CN1691617A - Method of flow control in communication system - Google Patents
Method of flow control in communication system Download PDFInfo
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- CN1691617A CN1691617A CN 200410037030 CN200410037030A CN1691617A CN 1691617 A CN1691617 A CN 1691617A CN 200410037030 CN200410037030 CN 200410037030 CN 200410037030 A CN200410037030 A CN 200410037030A CN 1691617 A CN1691617 A CN 1691617A
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Abstract
The invention discloses a method for flow-controlling in the communication system, comprising: setting the business application number that system allowed and the call cutting-in flag of switch-in permission according to system's load arrangement, and starting cycle timer; when business application generates to the entry point of the said communication system, judging if the said call cutting-in flag is marked as allowable; declining the application if it is marked as unallowable; otherwise the application will be switched in, system will calculate the total number of business application that already switched in and compare it with the allowable number, the call cutting-in flag will be marked as unallowable when total number is larger than the allowable one; comparing the actual load with the controlling target on fixed cycle, modifying the allowable business number of switched in and call cutting-in flag just in time, controlling system load in the allowable range.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method of in communication system, carrying out flow control.
Background technology
Flow control (abbreviation Flow Control) technology is a key technology in the communication system.The purpose that adopts flow control is for anti-locking system is unlikely to collapse when receiving a large amount of service access requests, with this ability of coming the opposing malicious attack of raising system, keeps the regular traffic disposal ability of communication equipment to greatest extent.
Present most of communication equipment all adopts the mode of classification Flow Control.The principle of this classification Flow Control is: open Flow Control when the CPU of system occupation rate reaches the startup threshold values, stop Flow Control when the CPU occupation rate drops to the recovery threshold values.To the CPU of system occupy branch good what, the user of restriction different proportion inserts under different stage.Be set to 80%, 85%, 90%, 95% level Four such as starting threshold values, for the big ups and downs that prevent that CPU from occupying, it recovers threshold values accordingly and will be provided with smallerly, can be 75%, 80%, 85%, 90% such as its corresponding recovery threshold values setting.When the service request that the CPU of system occupies the time restriction 25% that reaches one-level, reach the business of secondary Flow Control time limit system 50%, the service request of restriction 75% limits all service request when reaching the level Four Flow Control when reaching three grades of Flow Controls.CPU such as have only to occupy after the system start-up one-level Flow Control to drop to when it recovers threshold values 75% and could cancel Flow Control.
Carrying out the not necessarily CPU occupation rate of system of index that Flow Control judges, also can be certain resource of system, such as message bag resource, and number of queues, bill pool occupies situation etc., but its design principle all is similar.
Though above-mentioned scalable stream prosecutor formula can restriction partly or entirely insert request when producing a large amount of service access requests, can keep the disposal ability of system to a certain extent, has the following disadvantages:
1, owing to be the classification Flow Control, Flow Control judges that the sign scope need be provided with greatlyyer.As carrying out Flow Control by the CPU occupation rate, Flow Control is about to begin when the CPU occupation rate is 80%.Judge the sign scope if dwindle Flow Control, fluid control effect is just not obvious, perhaps causes Flow Control to lose efficacy.
2, when new service request that system is received is just in time in the Flow Control level range, the classification Flow Control will start, cause the partial service request to be rejected, but the actual treatment ability of system can be handled all these service request fully at this moment, causes system processing power not to be fully utilized.
3, when the service request that increases newly just in time makes system be in two rank intersections, inevitably can cause the fluctuation of system loading, two ranks of maximum fluctuation amplitude for being provided with.
4, for fear of the big ups and downs of system, judge Flow Control whether the index of Flow Control all to pass through smoothing processing, the mark of the mean value of getting former second flow controls Flow Control, the time-delay with regard to unavoidably causing judging like this as whether.When the service request that increases newly was several times of design capacity, system inevitably can reach more than 95% even 100%.Such as the service request that increases newly is 5 times of design, reaches also to also have after three grades of Flow Controls 5 * 25%=1.25 service request doubly to be access in processing, because the time delay of judging will cause the load of system to continue to rise, so just may cause system crash.
If 5 judge whether that the mark of Flow Control does not carry out smoothing processing, when producing of short duration burst service amount, system also can carry out Flow Control, but in fact this of short duration burst service amount system can normal process.
6, in order to reach the purpose of accuracy-control system load, though can segment the Flow Control rank, as be divided into 10 grades or 20 grades, just having increased the complexity of system like this, aforesaid shortcoming can not be avoided fully simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of method of in communication system, carrying out flow control, to solve the problem that has system fluctuation in the existing fluidics and can not make full use of system processing power.
