CN101965007A - Congestion control method and device for base station - Google Patents
Congestion control method and device for base station Download PDFInfo
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- CN101965007A CN101965007A CN200910157660XA CN200910157660A CN101965007A CN 101965007 A CN101965007 A CN 101965007A CN 200910157660X A CN200910157660X A CN 200910157660XA CN 200910157660 A CN200910157660 A CN 200910157660A CN 101965007 A CN101965007 A CN 101965007A
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Abstract
The invention provides a congestion control method and a congestion control device for a base station, and belongs to the field of wireless communication. The method comprises the following steps of: dividing a congestion state into different classes and presetting a corresponding congestion control mode for each class of congestion state; acquiring the judgment parameter of the congestion state; judging the class of the congestion state in the current period according to the judgment parameter of the congestion state; and executing the congestion control mode corresponding to the class of the congestion state according to the judged class of the congestion state. The device comprises a setting module, an acquisition module, a judgment module and an execution module. The technical scheme provided by the invention can solve the problem that only a service quality frame is provided but a corresponding method for realizing congestion control is lacked in the prior art and contributes to service development.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of congestion control method and device that is used for the base station.
Background technology
For a network, when to the demand of resource the time, just occurred congestedly greater than current available resource, resource wherein can be central processing unit (CPU, Central Processing Unit) resource, bandwidth resources, power resource etc.Congested control at first require when system design, to consider as far as possible might cause congested all factors, but for wireless network, because the uncertainty of wireless environment, user's uncertainty, no matter how perfect system design is, how perfect admit and control do, it is impossible avoiding occurring congested fully.Congested for what prevent to occur, handle occurent congestedly, just need a congestion control mechanism, at this moment, need to consider in advance Congestion Avoidance, congested processing afterwards and last congested recovery.
Whole world microwave interoperability (WiMAX, Worldwide Interoperability for MicrowaveAccess) in the system 5 kinds of service quality (QoS is arranged, Quality of Service) business of type, be respectively: Unsolicited Grant Service (UGS, Unsolicited Grant Service) business, Real Time-Variable Bit Rate/expansion Real Time-Variable Bit Rate (RTVR/ERTVR, Real-Time Variable-Rate/ExtendedReal-Time Variable-Rate) business, Non Real Time-Variable Bit Rate (NRTVR, Non-Real-TimeVariable-Rate) professional and (BE, Best Effort) business of doing one's best.
QoS for the WiMAX system guarantees, U.S. electric and electronics engineers (IEEE, Institute of Electrical and Electronics Engineers) 802.16 agreement specified in more detail division and the QoS framework of system and the concrete Signalling exchange mechanism of service type, lack the implementation method of corresponding congested control.
Summary of the invention
The problem to be solved in the present invention has provided a kind of congestion control method and device that is used for the base station, to solve the problem of having only the QoS framework in the prior art and lacking the implementation method of corresponding congested control.
In order to address the above problem, the embodiment of the invention provides a kind of congestion control method and device that is used for the base station, and concrete technical scheme is as follows:
A kind of congestion control method that is used for the base station comprises:
Congestion state is divided into different grades, sets in advance the congested control model of correspondence for the congestion state of each grade;
Obtain the judgement parameter of congestion state;
Judge the congestion state grade of current period according to the judgement parameter of described congestion state;
Obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement.
A kind of congestion control device that is used for the base station comprises:
Module is set, is used for congestion state is divided into different grades, set in advance the congested control model of correspondence for the congestion state of each grade;
Acquisition module is used to obtain the judgement parameter of congestion state;
Judge module is used for the congestion state grade according to the judgement parameter judgement current period of described congestion state;
Executive Module, the congestion state grade that is used for obtaining according to judgement is carried out the congested control model of described congestion state grade correspondence.
In embodiments of the present invention, by congestion state being divided into different grades, for the congestion state of each grade sets in advance different congested control models; Obtain the judgement parameter of congestion state, judge the congestion state grade of current period according to the judgement parameter of congestion state; Obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement, can solve the problem of having only the QoS framework in the prior art and lacking the implementation method of corresponding congested control, help professional development.
Description of drawings
Fig. 1 is the congestion control method flow chart that is used for the base station that the embodiment of the invention provides;
Fig. 2 is the detail flowchart of the congestion control method that is used for the base station that provides of the embodiment of the invention;
Fig. 3 is the structural representation of the device of the congested control that is used for the base station that provides of the embodiment of the invention.
