CN105282790B - A kind of load-balancing method and base station suitable for heterogeneous network - Google Patents
A kind of load-balancing method and base station suitable for heterogeneous network Download PDFInfo
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- CN105282790B CN105282790B CN201410360866.3A CN201410360866A CN105282790B CN 105282790 B CN105282790 B CN 105282790B CN 201410360866 A CN201410360866 A CN 201410360866A CN 105282790 B CN105282790 B CN 105282790B
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Abstract
The present invention discloses a kind of load-balancing method suitable for heterogeneous network and base station, the load-balancing method suitable for heterogeneous network include：The cell load state monitoring information that macro base station monitors macrocell load state in real time and real-time reception cell reports；The macro base station adaptively adjusts almost blank subframe ABS sub-frame configurations quantity according to the load state of the macrocell and cell；When the macro base station determines that the ABS sub-frame configurations quantity reaches critical value, according to the load state of the macrocell and cell, the bias bias of adjustment cell coverage area extension CRE realizes load balancing.Method disclosed by the invention has considered the adjustment of the adjustment and ABS sub-frame numbers of CRE amount of bias bias, improves the effect of the load balancing of heterogeneous network.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of load-balancing method and base suitable for heterogeneous network
It stands.
Background technology
Mobile communication standard tissue 3GPP proposes heterogeneous network in the standardization of LTE-Advanced, in order to solve
The load imbalance problem of heterogeneous network cross-layer minizone, improves the utilization rate of system resource, and 3GPP proposes MPS process model
Expansion technique CRE (Cell Range Expansion) is enclosed, i.e., in the Reference Signal Received Power RSRP of cell
Increase an amount of bias bias on (Reference Signal Receiving Power) so that close to the macrocell of cell
User's priority access is to cell, to mitigate macrocell load.Bias is arranged bigger, and the coverage extension of cell obtains
It is bigger, it has more macrocell users and moves to cell；Conversely, bias is arranged smaller (or CRE functions are closed), then it is small
The limited coverage area of cell.
When bias is arranged larger, the macrocell user in the CRE coverage areas in cell can be by from macro
The strong downlink interference of cell, needs using downlink enhancing interference coordination technique (eICIC, enhanced inter-cell
Interference coordination) it avoids interfering.Downlink enhancing interference coordination technique defines ABS subframes (Almost
Blank Subframe, almost blank subframe), interference cell-of-origin, that is, macrocell (is only sent in ABS subframes without data transmission
Reference signal and some necessary signals, such as PBCH, PSS, SSS), and being disturbed cell i.e. cell can be by disturbed user's tune
Degree is in ABS subframes, to avoid the downlink interference that interfered cell is strong.Since the configuration of ABS subframes is to sacrifice the money of macrocell
Source is cost, if ABS sub-frame numbers were arranged at most lead to macrocell heavier loads, if conversely, ABS sub-frame numbers
It is arranged to very few, then cannot meet the resource requirement of small Cell Edge User so that the edge load of cell is heavier.Therefore,
The configuration of ABS sub-frame numbers has larger impact to the load of cross-layer cell.
Existing load balancing scheme includes under heterogeneous network scene：The first scheme, according to the load feelings of cross-layer cell
Condition dynamic adjusts the scheme of the CRE amount of bias bias of cell, and the program does not consider the ABS sub-frame numbers in eICIC technologies
Configuration；Second scheme adjusts the dynamic eICIC interference coordinations of ABS sub-frame numbers according to the loading condition of cross-layer cell dynamic
Scheme, the program do not consider the CRE amount of bias bias of cell being adjusted.
The shortcomings that prior art is：The first scheme continually carries out the CRE amount of bias bias adjustment of cell, increases
Space interface signaling expense is added；Second scheme can not be after when ABS sub-frame numbers are adjusted to critical value (maximum value or minimum value)
Continuous adjustment ABS sub-frame numbers, therefore influence the effect of load balancing.
Invention content
The technical problem to be solved by the present invention is to the prior arts according to the loading condition of cross-layer cell load
The CRE amount of bias bias adjustment that cell is continually carried out when weighing apparatus, increases space interface signaling expense, ABS sub-frame numbers are adjusted to
The problem of can not continuing to adjust ABS sub-frame numbers, influence the effect of load balancing when critical value (maximum value or minimum value).
