CN105722165B - Handoff parameter self-configuration method based on the perception of high frequency failed handoff - Google Patents
Handoff parameter self-configuration method based on the perception of high frequency failed handoff Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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Abstract
The present invention is claimed the handoff parameter self-configuration method based on the perception of high frequency failed handoff in a kind of isomery cellular network and belongs to wireless communication technology field; in the method; network surveys constructing environment and perceives SON entity, passes through handover event information of the rrc layer for a long time in acquisition network environment and carries out characterization and obtain performance of handoffs geographical distribution table.SON is using the distribution table as optimization foundation when the network operation, specific measurement parameter is generated to the UE for entering high frequency HOF (handover failure) generation area and UE is handed down to by rrc layer, its measuring configuration is modified, performance of handoffs of the UE in the region high frequency HOF is promoted.
Description
Technical field
The invention belongs to wireless communication technology field, it is related in a kind of isomery cellular network based on high frequency failed handoff
The handoff parameter self-configuration method of perception.
Background technique
In the evolution process of mobile communication system, due to popularizing for various intelligent terminals, blowout will occur for data traffic
The growth of formula, Future Data business will be mainly distributed on indoor and hot zones.Therefore, intensive isomery small cell network will become
Improve the network coverage, significantly one of the main means of lifting system capacity.More intensive network deployment, but also network is opened up
Flutter it is more complicated, based on terminal capability promoted mobility enhanced scheme, cell quickly find, intensive minizone cooperate, and
The self-organizing network SON etc. for comprehensively considering various aspects is the research hotspot in terms of current isomery cellular network.
SON (Self-Organizing Network, self-organizing network) is the complete set for developing with LTE and drawing
Network theory and specification.SON is mainly proposed that main thought is to realize some autonomic functions of wireless network by operator,
Artificial participation is reduced, is cut operating costs.The function of SON can mainly be concluded are as follows: self-configuring, self-optimizing, self-healing.It is next-generation
Mobile communications network proposes higher demand to SON.
SON needs more intelligent to cope with network requirement end to end.Existing SON is to the location of covering cavity, table tennis
Pang it is Zone switched the problems such as understanding, be all based on test data or user report etc. sky when in terms of knowledge, but reality
On border, this way does not meet a new generation simultaneously and efficient resource is utilized and the Targets of low delay, the bottleneck that solution
Key, in that SON needs more intelligent, and more intelligent SON can be by SON engine sensing network environment, and structure
Build the behavior that dynamic network environment model carrys out forecasting system.
The SON of a new generation has big time span.The variation of wireless environment will affect the performance of network.Past is most
Several research is devoted to solve inefficient brought by short time variation (rapid fading, shadow effect) and loss problem.In fact,
When SON uses big time span, system effectiveness can be more preferably utilized.Therefore, the SON in a new generation needs to solve network not
Bring inefficiency problem when can well adapt to change for a long time, and solve the problems, such as this key, it is that SON network has length
The ability of temporal adaptation network change.
New Generation Mobile Communication Network needs unified KPI.Since SON is needed in a variety of subscriber access modes, Duo Zhongshe
It is used under more various environment such as standby provider.Therefore, unified index is very necessary.In order to sufficiently realize SON's
Various functions need to establish a new, unified cross-layer KPI, which both can accurately reflect the experience of user,
The quantization of index can be carried out to each layer of network.
The SON for needing active of New Generation Mobile Communication Network.SON function in 3G or 4G is all designed to work as and ask
When topic occurs, reflected.And such SON reactive machanism is unable to satisfy the requirement for the low delay that a new generation is proposed,
Because a large amount of time is wasted in the observation of environment, problem analysis, above the settlement mechanism that sets out.Therefore, for the SON of a new generation
For, it needs to change traditional passive coping mechanism, becomes the countermeasure of active.
