CN1571538A - A method for performing system load control on mobile switch center - Google Patents
A method for performing system load control on mobile switch center Download PDFInfo
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Abstract
This invention relates to a system load control method of mobile exchange center. The procedures are that a overloading control process that independent run in system is built to initialize data and enter working state when the system is started or transferring of reserve machine to main machine. A super timer is set to send timer message to overloading control process in supporting system. CPU occupancy is detected and the system overloading or overloading release is determined unitedly to make sure whether to use overloading control and judge whether to accept or limit certain business. Businesses that allow accessing is set in schedule time interval to limit the exceeding business when the overloading control is needed. System load control complexity is reduced by this method and it is convenient to unified management and maintenance. Load fluctuation in load control is reduced and load control failure is avoided by this invention.
Description
Technical field
The present invention relates to a kind of method of system loading control, relate in particular to a kind of implementation method of the MSC (mobile switching centre) in CDMA (code division multiple access) communication system being carried out overloading control.
Background technology
In CDMA mobile communication system, MSC is in core position (as shown in Figure 1), and it constitutes the Signaling System Number 7 net by signaling and other entity real-time, interactive jointly with other entity.MSC is the functional entity that the travelling carriage that is positioned at its area of coverage (MS) is controlled, exchanged, and also is that mobile communication system and public telephone network (PSTN), Integrated Service Digital Network, the packet switching network (PSPDN) and other move the interface of switching network.The MSC functions such as calling control that switching center finished in finishing fixed network, also to finish functions such as RRM, mobile management.In addition, in order to be set up to the calling route of travelling carriage, each MSC also should be able to finish the function of inlet (GMSC), promptly inquires about the function of location of mobile station information.
MSC is in order to finish above-mentioned functions, need with the mutual a large amount of signaling message of other inter-entity, the flow of various message is dynamic changes, clear and definite effectively flow control methods is not provided in No.7 nation-wide Network, so, MSC may be owing to receiving that at short notice a large amount of message causes system's overload, cause systematic function sharply to descend even paralysis, when making troubles to the user, cause very big economic loss also for office side, what is more important has been damaged corporate image, has influenced the sale of product.This all is reluctant to see concerning each side.Therefore, must control effectively, make it can spend the message peak period reposefully handling under the situation of message number to greatest extent the system loading of MSC, thus the normal operation of the system of assurance.
In China Patent No. is 99117082.2 " a kind of method that realizes overloading control in mobile switching centre's application layer ", a kind of overladen control method is provided, the characteristics of this patent are: (1) regularly determines corresponding traffic class; (2) relatively determine to implement the flow control rank; (3) judge whether MSC transships; (4) receive that business initial message adopts corresponding flow control methods according to traffic class.Its shortcoming is: (1) determines the mode complexity of traffic class, causes system out of control easily; (2) being provided with of timer lacks protection, and when timer was provided with failure, system lost the load control ability; (3) each module all has the overloading control mode of a cover oneself, is unfavorable for unified management and maintenance.These shortcomings all embody in the actual motion of system to some extent.
In addition, in China Patent No. is in " method of overloading control in the code vision multiple address cellular mobile communication system " of 00127306.X, a kind of overload control method is also proposed, its control method and above-mentioned patent are similar, also be to adopt the method for controlling by traffic class, the method of discrimination that is characterized in (1) traffic class is the occupation rate according to CPU, has simplified definite method of traffic class; (2) when the flow system flow controlled stage is the minimum flow controlled stage, message is all inserted; (3) when the flow system flow controlled stage is the maximum flow controlled stage, message is all refused; (4) when flow system flow is between minimum flow controlled stage and maximum flow controlled stage, appoints and to get a random number and maximum flow level and deduct the flow system flow controlled stage and add 1 again and ask mould.Its shortcoming is: fundamentally do not solve the too complicated drawback of overloading control mechanism, and when the overloading control process, allow the message number of system handles that bigger fluctuation is arranged, be unfavorable for the stable of system, especially be that maximum flow controlled stage and timer are provided with when failure in the flow system flow controlled stage, all business all are rejected, and cause system's torpor.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of mobile switching centre being carried out system loading control, adopt the mode of centralized detecting, decentralized control, set up an independently overloading control process, process provides unified calling interface for each business module thus, is convenient to unified management and maintenance.
