CN104936263A - Method and device for reducing cell search time and wireless device - Google Patents
Method and device for reducing cell search time and wireless device Download PDFInfo
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- CN104936263A CN104936263A CN201510035595.9A CN201510035595A CN104936263A CN 104936263 A CN104936263 A CN 104936263A CN 201510035595 A CN201510035595 A CN 201510035595A CN 104936263 A CN104936263 A CN 104936263A
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Abstract
The invention provides a method for reducing cell search time in a wireless device. The method comprises the steps of updating a pre-established temperature and working frequency mapping table based on an event trigger period or a preset period; obtaining temperature information; determining the frequency for executing the cell search according to the obtained temperature information and the temperature and working efficiency mapping table; and performing cell search according to the determined frequency. The invention also provides the device for performing the method and the wireless device.
Description
the cross reference of related application
This application claims the U.S. Provisional Patent Application No.61/968 submitted on March 20th, 2014, the rights and interests of 129, its whole disclosure is incorporated in this by reference.
Technical field
This specification relates to the Cell searching of wireless device, relates more specifically to the method and apparatus for shortening cell search time and wireless device.
Background technology
The mobile phone market dog-eat-dog in the current whole world, reduce the important competitive method that product price is also cell phone manufacturer always, therefore, Ge great cell phone manufacturer is also more and more strict to cost control.For this reason, for the crystal oscillator (abbreviation crystal oscillator) as mobile phone key components, more cheap device is also constantly being found by all big enterprises.
Early stage at mobile phone market, all big enterprises mostly adopt temperature-compensating/voltage compensated crystal oscillator (TCVCXO) as clock source.TCVCXO possess skills maturation, stable performance, vary with temperature the frequency deviation shake advantage such as little caused, be therefore widely adopted.But in order to reduce product price, manufacturer wishes the alternative crystal oscillator that can search out cheaper urgently.Relative to TCVCXO, digital compensation crystal oscillator (DCXO) lacks temperature-compensation circuit, and it is larger that this causes it to vary with temperature frequency deviation jitter range; But on the other hand, DCXO cost is lower.Further, the shortcoming that DCXO varies with temperature the increase of frequency deviation jitter range can be evaded by software approach, and thus, it receives the favor of all big enterprises.
Summary of the invention
An object of various embodiment of the present invention is to solve shakes relevant problem to above-mentioned frequency deviation.
According to a first aspect of the invention, The embodiment provides a kind of in a wireless device for shortening the method for cell search time, described method comprises: trigger based on event or upgrade the temperature and operating frequency mapping table set up in advance based on the predetermined cycle; Obtain temperature information; The frequency performing Cell searching is determined based on obtained temperature information and described temperature and operating frequency mapping table; And perform Cell searching according to the described frequency determined.
According to one embodiment of present invention, the method comprises further: shut down at described wireless device or be saved in nonvolatile memory by described temperature and operating frequency mapping table when being in idle condition, and when described wireless device start, read described temperature and operating frequency mapping table from described nonvolatile memory.
According to another embodiment of the invention, the method comprises further: perform frequency calibration; Frequency after record calibration and calibration temperature; And set up temperature and operating frequency mapping table in advance according to the frequency after described calibration, described calibration temperature and corresponding relation given between temperature and frequency deviation.
According to still another embodiment of the invention, wherein, trigger based on event or upgrade described temperature based on the predetermined cycle and comprise with operating frequency mapping table: recording frequency and corresponding temperature that successful execution Cell searching uses, and based on the described record described temperature of renewal and operating frequency mapping table; Or when predetermined r expires, obtain temperature information and corresponding frequency, and upgrade described temperature and operating frequency mapping table based on obtained temperature information and corresponding frequency; Or when the frequency difference between the new frequency corresponding to same temperature value and old frequency is greater than predetermined frequency difference threshold value, upgrade described temperature and operating frequency mapping table based on described new frequency.
In one embodiment of the invention, successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously.
In another embodiment of the present invention, the value of described predetermined timer depends on the operating state of described Wireless Telecom Equipment, and described operating state comprises idle condition and single user state.
In yet another embodiment of the present invention, the frequency determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table comprises: the respective frequencies of the temperature information obtained in described temperature and operating frequency mapping table; And the frequency obtained respective frequencies is defined as performing Cell searching.
According to some embodiments of the present invention, the method comprises further: if utilize the determined frequency for performing Cell searching to fail execution Cell searching, then the determined frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And utilize described new frequency again to perform described Cell searching.
According to another embodiment of the present invention, the frequency wherein determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table comprises: if the frequency corresponding in described temperature and operating frequency mapping table of the temperature information obtained is from without renewal, or the time that the temperature information obtained frequency distance corresponding in described temperature and operating frequency mapping table upgraded last time exceedes scheduled time threshold value, then determine based on the frequency corresponding in described temperature and operating frequency mapping table of obtained temperature information and predetermined frequency offset the frequency range performing Cell searching.
According to a second aspect of the invention, The embodiment provides a kind of in a wireless device for shortening the device of cell search time, described device comprises: updating block, is arranged to based on event triggering or upgrades the temperature and operating frequency mapping table set up in advance based on the predetermined cycle; Temperature acquiring unit, is arranged to acquisition temperature information; Frequency determinative elements, is arranged to the frequency determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table; And search unit, the described frequency be arranged to according to determining performs Cell searching.
