CN102695209A - Load balancing method for different coverage scenes and base station - Google Patents
Load balancing method for different coverage scenes and base station Download PDFInfo
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Abstract
The invention provides a load balancing method for different coverage scenes and a base station. The method is a mobile load balancing method used for different access networks and different coverage scenes. The method comprises the following steps of: judging a type of a coverage scene; if the coverage scene is an overlap and hierarchical scene, preferentially adopting a step of adjusting carrier wave priority, and if the coverage scene is a neighborhood scene, using a switching method to transfer a part of users in an overlap overload cell to a light load cell. The step of judging the type of the coverage scene further comprises that: UE measures reference signals of different base stations; signal intensity and system parameters of the base stations are extracted; coverage of different base stations is calculated, and coverage types between different base stations are judged. The step of adjusting the carrier wave priority further comprises that: a carrier wave priority parameter of the UE is adjusted; and the UE accesses a high priority RAT. According to the method, adopting a most suitable load balancing method in different coverage scenes is realized.
Description
Technical field
The present invention relates to the RRM field, be specifically related to a kind of method and base station to load balancing under the different covering scene.
Background technology
Along with the wireless access the Internet with based on the expanded demand of Internet service, through strengthening the user experience of access is moved in effective broadband, we just can move run in competitive superiority.A method very likely is exactly to improve the performance of whole system to greatest extent, that is to say the wireless access performance that not only provides higher, also has more effective operation and maintenance.
Self-organizing network is to improve an operation and a key factor of safeguarding in the long-term process of 3GPP.Its main target is effectively to reduce operating costs, improves the network coverage, resource utilization and service quality.Just as each mobile network, LTE (long-term evolution process) system also needs management.Yet the complexity of LTE network self must cause its operation and maintenance for network that new requirement is arranged: self-organizing network (SON) will be opened up a new path for operators on the problem of effectively paring down expenses.SON has listed in the 3GPP standard now.
Self-organizing and self-optimizing technology constantly increase problem to the expense and the complexity of the Disposition & Operation of 4G cordless communication network related installation, maintenance and optimization network node; Carry out concrete research, research contents comprises from mounting technique, self-configuring technology, self-optimizing is technological and four aspects such as self-healing technology.
To carrying out self-optimizing with the internetwork mobile phase related parameter of LTE in the relevant LTE network of the load of current area and adjacent cell, compare power system capacity with the static parameter optimization system and be optimized.This optimization can reduce the participation of people aspect network management and optimization equally.
At present, the method for realization moving load balanced (MLB) mainly contains the adjustment of handoff parameter and the priority setting between the different carrier.The adjustment of handoff parameter mainly is the switching scope (HO boundary) that influences the sub-district, and the priority that different carrier is set can influence the gravity treatment zone (cell reselection boundary) of sub-district.Under different Inter-RATs scenes, the dominance relation of these two kinds of methods is different.
Different with intra-LTE, Inter-RATs mainly contains without the coverage condition more complicated between the sub-district: overlapping coverage, hierarchical coverage, neighboring coverage etc.Realize that MLB mainly through the adjustment handoff parameter, is that the HO boundary of sub-district changes, thereby the user of cell edge is adjusted to the underloading sub-district.The setting of different carrier priority also can have influence on MLB, and different carrier wave priority promptly means different cell reselection boundary.Can know with [2] that according to TS36.304 when LTE and the overlapping covering of UMTS, if the priority of LTE is higher than UMTS, this moment, only marginate user can switch to UMTS.When LTE transshipped, we can turn down the priority of LTE, were that the user at center can switch to UMTS.
Here we are be divided into two types of Inter-RATs: 1, and overlapping coverage and hierarchical coverage; 2, neighboring coverage.To these two kinds of condition of different, we study the relation between the MLB method.