Embodiment
Core concept of the present invention is: by congestion state being divided into different grades, for the congestion state of each grade sets in advance different congested control models; Obtain the judgement parameter of congestion state, judge the congestion state grade of current period according to the judgement parameter of congestion state; Obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement, can solve the problem of having only the QoS framework in the prior art and lacking the implementation method of corresponding congested control, help professional development.
Below in conjunction with accompanying drawing and preferred implementation technical solution of the present invention is elaborated.
According to the characteristics of WiMAX system, the reason that triggers congested generation can be the interface-free resources of WiMAX system, comprising: the forward direction interface-free resources; Reverse interface-free resources.Based on above-mentioned situation, the WiMAX system is mainly realized the congested control of interface-free resources, it should reach following some requirement: the congested treatment mechanism that interface-free resources is provided; The congested Restoration Mechanism of interface-free resources is provided.Wherein, interface-free resources is band width in physical.
In order to satisfy above-mentioned requirements, one embodiment of the present of invention provide a kind of congestion control method that is used for the base station, as shown in Figure 1, comprising:
101, congestion state is divided into different grades, set in advance the congested control model of correspondence for the congestion state of each grade;
Wherein, the congestion state grade can be divided into no congestion state and congestion state.Wherein congestion state can be divided into slight congestion state, moderate congestion state and severe congestion state.
When the congestion state grade of current period was no congestion state, the congested control model of its correspondence is: whether the last one-period of judging current period had carried out congested processing, if then carry out congested recovery.
When the congestion state grade of current period was slight congestion state, the congested control model of its correspondence was: choose connection, carry out the flow adjustment according to the connection of choosing.
When the congestion state grade of current period is the moderate congestion state, the congested control model of its correspondence is: transship processing, wherein overload is handled one of the following mode that comprises: whole system is transshipped to handle be connected with choosing, transship processing according to the connection of choosing.
When the congestion state grade of current period was the severe congestion state, the congested control model of its correspondence was: choose connection, tear chain open according to the connection of choosing and handle.
Need to prove, the division of above congestion state grade just for convenience, protection scope of the present invention is not limited to this, in actual applications, can segment further the congestion state grade, for example, can be subdivided into one-level moderate congestion state and secondary moderate congestion state for the moderate congestion state, wherein, the Congestion Level SPCC of one-level moderate congestion state is more serious than secondary moderate congestion state, correspondingly, at the congested control model of one-level moderate congestion state correspondence for whole system being transshipped processing; For choosing connection, transship processing at the congested control model of secondary moderate congestion state correspondence according to the connection of choosing.
102, obtain the judgement parameter of congestion state;
Wherein, the judgement parameter of congestion state can be the occupancy of band width in physical and/or the packet loss of real time business.
103, judge the congestion state grade of current period according to the judgement parameter of congestion state;
Particularly, the occupancy of setting band width in physical is P, and the packet loss of real time business is Q, and first thresholding of the occupancy of band width in physical is m1, second thresholding is m2, the 3rd thresholding is m3, and the thresholding of the packet loss of real time business is n, wherein, 0＜m1＜m2＜m3≤1,0＜n＜1,0≤P≤1,0≤Q≤1;
When P＜m1, judge that the congestion state grade of current period is no congestion state;
When 1 〉=P＞m1 or n≤Q, judge that the congestion state grade of current period is a congestion state.
Wherein, when m1≤P＜m2, judge that the congestion state grade of current period is slight congestion state; When m2≤P＜m3, judge that the congestion state grade of current period is the moderate congestion state; When m3≤P or n≤Q, judge that the congestion state grade of current period is the severe congestion state.
104, obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement.
One embodiment of the present of invention provide a kind of congestion control method that is used for the base station, as shown in Figure 2, comprising:
201, the available physical bandwidth in the computing system.
Particularly, frame length, number of subcarriers, symbolic number and up-downgoing symbol ratio according to the WiMAX system calculate every frame band width in physical altogether in the current system, and promptly physics Slot number is designated as Call.The band width in physical that computing cost message on average takies to every frame is designated as Coverhead.Every frame can be used for all band width in physical of media data on the counting statistics meaning, is designated as Cmedia, and its value subtracts the band width in physical that Overhead Message on average takies to every frame, i.e. Cmedia=Call-Coverhead by total band width in physical.
202, the band width in physical of all connections in the computing system is designated as Cuse=∑ Ci, and Ci goes up the average employed band width in physical of every frame that arrives for connecting.
203, the occupancy of Computational Physics bandwidth is designated as P, P=Cuse/Cmedia, 0≤P≤1.
204, the packet loss of real time business in the computing system.
