ Substitution formula (3.2) uses the LST algorithm can calculate parameter c, d and v ₉Estimated value;

$D_{\mathrm{pplV}}=c+d\&CenterDot;\exp (-\frac{B_{\mathrm{rV}}}{v_9})---\left(3.2\right)$

With v ₈, v ₉, $D_{P_{\mathrm{plv}}}=D_{\mathrm{bnfm}},$ Br _V=b _nAnd Fr _V=f _m(n=1,2,, N; M=1,2,, M) substitution formula (2.6) is used the LST algorithm, obtains v ₁₀, v ₁₁, v ₁₂Estimated value;

Method shown in more than using, the H.264 corresponding parameter v of standard ₁, v ₂..., v ₁₁, v ₁₂Value result as follows: v ₁=23.840, v ₂=0.003, v ₃=4.685, v ₄=231.652, v ₅=0.913, v ₆=1.957, v ₇=0.001, v ₈=0.373, v ₉=481.597, v ₁₀=49.73, v ₁₁=46.257, v ₁₂=82.30.

As shown in Figure 1, be the flow chart of bandwidth allocation methods embodiment of the present invention.In the present embodiment, between transmit leg and the recipient (for example two media gateway) the different signal in n road is arranged, according to priority order from high to low with numbering i (i=1,2 ..., n) come different communication links is identified.Different numberings is represented the communication link of different priorities signal between transmit leg and the recipient, and wherein, the communication link numbering is more little, and priority is high more, and for example the priority of communication link i is higher than communication link i+1, and the priority of communication link i=1 is the highest.

Step 101, when monitoring the network bandwidth when reducing, according to the preset bandwidth minimum value, the bandwidth of distributing to the employed communication link of each user communication terminal is adjusted into the bandwidth minimum corresponding with each communication link; The state of network is along with the time changes, such as most typical variation is that the instant bandwidth of network fluctuates, for example bandwidth descends suddenly or rises, therefore, Media Gateway Controller (MediaGateway Controller, hereinafter to be referred as: MGC) according to the statistical information of each communication link, can monitor the bandwidth between transmit leg and the recipient, when the variation that monitors each road communication quality is to cause owing to the bandwidth between transmit leg and the recipient reduces, for example, the bandwidth that the user's communications link needs does not descend, but the bandwidth that can provide between transmit leg and the recipient is less, can not satisfy the bandwidth needs of communication link, thereby the available bandwidth of communication link is reduced, influence the quality of communication link, then will distribute to the bandwidth of the employed communication link of each user communication terminal and reduce to bandwidth minimum;

After step 102, the process adjustment of step 101, judge whether network condition improves, if then at the highest communication link of priority, for example communication link 1, execution in step 103; Otherwise, execution in step 110; Wherein, judging whether network condition improves can be, if the bandwidth that can provide after adjusting between transmit leg and the recipient improves, can think that network is improved, can monitor network condition by network dynamic monitoring, report mechanism, two kinds of feasible methods: (1) sends probe messages, and (2) utilize the appraising model that is provided with to determine according to the report information of certain report agreement such as RTCP (Real Time Control Protocol) feedback;

Step 103, at a communication link, the computing network remaining bandwidth; Wherein, the network remaining bandwidth is, the remaining available bandwidth of network promptly deducts dedicated bandwidth with the total bandwidth of network, and dedicated bandwidth comprises that the bandwidth and the link that are newly assigned to link have taken the bandwidth that communicates;

Step 104, judge at the bandwidth currency of communication link whether reach the bandwidth initial value, if, execution in step 108; Otherwise, execution in step 105;

In this step, if the bandwidth of this communication link has reached its communication link bandwidth initial value, can think that then the required bandwidth increments of this communication link is zero, promptly this communication link does not need to carry out the distribution of bandwidth increments, and directly execution in step 108;

Step 105, according at bandwidth currency, maximum value bandwidth and the video subjective quality of communication link, obtain at the required bandwidth increments of communication link; Wherein, can according at the parameters such as packet loss, video frame rate and video code bit rate of communication link, determine the video subjective quality;

In this step, the bandwidth of this communication link does not reach its communication link bandwidth initial value, then can calculate the required bandwidth of this communication link by the optimization strategy expression formula earlier, and current according to this communication link then bandwidth is determined bandwidth increments;

Step 106, judge at the required bandwidth increments of communication link whether be less than or equal to the network remaining bandwidth, if then execution in step 107; Otherwise, finish;

