CN102711179B - Multi-service dynamic bandwidth distribution method under heterogeneous wireless network environment - Google Patents

Abstract

The invention belongs to wireless communication technology field, disclose the Multi-service dynamic bandwidth distribution method under a kind of heterogeneous wireless network environment, comprising: S1, when receiving the access request of business, collecting the multiple domain information of each network; S2, classifies to the business of request access, is divided into variable bit rate VBR business and fixed bit rate CBR business, according to the characteristic of VBR business, formulates VBR service bandwidth and distributes planning strategy; S3, chooses corresponding analytic hierarchy process (AHP) discrimination matrix, and application level analytic approach calculates the adaptability factor of each accessible network adaptive; S4, for heterogeneous networks state, application utility function sets up the effectiveness fair bandwidth allocation strategy introducing the adaptability factor, and multiple network is for asking access service distribution strip wide.What the invention solves that user fairness guarantee and systematic function promote takes into account problem, makes full use of the overall performance of isomerism with elevator system of network, effectively improves resource utilization ratio.

Description

Multi-service dynamic bandwidth distribution method under heterogeneous wireless network environment

Technical field

The invention belongs to wireless communication technology field, be specifically related to the Multi-service dynamic bandwidth distribution method under a kind of heterogeneous wireless network environment.

Background technology

According to the difference of service feature and user's request, there is diversified wireless access technology.The flourish future broadband wireless communication systems that makes of various wireless communication technology presents isomerization general layout.Along with the evolution of ICT (information and communication technology), Radio Access Network is towards the trend development of high speed, broadband, ubiquitousization.In the face of the Radio Access Network that numerous characteristic like this is totally different, how to design unified network resources for wireless communication management strategy and fully contain them, the real radio-resource-configuration fundamentally realizing flexibly, optimize, for user provides seamless, high-quality abundant business to experience, it is the hot issue of current heterogeneous network research.

Different Radio Access Networks has larger difference in the network coverage, professional ability, use cost, type service, speed and QoS (service quality) require also to be not quite similar, if user is within the scope of the alternate covering of multiple Radio Access Network simultaneously, just need to use a kind of network insertion to combine based on certain strategy or Standard Selection.Simultaneously, in hot spot coverage, due to the increase of number of users and business load, load imbalance between resource scarcity or network may be caused, thus cause service blocking rate and drop rate significantly to increase, this not only can affect the business experience of user, also a large amount of consumption of resource can be caused, how to realize the load balancing between heavy duty lower network, in heterogeneous network situation, how to ensure the user fairness sex chromosome mosaicism caused due to network coverage inequality, how to ensure the efficient efficiency of the bandwidth usage of different radio access network, increase network capacity and avoid network overload, optimize resource distribution in joint radio resource management, realize the allocated bandwidth under heterogeneous wireless access environment, the efficiency utilization of Radio Resource, the reasonable solution of user fairness and meeting in time of customer service demand, larger challenge is proposed to heterogeneous network allocation of radio resources.

Summary of the invention

(1) technical problem that will solve

For the defect existed in existing resource allocative decision and deficiency, the object of this invention is to provide the Resource Allocation Formula under a kind of heterogeneous wireless network environment, the Multi net voting allocated bandwidth of user's requested service is embodied content that user fairness and network performance promote two aspects, namely ensureing under the prerequisite that user QoS fairness requires, the efficiency utilization of heterogeneous network resource is realized.