Particularly, calculate average every frame UGS, RTVR and three kinds of business of ERTVR because of overtime bag number that abandons and the bag number that sends altogether, both ratio is the packet loss of real time business, is designated as Q, 0≤Q≤1.
205, start congested control cycle timer.
206, the congestion state grade of judgement current period if there is not congestion state, then carries out 207; If slight congestion state then carries out 208; If the moderate congestion state then carries out 209; If the severe congestion state then carries out 210.
Particularly, first thresholding of setting the occupancy of band width in physical is m1, and second thresholding is m2, and the 3rd thresholding is m3, and the thresholding of packet loss is n, wherein, and 0＜m1＜m2＜m3≤1,0＜n＜1.If P＜m1 judges that then current congestion state grade is no congestion state, carry out 207 this moment; If m1≤P＜m2 judges that then current congestion state grade is slight congestion state, then carries out 208; If m2≤P＜m3 judges that then current congestion state grade is the moderate congestion state, then carries out 209; If m3≤P or n≤Q judge that then current congestion state grade is the severe congestion state, then carries out 210.
207, judge whether the last one-period of current period has carried out congested processing, if carried out congested processing, then carry out congested recovery, and change 211 over to.
Wherein, congested processing can be that the chain processing is handled or torn open to flow adjustment, overload.
208, choose connection, carry out the flow adjustment according to the connection of choosing, carry out 211 then.
Particularly, at first choose connection from low to high, promptly choose the low connection of User Priority earlier, choose the high connection of User Priority again according to User Priority.Wherein, User Priority can be provided with according to actual needs, and for example, VIP user's priority is higher than the priority of domestic consumer.
If User Priority is identical, then choose connection from low to high according to service priority, promptly choose the low connection of service priority earlier, choose the high connection of service priority again, for example, in the WiMAX business, service priority professional in 5 is followed successively by BE business, NRTVR business, ERTVR business, RTVR business and UGS business from low to high.
If service priority is identical, then choose connection from low to high according to rank, modulation coding mode position, it is the low connection of first choice of modulation coded system, the high connection of choice of modulation coded system again, for example, the rank, position of 64 times of quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) mode are higher than 16 times of QAM modes, the rank, position of 16 times of QAM modes are higher than Quadrature Phase Shift Keying modulation (QPSK, Quadrature Phase Shift Keying) mode.
If modulation coding mode is identical, then picked at random connects.
Wherein, the flow adjustment comprises one of following mode: the power that initiatively promotes the user of the connection correspondence of choosing, improve the user's of user's the modulation coding mode of the connection correspondence choose and the connection correspondence that reduction is chosen repeated encoding number of times by Adaptive Modulation and Coding (AMC, Adaptive Modulation Coding).
209, transship processing, carry out 211 then.
Particularly, overload is handled one of the following mode that comprises: whole system is transshipped to handle be connected with choosing, transship processing according to the connection of choosing.
Wherein, whole system is transshipped to handle comprise one of following mode: forbid that new user inserts; Forbid that reserved service flow activates; Forbid dynamically increasing the minimum reserved rate configuration of admission service stream, for example for the UGS business, minimum reserved rate is configured to 120kbps; Forbidding that near in the scope of this base station the user adopts the more modulation coding mode of low order; Forbid that new user switches to this base station; The user's that enforced opening satisfies condition multi-aerial space multiplexing function.
Transship to handle and comprise one of following mode: notify the user to initiate scanning, and choose the user according to scanning result and force to switch to other base stations; The user of the connection correspondence that pressure is chosen enter the free time (Idle) or the sleep (Sleep) state; The user of the connection correspondence that pressure is chosen carries out the QoS degradation and handles; The user of the connection correspondence that pressure is chosen carries out packet loss and handles.
Wherein, the content of choosing connection can not repeat them here referring to 208 corresponding contents.
210, choose connection, to tear chain open according to the connection of choosing and handle, i.e. the mandatory dismantling connection of having set up carries out 211 then.
Wherein, the content of choosing connection can not repeat them here referring to 208 appropriate section.Tear the chain processing open and be meant that choosing a connection removes at every turn, discharge related resource.
211, wait for the congested control that triggers following one-period.
Based on the inventive concept identical with method, the embodiment of the invention also provides a kind of congestion control device that is used for the base station, as shown in Figure 3, comprising:
Module is set, is used for congestion state is divided into different grades, for the congestion state of each grade sets in advance different congested control models;
Acquisition module is used to obtain the judgement parameter of congestion state;
Judge module is used for the congestion state grade according to the judgement parameter judgement current period of congestion state;
Executive Module, the congestion state grade that is used for obtaining according to judgement is carried out the congested control model of described congestion state grade correspondence.
