CN101772102A - Selecting method for isomeric wireless network - Google Patents
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- CN101772102A CN101772102A CN200910243968A CN200910243968A CN101772102A CN 101772102 A CN101772102 A CN 101772102A CN 200910243968 A CN200910243968 A CN 200910243968A CN 200910243968 A CN200910243968 A CN 200910243968A CN 101772102 A CN101772102 A CN 101772102A
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Abstract
The invention provides a selecting method for an isomeric wireless network. The selecting method includes the following steps: 1) each access base station regularly reports current network status information thereof to an isomeric access gateway, and the network status information includes transmission bandwidth provided by each access base station; 2) the isomeric access gateway obtains business attribute information of business flows of various types, and the business attribute information includes the transmission bandwidth needed by the business flows; 3) the isomeric access gateway regularly carries out batch processing on the business flows that request switching. The batch processing includes the following: 31) the traversing of each business flow that requests switching; 32) as to each current business flow, the matching degree between the business attribute information of the business flow and the network status information of each access base station is obtained; 33) the access base station with the optimal matching degree is selected as the target base station for the current business flow to enter through switching. The invention can achieve the technical effects of lowering the blocking rate and increasing the resource utilizing rate under the premise of ensuring the service quality.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, the present invention relates to a kind of selecting method for isomeric wireless network.
Background technology
Merging the multiple network technology in the isomery UNE, can provide more more innovative business for the user, is a great development trend of future communications network.At present, the isomery UNE mainly contains isomery UNE that isomery UNE, WLAN and the WiMAX of isomery UNE, UMTS network and the WiMAX network interconnection of the interconnection of 3G network and wlan network interconnect etc.
At isomery UNE environment, portable terminal has a plurality of wireless antennas, when portable terminal present position during simultaneously by a plurality of network coverage, the Business Stream that moves on this portable terminal can select to carry the access network of this Business Stream according to demand, promptly carries out network selecting.At present, the main task of network selecting is exactly to select appropriate network for the operating Business Stream of switching and network access that needs, and avoids the professional problem that big service quality decline takes place at handoff procedure.In the prior art, network selecting is normally decided by portable terminal, and portable terminal directly selects the network of optimum (as the bandwidth maximum) as access network usually, and do not consider the resource utilization of network system integral body, so just cause between heterogeneous networks load extremely unbalanced, the excessive business of load on the good network of performance, cause the blocking rate of whole heterogeneous wireless network system to increase, the network of poor-performing then might then be left unused by unloaded or a large amount of Radio Resources, cause resource utilization to reduce, therefore, press for a kind of selecting method for isomeric wireless network that can improve resource utilization ratio and reduction blocking rate that is used for the isomery coalescing network system.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of selecting method for isomeric wireless network that can improve resource utilization ratio and reduction blocking rate that is used for the isomery coalescing network system.
For achieving the above object, the invention provides a kind of selecting method for isomeric wireless network, this method realizes based on the isomery coalescing network system, described isomery coalescing network system comprises that the access base station of isomery and heterogeneous access networks close, described heterogeneous access networks closes and is used for the access base station of a plurality of isomeries is implemented the network control management, and described selecting method for isomeric wireless network comprises the following steps:
1) heterogeneous access networks closes the network state information that obtains each access base station;
2) heterogeneous access networks closes the business attribute information of obtaining all types of Business Streams;
3) heterogeneous access networks closes regularly the Business Stream of asking to switch is carried out batch processing, and described batch processing comprises: 31) travel through the Business Stream that each request is switched; 32), draw the matching degree of the network state information of the business attribute information of this Business Stream and each access base station to each current business flow; 33) select the access base station of optimal matching degree will switch the target access base station that enters as current business flow.
Wherein, described step 1) also comprises: each access base station regularly closes the current network state information of report self to described heterogeneous access networks.
Wherein, in the described step 1), described network state information comprises the transmission bandwidth that access base station provides; Described step 2) in, described business attribute information comprises the transmission bandwidth that Business Stream is required.
Wherein, message transmission rate, safe class and rate grade that described network state information also comprises access base station and provided, described business attribute information also comprises the needed message transmission rate of Business Stream, safe class and rate grade, and described matching degree is the weighted average of the absolute value of the absolute value of absolute value, safe class difference of absolute value, the message transmission rate difference of the transmission bandwidth difference of network state information and business attribute information and rate grade difference.
Wherein, described selecting method for isomeric wireless network also comprises: step 4) checks that described heterogeneous access networks closes each access base station of being administered and whether transships, to the overload access base station, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, makes described overload access base station transfer nonoverload to.