(2) technical scheme

For achieving the above object, the invention provides the Multi-service dynamic bandwidth distribution method under a kind of heterogeneous wireless network environment, comprising the following steps:

S1, when receiving the access request of business, collects the multiple domain information of each network, and carries out the information categorization in multiattribute territory to described multiple domain information;

S2, the business of request access is classified, be divided into variable bit rate VBR business and fixed bit rate CBR business, according to the characteristic of VBR business, formulate VBR service bandwidth and distribute planning strategy, for VBR business, utilize VBR service bandwidth to distribute planning strategy and calculate by multiple network allocation to its total bandwidth;

S3, application network state dynamic thresholding method, for heterogeneous networks state, chooses corresponding analytic hierarchy process (AHP) discrimination matrix, applies the adaptability factor that the analytic hierarchy process (AHP) obtained according to described multiple domain information obtains each accessible network adaptive;

S4, for heterogeneous networks state, application utility function sets up the effectiveness fair bandwidth allocation strategy introducing the adaptability factor, and multiple network is for asking access service distribution strip wide.

Preferably, described multiple domain information comprises the accessible network collection of request access service, and the service quality QoS parameter of network in described accessible network collection, qos parameter comprises user fairness and embodies parameter and the parameter promoting demand for embodying network performance, accordingly, the information categorization carrying out multiattribute territory is specially the parameter that to be divided into by qos parameter for embodying user fairness and is used for embodying the parameter that network performance promotes demand.

Preferably, the user fairness of heterogeneous wireless network is embodied in, when spreadability relatively on a large scale access network a Multi net voting overlap cover region is consumed in a large number among a small circle relatively time, for the access user that periphery only has the access network of spreadability on a large scale to cover, user fairness reduces; The described parameter promoting demand for embodying network performance comprises for embodying the throughput of network, the parameter of blocking rate.

Preferably, in step S2, according to type of service and bandwidth demand scope, the business to request access divides, and being that the delineation of activities of fixed bit rate is CBR business by bandwidth demand, is that the delineation of activities of variable bit rate is VBR business by bandwidth demand.

Preferably, described VBR service bandwidth distributes planning strategy and is: add up existing all VBR service bandwidths of the business region of request access and be averaging, the mean value obtained is as the desired value of newly arrived VBR business by the total bandwidth of multiple network allocation.

Preferably, in step S3, according to the height of network load level, set up the analytic hierarchy process (AHP) discrimination matrix of corresponding heterogeneous networks state.

Preferably, between step S2 and step S3, according to the coverage property of heterogeneous wireless network, the multiple Radio Access Network in a covering region is divided into two classes, the first kind is the minimum area Radio Access Network covering this region, and Equations of The Second Kind is other Radio Access Network covering this region; In step S3, described network state dynamic thresholding method is specially: according to the load level of Equations of The Second Kind Radio Access Network, dynamic conditioning for adjudicating the threshold value of first kind Radio Access Network load condition, to ensure user fairness sexual demand.

Preferably, described utility function for weigh network to new arrival business distribute the quantitative relationship of bandwidth and access network performance change, in step S4, first the bandwidth quantification that business is assigned with by utility function is applied, then effectiveness fair bandwidth allocation strategy is utilized network state to be divided into full load and low load two kinds of situations, according to following principle computation bandwidth ratio under low loading condition: VBR service bandwidth distribute target with first to arrive VBR traffic assignments target identical, CBR business distributes bandwidth according to bandwidth demand; According to following principle computation bandwidth ratio in full load situation: the business accepting to serve reduces own bandwidth to be supplied to newly arrived business according to fair principle, if do not meet minimal bit rate requirement after reducing bandwidth, then blocks newly arrived business.

Preferably, whether corresponding according to region wireless access network can receive new business network state to be divided into full load and low load two kinds of situations.

(3) beneficial effect

Compared with prior art, the resource allocation methods that the present invention proposes, multiple subflow business is divided into transmit on different networks, not only achieve taking into account of user QoS fairness and network system performance under isomery scene, and take full advantage of the transmittability of Radio Access Network under heterogeneous wireless environment, efficiency utilization Internet resources, thus optimize the performance of system.