According to one embodiment of present invention, this device comprises further: storage unit, when being arranged in described wireless device shutdown or being in idle condition, described temperature and operating frequency mapping table are saved in nonvolatile memory, and reading unit, be arranged to when described wireless device start, read described temperature and operating frequency mapping table from described nonvolatile memory.
According to another embodiment of the invention, this device comprises further: alignment unit, is arranged to execution frequency calibration; Record cell, is arranged to the frequency after record calibration and calibration temperature; And initialization unit, be arranged to the frequency after according to described calibration, described calibration temperature and corresponding relation given between temperature and frequency deviation and set up temperature and operating frequency mapping table in advance.
According to still another embodiment of the invention, updating block in this device is arranged to: the temperature of the frequency that record successful execution Cell searching uses and correspondence, and upgrade described temperature and operating frequency mapping table based on described record, or when predetermined r expires, obtain temperature information and corresponding frequency, and upgrade described temperature and operating frequency mapping table based on obtained temperature information and corresponding frequency, or when the frequency difference between the new frequency corresponding to same temperature value and old frequency is greater than predetermined frequency difference threshold value, described temperature and operating frequency mapping table is upgraded based on described new frequency.
In one embodiment of the invention, successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously.
In another embodiment of the present invention, the value of predetermined timer depends on the operating state of described Wireless Telecom Equipment, and described operating state comprises idle condition and single user state.
In yet another embodiment of the present invention, frequency determinative elements is configured to: the respective frequencies of the temperature information obtained in described temperature and operating frequency mapping table; And the frequency obtained respective frequencies is defined as performing Cell searching.
According to some embodiments of the present invention, frequency determinative elements is configured to further: if utilize the determined frequency for performing Cell searching to fail execution Cell searching, then the determined described frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And described search unit is configured to utilize described new frequency again to perform described Cell searching further.
According to another embodiment of the present invention, frequency determinative elements is configured to: if the frequency corresponding in described temperature and operating frequency mapping table of the temperature information obtained exceedes scheduled time threshold value from the time upgraded last time without the frequency distance corresponding to the temperature information upgraded or obtain is described temperature and operating frequency mapping table, then determine based on the frequency corresponding to obtained temperature information is in described temperature and operating frequency mapping table and predetermined frequency offset the frequency range performing Cell searching.
Embodiment of the present disclosure at least tool has the following advantages:
1., as long as first time Cell searching success, so at Cell searching afterwards, just can shorten the time of Cell searching cost, reduce available machine time when user uses, promote Consumer's Experience;
2. be easy to realize, and do not increase extra cost; And
3. at various communication standard, such as, can use in the system of Wideband Code Division Multiple Access (WCDMA) (WCDMA)/Time Division-Synchronous Code Division Multiple Access (TD-SCDMA)/Long Term Evolution (LTE).
Accompanying drawing explanation
The above and other aspects, features and advantages of various embodiment of the present invention will become apparent by the following specifically describes, and these specific descriptions provide by way of example with reference to accompanying drawing.In the accompanying drawings, identical Reference numeral indicates same or similar element, wherein,
Fig. 1 illustrates the temperature frequency deviation curve chart of DCXO;
Fig. 2 schematically shows the frequency deviation coverage diagram that employing original temperature-DAC value table carries out Cell searching;
Fig. 3 schematically shows the example wireless communications that methods and apparatus according to embodiments of the present invention can be employed;
Fig. 4 schematically shows the flow chart of exemplary method according to an embodiment of the invention;
Fig. 5 schematically shows the structured flowchart of exemplary device according to an embodiment of the invention; And
Fig. 6 schematically shows the structured flowchart of the equipment of the exemplary device comprised according to an embodiment of the invention as shown in Figure 5.
Embodiment
When crystal oscillator dispatches from the factory, factory can provide the temperature frequency deviation curve of a collection of crystal oscillator, as shown in Figure 1, and the frequency deviation of its instruction in each temperature.But due to the individual difference of each crystal oscillator, at each temperature spot, frequency deviation still has the fluctuation of general 0.5ppm.Further, aging along with passage of time and DCXO, also there will be ± frequency deviation the fluctuation of 3ppm scope.In addition, due to the difference of hardware single board design, current mobile phone reads DCXO crystal oscillator temperature and mostly adopts the mode using thermistor to read in its vicinity; Thermistor, to the reading accuracy of temperature and the distance between thermistor and crystal oscillator, cause the actual temperature of DCXO temperature and the DCXO read to have the maximum deviation more than 5 degree, and the frequency deviation that the temperature deviation of often spending causes may differ 0.4ppm.Therefore, if directly use the DCXO temperature read, the temperature frequency deviation curve that factory provides obtains the frequency deviation of corresponding temperature, then the value obtained and actual frequency deviation are also inconsistent; And consider from the upper factor affecting frequency deviation, can show that its deviation maximum possible exceedes ± 5ppm.This deviation is beyond the capture range of such as WCDMA system cell search algorithms, following situation will be caused, namely, if temperature read value and actual value difference very large, mobile phone employs again for a long time, namely aging very serious, then when Cell searching is carried out in start again, just need the method guarantee one successful execution Cell searching surely adopting frequency deviation all standing.The method of frequency deviation all standing is namely using the frequency values sum (being expressed as DV) after digital to analog converter (DAC) center frequency value of calibration and temperature-compensating as the central value of operating frequency, then respectively at DAC frequency values=DV-Δ D and DAC frequency values=DV+ Δ D place, respectively carry out a Cell searching more extraly, wherein, Δ D is frequency increment, and the frequency deviation of its correspondence should be in the frequency deviation coverage that cell search algorithms can support.As can be seen here, the method for frequency deviation all standing is adopted can to reach cause the time of Cell searching at original 3 times, as shown in Figure 2.And no matter first time starts shooting or follow-up start, in order to ensure Cell searching success, all needing to adopt in this way, and spending all possibly so much time.
