CN1909386A - Device and method for realizing frequency switch and automatic control of multiple-module mobile communication terminal - Google Patents
Device and method for realizing frequency switch and automatic control of multiple-module mobile communication terminal Download PDFInfo
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- CN1909386A CN1909386A CNA2005100285384A CN200510028538A CN1909386A CN 1909386 A CN1909386 A CN 1909386A CN A2005100285384 A CNA2005100285384 A CN A2005100285384A CN 200510028538 A CN200510028538 A CN 200510028538A CN 1909386 A CN1909386 A CN 1909386A
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Abstract
The invention relates to a device for realizing multi-mode mobile communication terminal frequency switch and automatic control, and a relative method, wherein each mode sending/receiving module of multi-mode mobile terminal shares one crystal vibrator to save cost and energy consumption, to allow the terminal to use automatic frequency lock ring at each mode, to effectively keep the carrier wave synchronous of communication chain. And the invention comprises: a multi-mode automatic frequency control word refresher, a voltage-control crystal vibrator and a digit/analogue converter; the refresher is used to select and calculate the frequency control word of target mode; the digit/analogue converter based on said control word generates control voltage via digit signal; said vibrator based on the control voltage generates reference frequency signal; and the invention also provides a multi-mode automatic frequency control word refreshing module to replace the multi-mode automatic frequency control word refreshing device.
Description
Technical field
The present invention relates to support frequency switching and control method for frequency and the device of the mobile terminal device of multi-mode communication system to a plurality of patterns base station.
Background technology
At moving communicating field, the 3G (Third Generation) Moblie technology is because the advance of its technology will replace second generation mobile communication technology.GSM is global digital mobile communication system, belongs to second generation mobile communication system standard.WCDMA is a Wideband CDMA Technology, is one of three big standards of 3-G (Generation Three mobile communication system) standard.
In the technology innovation stage,, support the mobile communication terminal device of two or more patterns to arise at the historic moment for avoiding risk and considering that the popularity rate of second generation communication equipment and coverage rate are higher.Typical known multi mode terminal comprises the bimodule mobile communication terminal of supporting GSM and two kinds of patterns of WCDMA.As shown in Figure 1, it is present dual-mode terminal covers intersection at WCDMA and GSM a work schematic diagram, this terminal both can receive and handle the wireless signal that the GSM base station sends, also can receive and handle the wireless signal that the WCDMA base station sends, therefore it both can be operated in the overlay area of GSM, also can be operated in the overlay area of WCDMA, can also select best base station to be used for service in their intersection overlay area.
In wireless communication system, when adopting synchronous demodulation or coherent detection, receiving terminal need provide one with the coherent carrier of transmitting terminal modulated carrier with the frequency homophase.Obtaining of this coherent carrier just is called carrier synchronization.The carrier synchronization inaccuracy can cause communication quality to descend until communication failure, thereby carrier synchronization is a key technology in the wireless communication system.Portable terminal uses AFC (automatic frequency control) device that carrier wave frequency deviation (abbreviation of frequency shift (FS)) is carried out Continuous Tracking usually, and input voltage according to frequency deviation size real-time regulated VCXO, with the compensating frequency skew, improve the levels of precision of carrier synchronization.As shown in Figure 2, it is the automatic frequency locked loop structured flowchart of present dual-mode terminal, this dual-mode terminal uses fully independently carrier synchronization loop, be unfavorable for reducing the cost of terminal equipment, when under the first pattern active state the second pattern base station being measured, the frequency control loop initial set value of second pattern is difficult to determine.Cause the inaccurate of the second pattern base station signal measurement result under the bigger situation of frequency deviation, frequency control loop can not be gone into lock for a long time when more likely causing terminal from first mode switch to second pattern, causes professional interruption.
Summary of the invention
Technical problem to be solved by this invention provides the device and method that a kind of multimode mobile communication terminal realizes that frequency is switched and controlled automatically, it can realize that the shared same crystal oscillator of each pattern transmission/receiver module of multi-module mobile terminal is to save cost and power consumption, and allow multi-module mobile terminal under different mode, to use the automatic frequency locked loop of each self mode, so that keep the carrier synchronization of each mode communication link most effectively.
In order to solve above technical problem, the invention provides the device that a kind of multimode mobile communication terminal realizes that frequency is switched and controlled automatically, it comprises multimode automatic frequency control word updating device, VCXO and digiverter, described multimode automatic frequency control word updating device is used to select and calculates frequency control word under the target pattern, described digiverter is finished by digital signal according to described frequency control word and is produced control voltage, and described VCXO produces reference frequency signal according to described control voltage.
