CN103378965A - Timing error calculating and eliminating method and device of multi-card multi-standby terminal - Google Patents

Abstract

The invention relates to a timing error calculating and eliminating method and device of a multi-card multi-standby terminal. The calculating method includes the following steps: obtaining a frequency control word currently used by the terminal, obtaining a frequency control word of a user recognition module card or a global user recognition module card to be used for receiving data, obtaining the frequency of a resident cell of the user recognition module card or the global user recognition module card to be used for receiving the data, according to the frequency, calculating the frequency error of the user recognition module card or the global user recognition module card in the current cell where the user recognition module card or the global user recognition module card resides, and finally calculating timing error values introduced at time intervals.

Description

The timing offset calculating of Multi-card multi-standby terminal and removing method and device

Technical field

The present invention relates to mobile communication terminal, especially relate to timing offset calculating and removing method and the device of Multi-card multi-standby terminal.

Background technology

At present, outstanding feature of moving communicating field is the various kinds of mobile communication system and deposits that such as GSM, CDMA, WCDMA, CDMA2000, TD-SCDMA, LTE etc., this has brought the variation of mobile communication terminal product.A mobile communication terminal (for example mobile phone) can be operated in a kind of development trend that two even a plurality of identical or different mobile communication system have become terminal.Some mobile communication terminals can access two or more systems in GSM, CDMA, WCDMA, CDMA2000, TD-SCDMA, LTE or the other system usually simultaneously, these mobile communication terminals have two or more SIM (Subscriber Identity Model, subscriber identification module) card or USIM (Universal Subscriber Identity Module, whole world subscriber identification module) card, correspond respectively to two Subscriber Numbers that (or a plurality of) are different, and can allow each subscriber identification module all keep holding state.Such mobile communication terminal is called as Multi-card multi-standby terminal.In the situation of multi-card multi-standby, different SIM or usim card may reside on the different residential quarters, and may can there be different frequency deviations in different residential quarters because of factors such as fast mobile terminal direction, the frequency departures in base station own, therefore the different frequency control word of the corresponding use of different calorie requirements.But terminal is when designing, and for the consideration of cost, general produces different timer clocks with a unified crystal oscillator.Concrete way is, with the current frequency deviation of professional card of carrying out as the Main Basis of control crystal oscillator, other do not carry out professional card, then by the known frequency deviation with carrying out professional card the data that receive are carried out phase rotating, after software is eliminated frequency deviation, carry out channel estimating, and carry out adjustment regularly for the result of channel estimating.The shortcoming of this method is, because deviation regularly exists before receive data, but wait and carry out estimating again timing offset after the channel estimating after receiving data, if timing offset has surpassed the scope that channel estimation method can be corrected, then can cause deviation is appearred in the demodulation of receive data, and and then affect follow-up decode results, cause descending reception mistake.

Summary of the invention

Timing offset calculating and removing method and device that technical problem to be solved by this invention provides a kind of Multi-card multi-standby terminal calculate accordingly to the timing offset that causes because of frequency departure before reception, and eliminate this deviation.

The present invention proposes a kind of timing offset computational methods of Multi-card multi-standby terminal, may further comprise the steps:

Obtain the frequency control word W of the current use of this terminal _AFC

Obtain namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFC

Obtain subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _Cell

Calculate this subscriber identify module card or global subscriber identify module card and reside in frequency departure under the current area:

$\mathrm{\Δf}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\·K_3\·\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe clock frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity;

The timing offset amount that calculating is introduced in time interval T is:

$\mathrm{\Δt}=T\·F{\left(N\right)}_{\mathrm{cell}}\·[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\Δf}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}].$

In one embodiment of this invention, this subscriber identify module card or global subscriber identify module card be meet GSM standard, WCDMA standard, CDMA2000 standard, TDSCDMA standard, LTE standard at least one of them.

