CN103036609B - Adjacent region frequency deviation soft calibration method and terminal - Google Patents

Abstract

The present invention relates to the communications field, disclose a kind of adjacent region frequency deviation soft calibration method and terminal.In the present invention, the frequency deviation of the neighbor base station frequency that the FB information that record basis searches obtains and this terminal local frequency, before base band demodulating (EQ) is carried out to the data of the SB information received and BCCH, first carry out frequency deviation elimination according to the data of frequency deviation to SB information and BCCH of record.The frequency deviation making adjacent area excessive can be calibrated, and avoids causing EQ to lose efficacy because frequency deviation is excessive, thus effectively improves the success rate of neighbor synchronization.Further, can also upgrading in time, this receives the adjacent area frequency deviation after assessing, and makes the adjacent area frequency deviation value preserved truly can reflect current adjacent area frequency deviation, improves synchronous successful probability further.

Description

Adjacent region frequency deviation soft calibration method and terminal

Technical field

The present invention relates to the communications field, particularly the collimation technique of adjacent area frequency deviation.

Background technology

The cell reselection of terminal or the basis of switching are the nearby region measurements of system.The object of nearby region measurement is the synchronizing information in order to obtain adjacent area, with the condition facilitating terminal or network validation whether to meet gravity treatment or switching.With global system for mobile communications (Global System of Mobile communication, be called for short " GSM ") be example, FB (frequency calibration burst) mainly can be divided into search for for GSM nearby region measurement and SB (synchronization burst) searches for two steps.

Specifically, as shown in Figure 1, the F in Fig. 1 represents the FB information of carrying in multi-frame structure to 51 multi-frame structures of GSM, and the S in Fig. 1 represents the SB information of carrying in multi-frame structure.As can be seen here, the position that 51 multi-frame structures of GSM determine FB and SB is adjacent, therefore finds FB just can know the position of all SB in 51 multi-frames.Existing neighbor synchronization flow process as shown in Figure 2, first carry out FB search, if find FB, do not carry out frequency deviation adjustment and just directly carry out SB search, if find SB just to complete the synchronous of an adjacent area, if do not find SB just to re-start neighbor synchronization from FB search.After searching SB, search for BCCH (broadcast channel) further, base band demodulating (EQ) is carried out to the data of the SB information received and BCCH.

But, because GSM is not synchro system, and terminal crystal oscillator and Serving cell keep synchronous, find under high velocity environment during the FB of adjacent area and may there is larger frequency departure between Serving cell and adjacent area, if frequency departure is larger, even if know the position of SB, also EQ can be caused too greatly to lose efficacy due to frequency departure after next receiving SB, thus cause synchronization failure.

That is, existing method does not consider the adjacent area frequency departure data of all directly carrying out SB search, receiving SB information and BCCH whether bigger than normal after finding FB, this can reduce the successful probability of SB demodulation greatly, cause neighbor synchronization success rate on the low side, finally also can affect the success rate of terminal gravity treatment or switching.

Summary of the invention

The object of the present invention is to provide a kind of adjacent region frequency deviation soft calibration method and terminal, the frequency deviation making adjacent area excessive can be calibrated, and avoids causing because frequency deviation is excessive EQ to lose efficacy, thus effectively improves the success rate of neighbor synchronization.

For solving the problems of the technologies described above, embodiments of the present invention provide a kind of adjacent region frequency deviation soft calibration method, comprise following steps:

Terminal when carrying out nearby region measurement, if be successfully searched the frequency calibration burst FB information of adjacent area, then the frequency deviation of the neighbor base station frequency that obtains according to described FB information of described terminal record and this terminal local frequency;

Described terminal receives the data of synchronization burst SB information and broadcast channel BCCH, wherein, if the data receiver failure of SB information or BCCH, then the frequency deviation of last record lost efficacy, described terminal re-starts FB information search, and after being successfully searched FB information, again record the frequency deviation of neighbor base station frequency that the FB information that is successfully searched according to this obtains and this terminal local frequency;

According to the described frequency deviation of record, frequency deviation elimination is carried out to the data of the described SB information received and BCCH;

The data of the SB information after described frequency deviation elimination and BCCH are carried out base band demodulating.