Understand for convenient, list the Chinese and English contrast of some terms that occur among the present invention below:
SON:Self-Organizing Network, self-organizing network
ENB:Evolved Node B, the base station of LTE the inside
UE:User Equipment, subscriber equipment
MLB:Mobility Load Balancing, moving load is balanced
LTE:Long Term Evolution, Long Term Evolution
RAT:Radio Access Technology, wireless access technology
UMTS:Universal Mobile Telecommunication System, UMTS
HO:Handover switches
CRS:Cell reselection boundary, the district reselecting border
Summary of the invention
The objective of the invention is to; The network performance that distributes inequality to cause because of the user is low, user experience quality is bad in order to overcome; Provide a kind of under different Access Networks (Inter-RATs) situation; Based on the load-balancing method of the overlapping type of minizone, and a kind of method and base station to load balancing under the different covering scene.
For realizing the foregoing invention purpose, the present invention provides a kind of method of load balancing, and this method is used for moving load equalization methods under the different covering scene of different Access Networks, and described method comprises following steps:
Step 1): the step of judging the covering scene type;
Step 2): if when overlapping and layering scene, the then preferential step that adopts adjustment carrier wave priority;
Step 3): if during neighbours' scene, then adopt the method for switching, a part of user of overlapping overloaded cells is transferred to the underloading sub-district.
In the technique scheme, the step of said judgement covering scene type further comprises:
The reference signal of the base station of all neighbours base stations that neighbor list comprised that the serving BS at its place of step 601:UE measurement comprises;
Step 602: the system parameters of extracting signal strength signal intensity and base station;
Step 603: calculate the coverage of different base station, judge the cover type between different base station.
The step of said employing adjustment carrier wave priority further comprises:
Step 701: the carrier wave priority parameters of adjustment UE;
Step 702:UE is linked into high priority RAT.
Said a part of user with the overlapping region transfers to the underloading sub-district and further comprises:
Step 801: switching command is sent to edge customer in the base station;
Step 802: the underloading sub-district is switched as Target cell.
The present invention is based on the base station that a kind of load balancing is provided that said method is directed against in addition; Suitable load balancing strategy is chosen to different application scenes in this base station; Comprise: the scene judge module 101 that is positioned at user terminal; Being used to judge in the zone that load balancing takes place, is how to cover this zone between the different RAT technology; Be positioned at the priority adjusting module 102 of user terminal, be used for when the load balancing demand takes place, adjustment UE inserts the priority without the RAT technology; With the handover module that is positioned at the first cell base station side 103, be used for when the load balancing demand takes place, UE being switched to the underloading sub-district from overloaded cells.
In the technique scheme, said scene judges that mould further comprises: measurement module, be used to receive signal from different base station, and obtain the system parameters of different base station; And computing module, be used to calculate the coverage of different base station, draw the cover type between the base station.
Said priority adjusting module further comprises: receiver module is used to receive the order of serving BS adjustment priority; With adjustment carrier wave priority parameters module, be used to change the numerical value of user terminal carrier wave priority Control Parameter.
The invention has the advantages that this method is selected different load-balancing methods automatically according to different environment, has improved systematic function, make the variation that network can suitable environment.No matter be that Intra-RAT or Inter-RAT can both adopt the most effectively load-balancing method.And under the neighboring coverage condition, carrier wave priority parameters and handoff parameter are consistent.
Description of drawings
Fig. 1 is the composition frame chart of the base station of a kind of load balancing of the present invention;
Fig. 2 is the composition frame chart of the scene judge module that comprises of the base station of a kind of load balancing of the present invention;
Fig. 3 is the composition frame chart of the priority adjusting module that comprises of the base station of a kind of load balancing of the present invention;
Fig. 4 is the composition frame chart of the handover module that comprises of the base station of a kind of load balancing of the present invention;
Fig. 5 is the flow chart of a kind of load-balancing method of the present invention;
Fig. 6 is the particular flow sheet of judgement covering scene type step of the present invention;
Fig. 7 is the particular flow sheet of the step of preferential employing adjustment carrier wave priority of the present invention;
Fig. 8 is a particular flow sheet of a part of user of overlapping region being transferred to the underloading sub-district of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is carried out detailed explanation.
