CN102045082A - Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal - Google Patents
Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal Download PDFInfo
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Abstract
The invention relates to the field of communication, and discloses a control method of a dual-standby terminal and AFC (automatic frequency control) loops of the dual-standby terminal. In the invention, two AFC loops share a crystal oscillator, frequency deviation estimation obtained by two AFC loops respectively is processed through a selection control module, a final AFC control word for controlling the shared crystal oscillator is obtained, and the dual-standby terminal for controlling two AFC loops by a single crystal oscillator is realized. Because in the practical use, a corresponding link circuit by two numbers used by the dual-standby terminal, an endured temperature, a channel environment and the movement speed of the terminal are nearly identical, Through sharing one crystal oscillator, not only can be the implementation cost of the dual-standby terminal reduced effectively, but also the automatic frequency correction performance of the AFC loop is hardly not influenced.
Description
Technical field
The present invention relates to the communications field, particularly the double-standby terminal in the communications field.
Background technology
Under the common driving of technology, market and wireless mobile applied business, the wireless mobile communications industry development is rapid, and mobile communication product has become the necessary article of people's routine work, life.Along with mobile communication is increasing to the influence of people's life, the phenomenon of two terminals of an individual demand is more and more.For example some need the crowd of frequent two places work; for avoiding expensive roaming in other places expense; usually can respectively have subscriber identification module (Subscriber ldentity Module is called for short " the SIM ") card on anticipatory remark ground in two places, use different SIM card in different cities.But frequent replacing SIM card or to carry two terminals all be the thing that bothers very much, the dual-card dual-standby terminal of a machine even numbers arises at the historic moment.
Terminal technology about Multi-Subscriber Number can be the U.S. Patent application of " US20060234693 " referring to the patent No..In this patent application, disclosed a kind of terminal of supporting jack per station respectively, have 2 sim card slots, share digital signal processor (Digital Signal Processor, be called for short " DSP ") and application processor, connect 2 radio frequencies (Radio Frequency is called for short " RF ") module by a commutation circuit.This terminal also is in the stage of supporting two numbers respectively, can not satisfy the requirement of the two standbies of even numbers.
Satisfy the double-standby terminal of the two standby requirements of even numbers, on standard and product, have two classes, category-A and category-B.Usually, the category-A terminal is called as two bilateral terminals, category-B terminal treated and is called as two single-pass terminals for the treatment of.On function, both identical points are, during standby, and standby when can both support two numbers, as being in Idle state simultaneously, two numbers can both be paged.The two Terminal Type main distinctions are that the support of category-A terminal ought be called out by a number, or in the communication process, the another one number can be paged, and can converse when user's selection is answered; And the category-B terminal is when number during paged or conversation, and the another one number can't paging receiving or conversed.So though A, B two Terminal Types support the standby of two numbers, the category-A terminal can be supported two talking link, the category-B terminal can only be supported a talking link.
Existing two bilateral terminal for the treatment of all is to adopt two cover chips usually, for example Chinese patent application number a kind ofly can make two subscriber cards be in the technical scheme of holding state simultaneously for having proposed in the patent of invention of CN200610157647.0: this dual-card dual-standby terminal comprises main frame and slave, the master machine antenna that this main frame has the main frame draw-in groove and connects in turn, main frame radio-frequency module and main frame baseband processing module, this slave has the slave draw-in groove, this slave also has the slave antenna that connects in turn, slave radio-frequency module and slave baseband processing module, this main frame baseband processing module and slave baseband processing module communicate by communication module.As seen main frame and slave use the baseband processor of oneself to finish the work the implementation of a kind of category-A double-standby terminal as shown in Figure 1 separately alone.The mobile phone of this double-card dual-standby all is to be made of two cover hardware, be equivalent to two mobile phones are done together, promptly two overlap communication devices, but share a cover LCD (Liquid Crystal Display, abbreviation " LCD "), keyboard, loudspeaker, battery, so cost is than higher, power consumption is higher simultaneously.
China's patent application number is that 200810033228.5 patent of invention has also proposed a kind of double card double standby mobile phone (being a kind of implementation of above-mentioned category-B terminal) that adopts single baseband processing chip to realize, as shown in Figure 2, two SIM card shared baseband process chip, shared RF radio-frequency module.This scheme has reduced power consumption and cost.
