CN101715206A - Method and device used for handoff - Google Patents
Method and device used for handoff Download PDFInfo
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- CN101715206A CN101715206A CN200910082933A CN200910082933A CN101715206A CN 101715206 A CN101715206 A CN 101715206A CN 200910082933 A CN200910082933 A CN 200910082933A CN 200910082933 A CN200910082933 A CN 200910082933A CN 101715206 A CN101715206 A CN 101715206A
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Abstract
A method used for handoff comprises the following steps: adopting the measuring value of the signal quality of the current community to predict the value of the signal quality in the future specified time to obtain the first predicted value; starting timing when the first predicted value is lower than the first threshold; and sending the measuring report if the first predicted values are all lower than the first threshold in the first time period. The predicted value of the signal quality is adopted to replace the original measuring value, so the event trigger time point is advanced, thus saving precious time for subsequent handoff and further ensuring that UE can still successfully carry out handoff under the condition of rapid deterioration of link. The invention also discloses a device used for handoff.
Description
Technical field
The present invention relates to the technology of handover in the moving communicating field, relate in particular to a kind of method and apparatus that is used for handover.
Background technology
In mobile communication system, when portable terminal when the coverage of a sub-district moves to the coverage of another sub-district, communication need be carried out channel and switch to guarantee mobile subscriber's communication continuity, this operation is called handover.Handover mainly comprises three processes: handover measurement, switch decision and execution are switched.
In measuring phases, portable terminal (UE) is measured the pilot signal strength of current area and neighbor cell.Measure type common frequency measurement and different-frequency measure are arranged, metering system can be divided into periodic measurement and Event triggered is measured, usually monitor the quality of current area with periodic measurement, when TD SDMA (TD-SCDMA) system need switch, adopt the Event triggered measurement to monitor the signal quality of neighbor cell or adjacent system.
Fig. 1 shows the part flow process that switch the sub-district in the TD-SCDMA system.
RNC carries out switch decision and carries out follow-up switching flow according to the measurement report that UE sends.
As can be seen, present handover mechanism has adopted based on pilot frequency intensity criterion and hysteresis threshold algorithm, and the pilot frequency intensity criterion is a foundation with PCCPCH RSCP measured value.When PCCPCH RSCP measured value arrives default thresholding, for fear of causing that owing to the signal random fluctuation unnecessary table tennis switches, need continue to detect a period of time to signal, promptly set the timer thresholding, when thresholding is preset in timer arrival, be timer expiry, if detected signal still satisfies condition and then sends measurement report.
Present handover mechanism only detects link-quality at UE and just triggers handover event when relatively poor, because the dynamic characteristic of wireless channel, thereby exist such possibility: UE under the state of high-speed mobile, current communication link worsens rapidly, signal quality has deteriorated into the stage that switching command can't be sent to UE when the network side judgement is switched, and causes necessary switching flow to finish before current link-quality severe exacerbation.In this case, calling will occur is forced to interrupt handoff failure.
Summary of the invention
In view of this, the technical problem to be solved in the present invention provides a kind of method that is used for handover, so that UE still can successfully carry out handover under the situation that link worsens rapidly.
In certain embodiments, the described method that is used for handover comprises: utilize the signal quality measured values of current area to predict its value at following special time, obtain first predicted value; First predicted value picks up counting when being lower than first threshold value; In very first time section,, then send measurement report if all first predicted values all are lower than first threshold value.
In certain embodiments, the described method that is used for handover comprises: utilize the signal quality measured values of candidate cell to predict its value at following special time, obtain second predicted value; Second predicted value picks up counting when being higher than the 3rd threshold value; In second time period,, then send measurement report if all second predicted values all are higher than the 3rd threshold value.
Another object of the present invention provides a kind of device that is used for handover.
In certain embodiments, the described device that is used for handover comprises: first predicting unit, and utilize the signal quality measured values of current area to predict its value at following special time, obtain first predicted value; First timer picks up counting when first predicted value of first predicting unit output is lower than first threshold value, the very first time section of timing length for setting; First trigger element judges whether first predicted value of first predicting unit output in the timing length of first timer all is lower than first threshold value, if then send measurement report.