With the proposition of 5G, the diversity (such as user freely disposes Home eNodeB) of intensive and the network deployment of networking
It is further promoted, thus efficiency to mobile management and accuracy are also required to higher requirement.For being sent out in network
The switching of macrocellular is arrived in switching and macrocellular between raw frequent cellulor to cellulor again, is reduced handover delay, is avoided
Unnecessary switching is the research emphasis of switchover policy in isomery Cellular Networks.It is existing due to the limitation of data storage and processing ability
A large amount of data, which fail to be fully utilized, in some networks is just dropped, and causes a kind of waste.Letter has been come into now
Breath epoch, a large amount of data have been applied in every field.
Summary of the invention
For the above the deficiencies in the prior art, a kind of method that performance of handoffs can be brought to be promoted is proposed.Especially phase
Utilize environment sensing from group to when occurring user's random placement SmallCell or Home eNodeB situation in intensive heterogeneous network scene
Knitmesh network technology perception handoff environment information, for the method for specific region progress mobile robustness optimization technical side of the invention
Case is as follows: a kind of handoff parameter self-configuration method based on the perception of high frequency failed handoff comprising following steps:
In step 1) isomery cellular network, network side be arranged long time scale environment sensing SON entity, specifically include as
Lower submodule: for carrying out environment sensing SON interface, the environment information acquisition module, environment of information exchange with other protocol layers
Characterization module, environmental characteristic information bank and SON configure self-optimizing module, and the module is by Optimization Algorithms Library and network autogamy
Set module composition；UE position estimation module is enabled in network side simultaneously and carries out user location measurement, as acquisition environmental information
Ancillary equipment；
Environment information acquisition module in step 2) environment sensing SON entity is obtained from isomery cellular network rrc layer entity
Handover management Key Performance Indicator, i.e. handover failure switch successfully two kinds of network switching events, handover management Key Performance Indicator
The environmental information obtained needed for being with the user location estimated result that step 1) obtains；
Handover management Key Performance Indicator and the user location estimation that step 3) gets environment information acquisition module are tied
Two kinds of environmental informations of fruit are input to environmental characteristic processing module, carry out environmental information analysis processing, obtain characterizing comprehensively
The performance of handoffs geographical distribution table of high frequency failed handoff in current network area, and store to Environmental Information Feature information
Library；
Step 4) is directed into matching in SON entity every certain large scale time cycle, by performance of handoffs geographical distribution table
Self-optimizing module is set as self-optimizing foundation, self-optimizing module targetedly optimizes according to the formulation of the environment sensing result of back
Strategy generates new RRC measuring configuration parameter for it if detecting some position UE enters high frequency handover failure generation area
Triggered time TTT and A3 bias；
Configuration parameter after optimization is issued to rrc layer by step 5) SON entity, and rrc layer generates RRC according to parameter value and is reconfigured
Message is set, corresponding UE is sent to, modifies the RRC measuring configuration of the UE, completes parameter configuration.
Further, in step 2) SON entity from rrc layer obtain handover management Key Performance Indicator pass through environment sensing
SON interface is realized, and the SON entity of network side will establish data exchange interface with user location estimation module E-SMLC,
Customer position information is obtained while recording handover management Key Performance Indicator, obtains handover management key performance after establishing association
Index geographical distribution situation.
Further, in step 2) environment sensing SON performing environment information gathering process, environment information acquisition module passes through
Environment sensing SON interface and rrc layer establish data exchange channel, and whenever there is handover event in network, RRC will the switching
The type of event switches successfully or failure, and is reported to environment information acquisition module together with the corresponding UEid of the event,
Environment information acquisition module is worked as according to the UE identifier received to E-SMLC request immediately after receiving handover event information
The location information of preceding moment UE, and combine the location information with handover event information, it generates
HandoverEventInformationElement is stored as environmental information element.