Step 107, give institute at the required bandwidth increments of communication link distribution; Adjust at the bandwidth of communication link be former bandwidth and bandwidth increments sum;

Step 108, judge priority time be lower than at next communication link of communication link whether exist; If exist, then at this next communication link execution in step 103, if for example at communication link be i, then its next communication link is the communication link i+1 lower than i priority; If next communication link do not exist, then execution in step 109, for example at communication link be communication link n, the last item communication link that promptly priority is minimum;

Step 109, judgement are through after adjusting, and whether recipient's receiving velocity improves, and for example whether receiving velocity is improved, if then at the highest communication link of priority, for example communication link 1, execution in step 103; Otherwise, finish;

Step 110, distribute bandwidth according to price strategy.

Through above-mentioned steps, MGC finishes redistributing bandwidth resources, at the multi-channel video transmission link between transmit leg and the recipient, when the bandwidth of transmit leg between the recipient reduces, technique scheme has guaranteed multi-channel video transmission bandwidth resource allocation total optimization, and then guarantees the optimization of multi-channel video QoS.

Further, in the step 105 can by the optimization strategy expression formula calculate at the required bandwidth of a communication link, wherein the optimization strategy expression formula can for:

$B_i=B_{\mathrm{inormal}}+(B_{i\max }-B_{\mathrm{inormal}})\exp (-\frac{V_q-1}{s})---\left(2.7\right)$

Wherein, B _iExpression MGC need redistribute the bandwidth to communication link i, B _InormalThe current bandwidth of expression communication link i, B _ImaxThe maximum value bandwidth of expression communication link i, s represents positive number constant, V _qThe video subjective quality of expression aforementioned definitions is with reference to (2.1) formula; Because 1≤V _q≤ 5, by (2.7) formula as can be known, V _qMore little, need redistribute to the bandwidth of communication link i greatly more, work as V _q=1 o'clock, the bandwidth that need redistribute to communication link i was the maximum value bandwidth of communication link i.

MGC adopts above-mentioned optimization strategy expression formula to carry out the bandwidth adjustment, parameters such as the video frame rate that parameter such as the current packet loss of this circuit-switched data signal that needs at first the recipient according to communication link i to report, time delay and transmit leg report, video code bit rate, calculate the video subjective quality, further, calculate the bandwidth that to redistribute to communication link i according to maximum value bandwidth and current bandwidth value.

After the process adjustment of step 101, can't improve the network condition between transmit leg and the recipient, in this case, Virtual network operator can not satisfy the QoS demand of all user communication terminals simultaneously, then execution in step 110, distribute bandwidth according to the maximized price strategy of communication service running income, comprising:

Step 1100, according to parameters such as packet loss, video frame rate and video code bit rates, set up the functional relation of video subjective quality and communication link bandwidth;

Step 1101, according to the relational expression of video subjective quality and cost function, set up the functional relation of communication service running income and communication link bandwidth;

Step 1102, according to the functional relation of described communication service running income and communication link bandwidth, the bandwidth of communication link when obtaining the maximization of communication service running income.

In step 1100, can set up the functional relation of video subjective quality and communication link bandwidth in the following way:, use λ with the total bandwidth that Cbit/s represents network ₁, λ ₂..., λ _nThe arrival rate of representing the Business Stream of n priority, the arrival rate of Business Stream satisfies Poisson distribution, uses ω _iC represents to distribute to the bandwidth of communication link i, wherein ω _iThe bandwidth that communication link i is distributed in expression accounts for the ratio of total bandwidth, to the constraints of these ratios is: ${\mathrm{\&Sigma;}}_{i=1}^n{\mathrm{\&omega;}}_i=1,$ ω _i≤ 1, ω _i∈ (0,1]; Use V _QiiThe video subjective quality of expression communication link i by (2.1)～(2.7) formula, is brought (2.2) formula into (2.1) formula and can be got V _QiExpression formula be:

$V_{\mathrm{qi}}=1+I_{\mathrm{Ofri}}\&CenterDot;\exp \{-\frac{{[\ln \left({\mathrm{Fr}}_{\mathrm{Vi}}\right)-\ln \left({\mathrm{Ofr}}_i\right)]}^2}{2D_{{\mathrm{Fr}}_{\mathrm{Vi}}}^2}\}\&CenterDot;\exp (-\frac{P_{\mathrm{PlVi}}}{D_{P_{\mathrm{plVi}}}})---\left(2.8\right)$