In certain embodiments, the described device that is used for handover comprises: second predicting unit, and utilize the signal quality measured values of candidate cell to predict its value at following special time, obtain second predicted value; Second timer picks up counting when second predicted value of second predicting unit output is higher than the 3rd threshold value, second time period of timing length for setting; Second trigger element judges whether second predicted value of second predicting unit output in the timing length of second timer all is higher than the 3rd threshold value, if then send measurement report.
As can be seen, because adopt the predicted value of signal quality to substitute former measured value, therefore the time point with Event triggered shifts to an earlier date, thereby has saved valuable time for follow-up hand-off process, and then guarantee that UE under the situation that link worsens rapidly, still can successfully carry out handover.In addition, only some parameter in the existing standard switching flow is replaced in the foregoing description, only replace measured value, and other parameter and handling process remain unchanged all, therefore can use with the current standard scheme is compatible fully with predicted value.
Description of drawings
Fig. 1 is the part flow chart of existing handover in the TD-SCDMA system;
Fig. 2～Fig. 9 is the optional flow chart of the method that is used for handover that proposes of the present invention;
Figure 10～Figure 15 is the optional structural representation of the device that is used for handover that proposes of the present invention.
Embodiment
Fig. 2 shows a kind of optional flow process that is used for handover, and this method comprises:
Here, the PCCPCH RSCP measured value that periodically obtains can be thought the clock signal that disperses to utilize existing prediction algorithm to predict, can obtain a series of PCCPCHRSCP predicted values according to a series of PCCPCH RSCP measured values.Optionally prediction algorithm is Kalman's (Kalman) filtering algorithm or based on the Forecasting Methodology of least mean-square error (LMS) criterion.The prediction that utilizes Kalman filtering or LMS criterion to carry out clock signal is a technology relatively more commonly used, no longer elaborates here.
It is pointed out that time period T
1aLength can be a fixed value, also can be a variable value.A kind of optional mode is, according to the situation of change of signal quality time period T is set dynamically
1aLength.Signal quality variation must be fast more, then time period R
T1aLength short more.
A kind of optional mode is by calculating
Obtain time period T
1aWherein, T
1Be the lag time of setting, ω is the definite weight coefficient of G-bar that utilizes PCCPCH RSCP predicted value.A kind of method of calculating weight coefficient ω is
A is the G-bar of the PCCPCH RSCP predicted value of current area, a
0It is the G-bar reference value of setting.
The current area PCCPCH RSCP slope that is in downward trend is less than 0.If | a|＞| a
0|, the expression signal quality descends very fast, then shortens lag time T
1If | a|≤| a
0, then do not adjust lag time T
1
In actual applications, also can utilize the G-bar of PCCPCH RSCP measured value to determine weight coefficient ω.For example, can be by calculating
Obtain weight coefficient ω, b is the G-bar of the PCCPCH RSCP measured value of current area, b
0It is the G-bar reference value of setting.
Timing thresholding by adjusting timer is with the reply signal situation of decay fast--and Zone switched, UE is different with the rate of decay of PCCPCH RSCP of the current area that receives under the slow situation of translational speed soon in translational speed.Usually, the movement velocity of UE is fast more, and the signal quality that links with former base station descends also fast more; The movement velocity of UE is slow, and then the signal quality that links with former base station descends also slow.Therefore, the variation speed of the signal quality that links according to UE and former base station is correspondingly set the timing thresholding of timer, can guarantee no matter UE can both switch to new base station in time under which kind of state.
Fig. 3 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Wherein, threshold value RSCP_DL_PRD is greater than threshold value RSCP_DL_DROP.
The handling process of step 304～step 312 is identical with step 203～step 211, and this does not give unnecessary details.
As can be seen, than last embodiment, present embodiment is predicted for starting conditionally, and is utilized the PCCPCH RSCP predicted value of current area to carry out handover.
