CN101482573A - Detection method and apparatus for terminal high-speed moving state - Google Patents

Abstract

The invention provides a high-speed mobile terminal state detection method and device, comprising the following steps: A. recording an automatic frequency control value of a terminal in each preset recording period; B. calculating a maximum frequency value and a minimum frequency value according to the recorded automatic frequency control values; C. determining whether the terminal is at high-speed mobile state or not according to the difference of the maximum frequency value and the minimum frequency value. The detection method accurately detects whether the terminal is at high-speed mobile state or not and the detection method is simple and agile. The detection method also comprises: setting the terminal automatic frequency control based on the maximum frequency value and the minimum frequency value when the terminal is at high-speed mobile state and the district switch or reelection occurs. The detection method solves the problem of frequency jump due to district switch or reelection when the terminal is at high-speed mobile state.

Description

A kind of detection method of high speed moving state of terminal and device

Technical field

The invention belongs to wireless communication technology field, particularly a kind of detection method of high speed moving state of terminal and device.

Background technology

In cellular communication system, terminal is followed the tracks of the frequency of carrier wave by AFC (automatic frequency control), and then finishes receiving the correct demodulation of data.In mobile environment, the translational speed of terminal can cause Doppler shift, and Doppler shift will directly cause the frequency change of reception carrier.Usually, terminal moves fast more, and Doppler shift is big more, and the frequency change of reception carrier is also fast more.

Under the high-speed mobile scene, for the frequency change that correct demodulating data just needs terminal AFC can follow the tracks of carrier wave quickly, the loop bandwidth of AFC adjustment should more for example use big AFC to adjust step-length so.Under the high-speed mobile scene, environment will compare spaciousness usually, and the direct projection composition in the received signal is higher, helps improving the order of accuarcy of Nonlinear Transformation in Frequency Offset Estimation, like this, even the loop bandwidth of AFC can not cause the instability of the local frequency of terminal greatly yet.If but also using bigger loop bandwidth to adjust AFC under the mobile scene at a slow speed, owing to have more scatterer usually in the environment at a slow speed, this moment, the direct projection composition in the received signal was lower even do not have, this just makes that the order of accuarcy of Nonlinear Transformation in Frequency Offset Estimation is relatively low, the AFC adjustment that loop bandwidth is bigger can cause that the local carrier frequency shake of terminal is bigger, instability influences the demodulation performance of terminal.

Therefore, need a kind of technical scheme to come the current high-speed moving state that whether is in of identification terminal.After identifying terminal present located state, just can decide the adjustment modes of using which kind of AFC, thereby make the demodulation performance of terminal reach optimum according to terminal present located state.

Summary of the invention

Technical matters to be solved by this invention provides a kind of detection method and device of high speed moving state of terminal.

For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:

A kind of detection method of high speed moving state of terminal comprises: the intensity of variation according to the automatic frequency control value of terminal determines whether terminal is in high-speed moving state.

Above-mentioned method wherein, determines according to the intensity of variation of the automatic frequency control value of terminal whether terminal is in high-speed moving state and specifically comprises: A, in each predetermined recording in the cycle, every the automatic frequency control value of a terminal of schedule time record; B, calculate a maximum frequency values and a minimum frequency value according to the automatic frequency control value of described record; C, determine according to the difference of described maximum frequency values and minimum frequency value whether described terminal is in high-speed moving state.

Above-mentioned method, wherein, the described schedule time is the sleep cycle of described terminal.

Above-mentioned method among the step B, is got maximal value in the automatic frequency control value of record in a nearest record cycle and minimum value respectively as described maximum frequency values and minimum frequency value.