Wherein, the subscript i in (2.8) formula represents communication link i corresponding parameters; Setting video frame per second Fr _ViEqual the optimization frame per second Ofr under the particular video frequency coding bit rate _i, and with (2.3)～(2.6) formula substitutions (2.8) Shi Kede:

$V_{\mathrm{qi}}=1+[v_3-\frac{{\mathrm{<figure-callout\; id="3"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_3}{1+{\left(\frac{{\mathrm{Br}}_{\mathrm{Vi}}}{v_4}\right)}^{v_5}}]\&CenterDot;\exp [-\frac{P_{\mathrm{PlVi}}}{v_{10}+v_{11}\&CenterDot;\exp (-\frac{v_1+{\mathrm{<figure-callout\; id="2"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_2{\mathrm{Br}}_{\mathrm{Vi}}}{v_8})+v_{12}\&CenterDot;\exp (-\frac{{\mathrm{Br}}_{\mathrm{Vi}}}{v_9})}]---\left(2.9\right)$

Under the situation of not considering the bottom transmission means, Br _ViCan see the bandwidth of communication link i as, that is:

Br _Vi＝ω _iC (2.10)

Formula (2.10) substitution formula (2.9) can be got:

$V_{\mathrm{qi}}=1+[v_3-\frac{{\mathrm{<figure-callout\; id="3"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_3}{1+{\left(\frac{{\mathrm{\&omega;}}_{i}C}{v_4}\right)}^{v_5}}]\&CenterDot;\exp [-\frac{P_{{\mathrm{plV}}_i}}{v_{10}+v_{11}\&CenterDot;\exp (-\frac{v_1+{\mathrm{<figure-callout\; id="2"\; label="v"\; filenames="A20081010599700281.png"\; state="\{\{state\}\}">v</figure-callout>}}_2{\mathrm{\&omega;}}_{i}C}{v_8})+v_{12}\&CenterDot;\exp (-\frac{{\mathrm{\&omega;}}_{i}C}{v_9})}]---\left(2.11\right)$

Set up the functional relation of video subjective quality and communication link bandwidth thus.

In the present embodiment, adopting linear cost function expression formula, is the service performance parameter with the video subjective quality, the bandwidth under the obtaining communication Service Operation maximum revenue prerequisite.Suppose to use r _i(V _Qi) expression cost function, then the relational expression of video subjective quality and cost function can for:

r _i(V _qi)＝b _i-k _i/V _qi (2.12)

B wherein _iAnd k _iBe the parameter of cost function, b _i＞0, k _i＞0.Usually if the priority of communication link i is higher than communication link j, b is arranged then _i＞b _j, k _i＞k _j, under this price strategy, the user that priority is high more will pay high more expense, simultaneously, when Virtual network operator can not satisfy the high more user's of priority QoS demand, then will pay high more compensation.

Wherein, the communication service running income is to adopt the communication service running income of unit interval to measure, and represents the communication service running income that Virtual network operator obtains with REV, and then the relational expression of communication service running income and cost function can be expressed as:

$\mathrm{REV}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_i{r}_i\left(V_{\mathrm{qi}}\right)---\left(2.13\right)$

The functional relation of cost function and communication link bandwidth will be obtained in formula (2.11) the substitution formula (2.12), in the functional relation substitution formula (2.13) with cost function and communication link bandwidth, can set up the functional relation of communication service operator income and communication link bandwidth then.

Utilize formula (2.13), obtain the optimization solving equation and be:

$\max \mathrm{REV}=\max \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_i{r}_i\left(V_{\mathrm{qi}}\right)---\left(2.14\right)$

Wherein on optimum point, satisfy:

${\mathrm{\&Sigma;}}_{i=1}^n{\mathrm{\&omega;}}_i=1,{\mathrm{\&omega;}}_i\&le;1,{\mathrm{\&omega;}}_i\&Element;\left(\mathrm{0,1}\right]---\left(2.15\right)$

Utilization is based on the optimization algorithm of Lagrange multiplier, and according to formula (2.14) and (2.15), the structure Lagrange's equation is as follows:

$p=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_i{r}_i\left(V_{\mathrm{qi}}\right)+\mathrm{\&sigma;}(1-\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&omega;}}_i)---\left(2.16\right)$

In formula (2.16), for each ω _i, the partial differential of getting p

And make p equal 0, calculate ω _iWith the communication service running income.When the second-order partial differential coefficient of formula (2.16) strict with 0 or strict in (0,1) less than 0 o'clock, ω _iUnique optimal solution is arranged in (0,1).Because ω _iDetermined between each communication link, to distribute the ratio of bandwidth, thus can carry out allocated bandwidth according to the optimal solution of determining, and then the bandwidth of communication link is set, finish allocated bandwidth.