For addressing the above problem, the invention provides following technical scheme:
A kind of method of carrying out flow control in communication system, described communication system regularly with the actual load value of system and target load threshold ratio and start when the actual load value reaches the target load threshold value or the recovery flow control; This method is:
The connection sign that whether allows the access service request is set in system, and the service request number that system allows access is set according to target load;
Adopt timer to circulate regularly, and in each timing cycle, judge whether to insert new service request according to described connection sign; And
The service request number that after inserting new service request, has inserted in the current timing cycle of accumulative total, and when the service request number that has inserted allows the service request of access to count greater than system, described connection identity marking is inserted for not allowing.
According to said method:
Triggering described timer when described system start-up begins regularly; Triggering described timer when perhaps being in the flow control state in system begins regularly.
If described connection sign is marked as and does not allow to insert in a timing cycle, then in this timing cycle, no longer insert new service request.
When each timing cycle of timer began, the service request that the call through sign is set to allow to insert and will insert was counted zero clearing.
Design capacity according to business module in the system and system calculates theoretical value allows the service request number of access as system initial value in advance; Perhaps draw a reasonable value allows the service request number of access as system initial value by test; Perhaps adopt system default value to allow the initial value of the service request number of access as system.
The service request number that described system allows to insert adopts fixed value, perhaps adopts dynamic value.
When system allows the service request number of access to adopt dynamic value,, compare update the system to allow the service request number that inserts system's actual load in last one-period and described target load at each timing cycle.
The present invention has following beneficial effect:
1, determine whether to allow new request to insert owing to insert number, thereby fluid control effect clearly, almost do not have time delay, and can judge that the scope of sign contracts very for a short time to Flow Control by service request.
The classification Flow Control of occupying as CPU is about to begin from 80%, and the present invention's Flow Control then can be given full play to the ability of system handles business in 90% beginning.
2, do not have violent fluctuation in Flow Control the time when system, no matter new service traffics are much, system's actual load can both better controlled in permissible range, can avoid system loading significantly to fluctuate.
3, because the present invention accurately controls the service request data of each timing cycle, therefore, when the Added Business request was several times of design capacity, system can not collapse yet, and can be maximum can carry out Business Processing, the impact resistance of system is greatly improved.
4, by after allowing the service request number of access to carry out smoothing processing to system, can the of short duration burst a large number of services request of normal process.
Description of drawings
Fig. 1 is the networking diagram of communication system;
The schematic diagram of Fig. 2 for allowing service request to insert;
The schematic diagram of Fig. 3 for not allowing the partial service request to insert.
Embodiment
Consult shown in Figure 1ly, mobile services switching centre in the mobile network (MSC) is a service processing equipment, and base station controller (BSC) and public telephone network (PSTN) are access device.Because mobile service is sudden.Telephone traffic is at ordinary times 2～10 times during such as the Mid-autumn Festival or the Spring Festival.The load of service processing equipment MSC may exceed several times of system design capacity in this case, and this just requires service processing equipment to have good Flow Control function, the impact that can resist Bulk Call.When carrying out Flow Control, manage business again as much as possible, satisfy client's demand as far as possible.
The present invention carries out Flow Control and realizes (as the Flow Control of the MSC among Fig. 1 porch at MSC and BSC and PSTN) at the system entry place, the timer that a timing cycle is set is scheduled duration circulates regularly, i.e. reset immediately after the timing of a timing cycle arrives and carry out the timing of next timing cycle.In each timing cycle, service access request quantity is accurately controlled,, all directly refuse at the system entry place for other unnecessary service request.This method is similar to the funnel principle, consults shown in Figure 2ly, and outlet is that size is certain, and when new service request during less than the service request of outlet, all business can both normal process; Consult shown in Figure 3ly, when new service request during greater than the service request of outlet, unnecessary service request is just directly refused, but certain service request can normally be inserted.
In order to realize the present invention, in system, be provided with call through sign FLAG, system allow the access service request count M and the access service request count N.System allows the access service request to count M and is meant under system loading permission situation the service request quantity that can handle.It then is access service request number in the timing cycle that N is counted in the access service request.
The value that system allows the access service request to count M can be fixed, and also can be dynamic change, can pass through manual configuration or dynamic-configuration to different business models or running environment.If system handles is professional single and stable, it can be fixed value that system allows the access service request to count the M value; If the type of service complicated business of system handles load is changeable, then system allow the access service request to count the M value this carries out in good time correction according to actual load and Flow Control target load.