Embodiments of the present invention additionally provide a kind of terminal, comprise:

FB search module, for when carrying out nearby region measurement, the frequency calibration burst FB information of searching neighboring area;

Frequency deviation logging modle, this frequency deviation logging modle is connected with described FB search module, for when described FB search module is successfully searched the described FB information of adjacent area, records the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to described FB information;

Receiver module, this receiver module is connected with described FB search module, for after described FB search module is successfully searched described FB information, receive the data of synchronization burst SB information and broadcast channel BCCH, wherein, the frequency deviation of described frequency deviation logging modle last time record, when the data receiver failure of SB information or BCCH, is labeled as inefficacy, again triggers described FB search module by described receiver module;

Soft alignment module, this soft alignment module is connected with described frequency deviation logging modle and described receiver module, for the described frequency deviation according to described logging modle record, carries out frequency deviation elimination to the data of the described SB information received and BCCH;

Base band demodulating module, this base band demodulating module and described soft alignment model calling, for carrying out base band demodulating by the data of the SB information after described frequency deviation elimination and BCCH.

Embodiment of the present invention in terms of existing technologies, the frequency deviation of the neighbor base station frequency that the FB information that record basis searches obtains and this terminal local frequency, before base band demodulating (EQ) is carried out to the data of the SB information received and BCCH, first carry out frequency deviation elimination according to the data of frequency deviation to SB information and BCCH of record.Due in nearby region measurement, terminal needs to receive FB, SB and BCCH, and is similar to the asynchronous system of GSM, and under high velocity environment, the difference on the frequency between Liang Ge community may alter a great deal.Therefore, by the frequency deviation of the neighbor base station frequency that will obtain when searching for FB before and this terminal local frequency as a reference, frequency deviation elimination is carried out to the data of the SB information received and BCCH.Due to the problem that frequency deviation causes too greatly EQ to lose efficacy after effectively prevent reception SB, substantially increase the successful probability of SB demodulation, thus ensure that the success rate of neighbor synchronization.And, owing to being carry out frequency deviation elimination to the data of the SB information received and BCCH, being not that frequency offset correction is carried out to terminal itself, therefore still can ensureing the synchronism of terminal crystal oscillator and Serving cell.

In addition, when carrying out base band demodulating, estimate the frequency deviation of the frequency deviation of SB information or the data of BCCH; The frequency deviation obtained according to FB information of record is added up with the frequency deviation of SB information of estimation or the frequency deviation of the data of BCCH, using the frequency deviation information of the frequency deviation after adding up as described adjacent area.Mobility due to terminal may make to produce new frequency deviation in the process receiving SB information or BCCH data, therefore, the relative frequency deviation of estimation and the frequency deviation originally recorded are added up, upgrading in time, this receives the adjacent area frequency deviation after assessing, the adjacent area frequency deviation value preserved can be made truly can to reflect current adjacent area frequency deviation, further increase synchronous successfully probability.

In addition, before carrying out adding up, whether the frequency deviation of the frequency deviation of the SB information of described estimation when first judging that adjacent area exists or the data of described BCCH is credible.If it is determined that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible, then described terminal performs described cumulative step; If it is determined that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is insincere, then described terminal is directly using the frequency deviation information of the frequency deviation obtained according to described FB information of record as described adjacent area.By carrying out the judgement of confidence level to the relative frequency deviation estimated, the accuracy of the adjacent area frequency deviation information finally obtained can be ensured.

In addition, terminal carry out switching or gravity treatment time, according to the frequency deviation information of described adjacent area, carry out automatic frequency and control calibration, to ensure the success rate of terminal gravity treatment or switching.