For this purpose, in a first aspect, the present invention proposes a kind of load-balancing method suitable for heterogeneous network, the method
Including：
The cell load state monitoring that macro base station monitors macrocell load state in real time and real-time reception cell reports
Information；
The macro base station adaptively adjusts almost blank subframe ABS according to the load state of the macrocell and cell
Sub-frame configuration quantity；
When the macro base station determines that the ABS sub-frame configurations quantity reaches critical value, according to the macrocell and cell
Load state, the bias bias of adjustment cell coverage area extension CRE realizes load balancing；
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
Optionally, the macro base station adaptively adjusts almost blank according to the load state of the macrocell and cell
Before the step of subframe ABS sub-frame configuration quantity, the method further includes：
The macro base station determines that cell opens cell coverage area according to the load state of the macrocell and cell
Extend CRE functions.
Optionally, the macro base station determines that cell is opened cell and covered according to the load state of the macrocell and cell
Lid range extend CRE functions the step of include：
The macro base station determines that macrocell load is more than default first thresholding, the macrocell being in small cell coverage area
User load is more than to determine that cell opens the CRE when default second thresholding and small cell load are less than default third thresholding
Function.
Optionally, when the macro base station determines that almost blank subframe ABS sub-frame configurations quantity reaches critical value, according to described
The load state of macrocell and cell, adjusting the step of cell coverage area extends the bias bias of CRE includes：
The macro base station determines that the ABS sub-frame configurations quantity reaches minimum value, macrocell load is more than first default
When the macrocell user load for limiting and being in small cell coverage area is more than default second thresholding, the inclined of the CRE is turned up
Set value bias；
The macro base station determine the ABS sub-frame configurations quantity reach maximum value, be in it is macro in small cell coverage area
When community user load is more than default four thresholding, the bias bias of the CRE is reduced.
Optionally, when the macro base station determines that the ABS sub-frame configurations quantity reaches critical value, according to the macrocell and
After the step of bias bias of the load state of cell, adjustment cell coverage area extension CRE realizes load balancing, institute
The method of stating further includes：
The macro base station determine the macrocell user load that is in small cell coverage area less than default 5th thresholding and
Determine that cell closes CRE functions when the edge customer load of cell is less than default six thresholding.
Second aspect, the present invention also propose a kind of base station suitable for heterogeneous network load balancing, and the base station includes：
Monitoring unit, for monitoring macrocell load state in real time；
Receiving unit, the cell load state monitoring information reported for real-time reception cell；
ABS sub-frame configuration processing units are adjusted, it is adaptive to adjust for the load state according to the macrocell and cell
Whole almost blank subframe ABS sub-frame configuration quantity；
The bias bias units for adjusting CRE, when for determining that the ABS sub-frame configurations quantity reaches critical value, according to
The bias bias of the load state of the macrocell and cell, adjustment cell coverage area extension CRE realizes load balancing；
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
Optionally, the base station further includes：
Determine that cell opens CRE functional units, it is small for being determined according to the load state of the macrocell and cell
Cell opens cell coverage area and extends CRE functions.
Optionally, the determination cell opens CRE functional units, for determining that macrocell load is more than first default
The macrocell user load limit, being in small cell coverage area is more than default second thresholding and small cell load less than default
Determine that cell opens the CRE functions when third thresholding.
Optionally, the bias bias units of the adjustment CRE, for determining that the ABS sub-frame configurations quantity reaches most
Small value, macrocell load are more than default first thresholding and the macrocell user load being in small cell coverage area is more than pre-
If when the second thresholding, the bias bias of the CRE is turned up；
The bias bias units of the adjustment CRE are additionally operable to determine that the ABS sub-frame configurations quantity reaches maximum value, place
When macrocell user load in small cell coverage area is more than default four thresholding, the bias bias of the CRE is reduced.
Optionally, the base station further includes：
Determine that cell closes CRE functional units, for determining that the macrocell user being in small cell coverage area is negative
It carries when the edge customer load less than default 5th thresholding and cell is less than default six thresholding and determines that cell closes CRE work(
Energy.
It is provided by the invention to have considered CRE amount of bias bias suitable for the load-balancing method of heterogeneous network and base station
Adjustment and the adjustment of ABS sub-frame numbers, reduce bias number of CRE amount of bias of adjustment cell, reduce space interface signaling
Expense improves the effect of the load balancing of heterogeneous network.