Accompanying drawing explanation

Fig. 1 is the isomerous environment Multi net voting overlay area scene schematic diagram of the embodiment of the present invention;

Fig. 2 is many discrimination matrix AHP Model structural representation under the heterogeneous wireless access scene of the embodiment of the present invention;

Fig. 3 is the schematic flow sheet of resource allocation methods under the heterogeneous wireless scene of the embodiment of the present invention;

Fig. 4 be the scheme of the embodiment of the present invention compared with load balancing, draw the comparison diagram of zones of different user blocking rate in system operation time;

Fig. 5 be the scheme of the embodiment of the present invention compared with load balancing, draw the comparison diagram of the total blocking rate of heterogeneous network system in system operation time.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.

Fig. 1 shows the scene of heterogeneous wireless network in the present embodiment, in the network configuration frame model of the present embodiment application, the geographic area considered is covered completely by wireless MAN (WMAN), 3G Radio Access Network base station and a region, cover part, WLAN (wireless local area network) (WLAN) hot-zone.Region A1 only has the covering of wireless MAN to exist, and region A2 is covered by wireless MAN (WMAN) and 3G network, and region A3 is covered jointly by three kinds of networks.Wireless MAN (WMAN) is based on IEEE 802.16e agreement, and spectral range 2-66GHz, is affected by the factor such as transmission bandwidth and modulation coding mode, supports the business datum shrinkage of 10-100M.3G Radio Access Network is based on the access technology of TD-SCDMA (Time Division-Synchronous CodeDivision Multiple Access), and power system capacity is 2Mbps.Wlan network is based on IEEE 802.11 agreement, and maximum bandwidth supports 11Mbps.In the present embodiment, suppose that mobile terminal can access Radio Access Network corresponding to its region, and on the basis that power controls, the Radio Access Network transmission rate in overlay area is uniformly distributed.

The Multi net voting cooperation transmission resource allocation methods that the present embodiment is mentioned has considered the effect of the parameter embodying user QoS fairness and embody network system performance boost two aspect, and carry out Multifactor Decision Making according to heterogeneous networks load level application dynamic threshold and comprehensive two aspects of many discrimination matrix analytic hierarchy process (AHP), thus show that equilibrium takes into account the Resource Allocation Formula of two aspects.

In the present embodiment, region A1, A2, A3 customer service obeys Poisson distribution the time of advent, and its arrival rate mean value is as shown in table 1, and the service time of user access network obeys quantum condition entropy.

The arrival rate of table 1 zones of different

As shown in Figure 3, resource allocation methods under the heterogeneous wireless network of the embodiment of the present invention, specifically comprises the following steps:

S1, user terminal sends access request, triggers the multiple domain information of each Radio Access Network, and carries out the information categorization in multiattribute territory to described multiple domain information.Collection embodiment user fairness and wireless network performance promote the contextual information of two aspects.In the present embodiment, the access that user QoS fairness is mainly reflected in the network edge of access property on a large scale user is fair, when to cover Radio Access Network on a large scale and consumed in a large number in the zonule that certain Multi net voting overlap covers, only have access network on a large scale to carry out the access user covered for periphery, user fairness reduces; Wireless network performance promotes demand and is embodied in, the lifting of the network side performance parameter such as throughput, blocking rate of Multi net voting heterogeneous system.

In the present embodiment, concrete content of collecting following four parameters:

The parameter of demand is promoted: wireless access network system capacity C and wireless network present available capacity C ' for embodying wireless network performance.Wireless access network system capacity C represents the intrinsic bearing capacity of network and network can the potentiality of bearer service load, and C ' represents that Radio Access Network is current can the ability of carry load level.

User fairness embodies parameter: customer service density p corresponding to the overlay area area S of Radio Access Network and Radio Access Network institute overlay area.In order to ensure the fairness of overlay network edge customer on a large scale, when the business being in Multi net voting overlay area among a small circle distributes bandwidth from Multi net voting, the bandwidth of this zonule property overlay network preferentially should be used; In like manner, when the traffic density of Multi net voting overlay area among a small circle increases, this region should be reduced and distribute bandwidth ratio from access network on a large scale, to reduce the luxus consumption to the network bandwidth on a large scale of region among a small circle.

