CN101355815B - Soft switch method and apparatus - Google Patents

Abstract

The present invention discloses a method and a device for the soft handover in a CDMA2000 network. The method comprises of setting a dynamic deletion pilot threshold and a dynamic addition pilot threshold; setting the value of the dynamic deletion pilot threshold to be less than the value of the dynamic addition pilot threshold when the dynamic deletion pilot threshold is greater than the dynamic addition pilot threshold; setting the value of the dynamic deletion pilot threshold to be the value of static deletion pilot threshold when the dynamic deletion pilot threshold is also less than the static deletion pilot threshold; executing the soft handover according to the set dynamic deletion pilot threshold and the dynamic addition pilot threshold. The inversion of the threshold can be avoided by the method.

Description

Soft handover method and device

Technical field

The present invention relates to the communications field, in particular to a kind of soft handover method and device that is used for CDMA (CodeDivision Multiple Access is called for short code division multiple access and inserts) 2000 networks.

Background technology

Soft handover is a big advantage of CDMA2000 system.Adopt soft handover, the terminal can connect with Target cell earlier when switching, and breaks off with former sub-district being connected again, thereby reduces the cutting off rate when switching greatly.

When soft handover, according to the difference of each district pilots intensity, terminal definitions has also been safeguarded four pilot sets: active set (Active Set), candidate collection (Candidate Set), adjacent area collection (Neighbor Set) and reservation collection (Remaining Set).Effectively centralized stores is the pilot tone of the enough and sub-district that connect with the terminal of signal strength signal intensity; The candidate centralized stores be the enough but pilot tone of sub-district that do not connect with the terminal as yet of signal strength signal intensity; The adjacent area centralized stores be that signal strength signal intensity is poor slightly and might be as the pilot tone of the neighbor cell of switching target; What keep centralized stores is all pilot tones that do not belong to upper set.

In the CDMA2000 system, add pilot tone and from active set, delete the method that pilot tone all adopts dynamic threshold to active set from the candidate collection.

For example, in active set, add the dynamic threshold (T_ADD of pilot tone ^*) can be:

$T\_{\mathrm{ADD}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}P{S}_i+\frac{\mathrm{ADD}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2}$

The intensity sum of all pilot tones in

expression active set in this formula; SOFT_SLOPE representes slope, and ADD_INTERCEPT representes to add the intercept of pilot tone, and these two parameter operators are controlled.The intensity of concentrating pilot tone when candidate is during greater than this thresholding, applies for that this pilot tone adds active set to from the candidate collection.

Certain intensity of deletion is PS from active set _kThe dynamic threshold (T_DROP of pilot tone ^*) can be:

$T\_{\mathrm{DROP}}^{*}=\max (\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j+\frac{\mathrm{DROP}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2},-\frac{T\_\mathrm{DROP}}{2})$

In this formula

Intensity is greater than waiting to delete pilot tone PS in the expression active set _kAll pilot frequency intensity sums; SOFT_SLOPE representes slope, and DROP_INTERCEPT representes to delete the intercept of pilot tone, and T_DROP representes the thresholding of static deletion pilot tone, and these three parameter operators are controlled.As pilot tone PS _kIntensity during greater than this thresholding, apply for that this pilot tone adds active set to from the candidate collection.

Adopt dynamically interpolation pilot threshold and dynamically deletion pilot threshold, can change thresholding flexibly according to the varying strength of pilot tone in the existing active set: when effective concentrated pilot frequency intensity is strong, T_ADD ^*Threshold value is higher, and the requirement of in active set, adding other pilot tones this moment is also higher, otherwise requires then lower; When effectively concentrated other pilot frequency intensities greater than certain pilot tone are strong, the T_DROP of this pilot tone ^*Threshold value is higher, and this moment, this pilot tone was easier to from active set, deleted, otherwise then difficult.This meets common optimization requirement.But, if the relevant parameter unreasonable allocation also can bring dynamic threshold to be inverted hidden danger.Explain through an example below.