Accompanying drawing explanation

Fig. 1 is the 51 multi-frame structure schematic diagrames according to GSM of the prior art;

Fig. 2 is according to neighbor synchronization schematic flow sheet of the prior art;

Fig. 3 is the adjacent region frequency deviation soft calibration method flow diagram according to first embodiment of the invention;

Fig. 4 is the adjacent region frequency deviation soft calibration method flow diagram according to second embodiment of the invention;

Fig. 5 be according in second embodiment of the invention to the frequency deviation control flow chart of base band demodulating;

Fig. 6 is the flow chart performed by second embodiment of the invention frequency deviation record update module;

Fig. 7 is the terminal structure schematic diagram according to third embodiment of the invention;

Fig. 8 is the terminal structure schematic diagram according to four embodiment of the invention.

Embodiment

First execution mode of the present invention relates to a kind of adjacent region frequency deviation soft calibration method.Idiographic flow as shown in Figure 3.

Terminal, when starting to carry out nearby region measurement, enters step 301, and terminal carries out FB search.

Then, in step 302, judge that whether FB search is successful, if success, then enter step 303, if unsuccessful, then return step 301 and proceed FB search.Step 301 is same as the prior art with step 302, does not repeat them here.

Then, in step 303, the frequency deviation of the neighbor base station frequency that terminal record obtains according to FB information and this terminal local frequency, and carry out SB search, search for successfully at SB and enter step 304.Certainly, if SB search unsuccessful will from FB search flow process again, same as the prior art, do not repeat them here, emphasis in present embodiment is it is considered that situation when SB searches for successfully.

In step 304, terminal carries out BCCH search, receives the data of BCCH.Certainly, if the data receiver failure of BCCH, then search for unsuccessful situation with SB similar, will from FB search flow process again, the frequency deviation information of original record will not considered as fail message.

Then, in step 305, terminal, according to the frequency deviation recorded in step 303, carries out frequency deviation elimination to the data of the SB information received and BCCH.Make to carry out frequency offset correction in time when adjacent area exists large frequency deviation, ensure normally carrying out, to improve synchronous success rate of subsequent synchronization processes.Specifically, if desired signal is: the frequency deviation of record is Δ f, and the signal so received can be expressed as: wherein, f ₀represent local frequency, n represents the value moment of discrete-time signal, n=0,1,2......, T _srepresent a GSM symbol duration.

Can frequency deviation be eliminated according to following formula, obtain desired signal x (n):

${y\left(n\right)=r\left(n\right)e}^{-j2\mathrm{\π\Δfn}{T}_s}$

$=x\left(n\right)$

Utilize following recursion method to calculate wherein, f _srepresent T _sthe inverse of (a GSM symbol duration).

$e^{-j2\mathrm{\π\Δfn}{T}_s}=e^{-j\frac{2\mathrm{\π}}{f_s}\mathrm{\Δfn}}$

$={[\cos (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})+j\sin (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})]}^n$

$={[\cos (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})+j\sin (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})]}^{n-1}[\cos (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})+j\sin (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})]$

Taylor series expansion according to trigonometric function: $\begin{array}{c}\cos x=1-\frac{x^2}{2}+\frac{x^4}{24}L\\ \sin x=x-\frac{x^3}{6}-\frac{x^5}{120}L\end{array}$ Can obtain (here operand and precision are traded off, only get first two in cos x progression, the Section 1 in sin x progression):

$\cos (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})=1-\frac{{(-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})}^2}{2}$

$\sin (-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf})=-\frac{2\mathrm{\π}}{f_s}\mathrm{\Δf}$

And then can obtain get desired signal x (n) after eliminating frequency deviation.

It is worth mentioning that, be a kind of concrete implementation for eliminating the formula of frequency deviation in this step, in actual applications, also can be out of shape above-mentioned formula or adopt other formula to eliminate frequency deviation, not repeat one by one at this.

Then, within step 306, the data of the SB information after eliminating through frequency deviation and BCCH are carried out base band demodulating.The specific implementation of base band demodulating is same as the prior art, does not repeat them here.

