CN101516115A - Method for carrying out adaptive optimization switching on group services based on demand prediction and priority - Google Patents
Method for carrying out adaptive optimization switching on group services based on demand prediction and priority Download PDFInfo
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Abstract
The invention relates to a method for carrying out adaptive optimization switching on group services based on demand prediction and priority and belongs to the technical field of broad band wireless communication. The method can be applied to that various heterogeneous networks can synchronously exist in the same space, and a mobile terminal has multi-module functions and can run different services synchronously. The method comprises: positioning a switching object onto the services, setting two kinds of preswitching demand threshold, calling relative weight matrixes in an analytic hierarchy process weight matrix database according to the factors, such as service quality, terminals, service types, terminal modes, switching requirements and the like, and comparing the matrixes after multiplication and addition to acquire priority queue of the services to be preswitched. The preswitched services are divided into groups according to priority dynamic state at the same time, the analytic hierarchy process weight matrix is used, and the adaptive optimization switching is selected by considering network internal influence factors, service priority, network selectable priority and the like. The switching result has a feedback function for the network selectable weight used for the next switching selection, and the method improves the switching efficiency and network gain.
Description
Technical field
The invention belongs to the broadband wireless communications field, relate to a kind of handoff technique, especially, can be widely used in the following wireless communication field based on the group service adaptive optimization changing method of requirement forecasting and priority.
Background technology
The direction of following wireless mobile communications development will be that multiple wireless access technology and standard are interconnected analyses complementation mutually, for the user provides ubiquitous information communication service ubiquitous, at all times.The next generation mobile communication topology of networks will be progressively evolution become at many levels, the cubic network structure of eclipsed form.Have dissimilar access networks in the same space simultaneously, they have separately characteristics and suitable application scenario.When the user adopts different access technologies, will be taken as single client and handle, allow the user to cross over the existing network border and go to use and manage their business.The user has the ability to change access point or terminal; The user can use various access technologies and be linked into network from any Network Access Point.In inserting handoff procedure, can keep the continuity and the corresponding QoS that serve to guarantee.
It is important problem very in the wireless mobile communications that network switches always, also is the problem of a difficult thorough solution.And the adding of the factors such as immeasurability of the diversity of the multimode of the otherness of the heterogeneous networks that exists on the same space, user's preference, terminal, business demand and environment, handoff procedure in the consolidated network, the complexity of problem increases greatly.Ripe relatively before horizontal handoff algorithms is inapplicable.And being conceived to the research of service environment self adaptation aspect in the heterogeneous network, difficulty is very big especially.And the present invention is based on requirement forecasting and service priority, carrying out the optimization of group service environment self-adaption switches, a well adaptive common technique of service environment in heterogeneous network environment is provided, satisfy the adaptive requirement of service environment, improve the customer service quality, increase switching efficiency, optimize network and equally loaded.
Summary of the invention
The object of the present invention is to provide a kind of group service adaptive optimization changing method based on requirement forecasting and priority, the large-scale public place that pooled applications stream of people in the city is various, as waiting room, library, hypermarket etc., satisfy the adaptive requirement of service environment, improve the customer service quality, increase switching efficiency, balanced load.
For reaching above purpose, solution of the present invention is:
A kind of group service adaptive optimization changing method based on requirement forecasting and priority, it may further comprise the steps: M business is the pre-switch business before in the selected service priority formation; The network that calculates the professional functional value maximum of M pre-switch is as pre-switch purpose network; Verify the primary demand that each is professional, the business that does not obviously meet pre-switch purpose network is with disallowable; Connecting link switches.
Further, described service priority formation is arranged from high to low according to the priority of business, and service priority utilizes analytic hierarchy process (AHP) weight matrix database to calculate definite to the business of pre-switch demand service lists and arranges.
