CN1281014C - Multiple carrier load balancing method - Google Patents
Multiple carrier load balancing method Download PDFInfo
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- CN1281014C CN1281014C CNB02136172XA CN02136172A CN1281014C CN 1281014 C CN1281014 C CN 1281014C CN B02136172X A CNB02136172X A CN B02136172XA CN 02136172 A CN02136172 A CN 02136172A CN 1281014 C CN1281014 C CN 1281014C
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- travelling carriage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention relates to a multiple carrier load balancing method which is suitable for a CDMA mobile communication system of the multiple carrier. The method comprises that after a new call is added, whether each carrier is overloaded or not is judged according to the current power value of each carrier and Walsh code (Walsh) channel resource numbers; the difference between the maximum value and the minimum value of the power in non-overload carrier and the difference between the maximum value and the minimum value of the Walsh channel resource are calculated, the difference is compared with power threshold and Walsh channel resource threshold, and the new call is allocated to different carrier according to different comparative result. The power proportional control among the carrier and the proportional control of user numbers among the carrier in the prior art are comprehensively considered by the present invention, a plurality of obtained carrier power load deviation and load deviation of user numbers are smaller, and favorable balancing effect is guaranteed. By simulation verification, the present invention can guarantee favorable balancing effect, and simultaneously, assigned times of the carrier are greatly reduced. The present invention is superior to the existing method.
Description
Technical field
The present invention relates to wireless telecommunication system, specifically, relate to the method for each carrier load of MC-CDMA wireless telecommunication system balance.
Background technology
Code division multiple access (CDMA) is mobile communication a kind of multiple access modulation technique commonly used.After the cdma system of a single carrier reaches its capacity limitation, need to use a plurality of carrier waves to increase the capacity of system, can support a plurality of communication links on each carrier wave.Fig. 1 has provided the CDMA Cellular System structure chart of typical two carrier waves, and diagram is the states of two carrier waves of 3 adjacent base stations when reaching the loads ideal balance, is that load balancing techniques is striven the target that reaches.Among the figure, dotted line is represented the coverage of carrier wave f1, and solid line is represented the coverage of carrier wave f2.After travelling carriage inserts successfully, need apply for resource to the base station, the base station is a travelling carriage assignment carrier frequency according to the carrier assignments method, or allows travelling carriage to use default access carrier, or assigns another carrier frequency to give travelling carriage.In the system shown in Figure 1, the carrier wave f1 of mobile station MS 1 access base station BS1, mobile station MS 2 are in the coverage of the carrier wave f2 of base station BS 1 and BS2, and promptly in the soft handover area of carrier wave f2, a certain moment can all be related with two base stations.Show that by diagram load balance is that the base station cooperates with travelling carriage and finishes.
The N that the capacity of a N carrier wave cdma system is at least single-carrier system doubly, if having suitable balancing method of loads, multicarrier system can reach heap(ed) capacity under the air interface restriction; A kind of good carrier assignments method not only can improve power system capacity simultaneously, the balance that all right alleviate congestion, maintenance cover, thereby the overall performance of raising system.
At first, load balance helps to improve the junction efficiency of a plurality of carrier waves, and then improves power system capacity.With one two carrier system is example, if carrier assignments imbalance, suppose that promptly carrier wave 1 is near fully loaded, and the load of carrier wave 2 is lighter, require access carrier 1 after new calling arrives, if agree its access, then carrier wave 1 will reach fully loaded, do not have enough power to admit new user again, a part requires the user of power ascension probably owing to there not being unnecessary power to cause the generation of call drop in the system; And carrier wave 2 has remaining power to make full use of, and this capacity to system will have infringement.To normally withdraw from, switching, call drop etc., user's resource discharges also needs certain hour, therefore, when carrier wave 1 near full load, it discharges enough power and needs a period of time for active user and the use of Xin Jia access customer, at this moment, will cause the congested of carrier wave 1 if there is new user to arrive.If make relatively balance of a plurality of carrier loads, reduce in this case to the assignment of carrier wave 1, assign to the lighter carrier wave of load with newly adding access customer, then can effectively alleviate produce on the carrier wave 1 congested.This congested of two carrier waves control can make power system capacity keep maximum as far as possible in dynamic change, improves junction efficiency effectively in good time.
