CN102256318A - Adjustment method for handoff parameter - Google Patents
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Abstract
The invention provides an adjustment method for a handoff parameter, in which when UE (User Equipment) finishes RRC (Radio Resource Control) connection reestablishment in a reestablishment cell, the UE notifies the reestablishment cell of the mobile state information during handoff failure or radio link failure, then, the reestablishment cell notifies a base station in radio link failure (RLF) with the mobile state information, if the base station is not a source base station for handoff when the RLF happens, the reestablishment cell further notifies the source base station of the mobile state information, in this way, the source base station can adjust the handoff parameter at the current base station side according to the mobile state information of the UE, thereby solving the problem of improper configuration of the handoff parameter and further improving MRO (Mobile Robustness Optimization) performance.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of method of adjustment of handoff parameter.
Background technology
In the network in future, because different network coexisted, it is complicated more that network will become, and a large amount of wireless parameters and data will make network optimization personnel's workload significantly improve, and operator wishes to cut operating costs and manual intervention.So under this background, the self-organizing network of EUTRAN system (SON) characteristic is used as the important research direction of 3GPP.The main thought of SON is to realize some autonomic functions of wireless network, reduces manually participating in, and cuts operating costs.The research contents of SON comprises Automatic Neighboring Relation (ANR), physical district ID (PCI) selection, mobile robustness optimization (MRO) and moving load equilibrium (MLB) etc.MRO is used to solve handoff parameter inappropriate problem is set.Incorrect handoff parameter may cause rattling switching, handoff failure and Radio Link Failure (RLF), all influential to user experience and Internet resources.
At present, handoff failure comprises three kinds: spend evening and switch the failure that causes, switch the failure that causes and switch to the failure that wrong cell causes too early.
Cross the appearance of switching the failure that causes evening, normally because subscriber equipment (UE) moves too fast, it is improper that switching (HO) parameter is provided with, make the cell-of-origin signal weak excessively just trigger and switch, like this, will cause the appearance of Radio Link Failure (RLF) owing to signal a little less than excessively, this RLF took place before switching, just can not carry out handoff procedure again, thereby handoff failure occur.In addition, RLF takes place after, UE will initiate to carry out in new sub-district RRC connection reconstruction process.As seen, cross showing as of switching in evening: cell-of-origin RLF took place before HO triggers; UE rebuilds in other sub-district and connects.
Switch the appearance of the failure that causes too early, enter at UE normally that other sub-district occurs when the island of this sub-district type covers, it is very common that the island type covers dense city, at this moment, may occur after UE inserts Target cell RLF just having taken place soon, like this, UE can be that RRC connection reconstruction process is triggered in the cell-of-origin in this sub-district.As seen, cross showing as of switching in evening: behind the UE access Target cell RLF has just taken place soon; UE rebuilds in the cell-of-origin and connects.
Switch to the appearance of the failure that wrong cell causes, normally because the skew of sub-district individual character (Cell Individual Offset, CIO) be provided with improper, so will cause: though the time of switching is correct, but may switch to wrong sub-district, like this, RLF will take place in the sub-district of mistake in UE.The performance that switches to wrong cell can be summed up as: RLF has just taken place after inserting Target cell in UE soon; UE rebuilds in the sub-district that is different from cell-of-origin and Target cell and is connected.
In R9, propose some technology and realized MRO.Fig. 1-3 is the MRO handling process schematic diagram under above-mentioned three kinds of failed handoff scenario.As Figure 1-3, when the reconstruction incident takes place, UE rebuilds the reconstruction solicited message that the base station under the sub-district will be indicated the cell base station report UE of (RLF INDICATION) process service before UE by Radio Link Failure, the information of wherein carrying comprises the sub-district of service before the UE, in the UE of this Serving cell sign, and rebuild the sub-district that takes place.
Receive that the sub-district of RLF INDICATION can analyze the MRO type, then need not send subsequent message if cross the switching in evening, if switch too early or switch to wrong cell, then need to send handover report (HANDOVER REPORT) to the source base station that switches, be used to report the basic reason of a detected handoff failure problem, wherein carry the cell information that cell-of-origin, Target cell and generation are rebuild, this message is also indicated the reason (switch too early or switch to wrong cell) of the failure that is moved simultaneously.