Described pre-switch demand service lists is determined according to the quality of service composite index, when the quality of service composite index arrives the pre-switch threshold value for the first time, thresholding reaches number of times and is designated as 1, when reaching once more, increase by 1, when thresholding reaches number of times and reaches certain value, then business is added pre-switch demand service lists; Business is low and very low according to quality of service to be divided into demand 1 and demand 2, and the threshold value of setting demand 2 is lower than demand 1.
M the pre-switch business that described priority is the highest, call the weight matrix database behind the analytic hierarchy process (AHP), the percentage of substitution current network factor of influence and professional primary demand, eliminate each network factors because that dimension differs and occurs is inconsistent, get M pre-switch service integration the best, selected pre-switch purpose network.
The described business that does not obviously meet to be switched purpose network is added to the head of the queue of pre-switch demand service priority formation, waits for switching next time.
Described link connects, from selected timing when switching the purpose network, select to be determined to through the pre-switch of 0.5 setting and switch the time of carrying out timer and just carry out link and connect, to the timer time set switch execution; Terminal, base station or access point initiatively initiate to switch, and then switch not to be subjected to pre-switch to select to be determined to the time restriction of switching the execution timer, switch but directly set up link and carry out.
After described switching runs succeeded, the selecteed weight of access network reduces K% when pre-switch is next time selected, and the selecteed weight rising of primitive network K%, when network is access in cumulative number and reaches network and add the access number of times thresholding of banned list, this network can be added into forbids that access list does not participate in the network selecting in the certain hour, after needing to be added into the time of restore cycle after the banned list through network, this network withdraws from banned list automatically, participates in network selecting once more.
Comprised pre-switch demand judgement in the described weight matrix database, used weight matrix when selecting judgement is determined, switched to the pre-switch service priority.Specifically, the weight matrix database storage the miscellaneous service of using in above-mentioned three judging process influences the factor of judgement in particular network weight matrix.For example, business is being carried out in the judging process of pre-switch priority, store service delay, bandwidth, user priority grade, professional priority level, packet loss, mode prioritization grade in the database, switching the isoparametric weight of demand priority grade, be used for judgement.
The invention provides a kind of group service adaptive optimization changing method, specifically comprise the steps: based on requirement forecasting and priority
The switch reasons that the present invention considers is except mobility, and the more concern point is professional individual ruuning situation.On the whole the object that switchover policy is before considered is portable terminal itself, and switching when carrying out also is the whole switching of terminal.And for some handoff scenario, various but static relatively waiting room and the library of the stream of people for example, the geographical position is not a most important reason in the switching demand, the adaptability that adds miscellaneous service on the terminal is different again, change the business on the terminal into so consider object, the main body of the business of moving on the terminal as switching.So both meet the requirement of service adaptation on the terminal, also met the overall interests that network switches.
For a long time, pre-switch mode is considered to guarantee well switching demand and switching efficiency.Particularly in heterogeneous network switched, the multimode feature of terminal provided excellent platform for the pre-switch mode.Terminal is had the ability fully to have in continuous Kaiyuan and is ready to target on the connection basis and connects.When the present invention introduces the pre-switch mode, consider the adaptive demand of service environment, the pre-switch demand be classified as two classes, optimize and switch, can produce a desired effect as far as possible in the hope of quality of service:
A, quality of service lower (demand 1);
B, quality of service are very low, so that interruption (demand 2);
When judging whether the operation business reaches pre-switch demand thresholding, main by the information interaction between UE (terminal) and BS (base station), the AP (access point), use simple QoS (service quality) and other network characteristics, call analytic hierarchy process (AHP) weight matrix database afterwards, be weighted integration, adjudicate, add pre-switch demand traffic table to, and record corresponding network feature, for subsequent treatment, for example type of service, professional primary demand, terminal number, service network, quality of service, switching demand or the like.When judging, add timer, just add pre-switch demand traffic table when reaching the corresponding number of times of thresholding, avoid the generation of " ping-pong ".
Pre-switch demand business is being switched in the process of selection, preceding M the business that choice of dynamical priority of the present invention is higher, carrying out group switches, select a suitable networks, increase switching efficiency, so before switching selection, priority orders how to judge the demand business is an important problem.And the network task switching what big or small the determining of M value depend on, and dynamically adjusts.