Fig. 4 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Optionally prediction algorithm is a Kalman filtering algorithm or based on the Forecasting Methodology of LMS criterion.The prediction that utilizes Kalman filtering or LMS criterion to carry out clock signal is a technology relatively more commonly used, no longer elaborates here.
Step 408 compares the PCCPCH RSCP predicted value and the threshold value RSCP_DL_ADD of candidate cell.Predicted value is during greater than threshold value RSCP_DL_ADD, execution in step 409.
Step 410 is at time period T
2aWhether the PCCPCH RSCP predicted value of interior candidate cell is all greater than threshold value RSCP_DL_ADD.If then execution in step 411.
In actual applications, also can send the measurement report of the PCCPCH RSCP measured value that includes candidate cell as requested to RNC.
It is pointed out that time period T
2aLength can be a fixed value, also can be a variable value.A kind of optional mode is, according to the situation of change of signal quality time period T is set dynamically
2aLength.Signal quality variation must be fast more, then time period T
2aLength short more.
A kind of optional mode is by calculating
Obtain time period T
2aWherein, T
2Be the lag time of setting, ω is the definite weight coefficient of G-bar that utilizes PCCPCH RSCP predicted value.A kind of method of calculating weight coefficient ω is
C is the G-bar of the PCCPCH RSCP predicted value of candidate cell, c
0It is the G-bar reference value of setting.
The candidate cell PCCPCH RSCP slope that is in ascendant trend is greater than 0.If | c|＞| c
0|, the expression signal quality rises very fast, then shortens lag time T
2If | c|≤| c
0|, then do not adjust lag time T
2
In actual applications, also can utilize the G-bar of PCCPCH RSCP measured value to determine weight coefficient ω.For example, can be by calculating
Obtain weight coefficient ω, d is the G-bar of the PCCPCH RSCP measured value of candidate cell, d
0It is the G-bar reference value of setting.
In the present embodiment, unconditional to being predicted as of the PCCPCH RSCP of candidate cell.In actual applications, also can start prediction conditionally according to actual conditions, and utilize the PCCPCH RSCP predicted value of candidate cell to carry out handover the PCCPCH RSCP of candidate cell.
Fig. 5 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Step 502 compares the PCCPCH RSCP measured value of current area and the threshold value RSCP_DL_PRD of setting.Measured value is during less than threshold value RSCP_DL_PRD, execution in step 503.
Step 503 starts prediction processing, obtains the predicted value of the PCCPCH RSCP of current area.
Step 504 compares the PCCPCH RSCP predicted value and the threshold value RSCP_DL_DROP of current area.Predicted value is during less than threshold value RSCP_DL_DROP, execution in step 505.
Step 506 is at time period T
1aWhether the predicted value of interior PCCPCH RSCP is all less than threshold value RSCP_DL_DROP.If then execution in step 507.
Step 507 sends measurement report by received signal intensity decreases Event triggered to RNC.
Step 510 compares the PCCPCH RSCP predicted value and the threshold value RSCP_DL_ADD of candidate cell.Predicted value is during greater than threshold value RSCP_DL_ADD, execution in step 512.
Step 512 is at time period T
2aWhether the PCCPCH RSCP predicted value of interior candidate cell is all greater than threshold value RSCP_DL_ADD.If then execution in step 513.
It is pointed out that section T computing time
2aThe time, a kind of optional mode is, the weight coefficient ω that utilizes the G-bar of the PCCPCHRSCP predicted value of current area to determine, that is and, the method for calculating weight coefficient ω is
At Fig. 2 to the embodiment shown in Figure 5, owing to adopt the predicted value of PCCPCH RSCP to substitute former measured value, therefore the time point with Event triggered shifts to an earlier date, thereby saved valuable time for follow-up hand-off process, and then guarantee that UE under the situation that link worsens rapidly, still can successfully carry out handover.In addition, only some parameter in the existing standard switching flow is replaced in the foregoing description, only replace measured value, and other parameter and handling process remain unchanged all, therefore can use with the current standard scheme is compatible fully with predicted value.