Propose a kind of way herein, the method can make once the frequency values of DAC accurately at certain temperature is once obtained, then the DAC frequency values after at this temperature can both obtain more exactly.Thus ensure that frequency deviation is in cell search algorithms capture range when the follow-up Cell searching carried out.According to the method, if there is available cell, then usual Cell searching is carried out to this Cell searching just can success.This means that the time of each frequency being carried out to Cell searching is shortened, that is, be only equivalent to adopt frequency deviation all standing method to carry out 1/3 in Cell searching situation or lower.
Referring now to accompanying drawing, some preferred embodiments are more specifically described.But the disclosure can realize in every way, and therefore should not be construed as limited to embodiment disclosed herein.On the contrary, these embodiments are provided only for promoting the understanding to principle of the present disclosure.
In the following description, many details of embodiments of the invention have been set forth.But, should be appreciated that and can put into practice embodiments of the invention when there is no these details.In some instances, do not specifically illustrate known circuit, structure and technology, in order to avoid fuzzy understanding of this description.
Quoting the embodiment described by being intended to illustrate and can comprise specific features, structure or characteristic in this manual to " embodiment ", " embodiment ", " exemplary embodiment " etc., but not each embodiment necessarily comprises this specific features, structure or characteristic; And such phrase not necessarily refers to same embodiment.In addition, when describing specific features, structure or characteristic in conjunction with the embodiments, no matter whether clearly describe, all think that those skilled in the art can expect in conjunction with other embodiments to reflect such feature, structure or characteristic.Should be appreciated that singulative " ", " one " also comprise plural reference, indicate in addition unless context is clear and definite.
Shall also be noted that word " comprises " existence of other elements or the step not necessarily got rid of except listing.Shall also be noted that any Reference numeral does not limit the scope of claim.
Although for the ease of explaining, propose herein to vary with temperature the larger problem of frequency deviation jitter range under the background using digital compensation crystal oscillator (DCXO), but as skilled in the art will understand, embodiments of the invention are equally applicable to solve the frequency deviation problem caused due to other factors, thus cell search time is shortened.
With reference now to Fig. 3, briefly introduce the example wireless communications that methods and apparatus according to embodiments of the present invention can be employed.In the example of fig. 3, only for purposes of illustration, cordless communication network 300 is shown as honeycomb; Such as, but it will be appreciated by those skilled in the art that embodiments of the invention are equally applicable to other network configurations, such as, as long as wherein there is similar problem, there is the web search problem because frequency deviation causes in MANET (ad hoc).This cordless communication network comprises one or more base station 301.Because embodiments of the invention are not limited to the standard of this cordless communication network, such as GSM, WCDMA, TD-SCDMA, LTE etc., therefore, correspondingly base station 301 wherein also can be Node B, the Node B (eNB, or eNodeB) etc. of enhancing.Be appreciated that this base station also can adopt the forms such as base station sub-system (BSSs), via node.Base station 301 is that the multiple subscriber equipmenies (UE) 302 in its coverage (such as community C1) provide wireless connections.Term " subscriber equipment " is also known as wireless communication terminal, mobile terminal, travelling carriage, machine-type communication (MTC) equipment etc., and comprises mobile phone, intelligent electric meter, transducer, has the computer etc. of wireless communication ability.This UE needs to carry out Cell searching to find suitable persistent district when starting shooting, and obtains radio communication service via this community.In addition, when current serving cell quality is deteriorated, such as, when there is radio jink failure with the connection of community C1, UE also can re-execute Cell searching to search out the new community that can be switched to, such as community C2.Carry out the operating frequency place search synchronizing signal that Cell searching is included in this community, after synchronous, UE receives and demodulates broadcast message, such as system information, to obtain the configuration of this community, and accesses this community accordingly.If therefore there is frequency deviation in UE, will the operating frequency of its search rate and searched community be caused to there is deviation, make Cell searching failure.The searching method of frequency deviation all standing as shown in Figure 2 can solve this problem, but precondition is frequency deviation to be needed to be in certain limit; And the method causes extend search time, because Cell searching needs repeatedly to search in this frequency deviation region of distance center frequency.
Utilize the method for embodiments of the invention, can solve the problem at least in part, shorten cell search time.Methods and apparatus according to embodiments of the present invention example is described in detail below in conjunction with accompanying drawing.
Fig. 4 schematically shows according to an embodiment of the invention, in a wireless device for shortening the flow chart of the exemplary method 400 of cell search time.The method can perform in UE302 for example, in fig. 3.As shown in Figure 4, the method comprising the steps of S401, for triggering based on event or upgrading the temperature and operating frequency mapping table set up in advance based on the predetermined cycle; Step S402, for obtaining temperature information; Step S403, for determining based on obtained temperature information and temperature and operating frequency mapping table the frequency performing Cell searching; And step S404, for performing Cell searching according to the frequency determined.