The evaluation of pre-switch demand service priority directly has influence on the running quality and the whole networks efficiency of demand business.With reference to User Priority, service priority, environment priority, mode prioritization level etc., utilize analytic hierarchy process (AHP) weight matrix database, determine the formation of pre-switch service priority, pre-switch demand traffic table is arranged from high to low according to priority.
Choose the highest M of priority and treat the pre-switch business, consider professional weight, the optional weight of network, network factors weight etc., call the weight matrix database behind the analytic hierarchy process (AHP), the percentage of substitution current network factor of influence and professional primary demand, eliminate each network factors because that dimension differs and occurs is inconsistent, get M pre-switch service integration the best, select the purpose network of this professional switch groups.Because it is whole best that the network of selecting is a switch groups, but be not single professional local optimum, behind preliminary selected switching purpose network, the professional primary demand of reply is verified, avoids manifest error to switch and selects.The business that does not obviously meet to be switched purpose network is added to the head of the queue of pre-switch demand service priority formation.
Owing to be the pre-switch mode, execute switch select after, link is not necessarily to reach the switching requirement, if force this moment to switch, for whole network, will lose corresponding network and use gain.So at each to be switched business, timing when switching the purpose network from selecting is just carried out link through 0.5 switching timer time and is connected, and has arrived the switching timer time, then switches execution; Can greatly utilize network to use gain like this, increase network utilization, and quality of service can be not influenced.But, be not subjected to the switching timer restriction just directly to set up link and carry out and switch if UE and BS, AP initiatively initiate to switch.
The accuracy of switch selecting depends on the accurately and timely assurance to live network situation and each service feature, knows after artificial and obtains certain time-delay, lacks initiative.And network self is optimized and revised it and is only our desired destination.Use the result of switching after being finished to upgrade pre-switch priority query and the optional weight matrix of network, this step is extremely important.For example for the adjustment of the optional weight matrix of network, for the successful corresponding minimizing of the optional weight/increase certain percentage of access/disconnection network, can very clearly characterize the network congestion degree, make the follow-up pre-switch demand business ability that aware networks can insert when selecting, be of value to equalizing network, improve switching efficiency and professional gain.
Comprised pre-switch demand judgement in the analytic hierarchy process (AHP) weight matrix database, used weight matrix when selecting judgement is determined, switched to the pre-switch service priority.Only need call the corresponding weights matrix when carrying out these judgements, weighting is taken advantage of to add and can be obtained required result.The foundation of these weight matrix depends on the accurate assurance of correlation between criterion, target and the criterion of step analysis.For example target is a pre-switch service priority index, criterion is User Priority, service priority, environment priority, mode prioritization level, determine significance level correlation in twos between the criterion, use analytic hierarchy process (AHP) just can obtain User Priority, service priority, environment priority, mode prioritization level weight matrix for pre-switch service priority index.The reasonability of weight matrix has been guaranteed in consistency check in the analytic hierarchy process (AHP).For example, ftp business is being carried out in the judging process of pre-switch priority, storing time delay, bandwidth, user priority grade, professional priority level, packet loss, terminal pattern priority level, the isoparametric weight of demand priority grade of switching of ftp business in the database.In when judgement, adopt the functional value after adding of taking advantage of of each network actual value and weight to compare, and then determine that professional pre-switch according to priority arrangement is to being listed as.
Owing to adopted such scheme, the present invention to have following characteristics: under the switching conditions of demand that heterogeneous network multimode terminal operation multiple business produces, switch object and be positioned business itself, the business that makes has more initiative, can reach the requirement of adaptive environment.Choose the pre-switch mode, improve switching efficiency, be easy to meet the demand of service switchover, accomplish the high-quality seamless switching.Introduce the formation of pre-switch demand service priority, according to the network task switching what, Dynamic Packet is switched, and can raise the efficiency greatly, increases handoff gain.The successful switch result upgrades for the optimization of switching criterion, again can be so that the whole network equilibrium increases network utilization.Set up analytic hierarchy process (AHP) weight matrix database, both guaranteed judgements such as pre-switch thresholding, pre-switch service priority, switching selection more accurately rationally, can significantly reduce computation complexity again.