S2, to summarize classifications to request wireless traffic, is divided into variable bit rate VBR business and fixed bit rate CBR business, according to the characteristic of VBR business, formulates VBR service bandwidth distribution planning strategy;

Wherein, according to type of service and bandwidth demand scope, divide the business (referred to as requested service) of request access, being that the delineation of activities of fixed bit rate is CBR business by demand bandwidth, is that the delineation of activities of variable bit rate is VBR business by bandwidth demand.Such as, voice service requires fixed rate bandwidth, and online waits the supply of its bandwidth of some background service more flexible.In the present embodiment, the fixed-bandwidth demand of CBR business is the bandwidth demand of 256Kbps, VBR business is 256Kbps to 512Kbps.

For VBR business, first need to distribute planning strategy according to VBR service bandwidth and calculate the total bandwidth being distributed to VBR service request by heterogeneous networks, VBR service bandwidth distributes all VBR service bandwidths of planning strategy statistics requested service region and is averaging, distributed the desired value of total bandwidth as the new VBR of arrival business by Multi net voting, be specially:

For first the VBR business arrived in a kth region, using the maximum bandwidth demand of this first VBR business as described desired value B _{n+1, k}, that is:

$N_2=0,B_{N+1,k}=B_{\max }^{\mathrm{VBR}}---\left(1\right)$

Wherein, N represents the business sum that this region is current, and namely N+1 can be expressed as the new for business of current region, N ₂for the VBR number of services in a corresponding kth region, B _{n+1, k}for newly arriving the distribution bandwidth target of VBR business, for the required maximum bandwidth of VBR business.B _{n+1, k}jointly provide bandwidth by the multiple networks covering this region, suppose to co-exist in m heterogeneous radio access networks network in this region, then:

$B_{B+1,k}=\underset{i}{\mathrm{\Σ}}{b}_{i,N+1,k}i=\mathrm{1,2},...,m---\left(2\right)$

In formula, b _{i, N+1, k}for being newly to the bandwidth of VBR traffic assignments by i-th Radio Access Network.

VBR service conditions is existed for a kth region:

$N_2>0,B_{N+1,k}=\underset{n}{\mathrm{\Σ}}{B}_{n,k}/N_2,n=\mathrm{1,2},...N_2---\left(3\right)$

Based on this, compared with VBR business already present in a kth region, newly arrived VBR business obtains the desired value of allocated bandwidth liberally.

S3, application network state dynamic thresholding method, for the load level of heterogeneous networks, chooses corresponding analytic hierarchy process (AHP) discrimination matrix, applies the adaptability factor parameter that many discrimination matrix analytic hierarchy process (AHP) calculates each accessible wireless network adaptive;

Many discrimination matrix analytic hierarchy process (AHP):

According to above to the discussion of user fairness in the present embodiment, application level analytic approach calculates the adaptability of each Radio Access Network adaptive because of the period of the day from 11 p.m. to 1 a.m, the factor of network system performance boost and user fairness two aspect should be considered, and adjust dynamically in real time according to the conversion of these factors.

According to the two class network parameters collected at the present embodiment step S1, set up analytic hierarchy process (AHP) algorithm model (as shown in Figure 2), comprehensively described four parameters finally calculate the adaptability factor parameter of each Radio Access Network characteristic adaptive.The discrimination matrix of solution layer and rule layer, mainly based on empirical data or the management tactics of operator, can be arranged by artificial carrying out.And the discrimination matrix between rule layer and destination layer is mainly arranged relative to the importance of the adaptability factor based on fairness parameter and network system performance parameter.

Network load level is divided into high, medium and low three states, in AHP Model, rule layer is set as W respectively relative to the discrimination matrix W of destination layer ^h, W ^m, W ^l, corresponding with high, medium and low three network states.