Described multimode automatic frequency control word updating device comprises control module, data management module, accumulator, with two strobe units, described control module selects effective Frequency offset estimation value to give described accumulator by strobe unit of signal SEL control, by the automatic frequency control word of described another strobe unit selection of signal LOAD control from described data management module or described accumulator, described data management module is used to store cell information, the tabulation and with the corresponding automatic frequency control word in sub-district, and the cell information that sends according to described control module finds corresponding automatic frequency control word from cell information, and described accumulator is used to finish each cycle and adds up with the Frequency offset estimation value and upgrade the automatic frequency control word.
When mode switch or alien frequencies switching state, the initial value of the automatic frequency control word under the described target pattern has following formula to obtain, the initial value f of automatic frequency control word
K+1=f
k+ λ * (f-f
k); Wherein f is automatic frequency control word, the f of the Target cell of storage
kBe the automatic frequency control word of current area, λ is the weight regulatory factor, value [0,1].
In addition, the present invention also provides a kind of frequency of multimode mobile communication terminal that realizes to switch and automatic frequency control method, at first frequency control word under the target pattern is selected and calculated to multimode automatic frequency control word update module, digiverter is finished by digital signal according to described frequency control word and is produced control voltage then, produces reference frequency signal by VCXO according to described control voltage at last.
The realization of described multimode automatic frequency control word update module may further comprise the steps: 1): begin refresh routine in the frequency control word update cycle temporarily, carry out next step; 2): judge whether that occurrence frequency switches or multi-mode is switched, as the execution in step 5 that switches, as do not switch and carry out next step; 3): from a plurality of frequency deviation estimating modules, select an effectively frequency offseting value Δ f of output according to the work at present pattern, carry out next step; 4): by the accumulator automatic frequency control word value f of new target cell more
K+1, wherein the accumulator formula is f
K+1=f
k-Δ f, f
kBe the frequency control word value of current area, execution in step 9 then; 5): judge whether current area has been recorded in the database, be new sub-district as record not, execution in step 8 as record, then for measuring the sub-district, is carried out next step; 6): the initial value of reading this sub-district automatic frequency control word from database is f, carries out next step; 7): by accumulator new target cell automatic frequency control word value f more
K+1, accumulator formula f wherein
K+1=f
k+ λ * (f-f
k), f
kBe the frequency control word value of current area, λ is the weight regulatory factor, value [0,1], and execution in step 9 then; 8): new database content more, add Target cell, with the frequency control word value f that current accumulator was contained
kAs the initial value of automatic frequency control word, get back to wait state then, if the frequency control word update cycle arrives, then repeating step 1; 9): with described f
K+1Output in the digiverter; 10): use described f
K+1As the former save value in the up-to-date automatic frequency control word value replacement data storehouse of current area, get back to wait state then, if the frequency control word update cycle arrives, then repeating step 1.
Because the present invention allows the shared same VCXO of each pattern transmission/receiver module of multi-module mobile terminal to save cost and power consumption, and allow multi-module mobile terminal under different mode, to use the automatic frequency locked loop of each self mode, so that keep the carrier synchronization of each mode communication link most effectively.Adopt the automatic frequency control word of optimizing (being designated hereinafter simply as " AFC control word ") to preserve, be written into and update control apparatus or module, reach and when two kinds of patterns or frequency switching, accelerate the frequency deviation convergence process.Particularly adopt formula: the initial value f of automatic frequency control word
K+1=f
k+ λ * (f-f
k), calculate AFC control word initial value, accelerated the convergence rate of automatic frequency control, improved the reliability of second mode frequency control initial setting, make carrier synchronization fast and accurately.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
Fig. 1 is present multimode terminal covers intersection at two kinds of Modular Communications Systems a working condition;
Fig. 2 has the frequency switching of existing multimode terminal and the dual-mode terminal automatic frequency locked loop block diagram of automatic frequency control apparatus;
Fig. 3 is the dual-mode terminal automatic frequency locked loop block diagram with apparatus of the present invention;
Fig. 4 is a multimode automatic frequency control word updating device block diagram of the present invention;
Fig. 5 is the block diagram that the present invention is applied to WCDMA and GSM dual mode signal;
Fig. 6 is the flow chart of multimode automatic frequency control word update module of the present invention.