According to one embodiment of present invention, the method comprises step S40101 further, for wireless device shutdown or when being in idle condition by set up in advance and/or the temperature that is updated in step S401 and operating frequency mapping table be saved in nonvolatile memory (such as flash memory flash), and, step S40102, for reading temperature and operating frequency mapping table when this wireless device is started shooting from this nonvolatile memory.
According to another embodiment of the present invention, the method comprises the step S4001 for performing frequency calibration further; And for recording the step S4002 of the frequency after calibration and calibration temperature; And the temperature according to one embodiment of present invention, set up in advance and operating frequency mapping table can be set up in step S4003 according to frequency, calibration temperature and the corresponding relation given between temperature and frequency deviation after calibrating.In one embodiment of the invention, step S4001 can have been come by such as automatic frequency (AFC) process of calibrating, and this process can perform before this wireless device dispatches from the factory, or can in use perform.Utilize temperature when performing calibration, DAC center frequency value (hereinafter referred DAC frequency after calibration, DAC frequency values or operating frequency), and temperature-frequency deviation curve that crystal oscillator manufacturer provides, just can estimate to obtain DAC frequency values corresponding to each temperature.Such as, the DAC frequency F that temperature K is corresponding
kcan be represented as:
F
k=F
calibration-Δ F
t+ Δ F
k, (1)
Wherein F
calibrationrepresent the frequency after calibration, Δ F
tfor the frequency deviation value that calibration temperature T is corresponding, and Δ F
kfor the frequency deviation value that temperature K is corresponding; It is 25 degree that temperature T is defaulted as, or obtains via measurement, such as, obtain via thermosensitive resistance measurement; Δ F
twith Δ F
kall can obtain according to temperature-frequency deviation curve.According to one embodiment of present invention, can according to the F obtained
kand corresponding temperature K sets up temperature and operating frequency mapping table (hereafter showing also referred to as temperature-DAC) in advance.This temperature and operating frequency mapping table can be stored in nonvolatile memory, and read when each start, and are updated in step S401.According to another embodiment of the present invention, about the DAC frequency value F that each temperature K is corresponding
kcalculating it is also conceivable to the corresponding relation slope of the frequency deviation-DAC value obtained for each single board calibrating, if the available words of these data.
According to another embodiment of the present invention, trigger based on event in step S401 or upgrade this temperature set up in advance based on the predetermined cycle and comprise with operating frequency mapping table: recording frequency and corresponding temperature that successful execution Cell searching uses, and based on this record renewal temperature and operating frequency mapping table.Because Cell searching successfully means that the operating frequency of search rate and this community is aimed at, therefore, if next time perform Cell searching time temperature-resistant, or change is little, then directly can read DAC frequency values corresponding to this temperature, DCXO corresponding registers is set, utilizes this frequency to carry out Cell searching, instead of utilize the method for frequency deviation all standing as shown in Figure 2.The frequency of the successful execution of record Cell searching and corresponding temperature is utilized to upgrade temperature and operating frequency mapping table, to make it possible to first read temperature when performing Cell searching, serviceability temperature obtains corresponding search rate with operating frequency mapping table, shortens cell search time.According to one embodiment of present invention, successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously, such as, when the broadcast message block received continuously is more than 3 pieces, then thinks Cell searching success.In another embodiment, also successful execution Cell searching can be defined as and search community and receive access this community necessary configuration information, such as system information block 1 (SIB1).
In another embodiment of the present invention, by obtaining temperature information and corresponding frequency when predetermined r expires to temperature and the renewal of operating frequency mapping table in step S401, and carry out based on obtained temperature information and corresponding frequency.Wherein temperature information such as can be obtained by thermosensitive resistance measurement, or utilizes other known methods of this area to obtain.Corresponding frequency can be, such as, and the frequency of nearest successful execution Cell searching use in this temperature, or by frequency that frequency calibration obtains.According to another embodiment of the present invention, the value of described predetermined timer depends on the operating state of described Wireless Telecom Equipment, and described operating state comprises idle condition and single user state.Such as, under Idle state, every a few minutes (according to circumstances can arrange, recommend 1 minute, not produce too much extra power consumption as well), read temperature, and corresponding DAC frequency values, once upgrade; Under special state, because its temperature rises very fast, once can upgrade every several seconds (but oneself is according to circumstances arranged, and recommends 30s).
According to another embodiment of the present invention, in step S401, the renewal of temperature and operating frequency mapping table is when being greater than predetermined frequency difference threshold value by the frequency difference between the new frequency corresponding to same temperature value and old frequency, is carried out based on this new frequency.This can prevent from upgrading temperature-operating frequency mapping table too continually.Such as, can specify that the principle upgrading this table is, when frequency deviation between the new DAC frequency values at this temperature and old DAC frequency values is greater than some HZ (such as 200HZ), or when both time differences exceed preset time (such as 1 month), just upgrade.
According to still another embodiment of the invention, be with stable to utilizing this correspondingly to upgrade temperature and operating frequency mapping table time corresponding during DAC frequency in temperature to temperature and the renewal of operating frequency mapping table in step S401.