As shown in Figure 1, portable terminal from the sub-district A at the uniform velocity mobile to sub-district B, soft handover can take place.Suppose to be configured to the relevant network parameter of switching this moment: SOFT_SLOPE=7dB, DROP_INTERCEPT=-12dB, ADD_INTERCEPT=-15dB, T_DROP=-15dB, T_ADD=-13dB.The soft switching process of portable terminal is divided into 21 time points, supposes that switching timer T_TDROP duration is the interval between adjacent two time points.At t1 constantly, the terminal is very near sub-district A, and at t21 constantly, the terminal is very near sub-district B; Each constantly be spaced apart T_TDROP length.Suppose in the intensity of the pilot tone of these 21 time point sub-district A and sub-district B as shown in table 1ly respectively, can calculate T_ADD respectively according to above-mentioned formula ^*The T_DROP of thresholding, pilot tone A, B ^*Thresholding, and confirm the pilot set under pilot tone A, the B according to dependent threshold, as shown in table 1.

Table 1

Time	The intensity of pilot tone A	The intensity of pilot tone B	The T_DROP of pilot tone A *	The T_DROP of pilot tone B *	T_ADD *	Pilot tone A	Pilot tone B
								1	-3.70	-17.00	———	——	-10.74	Active	Neighbor
2	-3.80	-16.00	——	——	-10.83	Active	Neighbor
								3	-3.90	-15.00	——	——	-10.91	Active	Neighbor
4	-4.00	-14.00	——	——	-11.00	Active	Neighbor
								5	-4.25	-13.00	——	——	-11.22	Active	Candidate
6	-4.50	-12.00	——	——	-11.44	Active	Candidate
								7	-4.75	-11.00	——	——	-11.66	Active	Candidate
8	-5.00	-10.00	——	-10.38	-10.83	Active	Active
								9	-5.50	-9.00	——	-10.81	-10.91	Active	Active
10	-6.00	-8.00	——	-11.25	-10.89	Active	Active
								11	-7.00	-7.00	——	——	-10.99	Active	Active
12	-8.00	-6.00	-11.25	——	-10.89	Active	Active
								13	-9.00	-5.50	-10.81	——	-10.91	Active	Active
14	-10.00	-5.00	-10.38	——	-10.83	Active	Active
								15	-11.00	-4.75	-10.16	——	-10.85	Active	Active
16	-12.00	-4.50	-9.94	——	-10.82	Active	Active
								17	-13.00	-4.25	——	——	-11.22	Candidate	Active
18	-14.00	-4.00	——	——	-11.00	Candidate	Active
								19	-15.00	-3.90	——	——	-10.91	Candidate	Active
20	-16.00	-3.80	——	——	-10.83	Neighbor	Active
								21	-17.00	-3.70	——	——	-10.74	Neighbor	Active

Visible by Fig. 2 or table 1, at the t8 and the t9 moment, the T_DROP of pilot tone B ^*Thresholding is greater than T_ADD ^*That is to say that pilot tone B intensity (Ec/Io) at this moment is as long as be lower than higher thresholding T_DROP ^*Will from active set, be deleted, as long as and the intensity of other pilot tones is higher than lower thresholding T_ADD ^*Just be introduced into active set, obvious so unfair to pilot tone B.Similarly, also unfair to pilot tone A constantly at t13, t14, t15, t16.The inverted phenomenon of dynamic threshold has just taken place at these time points.

In addition, might cause certain pilot tone to be lower than T_DROP in this case because of intensity ^*Thresholding is by after active set deletion, again because intensity greater than T_ADD ^*Thresholding and added active set once more, this process frequently takes place can increase overhead significantly.

Though stipulated the algorithm of dynamic threshold in the CDMA2000 agreement, ADD_INTERCEPT and DROP_INTERCEPT values of parameters do not made any restrictive regulation.This can produce the thresholding phenomena of inversion with regard to having caused because parameter configuration is improper in real network.

In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem: the terminal of CDMA2000 system is when soft handover, and handoff parameter disposes improper meeting and causes thresholding to be inverted.

Summary of the invention

The present invention aims to provide a kind of soft handover method and device of the CDMA2000 of being used for network, to solve the inverted problem of thresholding.

The invention provides a kind of soft handover method of the CDMA2000 of being used for network, this method comprises: dynamic deletion pilot threshold is set and dynamically adds pilot threshold; When dynamic deletion pilot threshold when dynamically adding pilot threshold, the value that dynamic deletion pilot threshold is set is for less than the value of dynamically adding the value of pilot threshold; When dynamic deletion pilot threshold is also deleted pilot threshold less than static state, the value of the value of dynamic deletion pilot threshold for static deletion pilot threshold is set; Carry out soft handover according to dynamic deletion pilot threshold that is provided with and the dynamic pilot threshold of adding.