In realization, shared RF radio-frequency module can cause when No. one phone is in conversation, and other No. one telephone service can only interrupt, and can't receive another road signal, and at this moment another number can't be paged or be answered and call.Therefore, a kind of dual-card dual-standby terminal of a cover baseband processing chip two cover RF modules that adopts is suggested, as shown in Figure 3.It realizes communication by two cover RF modules, and when making No. one phone in conversation, other No. one phone still can communicate business.
No matter be above-mentioned category-A terminal, or the category-B terminal, automatic frequency control (AutomaticFrequency Control is called for short " AFC ") module all is one of them important part.Because variations in temperature, the output frequency of crystal oscillator has deviation, and traditional terminal all needs to use the AFC technology to correct the output frequency of crystal oscillator.Fig. 4 shows prior art, the implementation of using AFC independently to control for each standby numbers.Aerial signal amplifies through RF (radio frequency) amplifier, is input to frequency mixer.The signal of frequency mixer is input to analog to digital converter (Analog DigitalConverter is called for short " ADC "), carries out the conversion of analog signal to digital signal.The signal of ADC is input to demodulation module on the one hand, is input to protocol stack again and handles.Protocol stack links to each other with SIM card, the user profile in the treatment S I M card.The signal of ADC also is input to frequency deviation estimating modules simultaneously, the shift state of estimated frequency, and output to filter to obtain the comparatively stable estimation of frequency shift (FS), i.e. control word.Filter is converted to digital signal with frequency signal, and the result is outputed to digital to analog converter (DAC), and crystal oscillator is controlled, to reach the purpose that frequency is adjusted.The signal of crystal oscillator is input to frequency mixer through phase-locked loop, so that the signal that receives is carried out the frequency deviation adjustment.
Yet the present inventor finds that there is following problem in present implementation:
1.AFC for two numbers is independent control.And in actual the use, two number respective links, the temperature that is stood, channel circumstance, and the translational speed of terminal almost are identical.Therefore, use two each and every one crystal oscillators to control two AFC loops respectively, and then control the frequency adjustment of two numbers, the realization cost of terminal has been caused unnecessary waste.
2. the working condition of two of two standbies numbers may be different, and one of possibility is in the talking state another one and is in holding state, and perhaps two all are in conversation or holding state.Therefore adjustment when being in speed that the AFC of the link of talking state adjusts usually above holding state may obtain to adjust more accurately effect.In addition, if the operating state of two numbers is close, the channel circumstance of two number respective links also can comprehensively be handled so, thereby makes the AFC loop obtain more information, to improve the performance of AFC link.Therefore, by the existing implementation of using AFC independently to control to each standby numbers, also fail to make the performance of automatic frequency correction to reach best.
Summary of the invention
The object of the present invention is to provide the control method of the automatic frequency control loop of a kind of double-standby terminal and double-standby terminal, when the automatic frequency correction performance of AFC loop not being impacted, effectively reduce the cost of double-standby terminal.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of double-standby terminal, comprise two radio-frequency modules, and double-standby terminal also comprises two automatic frequency control AFC loops, corresponding with a radio-frequency module respectively, and two AFC loops are shared a crystal oscillator;
Double-standby terminal also comprises the selection control module, is used for the frequency offset estimating that two AFC loops obtain is separately handled, and obtains the final AFC control word that the crystal oscillator of sharing is controlled of being used for.
Embodiments of the present invention also provide a kind of control method of automatic frequency control loop of double-standby terminal, comprise following steps:
Separately frequency offset estimating in two automatic frequencies control AFC loops that double-standby terminal obtains in this double-standby terminal to be comprised;
Double-standby terminal is handled the frequency offset estimating that obtains separately in two AFC loops, obtains final AFC control word;
Double-standby terminal is controlled the crystal oscillator that two AFC loops are shared according to final AFC control word.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Two AFC loops are shared a crystal oscillator, by selecting control module the frequency offset estimating that obtains separately in two AFC loops is handled, obtain the final AFC control word that the crystal oscillator of sharing is controlled of being used for, realize double-standby terminal by two AFC loops of single crystal oscillator control.Because in actual use, two number institute respective links, the temperature that stands, channel circumstance that double-standby terminal uses, and the translational speed of terminal, almost be identical, therefore by sharing same crystal oscillator, not only can effectively reduce the realization cost of double-standby terminal, and can the automatic frequency correction performance of AFC loop be impacted hardly.And simplicity of design is easy to realize.
Further, two AFC loops are shared a DAC, because the effect of DAC is the AFC control word is carried out digital-to-analogue conversion, the analog signal after the conversion are outputed to crystal oscillator.Therefore two AFC loops in the double-standby terminal can be shared a DAC fully, thereby further reduce cost.