Above-mentioned method among the step B, is calculated described maximum frequency values f according to following formula _MaxWith minimum frequency value f _Min:

$f_{\max }=(1-\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{\mathrm{\β}}^i)f_{\max ,0}+\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{\mathrm{\β}}^i{f}_{\max ,-i}$

$f_{\min }=(1-\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{\mathrm{\β}}^i)f_{\min ,0}+\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{\mathrm{\β}}^i{f}_{\min ,-i}$

Wherein, f _{Max, 0}, f _{Min, 0}Be respectively in the automatic frequency control value of record in a nearest record cycle maximal value and minimum value, f _{Max ,-i}, f _{Min ,-i}Be respectively maximal value and minimum value in the automatic frequency control value that writes down in preceding i the record cycle in a nearest record cycle, β is a forgetting factor, $\mathrm{\&beta;}>0,\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i<1,$ M is the integer greater than 0.

Above-mentioned method, wherein, step C specifically comprises: whether the difference of judging described maximum frequency values and minimum frequency value greater than default thresholding, if, determine that then described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

Above-mentioned method, wherein, step C specifically comprises: whether the α of difference that judges described maximum frequency values and minimum frequency value is doubly greater than default thresholding, wherein, 0.8＜α＜1, if, determine that then described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

Above-mentioned method wherein, also comprises: be in high-speed moving state in terminal, and take place that the sub-district is switched or during district reselecting, according to automatic frequency control the carrying out set to terminal of described maximum frequency values and minimum frequency value.

Above-mentioned method wherein, is carried out set according to described maximum frequency values and minimum frequency value to the automatic frequency control of terminal and is: gets automatic frequency control the carry out set of the average of described maximum frequency values and minimum frequency value to terminal.

Above-mentioned method, wherein, according to described maximum frequency values and minimum frequency value set being carried out in the automatic frequency control of terminal is: calculate described maximum frequency values and the automatic frequency control value of the last record difference thoroughly deserve first difference, calculate the automatic frequency control value of the last record and described minimum frequency value difference thoroughly deserve second difference, in first difference during greater than second difference, with of automatic frequency control the carry out set of described maximum frequency values to terminal, when first difference is not more than second difference, with of automatic frequency control the carry out set of described minimum frequency value to terminal.

A kind of pick-up unit of high speed moving state of terminal, described device determines according to the intensity of variation of the automatic frequency control value of terminal whether terminal is in high-speed moving state.

Above-mentioned device comprises: the slip register is used in each predetermined recording in the cycle, every the automatic frequency control value of a terminal of schedule time record; Be worth most counter, be used for calculating a maximum frequency values and a minimum frequency value according to the automatic frequency control value of described record; State judging is used for determining according to the difference of described maximum frequency values and minimum frequency value whether described terminal is in high-speed moving state.

The present invention can detect exactly whether terminal is current is in high-speed moving state, and implementation is simple, flexible.After detecting terminal present located state, just can decide the adjustment modes of using which kind of AFC, thereby make the demodulation performance of terminal reach optimum according to terminal present located state.Further, can also solve terminal and be under the high-speed moving state, the frequency hopping problem that when sub-district switching or district reselecting take place, causes.

Description of drawings

Fig. 1 is that the Da Qu of BBU+RRU covers principle schematic;

Fig. 2 is under the high-speed mobile scene, the frequency change that terminal moves between two RRU in same sub-district and take place that the sub-district is switched or the synoptic diagram of the frequency hopping during district reselecting;

Fig. 3 is the pick-up unit structural representation of the high speed moving state of terminal of the embodiment of the invention;

Fig. 4 is the pick-up unit structural representation of the high speed moving state of terminal of another embodiment of the present invention;

Fig. 5 is the detection method process flow diagram of the high speed moving state of terminal of the embodiment of the invention.

Embodiment

For the ease of the understanding of the present invention, specifically describe the carrier frequency variation of terminal received signal under high-speed moving state below and take place that the sub-district is switched or the frequency hopping problem during district reselecting.

Under the high-speed mobile scene, cellular communication system can adopt bigger sub-district to cover.At present, the cloth net mode of BBU+RRU (BBU:Base Band Unit Base Band Unit, RRU:Remote Radio Unit far-end radio-cell) is to solve a kind of effective ways that Da Qu covers.Its principle as shown in Figure 1, be the signals of a plurality of RRU emissions from same BBU, that is to say that these a plurality of RRU belong to same logic district, its function is equivalent to many antennas of same base station, but each other can a good distance off, cover so on a large scale and just can realize.