Wherein, described step 4) comprises following substep:
41) calculate the overload quantity that described heterogeneous access networks closes each access base station of being administered;
42) travel through each access base station successively by overload quantity order from large to small;
43) current access base station is transshipped adjustment, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, make described current access base station transfer nonoverload to, the access base station of described matching degree suboptimum is selected from order comes access base station after current access base station;
44) for last access base station, if this access base station overload then adds the partial service stream that it carried and blocks formation, so that this access base station transfers nonoverload to.
Wherein, described step 43) comprise following substep:
431) find out the Business Stream of matching degree difference minimum in the current access base station and it is adjusted to the access base station of matching degree suboptimum, described matching degree difference be this Business Stream the difference of obtainable Optimum Matching degree and suboptimum matching degree; When the access base station of the matching degree suboptimum of the Business Stream of matching degree difference minimum has overload and adjusts sign, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum; At this moment, in the surplus lines stream of current access base station, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum;
432) judge whether still overload of current access base station,, then re-execute step 431) if still transship; If nonoverload then adds overload and adjusts sign, the overload adjustment of current access base station finishes.
Wherein, described step 431) in, comprise that also preestablishing Business Stream adjusts threshold value, when the matching degree difference of a Business Stream is adjusted threshold value above described Business Stream, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum; At this moment, in the surplus lines stream of current access base station, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum.
Wherein, described step 431) in, when existing two or more matching degree differences to equate simultaneously and during the Business Stream of matching degree difference minimum, preferentially adjusting the wherein bigger Business Stream of occupied bandwidth.
Wherein, described step 4) also comprises step 45), the Business Stream that blocks in the formation is sorted to big by little by shared bandwidth, adjust each Business Stream that blocks in the formation then successively, adjustment process comprises the following steps: 451) check the remaining bandwidth of current each access base station, if exist remaining bandwidth greater than the access base station that blocks the shared bandwidth of first Business Stream in the formation, then described first Business Stream be adjusted to this access base station; Otherwise finish blocking the adjustment of formation; 452) first Business Stream is shifted out the obstruction formation, re-execute step 451).
Wherein, in another scheme, described step 43) whether in, judging has the access base station of the matching degree suboptimum that the Business Stream adjustment enters to transship, if overload, the described Business Stream that adjustment is entered changes the obstruction formation over to; If current access base station nonoverload then stops step 42) ergodic process.
Compared with prior art, the present invention can reach under the prerequisite that guarantees service quality, and reduces the technique effect of blocking rate, raising resource utilization.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 shows the application scenarios of the isomery coalescing network system in the one embodiment of the invention;
Fig. 2 shows a kind of form of network state information report signaling in the one embodiment of the invention;
Fig. 3 shows the overall flow figure of one embodiment of the invention;
Fig. 4 shows the schematic flow sheet of the step 4 in the one embodiment of the invention;
Fig. 5 shows the schematic flow sheet of the step 43 in the one embodiment of the invention;
Fig. 6 shows the schematic flow sheet of the step 45 in the one embodiment of the invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
Fig. 1 shows the application scenarios of the isomery coalescing network system in the one embodiment of the invention.As shown in Figure 1, wherein, aGW is that heterogeneous access networks closes.It is the network entity of access base station being implemented the network control management that heterogeneous access networks closes.ABS is an access base station.Access base station is to carry out certain consensus standard (as LTE, 3G, WLAN, UMTS or WiMAX, wherein 3G comprises WCDMA, CDMA2000, TD-SCDMA etc.), radio resource management entity, the user who is responsible in this sub-district provides access.And the network state parameter of the resource behaviour in service in this sub-district of real-time collecting and this base station.The form that the network state parameter that regularly forms is packaged into signaling sends to gateway access system.ABS1, aBS2, aBS3, aBS4, aBS5 represent to adopt the isomery access base station of different access technologies (promptly carrying out different consensus standards) respectively, and aGW is connected with aBS1, aBS2, aBS3, aBS4 and aBS5 respectively.Also comprise multi-module mobile terminal (terminal is not shown in Fig. 1) in the isomery coalescing network system, can insert corresponding isomery access base station.
Present embodiment is a kind of network selecting method based on above-mentioned isomery coalescing network system.The main task of network selecting is exactly to select appropriate access network for the operating Business Stream that needs to switch on each terminal.Different with traditional network selecting method, the network selecting method of present embodiment be not merely by terminal according to the decision of its demand and network state of living in thereof, realize network selecting but carry out centralized and unified decision-making based on Business Stream by IAD.So both taken into account professional demand, and can guarantee again under the isomerization access network environment, to make that Internet resources obtained to use to greatest extent.Avoided the drawback brought by each each self-decision of terminal.