Load-balancing method and base station provided by the invention suitable for heterogeneous network by preferentially carry out ABS resources from
Adjustment is adapted to, the up-regulation of CRE amount of bias bias is carried out further according to condition judgment, lowers, to realize macrocell and its overlay area
Load balancing between interior multiple cells avoids local cell heavy duty and influences the service quality of access service as possible, from
And reach the promotion of systematic entirety energy.
It is provided by the invention to pass through the tune in CRE amount of bias bias suitable for the load-balancing method of heterogeneous network and base station
It is whole that adjustment priority is set between the two with ABS sub-frame numbers adjustment, it not only ensure that the load balancing between cross-layer cell, but also
Reasonable disposition and system resource the distributing rationally between cross-layer cell of ABS resources can be reached, can get higher interference association
Adjust performance gain and system capacity gain.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 shows the load-balancing method schematic diagram suitable for heterogeneous network of embodiment one；
Fig. 2 shows the load balancing base station structure diagrams suitable for heterogeneous network of embodiment two.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention is explicitly described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Embodiment one：
The present embodiment discloses a kind of load-balancing method suitable for heterogeneous network, as shown in Figure 1, the method may include
Following steps：
The cell load state that 101. macro base station monitors macrocell load state in real time and real-time reception cell reports
Monitoring information；
102. the macro base station is according to the load state of the macrocell and cell, adaptive to adjust almost blank subframe
ABS sub-frame configuration quantity, the method adaptively adjusted can utilize existing algorithm to realize；
103. the macro base station determines that the ABS sub-frame configurations quantity reaches critical value, according to the macrocell and small
The bias bias of the load state of cell, adjustment cell coverage area extension CRE realizes load balancing；
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
In a particular application, before aforementioned step 102, the method for the present embodiment may also include not to be shown in following figures
The step 101 gone out '：
101 ', macro base station described in determines that small cell opens MPS process according to the load state of the macrocell and cell
Range extends CRE functions.
In a particular application, the step 101 ' it can be realized by following processes：
The macro base station determines that macrocell load is more than default first thresholding, the macrocell being in small cell coverage area
User load is more than to determine that cell opens the CRE when default second thresholding and small cell load are less than default third thresholding
Function.
In a particular application, the step 103 can be realized by following processes：
The macro base station determines that the ABS sub-frame configurations quantity reaches minimum value, macrocell load is more than first default
When the macrocell user load for limiting and being in small cell coverage area is more than default second thresholding, the inclined of the CRE is turned up
Set value bias；
The macro base station determine the ABS sub-frame configurations quantity reach maximum value, be in it is macro in small cell coverage area
When community user load is more than default four thresholding, the bias bias of the CRE is reduced.
The adjustment process of above-mentioned CRE bias bias, can cause the variation of macrocell and small cell load, may cause
The adaptive adjustment of ABS sub-frame configurations, and then realize the stabilization of system, reach the load balancing of cross-layer minizone.
In a particular application, after aforementioned step 103, the method for the present embodiment may also include not to be shown in following figures
The step 104 gone out：
104. the macro base station determines the macrocell user load being in small cell coverage area less than 5th default
Determine that cell closes CRE functions when the load of the edge customer of limit and cell is less than default six thresholding.
The load-balancing method suitable for heterogeneous network of the present embodiment has the beneficial effect that：
One, the adjustment for having considered the adjustment and ABS sub-frame numbers of CRE amount of bias bias reduces the small cell of adjustment
Bias number of CRE amount of bias, reduce space interface signaling expense, increase the load that space interface signaling expense improves heterogeneous network
Balanced effect.
Two, by preferentially carrying out the adaptive adjustment of ABS resources, carry out CRE amount of bias bias's further according to condition judgment
Up-regulation is lowered, and to realize the load balancing in macrocell and its overlay area between multiple cells, it is small to avoid part as possible
Area is heavily loaded and influences the service quality of access service, to reach the promotion of systematic entirety energy.
Three, by the way that adjustment is arranged between the two preferentially in the adjustment of CRE amount of bias bias and the adjustment of ABS sub-frame numbers
Grade, not only ensure that the load balancing between cross-layer cell, but also can reach ABS resources reasonable disposition and system resource it is small in cross-layer
Distributing rationally between area can get higher interference coordination performance gain and system capacity gain.