In one embodiment of the invention, the frequency determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table in step S403 comprises: obtain the respective frequencies of temperature information in temperature and operating frequency mapping table obtained in step S402; And the frequency obtained respective frequencies is defined as performing Cell searching.Namely, if at such a temperature, there is Cell searching success and utilize corresponding DAC frequency to carry out renewal to temperature and operating frequency mapping table, then only needing to use this DAC frequency values to carry out a Cell searching, judging that whether Cell searching is successful according to the result of only once searching for.Because temperature and operating frequency mapping table can be thus continually updated in step S401, therefore, respective frequencies is wherein more accurate, and frequency deviation is less, thus the Cell searching frequency obtained like this can contribute to performing Cell searching rapidly.
According to some embodiments of the present invention, if utilize the determined frequency for performing Cell searching to fail execution Cell searching, such as (such as cause because mobile phone power-on interval time is long) owing to for a long time not upgrading with operating frequency mapping table in this temperature or due to the reasons such as device aging cause showing in corresponding data inaccurate, then the determined frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And the frequency utilizing this new performs described Cell searching again.In another embodiment of the present invention, if the frequency corresponding in temperature and operating frequency mapping table of the temperature information obtained in step S402 is from without renewal, or the time that the temperature information obtained frequency distance corresponding in this temperature and operating frequency mapping table upgraded last time has exceeded scheduled time threshold value, then determine based on the frequency corresponding in temperature and operating frequency mapping table of obtained temperature information and predetermined frequency offset the frequency range performing Cell searching, to make to fail to perform Cell searching to punctual (when namely may there is frequency deviation) at more than one frequency place completely in frequency, to improve the success rate of Cell searching.The method first-selection utilizes the temperature of renewal and operating frequency mapping table to obtain search rate, only not yet upgrade (namely in temperature and operating frequency mapping table, only have the original mappings table of the temperature of the curve acquisition provided according to crystal oscillator manufacturer and operating frequency available, wherein DAC frequency values may be forbidden) or when for a long time not upgrading, just can need to perform Cell searching in multiple frequency, therefore, compared with the method for frequency deviation all standing, the average time of Cell searching can still be shortened.
With reference now to Fig. 5, Fig. 5, schematically show according to an embodiment of the invention in a wireless device for shortening the structured flowchart of the exemplary device 500 of cell search time.This device 500 such as can be used to perform with reference to the either method in the method described by figure 4, but is not limited to for performing the method.According to one embodiment of present invention, this device 500 can be subscriber equipment 302 in Fig. 3 or its part.
According to one embodiment of present invention, this device 500 comprises updating block 501, is arranged to based on event triggering or upgrades the temperature and operating frequency mapping table set up in advance based on the predetermined cycle; Temperature acquiring unit 502, is arranged to acquisition temperature information; Frequency determinative elements 503, is arranged to the frequency determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table; And search unit 504, be arranged to and perform Cell searching according to the frequency determined.
According to one embodiment of present invention, device 500 comprises storage unit 505 further, when being arranged in the shutdown of this wireless device or being in idle condition by set up in advance and/or be updated the updated temperature of unit 501 and operating frequency mapping table and be saved in nonvolatile memory (such as, in flash), and reading unit 506, be arranged to when this wireless device is started shooting, read this temperature and operating frequency mapping table from this nonvolatile memory.This nonvolatile memory can be a part (such as a part for this storage unit 505) for device 500, or can be accessed by device 500 in some way.
According to another embodiment of the present invention, this device 500 comprises alignment unit 507 further, is arranged to execution frequency calibration; Record cell 508, is arranged to the frequency after record calibration and calibration temperature; And initialization unit 509, for setting up temperature and operating frequency mapping table in advance according to frequency, calibration temperature and the corresponding relation given between temperature and frequency deviation after calibration.In one embodiment of the invention, this alignment unit 507 can be calibrated (AFC) device by such as automatic frequency and come, and it can be configured to perform calibration before this wireless device dispatches from the factory, or can be configured in use perform benchmark.Utilize temperature when performing calibration, DAC center frequency value (hereinafter referred DAC frequency after calibration, DAC frequency values or operating frequency), and temperature-frequency deviation curve that crystal oscillator manufacturer provides, just can estimate to obtain DAC frequency values corresponding to each temperature.Equation (1) above gives a kind of example.The temperature that estimation obtains and DAC frequency values corresponding relation can be stored in nonvolatile memory as temperature and operating frequency mapping table; This table can read when each start, and is updated in step S401.According to another embodiment of the present invention, about the DAC frequency value F that each temperature K is corresponding
kcalculating it is also conceivable to the corresponding relation slope of the frequency deviation-DAC value obtained for each single board calibrating, if the available words of these data.According to another embodiment of the present invention, such as, when frequency calibration data are unavailable, also can utilize other data, such as estimated value, given constant etc. set up this temperature and operating frequency mapping table in advance.
According to another embodiment of the present invention, updating block 501 is arranged to the temperature of frequency that record successful execution Cell searching uses and correspondence, and based on the described record described temperature of renewal and operating frequency mapping table.Because Cell searching successfully means that the operating frequency of search rate and this community is aimed at, therefore, if next time perform Cell searching time temperature-resistant, or change is little, this search rate then can be directly utilized to carry out Cell searching, instead of utilize the method for frequency deviation all standing as shown in Figure 2, to shorten cell search time.According to one embodiment of present invention, successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously, such as, when the broadcast message block received continuously is more than 3 pieces, then thinks Cell searching success.In another embodiment, also successful execution Cell searching can be defined as and search community and receive the necessary configuration information in this community of access, such as, successfully receive system information block 1 (SIB1).