Embodiment
Fig. 3 is the dual-mode terminal automatic frequency locked loop block diagram with apparatus of the present invention.The automatic frequency locked loop of each pattern of mobile communication terminal includes base band signal process, Frequency offset estimation, RF/IF processor, A/D (modulus) conversion equipment, PLL (phase-locked loop), and the frequency of each mode common multimode terminal of the present invention is switched and automatic frequency control apparatus.The frequency of multimode terminal of the present invention is switched and automatic frequency control apparatus comprises multimode automatic frequency control word updating device 383, VCXO (VCXO) 382 and digiverter 385.Multimode automatic frequency control word updating device 383 is used to select the estimated value of Frequency offset estimation and calculates AFC control word under the target pattern, digiverter 385 is finished by digital signal according to the AFC control word and is produced control voltage, VCXO 382 produces reference frequency signal according to control voltage, and reference frequency signal sent to PLL, PLL is locked in the carrier frequency that is used for modulation and described carrier frequency is sent to the RF/IF processor, the RF/IF processor will be from the carrier frequency demodulation of the radiofrequency signal of multiplexer, restituted signal is converted to the baseband signal processor of sending into each self mode after the digital signal by A/D converter, and baseband signal processor extracts the frequency deviation estimation device that the digital signal sequences that can be used for frequency offset estimating is exported to each self mode from baseband signal.
Fig. 4 is a block diagram of the present invention, wherein multimode automatic frequency control word updating device 383 comprises control module 406, data management module 405, accumulator, with two strobe units 412,413, control module 406 selects effective Frequency offset estimation value to give described accumulator by signal SEL control strobe unit 413, by the AFC control word of signal LOAD control strobe unit 412 selections from described data management module 405 or described accumulator, data management module 405 is used to store cell information, the tabulation and with the corresponding AFC control word in sub-district, and the cell information that sends according to control module 406 finds corresponding AFC control word from cell information, and accumulator is used to finish each cycle and adds up with the Frequency offset estimation value and upgrade the automatic frequency control word.Wherein accumulator is made of register 407, time-delay 408 and adder 409.
Wherein the AFC control word is upgraded and to be divided into three parts and to realize 1) module that the AFC control word is periodically updated that adopts negative feedback mode mainly to constitute by accumulator; 2) data management module 405, and it manages all cell lists of having measured, and preserve the AFC control word of each sub-district, and the initial value that the AFC control word is provided.3) control module 406, and it selects the accumulator of exporting to of correct frequency deviation estimation device by strobe unit 413 according to the work at present pattern; Control module 406 is by shared data notification data administration module 405 current area information; Control module 406 provides AFC control word initial value by Load Signal notification data administration module 405 when mode of operation switching or alien frequencies switching and notice is written into accumulator with initial value, and wherein alien frequencies switches the switching of the sub-district that refers to the common mode different frequency.AFC control word method for updating is worked in the following manner in data management module:
In the proper communication stage: accumulator added the frequency offset estimating value in the register 407 in each cycle.And 405 each cycle of data management module are read the AFC control word, upgrade the AFC control word of this sub-district with this AFC control word.When new sub-district is measured, add the element of cell list;
When mode switch or alien frequencies switching state: at first portable terminal is done suitably to set to obtain the desired destination carrier frequency to the synthetic PLL of target pattern radio frequency; Secondly data management module 405 is read the AFC control word f of Target cell and the AFC control word f of current area
k, calculate the AFC control word initial value that is used to switch the back Target cell with following formula
The initial value f of AFC control word
K+1=f
k+ λ * (f-f
k)
(formula 1)
Wherein λ is a weight regulatory factor value [0,1].Its value is according to f
kPrecision relativity decision with f.As accurate more to the Frequency Estimation of pattern 2 Target cells, then the value of λ should be more near 1; If instead the Frequency Estimation to pattern 2 Target cells is got over inaccuracy, then show the AFC control word convergency value that more believe pattern 1 cell-of-origin, so the value of λ should approach 0 more.Register in the AFC control word write accumulator of being calculated by formula 1 is as the initial value of accumulator.
Frequency offset estimating (389,383) is used to calculate the signal of frequency deviation, is generally pilot frequency sequence or training sequence etc.It makes difference to its sequence, and the estimation to current frequency shift (FS) is finished in the impartial computing of tabling look-up and make even.It is by cycle output frequency offset estimating value, and the cycle is determined by algorithm characteristic.