When system just powers on, the service request that allows to insert is counted M must an initial value.The acquisition of this initial value can have number of ways.During system initialization, can calculate the initial value of the theoretical value service request number that permission inserts as system in advance according to the design capacity of business module in the system and system; Perhaps draw a reasonable value allows the service request number of access as system initial value by test; Perhaps adopt system default value as the initial value that system allows the service request number of access, allow system be in operation and oneself determine.Method of adjustment is as follows:
When system judges that the actual treatment load has reached the Flow Control target load, just directly N is counted in the request of current access service and allow the access service request to count M as system, also available the maximum or the mean value of access service request number allowed the service access request to count M as system former seconds.After system overload recovered, system allows the access service request to count the M value can be without conversion, the value that obtains when promptly adopting overload.
May also another kind of situation can appear, be that current system allows the access service request to count M value too small (too small as the M default value that system has been provided with when just operation has been got up), system's actual load will occur and not reach the Flow Control target load, but call out to insert and be designated the refusal access, so just can utilize the value of system's actual load and Flow Control target load to calculate a more reasonably M value, because the number of services of system loading and access is a linear relationship.As shown in Figure 4: inserted calling last one second (supposing that scheduled duration is 1 second) is 10, the M value of last one second also is 10, it is 20% that the CPU of last one second occupies, because last one second of access service request number reaches M value at that time, so having started call through sign FLAG calls out for refusal, promptly going up unnecessary calling in a second all has been rejected, when the next one judgement cycle arrives, find that FLAG inserts for refusal, but the CPU of last one second is overload not, therefore it is on the low side to judge the M value, and CPU is 0 when supposing not have service access, and then the M of next second should be 40.
Certainly because M situation bigger than normal also may appear in the difference of class of business.After system overload, when finding that one second system loading is bigger than last second system loading (also can be comprehensively to judge) by former seconds system loadings, illustrate that current M value is bigger than normal under new business model, can be modified to a slightly little value to the M value by the conversion of system loading.
Be labeled as the permission access when timer expiry then identifies call through FLAG, the N zero clearing is counted in the access service request simultaneously, allows the timing cycle of a new scheduled duration enough insert new calling.This be because last one-period the access service system treated, if access is not called out following one-period by system, system loading will lower, and FLAG is made as allow to insert be exactly can to carry out Business Processing for next periodic system.
In timing process, underlying operating system also will be judged the system loading situation, if system loading reaches corresponding Flow Control target load or Flow Control is recovered load, just starts or the recovery Flow Control, and revises accordingly allowing access service to count M.
In timing cycle, when the ingress for service place of communication system produces service request, judge whether call through sign FLAG is labeled as permission and inserts; If, then refuse described service request for not allowing to insert.If for allowing to insert, then insert the service request that has inserted in the current timing cycle of this service request and accumulative total and count N, the service request that several N after will adding up then and system's permission insert is counted M and is compared, count service request that N allow to insert greater than system when the service request that has inserted and the call through identity marking inserted for not allowing when counting M, and with the call through identity marking for not allowing access.
The triggering timer time regularly that begins can be divided into two kinds of situations:
1, for the very big system of phase service request number change amplitude weekly, be that the service access request number of system is may uprush several times of design capacity in a short period of time the time, will all trigger timer in each judgement cycle, control access service request quantity.Its purpose is exactly accurately to control the service request number that each timing cycle inserts, and system transships suddenly when preventing that with system service request is multiplied suddenly.
2, not very big system for phase service request quantity conversion amplitude weekly, be that service access request number is not at short notice during acute variation, can be when system have Flow Control, all requests all allow to insert, have only and when system reaches the Flow Control state, just trigger timer, the service request quantity that the control per second inserts can reduce the processing of system like this and load.
Consult shown in Figure 5ly, the processing in some timing cycles is as follows:
Step 5: system's electrifying startup, set an initial value to allowing the access service request to count M, prepare to carry out Business Processing.
Step 10: judge the relation of system's actual load and Flow Control target load, revise the M value.
At each timing cycle, actual load and target load according to a last timing cycle compare, if system does not reach the Flow Control target load, insert but call through is designated refusal, illustrate that the M value is less than normal, can calculate a new M by load and the target load of last one-period.If system is Flow Control, but former cyclic load illustrates that also increasing the M value is bigger than normal, can revise the M value smallerly again.
Step 20: the service request that will insert is counted N and is put 0, connects sign FLAG and is set to allow to insert and start timer.
Step 30: the system entry place receives a service request.
Step 40: judge whether connect sign FLAG is labeled as the permission access, if then carry out step 50; Otherwise refusal access service request (step 401).
Step 50: the access service request, and the service request that will insert is counted N and is added 1.