Fig. 6 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Step 602 compares the PCCPCH RSCP measured value of current area and the threshold value RSCP_DL_DROP of setting.Measured value is during less than threshold value RSCP_DL_DROP, execution in step 603.
Step 604 is provided with the timing length T of timer according to the situation of change of PCCPCH RSCP
1aWherein, PCCPCH RSCP changes fast more, timing length T
1aShort more.
A kind of optional mode is, by calculating
Obtain timing length T
1a, wherein,
Step 605 is at time period T
1aWhether the measured value of interior PCCPCH RSCP is all less than threshold value RSCP_DL_DROP.If then execution in step 606.
Step 606 sends measurement report by received signal intensity decreases Event triggered to RNC.
Step 608 compares the PCCPCH RSCP measured value and the threshold value RSCP_DL_ADD of candidate cell.Measured value is during greater than threshold value RSCP_DL_ADD, execution in step 609.
Step 610 is at lag time T
2Whether the PCCPCH RSCP measured value of interior candidate cell is all greater than threshold value RSCP_DL_ADD.If then execution in step 611.
Step 611 sends measurement report to RNC.
Fig. 7 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Step 702 compares the PCCPCH RSCP measured value of current area and the threshold value RSCP_DL_PRD of setting.Measured value is during less than threshold value RSCP_DL_PRD, execution in step 703.
Step 703 starts prediction processing, obtains the predicted value of the PCCPCH RSCP of current area.
Step 704 compares the PCCPCH RSCP predicted value and the threshold value RSCP_DL_DROP of current area.Predicted value is during less than threshold value RSCP_DL_DROP, execution in step 705.
Step 706 is provided with the timing length T of timer according to the situation of change of PCCPCH RSCP
1a
A kind of optional mode is, by calculating
Obtain timing length T
1a, wherein,
The handling process of step 707～step 713 is identical with step 605～step 611, and this does not give unnecessary details.
In the present embodiment, because adopt the predicted value of PCCPCH RSCP to substitute former measured value, therefore the time point with Event triggered shifts to an earlier date, thereby has saved valuable time for follow-up hand-off process, and then guarantee that UE under the situation that link worsens rapidly, still can successfully carry out handover.
Fig. 8 shows the another kind of optionally flow process that is used for handover, and this method comprises:
Step 802 compares the PCCPCH RSCP measured value and the threshold value RSCP_DL_DROP of current area.Measured value is during less than threshold value RSCP_DL_DROP, execution in step 803.
Step 804 is at lag time T
1Whether the measured value of interior PCCPCH RSCP is all less than threshold value RSCP_DL_DROP.If then execution in step 805.
Step 805 sends measurement report by received signal intensity decreases Event triggered to RNC.
Step 808 compares the PCCPCH RSCP predicted value and the threshold value RSCP_DL_ADD of candidate cell.Predicted value is during greater than threshold value RSCP_DL_ADD, execution in step 809.
Step 810 is provided with the timing length T of timer according to the situation of change of PCCPCH RSCP predicted value
2aWherein, PCCPCH RSCP changes fast more, timing length T
2aShort more.
A kind of optional mode is by calculating
Obtain timing length T
2a, wherein,
Step 811 is at time period T
2aWhether the PCCPCH RSCP predicted value of interior candidate cell is all greater than threshold value RSCP_DL_ADD.If then execution in step 812.
Fig. 9 shows the another kind of optionally flow process that is used for handover, and this method comprises:
The handling process of step 901～step 906 is identical with step 801～step 806, and this does not give unnecessary details.
Step 907 compares the PCCPCH RSCP measured value and the threshold value RSCP_DL_ADD of candidate cell.Measured value is during greater than threshold value RSCP_DL_ADD, execution in step 908.
Step 909 is provided with the timing length T of timer according to the situation of change of the PCCPCH RSCP measured value of candidate cell
2a
A kind of optional mode is by calculating
Obtain timing length T
2a, wherein,
Step 910 is at time period T
2aWhether the PCCPCH RSCP measured value of interior candidate cell is all greater than threshold value RSCP_DL_ADD.If then execution in step 911.