Below in conjunction with Fig. 4,5 the present invention is described further.Fig. 5 is the block diagram that the present invention is applied to WCDMA and GSM mode mobile terminal.In Fig. 5, pattern one is the WCDMA pattern, and its RF architecture is a beat receiver; Pattern two is the GSM pattern, and its RF architecture is direct down-conversion formula receiver.Antenna 301 is used to receive the radiofrequency signal of WCDMA, received signal is carried out signal through duplexer 302 backs by LNA (low noise amplifier) 303 and is amplified, signal after the amplification is by RFBPF (RF filter) 304, enter then by multiplier 311,321 and IF handle the demodulating equipment that base band preliminary treatment 312 is formed, the required carrier signal of demodulation is provided by PLL 331, and the analog baseband signal after the demodulation is transformed to digital baseband signal through A/D converter 313,323 and gives WCDMA digital baseband signal processing module 340 processing.Antenna 351 is used to receive the radiofrequency signal of GSM, received signal is carried out signal through duplexer 352 backs by LNA353 and is amplified, signal after the amplification passes through RFBPF354, enter the demodulating equipment of forming by multiplier 361,371 and LPF (low pass filter) 364,362 then, the required carrier signal of demodulation is provided by PLL 381, and the analog baseband signal after the demodulation is transformed to digital baseband signal through A/D (modulus) converter 363,373 and gives GSM digital baseband signal processing module 384 processing.The Serial No. that the digital baseband processing module 340,384 of two patterns will be used for current frequency offset estimating sends to frequency deviation estimating modules 393,389.Frequency deviation estimating modules 393,389 is according to the frequency shift (FS) of input data computation current period, and frequency deviation value is exported to multimode AFC control word updating device 383.Multimode AFC control word updating device 383 is exported to digiverter 385 in calculating with after upgrading the AFC control word with the AFC control word, digiverter receiving digital signals output aanalogvoltage is used to control VCXO 382, and the reference frequency signal of the output of VCXO is used to control the carrier lock of PLL 381 or 331.Because the frequency of synchronization VCXO 382 can only be controlled by the frequency control loop of a pattern, so 393,389 need of synchronization frequency deviation estimating modules have one to be in active state.The processing of multimode AFC control word updating device 383 is (among the figure be example with the bimodulus) as shown in Figure 4, and the reference frequency that its control VCXO 382 produces makes PLL331,381 be locked in the carrier frequency of expectation.This carrier wave is used for signal demodulating equipment separately.
In Fig. 4, two frequency deviation estimating modules 393,389 are respectively applied for the frequency shift (FS) of estimation model one and pattern two, the current Frequency offset estimation value of they periodic outputs has only an estimated value effective at synchronization, and control module 406 selects effective value to send into accumulator by the SEL signal.
In Fig. 4,3 signals of control module 406 outputs: signal SEL is used to select current frequency offset estimating value, and signal SEL changes with working mode of mobile terminal (pattern one or pattern two) switching.Signal LOAD indication accumulator initial value is set, when alien frequencies switching or mode switch take place when, in first frequency offset estimating cycle, signal LOAD indication is written into the AFC control word that data management module 405 provides, and is written into adder 409 operation results in other LOAD indications constantly.Signal " cell information " is given data management module with the current area information sharing.
In Fig. 4, data management module 405 is used to manage the AFC control word of each sub-district of having measured, safeguard a cell list and corresponding AFC control word in this module, when LOAD signal indication accumulator initial value is set, data management module is found its AFC control word according to cell information from tabulation, revise back output through formula 1 again, output AFC accumulator currency when tabulation does not comprise current area.Do not upgrade the accumulator initial value when signal LOAD indicates, data management module reads the AFC control word from the register 407 of accumulator, and upgrades tabulation according to cell information, when measured sub-district is not in tabulation, adds the cell list element.
In Fig. 4, the strobe unit 412 of alternative is by signal LOAD control, and the strobe unit 413 of alternative is controlled by signal SEL.
In Fig. 4, register 407, time-delay 408 and adder 409 constitute accumulators and are used to finish each cycle and add up with the frequency offset estimating value and upgrade the AFC control word.
Analog to digital conversion device 385 is finished the function that is produced control voltage by digital signal.
Two PLL devices 381,331 are respectively pattern one and pattern two produces the carrier signal that is used for modulation.