Another object of the present invention is to provide a kind of method that mobile switching centre is carried out system loading control, adopt the unique Rule of judgment of the occupancy of CPU, reduce the complexity that whether system is in the Rule of judgment of overload state as overload state.
Another purpose of the present invention is to provide a kind of method that mobile switching centre is carried out system loading control, increases refusal controlling mechanism at interval, further reduces the load fluctuation of system during being in overloading control.
A further object of the present invention is to provide a kind of method of mobile switching centre being carried out system loading control, use super timer, regularly give overloading control process transmission timer time exceeded message by support system, avoided causing that because of timer is provided with failure load control fails and system refuse all professional serious consequences.
To achieve these goals, the invention provides a kind of method that mobile switching centre is carried out system loading control, this method comprises the steps:
Step 1, set up an overloading control process, independent operating is in system of described mobile switching centre, for each business module of system of described mobile switching centre provides unified calling interface, enter initial condition, and when transferring main frame to, carry out data initialization in described system start-up or by standby host, enter operating state;
Step 2, described overloading control process is provided with a super timer by support system, in the time of in working order, sends once super timer message for described overloading control process every a predetermined interval by support system;
Step 3, the detection system CPU usage unified determines that system's overload or overload remove, and determining whether carrying out overloading control, and judges whether to accept or limit certain business;
Step 4 when needs carry out overloading control, in described predetermined interval, is set the professional number that allows access, and the business that surpasses quantity is limited;
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, its characteristics are, in described predetermined interval, described overload process is added up respectively by type of service the professional number of acceptance and the professional number of refusal, and after receiving described super timer message, according to the current CPU usage of every statistical value and system in the predetermined interval, the overloading control parameter is dynamically adjusted.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, its characteristics are, it is to refuse to come the limit service number at interval by adopting to increase that the described business that surpasses quantity is limited, and the professional number that will limit is distributed in the whole time interval as far as possible equably.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, its characteristics are, in step 3, described system is according to CPU usage, four threshold values are set respectively: underload threshold value＜normal door limit value＜early warning threshold value＜overload threshold value, and the system loading state is divided into five zones: low load region, normal duty district, buffering area, early warning loading zone and overload district.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, and its characteristics are, in step 3, judge system's overload or overload releasing, to determine whether the judgment condition of carrying out overloading control are:
When system CPU occupancy rate surpassed the early warning threshold value, system entered overload state, begins to carry out overloading control;
When system CPU occupancy rate during less than the early warning threshold value, and system is not when abandoning message, and the deactivation system overload state is no longer carried out overloading control;
If system is in overload state in the last time interval, and exists and abandon message,, need carry out overloading control even CPU usage less than the early warning threshold value, also still is in overload state.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, its characteristics are, described overloading control process is by calling its support interface, obtain CPU usage, the professional number of the system loading state of coupling system data recordng and restriction, judge current system loading state and carry out corresponding control and adjustment:
When system CPU occupancy rate surpasses the early warning threshold value, but system data area does not record overload, and then judgement system enters overload state, and the initial value of overloading control parameter is set;
When system CPU occupancy rate surpasses the early warning threshold value, and system data area records overload, and then system is in overload state always, adjusts the overloading control parameter;
When system CPU occupancy rate during less than the early warning threshold value, and system data area records overload, then judges whether to exist the professional number of restriction, if conditional professional number then keeps overload state, adjusts the overloading control parameter; If hard-core professional number, then deactivation system overload state;
When system CPU occupancy rate during less than the early warning threshold value, and the data field do not record overload, then is in normal condition always.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, its characteristics are, described overloading control parameter comprise at least refusal at interval, the professional number that allows in the predetermined interval to accept in the professional number of accepting in the maximum traffic number that inserts, the last predetermined interval, the current predetermined interval, the professional number that limit at interval because of refusal and the professional number that limits because of the professional number that allows access one or more.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, and its characteristics are, to allowing the method for adjustment of the maximum traffic number of access in the predetermined interval are:
When CPU usage surpasses the overload threshold value, reduce the professional number that allows access with whole decline step-length;
When CPU usage was between early warning threshold value and overload threshold value, step-length reduced the professional number that allows access partly to descend;
When system is in overload state, and still conditional professional number, CPU usage is in buffering area the time, do not adjust to allow the professional number that inserts.
When system is in overload state, and still conditional professional number, CPU usage is between underload threshold value and normal door limit value the time, increases with the step-length that partly rises to allow the professional number that inserts.