Though this cloth station mode can solve the frequent problem of switching of user, another problem that it causes is, during high-speed mobile, Doppler shift changes rapidly the user between adjacent RRU.As shown in Figure 1, 2, when terminal is mobile in the RRU interval that belongs to same logic district, because the Doppler shift that terminal velocity causes can change between [fd, fd] fast continuously; When terminal adheres to separately between the different logic district RRU when mobile at adjacent two, the sub-district can take place switch (terminal is in connection mode) or district reselecting (terminal is in idle pulley), this moment, Doppler shift can change to fd from-fd in moment, that is to say, terminal can introduced the frequency deviation of 2fd in a flash, this will have a strong impact on the demodulation performance of terminal, the more important thing is, big like this frequency deviation can exceed the limit of power of terminal frequency offset estimating, cause the terminal again can't the proper solution adjusting data, can only call drop (connection mode).

Based on above-mentioned analysis, the scheme that the embodiment of the invention adopts is to judge according to the intensity of variation of terminal AFC value in the regular period whether terminal is in high-speed moving state, if the intensity of variation of AFC value is bigger, determine that then terminal is in high-speed moving state, otherwise, determine that terminal is in non-high-speed moving state.

With reference to Fig. 3, the pick-up unit of the high speed moving state of terminal of the embodiment of the invention mainly comprises: slip register 10, be worth counter 20 and state judging 30 most.

Slip register 10 was used in each predetermined recording in the cycle, every the AFC value of a terminal of schedule time record.

It is the cyclic store of N that slip register 10 can adopt length, and it is the value of an AFC of TI record at regular intervals, N AFC value of record in a record period T A (promptly refreshing the required time of cyclic store No. a time).The value of AFC is meant, the frequency of the control word correspondence of terminal AFC.The value of TI can be provided with flexibly, and the concrete size of its value is relevant with the residing state of current terminal.When terminal is in connection mode, the continuous received signal of terminal, this value can preestablish.When terminal is in disconnected pattern, there is a sleep cycle, this cycle length is by network side configuration decision, and sleep cycle is specially 0.64s, 1.28s, 2.56s, 5.12s.That is to say that this moment, terminal will could receive signal one time every certain sleep cycle, the value of an AFC of record, TI so at this moment is exactly in four kinds of sleep cycles.Certainly, simple for making implementation, when terminal is in connection mode, also can TI be set in the described sleep cycle.

As a kind of embodiment, N can be made as 128, and TA is made as 81.92s.When terminal was in connection mode, TI was made as 0.64s, and when terminal was in disconnected pattern, TI was the current sleep cycle of terminal.Connect or notconnect state for guaranteeing no matter terminal is in, cyclic store writes down the AFC data in the nearest time period TA=81.92s all the time, can adopt following code to realize:

Initialization when writing down for the first time:

k＝0

i＝0

for(j＝0；j<128；j++)

B[j]＝f _i

end

k＝k+TI _i/0.64

i＝i+1

That is, when writing down for the first time, at each storage unit B[j of cyclic store], j=1,2 ..., all store f among the N ₀

Begin for the second time, later recording mode is:

for(j＝0；j<TI _i/0.64；j++)

B[(k+j)％128]＝f _i

end

k＝k+TI _i/0.64

i＝i+1

That is, if terminal is in disconnected pattern, current sleep cycle is TI _i, then in cyclic store, store TI _i/ 0.64 f _i, can guarantee that so just cyclic store writes down the AFC data in the nearest time period TA=81.92s all the time.

Need to prove that above-mentioned code provides is a kind of preferable recording mode to the AFC value, it does not constitute limiting the scope of the invention.