Be not difficult to find, in the present embodiment, by the frequency deviation of the neighbor base station frequency that will obtain when searching for FB before and this terminal local frequency as a reference, frequency deviation elimination carried out to the data of the SB information received and BCCH.Due to the problem that frequency deviation causes too greatly EQ to lose efficacy after effectively prevent reception SB, substantially increase the successful probability of SB demodulation, thus ensure that the success rate of neighbor synchronization.And, owing to being carry out frequency deviation elimination to the data of the SB information received and BCCH, being not that frequency offset correction is carried out to terminal itself, therefore still can ensureing the synchronism of terminal crystal oscillator and Serving cell.

In addition, it should be noted that, terminal can be support the terminal of one of following communication standard or its combination in any: global system for mobile communications GSM, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.That is, present embodiment is not only applicable to GSM, is also applicable to other mobile communication system, as WCDMA, TD-SCDMA etc.

Second execution mode of the present invention relates to a kind of adjacent region frequency deviation soft calibration method.Second execution mode improves on the basis of the first execution mode, and main improvements are:

In second embodiment of the invention, when carrying out base band demodulating, terminal can also estimate the frequency deviation of the frequency deviation of SB information or the data of BCCH.Due to the data of the SB information and BCCH of carrying out base band demodulating be overdeviation eliminate after SB information and the data of BCCH, therefore the frequency deviation of SB information estimated in EQ process or the frequency deviation of the data of BCCH are actually a kind of relative frequency deviation, terminal this relative frequency deviation and the frequency deviation obtained according to FB information to record before are carried out cumulative after, the frequency deviation obtained is preserved as the frequency deviation information of adjacent area, make the adjacent area frequency deviation value preserved truly can reflect current adjacent area frequency deviation, further increase synchronous successfully probability.

Terminal carry out switching or gravity treatment time, according to the frequency deviation information of the adjacent area of this preservation, automatic frequency control (Automatic Frequency Control is called for short " AFC ") calibration can be carried out, to ensure the success rate of terminal gravity treatment or switching.In addition, terminal can also carry out switching or gravity treatment time, the relative adjacent area of frequency deviation information, former community is carried out conversion and preserves, can the success rate normally recovered in former community be improved when gravity treatment or handoff failure.That is, when switching/gravity treatment, crystal oscillator is directly transferred in the frequency of Target cell according to adjacent area frequency deviation estimated value by terminal, and using former community as adjacent area, Target cell, the frequency deviation estimated value of Target cell is converted to former community preserve relative to the frequency deviation of Target cell, so that failure procedures afterwards the correct frequency deviation of rapid adjustment can improve the success rate of failure procedures, or when former community is as finding as early as possible during real Target cell synchronously.

It should be noted that, terminal carry out frequency deviation cumulative before, the frequency deviation of SB information estimated when can also exist adjacent area the or whether frequency deviation of the data of BCCH is credible judges, if carry out the cumulative of frequency deviation again credible, if insincere, the direct frequency deviation obtained according to FB information using record is preserved as the frequency deviation information of adjacent area.By carrying out the judgement of confidence level to the relative frequency deviation estimated, the accuracy of the adjacent area frequency deviation information finally obtained can be ensured.

As shown in Figure 4, in step 401, terminal carries out FB search to the idiographic flow of present embodiment.

Then, in step 402, whether terminal judges FB search is successful, if success, then enters step 403 and 404, if unsuccessful, then return step 401 and proceeds FB search.

In step 403, by the frequency deviation of the neighbor base station frequency that obtains according to FB information and this terminal local frequency, export to frequency deviation record update module, respective handling (as step 404 ') is performed by this frequency deviation record update module, particularly, this frequency deviation record update module records the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to FB information at this moment, temporarily this frequency deviation is preserved as adjacent area frequency deviation.

Search for successfully at FB, also need to enter in step 404, terminal carries out SB search.Search for successfully at SB and enter step 405 and 406.Certainly, if SB search unsuccessful will from FB search flow process again, same as the prior art, do not repeat them here, emphasis in present embodiment is it is considered that situation when SB searches for successfully.