Except above-mentioned bandwidth allocation scheme when monitoring the network bandwidth resources minimizing, can also comprise the bandwidth allocation scheme when user communication terminal inserts in other embodiments, as shown in Figure 2, flow chart for bandwidth allocation methods embodiment user communication terminal of the present invention inserts specifically comprises the steps:

Step 201, when new user communication terminal request access network, receive the access request of user communication terminal;

Step 202, according to the priority of user communication terminal, the access control table that inquiry is preserved obtains distributing to bandwidth minimum, maximum value bandwidth and the bandwidth initial value of user communication terminal;

Step 203, determine whether to accept the access request of user communication terminal according to network bandwidth resources; When the network remaining bandwidth can not satisfy the bandwidth needs of user communication terminal, then refusal inserted request, in the time can satisfying, then allow to insert request, specifically, when the network remaining bandwidth is distributed to the bandwidth initial value of user communication terminal more than or equal to needs, allow to insert request.

For the user communication terminal of different priorities, need different bandwidth resources, therefore, in MGC, preserve the access control table in advance, MGC carries out access control according to this access control table, and above-mentioned steps 202 comprises:

Step 2021, according to inserting request, by the priority of application layer inquiring user communication terminal;

Step 2022, from the access control table, obtain the qos parameter of corresponding network layer according to the priority of user communication terminal, and obtain transport layer parameters according to qos parameter;

Step 2023, according to transport layer parameters, obtain bandwidth minimum, maximum value bandwidth and the bandwidth initial value that need distribute to user communication terminal.

The access control table of preserving in advance among the above-mentioned MGC comprises mapping table (as shown in table 5), network layer parameter and transport layer parameters mapping table (as shown in table 6) and the transport layer parameters and the bandwidth value mapping table (as shown in table 7) of user communication terminal priority and network layer qos parameter.

The mapping table of table 5. communication terminal priority and network layer qos parameter

Table 6. network layer parameter and transport layer parameters mapping table

Table 7. transport layer parameters and bandwidth value mapping table

For example, MGC at first by the priority of application layer inquiring user communication terminal, has preserved the precedence information of user communication terminal in the application layer after the access request that receives user communication terminal; According to the priority of user communication terminal, question blank 5 obtains the pairing network layer qos parameter of the priority (L of user communication terminal _nD _nC _n); According to network layer parameter, question blank 6 obtains corresponding transport layer parameters (CO _n); According to transport layer parameters, question blank 7 obtains the required bandwidth minimum (B that distributes to user communication terminal _Nmin), maximum value bandwidth (B _Nmax) and bandwidth initial value (B _Ninit), wherein, the bandwidth minimum (B of user communication terminal _Nmin), maximum value bandwidth (B _Nmax) and bandwidth initial value (B _Ninit) can be configured setting according to user profile such as user gradations.

In the present embodiment, bandwidth allocation scheme when user communication terminal inserts is utilized MGC control media gateway (Media Gateway, MG), and to required bandwidth minimum, maximum value bandwidth and the bandwidth initial value of MG distributing user communication terminal, be convenient to the allocation strategy that MG carries out MGC, realize the allocated bandwidth of MG.

In the communication process after the user communication terminal access network, MGC monitors the communication quality of user communication terminal, when the priority that monitors certain user communication terminal higher, perhaps the packet loss of the employed communication link of user communication terminal is higher, and the receiving velocity of the Business Stream on this communication link is not when descending, the reduction that MGC judges QoS is not that the bandwidth deficiency causes, and then adopts the strategy that guarantees single channel service quality to distribute bandwidth.Specifically, MGC can require transmit leg (Forward Error Correction is hereinafter to be referred as FEC) protection algorithm, in order to improve user's video quality for this communication link uses forward error correction.Because the bandwidth that transmit leg distributes for each communication link is certain, use FEC protection algorithm can cause video frequency coding rate to descend to some extent, promptly there is following relational expression:

Bandwidth=video frequency coding rate that every road video distribution arrives+FEC protective redundancy code check