Embodiment two：
The present embodiment discloses a kind of base station suitable for heterogeneous network load balancing, and base station shown in Fig. 2 is preceding method
Macro base station in embodiment, by way of example only, the present embodiment does not limit the composition of the unit module in macro base station to the present embodiment
The arrangement mode of mode and unit module, the base station may include：
Monitoring unit, for monitoring macrocell load state in real time；
Receiving unit, the cell load state monitoring information reported for real-time reception cell；
Determine that cell opens CRE functional units, it is small for being determined according to the load state of the macrocell and cell
Cell opens cell coverage area and extends CRE functions；
ABS sub-frame configuration processing units are adjusted, it is adaptive to adjust for the load state according to the macrocell and cell
Whole almost blank subframe ABS sub-frame configuration quantity；
The bias bias units for adjusting CRE, when for determining that the ABS sub-frame configurations quantity reaches critical value, according to
The bias bias of the load state of the macrocell and cell, adjustment cell coverage area extension CRE realizes load balancing；
Determine that cell closes CRE functional units, for determining that the macrocell user being in small cell coverage area is negative
It carries when the edge customer load less than default 5th thresholding and cell is less than default six thresholding and determines that cell closes CRE work(
Energy.
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
In a particular application, the determination cell opens CRE functional units, for determining that macrocell load is more than default
First thresholding, the macrocell user being in small cell coverage area load are more than that default second thresholding and small cell load are low
Determine that cell opens the CRE functions when default third thresholding.
In a particular application, the bias bias units of the adjustment CRE, for determining the ABS sub-frame configurations quantity
Reach minimum value, macrocell load is more than default first thresholding and the macrocell user load being in small cell coverage area
When more than default second thresholding, the bias bias of the CRE is turned up；
The bias bias units of the adjustment CRE are additionally operable to determine that the ABS sub-frame configurations quantity reaches maximum value, place
When macrocell user load in small cell coverage area is more than default four thresholding, the bias bias of the CRE is reduced.
The meaning and correlativity of six kinds of thresholdings involved in embodiment one and embodiment two are as follows：
Default first thresholding is macrocell heavy duty thresholding；Default second thresholding is macrocell edge heavy duty thresholding；In advance
If third thresholding is the light load-threshold of cell；Default 4th thresholding is small cell edge heavy duty thresholding；Default 5th thresholding
For the light load-threshold in macrocell edge；Default 6th thresholding is the light load-threshold of small cell edge.Wherein described first thresholding,
Two thresholdings, the 4th thresholding value are identical, and the third thresholding, the 5th thresholding, the 6th thresholding value are quite and less than described first
Thresholding, the second thresholding, the 4th thresholding.This six thresholding values can be determined and adjust according to practical networking experience.
It should be noted that herein, first thresholding, the second thresholding ..., the 6th thresholding are used merely to one
Threshold value and another threshold value distinguish, rather than relationship or sequence between implying these threshold values.
It will be understood by those skilled in the art that can adaptively be changed to the module in the equipment in embodiment
And they are provided in the different one or more equipment of the embodiment.Can in embodiment module or unit or
Component is combined into a module or unit or component, and can be divided into multiple submodule or subelement or subgroup in addition
Part.In addition to such feature and/or at least some of process or unit are mutually exclusive places, any combinations may be used
To all features disclosed in this specification and all processes or unit of so disclosed any method or equipment carry out
Combination.Unless expressly stated otherwise, each feature disclosed in this specification can be by providing identical, equivalent or similar purpose
Alternative features replace.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means in of the invention
Within the scope of and form different embodiments.
The all parts embodiment of the present invention can be with hardware realization, or to run on one or more processors
Software module realize, or realized with combination thereof.It will be understood by those of skill in the art that can use in practice
In the equipment of microprocessor or digital signal processor (DSP) to realize a kind of browser terminal according to the ... of the embodiment of the present invention
Some or all components some or all functions.The present invention is also implemented as executing side as described herein
Some or all equipment or program of device (for example, computer program and computer program product) of method.It is such
Realize that the program of the present invention can may be stored on the computer-readable medium, or can be with the shape of one or more signal
Formula.Such signal can be downloaded from internet website and be obtained, and either be provided on carrier signal or with any other shape
Formula provides.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of load-balancing method suitable for heterogeneous network, which is characterized in that the method includes：
The cell load state monitoring information that macro base station monitors macrocell load state in real time and real-time reception cell reports；
The macro base station adaptively adjusts almost blank subframe ABS subframes according to the load state of the macrocell and cell
Configure quantity；
When the macro base station determines that the ABS sub-frame configurations quantity reaches critical value, according to the negative of the macrocell and cell
The bias bias of load situation, adjustment cell coverage area extension CRE realizes load balancing；
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
2. according to the method described in claim 1, it is further characterized in that, the macro base station is according to the macrocell and cell
Load state, before adaptive the step of adjusting almost blank subframe ABS sub-frame configurations quantity, the method further includes：
The macro base station determines that cell opens cell coverage area extension according to the load state of the macrocell and cell
CRE functions.