Be worth most counter 20, be used for calculating a maximum frequency values f according to the AFC value of described record _MaxWith a minimum frequency value f _MinBelow provide two kinds of modes of calculating maximum frequency values and minimum frequency value, same, the present invention is not limited to this dual mode.

Mode one, get maximal value in the AFC value of record in a nearest record cycle and minimum value respectively as described maximum frequency values and minimum frequency value:

f _max＝max{B}

f _min＝min{B}

Wherein, { B} is the set of the AFC value of cyclic store storage in the nearest record cycle.

Mode two according to the maximal value and the minimum value of the AFC value that writes down in the cycle of preceding M record in a nearest record cycle and a nearest record cycle, is calculated current f _MaxWith value f _Min, to increase stability:

$f_{\max }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\max ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\max ,-i}$

$f_{\min }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\min ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\min ,-i}$

Wherein, f _{Max, 0}, f _{Min, 0}Be respectively in the AFC value of record in a nearest record cycle maximal value and minimum value, f _{Max ,-i}, f _{Min ,-i}Be respectively maximal value and minimum value in the AFC value that writes down in preceding i the record cycle in a nearest record cycle, β is a forgetting factor, $\mathrm{\&beta;}>0,\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i<1,$ M is the integer greater than 0.

State judging 30 is used for according to described maximum frequency values f _MaxWith minimum frequency value f _MinDifference determine whether described terminal is in high-speed moving state.

State judging 30 is calculated f _MaxWith f _MinDifference, judge that whether described difference is greater than default thresholding T _DifIf,, determine that then terminal is in high-speed moving state, otherwise, determine that terminal is in non-high-speed moving state:

if?f _max-f _min>T _dif

High-speed moving state

else

Non-high-speed moving state

end

T _DifA kind of method to set up be: if think that moving velocity of terminal is high-speed moving state, T so when being x km/h in implementing _DifCan be set to 3.7x Hz.For example, be high-speed moving state, T so when translational speed is for 100km/h if think _DifCan be set to 370Hz.

Occur the situation of flase drop when preventing that channel circumstance is relatively poor,, can improve this situation by a parameter alpha, promptly as a kind of prioritization scheme

if?α(f _max-f _min)>T _dif

High-speed moving state

else

Non-high-speed moving state

end

The span of parameter alpha is 0＜α≤1, and the more little high-speed moving state difficult to get access more of α though can help to lower probability of false detection, has also increased false dismissal probability simultaneously.So this value is advisable between 0.8～1 in the practical application.

After device by the foregoing description detects terminal present located state, just can determine to use the adjustment modes of which kind of AFC, if i.e.: the current high-speed moving state that is in of terminal, then use the bigger AFC adjustment modes of loop bandwidth, be in non-high-speed moving state if terminal is current, then use the less AFC adjustment modes of loop bandwidth.Like this, can make the demodulation performance of terminal reach optimum, thereby improve communication quality.

In another embodiment of the present invention, can also solve terminal and be under the high-speed moving state, the frequency hopping problem that terminal causes when sub-district switching or district reselecting take place.

With reference to Fig. 4, the pick-up unit of the high speed moving state of terminal of another embodiment of the present invention mainly comprises: slip register 10, be worth counter 20, state judging 30 and set device 40 most.

Slip register 10, be worth counter 20, state judging 30 most function and Fig. 3 in identical, set device 40 is wherein only described here.

Set device 40 is used for being in high-speed moving state in terminal, and takes place that the sub-district is switched or during district reselecting, according to described maximum frequency values f _MaxWith minimum frequency value f _MinAFC to terminal carries out set, to weaken the influence of Doppler shift.Two kinds of preferable set methods are provided here:

A kind of is the method for average set,, gets described maximum frequency values f that is _MaxWith minimum frequency value f _MinAverage the AFC of terminal is carried out set:

$f_{\mathrm{reset}}=\frac{f_{\max }+f_{\min }}{2}$

Another is the method that oppositely is worth most set,, calculates f that is _MaxAFC value f with the last time record _LatestDifference thoroughly deserve first difference, calculate f _LatestWith f _MinDifference thoroughly deserve second difference, during greater than second difference, use f in first difference _MaxAFC to terminal carries out set, when first difference is not more than second difference, uses f _MinAFC to terminal carries out set:

if|f _latest-f _max|>|f _latest-f _min|

f _reset＝f _max

else

f _reset＝f _min

So-called AFC to terminal carries out set and is meant, according to f _ResetSearch corresponding frequency control word, with the frequency control word that finds control word as the AFC of terminal.