Mobile terminal switching process is as follows: supposition is at moment A point, and portable terminal has been finished the measurement to base station 2, has at this moment drawn the AFC control word f of base station 2, and f is saved as the AFC control word of base station 2 by data management module.This control word represent portable terminal in A operational environment constantly (translational speed, working temperature etc.) to the carrier track result of base station 2.And after this, portable terminal is positioned at the coverage of base station 1 always, and promptly base station 1 is the serving BS of portable terminal.Suppose that portable terminal receives that at time B point network instruction carries out from the base station 12 the switching to the base station, the AFC control word is f before switching
k, it is saved as the AFC control word of base station 1 equally by data management module.This control word represent portable terminal in B operational environment constantly (translational speed, working temperature etc.) to the carrier track result of base station 1.At this moment change action takes place, and portable terminal 1 switches to base station 2 from the base station.Calculate the AFC control word initial value that uses this moment by formula 1.
Multimode mobile communication terminal frequency of the present invention switches with the method for controlling automatically and the multimode mobile communication terminal frequency is switched and the difference of the device of automatic control just is, replaced multimode automatic frequency control word updating device 383 with multimode automatic frequency control word update module 3830, other parts are all identical.Fig. 6 is the flow chart of multimode automatic frequency control word update module 3830 of the present invention, this flow process hypothesis portable terminal supports various modes to receive, each pattern all has frequency shift (FS) (being called for short " frequency deviation ") estimation module separately, and frequency deviation estimating modules all is periodically to export the frequency deviation value of its current period.It may further comprise the steps: the first step, at first begin after module 501 is unlocked, then system has just entered wait offset frequency cycle estimator module 502, it is in wait state when FREQUENCY CONTROL does not arrive word cycle, carrying out the judgement of FREQUENCY CONTROL cycle arriving is carried out by cycle arriving judge module 503, begin refresh routine when being judged as the frequency control word update cycle temporarily, carry out next step;
Second step entered switching judging module 504, and it judges whether that mainly occurrence frequency switches or multimodal switching, as the execution in step five that switches, as did not switch and carry out next step;
The 3rd step entered frequency deviation and selects module 505, and it mainly selects an effectively output according to the work at present pattern from a plurality of frequency deviation estimating modules, and output frequency offset value delta f, carries out next step then;
The 4th step entered AFC control word update module 506, and it mainly carries out the accumulator value of upgrading the AFC control word, by the accumulator automatic frequency control word value f of new target cell more
K+1, wherein the accumulator formula is f
K+1=f
k-Δ f, wherein f
kBe the frequency control word value of current area, execution in step nine then;
The 5th step entered new sub-district judge module 509, and it is new sub-district mainly in order to judging whether current area has been recorded in the database as not writing down, and execution in step eight as record, then for measuring the sub-district, is carried out next step;
The 6th step entered and extracts AFC control word module 510, and it mainly is that to read this sub-district AFC control word from database be f, carries out next step;
The 7th step entered the computing module 511 of AFC control word initial value, and it mainly is by accumulator new target cell automatic frequency control word value f more
K+1, accumulator formula f wherein
K+1=f
k+ λ (f-f
k), λ is the weight regulatory factor, value [0,1], and the value of λ is according to described f, f
kPrecision relativity decision, execution in step nine then
The 8th step entered database and adds update module 512, and it is mainly used in more new database content, adds Target cell, with the frequency control word value f that current accumulator was contained
kAs the initial value of AFC control word, get back to wait state then, wait for the arriving of frequency control word update cycle;
The 9th step entered output AFC control word module 507, and it is mainly with f
K+1Output to digital to analog conversion apparatus (385) and be used to change the control voltage of VCXO (382), and carry out next step simultaneously;
The tenth step entered and upgrades AFC control word database module 508, and it mainly uses f
K+1As the former save value in the up-to-date AFC control word replacement data storehouse of current area, get back to wait state then, wait for the arriving of frequency control word update cycle.
Claims (9)
1, a kind of device of realizing that the multimode mobile communication terminal frequency is switched and automatic frequency is controlled, it is characterized in that, it comprises multimode automatic frequency control word updating device (383), VCXO (382) and digiverter (385), described multimode automatic frequency control word updating device (383) is used to select and calculates automatic frequency control word under the target pattern, described digiverter (385) is finished by digital signal according to described frequency control word and is produced control voltage, and described VCXO (382) produces reference frequency signal according to described control voltage.