In another embodiment of the present invention, updating block 501 is arranged to and obtains temperature information and corresponding frequency when predetermined r expires, and carry out based on obtained temperature information and corresponding frequency.Wherein temperature information such as can be obtained by thermosensitive resistance measurement, or utilizes other known methods of this area to obtain.Corresponding frequency can be the frequency of nearest successful execution Cell searching use in this temperature, or by frequency that frequency calibration obtains.According to another embodiment of the present invention, the value of described predetermined timer depends on the operating state of described Wireless Telecom Equipment, and this operating state can comprise, such as, and idle condition and single user state.Such as, under Idle state, every a few minutes (according to circumstances can arrange, recommend 1 minute, not produce too much extra power consumption as well), read temperature, and corresponding DAC frequency values, once upgrade; Under special state, because its temperature rises very fast, once can upgrade every several seconds (but oneself is according to circumstances arranged, and recommends 30s).
According to another embodiment of the present invention, when updating block 501 frequency difference be arranged between the new frequency corresponding to same temperature value and old frequency is greater than predetermined frequency difference threshold value, based on this new frequency, temperature and operating frequency mapping table are upgraded.This can prevent from upgrading temperature-operating frequency mapping table too continually.Such as, can specify that the principle upgrading this table is, when frequency deviation between the new DAC frequency values at this temperature and old DAC frequency values is greater than some HZ (such as 200HZ), or when both time differences exceed preset time (such as 1 month), just upgrade.
According to still another embodiment of the invention, updating block 501 is arranged in temperature stable to utilizing this correspondingly to upgrade temperature and operating frequency mapping table time corresponding with during DAC frequency.
In one embodiment of the invention, frequency determinative elements 503, is arranged to the respective frequencies of temperature information in described temperature and operating frequency mapping table obtaining and obtain in temperature acquiring unit 502; And the frequency obtained respective frequencies is defined as performing Cell searching.Namely, if at such a temperature, there is Cell searching success and utilize corresponding DAC frequency to carry out renewal to temperature and operating frequency mapping table, then only needing to use this DAC frequency values to carry out a Cell searching, judging that whether Cell searching is successful according to the result of only once searching for.
According to some embodiments of the present invention, frequency determinative elements 503, the determined frequency for performing Cell searching is utilized to fail execution Cell searching if be arranged to, such as (such as cause because mobile phone power-on interval time is long) owing to for a long time not upgrading with operating frequency mapping table in this temperature or due to the reasons such as device aging cause showing in corresponding data inaccurate, then the determined frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And search unit 504 is performed described Cell searching again by the frequency being configured to further utilize this new.
In another embodiment of the present invention, if the frequency corresponding in temperature and operating frequency mapping table of the temperature information obtained in temperature acquiring unit 502 is from without renewal, or the time that the temperature information obtained frequency distance corresponding in this temperature and operating frequency mapping table upgraded last time has exceeded scheduled time threshold value, then determine based on the frequency corresponding in temperature and operating frequency mapping table of obtained temperature information and predetermined frequency offset the frequency range performing Cell searching, to make to fail to perform Cell searching to punctual (when namely may there is frequency deviation) at more than one frequency place completely in frequency, to improve the success rate of Cell searching.
According to one embodiment of present invention, in order to complete cell search process, device 500 can also comprise example other unit unshowned in figure, such as baseband signal processing unit and/or RF processing unit (such as measuring unit) or with the reception to support the down link signal from community such as interface unit of these unit.According to another embodiment of the present invention, these other unit also can be implemented in certain module in Fig. 5, such as, have been come by search unit 504.
Should be appreciated that device 500 can profit realize in various manners.Such as, in some embodiments, device 500 can utilize software and/or firmware module to realize.In addition, device 500 also can utilize hardware module to realize.Such as, device 500 can be implemented as integrated circuit (IC) chip or application-specific integrated circuit (ASIC) (ASIC).Device 500 also can be implemented as SOC (system on a chip) (SOC).In addition, device 500 also can utilize the combination of hardware module and software and/or firmware module to realize.Other modes that are known or exploitation in the future are also feasible now, and scope of the present invention is unrestricted in this regard.
Below with reference to Fig. 6, it illustrates the schematic block diagram of the exemplary user equipment (UE) 600 be suitable for for putting into practice the embodiment of the present invention.This subscriber equipment can be such as the UE302 in Fig. 3.In the example depicted in fig. 6, subscriber equipment 600 is mobile devices with wireless communication ability.But, be appreciated that this is only exemplary and nonrestrictive.The mobile terminal of other types also easily can adopt embodiments of the present invention, the voice of such as portable digital-assistant (PDA), beep-pager, mobile computer, mobile TV, game station, laptop computer, camera, video tape recorder, GPS device and other types and text communication system.Fixed mobile terminal easily can use embodiments of the present invention equally.