Be set to allow to insert sign owing to connected sign FLAG during beginning, therefore, for the service request that receives for the first time, system inserts it.
Step 60: whether the service request that has inserted after the judgement accumulative total is counted N and is allowed the access service request to count M greater than system in this cycle; Be set to not allow insert (step 601) if then connect sign FLAG; Otherwise continue step 70.
After the system start-up Flow Control, equal the service request that system allow to insert and count M if the service request that has inserted in the current timing cycle is counted N, then with the call through identity marking for not allowing access.
The utilization rate of system resource can be the utilization rate of CPU, and the situation of occupying of message bag resource, number of queues, bill pool etc. can be determined according to concrete needs.
Step 70: regularly whether arrive, carry out following one-period regularly if then forward step 10 to; Otherwise forward step 30 to and continue to handle next service request (it only is a signal that figure is relayed to step 30, and the another one service request is received in expression).
Fig. 5 only is an example, in order to limit processing sequence of the present invention, for when carrying out the flow process judgement, does not decide according to the setting of system.To the system that real-time is had relatively high expectations, the judgement of can in a timing cycle, repeatedly loading, and to the less demanding system of real-time, can in a plurality of timing cycles, just judge once.
After handling as step 401, also may be then to handle next service request, also may be to carry out system loading to judge and revise the M value, also may be to carry out other processing.
Flow Control design of the present invention can be controlled separately at different ingress for service places, also can also be used in combination with the Flow Control of other type in the unified control in the porch of different service types.When there is a plurality of different ingress for service in system, being provided with independently at each ingress for service, timer circulates regularly, and in the value that different inlets is provided with separately and computing system allows the service request of access to count M, but system's actual load and Flow Control target load are the loads that all business cause jointly.
For the timing cycle of timer, can be 1 second, also can be 100 milliseconds etc., the time can be decided with second still At All Other Times the requirement of real-time according to system.If the exigent system of timeliness can be with 100 milliseconds or littler time, the judgement of can repeatedly loading in one-period also can be judged actual load and Flow Control target load in a plurality of cycles.Therefore the judgement time for timing cycle (being scheduled duration) and system's actual load may come to be provided with flexibly according to specific circumstances.
Claims (9)
1, a kind of method of carrying out flow control in communication system, described communication system regularly with the actual load value of system and target load threshold ratio and start when the actual load value reaches the target load threshold value or the recovery flow control; It is characterized in that:
The connection sign that whether allows the access service request is set in system, and the service request number that system allows access is set according to target load;
Adopt timer to circulate regularly, and in each timing cycle, judge whether to insert new service request according to described connection sign; And
The service request number that after inserting new service request, has inserted in the current timing cycle of accumulative total, and when the service request number that has inserted allows the service request of access to count greater than system, described connection identity marking is inserted for not allowing.
2, the method for claim 1 is characterized in that, triggers described timer and begin regularly when described system start-up; Triggering described timer when perhaps being in the flow control state in system begins regularly.
3, method as claimed in claim 1 or 2 is characterized in that, if one regularly in the cycle described connection sign be marked as and do not allow to insert, then in this timing cycle, no longer insert new service request.
4, the method for claim 1 is characterized in that, when each timing cycle of timer began, the service request that the call through sign is set to allow to insert and will insert was counted zero clearing.
5, the method for claim 1 is characterized in that, the design capacity according to business module in the system and system calculates theoretical value allows the service request number of access as system initial value in advance; Perhaps draw a reasonable value allows the service request number of access as system initial value by test; Perhaps adopt system default value to allow the initial value of the service request number of access as system.
6, the method for claim 1 is characterized in that, the service request number that described system allows to insert adopts fixed value, perhaps adopts dynamic value.
7, method as claimed in claim 6, it is characterized in that, when system allows the service request number of access to adopt dynamic value,, compare update the system to allow the service request number that inserts system's actual load in last one-period and described target load at each timing cycle.
8, the method for claim 1 is characterized in that, the judgement of startup or recovery flow control can be carried out one or many in a timing cycle, also can carry out once at a plurality of timing cycles.
9, the method for claim 1, it is characterized in that, when there is a plurality of different ingress for service in system, at each ingress for service described timer is set separately and circulates regularly, and be provided with separately and computing system allows the service request number of access at different inlets.