The present invention also provides a kind of soft handover device of the CDMA2000 of being used for network, and this device comprises: pre-set module, be used for being provided with in advance dynamic deletion pilot threshold and dynamically add pilot threshold; First is provided with module, be used for when dynamic deletion pilot threshold when dynamically adding pilot threshold, the value that dynamic deletion pilot threshold is set is for less than the value of dynamically adding the value of pilot threshold; Second is provided with module, is used for when dynamically the deletion pilot threshold is also less than static state deletion pilot threshold, the value of the value of dynamic deletion pilot threshold for static deletion pilot threshold being set; Soft switching module is carried out soft handover according to dynamic deletion pilot threshold that is provided with and the dynamic pilot threshold of adding.

Through soft handover method provided by the invention and device, make dynamic deletion pilot threshold all the time less than dynamically adding pilot threshold, be inverted problem so overcome thresholding, and then reached the effect of conserve system resources.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the sketch map of terminal in inter-cell soft handoff;

Fig. 2 is the datagram of terminal in soft handover;

Fig. 3 is the flow chart according to the soft handover method of the embodiment of the invention;

Fig. 4 is the flow chart according to the soft handover method of the embodiment of the invention one;

Fig. 5 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention one;

Fig. 6 is the flow chart according to the soft handover method of the embodiment of the invention two;

Fig. 7 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention two;

Fig. 8 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention three;

Fig. 9 is the flow chart according to the soft handover method of the embodiment of the invention three;

Figure 10 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention four;

Figure 11 is the flow chart according to the soft handover method of the embodiment of the invention four;

Figure 12 is the block diagram according to the soft handover device of the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.

According to the embodiment of the invention, a kind of soft handover method is provided.

Fig. 3 is the flow chart according to the soft handover method of the embodiment of the invention, and this method is used for the CDMA2000 network, and is as shown in Figure 3, and this method may further comprise the steps:

Step S302 is provided with dynamic deletion pilot threshold and dynamically adds pilot threshold;

Step S304, when dynamic deletion pilot threshold when dynamically adding pilot threshold, the value that dynamic deletion pilot threshold is set is for less than the value of dynamically adding the value of pilot threshold;

Step S306 when dynamic deletion pilot threshold is also deleted pilot threshold less than static state, is provided with the value of the value of dynamic deletion pilot threshold for static deletion pilot threshold;

Step S308 carries out soft handover according to dynamic deletion pilot threshold that is provided with and the dynamic pilot threshold of adding.

Through this embodiment, dynamically delete pilot threshold all the time less than dynamically adding pilot threshold, avoided the inverted situation of thresholding in the soft handover.

Wherein, dynamic deletion pilot threshold being set specifically comprises with the dynamic pilot threshold of adding: dynamic deletion pilot threshold is set $T\_{\mathrm{DROP}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="Log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j+\frac{\mathrm{DROP}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2};$ Dynamic interpolation pilot threshold is set $T\_{\mathrm{ADD}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="Log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Log</figure-callout>}}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}P{S}_i+\frac{\mathrm{ADD}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2};$ Wherein, SOFT_SLOPE representes slope,

The intensity sum of all pilot tones in the expression active set,

Intensity is greater than all pilot frequency intensity sums of waiting to delete pilot tone PSk in the expression active set.

And, when dynamic deletion pilot threshold when dynamically adding pilot threshold, the value that dynamic deletion pilot threshold is set is for specifically comprising less than the value of dynamically adding the value of pilot threshold: dynamic deletion pilot threshold T_DROP is set ^*=min (T_DROP ^*, T_ADD ^*-Margin), wherein, Margin is the allowance parameter; When dynamic deletion pilot threshold was also deleted pilot threshold less than static state, the value that dynamic deletion pilot threshold is set specifically comprised for static value of deleting pilot threshold: dynamic deletion pilot threshold is set $T\_{\mathrm{DROP}}^{**}=\mathrm{Max}(T\_{\mathrm{DROP}}^{*},-\frac{T\_\mathrm{DROP}}{2}).$

And; When dynamic deletion pilot threshold when dynamically adding pilot threshold; The value that dynamic deletion pilot threshold is set is for specifically comprising less than the value of dynamically adding the value of pilot threshold: when the value of the parameter DROP_INTERCEPT that comes automatic network during greater than the value of parameter A DD_INTERCEPT, the value that parameter DROP_INTERCEPT is set equals the value of parameter A DD_INTERCEPT, wherein; DROP_INTERCEPT representes to delete the intercept of pilot tone, and ADD_INTERCEPT representes to add the intercept of pilot tone.