Further, if environment information analysis treatment process is established in step 2) continuous collecting environmental information in step 3)
After dry long-time, these environmental informations are input to environmental characteristic processing module and carry out Data Analysis Services, obtain switching
Energy geographical distribution table, environment sensing SON carry out rasterizing to travelling performance handover management Key Performance Indicator geographic profile information
Network area is divided into multiple grids according to the area of the current administrative network area SON, is later each grid region by processing
Calculate corresponding switching self-optimizing weight；The weight can be directly with handover failure rate HOF/ (HOS+HOF) table in grid region
Show, if weight is denoted as -1, the HOFrate handover failure rate meter of all grid regions there is no any switching in certain region
It is high frequency handover failure spot by the zone marker if the HOFrate in certain region is more than preset thresholding after the completion of calculation
Band；Treated, and performance of handoffs geographical distribution table imports SON configuration self-optimizing module.
Further, SON configures self-optimizing module and imports environmental information data as parameter self-optimizing foundation in step 4)
Specifically: in the network operation, SON entity configuration self-optimizing module once learns that some UE enters step 3) and obtains from E-SMLC
Performance of handoffs geographical distribution table in the region high frequency HOF that is identified, the as specific RRC measurement parameter of the UE decision making
TTT and A3_OFFSET, new parameter value are handed down to rrc layer agreement by the handshake interface between SON entity and rrc layer
Stack.
Further, in the step 5), after rrc layer receives the RRC measurement parameter of the new decision of SON entity, one is generated
New reports configuration information unit, and configuration triggering type is event triggering type, and event type A3, the triggered time, TTT and A3 were inclined
Value is set to be configured according to the parameter value received from SON, measurement amount is set as RSRP, report configuration IE other fields still according to
Original configuration, after reporting configuration to generate, RRC generates a MeasConfig measurement configuration information unit, reports configuration for above-mentioned
It is added in the ReportConfigToAddModList queue of measuring configuration, finally, RRC encapsulates the MeasConfig to RRC
In reallocation message RRC_Reconfiguration, it is handed down to UE, execution measurement reconfigures after UE receives RRC reallocation message, repairs
Change the RRC measurement parameter of itself.
It advantages of the present invention and has the beneficial effect that:
For the present invention compared with traditional SON technology, this method is based on environment sensing SON, has fully taken into account isomery Cellular Networks
Network changes for a long time, and user, which freely disposes Home eNodeB, especially in Future cellular networks makes network topology slowly varying institute occur
Bring inefficiency problem.SON can Intellisense handoff environment information as caused by network structure or the variation of network-intensive degree
Change, is that can bring the promotion of performance of handoffs according to progress mobile robustness optimization with environmental information.
Detailed description of the invention
Fig. 1 is the long time scale environment sensing SON framework that the present invention provides that preferred embodiment is relied on；
Fig. 2 is environment information acquisition and self-optimizing detail flowchart；
Fig. 3 is that regular networking scene method implements front and back effect of optimization comparison；
Fig. 4 is that user networking scene method implements front and back effect of optimization comparison；
Fig. 5 is the handoff parameter self-configuration method overview flow chart perceived based on high frequency failed handoff.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described:
Implement relied on long time scale environment sensing SON framework as shown in FIG. 1, FIG. 1 is this method.In network side structure
Long time scale environment sensing SON entity is built, while enabling UE position estimation module in network side and carrying out the measurement of the position UE, is made
For the auxiliary for obtaining environmental information.Long time scale environment sensing SON entity, specifically include following submodule: being used for and other
Protocol layer carries out the environment sensing SON interface of information exchange, environment information acquisition module, environmental characteristic processing module, environment
Characteristic information library and SON configuration self-optimizing module (module is made of Optimization Algorithms Library and aspect of network self-configuration module).Pass through
Large scale environment sensing SON module interface, SON module acquires environmental data from isomery cellular network lower-layer protocols stack, such as nothing
Wired link measurement data, user location detection data, resource utilization situation, handover success/failure statistical data etc., by these
The network behavior model (indices distribution situation in i.e. relatively accurate network environment) obtained after data summarization analysis.
