CN102256318B - 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 following network, due to different network coexisted, it is more complicated 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 and participates 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 balanced (MLB) etc.MRO arranges inappropriate problem for solving handoff parameter.Incorrect handoff parameter may cause pingpang handoff, handoff failure and Radio Link Failure (RLF), all influential to user's experience and Internet resources.
At present, handoff failure comprises three kinds: the failure that failed, the too early switching of spending evening switching causing causes and be switched to the failure that wrong cell causes.
Cross the appearance of the failure that switching causes in evening, normally because subscriber equipment (UE) is mobile too fast, it is improper that switching (HO) parameter arranges, make the cell-of-origin signal excessively weak just trigger switching, like this, will cause the appearance of Radio Link Failure (RLF) a little less than excessively due to signal, this RLF occurred before switching, just can not carry out again handoff procedure, thereby handoff failure occur.In addition, after RLF occurs, UE will initiate the Xin community and carry out RRC connection reconstruction process.Visible, cross showing as of switching in evening: cell-of-origin RLF occurred before HO triggers; UE rebuilds and connects in other community.
The appearance of the failure that switching causes too early, the island type that normally at UE, enters Zhe community, other community occurs while covering, it is very common that the island type covers dense city, now, may occur, after UE access Target cell, RLF has just occurred soon, like this, UE Hui Gai community is that RRC connection reconstruction process is triggered in cell-of-origin.Visible, cross showing as of switching in evening: after UE access Target cell, RLF has just occurred soon; UE rebuilds and connects in cell-of-origin.
Be switched to the appearance of the failure that wrong cell causes, normally due to community individual character skew (Cell Individual Offset, CIO) arrange improper, so will cause: although the time of switching is correct, but may switch to wrong community, like this, RLF will occur in wrong community in UE.The performance that is switched to wrong cell can be summed up as: after UE access Target cell, RLF has just occurred soon; UE rebuilds and is connected in the community that is different from cell-of-origin and Target cell.
Proposed some technology and realized MRO in R9.Fig. 1-3 are the MRO handling process schematic diagram under above-mentioned three kinds of failed handoff scenario.As Figure 1-3, when the reconstruction event occurs, the reconstruction solicited message of (RLF INDICATION) process to the cell base station report UE of UE service before will be indicated by Radio Link Failure in the base station that UE rebuilds under community, the information of wherein carrying comprises the community of service before UE, in the UE of this Serving cell sign, and rebuild the community occurred.
Receive that the community of RLF INDICATION can analyze the MRO type, do not need to send subsequent message if cross the switching in evening, if switch too early or be switched to wrong cell, need to send handover report (HANDOVER REPORT) to the source base station of switching, for reporting the basic reason of a handoff failure problem detected, 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 be switched to wrong cell) of the failure that is moved simultaneously.
As Figure 1-3, source base station, when receiving RLF INDICATION or HANDOVER REPORT, may be adjusted handoff parameter, and the target BS in figure and source base station are all for handoff procedure.
In addition, cover in actual applications the existence of leak, also can cause the performance identical with crossing the switching in evening, after RLF occurring, UE initiates the Xin community and carries out RRC connection reconstruction process.In order to distinguish the switching in evening and to cover leak, introduced UE after RRC rebuilds in existing system and reported the Reference Signal Received Power/Reference Signal Received Quality last in cell-of-origin (RSRP/RSRQ) to collect this technology.If the RSRP/RSRQ collection is single very little value, may be for covering leak.On the contrary, if two or more values are arranged, have some also large than the signal quality of system judgement thresholding, may to be that the HO parameter arranges improper for reason.
Concrete mechanism is: when UE has preserved the relevant measurement of RLF, can complete in (RRCConnectionReestablishmentComplete) message the RLF Information Availability information (rlf-InfoAvailable) of carrying in the RRC connection reconstruction, this rlf-InfoAvailable is used to indicate current metrical information of having preserved while last time RLF occurring.After RRC rebuilds successfully, the eNB that RRC rebuilds can ask UE transmission UE information response (UEInformationResponse) message to know these metrical informations.The eNB that these information likely need to be rebuild from RRC is forwarded to the eNB that needs these information, i.e. the source base station of switching.Therefore, be provided with UE Radio Link Failure report container (UE RLF Report Container) in RLF INDICATION, in order to these metrical informations are sent to the eNB that needs these information.