In step 405, terminal carries out BCCH search, receives the data of BCCH.

In step 405 ', in 406,407, according to the neighbor base station frequency obtained by FB information of record and the frequency deviation of this terminal local frequency, frequency deviation elimination is carried out to the data of the SB information received and BCCH, the data of the SB information after eliminating through frequency deviation and BCCH are carried out base band demodulating.

Particularly, the frequency deviation information that can be exported according to frequency deviation record update module by EQ module (base band demodulating module) carries out frequency deviation control, again carries out base band demodulating after carrying out frequency deviation elimination to the data of the SB information received and BCCH.

Because EQ module is utility module, Serving cell, adjacent area, all channels all can use it, and in present embodiment for be the soft alignment of adjacent area frequency deviation, and nearby region measurement receives only can exist SB and BCCH channel, therefore first judge whether it is the reception result of SB or BCCH channel, if, next judge whether it is adjacent area, if adjacent area, so EQ reference input frequency deviation (namely needing the frequency deviation eliminated) just uses the adjacent area frequency deviation value (frequency deviation of namely preserving in frequency deviation record update module) preserved, carry out frequency deviation control, in other situations, EQ reference input frequency deviation is all 0, as shown in Figure 5.

Due in the present embodiment, also needing when carrying out base band demodulating, estimating the frequency deviation of the frequency deviation of SB information or the data of BCCH, the frequency deviation of preserving in frequency deviation record update module is upgraded.Therefore, after step 406,407, also need to enter step 404 ', perform respective handling by frequency deviation record update module.Due to after step 403,406,407, all can step 404 be entered ', therefore below the flow process performed by frequency deviation record update module is specifically described.

As shown in Figure 6, in step 601, frequency deviation record update module judges that whether the frequency deviation result that receives is the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to FB information.If (namely enter into step 404 because of step 403 '), then enter step 602, if not, then enter step 605.

In step 602, judge that whether FB search is successful, if success, enter step 603; If unsuccessful, enter step 608, do not upgrade the frequency deviation of adjacent area.

In step 603, judge whether adjacent area exists, if existed, then enter step 604, using the frequency deviation obtained according to FB information received as adjacent area new frequency deviation preserve.If in step 603, judge that adjacent area does not exist, then enter step 608, do not upgrade adjacent area frequency deviation.That is, for the frequency deviation result of FB, depositing in adjacent area in case, thinking that when finding FB adjacent area frequency deviation value is believable; If do not find FB, then think that this frequency deviation value is incredible.Due in some cases, the frequency deviation calculated may be inaccurate, therefore by increasing some restrictive conditions, can ensure the accuracy of the adjacent area frequency deviation calculated.

If judge that the frequency deviation result received is not the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to FB information in step 601, then in step 605, judge whether the frequency deviation result received is when carrying out base band demodulating, the estimated frequency deviation of SB information or the frequency deviation of the data of BCCH, if the base band demodulating result of SB or BCCH (namely enter into step 404 because of step 406 or 407 '), then enter step 606; If not the base band demodulating result of SB or BCCH, then enter step 608, do not upgrade adjacent area frequency deviation.

In step 606, judge whether adjacent area exists, if existed, then enter step 607, if there is no, then enter step 608.

In step 607, the frequency deviation of SB information estimated when judging that adjacent area exists or the frequency deviation of the data of BCCH whether credible.If credible, then enter step 609, if insincere, then enter step 608.

Specifically, can judge that whether the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH is credible in the following manner:

Soft bit values and preset thresholding are compared, if this soft bit values is greater than preset thresholding, then judges that the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH is credible; If this soft bit values is less than or equal to preset thresholding, then judge that the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH is insincere; Wherein, this soft bit values is the bit value representing received signal quality quality.

That is, deposit in adjacent area in case, when the soft bit values obtained in base band demodulating process meets confidence level thresholding, just think that the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH is believable, otherwise think that this frequency deviation value is incredible.Judged by the confidence level of preset thresholding to frequency deviation, the accuracy of the adjacent area frequency deviation finally obtained can be ensured.