In sum, present embodiment utilizes MGC control MG, and gives required bandwidth minimum, maximum value bandwidth and the bandwidth initial value of MG distributing user communication terminal when the user communication terminal access network, is convenient to realize that the adaptive bandwidth of MG distributes; For the QoS that guarantees user communication terminal and the distribution total optimization of the resource that guarantees network bandwidth, after the user communication terminal access network, MGC also will monitor the communication quality of user communication terminal, when monitoring network condition, MGC changes, when particularly monitoring the receiving velocity decline that causes the recipient because of network bandwidth resources is not enough, provide assurance bandwidth resources integral dispensing optimized scheme, promptly at first that each communication link is shared bandwidth drops to the required bandwidth minimum of user communication terminal, progressively change the bandwidth currency of communication link then by certain strategy, guarantee effective utilization of bandwidth resources, for user communication terminal provides stable service, thus the service quality of assurance user communication terminal; Say that further present embodiment is the service performance parameter with the video subjective quality, considered the isoparametric influence of packet loss, video frame rate and video code bit rate, energy concentrated expression real-time video telecommunication service quality; In addition, the reduction of judging QoS as MGC is not that the bandwidth deficiency causes, and then adopts the strategy that guarantees single channel service quality to distribute bandwidth.The bandwidth allocation methods of present embodiment is widely used in guaranteeing under the various packet network environment situation of the QoS of video communication.

As shown in Figure 3, the schematic diagram for allocated bandwidth device embodiment of the present invention specifically comprises: monitoring modular 1, be used for the monitoring network bandwidth resources, and determine current network bandwidth resources situation; Minimum value is provided with module 2, is used to obtain the current network bandwidth resources situation of monitoring modular 1, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into the bandwidth minimum corresponding with each communication link; First acquisition module 3, be used to obtain the current network bandwidth resources situation of monitoring modular 1, when minimum value is provided with the adjusted network bandwidth resources of module 2 and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs; First distribution module 4 is used for the bandwidth increments according to first acquisition module 3, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

Wherein first acquisition module 3 can comprise: judging unit 31 is used to judge whether the bandwidth currency of communication link reaches the bandwidth initial value; Increment unit 32, be used for result according to described judging unit 31, if the bandwidth currency of communication link does not reach the bandwidth initial value, according to bandwidth currency, maximum value bandwidth and the video subjective quality of communication link, obtain the bandwidth increments of the communication link needs that do not reach the bandwidth initial value.

Present embodiment can also comprise: second acquisition module 5, be used to obtain the current network bandwidth resources situation of monitoring modular 1, when minimum value is provided with module 2 adjusted network bandwidth resources and does not improve, according to price strategy, according to packet loss, video frame rate, video code bit rate and cost function, the bandwidth of communication link when determining the maximization of communication service running income; Second distribution module 6, the bandwidth of communication link is carried out allocated bandwidth during the communication service running incomes maximization that is used for determining according to described second acquisition module 5.

Present embodiment can also comprise: receiver module 7 is used to receive the access request of user communication terminal; Parameter acquisition module 8 is used for the priority according to the user communication terminal of described request access, inquires about the access control table of preserving, and obtains bandwidth minimum, maximum value bandwidth and the bandwidth initial value of described user communication terminal; Access module 9 is used for determining whether to accept according to described bandwidth minimum, maximum value bandwidth, bandwidth initial value and network bandwidth resources the access request of described user communication terminal.

Wherein parameter acquisition module 8 can comprise: application layer acquiring unit 81 is used for according to described access request, the priority of inquiring about described user communication terminal by application layer; Network layer acquiring unit 82 is used for obtaining according to the priority of described user communication terminal the QoS parameter of corresponding network layer; Transport layer acquiring unit 83 is used for obtaining transport layer parameters according to QoS parameter; Bandwidth acquiring unit 84 is used for according to described transport layer parameters, obtains bandwidth minimum, maximum value bandwidth and the bandwidth initial value that need distribute to described user communication terminal.