Reconstruction failure likely occurs when RRC rebuilds, and reason is to rebuild community there is no UE context or other reasons, and these all can cause UE (IDLE) state that enters the free time.In R9, this scene can't send RLF INDICATION, and the metrical information that source base station just can't be relevant according to RLF is like this carried out MRO.In R10, in order to support the MRO under this scene, carry out RRC connects while setting up as UE in the reconstruction community, also can comprise rlf-InfoAvailable in RRCConnectionSetupComplete message, after the RRC connection is successfully established, eNB can ask UE to send some information that UE information response (UEInformationResponse) message is informed UE: the Target cell that RLF community or HO occur; Rebuild for the first time the community of trial after connection failure; Finally initiate the HO community; Be initiated to the time of connection failure from HO.
The RLF INDICATION that R10 is used is consistent with R9 with HANDOVER REPORT message structure.
When the source base station of switching is revised handoff parameter according to the MRO type, may revise to measure reporting triggered time (timeToTrigger) parameter in configuration.The effect of triggered time parameter is: when the signal quality of the adjacent base station received is better than the signal quality of serving BS and duration while reaching timeToTrigger, UE will trigger handoff procedure.And parametric t imeToTrigger is relevant with the UE translational speed, the UE side can be adjusted by the timeToTrigger to current preservation according to its translational speed.Provided the UE mobile status parameter configured in table 1 in measuring configuration messages.
Table 1
UE mono-has three kinds of mobile statuss: normal condition, high-mobility state, middle mobile status.Normally, the mobile status of UE judgement oneself and the method for adjustment timeToTrigger are: if during time t-Evaluation, the number of community switching surpasses n-CellChangeMedium, and over n-CellChangeHigh, UE thinks and oneself has entered middle mobile status, and timeToTrigger is multiplied by sf-Medium; If during time t-Evaluation, community switching number surpasses n-CellChangeHigh, and UE thinks that oneself has entered high-mobility state, is multiplied by sf-High by timeToTrigger.Also do not detect middle mobile status if both detected high-mobility state during t-HystNormal, UE thinks that oneself has entered normal condition, timeToTrigger is not carried out to 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, source base station can not judge how mobile robustness Optimal Parameters (i.e. timeToTrigger, sf-Medium and sf-High parameter for switching) is adjusted, configure 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 the method can solve handoff parameter and configure inappropriate problem.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A kind of method of adjustment of handoff parameter, the method comprises the following 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 by Radio Link Failure is notified to the base station node B _ Re under the reconstruction community of described RRC connection reconstruction;
B, described base station node B _ Re be by Radio Link Failure RLF Indication message, by described mobile status information, notifies the base station node B _ RLF under described UE while occurring to Radio Link Failure, 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 switching too early, the source base station NodeB_S2 of described UE when described base station node B _ RLF notifies to the described too early switching of generation by handover report message by described mobile status information, handoff failure has occurred and while 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 described former because cross the switching in evening, handoff failure has occurred and while 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 base station when Radio Link Failure occurs under described UE.
In sum, the method of adjustment of a kind of handoff parameter that the present invention proposes, when UE is rebuilding after the RRC connection re-establishment of carrying out community completes, mobile status information during by handoff failure or Radio Link Failure is notified to this reconstruction community, the base station at place when the reconstruction community is notified this mobile status information to generation RLF again, if when RLF occurs, the base station at place is not the source base station of switching, 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 configure inappropriate problem, and then raising MRO performance.
The accompanying drawing explanation
Fig. 1 crosses the MRO handling process schematic diagram under late failed handoff scenario in existing system;
Fig. 2 is the MRO handling process schematic diagram under too early failed handoff scenario in existing system;
Fig. 3 is the MRO handling process schematic diagram be switched in existing system in the situation of wrong cell;
The schematic flow sheet that Fig. 4 is the embodiment of the present 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: when UE is rebuilding after the RRC connection re-establishment of carrying out community completes, mobile status information during by handoff failure or Radio Link Failure is notified to this reconstruction community, rebuilding community directly uses this mobile status information or notifies 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 configure inappropriate problem, and then improve the MRO performance.
The schematic flow sheet that Fig. 4 is the embodiment of the present invention one, as shown in Figure 4, this embodiment mainly comprises the following steps:
Here it should be noted that UE will initiate RRC connection reconstruction process when Radio Link Failure occurs.