As Figure 1-3, source base station may be adjusted handoff parameter when receiving RLF INDICATION or HANDOVER REPORT, and target BS among the figure and source base station are all for handoff procedure.
In addition, cover the existence of leak in actual applications, also can cause and spend evening switching identical performance, promptly RLF takes place after, UE initiates to carry out in new sub-district RRC connection reconstruction process.To switch evening and covered leak in order to distinguish, introduced in the existing system that UE reports the Reference Signal Received Power/Reference Signal Received Quality last in the cell-of-origin (RSRP/RSRQ) to collect this technology after RRC rebuilds.If the RSRP/RSRQ collection is single very little value, then may be for covering leak.On the contrary, if two or more values are arranged, have some also to judge that than the signal quality of system thresholding is big, then may to be that the HO parameter is provided with improper for reason.
Concrete mechanism is: when UE has preserved the relevant measurement of RLF, can be in the RRC connection reconstruction finish and carry RLF information available information (rlf-InfoAvailable) in (RRCConnectionReestablishmentComplete) message, this rlf-InfoAvailable is used to indicate current metrical information of having preserved when last time RLF taking place.After RRC rebuild successfully, the eNB that RRC rebuilds can ask UE transmission UE information response (UEInformationResponse) message to know these metrical informations.These information might need to be forwarded to the eNB that needs these information from the eNB that RRC rebuilds, i.e. source base station of Qie Huaning.Therefore, in RLF INDICATION, be provided with UE Radio Link Failure report container (UE RLF Report Container), so that these metrical informations are sent to the eNB that needs these information.
When RRC rebuilds reconstruction failure might take place, reason is to rebuild the sub-district not have UE context or other reasons, and these all can cause UE (IDLE) state that enters the free time.This scene can't send RLF INDICATION in R9, and source base station just can't carry out MRO according to the relevant metrical information of RLF like this.In R10, in order to support the MRO under this scene, when UE carries out RRC and connects when setting up rebuilding the sub-district, in RRCConnectionSetupComplete message, also can comprise rlf-InfoAvailable, after the RRC connection was set up successfully, eNB can ask UE to send some information that UE information response (UEInformationResponse) message is informed UE: the Target cell that RLF sub-district or HO take place; Carry out rebuilding for the first time the sub-district of attempting after the connection failure; Initiate the sub-district of HO at last; Be initiated to the time of connection failure from HO.
The RLF INDICATION that R10 uses is consistent with R9 with HANDOVER REPORT message structure.
When the source base station that switches is revised handoff parameter according to the MRO type, may revise and measure triggered time (timeToTrigger) parameter that reports in the configuration.The effect of triggered time parameter is: when the signal quality of the adjacent base station that receives is better than the signal quality of serving BS and time of being continued when reaching timeToTrigger, UE will trigger handoff procedure.And parametric t imeToTrigger is relevant with the UE translational speed, and the UE side can be adjusted according to the timeToTrigger of its translational speed to current preservation.Provided the UE mobile status parameter that in measuring configuration messages, is disposed in the table 1.
Table 1
UE one has three kinds of mobile statuss: normal condition, high-mobility state, middle mobile status.Normally, UE judges that mobile status of oneself and the method for adjustment timeToTrigger are: if during time t-Evaluation, the number that switch the sub-district surpasses n-CellChangeMedium, and above n-CellChangeHigh, then UE thinks and oneself has entered middle mobile status, and timeToTrigger be multiply by sf-Medium; If during time t-Evaluation, the sub-district is switched number and is surpassed n-CellChangeHigh, and then UE thinks that oneself has entered high-mobility state, multiply by sf-High with timeToTrigger.Also do not detect middle mobile status if both detected high-mobility state during t-HystNormal, then UE thinks that oneself has entered normal condition, timeToTrigger is not carried out convergent-divergent.