Secondly, load balance can make the scope maintenance balance that multicarrier covers.Be that example describes with two carrier waves still, the carrier wave 1 of establishing several neighbor cells is heavy duty, and carrier wave 2 is a underloading.Like this, naturally the coverage that is carrier wave 1 reduces, and the coverage of carrier wave 2 increases, the problem of bringing thus is that the Zone switched of carrier wave 1 reduces, originally need the user of switching to carry out soft handover now, therefore cause signal to noise ratio that the call drop possibility is increased, the access performance of simultaneity factor also can variation.In addition,, can cause many sub-districts neighboring region too much pilot tone can occur, cause pilot pollution, increase and disturb, reduce the demodulation performance of call completing rate and reception because the coverage of carrier wave 2 increases.
This shows,, must carry out load balance a plurality of carrier waves for multi-carrier CDMA system.The reasonably network planning is a kind of necessary means that guarantees carrier balance.But because the access at random of load causes professional dynamic change, the network planning can not guarantee fully that multicarrier system can both keep the balance of load at any time, and this takes necessary method to guarantee the balance of system load with regard to requiring.
Balancing method of loads at present commonly used is a travelling carriage according to breathing out assorted (Hash) algorithm carrier wave of picked at random between a plurality of carrier waves, the choosing of Access Channel Slot in the similar IS-95 standard, and multiple carrier load balancing is guaranteed by hash algorithm.Though this method can provide the load balance of long-term whole system level, but because each travelling carriage is fixed by the carrier number that hash algorithm produces, use the number of these labels also uneven in each sub-district, like this, the carrier number that most of travelling carriage in a certain certain base station area of coverage is provided by hash algorithm may be same, causes the laod unbalance on the different carrier in this sub-district.Therefore in base station side, need find more accurate resource allocation method to be adjusted.At present common method mainly contains two kinds, and a kind of is according to the walsh code of usefulness (Walsh) channel number on the more a plurality of carrier waves of minimal chain way principle, will newly call out assignment and give and used the minimum carrier wave of Walsh channel number; Another kind is a minimum power expense method, and this method is to estimate each carrier wave institute wasted work rate by the base station, and compares, and selects the carrier assignments that takies the power minimum and uses for new the calling.Above-mentioned two kinds of methods that method all is an absolute equilibrium.
Because these two kinds of methods are simple, the relevant paper of research load balance has all carried out certain research to these two kinds of methods.The paper of Motorola " Estimate of Multicarrier CDMA System Capacity " has carried out capacity emulation to method and the minimum power expense method of using minimal chain way principle to carry out the intercarrier load balance, provided the improved result of overall system capacity, pointed out that simultaneously minimum power expense method is better than smallest link counting method on volumetric properties.
Counterbalance effect to two kinds of absolute equilibrium methods in the paper of Lang Xun " Performance Comparison of Load Balancing Methods in MultipleCarrier CDMA Systems " has carried out emulation testing, and test result shows that the counterbalance effect of two kinds of methods is more approaching.Point out in the paper, in order to reach accurate load balance, must control accurately at base station side working load balance method, also illustrate simultaneously in order to reach desirable control, the balancing method of loads use that should combine with hash algorithm, balance by a plurality of carrier loads in the balance method bonding sub-district increase guarantees that by hash algorithm a large number of users evenly distributes in the area group on a plurality of carrier index, promptly carry out local and whole control simultaneously.
In addition, also has some other balancing method of loads, come assignment newly to call out as growth according to the reverse link received signal to noise ratio, assignment is newly called out between each carrier wave successively, perhaps come distributing carrier wave according to the size of each travelling carriage path loss, but these methods are because counterbalance effect is bad, and perhaps the complexity of Shi Xianing too greatly and can't practical application.
The method that discuss the front all is the method for some load absolute equilibriums, in the middle of practical application, can cause striding in a large number the situation of carrier frequency assignment resource.In general, two carrier frequency of which kind of situation no matter, its performance all can descend a lot than single carrier frequency, and when particularly two carrier frequency all dispose control channel, its call successful rate will obviously descend, nearly 4 to 5 percentage points.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of multiple carrier load balancing method, can reduce the number of times of striding the carrier frequency resource assignment.
Multiple carrier load balancing method of the present invention may further comprise the steps:
One, overloaded base stations control module performance number and walsh code (Walsh) the channel resource number current according to each carrier wave, judge successively whether each carrier wave transships after new calling adds, and the carrier wave of power and the equal nonoverload of Walsh channel resource is offered the load balance module use of base station;
Two, the maximum of calculating power in the carrier wave of the nonoverload that is obtained by step 1 and minimum value is poor, with difference and power threshold comparison, if difference, then will newly be called out assignment greater than power threshold to the carrier wave that takies the power minimum, method ends; If difference is less than power threshold, then execution in step three;
Three, calculate the poor of the maximum of used Walsh channel resource in the carrier wave of nonoverload and minimum value, and compare with Walsh channel resource thresholding, if difference, then will newly be called out assignment greater than Walsh channel resource thresholding and be given the minimum carrier wave of used Walsh channel resource, method ends; If difference is less than Walsh channel resource thresholding, then execution in step four;
Four, do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, the new calling given in assignment.