Fig. 3 shows the overall procedure of the selecting method for isomeric wireless network of present embodiment, and present embodiment comprises step S1 to S4 as shown in Figure 3, and is specific as follows:
Step S1: each access base station regularly closes the transmission bandwidth of reporting that self current network state information, described network state information comprise access base station at least to be provided to heterogeneous access networks.Network state information can also comprise message transmission rate, safe class and the rate grade that access base station provides.The network state information of bringing in constant renewal in is that heterogeneous access networks closes one of foundation of implementing network selecting.Wherein, transmission rate is meant under certain bandwidth, the data bulk that can send.The relation of transmission rate and bandwidth is determined by shannon formula and Nyquist's theorem.
On specific implementation, access base station can close transmission network state information report signaling to heterogeneous access networks by the predefined cycle.Fig. 2 shows a kind of form of network state information report signaling.
Each field implication shown in Fig. 2 is:
NET_TYPE: the expression network type, 0～7 is selective, such as: 0 is WLAN, and 1 is WiMAX, and 2 is UMTS, and 3 is LTE, and 4～7 keep;
The NET_ID:32 position, the access base station that is illustrated in same kind under the IAD is numbered;
SN: totally 12, the expression package number;
R: for whether the flag bit of transmission bandwidth information is provided, transmission bandwidth information is not carried in 0 expression, and transmission bandwidth information is carried in 1 expression;
WR: totally 8, the expression transmission bandwidth that access base station provided;
D: for whether the flag bit of message transmission rate information is provided, message transmission rate information is not carried in 0 expression, and message transmission rate information is carried in 1 expression;
DR: totally 8, the available message transmission rate of expression access base station;
C: for whether the flag bit of tariff information is provided, tariff information is not carried in 0 expression, and tariff information is carried in 1 expression;
CO: totally 8, represent the rate situation of this network type; This rate situation can be the rate grade that quantizes;
S: for whether providing the flag bit of safety level information, 0 expression class information not safe to carry, 1 expression class information safe to carry;
SEC: totally 3, provide 0～7 safety level information.
Step S2: heterogeneous access networks closes the business attribute information of obtaining all types of Business Streams, and described business attribute information comprises the transmission bandwidth that Business Stream is required at least.Described business attribute information can also comprise the needed message transmission rate of Business Stream, safe class and rate grade.In general the project that is comprised in the business attribute information is corresponding one by one with network state information among the step S1.Heterogeneous access networks closes and can adopt multiple mode to obtain business attribute information, as: take to hold back method, promptly connect when setting up, set up from connection and obtain business attribute information the parameter in business; Or take the request method, promptly by business attribute information to core network server request type.
Step S3: heterogeneous access networks closes the Business Stream that regularly request is switched and carries out batch processing, for each Business Stream that current request is switched is selected access network.
A scheme that realizes this step is described below.
Business Stream be a terminal with other network entity between carrying being connected of certain business.Business Stream is the base unit of the network selecting of present embodiment.In heterogeneous network system, may move a plurality of Business Streams simultaneously on the terminal, and these Business Streams may be its service by different isomery access base stations respectively.Therefore, when switching access base station, present embodiment also is to be basic switching unit with each Business Stream.When the service quality of a certain Business Stream on the terminal was unstable, this Business Stream just needed to switch to enter new access network.In the present embodiment, the handoff request of each Business Stream of each terminal all can report heterogeneous access networks by access base station and close.Heterogeneous access networks closes the Business Stream that then regularly current all requests is switched and carries out batch processing, for each Business Stream that current request is switched is selected access network.
The batch process of this step comprises:
S31: travel through the Business Stream that each request is switched;
S32:, draw the matching degree of the network state information of the business attribute information of this Business Stream and each access base station to each current business flow;
S33: select the access base station of optimal matching degree will switch the target access base station that enters as current business flow.
Wherein, matching degree is the weighted average of the absolute value of the absolute value of absolute value, safe class difference of absolute value, the message transmission rate difference of the transmission bandwidth difference of network state information and business attribute information and rate grade difference.In some simple embodiment, back three weights can be 0.Promptly when calculating matching degree, only consider the matching degree of transmission bandwidth.
S4: check that described heterogeneous access networks closes each access base station of being administered and whether transships,, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, make described overload access base station transfer nonoverload to the overload access base station.