The present invention proposes a kind of timing offset removing method of Multi-card multi-standby terminal in addition, may further comprise the steps:

Obtain the frequency control word W of the current use of this terminal _AFC

Obtain namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFC

Obtain subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _Cell

Calculate this subscriber identify module card or global subscriber identify module card and reside in frequency departure under the current area:

$\mathrm{\Δf}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\·K_3\·\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe clock frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity;

The timing offset amount that calculating is introduced in time interval T is:

$\mathrm{\Δt}=T\·F{\left(N\right)}_{\mathrm{cell}}\·[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\Δf}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}];$

Definite time of reception point is T '=T+ Δ t behind acquisition T blanking time.

In one embodiment of this invention, this subscriber identify module card or global subscriber identify module card be meet GSM standard, WCDMA standard, CDMA2000 standard, TDSCDMA standard, LTE standard at least one of them.

The present invention also proposes a kind of timing offset calculation element of Multi-card multi-standby terminal, comprising:

Be used for obtaining the frequency control word W of the current use of this terminal _AFCDevice;

Be used for obtaining namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFCDevice;

Be used for obtaining subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _CellDevice;

Be used for the device that this subscriber identify module card of calculating or global subscriber identify module card reside in the frequency departure under the current area, this frequency departure is:

$\mathrm{\Δf}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\·K_3\·\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity; And

Be used for calculating the device of the timing offset amount of introducing in time interval T, this timing offset amount is:

$\mathrm{\Δt}=T\·F{\left(N\right)}_{\mathrm{cell}}\·[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\Δf}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}].$

The present invention reintroduces a kind of timing offset cancellation element of Multi-card multi-standby terminal, comprising:

Be used for obtaining the frequency control word W of the current use of this terminal _AFCDevice;

Be used for obtaining namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFCDevice;

Be used for obtaining subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _CellDevice;

Be used for the device that this subscriber identify module card of calculating or global subscriber identify module card reside in the frequency departure under the current area, this frequency departure is:

$\mathrm{\Δf}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\·K_3\·\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity;

Be used for calculating the device of the timing offset amount of introducing in time interval T, this timing offset amount is:

$\mathrm{\Δt}=T\·F{\left(N\right)}_{\mathrm{cell}}\·[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\Δf}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}];$ And

For the device of time of reception point definite behind acquisition T blanking time, this time of reception point is T '=T+ Δ t.

The present invention is owing to adopt above technical scheme, make it compared with prior art, has following remarkable advantage: adopt technical scheme of the present invention, can effectively estimate the time point deviation of receive data, thus the intrinsic timing offset problem that the setting of eliminating the crystal oscillator because many cards reside in different districts causes with reference to the frequency of non-this residential quarter.

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 illustrates the schematic diagram of the shared crystal oscillator of a plurality of cards in the Multi-card multi-standby terminal.

Fig. 2 illustrates Multi-card multi-standby terminal and is in two example context in the residential quarter.

Fig. 3 illustrates according to an embodiment of the invention frequency control word selection schematic diagram.

Fig. 4 illustrates according to an embodiment of the invention timing offset computational methods flow chart.

Fig. 5 illustrates according to an embodiment of the invention timing offset removing method flow chart.

Fig. 6 illustrates according to an embodiment of the invention calculating K ₃Schematic diagram.

Embodiment

The following examples of the present invention will be described in the method that the timing offset of Multi-card multi-standby terminal in the mobile communication terminal of multi-card multi-standby calculates and eliminates.This method can be calculated accordingly to the timing offset that is caused by frequency departure, so just can guarantee that the time point that receives is correct, thereby avoids because deviation surpasses the patient scope of algorithm, causes the risk of hydraulic performance decline etc.

For content of the present invention is understood better, before describing illustrative methods of the present invention, first with reference to Fig. 1 illustrate frequency deviation and the time inclined to one side generation.