In sum, present embodiment distributes its required bandwidth minimum, maximum value bandwidth and bandwidth initial value by parameter acquisition module 8 to user communication terminal when the user communication terminal access network, is convenient to realize that the adaptive bandwidth of MG distributes; For the QoS that guarantees user communication terminal and the distribution total optimization of the resource that guarantees network bandwidth, after the user communication terminal access network, also to monitor the communication quality of user communication terminal, change when monitoring network condition, when particularly monitoring the receiving velocity decline that causes the recipient because of network bandwidth resources is not enough, can guarantee bandwidth resources integral dispensing optimization by first acquisition module 3 and first distribution module 4, guarantee effective utilization of bandwidth resources, for user communication terminal provides stable service, thus the service quality of assurance user communication terminal; Further, present embodiment is the service performance parameter with the video subjective quality, has considered the isoparametric influence of packet loss, video frame rate and video code bit rate, can concentrated expression real-time video telecommunication service quality.The allocated bandwidth device of present embodiment is widely used in guaranteeing under the various packet network environment situation of the QoS of video communication.

As shown in Figure 4, structure chart for allocated bandwidth system embodiment of the present invention, this system comprises: transmit leg media gateway MG41, receiving method, medium gateway MG42 and media gateway controller MGC 43, wherein MGC43 can comprise: monitoring modular 431, be used to monitor the network bandwidth resources between transmit leg MG and the recipient MG, determine current network bandwidth resources situation; Minimum value is provided with module 432, be used to obtain the current network bandwidth resources situation of monitoring modular 431, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link between transmit leg MG41 and the recipient MG42 is adjusted into the bandwidth minimum corresponding with each communication link; First acquisition module 433, be used to obtain the current network bandwidth resources situation of monitoring modular 431, when minimum value is provided with the adjusted network bandwidth resources of module 432 and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs; First distribution module 434 is used for the bandwidth increments according to first acquisition module 433, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

MGC in the present embodiment can be the arbitrary allocated bandwidth device described in the embodiment of the invention allocated bandwidth device.

In the present embodiment, when monitoring module monitors reduces to network bandwidth resources, at first the bandwidth with each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link, and then according to the bandwidth resources situation that can provide, priority order from high to low according to each communication link, the network remaining bandwidth is distributed to each communication link successively, thereby can guarantee bandwidth resources integral dispensing optimization, and then guarantee network service quality.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is when carrying out, execution comprises the step of said method embodiment, and aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above embodiment only in order to the technical scheme of the explanation embodiment of the invention, is not intended to limit; Although the embodiment of the invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the embodiment of the invention.

Claims (14)

1, a kind of bandwidth allocation methods is characterized in that comprising:

When monitoring network bandwidth resources when reducing,, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link according to the preset bandwidth minimum value;

Improve if adjust the back network bandwidth resources,, obtain the bandwidth increments that each communication link needs then according to the maximum value bandwidth and the video subjective quality of each communication link;

According to described bandwidth increments,, the network remaining bandwidth is distributed to each communication link successively according to the priority order from high to low of each communication link.

2, bandwidth allocation methods according to claim 1 is characterized in that, described maximum value bandwidth and video subjective quality according to each communication link, and the bandwidth increments that obtaining each communication link needs comprises:

Whether the bandwidth currency of judging each communication link is less than its corresponding bandwidth initial value, if bandwidth currency, maximum value bandwidth and video subjective quality according to described communication link obtain the required bandwidth increments of described communication link.

3, bandwidth allocation methods according to claim 2 is characterized in that also comprising: according to packet loss, video frame rate and the video code bit rate of communication link, determine the video subjective quality of described communication link.

4, bandwidth allocation methods according to claim 1 is characterized in that also comprising: do not improve if adjust the back network bandwidth resources, then distribute bandwidth according to price strategy.

5, bandwidth allocation methods according to claim 4 is characterized in that, describedly distributes bandwidth to comprise according to price strategy:

According to packet loss, video frame rate, video code bit rate and cost function, set up the functional relation of communication service running income and communication link bandwidth;

According to optimization algorithm, the bandwidth of communication link when determining the maximization of communication service running income.

6, according to the arbitrary described bandwidth allocation methods of claim 1-5, it is characterized in that, also comprise before reducing in the described network bandwidth resources that monitors:

Receive the access request of user communication terminal;

According to the priority of described user communication terminal, inquire about the access control table of preserving, obtain distributing to bandwidth minimum, maximum value bandwidth and the bandwidth initial value of described user communication terminal;

Determine whether to accept the access request of described user communication terminal according to network bandwidth resources.