This step is on the basis of step S3, wherein, Fig. 4 shows a kind of flow process that selection is optimized further to heterogeneous network, in a preferred version, step S4 comprises that following substep (need to prove, these steps only are preferred versions, and they are not to realize unique channel of the present invention):
S41: calculate the overload quantity that heterogeneous access networks closes each access base station of being administered; In the present embodiment, the overload quantity of an access base station is the amount that the shared total bandwidth of the present Business Stream that distributes of this access base station exceeds the bandwidth that this access base station can provide, and overload quantity can be negative value.
S42: travel through each access base station successively by overload quantity order from large to small;
S43: current access base station is transshipped adjustment, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, make described current access base station transfer nonoverload to.And select the access base station of the access base station of described matching degree suboptimum after order comes current access base station, can prevent that so trained access base station from transshipping once more.
On specific implementation, this step need be selected those from the current business flow of current access base station will be adjusted to Business Stream in the suboptimum network.In the present embodiment, can take traffic stream service quality principle of priority.Particularly, with reference to Fig. 5, step S43 can realize by following substep.
Step 431: find out the Business Stream of matching degree difference minimum in the current access base station and it be adjusted to the access base station of matching degree suboptimum, described matching degree difference be this Business Stream the difference of obtainable Optimum Matching degree and suboptimum matching degree.This way can reduce as much as possible and is adjusted the service quality loss of Business Stream because of selecting the suboptimum network to produce.
In addition, transship once more, overload can be set for trained access base station adjust sign in order to prevent trained access base station.When the access base station of the matching degree suboptimum of the Business Stream of matching degree difference minimum has overload and adjusts sign, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum.At this moment, need in current access base station surplus lines stream, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum.
Step 432: judge whether still overload of current access base station,, then re-execute step 431 if still transship; If nonoverload then adds overload and adjusts sign, the overload adjustment of current access base station finishes.
Further, in the described step 431, when having the Business Stream of two or more matching degree difference minimums simultaneously, preferentially adjust the wherein bigger Business Stream of occupied bandwidth.Can reduce the number that is adjusted Business Stream so as far as possible, and then reduce affected number of users.
Further, in the described step 431, can also set the adjustment threshold value respectively for dissimilar Business Streams in advance, when the matching degree difference of a Business Stream surpasses the adjustment threshold value of this Business Stream, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum.At this moment, need in the surplus lines stream of current access base station, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum.This way can reduce or avoid transshipping and adjust influence to some important relatively traffic stream service quality.
S44: for last access base station, if this access base station overload then adds the partial service stream that it carried and blocks formation, so that this access base station transfers nonoverload to.The Business Stream that blocks in the formation will not carried out the network switching.
Further, execution in step 45 after the substep 44 that can also be in step 4: to block Business Stream in the formation by shared bandwidth by little to big ordering, adjust each Business Stream that blocks in the formation then successively.Comprise following substep with reference to Fig. 6 adjustment process: step 451 is checked the remaining bandwidth of current each access base station, if exist remaining bandwidth greater than the access base station that blocks the shared bandwidth of first Business Stream in the formation, then described first Business Stream be adjusted to this access base station; Otherwise finish blocking the adjustment of formation; Step 452 shifts out the obstruction formation with first Business Stream, re-executes step 451.Can reduce obstruction so as much as possible to the Business Stream number in the row.
Embodiment 2
Embodiment 2 and embodiment 1 basically identical, the difference part is step 431.The difference of the step 431 among the step S431 of present embodiment and the embodiment 1 is: in the overload adjustment process, whether also need to judge has the access base station of the matching degree suboptimum that the Business Stream adjustment enters to transship, if overload, then the described Business Stream that adjustment is entered directly changes the obstruction formation over to.This way can farthest be kept the result of first selection, can guarantee the network of plurality purpose Business Stream selection optimal matching degree.And, in the present embodiment, when the traversal access base station,, therefore can directly stop the ergodic process of step 42 this moment if current access base station nonoverload then can be concluded the equal nonoverload of access base station after ordering is leaned on.
Other step of present embodiment is consistent with embodiment 1, repeats no more.
What deserves to be explained is that network selecting of the present invention is the pre-treatment step before reality is carried out the network switching, it can reduce the blocking rate in the real network handoff procedure under the prerequisite that guarantees service quality, can improve network resource utilization.And, among the present invention, no matter be that the shared resource of first selection or the adjustment of follow-up overload is all very little.
Above said content; only for the concrete execution mode of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed in protection scope of the present invention.