Fig. 1 illustrates the schematic diagram of the shared crystal oscillator of a plurality of cards in the Multi-card multi-standby terminal.Mobile communication terminal uses a voltage-controlled compensation crystal oscillator 10 usually, produces regularly by this crystal oscillator 10.The output frequency of crystal oscillator 10 is generally 26MHz.Take the TD-SCDMA pattern as example, the output frequency that crystal oscillator 10 produces generates 10.24MHz clock f through base band phase locked loop (PLL) 21,22 _TTo different SIM card or usim card A and card B, clock is designated as respectively f (A) _TAnd f (B) _TThe timer of baseband chip is based on this clock count, and count value is 0～10239, and the cycle is 10240, when the value of the value of comparator (such as comparator 21a, 22a) and timer (such as timer 2 1b, 22b) equates, produces frame timing information.

Terminal is being carried out in the mutual process with the residential quarter, can come frequency departure and timing offset between computing terminal and the residential quarter according to data descending in the current persistent district, and the frequency departure that calculates is frequency deviation.The adjustment of frequency deviation is by the setpoint frequency control word, thus the control voltage V of change crystal oscillator 10 _CtrlRevise clock, thereby guarantee up transmission frequency and the descending receive frequency f of terminal _cAccurately, K wherein ₁And K ₂Be Clock Multiplier Factor.To different SIM card or usim card A and card B, up transmission frequency is designated as respectively f (A) _cAnd f (B) _c, Clock Multiplier Factor is designated as respectively K (A) ₁, K (A) ₂, K (B) ₁And K (B) ₂Inclined to one side when the timing offset that calculates is, by adjusting the position that regularly occurs, namely revise the value of comparator and revise regularly local.In this case when adjusting frequency deviation, although guaranteed up transmission frequency f _cAccurately, but clock f _TAlso can change, this has just introduced when extra inclined to one side.

Here take TD-SCDMA as example, suppose that frequency deviation is Δ f, by changing the control voltage V of crystal oscillator 10 _CtrlEliminate this frequency deviation, corresponding output frequency change amount is Δ f _Osc=f _OscΔ f/f _c, the variation delta f of corresponding clock fT _TBe f _TΔ f/f _c, then introduce in the time interval T the time partially be:

$T\·f_T\·(\frac{1}{f_T+\mathrm{\Δ}{f}_T}-\frac{1}{f_T})---\left(1\right)$

In Multi-card multi-standby terminal, owing to many cards may reside on the different residential quarters, so for terminal, must select a residential quarter as benchmark.In order to guarantee the accuracy of up transmission, usually can select to carry out the residential quarter at professional card place as the reference benchmark.In this time, the frequency adjustment of other cards just can not be embodied in the adjustment of crystal oscillator 10.This just must preserve the deviation of the frequency of other cards by the mode of record, carries out software and eliminate frequency deviation after receiving data.And when the residential quarter of other cards begins to carry out business, just the frequency of this residential quarter is adjusted crystal oscillator 10 as the reference benchmark.

The deviation of frequency also can cause deviation regularly in addition on the one hand.For example, for the residential quarter of a carrier wave 2GHz, if frequency departure is 1KHz, under the prerequisite of not adjusting frequency, the timing offset that per second produces will be (1KHz/2GHz) s so.In the LTE system, the maximum translational speed of supporting is 500Km/h.For the carrier frequency of 2GHz, this approximately produces the Doppler frequency shift of 1KHz.Because many cards reside in different residential quarters in the terminal, different districts may be in different position, terminal front and back.In moving process, if take one of them residential quarter as reference, for the another one residential quarter, frequency deviation is with double.That is to say that if translational speed reaches 500Km/h, so maximum frequency deviation will reach about 2KHz, the timing offset that per second produces will reach more than the 1us.For gsm system, when maximum paging cycle was 9 51 multi-frames, the timing offset of generation was 2.118us, is about 2Qbit, so this deviation problem for gsm system is little.But for LTE system, TDSCDMA system, when maximum paging cycle was 2.56s, the timing offset that produces was 2.56us (78.6Ts that is equivalent to the LTE system, the 3.28chips of TD-SCDMA system).This can produce some problems to LTE system and TD-SCDMA system.Especially the LTE system can really cause comprising intersymbol interference in the receive data because of bad timing, thereby affect the performance of descending reception.And for the TD-SCDMA system, the tap number that adopts depending on its algorithm and photographic fixing rings, if tap number surpasses 8, then impact can be eliminated by algorithm, if tap number less than 8, then can't be eliminated the effects of the act.