According to existing system, source base station is only known the type of handoff failure, and do not know UE mobile status information at that time, like this, how source base station can not be judged mobile robustness parameters optimization (promptly be used to switch timeToTrigger, sf-Medium and sf-High parameter) is adjusted, dispose inappropriate problem to solve handoff parameter, and then can't improve the MRO performance.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of adjustment of handoff parameter, and this method can solve handoff parameter and dispose inappropriate problem.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of method of adjustment of handoff parameter, this method may further comprise the steps:
A, when the radio resource control RRC connection reconstruction process of user equipment (UE) finishes, described UE is by the UE info response message, the mobile status information during with Radio Link Failure is notified to the base station node B _ Re under the reconstruction sub-district of described RRC connection reconstruction;
B, described base station node B _ Re pass through Radio Link Failure RLF Indication message, the base station node B _ RLF when described mobile status information is notified to the Radio Link Failure generation under the described UE, and described RRC connection reconstruction process is triggered by described Radio Link Failure;
C, described base station node B _ RLF determine the reason of described Radio Link Failure;
If d is described former because switch too early, then described base station node B _ RLF is notified to described mobile status information by handover report message the source base station NodeB_S2 of described UE when described too early the switching taken place, handoff failure has taken place and when needing to adjust described handoff parameter judging that described UE is current in described base station node B _ S2, according to described mobile status information described handoff parameter is adjusted, described handoff parameter comprises time To Trigger parameter, sf-High parameter and sf-Medium parameter.
If it is described former because cross the switching in evening, handoff failure has taken place and when needing to adjust described handoff parameter, according to described mobile status information described handoff parameter has been adjusted judging that described UE is current in the base station when then Radio Link Failure takes place under the described UE.
In sum, the method of adjustment of a kind of handoff parameter that the present invention proposes, after the RRC connection re-establishment that UE carries out in the reconstruction sub-district is finished, mobile status information during with handoff failure or Radio Link Failure is notified to this reconstruction sub-district, rebuild the base station that the sub-district is notified to this mobile status information place when RLF takes place again, if the base station at place was not the source base station that switches when RLF took place, then again this mobile status information is notified to source base station, like this, source base station can be adjusted the handover configurations parameter of current base station side according to the mobile status information of UE, thereby can solve handoff parameter and dispose inappropriate problem, and then improve the MRO performance.
Description of drawings
Fig. 1 is the MRO handling process schematic diagram of crossing in the existing system under the late failed handoff scenario;
Fig. 2 is the MRO handling process schematic diagram under the too early failed handoff scenario in the existing system;
Fig. 3 is the MRO handling process schematic diagram under the situation that switches to wrong cell in the existing system;
Fig. 4 is the schematic flow sheet of the embodiment of the invention one.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: after the RRC connection re-establishment that UE carries out in the reconstruction sub-district is finished, mobile status information during with handoff failure or Radio Link Failure is notified to this reconstruction sub-district, rebuild the sub-district this mobile status information is directly used or be notified to source base station, like this, source base station can be adjusted the handover configurations parameter of current base station side according to the mobile status information of UE, thereby can solve handoff parameter and dispose inappropriate problem, and then improve the MRO performance.
Fig. 4 is the schematic flow sheet of the embodiment of the invention one, and as shown in Figure 4, this embodiment mainly may further comprise the steps:
Here need to prove that UE will initiate RRC connection reconstruction process when Radio Link Failure takes place.
Here, determine that the concrete grammar of described failure cause is grasped by those skilled in the art, do not repeat them here.
If step 404 is described former because switch too early, then described base station node B _ RLF is notified to described mobile status information by handover report message the source base station NodeB_S2 of described UE when described too early the switching taken place, handoff failure has taken place and when needing to adjust described handoff parameter judging that described UE is current in described base station node B _ S2, according to described mobile status information described handoff parameter is adjusted, described handoff parameter comprises time To Trigger parameter, sf-High parameter and sf-Medium parameter.
If it is described former because cross the switching in evening, handoff failure has taken place and when needing to adjust described handoff parameter, according to described mobile status information described handoff parameter has been adjusted judging that described UE is current in the base station when then Radio Link Failure takes place under the described UE.
The base station at UE place before described source base station NodeB_S2 is meant and switches.
Particularly, when described former because when switching too early, the concrete grammar that described base station node B _ S2 adjusts described handoff parameter according to described mobile status information can may further comprise the steps:
Step 4051, according to the mobile status information of the current N that a receives UE, determine wherein high-mobility state, middle mobile status and the shared separately percentage of normal condition.
If the shared percentage of the described high-mobility state of step 4052 is greater than preset threshold value M, judge that then whether current sf-High parameter is less than default sf-High max-thresholds, if, the sf-High parameter is raised one-level, otherwise, increase described time To Trigger parameter value, described M＞50%; The described adjustment process of end step 405; If the shared percentage of described high-mobility state is not more than preset threshold value M, then execution in step 4053.