With reference to Fig. 5, the embodiment of the invention also provides a kind of detection method of high speed moving state of terminal, mainly comprises the steps:

Step 501: in the cycle, write down the AFC value of a terminal every the schedule time in each predetermined recording;

Can adopt length is the cyclic store of N, and it is the value of an AFC of TI record at regular intervals, N AFC value of record in a record period T A (promptly refreshing the required time of cyclic store No. a time).The value of AFC is meant, the frequency of the control word correspondence of terminal AFC.The value of TI can be provided with flexibly, and the concrete size of its value is relevant with the residing state of current terminal.When terminal is in connection mode, the continuous received signal of terminal, this value can preestablish.When terminal is in disconnected pattern, there is a sleep cycle, this cycle length is by network side configuration decision, and sleep cycle is specially 0.64s, 1.28s, 2.56s, 5.12s.That is to say that this moment, terminal will could receive signal one time every certain sleep cycle, the value of an AFC of record, TI so at this moment is exactly in four kinds of sleep cycles.Certainly, simple for making implementation, when terminal is in connection mode, also can TI be set in the described sleep cycle.

Step 502: the AFC value according to described record is calculated a maximum frequency values f _MaxWith a minimum frequency value f _Min

Below provide two kinds of modes of calculating maximum frequency values and minimum frequency value.

Mode one, get maximal value in the AFC value of record in a nearest record cycle and minimum value respectively as described maximum frequency values and minimum frequency value:

f _max＝max{B}

f _min＝min{B}

Wherein, { B} is the set of the AFC value of cyclic store storage in the nearest record cycle.

Mode two according to the maximal value and the minimum value of the AFC value that writes down in the cycle of preceding M record in a nearest record cycle and a nearest record cycle, is calculated current f _MaxWith value f _Min, to increase stability:

$f_{\max }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\max ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\max ,-i}$

$f_{\min }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\min ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\min ,-i}$

Wherein, f _{Max, 0}, f _{Min, 0}Be respectively in the AFC value of record in a nearest record cycle maximal value and minimum value, f _{Max ,-i}, f _{Min ,-i}Be respectively maximal value and minimum value in the AFC value that writes down in preceding i the record cycle in a nearest record cycle, β is a forgetting factor, β〉0, $\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i<1,$ M is the integer greater than 0.

Step 503: according to described maximum frequency values f _MaxWith minimum frequency value f _MinDifference determine whether described terminal is in high-speed moving state;

At first calculate f _MaxWith f _MinDifference, judge that then whether described difference is greater than default thresholding T _DifIf,, determine that then terminal is in high-speed moving state, otherwise, determine that terminal is in non-high-speed moving state:

if?f _max-f _min>T _dif

High-speed moving state

else

Non-high-speed moving state

end

T _DifA kind of method to set up be: if think that moving velocity of terminal is high-speed moving state, T so when being x km/h in implementing _DifCan be set to 3.7x Hz.For example, be high-speed moving state, T so when translational speed is for 100km/h if think _DifCan be set to 370Hz.

Occur the situation of flase drop when preventing that channel circumstance is relatively poor,, can improve this situation by a parameter alpha, promptly as a kind of prioritization scheme

if?α(f _max-f _min)>T _dif

High-speed moving state

else

Non-high-speed moving state

end

The span of parameter alpha is 0＜α≤1, and the more little high-speed moving state difficult to get access more of α though can help to lower probability of false detection, has also increased false dismissal probability simultaneously.So this value is advisable between 0.8～1 in the practical application.