Further analysis is known, when network is in low load, and the new business of all arrival, comprise CBR business and VBR business, all can obtain bandwidth according to maximum bandwidth demand, therefore, when heterogeneous network system bandwidth level is not high, the requirement of network system performance boost aspect preferentially should be met; And when heterogeneous network system is in high capacity, overlay network certainly will cause the high blocking rate of edge customer at the luxus consumption of Multi net voting overlay area among a small circle on a large scale, therefore, when heterogeneous network system is in high capacity, the parameter importance that fairness is relevant promotes.

Therefore, by separating the discrimination matrix of rule layer and destination layer, show that rule layer four network parameters are w=[w relative to the importance of the adaptability factor _c', w _s, w _ρ, w _c].And corresponding three network states, when load level raises, the importance of fairness parameter promotes, and embodies the importance reduction that network performance promotes parameter, the importance demand fulfillment namely solved:

$w_c^l+w_{c^{\′}}^l\≥w_c^m+w_{c^{\′}}^m\≥w_c^h+w_{c^{\′}}^h---\left(4\right)$

$w_s^l+w_{\mathrm{\ρ}}^l\≤w_s^m+w_{\mathrm{\ρ}}^m\≤w_s^h+w_{\mathrm{\ρ}}^h---\left(5\right)$

Dynamic thresholding method:

Threshold value determines the key factor of the discontinuous state of network, namely utilizes threshold value network to be divided into high, medium and low three states, and definite threshold is the committed step dividing these three states.The present embodiment introduces the concept of dynamic threshold, ensures the fairness of user further.

According to the coverage property of heterogeneous network, the multiple Radio Access Network in a covering region is divided into two classes, the first kind is the minimum area Radio Access Network covering this region, and second is other Radio Access Network covering this region.As shown in fig. 1, for region A3 user, WiMax network and cellular network belong to Equations of The Second Kind network, and wlan network belongs to first kind network.

In the present embodiment, consider that a kth region is covered by m kind Radio Access Network, wherein, the n-th network is the minimum network of area coverage in this region of covering, i.e. first kind network. that Equations of The Second Kind network is for judging the threshold value that network state is applied; ${\mathrm{\θ}}_1^h,{\mathrm{\θ}}_2^h({\mathrm{\θ}}_1^h\≤{\mathrm{\θ}}_2^h),$ ${\mathrm{\θ}}_1^m,{\mathrm{\θ}}_2^m({\mathrm{\θ}}_1^m\≤{\mathrm{\θ}}_2^m),$ ${\mathrm{\θ}}_1^l,{\mathrm{\θ}}_2^l({\mathrm{\θ}}_1^l\≤{\mathrm{\θ}}_2^l)$ That first kind network (i.e. network n) is for judging the threshold value of network state.

Application dynamic thresholding method chooses the process application following steps of the discrimination matrix W in many discrimination matrix analytic hierarchy process (AHP):

(1), according to Equations of The Second Kind network of network loading level determine the threshold value combination judging first kind offered load state, have three kinds of situations:

$1\≤\∀i\≤\mathrm{mandi}\≠n,{\mathrm{\θ}}_i\≥{\mathrm{\θ}}_2^{\mathrm{classl}},$ Namely, when all Equations of The Second Kind networks are high load condition, first kind load condition discrimination threshold is selected to be combined as

$1\≤\∀i\≤\mathrm{mandi}\≠n,\∃{\mathrm{\θ}}_i\≤{\mathrm{\θ}}_1^{\mathrm{claal}},$ Namely, when to there is Equations of The Second Kind network be low load condition, first kind load condition discrimination threshold is selected to be combined as

When discontented be enough to upper two kinds of situations time, select first kind network for judging that the sets of threshold values of load condition is combined into ${\mathrm{\θ}}_1^m,{\mathrm{\θ}}_2^m({\mathrm{\θ}}_1^m\≤{\mathrm{\θ}}_2^m).$

(2), applying step (1) elect threshold value combination with first kind network load level, determine apply discrimination matrix.Such as, when the selection result of the first step is time, selection course is as follows: time, W=W ^h; time, W=W ^m; time, W=W ^l.