When system is in overload state, and still conditional professional number, CPU usage is during less than the underload threshold value, increases with whole rising step-length to allow the professional number that inserts.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, and its characteristics are, to the method for adjustment of refusing size at interval are:
When system has just entered overload state, if CPU usage greater than the overload threshold value, then adopts one first initial value as refusal initial value at interval;
When system had just entered overload state, if CPU usage between early warning threshold value and overload threshold value, then adopts one second initial value as refusal initial value at interval, and described second initial value was greater than described first initial value;
System is under the overladen state, after each predetermined time interval is overtime, according to the professional situation of refusal in the previous predetermined time interval, adjusts refusal at interval;
When refusal at interval is lower than the early warning thresholding greater than a preset value and system loading, then do not use refusal to carry out traffic limits at interval;
Described refusal minimum value at interval is 2, and maximum is 50.
Above-mentioned carries out the method that system loading is controlled to mobile switching centre, and its characteristics are that described statistic processes comprises the steps:
The business process of described each business module calls the interface function that described overloading control process provides when receiving new service message, according to the type of service of this access, and the load condition of current system, whether decision limits this business; Described unified calling interface provides interface function, according to current system loading state, the professional number that allows access and refusal at interval, determine whether to limit this business, returning analog value continues or limits this business continuing for each business module, and when accepting this business, the professional number of accepting in will the current unit interval corresponding with this type of service adds 1, limiting this when professional, professional number that limit at interval because of refusal that will be corresponding with this type of service or the professional number that limits because of the professional number that allows access add 1;
After receiving described super timer message, the mean value of getting the professional number of accepting in interior professional number of accepting of last predetermined interval and the current unit interval is updated to the professional number of accepting in the last unit interval;
After the adjustment that finishes described overloading control parameter, remove all statistical values in the current predetermined interval, so that the statistics of next predetermined interval.
In addition, method of mobile switching centre being carried out system loading control of the present invention, described overloading control process is when entering overload or removing overload, all alarm to the backstage of system, and under overload state, according to the log record of setting at interval, send notice to the backstage, report current load condition, and each business number of times of being accepted and refusing, be used for backstage log file.The related class of business of the inventive method comprises: the spoken sound of A rises and exhales, the A mouth rises and exhales short message, the renewal of A mouth position, MAP to exhale short message, TCAP dialogue ID, TUP incoming call, ISUP incoming call eventually, and the CAS incoming call.
Simultaneously, described overloading control process of the present invention is when entering operating state or initial condition, also comprise the step that a pair of overloading control parameter is checked, just starting overloading control process after checking, described overloading control parameter adopts system's backstage configuration.And, needs are carried out the access service of overloading control, carry out abandoning Message Processing.Different service types by the step-length of different rising and decline is set, is realized different service types is carried out the control of different priorities.
System loading control method of the present invention with the unique Rule of judgment of CPU usage as overload state, has reduced the complexity that whether system is in the Rule of judgment of overload state; And, set up an independently overloading control process by adopting the mode of centralized detecting, decentralized control, process provides unified calling interface for each business module thus, is convenient to unified management and maintenance.In addition, also increased refusal controlling mechanism at interval, further reduced the load fluctuation of system during being in overloading control, and by using timer, regularly give overloading control process transmission timer message by support system, avoided refusing all professional serious consequences because of timer is provided with overloading control inefficacy and the system that causes that fail.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is each logical functional entity figure of CDMA digital cellular mobile communication systems;
Fig. 2 is system loading thresholding figure of the present invention;
Fig. 3 is a system of the present invention access service exemplary plot; And
Fig. 4 is of the present invention one preferable overloading control workflow diagram.
Embodiment
Overloading control comprises two key factors, the adjustment of the detection of overload state and overloading control data.
Overloading control needs the current load condition of detection system, to determine whether carrying out overloading control.From laboratory's test result, and Commercial deployment experience, memory usage and data field occupancy etc. all can not detect index as the efficient system load, the index that influences system stable operation mainly is a CPU usage, thus the present invention CPU usage as unique system loading status detection index.Consider that CPU usage constantly changes, the promptness that detects is to effective control effects of load, and frequent detection action can adopt 2 second time interval as predetermined interval to the influence of systematic function, regularly detect CPU usage, and need to judge whether overloading control.