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| CNB2004100370306A CN100370771C (en) | 2004-04-21 | 2004-04-21 | Method of flow control in communication system |
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| CNB2004100370306A CN100370771C (en) | 2004-04-21 | 2004-04-21 | Method of flow control in communication system |
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Cited By (14)
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| WO2008141548A1 (en) * | 2007-05-17 | 2008-11-27 | Huawei Technologies Co., Ltd. | A method and device of preventing attack for network equipment |
| CN101001140B (en) * | 2006-01-10 | 2010-08-18 | 中兴通讯股份有限公司 | Flow control method |
| WO2011023046A1 (en) * | 2009-08-28 | 2011-03-03 | 中兴通讯股份有限公司 | Method and device for implementing admission control |
| CN102711280A (en) * | 2012-05-18 | 2012-10-03 | 华为终端有限公司 | Method and device for network access |
| CN102892179A (en) * | 2011-07-22 | 2013-01-23 | 中兴通讯股份有限公司 | Load control method and device for radio access network |
| CN103685336A (en) * | 2012-08-31 | 2014-03-26 | 腾讯科技（深圳）有限公司 | Overload protection method, device and server |
| CN101779444B (en) * | 2006-05-02 | 2014-06-18 | 斯凯普公司 | User interface for handling call quality in a communication system |
| CN103973671A (en) * | 2014-04-09 | 2014-08-06 | 汉柏科技有限公司 | Method and device for controlling number of users accessing firewall of local area network |
| CN105281981A (en) * | 2015-11-04 | 2016-01-27 | 北京百度网讯科技有限公司 | Data traffic monitoring method and device for network service |
| CN108111433A (en) * | 2016-11-25 | 2018-06-01 | 阿里巴巴集团控股有限公司 | A kind of service dynamic flow control method, device and electronic equipment |
| CN109922509A (en) * | 2019-02-28 | 2019-06-21 | 重庆大学 | A kind of intelligent group's switching method in multiple networks fusion |
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| JPH08125707A (en) * | 1994-10-26 | 1996-05-17 | Hitachi Ltd | Flow control method |
| JPH11239163A (en) * | 1998-02-23 | 1999-08-31 | Nippon Telegr & Teleph Corp <Ntt> | Inter-lan flow control method and switch |
| JPH11340998A (en) * | 1998-05-27 | 1999-12-10 | Toshiba Microelectronics Corp | Atm switch and method for managing buffer for atm cell |
| CN1210919C (en) * | 2002-06-12 | 2005-07-13 | 华为技术有限公司 | Data flow control method in data insertion equipment |
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| CN101001140B (en) * | 2006-01-10 | 2010-08-18 | 中兴通讯股份有限公司 | Flow control method |
| CN101779444B (en) * | 2006-05-02 | 2014-06-18 | 斯凯普公司 | User interface for handling call quality in a communication system |
| WO2008141548A1 (en) * | 2007-05-17 | 2008-11-27 | Huawei Technologies Co., Ltd. | A method and device of preventing attack for network equipment |
| WO2011023046A1 (en) * | 2009-08-28 | 2011-03-03 | 中兴通讯股份有限公司 | Method and device for implementing admission control |
| CN101662799B (en) * | 2009-08-28 | 2012-06-13 | 中兴通讯股份有限公司 | Method and device for realizing admission control |
| CN102892179A (en) * | 2011-07-22 | 2013-01-23 | 中兴通讯股份有限公司 | Load control method and device for radio access network |
| CN102711280A (en) * | 2012-05-18 | 2012-10-03 | 华为终端有限公司 | Method and device for network access |
| CN102711280B (en) * | 2012-05-18 | 2015-09-09 | 华为终端有限公司 | A kind of method for network access and equipment |
| CN103685336B (en) * | 2012-08-31 | 2018-03-02 | 腾讯科技（深圳）有限公司 | overload protection method, device and server |
| CN103685336A (en) * | 2012-08-31 | 2014-03-26 | 腾讯科技（深圳）有限公司 | Overload protection method, device and server |
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| CN103973671B (en) * | 2014-04-09 | 2018-01-12 | 汉柏科技有限公司 | A kind of control method and device of LAN firewall number of users access |
| CN105281981A (en) * | 2015-11-04 | 2016-01-27 | 北京百度网讯科技有限公司 | Data traffic monitoring method and device for network service |
| CN105281981B (en) * | 2015-11-04 | 2019-04-02 | 北京百度网讯科技有限公司 | The data traffic monitoring method and device of network service |
| CN108111433A (en) * | 2016-11-25 | 2018-06-01 | 阿里巴巴集团控股有限公司 | A kind of service dynamic flow control method, device and electronic equipment |
| CN109922509A (en) * | 2019-02-28 | 2019-06-21 | 重庆大学 | A kind of intelligent group's switching method in multiple networks fusion |
| CN110247983A (en) * | 2019-06-27 | 2019-09-17 | 北京奇艺世纪科技有限公司 | A kind of equally loaded method and system |
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