Based on above to the definition of discrimination matrix, discrimination matrix W ^h, W ^m, W ^lload level high, medium and low with network is corresponding respectively, in order to ensure the fairness of user further, when cover one's respective area network is in higher levels of load on a large scale time, first kind network should the choosing of passing threshold, make the discrimination matrix being more prone to select high capacity level corresponding, thus the state entering guarantee edge customer be more prone to, therefore ${\mathrm{\θ}}_1^h,{\mathrm{\θ}}_2^h({\mathrm{\θ}}_1^h\≤{\mathrm{\θ}}_2^h),$ ${\mathrm{\θ}}_1^m,{\mathrm{\θ}}_2^m({\mathrm{\θ}}_1^m\≤{\mathrm{\θ}}_2^m),$ ${\mathrm{\θ}}_1^l,{\mathrm{\θ}}_2^l({\mathrm{\θ}}_1^l\≤{\mathrm{\θ}}_2^l)$ Should meet:

${\mathrm{\θ}}_1^h\≤{\mathrm{\θ}}_1^m\≤{\mathrm{\θ}}_1^l---\left(6\right)$

${\mathrm{\θ}}_2^h\≤{\mathrm{\θ}}_2^m\≤{\mathrm{\θ}}_2^l---\left(7\right)$

S4, application utility function, for heterogeneous networks state, sets up the effectiveness fair bandwidth allocation strategy introducing the adaptability factor, and multiple network is for asking access service distribution strip wide.

In this step, first introduce utility function weigh network to new arrival business distribute the quantitative relationship of bandwidth and access network performance change:

Utility function is economic concept, in economics, in order to represent quantitative relation between the effectiveness that consumer obtains in consumption and the grouping of commodities consumed.From theory, it can approach by a series of psychological test the utility function obtaining everyone.It is used to weigh consumer from the set grouping of commodities of consumption obtain satisfied degree.

In the application of Bandwidth Allocation Policy, definition utility function is monotonically increasing function, and it is in order to represent that the change of network performance and network allocation are to the mapping relations between certain service bandwidth.Application utility function come estimation roughly when system be a connection of newly arriving distribute bandwidth time, on the impact of network performance, thus the bandwidth that business is assigned with quantification.Define grid distribute bandwidth and network obtain effectiveness expression formula be:

U(P)＝ωlog(1+α·P/ε) (8)

In formula, the bandwidth that P distributes for newly arriving business for Radio Access Network, due to heterogeneous network characteristic, need to introduce adaptability factor ε, enable the adaptive heterogeneous networks of utility function, simultaneously, ω, α is invariant, is convenient to the adjustment that utility function does size etc. on the basis of the adaptability factor, the value of utility that U (P) obtains for network allocation bandwidth P.

In effectiveness fair bandwidth allocation strategy, whether the wireless access network system corresponding according to region can receive new business, network state is divided into full load and low load two kinds of situations, in full load situation, the wireless access network system remaining bandwidth corresponding to region can not meet the demand of new arrival business.Strategy in concrete two kinds of situations is:

Under low load condition:

In low load condition, VBR business distributes bandwidth (according to VBR allocated bandwidth planning strategy according to the result of allocated bandwidth planning strategy, when network is in low load, VBR service bandwidth distribute target with first to arrive VBR traffic assignments target identical, namely greatest requirements is distributed), CBR business distributes bandwidth according to bandwidth demand.