Further,, the frequency offset estimating that obtains separately in described two AFC loops is handled, obtained described final AFC control word, can improve the performance of automatic frequency correction according to the work state information of two numbers of described double-standby terminal
Further, when a number under conversation or data connection status, the AFC control word of then selecting this number correspondence is as unified AFC control word, and the crystal oscillator of sharing is controlled.The pairing link of the number of talking state or data connection status sends, the reception data are more owing to be in, and this machine also can generate heat.Therefore, double-standby terminal can be followed the tracks of fast according to the link circuit condition of this number, that is to say, adjustment when being in speed that the AFC of the link of talking state adjusts usually above holding state, therefore will be in the AFC control word of the pairing frequency offset estimating of number of conversation or data connection status, as final AFC control word, can obtain to adjust more accurately effect.
Further, if two numbers are in conversation or data connection status simultaneously, perhaps two numbers are in idle condition simultaneously, and then the control word with these two AFC loops averages calculating, export unified AFC control word afterwards, crystal oscillator is controlled.Because under the close situation of the operating state of two numbers, it is consistent substantially that the frequency deviation of these two numbers changes, so the frequency deviation of can joining together to adjust, make the AFC loop can obtain more information, thereby improve the automatic frequency correction performance of AFC loop.
Further, double-standby terminal is provided with SIM interface and/or USIM interface, can make this double-standby terminal can support various communication standards, as GSM, CDMA, WCDMA, TD-SCDMA or the like.
Description of drawings
Fig. 1 is the structural representation of category-A dual-card dual-standby terminal of the prior art;
Fig. 2 is the structural representation of the dual-card dual-standby terminal of single-baseband processing chip list RF module of the prior art;
Fig. 3 is the structural representation of the dual-card dual-standby terminal of the two RF modules of single-baseband processing chip of the prior art;
Fig. 4 is the double-standby terminal structural representation that the AFC loop of two independent crystal oscillators of the prior art is realized;
Fig. 5 is the structural representation according to the double-standby terminal of first embodiment of the invention;
Fig. 6 is the control method flow chart according to the AFC loop of the double-standby terminal of second embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First embodiment of the invention relates to a kind of double-standby terminal, as shown in Figure 5.This double-standby terminal comprises two radio-frequency modules (being RF transceiver 1, the RF transceiver 2 among Fig. 5), two automatic frequency control AFC loops (being the loop that is made of frequency mixer, ADC, frequency offset estimating, filter, selection control module, DAC, crystal oscillator, phase-locked loop among Fig. 5).Two AFC loops are corresponding with a radio-frequency module respectively, and two AFC loops are shared a crystal oscillator.Each radio-frequency module, AFC loop and corresponding demodulation module, protocol stack module are respectively applied for the communication process of a number.
Wherein, select control module to be used for the frequency offset estimating that two AFC loops obtain is separately handled, obtain the final AFC control word that the crystal oscillator of sharing is controlled of being used for.
Specifically, in two AFC loops, the AFC control word of loop 1 and loop 2 frequency offset estimating separately through obtaining behind the filter outputs to same selection control module.This selection control module links to each other with two protocol stack modules simultaneously, obtains the work state information of two numbers.Select the work state information of control module, the frequency offset estimating that comes from two loops is judged with comprehensive, calculate unified AFC control word, through crystal oscillator of D/A control of one according to two numbers.Crystal oscillator is output signal to two an AFC loop phase-locked loop separately again.
In the present embodiment, select the work state information of control module, the frequency offset estimating that obtains separately in two AFC loops is handled, obtain final AFC control word, to improve the performance of automatic frequency correction according to two numbers of double-standby terminal.
Such as, if a number of double-standby terminal is in conversation or data connection status, another number is in holding state, then selects control module will be in the AFC control word of the conversation or the pairing frequency offset estimating of number of data connection status, as final AFC control word.That is to say, when a number under conversation or data connection status, the AFC control word of then selecting this number correspondence is as unified AFC control word, and the crystal oscillator of sharing is controlled.The pairing link of the number of talking state or data connection status sends, the reception data are more owing to be in, and this machine also can generate heat.Therefore, double-standby terminal can be followed the tracks of fast according to the link circuit condition of this number, adjustment when promptly being in speed that the AFC of the link of talking state adjusts usually above holding state, therefore will be in the AFC control word of the pairing frequency offset estimating of number of conversation or data connection status, as final AFC control word, can obtain to adjust more accurately effect.