And because system loading is mainly produced by business, therefore the control of load is controlled business exactly, and need control from the source of business.For MSC, mainly be the business of control A mouth, MAP, TUP/ISUP/CAS, and the dialogue ID of TCAP.The disposal ability of system often adopts BHCA to weigh, the number of services that can handle in the unit interval just, and therefore, overloading control also adopts the professional number of times of restricted unit time at interval to carry out.
And in order to design the algorithm of overloading control effectively, the present invention can consider from the following aspects:
(1) traffic carrying capacity of control connecting system, need control at the place, source of service access system, promptly control at A mouth, MAP, TCAP and TUP/ISUP/CAS place, the class of business of control comprises: the spoken sound of A rises and exhales, the A mouth rises and exhales short message, the renewal of A mouth position, MAP to exhale short message, TCAP dialogue ID, TUP incoming call, ISUP incoming call eventually, and the CAS incoming call.
(2) be accustomed to from user's dialing,, in most cases, can initiate new calling immediately, therefore need to prolong the time of user of redialing, in order to avoid strengthen system's telephone traffic at short notice if call is unsuccessful.Like this, needs being carried out the calling of overloading control, is not to fail immediately, but abandons Message Processing, does not respond any response message.
(3) overloading control need be kept certain traffic handing capacity, calls out called half and should not control, otherwise cause new reattempt on the contrary.
(4) with respect to timely releasing overloading control, guarantee that system stable operation is the most critical, therefore take quick control, slowly the strategy that recovers avoids the overloading control releasing too fast, causes new overload.
In sum, overload control method of the present invention mainly adopts the mode of centralized detecting, decentralized control, so that safeguard and expansion.It mainly comprises the steps:
Step 1, set up an overloading control process, independent operating is in system of described mobile switching centre, for each business module of system of described mobile switching centre provides unified calling interface, enter initial condition, and when transferring main frame to, carry out data initialization in described system start-up or by standby host, enter operating state.Described overloading control process enters initial condition when transferring standby host to by main frame.
Step 2, described overloading control process is provided with a super timer by support system, in the time of in working order, sends once super timer message for described overloading control process every a predetermined interval.For fear of being set because of timer, overloading control inefficacy and the system that causes that fail refuse all professional serious consequences, the employing that the present invention is preferable super timer, and preferable with 2 seconds as a predetermined interval, regularly give overloading control process transmission timer message by support system.Super timer is to be provided with or to be discharged by support system, does not need overloading control process to be provided with or discharges, and does not also just have the situation that the timer failure is set.Certainly, also can adopt general timer to realize effect of the present invention, these are not as limitation of the present invention.General timer is provided with by overloading control process or operation layer or discharges, if failure is set, may cause more serious consequence (as causing resource from suspending or systemic breakdown).
Step 3, the detection system CPU usage unified determines that system's overload or overload remove, and determining whether carrying out overloading control, and judges whether to accept or limit certain business.In order to reduce the complexity that whether system is in the Rule of judgment of overload state, the present invention preferable with the occupancy of CPU unique Rule of judgment as overload state.
Step 4 when needs carry out overloading control, in described predetermined interval, is set the professional number that allows access, and the business that surpasses quantity is limited.Wherein, when needs carry out overloading control, can be preferable with 2 seconds as this predetermined interval, the professional number that set to allow inserts limits the business that surpasses quantity.
Preferable, in step 4, in described predetermined interval, described overload process is added up respectively by type of service the professional number of acceptance and the professional number of refusal, and after receiving described super timer message, according to the current CPU usage of every statistical value and system in the predetermined interval, the overloading control parameter is dynamically adjusted, thereby control is loaded effectively.Wherein said overloading control parameter comprise at least refusal at interval, the professional number that allows in the unit interval to accept in the professional number of accepting in the maximum traffic number that inserts, the last unit interval, the current unit interval, the professional number that limits because of the refusal interval and the professional number that limits because of the professional number of permission access one or more.The present invention mainly is to adjust maximum traffic number and the current refusal size at interval that current permission inserts to the adjustment of overloading control parameter, and its method of adjustment sees specific embodiment described later for details.
As shown in Figure 4, be of the present invention one preferable overloading control workflow diagram.It comprises the steps:
Step 403 if other incident except that the described incident of step 402 takes place in system, then enters step 405;
Step 407 if main frame changes standby host, then enters step 409;
Step 408 if super timer event takes place, then enters step 410;
Step 410 is carried out the inspection of overloading control relevant parameter;
Step 411 is carried out the adjustment of overloading control data;
Step 412 returns to the overloading control process operating conditions.