SON engine is predicted according to network environment of the network behavior model to special time period, and issues corresponding self-optimizing, self-configuring
Parameter etc. is to isomery cellular network.
Fig. 2 is based on environment information acquisition and self-optimizing detail flowchart.Environmental perception module is with the long time scale period
The acquisition of performance of handoffs data is executed, and obtains corresponding UE geographical location information, two kinds of data knots from UE position estimation module
It closes post-processing and obtains performance of handoffs distribution table (i.e. environmental characteristic process), and pass to SON module.SON module is according to switching
Performance profile table determines the high-incidence region the HOF in scene, formulates optimisation strategy.Match in this method for the UE into the district occurred frequently HOF
Set specific RRC measurement parameter triggered time TTT and A3_Offset.Specific self-optimizing policy distribution is generated to rrc layer, RRC
RRC_Reconfiguration message is issued to UE, and UE executes new parameter configuration after receiving, corresponding performance indicator obtains excellent
Change and is promoted.
Environment information acquisition module in environment sensing SON entity is obtained from isomery cellular network rrc layer entity
HandoverManagementKPI (handover management Key Performance Indicator), i.e. HandoverFailure (handover failure),
Two kinds of network switching events of HandoverSuccess (handover success).What HandoverManagementKPI and previous step obtained
User location estimated result is the environmental information of required acquisition in this environment perception method.SON entity is obtained from rrc layer to be switched
KPI is realized by environment sensing SON interface.And the SON entity of network side will be established with user location estimation module E-SMLC
Data exchange interface obtains customer position information while recording KPI, obtains KPI geographical distribution situation after establishing association.Ring
Two kinds of environmental informations of HandoverManagementKPI and user location estimated result that border information acquisition module is got input
To environmental characteristic processing module, environmental information analysis processing is carried out, obtains that high frequency in current network area can be characterized comprehensively
The performance of handoffs geographical distribution table of failed handoff, and store to Environmental Information Feature information bank.
Step 201: in environment sensing SON performing environment information gathering process, environment information acquisition module passes through environment sense
Know SON interface and rrc layer establishes data exchange channel, whenever there is handover event in network, RRC will the handover event
Type (switch successfully or failure) and environment information acquisition module is reported to together with the corresponding UEid of the event.Environmental information
Acquisition module receives after handover event information immediately according to the UE identifier received to E-SMLC request current time UE
Location information, and combine the location information with handover event information, generate
HandoverEventInformationElement is stored in the data file in SON entity as environmental information element
HoPosition.dat。
Step 202: the environmental information element for having accumulated certain amount, being enough to characterize performance of handoffs within the scope of current network
Afterwards, these environmental informations are input to environmental characteristic processing module and carry out Data Analysis Services, obtain performance of handoffs geography point
Cloth table.In order to promote the operation efficiency in self-optimizing implementation procedure, save computing resource, environment sensing SON is to travelling performance KPI
Geographic profile information carries out rasterizing processing, is divided into network area according to the area of the current administrative network area SON multiple
Grid calculates corresponding switching self-optimizing weight later for each grid region.The weight can be directly with cutting in grid region
Change failure rate HOF/ (HOS+HOF) expression.If there is no any switching in certain region, weight is denoted as -1.All grid zones
After the completion of the HOFrate handover failure rate in domain calculates, if the HOFrate in certain region more than preset thresholding, such as 50%, then will
The zone marker is high frequency handover failure spot band.Treated, and performance of handoffs geographical distribution table is stored in file
HofGridDistribution.dat imports SON and configures self-optimizing module.