Although more than just lifted timing offset under three kinds of access technologies of GSM/TDSCDMA/LTE impact, but because CDMA2000 and WCDMA have the technical characterictic of time-division, so no matter be which kind of access technology among the CDMA2000/WCDMA/GSM/TDSCDMA/LTE, the impact of inclined to one side factor in the time of more or less all can being subject to frequency and being forbidden to cause.

The embodiment that the following describes will provide a kind of the incipient stage (for example signal receive before) just with frequency deviation and the time inclined to one side elimination method.

The situation of double-card dual-standby is discussed for simplicity.Fig. 2 illustrates Multi-card multi-standby terminal and is in two example context in the residential quarter.Suppose existing two card A and B, reside in respectively on residential quarter 1 and the residential quarter 2, as shown in Figure 2, this moment terminal with speed v near residential quarter 1, away from residential quarter 2, the frequency of residential quarter 1 is f1, the frequency of residential quarter 2 is f2, supposes for residential quarter 1, and the Doppler frequency shift of this moment is Δ f, because residential quarter 1 and residential quarter 2 are in opposite position in the terminal direction of advance, so the Doppler frequency shift of residential quarter 2 is

The Doppler frequency shift that calculates this moment is the result who calculates for benchmark accurately in the frequency of terminal.Now because card A needs and business is carried out in residential quarter 1, then the crystal oscillator 10 of terminal need to be adjusted to the situation synchronous with residential quarter 1 this time, the frequency deviation f when eliminating up transmission with this, after the adjustment, then the frequency departure of terminal and residential quarter 2 becomes:

$-\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HDA0000157205180000021.png,HDA0000157205180000061.png"\; state="\{\{state\}\}">f</figure-callout>}2\&times;\frac{2\mathrm{\&Delta;f}}{f1+\mathrm{\&Delta;f}},$

Frequency deviation before this is equivalent to is larger.And the computational methods of the timing offset that frequency deviation causes are:

$\mathrm{\&Delta;t}=T\&times;f_T\&times;(\frac{1}{f_T+{\mathrm{\&Delta;f}}_T}-\frac{1}{f_T}),---\left(2\right)$

Δ f wherein _TBe frequency deviation, f _TBe carrier frequency, T is the interval, and the Δ t that obtains is under the frequency deviation effect that continues the T time, the timing offset that causes.Can find out that from formula (2) under fixed frequency, frequency deviation is larger, the time is longer, and the timing offset amount that causes is larger.

Can know by top derivation, if know residential quarter that current card is resident and the frequency departure of benchmark residential quarter, then can be according to current frequency deviation f _T, carrier frequency f _TWith next time of reception point and current interval T, extrapolating to receive next time needs the timing amount Δ t that adjusts.Can be with artificial the eliminating of known timing offset by the method, thus after avoiding receiving data, find that timing offset has surpassed the patient scope of algorithm, cause data to recover, descending reception is impacted.

Fig. 3 illustrates according to an embodiment of the invention frequency control word selection schematic diagram.With reference to shown in Figure 3, comprise crystal oscillator 31, a plurality of SIM card or usim card 32 (for example blocking A, card B, card C) and memory cell 33 in the terminal.Stored the frequency control word of corresponding each SIM card or usim card 32 in the memory cell 33, for example block frequency control word A corresponding to A, frequency control word B that card B is corresponding ... frequency control word N corresponding to card N.In addition, current frequency control word that definitely comes into force of memory cell 33 storages.When a certain calorie requirement carried out up transmission, terminal can change the current frequency control word that comes into force of memory cell 33 internal reservoir into frequency control word corresponding to this card.