The present invention proposes the solution of the balanced MLB of moving load under a kind of different covering scene.This method mainly is under different covering scene, to adopt the different loads equalization methods respectively.When covering scene is overlapping and hierarchical: in this case; Many overlapping region covered all can be arranged between the different radio access technologies RAT; The present invention can realize that not only the user of cell edge can transfer on the sub-district of underloading, and the user at center also can transfer on the sub-district of underloading.The transfer of this central user can greatly alleviate the load of overloaded cells.To this situation, can realize through the priority that different wireless access technology RAT is set.If during the LTE overload, we can make it be lower than UMTS, thereby make not only edge customer through reducing the priority of LTE, and the user at center can reselect the UMTS network, come thereby LTE is replied from overload rapidly.And regulate handoff parameter this moment, although can cause the variation of HO boundary size, some users at edge switched on the UMTS, and the effect of this adjusting is very unobvious, LTE replied rapidly from overload come.So, under this coverage condition, preferentially adjust the priority of carrier wave, regulating handoff parameter then.When covering scene is Neighboring: under this covering, the situation of Inter-RATs is the same with the coverage condition of intra-LTE sub-district.Because the influence of the priority of different carrier is the size of district reselecting border Cell reselection boundary.As a rule, district reselecting border CRS can remain unchanged, but under UE Idle, district reselecting border CRS can be used for realizing the balanced MLB of moving load.Certainly, main still is through the optimization of handoff parameter.The adjustment of district reselecting border CRS will match with the adjustment of handoff parameter, not so can produce some problems (such as unnecessary switching etc.).So we think that the adjustment of carrier wave priority also will be along with the adjustment of switching the HO parameter, promptly CRS parameter in district reselecting border is wanted and switches the HO parameter to keep consistency.This step mainly under the neighboring covering scene, if cell reselection parameters and handoff parameter do not keep always, when the user when just beginning to select access network; Can at first select the high RAT of priority; After UE is connected to the high RAT of priority, because switching condition is satisfied in the setting of handoff parameter; UE will switch under other the RAT cell covered at once, will cause waste of radio resources like this.Not as being directly connected in the proper cell.
As shown in Figure 1, this figure is the composition frame chart of the base station of a kind of load balancing of the present invention, comprises:
Being positioned at the scene judge module 101 of user terminal, being used to judge in the zone that load balancing takes place, is how to cover this zone between the different RAT technology.
Be positioned at the priority adjusting module 102 of user terminal, be used for when the load balancing demand takes place, adjustment UE inserts the priority without the RAT technology.
Be positioned at the handover module 103 of the first cell base station side, be used for when the load balancing demand takes place, UE being switched to the underloading sub-district from overloaded cells.
As shown in Figure 2, this figure is the composition frame chart that is positioned at the scene judge module 101 of user terminal, comprises: measurement module 201, be used to receive signal from different base station, and obtain the system parameters of different base station.
As shown in Figure 3, this figure is the composition frame chart that is positioned at the priority adjusting module 102 of user terminal, comprises:
Adjust carrier wave priority parameters module 302, be used to change the numerical value of user terminal carrier wave priority Control Parameter.
As shown in Figure 4, this figure is the composition frame chart that is positioned at the handover module 103 of the first cell base station side, comprises:
Data cache module 401 is used at handoff procedure, the data that buffer memory receives.
Data forwarding module 402 is used for after switching completion, giving target BS with data forwarding.
As shown in Figure 5, this figure is the flow chart of a kind of load-balancing method of the present invention, and concrete steps are following:
Step 501: the step of judging the covering scene type;
Step 502: if when overlapping (overlapping) and layering (hierarchical) scene, the then preferential step that adopts adjustment carrier wave priority;
Step 503: if during neighbours (Neighboring) scene, then adopt the method for switching, a part of user of overlapping region is transferred to the underloading sub-district.