In the present invention, as shown in Figure 2, consider the succinct, effective of routine processes, and the validity of overloading control, the present invention is according to CPU usage, get 4 threshold values, underload threshold value＜normal door limit value＜early warning threshold value＜overload threshold value is divided into 5 zones with the system loading state: low load region, normal duty district, buffering area, early warning loading zone and overload district.Wherein, the threshold value of each CPU usage, and " rising step-length " and " decline step-length " are determined by the backstage configuration.Control for convenience, step-length represent that with percentage expression increases or reduce the ratio of " the professional number that permission inserts " in current 2 seconds.In order to realize different business is carried out the control of different priorities, different risings and decline step-length can be set respectively.
And under normal circumstances, system CPU occupancy rate judges that less than the early warning thresholding condition of system's overload and releasing is:
(1) when system CPU occupancy rate surpassed the early warning thresholding, the judgement system entered overload state, begins to carry out overloading control.
(2) when system CPU occupancy rate less than the early warning thresholding, and system is not when abandoning message, the deactivation system overload state is no longer carried out overloading control.
(3) if system is in overload state in the last time interval, and exists and to abandon message,, need carry out overloading control even CPU less than the early warning thresholding, also still is in overload state.
MSC of the present invention system is at operating conditions, after receiving super timer message, described overloading control process is called its support interface, and obtain CPU usage, the system loading state of binding data district record and (" because of the professional number of refusing to limit at interval "+" the professional number that the professional number that inserts because of permission limits "), judge current MSC system mode and carry out corresponding control and adjustment:
(1) if CPU is higher than the early warning thresholding, but overload is not write down in the data field, and then judgement system enters overload, and the initial value of " the professional number that allows access " and overloading control parameters such as " refusal at interval " to the backstage alarm, is set.
(2) if CPU is higher than the early warning thresholding, and data record has overload, then is in overload state always, adjusts " allow insert professional number " and overloading control parameters such as " refusal intervals ".
(3) if CPU is lower than the early warning thresholding, but data recordng has overload, then judge (" because of the professional number of refusing to limit at interval "+" the professional number that the professional number that inserts because of permission limits "), if conditional professional number, then keep overload state, adjust " the professional number of permission access " and " refusing at interval " etc.; If hard-core professional number is then removed overload state, and send alarm clearing to the backstage.
(4) if CPU is lower than the early warning thresholding, and the data field do not write down overload, then is in normal condition always.
During system's overload, receive super timer message after, overloading control process is according to current C PU occupancy, adjusts " allow insert professional number ".Its method of adjustment is:
(1) when CPU usage surpasses the overload thresholding, reduces " the professional number that allows access " with whole decline step-length.
(2) when CPU usage is between early warning thresholding and overload thresholding, reduce " the professional number that allows access " with the step-length that partly descends.
(3) be in overload state (remove, still conditional business) when system, CPU usage is in buffering area the time, do not adjust " allow insert professional number ".
(4) be in overload state (remove, still conditional business) when system, CPU usage increases " the professional number that allows access " with the step-length that partly rises between underload thresholding and normal thresholding the time.
(5) be in overload state (remove, still conditional business) when system, CPU usage is during less than the underload thresholding, increases " allow insert professional number " with whole rising step-length.
In addition, because after the number of services that the present invention adopts the interior at interval permission of control certain hour to insert is come the control system load, in each time interval, to in preceding half time period, accept business, business is refused in half time period in the back, the business of accepting is quite concentrated, can impact to system handles, still be unfavorable for reducing system loading, therefore, the present invention has also increased refusal controlling mechanism at interval, adopt the certain refusal of increase to come the limit service number at interval, simultaneously, for this " refusal is at interval " value reasonably is set under different telephone traffic situations, the professional number of restriction is distributed in the whole time interval as far as possible equably, and need carries out to a certain degree adjustment at interval this:
When (1) system has just entered overload state, if CPU usage greater than the overload thresholding, then adopts one first initial value as refusal initial value at interval, as be 2, promptly per 2 service denials are once professional.
When (2) system has just entered overload state, if CPU usage between early warning thresholding and overload thresholding, then adopts one second initial value as refusal initial value at interval, as be 4, promptly per 4 service denials are once professional.
