CN101635942B - Mobile robustness optimization method by introducing UE specific handoff parameter - Google Patents

Mobile robustness optimization method by introducing UE specific handoff parameter Download PDF

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CN101635942B
CN101635942B CN2009100902809A CN200910090280A CN101635942B CN 101635942 B CN101635942 B CN 101635942B CN 2009100902809 A CN2009100902809 A CN 2009100902809A CN 200910090280 A CN200910090280 A CN 200910090280A CN 101635942 B CN101635942 B CN 101635942B
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洪佩琳
铁晓磊
薛开平
张�浩
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University of Science and Technology of China USTC
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Abstract

The invention provides a mobile robustness optimization enhancing method (USP_MRO: User Specific Parameters in MRO) in a Long Term Evolution ADSL (LTE-A) system, comprising the following steps: introducing UE specific handoff parameters aiming to a certain characteristic which is specific to UE and influences the handoff performance in mobile robustness optimization, and maintaining different handoff parameters for the UE with different characteristics by each base station; except for common handoff parameters, also informing a plurality of UE specific handoff parameters to the UE by eNB after accessing a certain UE to eNB; and selecting a proper UE specific handoff parameter for use by the UE according to self characteristics during handoff. The invention considers the UE characteristics influencing the handoff effect into the mobile robustness optimization by introducing the UE specific handoff parameters in the mobile robustness optimization, thereby greatly increasing the success probability of handoff and preferably realizing the mobile robustness optimization.