7, bandwidth allocation methods according to claim 6, it is characterized in that, described priority according to user communication terminal, the access control table that inquiry is preserved, obtain bandwidth minimum, maximum value bandwidth and the bandwidth initial value that need distribute to described user communication terminal and comprise:

According to described access request, the priority of inquiring about described user communication terminal by application layer;

According to the access control table that the priority inquiry of described user communication terminal is preserved, obtain the QoS parameter of corresponding network layer, and obtain transport layer parameters according to QoS parameter;

Access control table according to described transport layer parameters inquiry is preserved obtains bandwidth minimum, maximum value bandwidth and the bandwidth initial value that need distribute to described user communication terminal.

8, according to the arbitrary described bandwidth allocation methods of claim 1-5; it is characterized in that; also comprise: when the priority that monitors user communication terminal higher; perhaps the packet loss of the employed communication link of user communication terminal is higher; and the receiving velocity of the Business Stream on the described communication link adopts forward error correction protection algorithm to carry out data protection when not descending.

9, a kind of allocated bandwidth device is characterized in that comprising:

Monitoring modular is used for the monitoring network bandwidth resources, determines current network bandwidth resources situation;

Minimum value is provided with module, is used to obtain the current network bandwidth resources situation of monitoring modular, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link;

First acquisition module, be used to obtain the current network bandwidth resources situation of monitoring modular, when minimum value is provided with the adjusted network bandwidth resources of module and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs;

First distribution module is used for the bandwidth increments according to described first acquisition module, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

10, allocated bandwidth device according to claim 9 is characterized in that, described first acquisition module comprises:

Judging unit is used to judge whether the bandwidth currency of communication link reaches the bandwidth initial value;

Increment unit, be used for result according to described judging unit, if the bandwidth currency of communication link does not reach the bandwidth initial value,, obtain the bandwidth increments of the communication link needs that do not reach the bandwidth initial value according to bandwidth currency, maximum value bandwidth and the video subjective quality of communication link.

11, allocated bandwidth device according to claim 9 is characterized in that, described device also comprises:

Second acquisition module, be used to obtain the current network bandwidth resources situation of monitoring modular, when minimum value is provided with the adjusted network bandwidth resources of module and does not improve, according to price strategy, according to packet loss, video frame rate, video code bit rate and cost function, the bandwidth of communication link when determining the maximization of communication service running income;

Second distribution module, the bandwidth of communication link was carried out allocated bandwidth when the communication service running income that is used for determining according to described second acquisition module maximized.

12, according to the arbitrary described allocated bandwidth device of claim 9-11, it is characterized in that described device also comprises:

Receiver module is used to receive the access request of user communication terminal;

Parameter acquisition module is used for the priority according to the user communication terminal of described request access, inquires about the access control table of preserving, and obtains bandwidth minimum, maximum value bandwidth and the bandwidth initial value of described user communication terminal;

Access module is used for determining whether to accept according to described bandwidth minimum, maximum value bandwidth, bandwidth initial value and network bandwidth resources the access request of described user communication terminal.

13, allocated bandwidth device according to claim 12 is characterized in that, described parameter acquisition module comprises:

The application layer acquiring unit is used for according to described access request, the priority of inquiring about described user communication terminal by application layer;

The network layer acquiring unit is used for obtaining according to the priority of described user communication terminal the QoS parameter of corresponding network layer;

The transport layer acquiring unit is used for obtaining transport layer parameters according to QoS parameter;

The bandwidth acquiring unit is used for according to described transport layer parameters, obtains bandwidth minimum, maximum value bandwidth and the bandwidth initial value that need distribute to described user communication terminal.

14, a kind of allocated bandwidth system is characterized in that comprising: transmit leg media gateway, receiving method, medium gateway and Media Gateway Controller; Described Media Gateway Controller comprises:

Monitoring modular is used to monitor the network bandwidth resources between described transmit leg media gateway and the described receiving method, medium gateway, determines current network bandwidth resources situation;

Minimum value is provided with module, is used to obtain the current network bandwidth resources situation of monitoring modular, when network bandwidth resources reduces, according to the preset bandwidth minimum value, the bandwidth of each communication link is adjusted into and the corresponding bandwidth minimum of described each communication link;

First acquisition module, be used to obtain the current network bandwidth resources situation of monitoring modular, when minimum value is provided with the adjusted network bandwidth resources of module and improves, according to bandwidth currency, maximum value bandwidth and the video subjective quality of each communication link, obtain the bandwidth increments that each communication link needs;

First distribution module is used for the bandwidth increments according to described first acquisition module, according to the priority order from high to low of each communication link, the network remaining bandwidth is distributed to each communication link successively.

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