Claims (10)
1. selecting method for isomeric wireless network, this method is used for the isomery coalescing network system, described isomery coalescing network system comprises that the access base station of isomery and heterogeneous access networks close, described heterogeneous access networks closes and is used for the access base station of a plurality of isomeries is implemented the network control management, and described selecting method for isomeric wireless network comprises the following steps:
1) Business Stream that each request is switched, heterogeneous access networks close the matching degree of the network state information of the business attribute information that draws this Business Stream and each access base station;
2) select the access base station of optimal matching degree will switch the target access base station that enters as current business flow.
2. selecting method for isomeric wireless network according to claim 1 is characterized in that, described selecting method for isomeric wireless network also comprises: each access base station regularly closes the current network state information of report self to described heterogeneous access networks; Described network state information comprises the transmission bandwidth that access base station provides; Described business attribute information comprises the transmission bandwidth that Business Stream is required.
3. selecting method for isomeric wireless network according to claim 2, it is characterized in that, message transmission rate, safe class and rate grade that described network state information also comprises access base station and provided, described business attribute information also comprises the needed message transmission rate of Business Stream, safe class and rate grade, and described matching degree is the weighted average of the absolute value of the absolute value of absolute value, safe class difference of absolute value, the message transmission rate difference of the transmission bandwidth difference of network state information and business attribute information and rate grade difference.
4. selecting method for isomeric wireless network according to claim 1, it is characterized in that, heterogeneous access networks closes the Business Stream that request is switched and carries out batch processing, described selecting method for isomeric wireless network also comprises: step 3) checks that described heterogeneous access networks closes each access base station of being administered and whether transships, to the overload access base station, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, makes described overload access base station transfer nonoverload to.
5. selecting method for isomeric wireless network according to claim 4 is characterized in that, described step 3) comprises following substep:
31) calculate the overload quantity that described heterogeneous access networks closes each access base station of being administered;
32) travel through each access base station successively by overload quantity order from large to small;
33) current access base station is transshipped adjustment, the partial service stream that this access base station carried is adjusted to the access base station of matching degree suboptimum, make described current access base station transfer nonoverload to, the access base station of described matching degree suboptimum is selected from order comes access base station after current access base station;
34) for last access base station, if this access base station overload then adds the partial service stream that it carried and blocks formation, so that this access base station transfers nonoverload to.
6. selecting method for isomeric wireless network according to claim 5 is characterized in that, described step 33) comprise following substep:
331) find out the Business Stream of matching degree difference minimum in the current access base station and it is adjusted to the access base station of matching degree suboptimum, described matching degree difference be this Business Stream the difference of obtainable Optimum Matching degree and suboptimum matching degree; When the access base station of the matching degree suboptimum of the Business Stream of matching degree difference minimum has overload and adjusts sign, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum; At this moment, in the surplus lines stream of current access base station, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum;
332) judge whether still overload of current access base station,, then re-execute step 331) if still transship; If nonoverload then adds overload and adjusts sign, the overload adjustment of current access base station finishes.
7. selecting method for isomeric wireless network according to claim 6, it is characterized in that, described step 331) in, comprise that also in advance the Business Stream of each type being set Business Stream respectively adjusts threshold value, when the matching degree difference of a Business Stream surpasses the Business Stream adjustment threshold value of this Business Stream, forbid this Business Stream is adjusted to the access base station of matching degree suboptimum; At this moment, in the surplus lines stream of current access base station, search the Business Stream of matching degree difference minimum again and it is adjusted to the access base station of matching degree suboptimum.
8. selecting method for isomeric wireless network according to claim 6, it is characterized in that, described step 331) in, when existing two or more matching degree differences to equate simultaneously and during the Business Stream of matching degree difference minimum, preferentially adjusting the wherein bigger Business Stream of occupied bandwidth.
9. according to any described selecting method for isomeric wireless network in the claim 5 to 8, it is characterized in that, described step 3) also comprises step 35), the Business Stream that blocks in the formation is sorted to big by little by shared bandwidth, adjust each Business Stream that blocks in the formation then successively, adjustment process comprises the following steps: 351) check the remaining bandwidth of current each access base station, if exist remaining bandwidth greater than the access base station that blocks the shared bandwidth of first Business Stream in the formation, then described first Business Stream be adjusted to this access base station; Otherwise finish blocking the adjustment of formation; 352) first Business Stream is shifted out the obstruction formation, re-execute step 351).
10. selecting method for isomeric wireless network according to claim 5, it is characterized in that described step 33) in, whether judge has the access base station of the matching degree suboptimum that the Business Stream adjustment enters to transship, if overload, the described Business Stream that adjustment is entered changes the obstruction formation over to; And, if current access base station nonoverload then stops step 32) ergodic process.
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