Description

Introduce the mobile robustness optimization method of UE specific handoff parameter
Technical field
The present invention relates to moving communicating field, the optimization method of the mobile robustness optimization MRO in the LTE-A system of particularly a kind of Long Term Evolution broadband (Mobility Robustness Optimization).
Background technology
In the 2G/3G system, switching (HO:Handoff) parameter manually is provided with by Virtual network operator, this is an extremely time-consuming procedure, and the dynamic of the mode of this manual configuration handoff parameter is relatively poor, very easily causes handoff failure or the Radio Link inefficacy (RLF:Radio Link Failure) of UE (User Equipment) when change of network environment.
In order to address the above problem, 3GPP TR 36.902 has introduced the function of mobile robustness optimization (MRO:Mobility Robustness Optimization) in LTE and LTE Advanced system.In mobile robustness optimization, a Radio Link inefficacy of the every generation of UE (RLF) or handoff failure, will send Radio Link and lose efficacy report (RLF Report) to corresponding eNB, eNB can analyze the report of losing efficacy of the Radio Link received, and by mutual interactive cooperation finish the adjustment of handoff parameter separately.Mobile robustness optimization makes each eNB dynamically to adjust own handoff parameter with the optimization handoff procedure according to the situation that Radio Link lost efficacy and handoff failure takes place, and makes the user obtain best service.At present, TR 36.902 clearly proposes the following handoff parameter of mobile robustness optimization reply and is optimized:
·Hysteresis(Hyst)；
·Time?to?Trigger(TTT)；
·Cell?Individual?Offset(CIO)；
·Cell?reselection?parameters；
The principle of mobile robustness optimization MRO can be illustrated with following example: as Fig. 1, as the signal strength signal intensity M of the current service eNB of UE (SeNB:Serving eNB) s(NeNB:Neighbor eNB, this NeNB of supposition that is without loss of generality is j the neighbor cell of current SeNB, is designated as NeNB with certain neighbours eNB j) signal strength signal intensity
Figure G2009100902809D00011
Between will trigger when satisfying the concerning of inequality (1) the A3 incident (the A3 incident be trigger UE from current SeNB to NeNB jThe trigger condition of switching), the Hyst in the inequality (1) wherein sSluggish parameter (Hysteresis) on the current SeNB of expression UE,
Figure G2009100902809D00012
The respective neighbours base station NeNB that the current SeNB of expression UE safeguards jSub-district offset parameter (Cell Individual Offset).These parameters UE can directly read after setting up being connected with the RRC of SeNB.If the Hyst on the SeNB s,
Figure G2009100902809D00013
Value makes the handoff error (or RLF) that then can cause Too late type too late of A3 Event triggered; If the Hyst on the SeNB s, Value makes the handoff error (or RLF) that then can cause too early Too early type of A3 Event triggered.Switching for fear of these failures takes place, in common mobile robustness optimization (Normal MRO), eNB will lose efficacy to the Radio Link that each UE reports and report that (RLF Report) analyzed, and by mutual interactive cooperation the type (possible type has: Too early HO, Too late HO, To wrong HO) of RLF is judged, and come this SeNB is gone up the respective neighbours sub-district NeNB that safeguards according to the result of determination of RLF type jThe sub-district bias
Figure G2009100902809D00022
Dynamically adjust, minimizing the number of times that handoff failure and RLF take place, thereby optimize handoff procedure.
M n j > M s + Hyst s - CIO s , n j - - - ( 1 )
At present in the discussion of 3GPP RAN3, above-mentioned optimised parameter remains at defining between eNB.For example all UE on the current service eNB use same Hyst s, (be without loss of generality and be assumed to be NeNB for switching to certain identical neighbours eNB j) all UE also use same
Figure G2009100902809D00024
Value.Yet the handoff parameter that in fact satisfies the mobile robustness optimization requirement should be closely-related with the UE customizing messages.For example to moderate rate UE appropriate H yst sWith
Figure G2009100902809D00025
Be worth, then probably cause the handoff failure (or RLF) of too late type for the UE of two-forty.Therefore, the UE for different rates takes identical Hyst sWith Value is irrational.So need a kind of method to address the above problem.
Summary of the invention
Purpose of the present invention is intended to solve above-mentioned technological deficiency, promptly solve and in handoff procedure and mobile robustness optimization, do not consider and switch closely-related UE characteristic and bring the problem of handoff failure, promptly solve problem owing to the handoff failure that all UE that switch to certain identical neighbours eNB is used identical handoff parameter cause.
In order to achieve the above object, the present invention proposes a kind of mobile robustness optimization method (brief note is USP_MRO:UE Specific Parameter in MRO) of the UE of introducing specific handoff parameter, comprise with the lower part: in mobile robustness optimization at certain the characteristic that influences performance of handoffs specific to UE, introduce UE specific handoff parameter (UE specific HOParameter), each eNB safeguards different handoff parameters (being designated as the UE specific handoff parameter) to the UE of different qualities; After certain UE was linked into eNB, eNB also can inform a plurality of UE specific handoff parameters to UE except common handoff parameter; UE will select a suitable UE specific handoff parameter to use according to the characteristic of oneself when switching.Like this, the present invention can consider handover optimization specific to the characteristic of UE with certain that influences performance of handoffs, thereby addresses the above problem.
Below, in order clearly to set forth the present invention, this UE characteristic that influences the UE switching is that example is explained principle of the present invention with " speed ".But the present invention is not limited to this example, influences the UE characteristic that UE switches for other, can introduce UE specific handoff parameter corresponding to this characteristic similarly to optimize the effect of MRO.
As one embodiment of the present of invention, this influences the characteristic specific to UE of performance of handoffs at UE speed, and the present invention has introduced in mobile robustness optimization specific to the handoff parameter of UE speed (represent on the current SeNB S to safeguard about j neighbours NeNB jUE speed characteristic handoff parameter).
Concrete, this method comprises:
Described eNB is that each neighbours eNB safeguards different UE speed specific handoff parameters at the UE of different rates grade;
After A, described UE were linked into eNB, eNB also can inform a plurality of UE specific handoff parameters to UE except common handoff parameter;
B, described UE use UE speed specific handoff parameter to optimize switching in handoff procedure.
Preferably, in described steps A,