After judgement frequency deviation is credible, enters step 609, carry out the renewal of frequency deviation.Specifically, by before according to the frequency deviation that FB information obtains, add up with the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH, obtain the frequency deviation after adding up.

After step 609, enter step 604, preserve new adjacent area frequency deviation.That is, the frequency deviation after cumulative is preserved as the new frequency deviation information of adjacent area.Mobility due to terminal may make to produce new frequency deviation in the process receiving SB information or BCCH data, and the data of the SB information and BCCH of carrying out base band demodulating be overdeviation eliminate after SB information and the data of BCCH, the frequency deviation of SB information therefore estimated in EQ process or the frequency deviation of the data of BCCH are actually a kind of relative frequency deviation.By the relative frequency deviation of estimation and the frequency deviation originally recorded being added up, upgrading in time, this receives the adjacent area frequency deviation after assessing, and the adjacent area frequency deviation value preserved can be made truly can to reflect current adjacent area frequency deviation, further increases synchronous successfully probability.

It is worth mentioning that, terminal to carry out afterwards switching or gravity treatment time, according to the frequency deviation information of the adjacent area of preserving, AFC calibration can be carried out, to ensure the success rate of terminal gravity treatment or switching.

Experiment proves, adopts the mobile phone of the frequency deviation soft alignment method of present embodiment in the index such as handover success rate and reselection success rate, be all obviously better than the mobile phone of the frequency deviation soft alignment method not adopting present embodiment.It should be noted that, above the step of various method divide, just in order to be described clearly, a step can be merged into when realizing or some step is split, be decomposed into multiple step, as long as comprise identical logical relation, all in the protection range of this patent; To adding inessential amendment in algorithm or in flow process or introducing inessential design, but the core design not changing its algorithm and flow process is all in the protection range of this patent.

Third embodiment of the invention relates to a kind of terminal, as shown in Figure 7, comprises:

FB search module, for when carrying out nearby region measurement, the frequency calibration burst FB information of searching neighboring area.

Frequency deviation logging modle, this frequency deviation logging modle is connected with described FB search module, for when described FB search module is successfully searched the described FB information of adjacent area, records the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to described FB information.

Receiver module, this receiver module is connected with described FB search module, for after described FB search module is successfully searched described FB information, receives the data of synchronization burst SB information and broadcast channel BCCH.Wherein, receiver module is when the data receiver failure of SB information or BCCH, and by the frequency deviation logging modle last time, the frequency deviation of record is labeled as inefficacy, again triggers this FB search module.

Soft alignment module, this soft alignment module is connected with described frequency deviation logging modle and described receiver module, for the described frequency deviation according to described logging modle record, carries out frequency deviation elimination to the data of the described SB information received and BCCH.

Base band demodulating module, this base band demodulating module and described soft alignment model calling, for carrying out base band demodulating by the data of the SB information after described frequency deviation elimination and BCCH.

Terminal in present embodiment supports one of following communication standard or its combination in any: global system for mobile communications GSM, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.

Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.

Four embodiment of the invention relates to a kind of terminal.4th execution mode improves on the 3rd basis of implementing, main improvements are: in four embodiment of the invention, base band demodulating module is also for when carrying out described base band demodulating, estimate the frequency deviation of the frequency deviation of described SB information or the data of described BCCH, and the frequency deviation of SB information of described estimation or the frequency deviation of the data of BCCH are exported to described frequency deviation logging modle.This frequency deviation logging modle is also for adding up the frequency deviation obtained according to FB information of record and the frequency deviation of the estimated frequency deviation of SB information or the data of BCCH.Also comprise in terminal frequency deviation information preserve module, this frequency deviation information preserve module be connected with frequency deviation logging modle, for using add up after frequency deviation preserve as the frequency deviation information of adjacent area, as shown in Figure 8.