Perhaps, if two numbers of double-standby terminal all are in conversation or data connection status, perhaps all be in holding state, then select the control word of control module with the frequency offset estimating that obtains separately in two AFC loops, average calculating, with the result of average computation,, crystal oscillator is controlled as final AFC control word.Because under the close situation of the operating state of two numbers, it is consistent substantially that the frequency deviation of these two numbers changes, so the frequency deviation of can joining together to adjust, make the AFC loop can obtain more information, thereby improve the automatic frequency correction performance of AFC loop.
In addition, be appreciated that in actual applications, also can handle the frequency offset estimating that obtains separately in two AFC loops, as the AFC control word of selecting at random to obtain in the AFC loop, as final AFC control word etc. by other modes.
Be not difficult to find, in the present embodiment, two AFC loops are shared a crystal oscillator, by selecting control module the frequency offset estimating that obtains separately in two AFC loops is handled, obtain the final AFC control word that the crystal oscillator of sharing is controlled of being used for, realize double-standby terminal by two AFC loops of single crystal oscillator control.Because in actual use, two number institute respective links, the temperature that stands, channel circumstance that double-standby terminal uses, and the translational speed of terminal, almost be identical, therefore by sharing same crystal oscillator, not only can effectively reduce the service of enjoying two different operators simultaneously, the realization cost that perhaps has the double-standby terminal of two telephone numbers in strange land, and can the automatic frequency correction performance of AFC loop be impacted (or even having improved the performance of automatic frequency correction) hardly, and, simplicity of design is easy to realize.
Need to prove, be to realize twoly waiting to communicate by letter in the present embodiment by baseband processing chip, two AFC loops are shared a digital to analog converter DAC, by the DAC that shares final AFC control word is carried out digital-to-analogue conversion, analog signal after the conversion is outputed to shared crystal oscillator, further to reduce cost.But be appreciated that, in the present embodiment, be twoly to wait to communicate by letter realizing by baseband processing chip, it is that example describes that two AFC loops are shared a digital to analog converter DAC, in actual applications, also can realize twoly waiting to communicate by letter by two baseband processing chips, each self-contained DAC of each AFC loop, select control module to select a DAC, final AFC control word is exported to selected DAC, by this selecteed DAC final AFC control word is carried out digital-to-analogue conversion, and the analog signal after will changing outputs to shared crystal oscillator.
In addition, what deserves to be mentioned is, in double-standby terminal shown in Figure 5, what be provided with is two subscriber identification module SIM interfaces, but in actual applications, can also have various other to change example, as the double-standby terminal setting be that two users serve identification module USIM interface, or a SIM interface and a USIM interface etc.Satisfied the user greatly and used the strange land even numbers, enjoy the demand of two different operators services simultaneously, and the double-standby terminal volume in the present embodiment has been littler, cost is lower, carries more convenient.
Because double-standby terminal is provided with SIM interface and/or USIM interface, therefore can make this double-standby terminal can support various communication standards, as GSM, CDMA, WCDMA, TD-SCDMA or the like.
Need to prove, each unit of mentioning in the equipment execution mode of the present invention all is a logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each the equipment execution mode of the present invention will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.
Second embodiment of the invention relates to a kind of control method of automatic frequency control loop of double-standby terminal, and idiographic flow as shown in Figure 6.
In step 610, separately frequency offset estimating in two automatic frequencies control AFC loops that double-standby terminal obtains in this double-standby terminal to be comprised.
Then, in step 620, this double-standby terminal obtains final AFC control word according to the frequency offset estimating that obtains separately in two AFC loops.Specifically, this double-standby terminal is handled the frequency offset estimating that obtains separately in two AFC loops according to the work state information of two numbers, obtains final AFC control word.Such as, if a number of double-standby terminal is in conversation or data connection status, another number is in holding state, then will be in the AFC control word of the pairing frequency offset estimating of number of conversation or data connection status, as final AFC control word.
If two numbers of double-standby terminal all are in conversation or data connection status, perhaps all be in holding state, then, average calculating the control word of the frequency offset estimating that obtains separately in two AFC loops, with the result of average computation, as final AFC control word.
Then, in step 630, this double-standby terminal is after obtaining final AFC control word, and the AFC control word that this is final is carried out digital-to-analogue conversion by the digital to analog converter DAC that shares.