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 switching too early, the source base station NodeB_S2 of described UE when described base station node B _ RLF notifies to the described too early switching of generation by handover report message by described mobile status information, handoff failure has occurred and while 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 described former because cross the switching in evening, handoff failure has occurred and while 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 base station when Radio Link Failure occurs under described UE.
Described source base station NodeB_S2 refers to the base station at the front UE of switching place.
Particularly, when described former because too early switching, the concrete grammar that described base station node B _ S2 is adjusted described handoff parameter according to described mobile status information can comprise the following steps:
Step 4051, according to the mobile status information of the current N a received UE, determine wherein high-mobility state, middle mobile status and normal condition shared percentage separately.
If the shared percentage of the described high-mobility state of step 4052 is greater than default threshold value M, judge whether current sf-High parameter is less than default sf-High max-thresholds, if, the sf-High parameter is raised to one-level, otherwise, increase described time To Trigger parameter value, described M>50%; The described adjustment process of ending step 405; If the shared percentage of described high-mobility state is not more than default threshold value M, perform step 4053.
If the shared percentage of the described middle mobile status of step 4053 is greater than described threshold value M, judge whether current sf-Medium parameter is less than default sf-Medium max-thresholds, if, the sf-Medium parameter is raised to one-level, otherwise, increase described time To Trigger parameter value; The described adjustment process of ending step 405; If the shared percentage of described middle mobile status is not more than described threshold value M, perform step 4054.
If the shared percentage of the described normal condition of step 4054 is greater than described threshold value M, according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is the time To Trigger parameter value after adjusting, TTT is the time To Trigger parameter before adjusting, sfM ' is the sf-Medium parameter value after adjusting, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is the sf-High parameter value after adjusting, 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, increase described time To Trigger parameter value.
Preferably, when described former because while crossing the evening switching, the concrete grammar that base station when Radio Link Failure occurs under described UE is adjusted described handoff parameter according to described mobile status information can be:
Step 4061, according to the mobile status information of the current N a received UE, determine wherein high-mobility state, middle mobile status and normal condition shared percentage separately.
If the shared percentage of the described high-mobility state of step 4062 is greater than default threshold value M, judge whether current sf-High parameter is greater than default sf-High minimum threshold, if, the sf-High parameter is lowered to one-level, otherwise, reduce described time To Trigger parameter value, described M>50%; The described adjustment process of ending step 406; If the shared percentage of described high-mobility state is not more than default threshold value M, perform step 4063.
Here, if the shared percentage of described high-mobility state is greater than default threshold value M, explanation major part is crossed the UE that the switching in evening occurs in high-mobility state, therefore should reduce sf-High.Now, for example, if sf-High is not minimum value, by sf-High to the downward one-level (, drop to 0.5 from 0.75, or drop to 0.25 from 0.5, lower with), otherwise reduce timeToTrigger, the concrete degree that reduces, can be arranged according to actual needs by those skilled in the art.
If the shared percentage of the described middle mobile status of step 4063 is greater than described threshold value M, judge whether current sf-Medium parameter is greater than default sf-Medium minimum threshold, if, the sf-Medium parameter is lowered to one-level, otherwise, reduce described time To Trigger parameter value; The described adjustment process of ending step 406; If the shared percentage of described middle mobile status is not more than described threshold value M, perform step 4064.
Here, if the shared percentage of described middle mobile status is greater than described threshold value M, explanation major part is crossed the UE that the switching in evening occurs in middle mobile status, therefore should reduce sf-Medium.If sf-Medium is not minimum value, by sf-Medium to lowering one-level, otherwise reduce timeToTrigger, the concrete degree that reduces, can be arranged 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, according to
Sf-High parameter and sf-Medium parameter, wherein, TTT ' is the time To Trigger parameter value after adjusting, TTT is the time To Trigger parameter before adjusting, sfM ' is the sf-Medium parameter value after adjusting, sfM ' is the sf-Medium parameter value before adjusting, and sfH ' is the sf-High parameter value after adjusting, 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, reduce described time To Trigger parameter value.
Here, if the shared percentage of described normal condition is greater than described threshold value M, explanation major part is crossed the UE that the switching in evening occurs in normal condition.Wherein formula (1) is in order to reduce the timeToTrigger of normal condition UE, and that formula (2), (3) are timeToTrigger in order to keep high-mobility state and middle mobile status is substantially constant.