Multiple carrier load balancing method of the present invention, take all factors into consideration minimum power expense method to the control of the control of intercarrier power equalization and smallest link counting method to the equilibrium of intercarrier number of users, resulting a plurality of carrier power load deviation and number of users load deviation all compare less, have guaranteed good counterbalance effect.Simultaneously, introduced two thresholdings in the method, suitably adjusted thresholding, promptly be equivalent to shrink and relax the assignment condition, can adjust the assignment frequency thus as the assignment condition.By simulating, verifying, the present invention can reduce the assignment number of times of carrier wave greatly when guaranteeing well balanced effect, be better than existing method.In a word, the present invention has guaranteed counterbalance effect when keeping the existing simple characteristics of conventional method, reduced the carrier frequency assignment number of times of base station side, and stronger practicality is arranged.
Description of drawings
Fig. 1 is two carrier wave cdma cellular mobile communcations system structure charts under the desirable balance state.
Fig. 2 is that cdma base station transships the control and the schematic diagram of load balance.
Fig. 3 is the flow chart of multiple carrier load balancing method of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 introduced in front in detail, repeated no more herein.
Fig. 2 has provided when new calling arrives, the process that control and load balance are transshipped in the base station.After travelling carriage inserted successfully, to the base station requests resource, call processing module access carrier that travelling carriage is default number was sent into and to be transshipped judgement in the overload control module.After adding travelling carriage, if system overload, just refusal is called out; If system's nonoverload just enters the load balance module.The load balance module for the travelling carriage that adds generates a carrier index, then, is travelling carriage assignment carrier wave and Resources allocation according to balancing method of loads.At last, send the resource of distributing to call processing module by interface, by air interface assignation information is sent to travelling carriage again, travelling carriage carries out subsequent treatment under the carrier wave of assignment.
Fig. 3 is the detail flowchart of balancing method of loads of the present invention, comprises two major parts: overload control and load balance.Load balance usually all combines with overload control, after new calling arrives, will judge that at first this new calling adds the current system in back and whether transships, and then carry out load balance.When transshipping control, at first to all carrier wave traversals, calculate the current number of users of each carrier wave, power and Walsh channel resource number, judge when new call out adding after the power of each carrier wave whether transship, the carrier wave of the power nonoverload carrier wave with overload is separated; To the carrier wave traversal of power nonoverload, judge whether the new Walsh channel resource number that adds the back carrier wave of calling out transships then.At last, keep above-mentioned two kinds of resources all the carrier wave of nonoverload carry out load balance.When not having the carrier wave of nonoverload, system's refusal is called out; When the carrier wave of nonoverload has only one, unconditionally will newly call out on the carrier wave that assigns to nonoverload.
In the load balance stage, introduce two thresholdings the laod unbalance degree of nonoverload carrier wave is weighed, therefrom choose a underloading carrier assignments and give travelling carriage, so that can reach the purpose of balance.After receiving the carrier set of nonoverload, choose the maximum MaxP and the minimum M inP of carrier power, and calculate their difference, difference and power threshold P
TCompare, if difference is greater than power threshold P
T, then search carrier index, and give travelling carriage its assignment corresponding to power minimum MinP; If difference is smaller or equal to power threshold P
T, then continue to choose each and do not transship the maximum MaxN and the minimum M inN of the used Walsh channel resource of carrier wave number, calculate their difference, again with difference and Walsh channel resource thresholding N
TCompare, if difference is greater than N
T, travelling carriage is given in the carrier index assignment that just will take Walsh channel resource minimum number; Otherwise, observe carrier index that travelling carriage reports and whether do not transshipping in the carrier wave, if the carrier number that travelling carriage reports just keeps this numbering assignment and gives travelling carriage not transshipping among the carrier wave; If the carrier number that travelling carriage reports is not being transshipped in the carrier wave, then do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, travelling carriage is given in assignment.