(3) system is under the overladen state, after each time interval is overtime,, adjust " refusal at interval " according to the professional situation of refusal in the previous time interval, in order to prevent to be subjected to the influence of number of services fluctuation, this is adjusted with certain percentage at interval at every turn.
(4) when system loading is lower than the early warning thresholding since with the message count of refusal as removing overladen condition, refusal existence at interval may make that refuse information exists always, unless " refusal at interval " greater than the professional sum in the time interval.Therefore, when " refusal at interval " is lower than the early warning thresholding greater than a preset value and system loading, then do not use refusal to carry out traffic limits at interval.For example, when " refusal at interval " greater than 20 and system loading when being lower than the early warning thresholding, then do not use refusal to carry out traffic limits at interval.
(5) refusal should have certain scope at interval, and minimum value is 2, and maximum is 50.
After under the overload situation, adopting " refusal at interval " that the business that inserts is limited, in each time interval, the situation of system's access service as shown in Figure 3.As shown in Figure 3, the total traffic that inserts in the unit interval of supposing the system is A, the refusal that is provided with is spaced apart B, the professional number that allows to insert is C, the professional number that limits at interval because of refusal is D, and the professional number that limits because of the professional number that allows to insert is E, and the professional number that this refusal interval B will refuse is distributed in the whole unit interval uniformly, and, A=B+C+D+E.
To describe the present invention in detail with a specific embodiment below, wherein, with 2 seconds be the unit interval, super timer sent a time exceeded message in per 2 seconds.
For different business is carried out traffic volume measurement and overloading control, the overload process provides interface function to call for business process such as A mouths, business process such as A mouth call this function interface, and determine whether to continue to continue according to return value when receiving new service message.Function interface is:
BYTE?IsServiceLimited(BYTE?wServiceType)
Wherein return value is that 0 and 1,0 expression is professional unrestricted and normally continue, and 1 expression is professional restricted.
In interface function, according to the type of service of this access, and current system loading state, whether decision limits this business, simultaneously the traffic carrying capacity in per 2 seconds is added up, safeguard the data of overloading control process, shown in following table (overloading control tables of data):
| Type of service | The professional number of accepting in preceding 2 seconds | The professional number of accepting in current 2 seconds | Because of the professional number of refusing to limit at interval | The professional number that the professional number that inserts because of permission limits | Refusal at interval | Allow the professional number of access |
| The spoken sound of A rises exhales | ????50 | ????50 | ????10 | ????20 | ????5 | ????50 |
| A mouth note rises exhales | ||||||
| A mouth position is upgraded | ||||||
| The MAP short message final calling | ||||||
| TUP goes into to exhale | ||||||
| ISUP goes into to exhale | ||||||
| CAS goes into to exhale | ||||||
| TCAP talks with ID |
Wherein, the flow of " the professional number of accepting in preceding 2 seconds " statistical service, the initial value that conduct when being used for overload " allows the professional number of access "; " the professional number of accepting in current 2 seconds " is used for upgrading " the professional number of accepting in preceding 2 seconds "; The professional number statistics of refusal is used for as removing overladen Rule of judgment, and " the professional number that the professional number that inserts because of permission limits " is used for as the foundation of adjusting " refusal interval ", if too big, then explanation need reduce " refusal at interval "; " refusal at interval " and " allowing the professional number of access " in each time interval overtime after, adjust by overloading control process.
When function is called, under the normal condition, add 1 to " in current 2 seconds accept professional number " of type of service correspondence.After receiving super timer message " the professional number of accepting in current 2 seconds " is updated to " the professional number of accepting in preceding 2 seconds ",, gets (" the professional number of accepting in preceding 2 seconds "+" the professional number of accepting in current 2 seconds ")/2 in order to prevent professional number fluctuation.Under the overload situation, go out " the professional number that allows access ", and control the quantity of new access service in view of the above according to the overladen level calculation of system.
Because overloading control has adopted the control variables of backstage configuration, being provided with of parameter is extremely important, otherwise may be when enabling overloading control, cause system's operation disorderly, therefore must check these parameters judge it whether in the scope of setting, and whether the size order of each parameter is reasonable, otherwise do not enable overloading control, and alarm to the backstage.Overloading control process is checked these parameters when MSC startup or masterslave switchover, then checked once in per 2 seconds later on if find mistake; After inspection is passed through, checked once in later per 10 minutes.After inspection is passed through, actual when quoting these Control Parameter, no longer check.