The shared percentage of described normal condition is not more than described threshold value M, and the switching in evening can occur the UE that various mobile statuss are described, now should reduce timeToTrigger, and the concrete degree that reduces, can be arranged according to actual needs by those skilled in the art.
It should be noted that, when described former because while being switched to wrong cell, can adopt the operation same with 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 occurred and while 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 now this adjustment does not need the mobile status information according to UE.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the method for adjustment of a handoff parameter, is characterized in that, the method comprises the following 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 by Radio Link Failure is notified to the base station node B _ Re under the reconstruction community of described RRC connection reconstruction;
B, described base station node B _ Re be by Radio Link Failure RLF Indication message, by described mobile status information, notifies the base station node B _ RLF under described UE while occurring to Radio Link Failure, 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 switching too early, the source base station NodeB_S2 of described UE when described base station node B _ RLF notifies to the described too early switching of generation by handover report message by described mobile status information, handoff failure has occurred and while 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 described former because cross the switching in evening, handoff failure has occurred and while 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 base station when Radio Link Failure occurs under described UE;
When described former because while crossing the evening 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 a received UE, determine wherein high-mobility state, middle mobile status and normal condition shared percentage separately;
If the shared percentage of the described high-mobility state of fx2 is greater than default threshold value M, judge whether current sf-High parameter is greater than default sf-High minimum threshold, if, the sf-High parameter is lowered to 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 default threshold value M, perform step fex3;
If the shared percentage of the described middle mobile status of fx3 is greater than described threshold value M, judge whether current sf-Medium parameter is greater than default sf-Medium minimum threshold, if so, the sf-Medium parameter is lowered to one-level, otherwise, reduce described time To Trigger parameter value; Finish described adjustment process; If the shared percentage of described middle mobile status is not more than described threshold value M, perform step fx4;
If the shared percentage of the described normal condition of fx4 is greater than described threshold value M, according to
adjust described time To Trigger parameter, sf-High parameter and sf-Medium parameter, wherein, TTT ' is the time To Trigger parameter value after adjusting, TTT is the time To Trigger parameter before adjusting, sfM ' is the sf-Medium parameter value after adjusting, sfM is the sf-Medium parameter value before adjusting, and sfH ' is the sf-High parameter value after adjusting, 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, reduce described time To Trigger parameter value.
2. method according to claim 1, is characterized in that, when described former because too early switching, describedly according to described mobile status information, described handoff parameter adjustment comprised:
Ex1, according to the mobile status information of the current N a received UE, determine wherein high-mobility state, middle mobile status and normal condition shared percentage separately;
If the shared percentage of the described high-mobility state of ex2 is greater than default threshold value M, judge whether current sf-High parameter is less than default sf-High max-thresholds, if, the sf-High parameter is raised to 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 default threshold value M, perform step ex3;
If the shared percentage of the described middle mobile status of ex3 is greater than described threshold value M, judge whether current sf-Medium parameter is less than default sf-Medium max-thresholds, if so, the sf-Medium parameter is raised to one-level, otherwise, increase described time To Trigger parameter value; Finish described adjustment process; If the shared percentage of described middle mobile status is not more than described threshold value M, perform step ex4;
If the shared percentage of the described normal condition of ex4 is greater than described threshold value M, according to
adjust described time To Trigger parameter, sf-High parameter and sf-Medium parameter, wherein, TTT ' is the time To Trigger parameter value after adjusting, TTT is the time To Trigger parameter before adjusting, sfM ' is the sf-Medium parameter value after adjusting, sfM is the sf-Medium parameter value before adjusting, and sfH ' is the sf-High parameter value after adjusting, 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, increase described time To Trigger parameter value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010094236A1 (en) * | 2009-02-20 | 2010-08-26 | 华为技术有限公司 | Method, apparatus and system for locating wireless network problem |
| CN101841835A (en) * | 2009-03-17 | 2010-09-22 | 大唐移动通信设备有限公司 | Switching optimization method, equipment and system |
| CN102026309B (en) * | 2009-09-10 | 2013-07-31 | 电信科学技术研究院 | Method, system and device for detecting mobile state of terminal |
| CN102036243A (en) * | 2009-09-29 | 2011-04-27 | 北京三星通信技术研究有限公司 | Methods for processing radio link failure report and methods for adjusting mobile parameters |
| CN102098712A (en) * | 2011-03-24 | 2011-06-15 | 东南大学 | Handoff parameter self-optimization method in mobile communication system |
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