Power threshold P
TIndicated the uneven horizontal degree of power termination on a plurality of carrier waves, this value is big more, and this method is poor more to the counterbalance effect of power termination on the multicarrier, and the corresponding carrier assignments number of times of striding is few more, and the balancing method of loads role is just more little; This value is more little, and balancing method of loads is good more to the counterbalance effect of power termination on the multicarrier, strides the carrier assignments number of times accordingly this moment and also can increase, and the balance method effect is bigger.Walsh channel resource thresholding N
TIndicated the uneven degree of number of users on the multicarrier, this value is big more, and balancing method of loads is poor more for the counterbalance effect of intercarrier number of users, and striding the carrier assignments number of times accordingly then can be few more; Otherwise the effect of balance method is just big more, and it is just many more to stride the carrier assignments number of times.Therefore in actual applications, choose threshold value and need take all factors into consideration counterbalance effect and stride the carrier assignments number of times, threshold value can not be chosen too greatly, if too big, can cause the counterbalance effect that can't reach good, that is to say that balancing method of loads can lose efficacy; But can not obtain too smallly, though can guarantee counterbalance effect because thresholding dwindles, it is too frequent to cause striding the carrier assignments number of times.If power threshold P
TEqual 0, then be equivalent to the method for independent power termination absolute equilibrium, can make Walsh channel resource thresholding N
TInefficacy is set.Therefore, suggestion power threshold P
TWith Walsh channel resource thresholding N
TSpan as follows: 0 (milliwatt)＜P
T＜=3500 (milliwatts), P
TBe integer; 0＜N
T＜=5 (individual), N
TBe integer.
Claims (9)
1, a kind of multiple carrier load balancing method is characterized in that, may further comprise the steps:
One, overloaded base stations control module performance number and the walsh code Walsh channel resource number current according to each carrier wave, judge successively whether each carrier wave transships after new calling adds, and the carrier wave of power and the equal nonoverload of Walsh channel resource is offered the load balance module use of base station;
Two, the maximum of calculating power in the carrier wave of the nonoverload that is obtained by step 1 and minimum value is poor, with difference and power threshold comparison, if difference, then will newly be called out assignment greater than power threshold to the carrier wave that takies the power minimum, method ends; If difference is less than power threshold, then execution in step three;
Three, calculate the poor of the maximum of used Walsh channel resource in the carrier wave of nonoverload and minimum value, and compare with Walsh channel resource thresholding, if difference, then will newly be called out assignment greater than Walsh channel resource thresholding and be given the minimum carrier wave of used Walsh channel resource, method ends; If difference is less than Walsh channel resource thresholding, then execution in step four;
Four, do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, the new calling given in assignment.
2, multiple carrier load balancing method according to claim 1 is characterized in that, described step 1 further comprises: 1) to all carrier wave traversals, calculate the current number of users of each carrier wave, power and Walsh channel resource number; 2) judge when new call out adding after the power of each carrier wave whether transship, the carrier wave of the power nonoverload carrier wave with overload is separated; 3) carrier wave to the power nonoverload travels through, and judges whether the new Walsh channel resource number that adds the back carrier wave of calling out transships; 4) keep all carrier waves of nonoverload of above-mentioned two kinds of resources, judge whether the carrier number of nonoverload is 0, if be 0, then system's refusal is called out; Otherwise, judge whether the carrier number of nonoverload is 1, if be 1, then unconditionally will newly call out the carrier wave that this nonoverload is given in assignment; Otherwise, execution in step two.
3, multiple carrier load balancing method according to claim 1 and 2 is characterized in that, the power threshold P in the described step 2
TSpan: 0 milliwatt＜P
T＜=3500 milliwatts, P
TBe integer.
4, multiple carrier load balancing method according to claim 1 and 2 is characterized in that, the Walsh channel resource thresholding N in the described step 3
TSpan: 0＜N
T＜=5, N
TBe integer.
5, multiple carrier load balancing method according to claim 3 is characterized in that, the Walsh channel resource thresholding N in the described step 3
TSpan: 0＜N
T＜=5, N
TBe integer.
6, multiple carrier load balancing method according to claim 1 and 2, it is characterized in that, described step 4 also can be: judge that whether carrier index that travelling carriage reports do not transshipping in the carrier wave, if the carrier number that travelling carriage reports is not being transshipped among the carrier wave, just keep this numbering assignment and give travelling carriage; If the carrier number that travelling carriage reports is not being transshipped in the carrier wave, then do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, travelling carriage is given in assignment.