The overloading control module provides interface function, according to current system loading state, and " allowing the professional number of access " and " refusal at interval ", determine whether to limit this business, if accept this business, add 1 to " the professional number of accepting in current 2 seconds " of type of service correspondence; If limit this business, add 1 to " the professional number that the professional number that inserts because of permission limits ", perhaps add 1 to " because of the professional number of refusing to limit at interval ".
MSC is in operating conditions, receive super timer message after, get (" in preceding 2 seconds accept professional number "+" the professional number of accepting in current 2 seconds ")/2, be updated to " the professional number of accepting in preceding 2 seconds ".Described overloading control process is called its support interface, and obtain CPU usage, the system loading state of binding data district record and (" because of the professional number of refusing to limit at interval "+" the professional number that the professional number that inserts because of permission limits "), judge current MSC system mode and carry out corresponding control and adjustment:
(1) if CPU is higher than the early warning thresholding, but overload is not write down in the data field, and then judgement system enters overload, and the initial value of " the professional number that allows access " and overloading control parameters such as " refusal at interval " to the backstage alarm, is set.
(2) if CPU is higher than the early warning thresholding, and data record has overload, then is in overload state always, adjusts " allow insert professional number " and overloading control parameters such as " refusal intervals ".
(3) if CPU is lower than the early warning thresholding, but data recordng has overload, then judge (" because of the professional number of refusing to limit at interval "+" the professional number that the professional number that inserts because of permission limits "), if conditional professional number, then keep overload state, adjust " the professional number of permission access " and " refusing at interval " etc.; If hard-core professional number is then removed overload state, and send alarm clearing to the backstage.
(4) if CPU is lower than the early warning thresholding, and the data field do not write down overload, then is in normal condition always.
Remove all statistical values in current 2 seconds at last, so that the statistics in the next time interval.
Overloading control process is alarmed to the backstage when entering overload and removing overload.In addition, under overload state, according to the log record of setting at interval, send notice, report current load condition to the backstage, and each business number of times of being accepted and refusing, be used for backstage log file.
In sum, the present invention has realized a kind of scheme of overloading control, has adopted a plurality of new measures to come the assurance scheme effectively to play a role.By in real system, using, show that this is a kind of simple and effective overload control method, make system keep the higher data disposal ability, and make the performance of whole system during overloading control, remain a comparatively level and smooth curve, well guaranteed the stable operation of system.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, a kind of method that mobile switching centre is carried out system loading control is characterized in that, comprises the steps:
Step 1, set up an overloading control process, independent operating is in system of described mobile switching centre, for each business module of system of described mobile switching centre provides unified calling interface, enter initial condition, and when transferring main frame to, carry out data initialization in described system start-up or by standby host, enter operating state;
Step 2, described overloading control process is provided with a super timer by support system, in the time of in working order, sends once super timer message for described overloading control process every a predetermined interval;
Step 3, the detection system CPU usage unified determines that system's overload or overload remove, and determining whether carrying out overloading control, and judges whether to accept or limit certain business;
Step 4 when needs carry out overloading control, in described predetermined interval, is set the professional number that allows access, and the business that surpasses quantity is limited.
2, method of mobile switching centre being carried out system loading control according to claim 1, it is characterized in that, in described predetermined interval, described overload process is added up respectively by type of service the professional number of acceptance and the professional number of refusal, and after receiving described super timer message, according to the current CPU usage of every statistical value and system in the predetermined interval, the overloading control parameter is dynamically adjusted.
3, method of mobile switching centre being carried out system loading control according to claim 1, it is characterized in that, it is to refuse to come the limit service number at interval by adopting to increase that the described business that surpasses quantity is limited, and the professional number that will limit is distributed in the whole time interval as far as possible equably.
4, according to claim 1 or 2 or 3 described methods of mobile switching centre being carried out system loading control, it is characterized in that, in step 3, described system is according to CPU usage, four threshold values are set respectively: underload threshold value＜normal door limit value＜early warning threshold value＜overload threshold value, and the system loading state is divided into five zones: low load region, normal duty district, buffering area, early warning loading zone and overload district.