1) metrical information that is used for the E-UTRA network (MeasObjectEUTRA) in the metrical information element (Measurement information elements) on the expansion eNB, the UE speed specific handoff parameter of adding different rates grade
Figure G2009100902809D00032
Specifically comprise three new parameters of definition:
Figure G2009100902809D00033
With
Figure G2009100902809D00034
2) current speed grade that new information is used for storing UE of definition on UE.Specifically comprise: definition UE_Speed_Class information, the current speed grade that is used for storing UE is at UE difference value low, middle and the high of basic, normal, high speed grade.And it is joined in the RLF report.
3) after RLF takes place described UE, trigger the operation of optimizing and revising of the last UE speed specific handoff parameter of safeguarding of eNB.Comprise: after RLF takes place described UE, send the RLF report to the eNB of new connection; After described eNB receives the RLF report, extract the UE_Speed_Class information in the RLF report, and (low, middle and the corresponding eNB of high difference go up maintenance to the UE speed specific handoff parameter corresponding to this speed grade With
Figure G2009100902809D00036
Parameter) is optimized adjustment.
Preferably, in described step B, after described UE was linked into eNB, eNB can inform a plurality of UE specific handoff parameters to UE except common handoff parameter.Particularly, described UE with promptly can read switching-related parameters after eNB sets up RRC and is connected, comprise Hyst sParameter, a plurality of Parameter and a plurality of UE speed specific handoff parameter
Figure G2009100902809D00038
Preferably, in described step C,
1) described UE judges the speed grade of oneself, and is stored in the UE_Speed_Class information that defines in the steps A;
2) described UE uses amended A3 incident as from SeNB to NeNB jThe trigger condition of handoff procedure, amended A3 incident shown in inequality (2), wherein,
Figure G2009100902809D00039
The pairing UE speed of speed grade specific handoff parameter (low, middle and the high difference correspondence of representing described UE
Figure G2009100902809D000310
With ).
M n j > M s + Hyst s - CIO s , n j - CIO s , n j , ue _ speed - - - ( 2 )
The present invention is by introducing the UE specific handoff parameter in MRO, the UE characteristic of influence being switched effect is considered mobile robustness optimization, thereby has improved the probability of handover success greatly, has optimized the performance of MRO.
Description of drawings
Fig. 1 is a trigger condition of switching (incident A3) among the LTE/LTE_A;
Fig. 2 is switching (incident A3) trigger condition behind the introducing UE speed specific handoff parameter of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is to introduce the UE specific handoff parameter in mobile robustness optimization, allow eNB safeguard different handoff parameters at the UE of different qualities, the UE characteristic of influence being switched effect is considered mobile robustness optimization, improve the probability of handover success greatly, optimized the performance of MRO.
As one embodiment of the present of invention, this influences the characteristic specific to UE of performance of handoffs at UE speed, introduces UE speed specific handoff parameter
Figure G2009100902809D00042
As shown in Figure 2.
In the present embodiment, eNB need safeguard the UE speed specific handoff parameter of different rates grade for each neighbours eNB, and informs UE after UE inserts eNB, thereby UE just can use UE speed specific handoff parameter to optimize handoff procedure.
For eNB is the UE speed specific handoff parameter of how safeguarding the different rates grade for each neighbours eNB, the present invention proposes following mode.
ENB is divided into different speed grade (low speed UE, middling speed UE, high speed UE) with UE, at the different UE specific handoff parameter of UE maintenance of different rates grade Being eNB safeguards respectively at the UE of basic, normal, high speed grade
Figure G2009100902809D00044
With
Figure G2009100902809D00045
Parameter.Particularly, in the present embodiment, MeasObjectEUTRA information in the expansion metrical information element (Measurement information elements), 3 parameters are added in parameters C IO (cellIndividualOffset) back in its NeighCellsToAddModifyList territory:
Figure G2009100902809D00046
With
Figure G2009100902809D00047
And list their span.Like this UE with promptly may be read into the UE speed specific handoff parameter of safeguarding into all neighbours eNB after SeNB sets up RRC and is connected
Figure G2009100902809D00048
Thereby optimization handoff procedure.
In addition, eNB also need according to before RLF a situation arises comes the UE speed specific handoff parameter of current maintenance is optimized adjustment.Particularly, in the present embodiment, definition UE_Speed_Class information on UE, (value respectively at the UE_Speed_Class on the UE of basic, normal, high speed grade is respectively low to be used for storing the current speed grade of UE, middle and high), and it is joined in the RLF report.After RLF takes place and recovers from RLF in UE, to send the RLF report to the SeNB of new connection, after eNB receives the RLF report, just can extract the UE_Speed_Class information in the RLF report, and by with the mutual of other eNB the type of RLF being judged that the back is optimized adjustment to the UE speed specific handoff parameter corresponding to this speed grade.
After described UE was linked into eNB, eNB will inform a plurality of UE specific handoff parameters to UE, and particularly, this can be by obtaining with directly reading after eNB sets up RRC and is connected, UE with promptly may be read into Hyst after eNB sets up RRC and is connected sParameter, a plurality of
Figure G2009100902809D00051
Parameter (each neighbours NeNB jCorresponding one
Figure G2009100902809D00052
) and a plurality of UE speed specific handoff parameter (each neighbours NeNB jCorresponding three different rates grades
Figure G2009100902809D00053
With
Figure G2009100902809D00054
).
For UE is how to use UE speed specific handoff parameter to optimize handoff procedure, the present invention proposes following mode.
At first, UE need judge the speed grade (low, middle or high) of oneself, and it is stored among the UE_Speed_Class, if UE is equipped with speed measuring module, UE can directly judge speed grade; If do not have special speed measuring module then can use the mode of the joint of 5.2.4.3 among the TS 36.304 to judge the speed grade of UE.
Then, UE selects corresponding UE speed specific handoff parameter according to the speed grade of oneself
Figure G2009100902809D00055
(low, middle and high are corresponding respectively
Figure G2009100902809D00056
With
Figure G2009100902809D00057
), UE promptly uses condition afterwards M n j > M s + Hyst s - CIO s , n j - CIO s , n j , ue _ speed As from SeNB to NeNB jThe trigger condition (being the trigger condition of incident A3) of handoff procedure.
More than be exemplary by the embodiment that is described with reference to the drawings, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.