7, multiple carrier load balancing method according to claim 3, it is characterized in that, described step 4 also can be: judge that whether carrier index that travelling carriage reports do not transshipping in the carrier wave, if the carrier number that travelling carriage reports is not being transshipped among the carrier wave, just keep this numbering assignment and give travelling carriage; If the carrier number that travelling carriage reports is not being transshipped in the carrier wave, then do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, travelling carriage is given in assignment.
8, multiple carrier load balancing method according to claim 4, it is characterized in that, described step 4 also can be: judge that whether carrier index that travelling carriage reports do not transshipping in the carrier wave, if the carrier number that travelling carriage reports is not being transshipped among the carrier wave, just keep this numbering assignment and give travelling carriage; If the carrier number that travelling carriage reports is not being transshipped in the carrier wave, then do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, travelling carriage is given in assignment.
9, multiple carrier load balancing method according to claim 5, it is characterized in that, described step 4 also can be: judge that whether carrier index that travelling carriage reports do not transshipping in the carrier wave, if the carrier number that travelling carriage reports is not being transshipped among the carrier wave, just keep this numbering assignment and give travelling carriage; If the carrier number that travelling carriage reports is not being transshipped in the carrier wave, then do not transshipping numbering of picked at random in the carrier wave according to hash algorithm, travelling carriage is given in assignment.
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| CNB02136172XA CN1281014C (en) | 2002-07-20 | 2002-07-20 | Multiple carrier load balancing method |
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| CNB02136172XA CN1281014C (en) | 2002-07-20 | 2002-07-20 | Multiple carrier load balancing method |
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| CN1469570A CN1469570A (en) | 2004-01-21 |
| CN1281014C true CN1281014C (en) | 2006-10-18 |
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| CNB02136172XA Expired - Fee Related CN1281014C (en) | 2002-07-20 | 2002-07-20 | Multiple carrier load balancing method |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100421480C (en) * | 2004-12-01 | 2008-09-24 | 华为技术有限公司 | Base station multiple carrier resource managing method |
| CN101110659B (en) * | 2006-07-17 | 2011-12-07 | 华为技术有限公司 | Method for distributing subdistrict frequency band and network appliance thereof |
| CN101742563B (en) * | 2008-11-07 | 2012-12-19 | 电信科学技术研究院 | Method, device and system for realizing carrier load balance |
| WO2010069153A1 (en) * | 2008-12-19 | 2010-06-24 | 大唐移动通信设备有限公司 | Resources and load controlling method, system, apparatus, base station and terminal |
| CN101873636B (en) * | 2009-04-24 | 2015-06-03 | 中兴通讯股份有限公司 | Multi-carrier selection preprocessing method based on multi-carrier system |
| CN101883397B (en) * | 2009-05-08 | 2014-11-05 | 电信科学技术研究院 | Load control method, system and device |
| CN102036407A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Method and system of realizing random access |
| CN102076089B (en) * | 2009-11-23 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for allocating carrier resources to user equipment (UE) |
| CN101742566B (en) * | 2009-12-08 | 2012-07-25 | 中国科学院声学研究所 | Channel bank-based bandwidth allocation method |
| CN101778411B (en) * | 2010-01-07 | 2012-10-31 | 中讯邮电咨询设计院有限公司 | Processing method and system for CDMA (Code Division Multiple Access) 1X voice and data service wireless resource |
| CN102111813B (en) * | 2010-03-22 | 2013-09-25 | 电信科学技术研究院 | Method and equipment for balancing loads of carriers |
| CN102264141A (en) * | 2010-05-25 | 2011-11-30 | 华为技术有限公司 | Method, device and system for processing multi carrier |
| CN101854659A (en) * | 2010-06-04 | 2010-10-06 | 中兴通讯股份有限公司 | Method and base station for controlling forward transmitting power overload |
| CN101873709B (en) | 2010-06-30 | 2013-06-26 | 华为技术有限公司 | Method, equipment and system for assigned calling |
| WO2013026184A1 (en) * | 2011-08-24 | 2013-02-28 | Renesas Mobile Corporation | Apparatus and method for random access channel resource selection |
| CN103747488B (en) * | 2014-01-28 | 2017-02-22 | 大唐移动通信设备有限公司 | carrier balancing method, device and system |
| CN111277974B (en) | 2017-09-15 | 2023-11-21 | Oppo广东移动通信有限公司 | Carrier selection method and communication equipment |
| EP3687235A1 (en) * | 2019-01-23 | 2020-07-29 | Shenzhen Goodix Technology Co., Ltd. | Extended battery lifetime for nb-iot devices via coverage class specific paging |
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