As shown in the figure, UE 600 comprises the one or more antennas 612 operationally communicated with receiver 616 with reflector 614.Utilize these equipment, UE 600 can perform and communicate with one or more base station (base station 301 in such as Fig. 3).UE 600 also comprises at least one processor 620.Should be appreciated that processor 620 comprises the circuit required for all functions realizing UE 600.Such as, processor 620 can comprise digital signal processor device, micro processor device, A/D converter, D/A converter and other support circuit.The control of UE 600 and signal processing function are according to these equipment capability distribution separately.According to one embodiment of present invention, processor 620 comprises the circuit for implementing hereinbefore either method described in reference diagram 4 or arbitrary device described in reference diagram 5.
UE 600 can also comprise user interface, such as, can comprise ringer 622, loud speaker 624, loudspeaker 626, display or view finder 628 and input interface 630, and all above equipment is all coupled to processor 620.UE 600 can also comprise the camera model 636 for capturing static image and/or dynamic image.According to one embodiment of present invention, the processor 620 that these user interfaces are coupled to can be another processor be separated with the processor for implementing either method described in reference diagram 4 or arbitrary device described in reference diagram 5.
UE 600 also comprises battery 634, such as vibrating battery group, for the various circuit supplies to operation UE 600, and alternatively provides mechanical oscillation as detectable output.In one embodiment, UE 600 also comprises one or more SIM card interface (such as 601,602), is respectively used to communicate with one or more SIM card.Cell searching also correspondingly can carry out according to different SIM card information; Such as updating block can be arranged to for the maintenance of different SIM card and upgrade independent temperature and operating frequency mapping table, and/or search unit can be arranged to the network execution Cell searching supported for different SIM card as required.
UE 600 also comprises memory device.Such as, UE 600 can comprise volatile memory 640, such as, comprises the volatile random access memory for temporary storaging data (RAM) in cache area.What UE 600 can also comprise other can be embed or moveable nonvolatile memory 642.Nonvolatile memory 642 additionally or alternatively can comprise such as EEPROM and flash memory etc.Memory can store the data that Arbitrary Term in multiple information segment and UE 600 use, to realize the function of UE 600.Such as, according to one embodiment of present invention, memory can storing temperature and operating frequency mapping table, and/or can comprise machine-executable instruction, its either method making processor 620 realize described by above-mentioned reference diagram 4 when being performed.
Should be appreciated that structured flowchart in Fig. 6 only illustration purpose and being illustrated, and the scope of not intended to be limiting theme of the present disclosure.In some cases, some assembly can increase according to concrete needs or reduce.
It should be noted that embodiments of the invention can be realized by the combination of hardware, software or software and hardware.Hardware components can utilize special logic to realize; Software section can store in memory, and by suitable instruction execution system, such as microprocessor or special designs hardware perform.Those having ordinary skill in the art will appreciate that above-mentioned unit and method can use computer executable instructions and/or be included in processor control routine to realize, such as, can provide such code on the programmable memory of mounting medium, such as read-only memory (firmware) of such as disk, CD or DVD-ROM or the data medium of such as optics or electrical signal carrier.Unit of the present invention and module thereof can be realized by the hardware circuit of the programmable hardware device of the semiconductor of such as very lagre scale integrated circuit (VLSIC) or gate array, such as logic chip, transistor etc. or such as field programmable gate array, programmable logic device etc., also with the software simulating performed by various types of processor, also can be realized by the combination such as firmware of above-mentioned hardware circuit and software.
Although it should be noted that the some devices or sub-device that are referred to equipment in above-detailed, this division is not enforceable.In fact, according to the embodiment of the present invention, the Characteristic and function of two or more devices above-described can be specialized in one apparatus.Otherwise, the Characteristic and function of an above-described device can Further Division for be specialized by multiple device.
In addition, although describe the operation of the inventive method in the accompanying drawings with particular order, this is not that requirement or hint must perform these operations according to this particular order, or must perform the result that all shown operation could realize expectation.On the contrary, the step described in flow chart can change execution sequence.Additionally or alternatively, some step can be omitted, multiple step be merged into a step and perform, and/or a step is decomposed into multiple step and perform.
It should be noted, embodiment of the present disclosure is not limited to communication standard, therefore, goes for such as GSM/WCDMA/TD-SCDMA/LTE wireless communication system.In addition, embodiments of the invention are also not limited to cellular communication system, but also go for other wireless networks of such as adhoc network, namely shorten the web search time by reducing frequency deviation.
Although describe the present invention with reference to some embodiments, should be appreciated that, the present invention is not limited to disclosed embodiment.The present invention is intended to contain the interior included various amendment of spirit and scope and the equivalent arrangements of claims.The scope of claims meets the most wide in range explanation, thus comprises all such amendments and equivalent structure and function.
Claims (19)
1., in a wireless device for shortening a method for cell search time, described method comprises:
Trigger based on event or upgrade the temperature and operating frequency mapping table set up in advance based on the predetermined cycle;
Obtain temperature information;
The frequency performing Cell searching is determined based on obtained temperature information and described temperature and operating frequency mapping table; And
Described frequency according to determining performs Cell searching.
2. method according to claim 1, comprises further:
Shut down at described wireless device or when being in idle condition, described temperature and operating frequency mapping table be saved in nonvolatile memory, and
When described wireless device start, read described temperature and operating frequency mapping table from described nonvolatile memory.
3. method according to claim 1, comprises further:
Perform frequency calibration;
Frequency after record calibration and calibration temperature; And
Temperature and operating frequency mapping table is set up in advance according to the frequency after described calibration, described calibration temperature and corresponding relation given between temperature and frequency deviation.