If the shared percentage of mobile status was greater than described threshold value M during step 4053 was described, judge that then whether current sf-Medium parameter is less than default sf-Medium max-thresholds, if, then the sf-Medium parameter is raised one-level, otherwise, increase described time To Trigger parameter value; The described adjustment process of end step 405; If the shared percentage of mobile status is not more than described threshold value M in described, then execution in step 4054.
If the shared percentage of the described normal condition of step 4054 is greater than described threshold value M, then according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is adjusted time To Trigger parameter value, TTT is the time To Trigger parameter before adjusting, sfM ' is adjusted sf-Medium parameter value, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is adjusted sf-High parameter value, and sfH is the sf-High parameter value before adjusting; If the shared percentage of described normal condition is not more than described threshold value M, then increase described time To Trigger parameter value.
Preferably, when described former because when spending evening and switching, the concrete grammar that the base station when Radio Link Failure takes place under the described UE is adjusted described handoff parameter according to described mobile status information can for:
Step 4061, according to the mobile status information of the current N that a receives UE, determine wherein high-mobility state, middle mobile status and the shared separately percentage of normal condition.
If the shared percentage of the described high-mobility state of step 4062 is greater than preset threshold value M, judge that then whether current sf-High parameter is greater than default sf-High minimum threshold, if, with sf-High parameter downward modulation one-level, otherwise, reduce described time To Trigger parameter value, described M＞50%; The described adjustment process of end step 406; If the shared percentage of described high-mobility state is not more than preset threshold value M, then execution in step 4063.
Here, if the shared percentage of described high-mobility state greater than preset threshold value M, then explanation is most of spends evening and switches the UE that occurs in high-mobility state, therefore should reduce sf-High.At this moment, if sf-High is not a minimum value, then to the downward modulation one-level (for example with sf-High, drop to 0.5 from 0.75, or drop to 0.25 from 0.5, down with), otherwise reduce timeToTrigger, the concrete degree that reduces can be provided with according to actual needs by those skilled in the art.
If the shared percentage of mobile status was greater than described threshold value M during step 4063 was described, judge that then whether current sf-Medium parameter is greater than default sf-Medium minimum threshold, if, then with sf-Medium parameter downward modulation one-level, otherwise, reduce described time To Trigger parameter value; The described adjustment process of end step 406; If the shared percentage of mobile status is not more than described threshold value M in described, then execution in step 4064.
Here, if the shared percentage of mobile status is greater than described threshold value M in described, then explanation most of spend evening and switch occur in the UE of mobile status, therefore should reduce sf-Medium.If sf-Medium is not a minimum value, then with sf-Medium to the downward modulation one-level, otherwise reduce timeToTrigger, the concrete degree that reduces can be provided with according to actual needs by those skilled in the art.
If the shared percentage of the described normal condition of step 4064 is greater than described threshold value M, then according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is adjusted time To Trigger parameter value, TTT is the time To Trigger parameter before adjusting, sfM ' is adjusted sf-Medium parameter value, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is adjusted sf-High parameter value, and sfH is the sf-High parameter value before adjusting; If the shared percentage of described normal condition is not more than described threshold value M, then reduce described time To Trigger parameter value.
Here, if the shared percentage of described normal condition greater than described threshold value M, then explanation is most of spends evening and switches the UE that occurs in normal condition.Wherein formula (1) is in order to reduce the timeToTrigger of normal condition UE, and formula (2), (3) be for the timeToTrigger that keeps high-mobility state and middle mobile status constant substantially.
The shared percentage of described normal condition is not more than described threshold value M, and the UE that various mobile statuss then are described can take place to switch evening, and should reduce timeToTrigger this moment, and the concrete degree that reduces can be provided with according to actual needs by those skilled in the art.