It should be noted that, frequency deviation logging modle comprises following submodule:

Credibility judgement submodule, the frequency deviation of SB information estimated during for judging that adjacent area exists or the frequency deviation of the data of BCCH whether credible;

Control submodule, this control submodule is connected with Credibility judgement submodule, for when the result of determination of Credibility judgement submodule is credible, carries out described cumulative; When the result of determination of Credibility judgement submodule is insincere, triggers frequency deviation information and preserve module and directly the frequency deviation obtained according to FB information of record is preserved as the frequency deviation information of adjacent area.

Wherein, Credibility judgement submodule according to the comparative result of soft bit values and preset thresholding, the frequency deviation of SB information estimated when judging that adjacent area exists or the frequency deviation of the data of BCCH whether credible; Described soft bit values is the bit value representing received signal quality quality.

Particularly, Credibility judgement submodule is greater than described preset gate in limited time at described soft bit values, judges that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible; Be less than or equal to described preset gate in limited time at described soft bit values, judge that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is insincere.

In addition, terminal can also comprise: automatic frequency controls calibration module, and this automatic frequency controls calibration module and described frequency deviation information and preserves model calling, for carry out switching or gravity treatment time, according to the frequency deviation information of the described adjacent area of preserving, carry out automatic frequency and control calibration.

Be not difficult to find, present embodiment is the system embodiment corresponding with the second execution mode, and present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.

It is worth mentioning that, each module involved in the present invention the 3rd, the 4th execution mode is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.

The respective embodiments described above realize specific embodiments of the invention, and in actual applications, can do various change in the form and details to it, and without departing from the spirit and scope of the present invention.

Claims (12)

1. an adjacent region frequency deviation soft calibration method, is characterized in that, comprises following steps:

Terminal when carrying out nearby region measurement, if be successfully searched the frequency calibration burst FB information of adjacent area, then the frequency deviation of the neighbor base station frequency that obtains according to described FB information of described terminal record and this terminal local frequency;

Described terminal receives the data of synchronization burst SB information and broadcast channel BCCH, wherein, if the data receiver failure of SB information or BCCH, then the frequency deviation of last record lost efficacy, described terminal re-starts FB information search, and after being successfully searched FB information, again record the frequency deviation of neighbor base station frequency that the FB information that is successfully searched according to this obtains and this terminal local frequency;

According to the described frequency deviation of record, frequency deviation elimination is carried out to the data of the described SB information received and BCCH;

The data of the SB information after described frequency deviation elimination and BCCH are carried out base band demodulating.

2. adjacent region frequency deviation soft calibration method according to claim 1, is characterized in that, also comprise following steps:

When carrying out described base band demodulating, estimate the frequency deviation of the frequency deviation of described SB information or the data of described BCCH;

The frequency deviation obtained according to described FB information of record and the frequency deviation of SB information of described estimation or the frequency deviation of the data of BCCH are added up;

Using the frequency deviation information of the frequency deviation after described adding up as described adjacent area.

3. adjacent region frequency deviation soft calibration method according to claim 2, is characterized in that, after the frequency deviation of the data of the frequency deviation or described BCCH that estimate described SB information, before carrying out described adding up, also comprises following steps:

Whether the frequency deviation of the frequency deviation of the SB information of described estimation when judging that adjacent area exists or the data of described BCCH is credible;

If it is determined that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible, then described terminal performs described cumulative step; If it is determined that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is insincere, then described terminal is directly using the frequency deviation information of the frequency deviation obtained according to described FB information of record as described adjacent area.

4. adjacent region frequency deviation soft calibration method according to claim 3, is characterized in that, judges that whether the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible in the following manner:

Soft bit values and preset thresholding are compared, if described soft bit values is greater than described preset thresholding, then judges that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible; If described soft bit values is less than or equal to described preset thresholding, then judge that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is insincere;

Wherein, described soft bit values is the bit value representing received signal quality quality.