Description of drawings
Fig. 1 is the professional decision flowchart of pre-switch demand of the present invention.
Fig. 2 is that flow chart is determined in pre-switch demand service priority of the present invention formation.
Fig. 3 is that pre-switch of the present invention inserts the selection course flow chart.
Fig. 4 is that flowchart is switched in the present invention.
Fig. 5 is a flow chart of the present invention.
Fig. 6 is an embodiment of the invention flow chart.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawing illustrated embodiment.
The suitable scene that the present invention considers is at the various large-scale public place of the stream of people, as waiting room, library, hypermarket etc.The heterogeneous network type of considering is unrestricted, chooses Bluetooth here, and 802.11 and 802.16 are illustrated as example, and promptly the multimode ability of terminal has above three kinds of access waies, and the type of service of considering also is varied.
Consider a typical heterogeneous network handoff scenario, intersect on the same space position and exist Bluetooth, 802.11 and the access point of 802.16 3 kind of technology, and with a kind of access point of network also more than one.In order to make 3 kinds of isomery access technologies can get around regulations work, added 802.21 switching servers and coordinated to plan as a whole switch decision.Analytic hierarchy process (AHP) weight matrix database also is based upon on 802.21 switching servers.Terminal has the multimode ability, and the business on the terminal also is varied, has different network-adaptives.
The characteristics of service adaptation of the present invention show that the operation business can monitor the running quality rank, adjust automatically and switch, and always towards measured network insertion to the greatest extent, thereby reach the adaptive effect of service environment.Here the object that switches is transferred to the business on the terminal, used traditional whole switching of terminal of professional switching replacement, make business have more initiative.
The service operation quality uses an overall target to come quantitatively, mainly be by selecting the related service quality influence factor, terminal and 16BS, 11AP, Bluetooth AP interactive information, obtain the real-time parameter of quality of service factor of influence, call analytic hierarchy process (AHP) weight matrix database, calculate the quality of service overall target.When judging whether the quality of service overall target reaches the pre-switch state, be provided with two kinds of pre-switch thresholdings:
A, quality of service lower (demand 1);
B, quality of service are very low, so that interruption (demand 2);
It is in order to allow the operation business obtain quality of service preferably that two kinds of thresholdings are set.In order to prevent the generation of " ping-pong ", influence the network switching efficiency, when judging, added timer.Quality of service composite index (QR) is reaching pre-switch threshold value (demand 1:QRL for the first time; Demand 2:QRP) time, thresholding reaches number of times (demand 1:QL; Demand 2:QP) is designated as 1, through a timer time (demand 1:T_QL; Demand 2:T_QP) after, when reaching once more, then increase by 1, thresholding reaches number of times and reaches certain value (demand 1:QLvalue; Demand 2:QPvalue) time, then business is added into pre-switch demand traffic table, waits for the pre-switch selection.Demand 2 is lower than the pre-switch threshold value of demand 1, so demand 2 needs the priority of switching higher relatively than demand 1.