At Fig. 6 to the embodiment shown in Figure 9, timing thresholding by adjusting timer is with the reply signal situation of decay fast--and Zone switched, UE is different with the rate of decay of PCCPCHRSCP of the current area that receives under the slow situation of translational speed soon in translational speed.Usually, the movement velocity of UE is fast more, and the signal quality that links with former base station descends also fast more; The movement velocity of UE is slow, and then the signal quality that links with former base station descends also slow.Therefore, the variation speed of the signal quality that links according to UE and former base station is correspondingly set the timing thresholding of timer, can guarantee no matter UE can both switch to new base station in time under which kind of state.
For example, in the TD-SCDMA system, because of candidate cell is the RNC sub-district definite according to the position of UE, in general be in the elongated area of the UE direction of motion, so the movement velocity of UE is fast, then candidate cell PCCPCHRSCP rising is also fast, and the UE movement velocity is slow, and then candidate cell PCCPCH RSCP rises also slow.
Figure 10 shows a kind of optional device that is used for handover, and this device 100 comprises the first predicting unit S11, first timer S12 and the first trigger element S13.
The first predicting unit S11 utilizes the PCCPCH RSCP measured value of current area to predict its value at following special time, obtains the PCCPCH RSCP predicted value of current area.When the PCCPCH RSCP predicted value of first predicting unit S11 output was lower than threshold value RSCP_DL_DROP, first timer S12 picked up counting, and timing length is time period T
1aThe first trigger element S13 judges the timing length T at first timer S12
1aWhether the PCCPCH RSCP predicted value of interior first predicting unit S11 output all is lower than threshold value RSCP_DL_DROP, if then send measurement report.
Time period T
1aLength can be a fixed value, also can be a variable value.A kind of optional mode is, according to the situation of change of signal quality time period T is set dynamically
1aLength.For this reason, described device 100 comprises that also one first is provided with the unit, is provided with the timing length T of first timer S12 according to the situation of change of PCCPCH RSCP
1aWherein, PCCPCH RSCP changes fast more, timing length T
1aShort more.A kind of optional mode is by calculating
Obtain time period T
1a
Figure 11 shows the another kind of optionally device that is used for handover, and this device 200 comprises the first predicting unit S11, first timer S12, the first trigger element S13 and comparing unit S21.Comparing unit S21 is used for the PCCPCH RSCP measured value and the threshold value RSCP_DL_PRD of comparison current area.When PCCPCH RSCP measured value during, start the first predicting unit S11 less than threshold value RSCP_DL_PRD.
Figure 12 shows the another kind of optionally device that is used for handover, and this device 300 comprises the second predicting unit S31, second timer S32 and the second trigger element S33.
The second predicting unit S31 utilizes the PCCPCH RSCP measured value of candidate cell to predict its value at following special time, obtains the PCCPCH RSC predicted value of candidate cell.The PCCPCH RSCP predicted value of second predicting unit S31 output is during greater than threshold value RSCP_DL_ADD, and second timer S32 picks up counting, and timing length is time period T
2a
The second trigger element S33 judges that whether the PCCPCH RSCP predicted value of second predicting unit S31 output in the timing length of second timer S32 is all greater than threshold value RSCP_DL_ADD.If then send measurement report.
Time period T
2aLength can be a fixed value, also can be a variable value.A kind of optional mode is, according to the situation of change of signal quality time period T is set dynamically
2aLength.For this reason, described device 300 comprises that also one second is provided with the unit, is provided with the timing length T of second timer S32 according to the situation of change of PCCPCH RSCP
2aWherein, PCCPCH RSCP changes fast more, timing length T
2aShort more.A kind of optional mode is by calculating
Obtain timing length T
2a
Figure 13 shows the another kind of optionally device that is used for handover, and this device 400 comprises the first predicting unit S11, first timer S12, the first trigger element S13, the second predicting unit S31, second timer S32 and the second trigger element S33.
Figure 14 shows the another kind of optionally device that is used for handover, and this device 500 comprises that first timer S12, first is provided with the cell S 51 and the first trigger element S13.