Therefore, for CBR and VBR business, when there being new business to arrive, allocated bandwidth meets:

$1\≤\∀i_1,i_{2}m,U_{i_1,N+1,k}\left(b_{i_1,N+1,k}\right)=U_{i_2,N+1,k}\left(b_{i_2,N+1,k}\right)---\left(9\right)$

Therefore, ensured that heterogeneous networks in a kth region is that newly to arrive the value of utility of traffic assignments bandwidth equal.By solving equations (14), (9), (8), (2), and (1) or (3), can solve the bandwidth ratio that new arrival business is distributed by heterogeneous networks:

p _i，N+1，k＝b _i，N+1，k/B _N+1，k(10)

Due to be the invariant in a kth region of i-th network and arrange and known for artificial, therefore, for the new arrival business in a kth region, the adaptability factor of i-th network determine the allocated bandwidth ratio of Multi net voting to new arrival business.

Under full load state:

For full load state, wireless access network system remaining bandwidth corresponding to region can not meet the demand of new arrival business, therefore, the VBR business that region is being served reduces bandwidth to newly arrived business according to fair principle, if VBR business does not meet minimal bit rate requirement after reducing bandwidth, then block newly arrived business.Specifically calculate according to following three steps:

1, newly arrive according to effectiveness fair bandwidth allocation policy calculation the bandwidth that business distributed by heterogeneous networks, its account form is identical with the account form of bandwidth under underload, draws the bandwidth b distributed by wireless access network i (1≤i≤m) _{i, N+1, k}.

2, in each Radio Access Network, the reduction bandwidth that all VBR business of serving are fair according to formula (11) (12), β _{i, j, k}represent for i-th Access Network jth bandwidth that VBR business reduces in a kth region.

$1\≤\∀i\≤m,1\≤\∀j_1,j_2\≤N_2,{\mathrm{\β}}_{i,j_1,k}/b_{i,j_1,k}={\mathrm{\β}}_{i,j_2,k}/b_{i,j_2,k}---\left(11\right)$

$b_{i,N+1,k}=\underset{j}{\mathrm{\Σ}}{\mathrm{\β}}_{i,j,k},j=\mathrm{1,2},...,N_2---\left(12\right)$

If the VBR business of all Access Networks meets formula (13) in a 3 kth region, then this business of access, otherwise, block to fall this business.

$1\≤\∀j\≤N_2,{B^{\′}}_{j,k}=(B_{j,k}-\underset{j}{\mathrm{\Σ}}{\mathrm{\β}}_{i,j,k})\≥B_{\min }^{\mathrm{VBR}}---\left(14\right)$

Thus, by the different disposal mechanism under network underload and network full load state, meet Multi net voting to the new calculating arriving service bandwidth carrying, and effectively make use of Internet resources.

Fig. 4 and Fig. 5 is scheme result compared with load balancing of the embodiment of the present invention.Wherein, under load balancing, the Multi net voting allocated bandwidth ratio of new arrival business is fixed value, and its value is different access networks system bandwidth ratio.Under network reaches full load state, VBR business reduces bandwidth equally and meets new arrival service bandwidth demand.

Fig. 4 be the scheme of the embodiment of the present invention compared with load balancing, draw the comparison diagram of zones of different user blocking rate in system operation time.Can be found by contrast, embodiment suggest plans and all achieve effective reduction of blocking rate in all regions; And the fairness of overlay network edge customer obtains significant guarantee on a large scale.

Fig. 5 be the scheme of the embodiment of the present invention compared with load balancing, draw the comparison diagram of the total blocking rate of heterogeneous network system in system operation time.Can be found by contrast, embodiment is suggested plans and more effectively be make use of heterogeneous network system resource, and system congestion rate significantly reduces.

Can be found out by contrast, resource allocation methods proposed by the invention has better systematic function.

The above is only embodiments of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.