Table 1
| Type of service | Terminal number | Service network identification | Network type | The switching demand | User Priority | Service priority | Environment priority | The mode prioritization level |
The form such as the table 1 of pre-switch demand traffic table are being put down in writing the professional type of operation, terminal, serving BS broadcasts (AP), multimode mode, quality of service or the like, for determining of subsequent need service priority formation.Determining of pre-switch demand service priority mainly is by considering priority characteristic in many ways, calls the weight matrix database after the equivalent layer fractional analysis, and substitution is taken advantage of and added comparison and get.The evaluation of pre-switch demand service priority directly has influence on the running quality and the whole networks efficiency of demand business.With reference to User Priority, service priority, environment priority, mode prioritization level, pre-switch demand levels etc., utilize analytic hierarchy process (AHP) weight matrix database, calculate and relatively more definite pre-switch service priority formation, pre-switch demand traffic table is arranged from high to low according to priority.Here the priority parameters of Kao Lving is described as follows:
User Priority: the priority level between the terminal;
Service priority: the priority level between the type of service, for example: real-time business is than non real-time height;
Current business quality priority: current business credit rating;
Terminal pattern priority: single mode, bimodulus, multimode operation etc., mode of operation is many, and priority level is higher;
Pre-switch demand priority level: between demand 1 and the demand 2, demand 2 priority are higher.
In group's pre-switch selection course, according to the pre-switch task what, treat the professional pre-switch service groups of forming of pre-switch for M that choice of dynamical priority is the highest, particularity at every kind of business and each optional network specific digit, consider professional weight, the optional weight of network, network factors weight etc., call the respective weights matrix database behind the analytic hierarchy process (AHP), the percentage of substitution current network factor of influence and professional primary demand is eliminated each network factors because that dimension differs and occurs is inconsistent.Calculate that network of the professional functional value maximum of M pre-switch, be the purpose network of this professional switch groups.The determining of value M size determines that by the busy extent of network at that time if network pre-switch task is more, M is corresponding bigger; If network pre-switch task is less, then M is corresponding less.
Professional weight matrix refers to the significance level between the business; The network factors weight refers to the weight between the factor that influences the service access decision of certain business in certain network; The network weight matrix refers to the possibility of selecting a certain network, for example, inserts too much before 802.11 networks, and 802.16 networks are fewer, for equilibrium, insert 802.11 priority ratio insert 802.16 low, load that so just can two networks of equilibrium.Switching the result who runs succeeded selects decision to carry out self-optimizing to the back primary network.Every handover success once, the selecteed weight of access network reduced K% when pre-switch was next time selected, and the selecteed weight rising of primitive network K%.By the time totally be access in network number of times ANi and reach adding banned list threshold value ANivalue, can be added into and forbid access list, this network does not participate in the network selecting in the certain hour.Promptly pass through the Ritime time, withdraw from banned list automatically, participate in network selecting once more.
Because it is whole best that the network of selecting is a switch groups, but be not single professional local optimum, behind preliminary selected switching purpose network, tackle each professional primary demand and verified, avoid manifest error to switch and select.The business that does not obviously meet to be switched purpose network is added to the head of the queue of pre-switch demand service priority formation.
Advantage for the mode of performance pre-switch greatly increases handoff gain, determine the professional pre-switch business objective of demand network after, directly do not carry out link and connect, but added a switching timer (demand 1:WLivalue; Demand 2:WLivalue), wait timing parameter (demand 1:WLi; Demand 2:WPi) just carries out link through 0.5 switching timer time and connect, waited until the switching timer time, then switch and carry out; But if terminal or BS, AP etc. initiatively initiate the switching demand, then directly carry out link and connect and hand-off execution process, not limited by timer.
Comprise pre-switch thresholding, pre-switch service priority in the analytic hierarchy process (AHP) weight matrix database, switched used weight matrix when judgement such as selecting.Only need call the corresponding weights matrix when carrying out these judgements, weighting is taken advantage of to add and can be obtained required result.The foundation of these weight matrix depends on the accurate assurance of correlation between criterion, target and the criterion of step analysis.For example target is a pre-switch service priority index, criterion is User Priority, service priority, environment priority, mode prioritization level, determine significance level correlation in twos between the criterion, use analytic hierarchy process (AHP) just can obtain User Priority, service priority, environment priority, mode prioritization level weight matrix for pre-switch service priority index.The reasonability of weight matrix has been guaranteed in consistency check in the analytic hierarchy process (AHP).