5, the method that mobile switching centre is carried out system loading control according to claim 4 is characterized in that, in step 3, judges system's overload or overload releasing, to determine whether the judgment condition of carrying out overloading control is:
When system CPU occupancy rate surpassed the early warning threshold value, system entered overload state, begins to carry out overloading control;
When system CPU occupancy rate during less than the early warning threshold value, and system is not when abandoning message, and the deactivation system overload state is no longer carried out overloading control;
If system is in overload state in the last time interval, and exists and abandon message,, need carry out overloading control even CPU usage less than the early warning threshold value, also still is in overload state.
6, method of mobile switching centre being carried out system loading control according to claim 5, it is characterized in that, described overloading control process is by calling its support interface, obtain CPU usage, the professional number of the system loading state of coupling system data recordng and restriction, judge current system loading state and carry out corresponding control and adjustment:
When system CPU occupancy rate surpasses the early warning threshold value, but system data area does not record overload, and then judgement system enters overload state, and the initial value of overloading control parameter is set;
When system CPU occupancy rate surpasses the early warning threshold value, and system data area records overload, and then system is in overload state always, adjusts the overloading control parameter;
When system CPU occupancy rate during less than the early warning threshold value, and system data area records overload, then judges whether to exist the professional number of restriction, if conditional professional number then keeps overload state, adjusts the overloading control parameter; If hard-core professional number, then deactivation system overload state;
When system CPU occupancy rate during less than the early warning threshold value, and the data field do not record overload, then is in normal condition always.
7, method of mobile switching centre being carried out system loading control according to claim 6, it is characterized in that, described overloading control parameter comprise at least refusal at interval, the professional number that allows in the predetermined interval to accept in the professional number of accepting in the maximum traffic number that inserts, the last predetermined interval, the current predetermined interval, the professional number that limit at interval because of refusal and the professional number that limits because of the professional number that allows access one or more.
8, the method that mobile switching centre is carried out system loading control according to claim 7 is characterized in that, to allowing the method for adjustment of the maximum traffic number of access in the predetermined interval is:
When CPU usage surpasses the overload threshold value, reduce the professional number that allows access with whole decline step-length;
When CPU usage was between early warning threshold value and overload threshold value, step-length reduced the professional number that allows access partly to descend;
When system is in overload state, and still conditional professional number, CPU usage is in buffering area the time, do not adjust to allow the professional number that inserts.
When system is in overload state, and still conditional professional number, CPU usage is between underload threshold value and normal door limit value the time, increases with the step-length that partly rises to allow the professional number that inserts.
When system is in overload state, and still conditional professional number, CPU usage is during less than the underload threshold value, increases with whole rising step-length to allow the professional number that inserts.
9, according to claim 7 mobile switching centre is carried out the control method of system loading, it is characterized in that, be the method for adjustment of refusal size at interval:
When system has just entered overload state, if CPU usage greater than the overload threshold value, then adopts one first initial value as refusal initial value at interval;
When system had just entered overload state, if CPU usage between early warning threshold value and overload threshold value, then adopts one second initial value as refusal initial value at interval, and described second initial value was greater than described first initial value;
System is under the overladen state, after each predetermined time interval is overtime, according to the professional situation of refusal in the previous predetermined time interval, adjusts refusal at interval;
When refusal at interval is lower than the early warning thresholding greater than a preset value and system loading, then do not use refusal to carry out traffic limits at interval;
Described refusal minimum value at interval is 2, and maximum is 50.
10, the method that mobile switching centre is carried out system loading control according to claim 7 is characterized in that described statistic processes comprises the steps:
The business process of described each business module calls the interface function that described overloading control process provides when receiving new service message, according to the type of service of this access, and the load condition of current system, whether decision limits this business;
Described unified calling interface provides interface function, according to current system loading state, the professional number that allows access and refusal at interval, determine whether to limit this business, returning analog value continues or limits this business continuing for each business module, and when accepting this business, the professional number of accepting in will the current unit interval corresponding with this type of service adds 1, limiting this when professional, professional number that limit at interval because of refusal that will be corresponding with this type of service or the professional number that limits because of the professional number that allows access add 1;
After receiving described super timer message, the mean value of getting the professional number of accepting in interior professional number of accepting of last predetermined interval and the current unit interval is updated to the professional number of accepting in the last unit interval;
After the adjustment that finishes described overloading control parameter, remove all statistical values in the current predetermined interval, so that the statistics of next predetermined interval.
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