Step 504: be in high-speed moving state in terminal, and take place that the sub-district is switched or during district reselecting, according to described maximum frequency values f _MaxWith minimum frequency value f _MinAFC to terminal carries out set.This step is an optional step, is to be under the high-speed moving state in order to solve terminal the frequency hopping problem that terminal causes when sub-district switching or district reselecting take place.Two kinds of preferable set methods are provided here:

A kind of is the method for average set,, gets described maximum frequency values f that is _MaxWith minimum frequency value f _MinAverage the AFC of terminal is carried out set:

$f_{\mathrm{reset}}=\frac{f_{\max }+f_{\min }}{2}$

Another is the method that oppositely is worth most set,, calculates f that is _MaxAFC value f with the last time record _LatestDifference thoroughly deserve first difference, calculate f _LatestWith f _MinDifference thoroughly deserve second difference, during greater than second difference, use f in first difference _MaxAFC to terminal carries out set, when first difference is not more than second difference, uses f _MinAFC to terminal carries out set:

if|f _latest-f _max|>|f _latest-f _min|

f _reset＝f _max

else

f _reset＝f _min

In sum, the present invention can detect exactly whether terminal is current is in high-speed moving state, and implementation is simple, flexible.After detecting terminal present located state, just can decide the adjustment modes of using which kind of AFC, thereby make the demodulation performance of terminal reach optimum according to terminal present located state.Further, can also solve terminal and be under the high-speed moving state, the frequency hopping problem that when sub-district switching or district reselecting take place, causes.

Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (20)

1. the detection method of a high speed moving state of terminal is characterized in that, comprising:

Intensity of variation according to the automatic frequency control value of terminal determines whether terminal is in high-speed moving state.

2. the method for claim 1 is characterized in that, determines according to the intensity of variation of the automatic frequency control value of terminal whether terminal is in high-speed moving state and specifically comprises:

A, in each predetermined recording in the cycle, every the automatic frequency control value of a terminal of schedule time record;

B, calculate a maximum frequency values and a minimum frequency value according to the automatic frequency control value of described record;

C, determine according to the difference of described maximum frequency values and minimum frequency value whether described terminal is in high-speed moving state.

3. method as claimed in claim 2 is characterized in that:

The described schedule time is the sleep cycle of described terminal.

4. method as claimed in claim 2 is characterized in that:

Among the step B, get maximal value in the automatic frequency control value of record in a nearest record cycle and minimum value respectively as described maximum frequency values and minimum frequency value.

5. method as claimed in claim 2 is characterized in that:

Among the step B, calculate described maximum frequency values f according to following formula _MaxWith minimum frequency value f _Min:

$f_{\max }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\max ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\max ,-i}$

$f_{\min }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\min ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\min ,-i}$

Wherein, f _{Max, 0}, f _{Min, 0}Be respectively in the automatic frequency control value of record in a nearest record cycle maximal value and minimum value, f _{Max ,-i}, f _{Min ,-i}Be respectively maximal value and minimum value in the automatic frequency control value that writes down in preceding i the record cycle in a nearest record cycle, β is a forgetting factor, β〉0, $\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i<1,$ M is the integer greater than 0.

6. method as claimed in claim 2 is characterized in that step C specifically comprises:

Whether the difference of judging described maximum frequency values and minimum frequency value greater than default thresholding, if, determine that then described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

7. method as claimed in claim 2 is characterized in that step C specifically comprises:

Whether the α of difference that judges described maximum frequency values and minimum frequency value doubly greater than default thresholding, wherein, 0.8＜α＜1, if then definite described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

8. as each described method in the claim 1 to 7, it is characterized in that, also comprise:

Be in high-speed moving state in terminal, and take place that the sub-district is switched or during district reselecting, according to automatic frequency control the carrying out set of described maximum frequency values and minimum frequency value terminal.