Step 203: middle SON configuration self-optimizing module imports environmental information data as parameter self-optimizing foundation.Network fortune
In row, SON entity configuration self-optimizing module once learns that some UE enters institute in performance of handoffs geographical distribution table from E-SMLC
The region high frequency HOF of mark, the as specific RRC measurement parameter TTT and A3_OFFSET of the UE decision making.New parameter value
Rrc layer protocol stack is handed down to by the handshake interface between SON entity and rrc layer.
After 204:RRC layers of step receive the RRC measurement parameter of the new decision of SON entity, generates one and new report with confidence
Interest statement member, configuration trigger type as event triggering type, and event type A3, triggered time TTT and A3 bias is received according to from SON
To parameter value configured, measurement amount is set as RSRP.Report other fields of configuration IE still according to original configuration.It reports and matches
After setting generation, RRC generates a MeasConfig measurement configuration information unit, reports configuration that measuring configuration is added for above-mentioned
In ReportConfigToAddModList queue.Finally, RRC encapsulates the MeasConfig to RRC reallocation message RRC_
In Reconfiguration, it is handed down to UE.Execution measurement reconfigures after UE receives RRC reallocation message, modifies the RRC of itself
Measurement parameter, so that from travelling performance promotion is obtained when moving in the region high frequency HOF.
Fig. 3 is that regular networking scene method implements front and back effect of optimization comparison.In figure it can be seen that collected switching
Logout carry out rasterizing after as a result, and execute optimization after performance of handoffs promoted effect.Before executing SON scheme,
Handover failure in UE moving process is concentrated mainly on scene center and disposes the region more concentrated.SON entity passes through acquisition point
Analyse the more accurate geographical distribution situation of the available handover event of environmental information.After executing the self-optimizing of SON parameter configuration, it can see
The HOF quantity of middle section is reduced out, and a degree of reduction can be obtained in handover failure rate.
Fig. 4 is that the free networking scene method of user implements front and back effect of optimization comparison.Assuming that the user in scene is at 7
Home eNodeB (SmallCell) is freely disposed on the basis of MacroCell, and is more concentratedly distributed.It is counted from handover event
In the figure as can be seen that distributed areas HOF are consistent with intensive SmallCell deployment region.Therefore this method can be arrived with Intellisense
Network topology change bring influences, and makes specific aim adjustment automatically, saves the artificial of traditional network configuration needs.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.?
After the content for having read record of the invention, technical staff can be made various changes or modifications the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (6)
1. a kind of handoff parameter self-configuration method based on the perception of high frequency failed handoff, it is characterised in that；Including following step
It is rapid:
In step 1) isomery cellular network, long time scale environment sensing SON entity is set in network side, specifically includes following son
Module: for carrying out environment sensing SON interface, the environment information acquisition module, environmental characteristic of information exchange with other protocol layers
Change processing module, environmental characteristic information bank and SON and configure self-optimizing module, the module is by Optimization Algorithms Library and aspect of network self-configuration mould
Block composition；UE position estimation module is enabled in network side simultaneously and carries out user location measurement, as the auxiliary of acquisition environmental information
Help equipment；
Environment information acquisition module in step 2) environment sensing SON entity is obtained from isomery cellular network rrc layer entity to be switched
Manage Key Performance Indicator, i.e. handover failure, two kinds of network switching events of handover success, handover management Key Performance Indicator and step
The environmental information that the rapid user location estimated result 1) obtained obtains needed for being；
The handover management Key Performance Indicator and user location estimated result two that step 3) gets environment information acquisition module
Kind environmental information is input to environmental characteristic processing module, carries out environmental information analysis processing, obtains characterizing comprehensively current
The performance of handoffs geographical distribution table of high frequency failed handoff in network area, and store to Environmental Information Feature information bank；
Step 4) is every a period of time, configuration self-optimizing module performance of handoffs geographical distribution table being directed into SON entity
As self-optimizing foundation, self-optimizing module formulates targetedly optimisation strategy according to the environment sensing result of back, if detection
Enter high frequency handover failure generation area to some position UE, then generates new RRC measuring configuration parameter triggered time TTT for it
With A3 bias；
Configuration parameter after optimization is issued to rrc layer by step 5) SON entity, and rrc layer generates RRC and reconfigure according to parameter value to disappear
Breath, is sent to corresponding UE, modifies the RRC measuring configuration of the UE, completes parameter configuration.