Because frequency deviation is a relative value, frequency control word is an absolute value, so frequency deviation Δ f _TThe carrier frequency f of difference that can be by frequency control word and the Serving cell at current card place _TObtain.Because:

$\mathrm{\&Delta;t}=T\&CenterDot;f_T\&CenterDot;(\frac{1}{f_T+{\mathrm{\&Delta;f}}_T}-\frac{1}{f_T}),$

Can find out, timing offset Δ t is the impact that is subjected to crystal oscillator 10 in essence, and frequency control word also is directly to affect crystal oscillator 10, thus just can release timing offset Δ t by difference and the time interval T of frequency control word, irrelevant with current carrier frequency.

At this, suppose the crystal oscillator output frequency f that LSB of the every change of frequency control word (Least Significant Bit, least significant bit) is corresponding _OscThe change amount be K ₃If know the difference of frequency control word, also just can obtain the timing offset when radio-frequency receiving-transmitting can be obtained behind the convergent-divergent in proportion to the low precision of clock.Change amount K ₃Can draw in advance and be kept in the memory of terminal by production test.

Fig. 4 illustrates according to an embodiment of the invention method flow diagram.This method is carried out in mobile communication terminal.With reference to shown in Figure 4, method may further comprise the steps:

In step 401, obtain the frequency control word W of the current use of terminal _AFC

In step 402, obtain namely will receive data the frequency control word W (N) that uses of card N _AFC

In step 403, obtain namely the frequency F (N) of card N persistent district that will receive data _Cell(unit: MHz);

In step 404, computer card N resides in the frequency departure under the current area:

$\mathrm{\&Delta;f}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\&CenterDot;K_3\&CenterDot;\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscBe crystal oscillator output frequency (unit: MHz),

F _OscTo F (N) _CellClock Multiplier Factor, K ₃The output frequency f corresponding to a LSB of every change frequency control word _OscChange amount (unit: Hz), can obtain in advance by production test.

In step 405, the timing offset amount that calculating is introduced in time interval T is:

$\mathrm{\&Delta;t}=T\&CenterDot;F{\left(N\right)}_{\mathrm{cell}}\&CenterDot;[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\&Delta;f}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}].$

Obtained thus accurately timing offset amount.

In one embodiment, can calculate above-mentioned change amount K by following step ₃, its schematic diagram can be with reference to shown in Figure 6.

Known f _OscTo F (N) _CellClock Multiplier Factor PLL _RF, artificially specify the frequency f of a transmission _RF1, this frequency must be f _Osc(26MHz) multiply by Clock Multiplier Factor PLL _RFAdjust control voltage when monitoring the actual frequency of exporting with instrument, when the frequency f that reaches appointment _RF1The time, record control magnitude of voltage V _Ctrl1Corresponding AFC control word W _AFC1

Changing the AFC control word is W _AFC2, corresponding control voltage is V _Ctrl2, with the frequency f of the actual output of monitored meter _RF2, can obtain so the corresponding f of LSB of every change frequency control word _OscVariable quantity K ₃For

$\frac{1}{{\mathrm{PLL}}_{\mathrm{RF}}}\&CenterDot;\frac{f_{\mathrm{RF}2}-f_{\mathrm{RF}1}}{W_{\mathrm{AFC}2}-W_{\mathrm{AFC}1}}.$

Fig. 5 illustrates according to an embodiment of the invention timing offset removing method flow chart.This method is carried out in mobile communication terminal.Step 501-505 among Fig. 5 is identical with step 401-405 among Fig. 4, but the extra step that Fig. 5 increases:

Step 506, definite time of reception point is T '=T+ Δ t behind acquisition T blanking time.

Like this, for the reception event of script behind time interval T, by being modified as time T ' rear accuracy that receives timing with assurance that receives.

The method of above-described embodiment can be carried out in the digital processing unit in mobile communication.

Summarize described, embodiments of the invention can effectively be estimated the time point deviation of receive data, thereby the setting of eliminating the crystal oscillator because a plurality of SIM or usim card reside in different districts has guaranteed the performance of subsequent treatment with reference to the intrinsic timing offset problem that the frequency of non-this residential quarter causes.

Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims (6)

1. the timing offset computational methods of a Multi-card multi-standby terminal may further comprise the steps:

Obtain the frequency control word W of the current use of this terminal _AFC

Obtain namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFC

Obtain subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _Cell

Calculate this subscriber identify module card or global subscriber identify module card and reside in frequency departure under the current area:

$\mathrm{\&Delta;f}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\&CenterDot;K_3\&CenterDot;\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity; And

The timing offset amount that calculating is introduced in time interval T is:

$\mathrm{\&Delta;t}=T\&CenterDot;F{\left(N\right)}_{\mathrm{cell}}\&CenterDot;[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\&Delta;f}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}].$

2. the method for claim 1 is characterized in that, this subscriber identify module card or global subscriber identify module card be meet GSM standard, CDMA2000 standard, WCDMA standard, TD-SCDMA standard, LTE standard at least one of them.

3. the timing offset removing method of a Multi-card multi-standby terminal may further comprise the steps:

Obtain the frequency control word W of the current use of this terminal _AFC

Obtain namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFC

Obtain subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _Cell

Calculate this subscriber identify module card or global subscriber identify module card and reside in frequency departure under the current area:

$\mathrm{\&Delta;f}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\&CenterDot;K_3\&CenterDot;\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity;

The timing offset amount that calculating is introduced in time interval T is:

$\mathrm{\&Delta;t}=T\&CenterDot;F{\left(N\right)}_{\mathrm{cell}}\&CenterDot;[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\&Delta;f}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}];$ And

Definite time of reception point is T '=T+ Δ t behind acquisition T blanking time.

4. method as claimed in claim 3 is characterized in that, this subscriber identify module card or global subscriber identify module card be meet GSM standard, CDMA2000 standard, WCDMA standard, TD-SCDMA standard, LTE standard at least one of them.

5. the timing offset calculation element of a Multi-card multi-standby terminal comprises:

Be used for obtaining the frequency control word W of the current use of this terminal _AFCDevice;

Be used for obtaining namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFCDevice;

Be used for obtaining subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _CellDevice;

Be used for the device that this subscriber identify module card of calculating or global subscriber identify module card reside in the frequency departure under the current area, this frequency departure is:

$\mathrm{\&Delta;f}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\&CenterDot;K_3\&CenterDot;\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity; And

Be used for calculating the device of the timing offset amount of introducing in time interval T, this timing offset amount is:

$\mathrm{\&Delta;t}=T\&CenterDot;F{\left(N\right)}_{\mathrm{cell}}\&CenterDot;[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\&Delta;f}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}].$

6. the timing offset cancellation element of a Multi-card multi-standby terminal comprises:

Be used for obtaining the frequency control word W of the current use of this terminal _AFCDevice;

Be used for obtaining namely subscriber identify module card that will receive data or the frequency control word W (N) that global subscriber identify module card uses _AFCDevice;

Be used for obtaining subscriber identify module card that this namely will receive data or the frequency F (N) of global subscriber identify module card persistent district _CellDevice;

Be used for the device that this subscriber identify module card of calculating or global subscriber identify module card reside in the frequency departure under the current area, this frequency departure is:

$\mathrm{\&Delta;f}\left(N\right)=[W{\left(N\right)}_{\mathrm{AFC}}-W_{\mathrm{AFC}}]\&CenterDot;K_3\&CenterDot;\frac{F{\left(N\right)}_{\mathrm{cell}}}{f_{\mathrm{osc}}},$

F wherein _OscThe output frequency of the crystal oscillator of this terminal, K ₃The corresponding f of a least significant bit of every this frequency control word of change _OscVariable quantity;

Be used for calculating the device of the timing offset amount of introducing in time interval T, this timing offset amount is:

$\mathrm{\&Delta;t}=T\&CenterDot;F{\left(N\right)}_{\mathrm{cell}}\&CenterDot;[\frac{1}{F{\left(N\right)}_{\mathrm{cell}}+\mathrm{\&Delta;f}\left(N\right)}-\frac{1}{F{\left(N\right)}_{\mathrm{cell}}}];$ And

For the device of time of reception point definite behind acquisition T blanking time, this time of reception point is T '=T+ Δ t.

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