Wherein, the congestion state that Module Division is set comprises: no congestion state, slight congestion state, moderate congestion state and severe congestion state.
Wherein, the judgement parameter of described congestion state comprises the occupancy of band width in physical and/or the packet loss of real time business,
Correspondingly, this judge module, the occupancy that specifically is used to set band width in physical is P, the packet loss of real time business is Q, first thresholding of the occupancy of band width in physical is m1, and the thresholding of the packet loss of real time business is n, wherein, and 0＜m1＜1,0＜n＜1,0≤P≤1,0≤Q≤1;
When P＜m1, judge that the congestion state grade of current period is no congestion state;
When 1 〉=P＞m1 or n≤Q, judge that the congestion state grade of current period is a congestion state.
In the congestion state grade of current period during for no congestion state, Executive Module is used to specifically judge whether the last one-period of current period carried out congested processing, if then carry out congested recovery.
Wherein, judge module, second thresholding that specifically is used to set the occupancy of band width in physical is m2, the 3rd thresholding is m3, wherein, 0＜m1＜m2＜m3≤1;
When m1≤P＜m2, judge that the congestion state grade of current period is slight congestion state;
When m2≤P＜m3, judge that the congestion state grade of current period is the moderate congestion state;
When m3≤P or n≤Q, judge that the congestion state grade of current period is the severe congestion state.
Further, when the congestion state grade of current period was light congestion state, this Executive Module specifically was used to choose connection, carries out the flow adjustment according to the connection of choosing, and this flow adjustment comprises one of following mode:
Initiatively promote the user's of the connection correspondence of choosing power, improve the user's of the connection correspondence of choosing modulation coding mode and the repeated encoding number of times that reduces the user who is connected correspondence who chooses.
Further, when the congestion state grade of current period was the moderate congestion state, this Executive Module specifically was used for whole system is transshipped processing; Or choose connection, transship processing according to the connection of choosing;
Wherein, whole system is transshipped to handle comprise one of following mode: forbid that new user inserts; Forbid that reserved service flow activates; Forbid dynamically increasing the minimum reserved rate configuration of admission service stream; Forbidding that near in the scope of this base station the user adopts the more modulation coding mode of low order; Forbid that new user switches to this base station; The user's that enforced opening satisfies condition multi-aerial space multiplexing function;
Choose and connect one of the following mode that comprises of handling of transshipping: the user of the connection correspondence that notice is chosen initiates scanning, and chooses the user according to scanning result and force it to switch to other base stations; The user of the connection correspondence that pressure is chosen enters free time or sleep state; The user of the connection correspondence that pressure is chosen carries out the service quality degradation and handles; The user of the connection correspondence that pressure is chosen carries out packet loss and handles.
Further, when the congestion state grade of current period was the severe congestion state, this Executive Module specifically was used to choose connection, tore chain open according to the connection of choosing and handled.
Wherein, Executive Module can adopt following method to choose connection
At first choose connection according to User Priority order from low to high; If User Priority is identical, then choose connection according to service priority order from low to high; If service priority is identical, then choose connection according to rank, the position order from low to high of modulation coding mode; If modulation coding mode is identical, then picked at random connects.
In embodiments of the present invention, by congestion state being divided into different grades, for the congestion state of each grade sets in advance different congested control models; Obtain the judgement parameter of congestion state, judge the congestion state grade of current period according to the judgement parameter of congestion state; Obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement, can solve in the prior art, have only the QoS framework and lack the problem of the implementation method of corresponding congested control, help professional development.In addition, carry out congested control, improved becoming more meticulous of congested control according to User Priority, service priority and modulation coding mode.
Should be understood that above-mentioned at concrete enforcement describe more detailed, can not think the restriction of the protection range of patent of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (12)
1. a congestion control method that is used for the base station is characterized in that, comprising:
Congestion state is divided into different grades, sets in advance the congested control model of correspondence for the congestion state of each grade;
Obtain the judgement parameter of congestion state;
Judge the congestion state grade of current period according to the judgement parameter of described congestion state;
Obtain the congested control model that the congestion state grade is carried out described congestion state grade correspondence according to judgement.
2. the congestion control method that is used for the base station as claimed in claim 1 is characterized in that, described congested state of a control comprises: no congestion state, slight congestion state, moderate congestion state and severe congestion state.
3. the congestion control method that is used for the base station as claimed in claim 2 is characterized in that, the judgement parameter of described congestion state comprises: the occupancy of band width in physical and/or the packet loss of real time business.