2. the handoff parameter self-configuration method according to claim 1 based on the perception of high frequency failed handoff, feature
It is；SON entity obtains handover management Key Performance Indicator from rrc layer and is realized by environment sensing SON interface in step 2), and
And the SON entity of network side will establish data exchange interface with user location estimation module E-SMLC, close in record handover management
Customer position information is obtained while key performance indicator, obtains handover management Key Performance Indicator geographical distribution feelings after establishing association
Condition.
3. the handoff parameter self-configuration method according to claim 1 or 2 based on the perception of high frequency failed handoff, special
Sign is；In step 2) environment sensing SON performing environment information gathering process, environment information acquisition module passes through environment sensing
SON interface and rrc layer establish data exchange channel, whenever there is handover event in network, RRC will the handover event kind
Class switches successfully or failure, and is reported to environment information acquisition module, environmental information together with the corresponding UEid of the event
Acquisition module receives after handover event information immediately according to the UE identifier received to E-SMLC request current time UE
Location information, and combine the location information with handover event information, generate
HandoverEventInformationElement is stored as environmental information element.
4. the handoff parameter self-configuration method according to claim 3 based on the perception of high frequency failed handoff, feature
It is；Environment information analysis treatment process is established after step 2) several long-times of continuous collecting environmental information in step 3),
These environmental informations are input to environmental characteristic processing module and carry out Data Analysis Services, obtain performance of handoffs geographical distribution
Table, environment sensing SON carry out rasterizing processing to travelling performance handover management Key Performance Indicator geographic profile information, according to
Network area is divided into multiple grids by the area of the current administrative network area SON, is later that each grid region is calculated and corresponded to
Switching self-optimizing weight；The weight can be indicated directly with the handover failure rate HOF/ (HOS+HOF) in grid region, if certain area
There is no any switchings in domain, then weight is denoted as -1, after the completion of the HOFrate handover failure rate of all grid regions calculates,
It is high frequency handover failure spot band by the zone marker if the HOFrate in certain region is more than preset thresholding；Treated
Performance of handoffs geographical distribution table imports SON and configures self-optimizing module.
5. the handoff parameter self-configuration method according to claim 4 based on the perception of high frequency failed handoff, feature
It is；SON configures self-optimizing module and imports environmental information data as parameter self-optimizing foundation in step 4) specifically: network fortune
In row, SON entity configuration self-optimizing module once learns some UE with entering the performance of handoffs that step 3) obtains from E-SMLC
The region high frequency HOF identified in reason distribution table, the as specific RRC measurement parameter TTT and A3_ of the UE decision making
OFFSET, new parameter value are handed down to rrc layer protocol stack by the handshake interface between SON entity and rrc layer.
6. the handoff parameter self-configuration method according to claim 4 based on the perception of high frequency failed handoff, feature
It is；In the step 5), after rrc layer receives the RRC measurement parameter of the new decision of SON entity, generates one and new report configuration
Information unit, configuration triggering type is event triggering type, and event type A3, triggered time TTT and A3 bias is according to from SON
The parameter value received is configured, and measurement amount is set as RSRP, is reported other fields of configuration IE still according to original configuration, is reported
After configuration generates, RRC generates a MeasConfig measurement configuration information unit, reports configuration that measuring configuration is added for above-mentioned
In ReportConfigToAddModList queue, finally, RRC encapsulates the MeasConfig to RRC reallocation message RRC_
In Reconfiguration, it is handed down to UE, execution measurement reconfigures after UE receives RRC reallocation message, modifies the RRC of itself
Measurement parameter.
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