Claims (4)

1. a mobile robustness optimization method of introducing the UE specific handoff parameter is characterized in that, may further comprise the steps:
A, at certain the characteristic that influences performance of handoffs specific to UE, introduce the UE specific handoff parameter, each base station eNB is safeguarded different handoff parameters to the UE of different qualities;
B, after certain UE is linked into eNB, eNB also can inform a plurality of UE specific handoff parameters to UE except common handoff parameter;
C, UE will select a suitable UE specific handoff parameter to use for self according to the characteristic of oneself when switching;
In the described steps A,
1) metrical information that is used for the E-UTRA network (MeasObjectEUTRA) in the metrical information element (Measurement information elements) on the expansion eNB, the UE speed specific handoff parameter of adding different rates grade
Figure FSB00000613519100011
Represent that current SeNB go up to safeguard about j neighbours NeNB jUE speed characteristic handoff parameter, SeNB represents service eNB, NeNB represents neighbours eNB, specifically comprise the definition three new parameters:
Figure FSB00000613519100012
Figure FSB00000613519100013
With
2) current speed grade that new information is used for storing UE of definition on UE, specifically comprise: definition UE_Speed_Class information, be used for storing the current speed grade of UE, UE difference value low at basic, normal, high speed grade, middle and high, and it is joined in the Radio Link inefficacy RLF report;
3) after RLF takes place for described UE, trigger the operation of optimizing and revising that eNB goes up the UE speed specific handoff parameter safeguarded, comprising: after RLF takes place described UE, send the RLF report to the eNB of new connection; After described eNB receives RLF report, extract the UE_Speed_Class information in the RLF report, and be low to the UE speed specific handoff parameter corresponding to this speed grade, middle and high corresponding eNB respectively go up and safeguard With
Figure FSB00000613519100016
Parameter is optimized adjustment.
2. as a kind of mobile robustness optimization method of introducing the UE specific handoff parameter in the claim 1, it is characterized in that: described step B after certain UE is linked into eNB except common handoff parameter eNB also can inform a plurality of UE specific handoff parameters to UE, it is characterized in that UE and certain eNB set up the Radio Resource control connection and can read a plurality of UE speed characteristic handoff parameters corresponding to the different rates grade from described eNB later on
Figure FSB00000613519100017
Value.
3. as a kind of mobile robustness optimization method of introducing the UE specific handoff parameter in the claim 1, it is characterized in that: described step C, UE will select a suitable UE specific handoff parameter to use for self according to the characteristic of oneself when switching, and it is characterized in that, comprise:
C1, described UE are according to the speed grade of oneself, from a plurality of UE speed characteristic handoff parameters corresponding to the different rates grade
Figure FSB00000613519100021
Value in choose a value that is suitable for self and use;
C2, described UE use expansion A3 trigger conditions as from current eNB to j neighbours NeNB jThe trigger condition of handoff procedure, the A3 incident promptly be trigger UE from current SeNB to NeNB jThe trigger condition of switching.
4. as a kind of mobile robustness optimization method of introducing the UE specific handoff parameter in the claim 3, it is characterized in that: described step C2, UE use expansion A3 trigger conditions as from current eNB to j neighbours NeNB jThe trigger condition of handoff procedure, it is characterized in that expansion A3 trigger conditions is as follows:
M n j > M s + Hyst s - CIO s , n j - CIO s , n j , ue _ speed
Figure FSB00000613519100023
The signal strength signal intensity of representing certain neighbours eNB, M sThe signal strength signal intensity of expression current service eNB, Hyst sSluggish parameter on the current SeNB of expression UE,
Figure FSB00000613519100024
The respective neighbours base station NeNB that the current SeNB of expression UE safeguards jThe sub-district offset parameter.
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