2, the device that the frequency of multimode mobile communication terminal as claimed in claim 1 is switched and automatic frequency is controlled, it is characterized in that, described multimode automatic frequency control word updating device (383) comprises control module (406), data management module (405), accumulator, with two strobe units (412,413), described control module (406) selects effective Frequency offset estimation value to give described accumulator by signal (SEL) control strobe unit (413), control the automatic frequency control word of described strobe unit (412) selection by signal (LOAD) from described data management module (405) or described accumulator, described data management module (405) is used to store cell information, the tabulation and with the corresponding automatic frequency control word in sub-district, and the cell information that sends according to described control module (406) finds corresponding automatic frequency control word from cell information, and described accumulator is used to finish each cycle and adds up with the Frequency offset estimation value and upgrade the automatic frequency control word.
3, the device that the frequency of multimode mobile communication terminal as claimed in claim 1 or 2 is switched and automatic frequency is controlled, it is characterized in that, when mode switch or alien frequencies switching state, the initial value of the automatic frequency control word under the described target pattern has following formula to obtain, the initial value f of automatic frequency control word
K+1=f
k+ λ * (f-f
k); Wherein f is automatic frequency control word, the f of the Target cell of storage
kBe the automatic frequency control word of current area, λ is the weight regulatory factor, value [0,1].
4, the device that the frequency of multimode mobile communication terminal as claimed in claim 3 is switched and automatic frequency is controlled is characterized in that the value of described λ is according to f
kPrecision relativity decision with f.
5, the device that the frequency of multimode mobile communication terminal as claimed in claim 2 is switched and automatic frequency is controlled is characterized in that, described signal (SEL) switches according to terminal work mode and changes.
6, the device that the frequency of multimode mobile communication terminal as claimed in claim 2 is switched and automatic frequency is controlled is characterized in that, described accumulator is made of register (407), time-delay (408) and adder (409).
7, a kind of frequency of multimode mobile communication terminal that realizes is switched and automatic frequency control method, it is characterized in that, at first frequency control word under the target pattern is selected and calculated to multimode automatic frequency control word update module (3830), digiverter (385) is finished by digital signal according to described frequency control word and is produced control voltage then, produces reference frequency signal by VCXO (382) according to described control voltage at last.
8, the frequency of realization multimode mobile communication terminal as claimed in claim 7 is switched and automatic frequency control method, it is characterized in that the realization of described multimode automatic frequency control word update module (3830) may further comprise the steps:
1): begin refresh routine in the frequency control word update cycle temporarily, carry out next step;
2): judge whether that occurrence frequency switches or multi-mode is switched, as the execution in step 5 that switches, as do not switch and carry out next step;
3): from a plurality of frequency deviation estimating modules, select an effectively frequency offseting value Δ f of output according to the work at present pattern, carry out next step;
4): by the accumulator automatic frequency control word value f of new target cell more
K+1, wherein the accumulator formula is f
K+1=f
k-Δ f, f
kBe the frequency control word value of current area, execution in step 9 then;
5): judge whether current area has been recorded in the database, be new sub-district as record not, execution in step 8 as record, then for measuring the sub-district, is carried out next step;
6): the initial value of reading this sub-district automatic frequency control word from database is f, carries out next step;
7): by accumulator new target cell automatic frequency control word value f more
K+1, accumulator formula f wherein
K+1=f
k+ λ * (f-f
k), f
kBe the frequency control word value of current area, λ is the weight regulatory factor, value [0,1], and execution in step 9 then;
8): new database content more, add Target cell, with the frequency control word value f that current accumulator was contained
kAs the initial value of automatic frequency control word, get back to wait state then, if the frequency control word update cycle arrives, then repeating step 1;
9): with described f
K+1Output in the digiverter (385);
10): use described f
K+1As the former save value in the up-to-date automatic frequency control word value replacement data storehouse of current area, get back to wait state then, if the frequency control word update cycle arrives, then repeating step 1.
9, the device that the frequency of multimode mobile communication terminal as claimed in claim 8 is switched and automatic frequency is controlled is characterized in that the value of the described λ of step 7 is according to described f, f
kPrecision relativity decision.
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| WO2015095986A1 (en) * | 2013-12-24 | 2015-07-02 | Intel IP Corporation | System and method for frequency control loop in mobile device with plurality of sims |
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| CN106332125A (en) * | 2015-06-30 | 2017-01-11 | 展讯通信（上海）有限公司 | Terminal mode switching method and terminal |
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