Through the above embodiment of the present invention, can avoid the thresholding phenomena of inversion, and prevent that the pilot tone that intensity is in critical value from getting into and withdrawing from active set repeatedly, effectively saved overhead.

Embodiment one

The terminal is calculated T_ADD according to the parameter that receives from network according to formula (1) when carrying out soft handover ^*(dynamically adding pilot threshold) and according to formula (2) T_DROP ^*(dynamically deleting pilot threshold).

$T\_{\mathrm{ADD}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}P{S}_i+\frac{\mathrm{ADD}\_\mathrm{INTERCEPT}}{2}---\left(1\right)$

$T\_{\mathrm{DROP}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j+\frac{\mathrm{DROP}\_\mathrm{INTERCEPT}}{2}---\left(2\right)$

According to the CDMA2000 agreement, the parameter that operator can dispose in soft switching process mainly contains: SOFT_SLOPE, ADD_INTERCEPT, DROP_INTERCEPT, T_ADD etc.Contrast equation (1) and formula (2) can be found T_ADD ^*And T_DROP ^*Be respectively that independent variable does

With Linear function, their slope all does

T_ADD ^*Intercept be $\frac{\mathrm{ADD}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2},$ T_DROP ^*Intercept be $\frac{\mathrm{DROP}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2}.$

At any one time,

Be the intensity sum of all active set pilot tones, Be in the pilot set intensity greater than all pilot frequency intensity sums of waiting to delete pilot tone, therefore $10\mathrm{<figure-callout\; id="10"\; label="Lo\; g"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Lo</figure-callout>}{g}_{}{}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}{\mathrm{PS}}_i$ Always greater than $10\mathrm{<figure-callout\; id="10"\; label="Lo\; g"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Lo</figure-callout>}{g}_{}{}_{10}\underset{j\&Element;A^{\mathrm{PS}}_j>{\mathrm{PS}}_k}{\mathrm{\&Sigma;}}{\mathrm{PS}}_j.$

But, because T_ADD ^*And T_DROP ^*Intercept different, so if

Greater than

Just might cause the T_DROP of certain pilot tone at a time ^*Thresholding is greater than T_ADD ^*Thresholding.

Therefore, if restriction ADD_INTERCEPT and DROP_INTERCEPT values of parameters that is to say, only allow DROP_INTERCEPT to get to be less than or equal to the value of ADD_INTERCEPT, just can make T_DROP ^*Thresholding is not more than T_ADD ^*Thresholding.

Fig. 4 is the flow chart according to the soft handover method of the embodiment of the invention one, and is as shown in Figure 4, and this method comprises the steps:

Step S402, the terminal receives the ADD_INTERCEPT relevant with soft handover and the DROP_INTERCEPT parameter of automatic network;

Step S404, judge that DROP_INTERCEPT is whether greater than the ADD_INTERCEPT parameter: if, execution in step S406 then; Otherwise, execution in step S412;

Step S406 is provided with DROP_INTERCEPT=ADD_INTERCEPT;

Step S408 is according to adjusted parameter value calculation T_DROP ^*

Step S410 is as the T_DROP that calculates ^*During also less than T_DROP (static deletion pilot threshold), the value of T_DROP is set to T_DROP ^*Value;

Step S412 carries out soft handover according to new dynamic deletion pilot threshold and the dynamic pilot threshold of adding.

With the initial data in the table 1 is example, and the handoff parameter that the method that adopts present embodiment to provide is calculated is as shown in table 2:

Table 2

Time	The intensity of pilot tone A	The intensity of pilot tone B	The T_DROP of pilot tone A *	The T_DROP of pilot tone B *	T_ADD *	Pilot tone A	Pilot tone B
								1	-3.70	-17.00	——	——	-10.74	Active	Neighbor
2	-3.80	-16.00	——	——	-10.83	Active	Neighbor
								3	-3.90	-15.00	——	——	-10.91	Active	Neighbor
4	-4.00	-14.00	——	——	-11.00	Active	Neighbor
								5	-4.25	-13.00	——	——	-11.22	Active	Candidate
6	-4.50	-12.00	——	——	-11.44	Active	Candidate
								7	-4.75	-11.00	——	——	-11.66	Active	Candidate
8	-5.00	-10.00	——	-11.88	-10.83	Active	Active
								9	-5.50	-9.00	——	-12.31	-10.91	Active	Active
10	-6.00	-8.00	——	-12.75	-10.89	Active	Active
								11	-7.00	-7.00	——	——	-10.99	Active	Active
12	-8.00	-6.00	-12.75	——	-10.89	Active	Active
								13	-9.00	-5.50	-12.31	——	-10.91	Active	Active
14	-10.00	-5.00	-11.88	——	-10.83	Active	Active
								15	-11.00	-4.75	-11.66	——	-10.85	Active	Active
16	-12.00	-4.50	-11.44	——	-10.82	Active	Active
								17	-13.00	-4.25	——	——	-11.22	Candidate	Active
18	-14.00	-4.00	——	——	-11.00	Candidate	Active
								19	-15.00	-3.90	——	——	-10.91	Candidate	Active
20	-16.00	-3.80	——	——	-10.83	Neighbor	Active
								21	-17.00	-3.70	——	——	-10.74	Neighbor	Active

Fig. 5 is that Fig. 5 uses the data in the table 2 according to the sketch map of the dynamic deletion pilot threshold setting of the embodiment of the invention one.By shown in Figure 5, any moment T_DROP ^*Thresholding all is not more than T_ADD ^*Thresholding.

Present embodiment has carried out preliminary treatment to the soft-handoff parameters that receives, and guarantees that the value of DROP_INTERCEPT is not more than the value of ADD_INTERCEPT, thereby makes T_DROP ^*Thresholding is not more than T_ADD ^*Thresholding has avoided the inverted situation of thresholding to take place.

Embodiment two

Soft handover is carried out at the terminal, calculates T_ADD according to formula (1) ^*And according to formula (2) calculating T_DROP ^*If, T_DROP ^*Value greater than T_ADD ^*Value, then reset T_DROP according to formula (3) ^*Value;

$T\_{\mathrm{DROP}}^{*}=\max \left(\begin{array}{c}\min (\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j+\frac{\mathrm{DROP}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2},T\_\mathrm{AD}{D}^{*}-M\arg \mathrm{in})\\ ,-\frac{T\_\mathrm{<figure-callout\; id="2"\; label="DROP"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">DROP</figure-callout>}}{2}\end{array}\right)$

(3)

The T_DROP that calculates according to formula (3) ^*Less than T_ADD ^*, according to the T_DROP that resets ^*And T_ADD ^*Carry out soft handover, can not produce thresholding and be inverted.

Fig. 6 is the flow chart according to the soft handover method of the embodiment of the invention two, and is as shown in Figure 6, and this method may further comprise the steps:

Step S602 calculates T_DROP according to formula (1) and formula (2) ^*Thresholding and T_ADD ^*Thresholding;

Step S604, the T_DROP that the terminal relatively calculates ^*Whether greater than T_ADD ^*: if, execution in step S606 then; Otherwise, execution in step S610;

Step S606 is provided with T_DROP ^*Equal T_ADD ^*-M argin, wherein, Margin is the allowance parameter;

Step S608 is as the T_DROP that calculates ^*During also less than T_DROP, the value of T_DROP is set to T_DROP ^*Value;

Step S610, the soft handover stipulated in the agreement carries out according to adjusted dynamic threshold at the terminal.

Margin is the allowance parameter in the formula (3), and the value of Margin can be provided with or the network acquiescence by operator.Setting through Margin can be introduced stagnant toroidal effect, prevents that the pilot tone that intensity is in critical value from getting into and withdrawing from active set repeatedly, thereby saves overhead.

With the initial data in the table 1 is example, and makes Margin=0.25dB, and the handoff parameter that the method for employing present embodiment is calculated is as shown in table 3:

Table 3

Time	The intensity of pilot tone A	The intensity of pilot tone B	The T_DROP of pilot tone A *	The T_DROP of pilot tone B *	T_ADD *	Pilot tone A	Pilot tone B
								1	-3.70	-17.00	——	——	-10.74	Active	Neighbor
2	-3.80	-16.00	——	——	-10.83	Active	Neighbor
								3	-3.90	-15.00	——	——	-10.91	Active	Neighbor
4	-4.00	-14.00	——	——	-11.00	Active	Neighbor
								5	-4.25	-13.00	——	——	-11.22	Active	Candidate
6	-4.50	-12.00	——	——	-11.44	Active	Candidate
								7	-4.75	-11.00	——	——	-11.66	Active	Candidate
8	-5.00	-10.00	——	-11.08	-10.83	Active	Active
								9	-5.50	-9.00	——	-11.16	-10.91	Active	Active
10	-6.00	-8.00	——	-11.25	-10.89	Active	Active
								11	-7.00	-7.00	——	——	-10.99	Active	Active
12	-8.00	-6.00	-11.25	——	-10.89	Active	Active
								13	-9.00	-5.50	-11.16	——	-10.91	Active	Active
14	-10.00	-5.00	-11.08	——	-10.83	Active	Active
								15	-11.00	-4.75	-11.10	——	-10.85	Active	Active
16	-12.00	-4.50	-11.07	——	-10.82	Active	Active
								17	-13.00	-4.25	——	——	-11.22	Candidate	Active
18	-14.00	-4.00	——	——	-11.00	Candidate	Active
								19	-15.00	-3.90	——	——	-10.91	Candidate	Active
20	-16.00	-3.80	——	——	-10.83	Neighbor	Active
								21	-17.00	-3.70	——	——	-10.74	Neighbor	Active

Fig. 7 is that Fig. 7 uses the data in the table 3 according to the sketch map of the dynamic deletion pilot threshold setting of the embodiment of the invention two.As shown in Figure 7, any moment T_DROP ^*Thresholding all is not more than T_ADD ^*Thresholding has well solved the thresholding phenomena of inversion;

And the setting through Margin can prevent that the pilot tone that intensity is in critical value from getting into and withdrawing from active set repeatedly, saved overhead.

Embodiment three

With

As independent variable, with T_DROP ^*As functional value, according to T_DROP ^*Thresholding is near T_ADD ^*The degree of thresholding adopts and divides slope over 10 and intercept, and figure is a sectional broken line.In the present embodiment, be that example describes with three sections broken lines.

Fig. 8 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention three.As shown in Figure 8, preset 3 Margin parameters, wherein Margin1>Margin2>Margin3; Work as T_DROP ^*Thresholding is lower than T_ADD ^*Thresholding is above Margin1 or at initial calculation T_DROP ^*The time, T_DROP ^*The slope of function and intercept are respectively k1 and b1; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding Margin1～Margin2, T_DROP ^*The slope of function and intercept are respectively k2 and b2; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding Margin2～Margin3, T_DROP ^*The slope of function and intercept are respectively k3 and b3; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding deficiency Margin3, make T_DROP ^*=T_ADD ^*-Margin3.Wherein slope k 1, k2, k3, intercept b1, b2, b3, Margin1, Margin2, Margin3 can be controlled by operator as switching relevant system parameters.The flexible configuration T_DROP as required of operator like this ^*The shape of function, optimization of system performance.

Fig. 9 is the flow chart according to the soft handover method of the embodiment of the invention three, and is as shown in Figure 9, and this method comprises the steps:

Step S902 initially carries out T_DROP ^*During calculating, make slope and intercept be respectively k1, b1, preset Margin1>Margin2>Margin3;

Step S904 is to step S906, the T_DROP that relatively calculates ^*Whether less than (T_ADD ^*-Margin1): if then keep k1, b1 constant; Otherwise, execution in step S908;

Step S908 compares T_DROP to step S910 ^*Whether thresholding is less than (T_ADD ^*-Margin2): if then make intercept and slope be respectively k2, b2; Otherwise, execution in step S912;

Step S912 compares T_DROP to step S914 ^*Whether thresholding is less than (T_ADD ^*-Margin3): if then make intercept and slope be respectively k3, b3; Otherwise, execution in step S916;

Step S916 is provided with T_DROP ^*=T_ADD ^*-Margin3;

Step S918 judges to step S920 whether handoff procedure finishes: if do not finish, then calculate new T_DROP ^*And execution in step S904 again.