Claims (6)

1. the Multi-service dynamic bandwidth distribution method under heterogeneous wireless network environment, is characterized in that, comprise the following steps:

S1, when receiving the access request of business, collects the multiple domain information of each network, and carries out the information categorization in multiattribute territory to described multiple domain information;

S2, the business of request access is classified, be divided into variable bit rate VBR business and fixed bit rate CBR business, according to the characteristic of VBR business, formulate VBR service bandwidth and distribute planning strategy, for VBR business, utilize VBR service bandwidth to distribute planning strategy and calculate by multiple network allocation to its total bandwidth;

S3, application network state dynamic thresholding method, for heterogeneous networks state, chooses corresponding analytic hierarchy process (AHP) discrimination matrix, applies the adaptability factor that the analytic hierarchy process (AHP) obtained according to described multiple domain information obtains each accessible network adaptive;

S4, for heterogeneous networks state, application utility function sets up the effectiveness fair bandwidth allocation strategy introducing the adaptability factor, and multiple network is for asking access service distribution strip wide;

Wherein, described utility function for weigh network to new arrival business distribute the quantitative relationship of bandwidth and access network performance change, in step S4, first the bandwidth quantification that business is assigned with by utility function is applied, then effectiveness fair bandwidth allocation strategy is utilized network state to be divided into full load and low load two kinds of situations, according to following principle computation bandwidth ratio under low loading condition: VBR service bandwidth distribute target with first to arrive VBR traffic assignments target identical, CBR business distributes bandwidth according to bandwidth demand, heterogeneous networks is made to be that newly to arrive the value of utility of traffic assignments bandwidth equal, according to following principle computation bandwidth ratio in full load situation: the business accepting to serve reduces own bandwidth to be supplied to newly arrived business according to fair principle, if do not meet minimal bit rate requirement after reducing bandwidth, then blocks newly arrived business,

Wherein, in step S3, according to the height of network load level, set up the analytic hierarchy process (AHP) discrimination matrix of corresponding heterogeneous networks state;

Between step S2 and step S3, according to the coverage property of heterogeneous wireless network, the multiple Radio Access Network in a covering region is divided into two classes, and the first kind is the minimum area Radio Access Network covering this region, and Equations of The Second Kind is other Radio Access Network covering this region; In step S3, described network state dynamic thresholding method is specially: according to the load level of Equations of The Second Kind Radio Access Network, dynamic conditioning for adjudicating the threshold value of first kind Radio Access Network load condition, to ensure user fairness sexual demand.

2. the method for claim 1, it is characterized in that, described multiple domain information comprises the accessible network collection of request access service, and the service quality QoS parameter of network in described accessible network collection, qos parameter comprises the parameter for embodying user fairness and promotes the parameter of demand for embodying network performance, accordingly, the information categorization carrying out multiattribute territory is specially the parameter that to be divided into by qos parameter for embodying user fairness and is used for embodying the parameter that network performance promotes demand.

3. method as claimed in claim 2, it is characterized in that, described user fairness is embodied in, when spreadability relatively on a large scale access network a Multi net voting overlap cover region is consumed in a large number among a small circle relatively time, for the access user that periphery only has the access network of spreadability on a large scale to cover, user fairness reduces; The described parameter promoting demand for embodying network performance comprises for embodying the throughput of network, the parameter of blocking rate.

4. the method for claim 1, it is characterized in that, in step S2, according to type of service and bandwidth demand scope, the business to request access divides, be the delineation of activities of fixed bit rate by bandwidth demand being CBR business, is that the delineation of activities of variable bit rate is VBR business by bandwidth demand.

5. the method for claim 1, it is characterized in that, described VBR service bandwidth distributes planning strategy: statistics is asked existing all VBR service bandwidths of the business region of access and is averaging, and the mean value obtained is as the desired value of newly arrived VBR business by the total bandwidth of multiple network allocation.

6. the method as described in any one of claim 1-5, is characterized in that, in described effectiveness fair bandwidth allocation strategy, whether the wireless access network corresponding according to region can receive new business network state to be divided into full load and low load two kinds of situations.