As shown in Figure 6, this figure is the substep flow chart that step 501 further comprises, comprise following substep: step 601:UE measure around reference signal RS signal and the intensity of RSRP of neighbours' different base station (comprising the base station under Intra-RAT and the Inter-RAT); RS signal the inside includes the system information SIB of base station, and (there is the parameter of cell selecting and gravity treatment the inside, comprises Cell identity, Cell selection and re-selection info and three information IE of Cell Access Restriction.)
Step 602: the system parameters (parameter of cell selecting and gravity treatment comprises Cell identity, Cell selection and re-selection info and three information IE of Cell Access Restriction) of extracting signal RSRP intensity and base station.
Step 603: calculate the coverage of different base station, judge the cover type between different base station.
According to the signal strength signal intensity that receives, see the thresholding that whether is lower than system definition, if do not have, then UE also is in the coverage of this system; Calculate the situation of all base stations, if UE is in this scope of covering of a plurality of base stations, the coverage between the base station is overlapping (overlapping) and layering (hierarchical) scene, otherwise is neighbours (Neighboring) scenes.
As shown in Figure 7, this figure is the flow chart of the substep that further comprises of step 502, and concrete steps are following:
Step 701: the carrier wave priority parameters of adjustment UE; There is the tabulation of individual candidate cell the UE the inside, and adjustment carrier wave priority is exactly the sequencing that changes sub-district, tabulation the inside in fact.
Step 702:UE is linked into high priority RAT.UE can cut off and being connected of existing sub-district, and directly sends to the sub-district of selecting and inserts request message.
As shown in Figure 8, this figure is the flow chart of the substep that further comprises of step 503, and concrete steps are following:
Step 801:eNB sends switching command to edge customer;
Step 802: the underloading sub-district is switched as Target cell.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; Technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. method to load balancing under the different covering scene, this method is used for moving load equalization methods under the different covering scene of different Access Networks, and described method comprises following steps:
Step 1): the step of judging the covering scene type;
Step 2): if when overlapping and layering scene, the then preferential step that adopts adjustment carrier wave priority;
Step 3): if during neighbours' scene, then adopt the method for switching, a part of user of overlapping overloaded cells is transferred to the underloading sub-district.
2. the method for load balancing according to claim 1 is characterized in that, the step of said judgement covering scene type further comprises:
The reference signal of all neighbours base stations that the neighbor list that the serving BS at its place of step 601:UE measurement comprises comprises;
Step 602: the system parameters of extracting signal strength signal intensity and base station;
Step 603: calculate the coverage of different base station, judge the cover type between different base station.
3. want the method for 1 described load balancing according to right, it is characterized in that, the step of said employing adjustment carrier wave priority further comprises:
Step 701: the carrier wave priority parameters of adjustment UE;
Step 702:UE is linked into high priority RAT.
4. the method for load balancing according to claim 1 is characterized in that, said a part of user with the overlapping region transfers to the underloading sub-district and further comprises:
Step 801: switching command is sent to edge customer in the base station;
Step 802: the underloading sub-district is switched as Target cell.
5. base station to load balancing under the different covering scene, suitable load balancing strategy is chosen to different application scenes in this base station, comprises:
Being positioned at the scene judge module 101 of user terminal, being used to judge in the zone that load balancing takes place, is how to cover this zone between the different RAT technology;
Be positioned at the priority adjusting module 102 of user terminal, be used for when the load balancing demand takes place, adjustment UE inserts the priority without the RAT technology; With
Be positioned at the handover module 103 of the first cell base station side, be used for when the load balancing demand takes place, UE being switched to the underloading sub-district from overloaded cells.
6. the base station of load balancing according to claim 5 is characterized in that, said scene judges that mould further comprises:
Measurement module is used to receive the signal from different base station, obtains the system parameters of different base station; With
Computing module is used to calculate the coverage of different base station, draws the cover type between the base station.