4. method according to claim 1, wherein, triggers based on event or upgrades described temperature based on the predetermined cycle and operating frequency mapping table comprises:
The temperature of the frequency that record successful execution Cell searching uses and correspondence, and upgrade described temperature and operating frequency mapping table based on described record; Or
When predetermined r expires, obtain temperature information and corresponding frequency, and upgrade described temperature and operating frequency mapping table based on obtained temperature information and corresponding frequency; Or
When frequency difference between the new frequency corresponding to same temperature value and old frequency is greater than predetermined frequency difference threshold value, upgrade described temperature and operating frequency mapping table based on described new frequency.
5. method according to claim 4, wherein said successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously.
6. method according to claim 4, the value of wherein said predetermined timer depends on the operating state of described Wireless Telecom Equipment, and described operating state comprises idle condition and single user state.
7. method according to claim 1, wherein comprises based on the frequency that obtained temperature information and described temperature and operating frequency mapping table determine performing Cell searching:
The respective frequencies of the temperature information obtained in described temperature and operating frequency mapping table; And
Obtained respective frequencies is defined as the frequency for performing Cell searching.
8. method according to claim 7, comprises further:
If utilize the determined frequency for performing Cell searching to fail execution Cell searching, then the determined frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And
Described new frequency is utilized again to perform described Cell searching.
9. method according to any one of claim 1 to 8, wherein comprises based on the frequency that obtained temperature information and described temperature and operating frequency mapping table determine performing Cell searching:
If the frequency corresponding in described temperature and operating frequency mapping table of the temperature information obtained exceedes scheduled time threshold value from the time upgraded last time without the frequency distance corresponding to the temperature information upgraded or obtain is described temperature and operating frequency mapping table, then determine based on the frequency corresponding to obtained temperature information is in described temperature and operating frequency mapping table and predetermined frequency offset the frequency range performing Cell searching.
10., in a wireless device for shortening a device for cell search time, described device comprises:
Updating block, is arranged to based on event triggering or upgrades the temperature and operating frequency mapping table set up in advance based on the predetermined cycle;
Temperature acquiring unit, is arranged to acquisition temperature information;
Frequency determinative elements, is arranged to the frequency determining performing Cell searching based on obtained temperature information and described temperature and operating frequency mapping table; And
Search unit, the described frequency be arranged to according to determining performs Cell searching.
11. devices according to claim 10, comprise further:
Storage unit, is saved in described temperature and operating frequency mapping table in nonvolatile memory when being arranged in described wireless device shutdown or being in idle condition, and
Reading unit, is arranged to when described wireless device start, reads described temperature and operating frequency mapping table from described nonvolatile memory.
12. devices according to claim 10, comprise further:
Alignment unit, is arranged to execution frequency calibration;
Record cell, is arranged to the frequency after record calibration and calibration temperature; And
Initialization unit, is arranged to the frequency after according to described calibration, described calibration temperature and corresponding relation given between temperature and frequency deviation and sets up temperature and operating frequency mapping table in advance.
13. devices according to claim 10, wherein said updating block is arranged to:
The temperature of the frequency that record successful execution Cell searching uses and correspondence, and upgrade described temperature and operating frequency mapping table based on described record; Or
When predetermined r expires, obtain temperature information and corresponding frequency, and upgrade described temperature and operating frequency mapping table based on obtained temperature information and corresponding frequency; Or
When frequency difference between the new frequency corresponding to same temperature value and old frequency is greater than predetermined frequency difference threshold value, upgrade described temperature and operating frequency mapping table based on described new frequency.
14. devices according to claim 13, wherein said successful execution Cell searching comprises and searches community and the quantity a predetermined level is exceeded threshold value of the broadcast message block received continuously.
15. devices according to claim 13, the value of wherein said predetermined timer depends on the operating state of described Wireless Telecom Equipment, and described operating state comprises idle condition and single user state.
16. devices according to claim 10, wherein said frequency determinative elements is configured to:
The respective frequencies of the temperature information obtained in described temperature and operating frequency mapping table; And
Obtained respective frequencies is defined as the frequency for performing Cell searching.
17. devices according to claim 16, described frequency determinative elements is configured to further:
If utilize the determined frequency for performing Cell searching to fail execution Cell searching, then the determined described frequency for performing Cell searching is added predetermined frequency offset, as the new frequency for performing Cell searching; And
Described search unit is configured to utilize described new frequency again to perform described Cell searching further.
18. according to claim 10 to the device according to any one of 17, and wherein said frequency determinative elements is configured to:
If the frequency corresponding in described temperature and operating frequency mapping table of the temperature information obtained exceedes scheduled time threshold value from the time upgraded last time without the frequency distance corresponding to the temperature information upgraded or obtain is described temperature and operating frequency mapping table, then determine based on the frequency corresponding to obtained temperature information is in described temperature and operating frequency mapping table and predetermined frequency offset the frequency range performing Cell searching.
19. 1 kinds of wireless devices, comprising:
Antenna and associated processing circuit, and
Device according to any one of claim 10 to 18.
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| US201461968129P | 2014-03-20 | 2014-03-20 | |
| US61/968,129 | 2014-03-20 |
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| CN104936263A true CN104936263A (en) | 2015-09-23 |
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| CN201510035595.9A Pending CN104936263A (en) | 2014-03-20 | 2015-01-22 | Method and device for reducing cell search time and wireless device |
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