When the signal quality of current area was lower than threshold value RSCP_DL_DROP, first timer S12 picked up counting.Wherein, PCCPCH RSCP measured value that can current area is as the signal quality of current area, and PCCPCH RSCP predicted value that perhaps can current area is as the signal quality of current area.During as the signal quality of current area, described device 500 also comprises the first predicting unit S11 with the PCCPCH RSCP predicted value of current area.The predicted value of first predicting unit S11 output is as the signal quality of current area.
Figure 15 shows the another kind of optionally device that is used for handover, and this device 600 comprises that second timer S32, second is provided with the cell S 61 and the second trigger element S33.
During greater than threshold value RSCP_DL_ADD, second timer S32 picks up counting at the signal quality of candidate cell.Wherein, PCCPCH RSCP measured value that can candidate cell is as the signal quality of candidate cell, and PCCPCH RSCP predicted value that perhaps can candidate cell is as the signal quality of candidate cell.During as the signal quality of candidate cell, described device 600 also comprises the second predicting unit S31 with the PCCPCH RSCP predicted value of candidate cell.The predicted value of second predicting unit S31 output is as the signal quality of candidate cell.
In above each embodiment, though all be the signal quality that obtains the sub-district with measurement PCCPCH RSCP, those skilled in the art can understand that fully the mode that obtains the signal quality of sub-district has a lot, is not limited only to measure PCCPCH RSCP.Because innovation part of the present invention does not also lie in the mode that obtains the cell signal quality, therefore, the above-mentioned arbitrary embodiment that provides can be provided the mode of any acquisition cell signal quality, and does not influence the realization of the object of the invention.
Those skilled in the art can understand, various exemplary method step of describing in conjunction with the disclosed embodiments and device unit all can electronic hardware here, software or the combination of the two realize.In order to be clearly shown that the interchangeability between the hardware and software, more than various exemplary steps and unit are all carried out generally description with its functional form.This functional be to realize or realize depending on the design constraint that specific application and whole system are realized with software with hardware.Those skilled in the art can be at each specific application, realize in many ways described functional, but the result of this realization should not be construed as and deviates from scope of the present invention.
In conjunction with the step of the described method of above-mentioned disclosed embodiment can directly be presented as hardware, the software module carried out by processor or the combination of these two.Software module may be present in the storage media of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, mobile disk, CD-ROM or any other form well known in the art.The coupling of a kind of exemplary storage medium and processor, thus make processor can be from this storage media read message, and can be to this storage media write information.In replacing example, storage media is the part of processor.Processor and storage media may be present among the ASIC.This ASIC may be present in the subscriber station.Replace in the example at one, the discrete assembly that processor and storage media can be used as in the subscriber station exists.
According to described disclosed embodiment, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (24)
1. a method that is used for handover is characterized in that, comprising:
Utilize the signal quality measured values of current area to predict its value, obtain first predicted value at following special time;
First predicted value picks up counting when being lower than first threshold value;
In very first time section,, then send measurement report if all first predicted values all are lower than first threshold value.
2. the method for claim 1 is characterized in that, the length of very first time section is set according to the situation of change of signal quality; Signal quality variation is fast more, and very first time section is short more.
3. method as claimed in claim 2 is characterized in that, by calculating
Wherein, T
1Be first set point, ω is the definite weight coefficient of G-bar that utilizes first predicted value.
4. method as claimed in claim 3 is characterized in that, by calculating
Obtain weight coefficient ω;
Wherein, a is the G-bar of first predicted value, a
0It is the G-bar reference value of setting.
5. the method for claim 1 is characterized in that, the signal quality measured values of current area starts prediction during less than second threshold value;
Wherein, second threshold value is greater than first threshold value.
6. the method for claim 1 is characterized in that, further comprises after sending the report be used to trigger handover measurement:
Utilize the signal quality measured values of candidate cell to predict its value, obtain second predicted value at following special time;
Second predicted value picks up counting when being higher than the 3rd threshold value;
At the second time period T
2aIn, if all second predicted values all are higher than the 3rd threshold value, then send measurement report.