5. adjacent region frequency deviation soft calibration method according to claim 2, is characterized in that, also comprise following steps:

Described terminal carry out switching or gravity treatment time, according to the frequency deviation information of described adjacent area, carry out automatic frequency and control calibration, conversions preservation is carried out in the relative adjacent area of frequency deviation information, Bing Jiangyuan community.

6. adjacent region frequency deviation soft calibration method according to any one of claim 1 to 5, is characterized in that, described terminal supports one of following communication standard or its combination in any:

Global system for mobile communications GSM, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.

7. a terminal, is characterized in that, comprises:

FB search module, for when carrying out nearby region measurement, the frequency calibration burst FB information of searching neighboring area;

Frequency deviation logging modle, this frequency deviation logging modle is connected with described FB search module, for when described FB search module is successfully searched the described FB information of adjacent area, records the frequency deviation of neighbor base station frequency and this terminal local frequency obtained according to described FB information;

Receiver module, this receiver module is connected with described FB search module, for after described FB search module is successfully searched described FB information, receive the data of synchronization burst SB information and broadcast channel BCCH, wherein, the frequency deviation of described frequency deviation logging modle last time record, when the data receiver failure of SB information or BCCH, is labeled as inefficacy, again triggers described FB search module by described receiver module;

Soft alignment module, this soft alignment module is connected with described frequency deviation logging modle and described receiver module, for the described frequency deviation according to described logging modle record, carries out frequency deviation elimination to the data of the described SB information received and BCCH;

Base band demodulating module, this base band demodulating module and described soft alignment model calling, for carrying out base band demodulating by the data of the SB information after described frequency deviation elimination and BCCH.

8. terminal according to claim 7, is characterized in that,

Described base band demodulating module, also for when carrying out described base band demodulating, estimates the frequency deviation of the frequency deviation of described SB information or the data of described BCCH, and the frequency deviation of SB information of described estimation or the frequency deviation of the data of BCCH are exported to described frequency deviation logging modle;

Described frequency deviation logging modle is also for adding up the frequency deviation obtained according to described FB information of record and the frequency deviation of SB information of described estimation or the frequency deviation of the data of BCCH;

Described terminal also comprises frequency deviation information and preserves module, and this frequency deviation information is preserved module and is connected with described frequency deviation logging modle, for the frequency deviation after described adding up being preserved as the frequency deviation information of described adjacent area.

9. terminal according to claim 8, is characterized in that, described frequency deviation logging modle comprises following submodule:

Credibility judgement submodule, whether the frequency deviation of the frequency deviation of the SB information of described estimation during for judging that adjacent area exists or the data of described BCCH is credible;

Control submodule, this control submodule is connected with described Credibility judgement submodule, for when the result of determination of described Credibility judgement submodule is credible, carries out described cumulative; When the result of determination of described Credibility judgement submodule is insincere, triggers described frequency deviation information and preserve module and directly the frequency deviation obtained according to described FB information of record is preserved as the frequency deviation information of described adjacent area.

10. terminal according to claim 9, is characterized in that, described Credibility judgement submodule is according to the comparative result of soft bit values and preset thresholding, and whether the frequency deviation of the frequency deviation of the SB information of described estimation when judging that adjacent area exists or the data of described BCCH is credible; Described soft bit values is the bit value representing received signal quality quality;

Wherein, described Credibility judgement submodule is greater than described preset gate in limited time at described soft bit values, judges that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is credible; Be less than or equal to described preset gate in limited time at described soft bit values, judge that the frequency deviation of the frequency deviation of the SB information of described estimation or the data of described BCCH is insincere.

11. terminals according to claim 8, is characterized in that, also comprise:

Automatic frequency controls calibration module, and this automatic frequency controls calibration module and described frequency deviation information and preserves model calling, for carry out switching or gravity treatment time, according to the frequency deviation information of the described adjacent area of preserving, carry out automatic frequency control and calibrate.

12. terminals according to any one of claim 7 to 11, it is characterized in that, described terminal supports one of following communication standard or its combination in any:

Global system for mobile communications GSM, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.