3. according to the method described in claim 2, it is characterized in that, the macro base station is according to the macrocell and cell
Load state determines that the step of cell opens cell coverage area extension CRE functions includes：
The macro base station determines that macrocell load is more than default first thresholding, the macrocell user being in small cell coverage area
Load is more than to determine that cell opens the CRE work(when default second thresholding and small cell load are less than default third thresholding
Energy.
4. according to the method described in claim 1, it is characterized in that, the macro base station determines that almost blank subframe ABS subframes are matched
When setting quantity and reaching critical value, according to the load state of the macrocell and cell, adjustment cell coverage area extension CRE's
The step of bias bias includes：
The macro base station determine the ABS sub-frame configurations quantity reach minimum value, macrocell load be more than default first thresholding with
And the macrocell user load being in small cell coverage area is more than that when presetting the second thresholding, the bias of the CRE is turned up
bias；
The macro base station determines the macrocell that the ABS sub-frame configurations quantity reaches maximum value, is in small cell coverage area
When user load is more than default four thresholding, the bias bias of the CRE is reduced.
5. according to the method described in claim 1, it is further characterized in that, the macro base station determines the ABS sub-frame configurations quantity
When reaching critical value, according to the load state of the macrocell and cell, the bias of adjustment cell coverage area extension CRE
After bias realizes the step of load balancing, the method further includes：
The macro base station determines the macrocell user load that is in small cell coverage area less than default 5th thresholding and slight
Determine that cell closes CRE functions when the edge customer load in area is less than default six thresholding.
6. a kind of base station suitable for heterogeneous network load balancing, which is characterized in that the base station includes：
Monitoring unit, for monitoring macrocell load state in real time；
Receiving unit, the cell load state monitoring information reported for real-time reception cell；
ABS sub-frame configuration processing units are adjusted, for the load state according to the macrocell and cell, are adaptively adjusted several
Blank subframe ABS sub-frame configuration quantity；
The bias bias units for adjusting CRE, when for determining that the ABS sub-frame configurations quantity reaches critical value, according to described
The bias bias of the load state of macrocell and cell, adjustment cell coverage area extension CRE realizes load balancing；
Wherein, the critical value is determined according to the default time slot proportion of macro base station；
Wherein, the critical value includes maximum value, minimum value.
7. base station according to claim 6, it is further characterized in that, the base station further includes：
Determine that cell opens CRE functional units, for determining small cell according to the load state of the macrocell and cell
It opens cell coverage area and extends CRE functions.
8. base station according to claim 7, which is characterized in that the determination cell opens CRE functional units, is used for
Determine that macrocell load be more than default first thresholding, the macrocell user being in small cell coverage area load is more than default the
Two thresholdings and small cell load determine that cell opens the CRE functions when being less than default third thresholding.
9. base station according to claim 6, which is characterized in that the bias bias units of the adjustment CRE, for determining
The ABS sub-frame configurations quantity reaches minimum value, macrocell load is more than default first thresholding and is in small MPS process model
When macrocell user load in enclosing is more than default second thresholding, the bias bias of the CRE is turned up；
It is described adjustment CRE bias bias units be additionally operable to determine the ABS sub-frame configurations quantity reach maximum value, be in it is small
When macrocell user load in cell coverage area is more than default four thresholding, the bias bias of the CRE is reduced.
10. base station according to claim 6, it is further characterized in that, the base station further includes：
Determine that cell closes CRE functional units, for determining that the macrocell user being in small cell coverage area load is low
Determine that cell closes CRE functions when the edge customer load of default 5th thresholding and cell is less than default six thresholding.
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| CN107567047A (en) * | 2017-09-28 | 2018-01-09 | 北京邮电大学 | A kind of load-balancing method based on network traffics temporal and spatial orientation in heterogeneous network |
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| CN107317645B (en) * | 2016-04-26 | 2019-06-25 | 大唐移动通信设备有限公司 | A kind of method and device of Inter-Cell Interference Coordination |
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| CN105282790A (en) | 2016-01-27 |
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