7. method as claimed in claim 6 is characterized in that, sends to carry the measurement report of second predicted value.
8. as each described method of claim 1 to 7, it is characterized in that, measure Primary Common Pilot Channel receiving code power P CCPCH RSCP picked up signal quality measured values.
9. a method that is used for handover is characterized in that, comprising:
Utilize the signal quality measured values of candidate cell to predict its value, obtain second predicted value at following special time;
Second predicted value picks up counting when being higher than the 3rd threshold value;
In second time period,, then send measurement report if all second predicted values all are higher than the 3rd threshold value.
10. method as claimed in claim 9 is characterized in that, the length of second time period is set according to the situation of change of signal quality; Signal quality variation is fast more, and second time period is short more.
11. method as claimed in claim 10 is characterized in that, by calculating
Wherein, T
2Be second set point, ω is the definite weight coefficient of G-bar that utilizes second predicted value.
12. method as claimed in claim 11 is characterized in that, by calculating
Obtain weight coefficient ω;
Wherein, c is the G-bar of second predicted value, c
0It is the G-bar reference value of setting.
13. method as claimed in claim 9 is characterized in that, sends to carry the measurement report of second predicted value.
14. a device that is used for handover is characterized in that, comprising:
First predicting unit utilizes the signal quality measured values of current area to predict its value at following special time, obtains first predicted value;
First timer picks up counting when first predicted value of first predicting unit output is lower than first threshold value, the very first time section of timing length for setting;
First trigger element judges whether first predicted value of first predicting unit output in the timing length of first timer all is lower than first threshold value, if then send measurement report.
15. device as claimed in claim 14 is characterized in that, also comprises:
First is provided with the unit, and the timing length of first timer is set according to the situation of change of signal quality;
Wherein, signal quality variation is fast more, timing length T
1aShort more.
16. device as claimed in claim 15 is characterized in that, by calculating
Wherein, T
1Be first set point, ω is the definite weight coefficient of G-bar that utilizes first predicted value.
17. device as claimed in claim 16 is characterized in that, by calculating
Obtain weight coefficient ω;
Wherein, a is the G-bar of first predicted value, a
0It is the G-bar reference value of setting.
18. device as claimed in claim 14 is characterized in that, also comprises:
Comparing unit during less than second threshold value, starts first predicting unit at the signal quality measured values of current area;
Wherein, second threshold value is greater than first threshold value.
19. device as claimed in claim 14 is characterized in that, also comprises:
Second predicting unit utilizes the signal quality measured values of candidate cell to predict the value of this parameter at following special time, obtains second predicted value;
Second timer is used for picking up counting second time period of timing length for setting when second predicted value of second predicting unit output is higher than the 3rd threshold value;
Second trigger element is used to judge whether second predicted value of second predicting unit output in the timing length of second timer all is higher than the 3rd threshold value, if then the triggering following unit sends measurement report.
20. device as claimed in claim 18 is characterized in that, sends to carry the measurement report of second predicted value.
21. a device that is used for handover is characterized in that, comprising:
Second predicting unit utilizes the signal quality measured values of candidate cell to predict its value at following special time, obtains second predicted value;
Second timer picks up counting when second predicted value of second predicting unit output is higher than the 3rd threshold value, second time period of timing length for setting;
Second trigger element judges whether second predicted value of second predicting unit output in the timing length of second timer all is higher than the 3rd threshold value, if then send measurement report.
22. device as claimed in claim 21 is characterized in that, also comprises:
Second is provided with the unit, and the timing length of second timer is set according to the situation of change of signal quality;
Wherein, signal quality variation is fast more, and timing length is short more.
23. device as claimed in claim 22 is characterized in that, by calculating
Wherein, T
2Be second set point, ω is the definite weight coefficient of G-bar that utilizes second predicted value.
24. device as claimed in claim 23 is characterized in that, by calculating
Obtain weight coefficient ω;
Wherein, c is the G-bar of second predicted value, c
0It is the G-bar reference value of setting.
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