Embodiment four

Figure 10 is the sketch map according to the dynamic deletion pilot threshold setting of the embodiment of the invention four.Shown in figure 10, the image of quadratic function has extreme value, can utilize this characteristic better controlled T_DROP ^*Thresholding is not more than T_ADD ^*Thresholding.Revise T_DROP ^*Dynamic threshold algorithm is:

When $10\mathrm{<figure-callout\; id="10"\; label="Lo\; g"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Lo</figure-callout>}{g}_{}{}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j<h$ The time,

$T\_{\mathrm{DROP}}^{*}=\max (-a\&times;{(10{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j-h)}^2+k,-\frac{T\_\mathrm{DROP}}{2});$

When $10\mathrm{<figure-callout\; id="10"\; label="Lo\; g"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Lo</figure-callout>}{g}_{}{}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j>h$ The time,

$T\_{\mathrm{DROP}}^{*}=\max (T\_{\mathrm{ADD}}^{*}-M\arg \mathrm{in},-\frac{T\_\mathrm{DROP}}{2});$

Wherein, a, h, Margin are the controlled parameter of operator, a>0, k=T_ADD ^*-M argin.When

During less than h, greater than

Situation under, T_DROP ^*The quadratic function part maximum of thresholding is k.When

During greater than h, for fear of T_DROP ^*Thresholding along with

Increase and reduce (dotted line that the parabola shown in figure 10 right side is half section), regulation T_DROP at this moment ^*=T_ADD ^*-Margin.Operator can effectively adjust T_DROP through the value of adjustment a, h, Margin ^*The shape of function, optimization of system performance.

Figure 11 is the flow chart according to the soft handover method of the embodiment of the invention four, and is shown in figure 11, and this method may further comprise the steps:

Step S1102 is to step S1104, and the terminal relatively

Whether less than h: if then be provided with $T\_{\mathrm{DROP}}^{*}=\mathrm{Max}(-a\&times;{(10{\mathrm{<figure-callout\; id="10"\; label="Log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j-h)}^2+k,-\frac{T\_\mathrm{DROP}}{2});$

Step S1106, otherwise T_DROP is set ^*=T_ADD ^*-Margin;

Step S1108 judges to step S1110 whether handoff procedure finishes: if do not finish, then calculate new T_DROP ^*And execution in step S1102.

Through the above embodiment of the present invention, make dynamic deletion pilot threshold all the time less than dynamically adding pilot threshold, be inverted problem so overcome thresholding, and then reached the effect of conserve system resources.

According to the embodiment of the invention, a kind of soft handover device is proposed also.

Figure 12 is that this device is used for the CDMA2000 network, and is shown in figure 12 according to the block diagram of the soft handover device of the embodiment of the invention, and this device comprises:

Pre-set module 10, be used to set in advance dynamic deletion pilot threshold and dynamically add pilot threshold;

First is provided with module 20, is connected to and pre-sets module 10, be used for when dynamic deletion pilot threshold when dynamically adding pilot threshold, the value that dynamic deletion pilot threshold is set is for less than the value of dynamically adding the value of pilot threshold;

Second is provided with module 30, is connected to first module 20 is set, and is used for when dynamically the deletion pilot threshold is also less than static state deletion pilot threshold, the value of the value of dynamic deletion pilot threshold for static deletion pilot threshold being set;

Soft switching module 40 is connected to second module 30 is set, and carries out soft handover according to dynamic deletion pilot threshold that is provided with and the dynamic pilot threshold of adding.

Wherein, pre-set module 10 and may further include: dynamically delete pilot threshold module is set, be used for being provided with $T\_{\mathrm{DROP}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="Log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Log</figure-callout>}}_{10}\underset{j\&Element;A^P{S}_j>P{S}_k}{\mathrm{\&Sigma;}}P{S}_j+\frac{\mathrm{DROP}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2};$ Dynamically add pilot threshold module is set, be used for being provided with $T\_{\mathrm{ADD}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{<figure-callout\; id="8"\; label="SLOPE"\; filenames="H2008102143358E00012.png"\; state="\{\{state\}\}">SLOPE</figure-callout>}}{8}\&times;10{\mathrm{<figure-callout\; id="10"\; label="Log"\; filenames="H2008102143358E00071.png,H2008102143358E00091.png"\; state="\{\{state\}\}">Log</figure-callout>}}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}P{S}_i+\frac{\mathrm{ADD}\_\mathrm{<figure-callout\; id="2"\; label="INTERCEPT"\; filenames="H2008102143358E00051.png,H2008102143358E00091.png"\; state="\{\{state\}\}">INTERCEPT</figure-callout>}}{2};$ Wherein, SOFT_SLOPE representes slope,

The intensity sum of all pilot tones in the expression active set,

Intensity is greater than waiting to delete pilot tone PS in the expression active set _kAll pilot frequency intensity sums.