Need to prove, when described former because when switching to wrong cell, then can adopt and the operation together of existing method, be that base station node B _ RLF sends handover report message to described UE is current under switching during wrong cell base station node B _ S1, handoff failure has taken place and when needing to adjust described handoff parameter judging that described UE is current in described base station node B _ S1, described handoff parameter is adjusted, and this adjustment this moment does not need the mobile status information according to UE.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the method for adjustment of a handoff parameter is characterized in that, this method may further comprise the steps:
A, when the radio resource control RRC connection reconstruction process of user equipment (UE) finishes, described UE is by the UE info response message, the mobile status information during with Radio Link Failure is notified to the base station node B _ Re under the reconstruction sub-district of described RRC connection reconstruction;
B, described base station node B _ Re pass through Radio Link Failure RLF Indication message, the base station node B _ RLF when described mobile status information is notified to the Radio Link Failure generation under the described UE, and described RRC connection reconstruction process is triggered by described Radio Link Failure;
C, described base station node B _ RLF determine the reason of described Radio Link Failure;
If d is described former because switch too early, then described base station node B _ RLF is notified to described mobile status information by handover report message the source base station NodeB_S2 of described UE when described too early the switching taken place, handoff failure has taken place and when needing to adjust described handoff parameter judging that described UE is current in described base station node B _ S2, according to described mobile status information described handoff parameter is adjusted, described handoff parameter comprises time To Trigger parameter, sf-High parameter and sf-Medium parameter.
If it is described former because cross the switching in evening, handoff failure has taken place and when needing to adjust described handoff parameter, according to described mobile status information described handoff parameter has been adjusted judging that described UE is current in the base station when then Radio Link Failure takes place under the described UE.
2. method according to claim 1 is characterized in that, when described former because when spending evening and switching, describedly according to described mobile status information described handoff parameter adjustment is comprised:
Fx1, according to the mobile status information of the current N that a receives UE, determine wherein high-mobility state, middle mobile status and the shared separately percentage of normal condition;
If the shared percentage of the described high-mobility state of fx2 is greater than preset threshold value M, judge that then whether current sf-High parameter is greater than default sf-High minimum threshold, if, with sf-High parameter downward modulation one-level, otherwise, reduce described time To Trigger parameter value, described M＞50%; Finish described adjustment process; If the shared percentage of described high-mobility state is not more than preset threshold value M, then execution in step fex3;
If the shared percentage of mobile status was greater than described threshold value M during fx3 was described, whether then judge current sf-Medium parameter greater than default sf-Medium minimum threshold, if, then with sf-Medium parameter downward modulation one-level, otherwise, reduce described time To Trigger parameter value; Finish described adjustment process; If the shared percentage of mobile status is not more than described threshold value M in described, then execution in step fx4;
If the shared percentage of the described normal condition of fx4 is greater than described threshold value M, then according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is adjusted time To Trigger parameter value, TTT is the time To Trigger parameter before adjusting, sfM ' is adjusted sf-Medium parameter value, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is adjusted sf-High parameter value, and sfH is the sf-High parameter value before adjusting; If the shared percentage of described normal condition is not more than described threshold value M, then reduce described time To Trigger parameter value.
3. method according to claim 1 is characterized in that, when described former because when switching too early, describedly according to described mobile status information described handoff parameter adjustment is comprised:
Ex1, according to the mobile status information of the current N that a receives UE, determine wherein high-mobility state, middle mobile status and the shared separately percentage of normal condition;
If the shared percentage of the described high-mobility state of ex2 is greater than preset threshold value M, judge that then whether current sf-High parameter is less than default sf-High max-thresholds, if, the sf-High parameter is raised one-level, otherwise, increase described time To Trigger parameter value, described M＞50%; Finish described adjustment process; If the shared percentage of described high-mobility state is not more than preset threshold value M, then execution in step ex3;
If the shared percentage of mobile status was greater than described threshold value M during ex3 was described, whether then judge current sf-Medium parameter less than default sf-Medium max-thresholds, if then the sf-Medium parameter is raised one-level, otherwise, increase described time To Trigger parameter value; Finish described adjustment process; If the shared percentage of mobile status is not more than described threshold value M in described, then execution in step ex4;
If the shared percentage of the described normal condition of ex4 is greater than described threshold value M, then according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is adjusted time To Trigger parameter value, TTT is the time To Trigger parameter before adjusting, sfM ' is adjusted sf-Medium parameter value, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is adjusted sf-High parameter value, and sfH is the sf-High parameter value before adjusting; If the shared percentage of described normal condition is not more than described threshold value M, then increase described time To Trigger parameter value.
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