What describe in the accompanying drawing 5 is an example of the present invention.Two multi-module mobile terminal A, B, the business of terminal A inserts 802.16 at the beginning, terminal B service access Bluetooth at the beginning, in monitoring quality of service process, A, the weight matrix of B switching demand judgement, whether computing service reaches the pre-switch demand.Calculate and confirm that A, B have business not meet operation quality requirement, reach the pre-switch demand thresholding that sets.Professional as main body, initiate the pre-switch process, send the pre-switch request to 802.21 switching servers.After receiving request, 802.21 switching servers calculate the switching priority of determining the pre-switch business, carry out Dynamic Packet according to the service switchover number then, initiate handover measurement procedure.After receiving measurement report, call to switch and select weight matrix that the business that needs on A, the B to switch is carried out group's switching selection.Afterwards, carry out hand-off execution process again, upgrade corresponding weights matrix on 802.21 servers after the successful execution again.After switching selection,, be not in same network, to move so switch selection back terminal traffic because the switching main body is the operation business.Process is as Fig. 5 detailed process, and final terminal A partial service is linked into 802.11, and terminal B partial service also is linked into 802.11, makes A, B all enter the multimode operation mode, reaches to guarantee that quality of service and network use balanced purpose.Information updating after network successfully inserts has been optimized next switching again and has been selected.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (8)
1, a kind of group service adaptive optimization changing method based on requirement forecasting and priority, it is characterized in that: it may further comprise the steps: M business is the pre-switch business before in the selected service priority formation; The network that calculates the professional functional value maximum of M pre-switch is as pre-switch purpose network; Verify the primary demand that each is professional, the business that does not obviously meet pre-switch purpose network is rejected; Connecting link switches.
2, the group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 1, it is characterized in that: described service priority formation is arranged from high to low according to the priority of business, and service priority utilizes analytic hierarchy process (AHP) weight matrix database to calculate definite to the business of pre-switch demand service lists and arranges.
3, the group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 2, it is characterized in that: described pre-switch demand service lists is determined according to the quality of service composite index, when the quality of service composite index arrives the pre-switch threshold value for the first time, thresholding reaches number of times and is designated as 1, when reaching once more, increase by 1, when thresholding reaches number of times and reaches certain value, the pre-switch demand service lists of then being engaged in being added into; Business is low and very low according to quality of service to be divided into demand 1 and demand 2, and the threshold value of setting demand 2 is lower than demand 1.
4, the group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 1, it is characterized in that: M the pre-switch business that described priority is the highest, call the weight matrix database behind the analytic hierarchy process (AHP), the percentage of substitution current network factor of influence and professional primary demand, eliminate each network factors because that dimension differs and occurs is inconsistent, get M pre-switch service integration the best, selected pre-switch purpose network.
5, the group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 1, it is characterized in that: the described business that does not obviously meet to be switched purpose network is added to the head of the queue of pre-switch demand service priority formation, waits for switching next time.
6, the group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 1, it is characterized in that: described link connects, timing when switching the purpose network from selecting, select to be determined to through the pre-switch of 0.5 setting and switch the time of carrying out timer and just carry out link and connect, to the timer time set switch execution; Terminal, base station or access point initiatively initiate to switch, and then switch not to be subjected to pre-switch to select to be determined to the time restriction of switching the execution timer, switch but directly set up link and carry out.
7, group service adaptive optimization changing method based on requirement forecasting and priority as claimed in claim 1, it is characterized in that: after described switching runs succeeded, the selecteed weight of access network reduces K% when pre-switch is next time selected, and the selecteed weight rising of primitive network K%, when network is access in cumulative number and reaches network and add the access number of times thresholding of banned list, this network can be added into forbids that access list does not participate in the network selecting in the certain hour, after needing to be added into the time of restore cycle after the banned list through network, this network withdraws from banned list automatically, participates in network selecting once more.
8, as claim 2 or 4 described group service adaptive optimization changing methods, it is characterized in that: comprised pre-switch demand judgement in the described weight matrix database, used weight matrix when selecting judgement is determined, switched to the pre-switch service priority based on requirement forecasting and priority.
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