7. the base station of load balancing according to claim 5 is characterized in that, said priority adjusting module further comprises:
Receiver module is used to receive the order of the adjustment priority that the serving BS at user place sends; With
Adjust carrier wave priority parameters module, be used to change the numerical value of user terminal carrier wave priority Control Parameter.
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| CN102938910A (en) * | 2012-11-30 | 2013-02-20 | 西安电子科技大学 | Enhancement type load balancing method based on adjacent region load information |
| CN103813384A (en) * | 2012-11-13 | 2014-05-21 | 中国移动通信集团广东有限公司 | Method and device for balancing business in wireless network cell set |
| CN105554818A (en) * | 2015-12-21 | 2016-05-04 | 中国联合网络通信集团有限公司 | Load equalizing method and device |
| WO2016165585A1 (en) * | 2015-04-15 | 2016-10-20 | 电信科学技术研究院 | Load balancing method and equipment |
| CN108353287A (en) * | 2015-11-03 | 2018-07-31 | 华为技术有限公司 | Load rebalances System and method for |
| CN108541022A (en) * | 2017-03-02 | 2018-09-14 | 中国移动通信有限公司研究院 | A kind of method and device for realizing Network Load Balance |
| WO2018205501A1 (en) * | 2017-05-11 | 2018-11-15 | 上海中兴软件有限责任公司 | Mobility parameter adjustment method and apparatus, and computer storage medium |
| CN110234130A (en) * | 2014-07-16 | 2019-09-13 | 思科技术公司 | Neighbours plan between technology between frequency on self-organizing network |
| CN110312271A (en) * | 2014-08-06 | 2019-10-08 | 思科技术公司 | Neighbours plan between technology between frequency on self-organizing network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103813384A (en) * | 2012-11-13 | 2014-05-21 | 中国移动通信集团广东有限公司 | Method and device for balancing business in wireless network cell set |
| CN102938910B (en) * | 2012-11-30 | 2015-02-18 | 西安电子科技大学 | Enhancement type load balancing method based on adjacent region load information |
| CN102938910A (en) * | 2012-11-30 | 2013-02-20 | 西安电子科技大学 | Enhancement type load balancing method based on adjacent region load information |
| CN110234130B (en) * | 2014-07-16 | 2023-04-07 | 思科技术公司 | Inter-frequency and inter-technology neighbor planning on ad hoc networks |
| CN110234130A (en) * | 2014-07-16 | 2019-09-13 | 思科技术公司 | Neighbours plan between technology between frequency on self-organizing network |
| CN110312271A (en) * | 2014-08-06 | 2019-10-08 | 思科技术公司 | Neighbours plan between technology between frequency on self-organizing network |
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| WO2016165585A1 (en) * | 2015-04-15 | 2016-10-20 | 电信科学技术研究院 | Load balancing method and equipment |
| CN108353287A (en) * | 2015-11-03 | 2018-07-31 | 华为技术有限公司 | Load rebalances System and method for |
| CN108353287B (en) * | 2015-11-03 | 2020-11-03 | 华为技术有限公司 | Load rebalancing system and method |
| CN105554818A (en) * | 2015-12-21 | 2016-05-04 | 中国联合网络通信集团有限公司 | Load equalizing method and device |
| CN105554818B (en) * | 2015-12-21 | 2018-09-25 | 中国联合网络通信集团有限公司 | A kind of load equalization method and device |
| CN108541022A (en) * | 2017-03-02 | 2018-09-14 | 中国移动通信有限公司研究院 | A kind of method and device for realizing Network Load Balance |
| CN108541022B (en) * | 2017-03-02 | 2021-11-09 | 中国移动通信有限公司研究院 | Method and device for realizing network load balance |
| WO2018205501A1 (en) * | 2017-05-11 | 2018-11-15 | 上海中兴软件有限责任公司 | Mobility parameter adjustment method and apparatus, and computer storage medium |
| US10869240B2 (en) | 2017-05-11 | 2020-12-15 | Shanghai Zte Software Co., Ltd. | Method and device for adjusting mobility parameter, computer storage medium |
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Application publication date: 20120926 |