4. as claim 2 or the 3 described congestion control method that are used for the base station, it is characterized in that described judgement parameter according to described congestion state is judged the congestion state grade of current period, comprising:
The occupancy of setting band width in physical is P, and the packet loss of real time business is Q, the first thresholding m1 of the occupancy of band width in physical, the second thresholding m2, the 3rd thresholding m3, the thresholding of the packet loss of real time business are n, wherein 0＜m1＜m2＜m3≤1,0＜n＜1,0≤P≤1,0≤Q≤1;
When P＜m1, judge that the congestion state grade of current period is no congestion state;
When m1≤P＜m2, judge that the congestion state grade of current period is slight congestion state;
When m2≤P＜m3, judge that the congestion state grade of current period is the moderate congestion state;
When m3≤P or n≤Q, judge that the congestion state grade of current period is the severe congestion state.
5. the congestion control method that is used for the base station as claimed in claim 4, it is characterized in that, when the congestion state grade of described current period during, describedly obtain the congestion state grade according to judgement and carry out the step of the congested control model of described congestion state grade correspondence and comprise for no congestion state:
Judge whether the last one-period of current period carried out congested processing, if then carry out congested recovery.
6. the congestion control method that is used for the base station as claimed in claim 4, it is characterized in that, when the congestion state grade of described current period is slight congestion state, describedly obtains the congestion state grade according to judgement and carry out the step of the congested control model of described congestion state grade correspondence and comprise:
Choose connection, carry out the flow adjustment according to the described connection of choosing, described flow adjustment comprises one of following mode:
Initiatively promote the user's of the described connection correspondence of choosing power, improve the user's of the described connection correspondence of choosing modulation coding mode and the repeated encoding number of times that reduces the described user who is connected correspondence who chooses.
7. the congestion control method that is used for the base station as claimed in claim 4, it is characterized in that, when the congestion state grade of described current period is the moderate congestion state, describedly obtains the congestion state grade according to judgement and carry out the step of the congested control model of described congestion state grade correspondence and comprise:
Whole system is transshipped processing; Or
Choose connection, transship processing according to the described connection of choosing;
Wherein, described whole system is transshipped to handle comprise one of following mode: forbid that new user inserts; Forbid that reserved service flow activates; Forbid dynamically increasing the minimum reserved rate configuration of admission service stream; Forbidding that near in the scope of this base station the user adopts the more modulation coding mode of low order; Forbid that new user switches to this base station; The user's that enforced opening satisfies condition multi-aerial space multiplexing function;
Described transship to handle according to the described connection of choosing comprise one of following mode: notify the user of the described connection correspondence of choosing to initiate scanning, and choose the user according to scanning result and force it to switch to other base stations; Force the user of the described connection correspondence of choosing to enter free time or sleep state; Force the user of the described connection correspondence of choosing to carry out the processing of service quality degradation; Force the user of the described connection correspondence of choosing to carry out the packet loss processing.
8. the congestion control method that is used for the base station as claimed in claim 4, it is characterized in that, when the congestion state grade of described current period is the severe congestion state, describedly obtains the congestion state grade according to judgement and carry out the step of the congested control model of described congestion state grade correspondence and comprise:
Choose connection, tear chain open according to the described connection of choosing and handle.
9. as any described congestion control method that is used for the base station of claim 6-8, it is characterized in that the described step of connecting of choosing is:
Choose connection according to User Priority order from low to high; If described User Priority is identical, then choose connection according to service priority order from low to high; If described service priority is identical, then choose connection according to rank, the position order from low to high of modulation coding mode; If described modulation coding mode is identical, then picked at random connects.
10. a congestion control device that is used for the base station is characterized in that, comprising:
Module is set, is used for congestion state is divided into different grades, set in advance the congested control model of correspondence for the congestion state of each grade;
Acquisition module is used to obtain the judgement parameter of congestion state;
Judge module is used for the congestion state grade according to the judgement parameter judgement current period of described congestion state;
Executive Module, the congestion state grade that is used for obtaining according to judgement is carried out the congested control model of described congestion state grade correspondence.
11. the congestion control device that is used for the base station as claimed in claim 10 is characterized in that, the described congestion state that Module Division is set comprises: no congestion state, slight congestion state, moderate congestion state and severe congestion state.
12. the congestion control device that is used for the base station as claimed in claim 11 is characterized in that, the judgement parameter of the congestion state that described acquisition module obtains comprises: the occupancy of band width in physical and/or the packet loss of real time business.
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| CN103399789A (en) * | 2013-08-09 | 2013-11-20 | 香港应用科技研究院有限公司 | Dynamic overload control method capable of being constructed in distributed-type stream computing system |
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