Then, in step 640, the analog signal after this double-standby terminal is changed according to the DAC through sharing is controlled the crystal oscillator that two AFC loops are shared.
What deserves to be mentioned is that in the present embodiment, the network system of double-standby terminal support is one of following or its combination in any:
Global system for mobile communications GSM, code division multiple access CDMA, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.
Be not difficult to find that first execution mode is and the corresponding equipment execution mode of present embodiment, present embodiment can with the enforcement of working in coordination of first execution mode.The correlation technique details of mentioning in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in first execution mode.
Method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium or the like).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. a double-standby terminal comprises two radio-frequency modules, it is characterized in that,
Described double-standby terminal also comprises two automatic frequency control AFC loops, and corresponding with a described radio-frequency module, and described respectively two AFC loops are shared a crystal oscillator;
Described double-standby terminal also comprises the selection control module, is used for the frequency offset estimating that described two AFC loops obtain is separately handled, and obtains the final AFC control word that described shared crystal oscillator is controlled of being used for.
2. double-standby terminal according to claim 1 is characterized in that, described two AFC loops are shared a digital to analog converter DAC;
Described shared DAC is used for described final AFC control word is carried out digital-to-analogue conversion, and the analog signal after the conversion is outputed to described shared crystal oscillator.
3. double-standby terminal according to claim 1, it is characterized in that, described selection control module is handled the frequency offset estimating that obtains separately in described two AFC loops according to the work state information of two numbers of described double-standby terminal, obtains described final AFC control word.
4. double-standby terminal according to claim 3, it is characterized in that, if a number of described double-standby terminal is in conversation or data connection status, another number is in holding state, then described selection control module is with the described AFC control word that is in the pairing frequency offset estimating of number of conversation or data connection status, as described final AFC control word.
5. double-standby terminal according to claim 3, it is characterized in that, if two numbers of described double-standby terminal all are in conversation or data connection status, perhaps all be in holding state, then described selection control module is with the control word of the frequency offset estimating that obtains separately in described two AFC loops, average calculating, with the result of average computation, as described final AFC control word.
6. according to each described double-standby terminal in the claim 1 to 5, it is characterized in that described double-standby terminal is provided with subscriber identification module SIM interface and/or the user serves identification module USIM interface.
7. the control method of the automatic frequency control loop of a double-standby terminal is characterized in that, comprises following steps:
Separately frequency offset estimating in two automatic frequencies control AFC loops that described double-standby terminal obtains in this double-standby terminal to be comprised;
Described double-standby terminal is handled the frequency offset estimating that obtains separately in described two AFC loops, obtains final AFC control word;
Described double-standby terminal is controlled the crystal oscillator that described two AFC loops are shared according to described final AFC control word.
8. the control method of the automatic frequency control loop of double-standby terminal according to claim 7 is characterized in that, also comprises following steps:
Described double-standby terminal is after obtaining described final AFC control word, and the AFC control word that this is final is carried out digital-to-analogue conversion by the digital to analog converter DAC that shares;
In the final AFC control word of described basis, in the step that the crystal oscillator that described two AFC loops are shared is controlled, described shared crystal oscillator is controlled according to the analog signal after the described conversion.
9. the control method of the automatic frequency control loop of double-standby terminal according to claim 7, it is characterized in that, in the step that the described frequency offset estimating that obtains separately in to described two AFC loops is handled, work state information according to two numbers of described double-standby terminal, the frequency offset estimating that obtains separately in described two AFC loops is handled, obtained described final AFC control word.
10. the control method of the automatic frequency control loop of double-standby terminal according to claim 9, it is characterized in that, in the following manner according to the work state information of two numbers of described double-standby terminal, the frequency offset estimating that obtains separately in described two AFC loops is handled, is obtained described final AFC control word:
If a number of described double-standby terminal is in conversation or data connection status, another number is in holding state, then with the described AFC control word that is in the pairing frequency offset estimating of number of conversation or data connection status, as described final AFC control word;
If two numbers of described double-standby terminal all are in conversation or data connection status, perhaps all be in holding state, then, average calculating the control word of the frequency offset estimating that obtains separately in described two AFC loops, with the result of average computation, as described final AFC control word.
11. the control method of the automatic frequency control loop of double-standby terminal according to claim 7 is characterized in that, the network system of described double-standby terminal support is one of following or its combination in any:
Global system for mobile communications GSM, code division multiple access CDMA, Wideband Code Division Multiple Access (WCDMA) WCDMA, TD SDMA TD-SCDMA.
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