9. method as claimed in claim 8 is characterized in that, according to described maximum frequency values and minimum frequency value set is carried out in the automatic frequency control of terminal to be:

Get of automatic frequency control the carry out set of the average of described maximum frequency values and minimum frequency value to terminal.

10. method as claimed in claim 8 is characterized in that, according to described maximum frequency values and minimum frequency value set is carried out in the automatic frequency control of terminal to be:

Calculate described maximum frequency values and the automatic frequency control value of the last record difference thoroughly deserve first difference, calculate the automatic frequency control value of the last record and described minimum frequency value difference thoroughly deserve second difference, in first difference during greater than second difference, with of automatic frequency control the carry out set of described maximum frequency values to terminal, when first difference is not more than second difference, with of automatic frequency control the carry out set of described minimum frequency value to terminal.

11. the pick-up unit of a high speed moving state of terminal is characterized in that:

Described device determines according to the intensity of variation of the automatic frequency control value of terminal whether terminal is in high-speed moving state.

12. device as claimed in claim 11 is characterized in that, comprising:

The slip register was used in each predetermined recording in the cycle, every the automatic frequency control value of a terminal of schedule time record;

Be worth most counter, be used for calculating a maximum frequency values and a minimum frequency value according to the automatic frequency control value of described record;

State judging is used for determining according to the difference of described maximum frequency values and minimum frequency value whether described terminal is in high-speed moving state.

13. device as claimed in claim 12 is characterized in that:

The described schedule time is the sleep cycle of described terminal.

14. device as claimed in claim 12 is characterized in that:

The described counter that is worth most is further used for, and gets maximal value in the automatic frequency control value of record in a nearest record cycle and minimum value respectively as described maximum frequency values and minimum frequency value.

15. device as claimed in claim 12 is characterized in that:

The described counter that is worth most is further used for, and calculates described maximum frequency values f according to following formula _MaxWith minimum frequency value f _Min:

$f_{\max }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\max ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\max ,-i}$

$f_{\min }=(1-\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i)f_{\min ,0}+\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i{f}_{\min ,-i}$

Wherein, f _{Max, 0}, f _{Min, 0}Be respectively in the automatic frequency control value of record in a nearest record cycle maximal value and minimum value, f _{Max ,-i}, f _{Min ,-i}Be respectively maximal value and minimum value in the automatic frequency control value that writes down in preceding i the record cycle in a nearest record cycle, β forgetting factor, β〉0, $\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{\&beta;}}^i<1,$ M is the integer greater than 0.

16. device as claimed in claim 12 is characterized in that:

Described state judging is further used for, and whether the difference of judging described maximum frequency values and minimum frequency value greater than default thresholding, if, determine that then described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

17. device as claimed in claim 12 is characterized in that:

Described state judging is further used for, and whether the α of difference that judges described maximum frequency values and minimum frequency value is doubly greater than default thresholding, wherein, 0.8＜α＜1 is if determine that then described terminal is in high-speed moving state, otherwise, determine that described terminal is in non-high-speed moving state.

18. as each described device in the claim 11 to 17, it is characterized in that, also comprise:

The set device is used for being in high-speed moving state in terminal, and takes place that the sub-district is switched or during district reselecting, according to automatic frequency control the carrying out set to terminal of described maximum frequency values and minimum frequency value.

19. device as claimed in claim 18, its feature exists:

Described set device is further used for, and gets automatic frequency control the carry out set of the average of described maximum frequency values and minimum frequency value to terminal.

20. device as claimed in claim 18 is characterized in that:

Described set device is further used for, calculate described maximum frequency values and the automatic frequency control value of the last record difference thoroughly deserve first difference, calculate the automatic frequency control value of the last record and described minimum frequency value difference thoroughly deserve second difference, in first difference during greater than second difference, with of automatic frequency control the carry out set of described maximum frequency values to terminal, when first difference is not more than second difference, with of automatic frequency control the carry out set of described minimum frequency value to terminal.

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