And first is provided with the dynamic deletion pilot threshold T_DROP that module 20 is provided with ^*=min (T_DROP ^*, T_ADD ^*-M argin), second the dynamic deletion pilot threshold that module 30 is provided with is set $T\_{\mathrm{DROP}}^{*}=\mathrm{Max}(T\_{\mathrm{DROP}}^{*},-\frac{T\_\mathrm{DROP}}{2}),$ Wherein, Margin is the allowance parameter.

In addition; Under the situation of value of the parameter DROP_INTERCEPT that comes automatic network greater than the value of parameter A DD_INTERCEPT; First is provided with module 20 also is used for: the value that parameter DROP_INTERCEPT is set equals the value of parameter A DD_INTERCEPT; Wherein, DROP_INTERCEPT representes to delete the intercept of pilot tone, and ADD_INTERCEPT representes to add the intercept of pilot tone.

From above description, can find out that the present invention has realized following technique effect:

1. avoided the thresholding phenomena of inversion effectively;

2. prevent that the pilot tone that intensity is in critical value from getting into and withdrawing from active set repeatedly, practiced thrift overhead;

3. flexible configuration is dynamically deleted pilot threshold as required, has optimized systematic function.

Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, 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. a soft handover method that is used for the CDMA2000 network is characterized in that, may further comprise the steps:

Dynamic deletion pilot threshold is set and dynamically adds pilot threshold;

When said dynamic deletion pilot threshold during greater than said dynamic interpolation pilot threshold, the value that said dynamic deletion pilot threshold is set is the value less than the value of said dynamic interpolation pilot threshold;

When said dynamic deletion pilot threshold was also deleted pilot threshold less than static state, the value that said dynamic deletion pilot threshold is set was the value of said static deletion pilot threshold;

Said dynamic deletion pilot threshold and said dynamic interpolation pilot threshold according to being provided with are carried out soft handover;

Wherein, When said dynamic deletion pilot threshold during greater than said dynamic interpolation pilot threshold; The value that said dynamic deletion pilot threshold is set specifically comprises for the value less than the value of said dynamic interpolation pilot threshold: preset 3 Margin parameters, wherein Margin1＞Margin2＞Margin3; Work as T_DROP ^*Thresholding is lower than T_ADD ^*Thresholding is above Margin1 or at initial calculation T_DROP ^*The time, T_DROP ^*The slope of function and intercept are respectively k1 and b1; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding Margin1～Margin2, T_DROP ^*The slope of function and intercept are respectively k2 and b2; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding Margin2～Margin3, T_DROP ^*The slope of function and intercept are respectively k3 and b3; Work as T_DROP ^*Thresholding is lower than T_ADD ^*During thresholding deficiency Margin3, said dynamic deletion pilot threshold T_DROP is set ^*=T_ADD ^*-Margin3; T_DROP wherein ^*Be said dynamic deletion pilot threshold, T_ADD ^*Be said dynamic interpolation pilot threshold, Margin is the allowance parameter, slope k 1, k2, k3, and intercept b1, b2, b3, Margin1, Margin2, Margin3 are preset value.

2. based on the described method of claim 1, it is characterized in that, dynamic deletion pilot threshold be set specifically comprise with the dynamic pilot threshold of adding:

Dynamic deletion pilot threshold

is set

Dynamic interpolation pilot threshold is set ${T\_\mathrm{ADD}}^{*}=\frac{\mathrm{SOFT}\_\mathrm{SLOPE}}{8}\&times;{10\mathrm{Log}}_{10}\underset{i\&Element;A}{\mathrm{\&Sigma;}}{\mathrm{PS}}_i+\frac{\mathrm{ADD}\_\mathrm{INTERCEPT}}{2};$

Wherein, SOFT_SLOPE representes slope,

The intensity sum of all pilot tones in

expression active set

Intensity is greater than waiting to delete pilot tone PS in the expression active set _kAll pilot frequency intensity sums.

3. based on the described method of claim 1, it is characterized in that when said dynamic deletion pilot threshold was also deleted pilot threshold less than static state, the value that said dynamic deletion pilot threshold is set was that the value of said static deletion pilot threshold specifically comprises:

Said dynamic deletion pilot threshold is set ${T\_\mathrm{DROP}}^{**}=\mathrm{Max}({T\_\mathrm{DROP}}^{*},-\frac{T\_\mathrm{DROP}}{2}).$

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