CN102378349A - Cell synchronization realization method based on GPS information, apparatus thereof and system thereof - Google Patents
Cell synchronization realization method based on GPS information, apparatus thereof and system thereof Download PDFInfo
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- CN102378349A CN102378349A CN2010102548811A CN201010254881A CN102378349A CN 102378349 A CN102378349 A CN 102378349A CN 2010102548811 A CN2010102548811 A CN 2010102548811A CN 201010254881 A CN201010254881 A CN 201010254881A CN 102378349 A CN102378349 A CN 102378349A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a cell synchronization realization method based on GPS information, an apparatus thereof and a system thereof. The method comprises the following steps: acquiring a time point T1 of prestored radio frame timing boundary appeared in GPS timing, and acquiring a GPS timing T2 of a present GPS network; according to a time division duplex (TDD) system radio frame timing period Tperiod, the time point T1 and the GPS timing T2, carrying out calculation to obtain a rough time point T of the TDD system radio frame timing; according to the rough time point T, acquiring present TDD system radio frame timing, and realizing cell synchronization. According to the invention, by utilizing a relation between prestored radio frame timing and GPS timing, estimation of the present radio frame timing is completed, and purposes of simplifying a process of determining radio frame timing in a process that a terminal carries out cell synchronization, shortening synchronization time, raising cell synchronization efficiency and reducing system power consumption are realized.
Description
Technical field
The present invention relates to communication technical field, in particular, is that a kind of being applied to realized cell synchronizing method, Apparatus and system based on GPS information in the time-division system.
Background technology
Current; Terminal with GPS module is in the process of using; Can constantly receive timing after the unlatching GPS module since the GPS of GPS network, simultaneously, also will be from TDD (Time Division Duplex; Time division duplex) receives radio frames in the grid (comprising TD-LTE system and TD-SCDMA system) regularly, so that realize cell synchronizing.
In the prior art, the synchronizing process of TD-LTE system and TD-SCDMA system is difference to some extent: the TD-LTE system carries out cell synchronizing, at first need pass through master sync signal PSS (the synchronizing sub-frame symbol in the TD-LTE system; Different according to the position of different mode in subframe) detection-phase; It is relevant to utilize the time domain correlation properties of PSS to be shifted again, after finding its peak value, confirm 5 milliseconds field regularly, and then carry out auxiliary synchronous signals SSS detection-phase (position of SSS is relevant with PSS); The SSS detection-phase is a sub-district frame number of judging sub-district, place, terminal according to the correlated results on the frequency domain; And 10 milliseconds radio frames regularly, confirms regularly border of radio frames, again through decoding receiving system information (generally speaking; Adopt sliding window to decipher; This process possibly carried out 7 times at most), and finally obtain the frame number information of this sub-district accurately, accomplish cell synchronizing; The TD-SCDMA system finds thick sync bit roughly through DWPTS power window earlier, carries out precise synchronization through the synchronous code among the DWPTS again, obtains 5ms regularly, deciphers through the sliding window of receiving system message data and obtains frame regularly, accomplishes whole synchronizing process.
But; Run into when passing through cavern at the terminal or the sub-district when switching or the like after the situation, cell synchronizing need be carried out again in the terminal, in the prior art; Then adopt the mode of repetition above-mentioned steps; Promptly carry out the detection of synchronizing signal PSS and SSS again, confirm the regularly process on border of radio frames, accomplish the cell synchronizing at terminal.
Can know synchronously by above-mentioned; The inevitable shortcoming of prior art is, carries out again at the terminal in the process of cell synchronizing, and it is not only loaded down with trivial details and repeat to repeat the process of above-mentioned cell synchronizing; Cause and expended great amount of time, but also increased the power consumption of TDD system.
Summary of the invention
In view of this, the invention provides and a kind ofly realize cell synchronizing method, Apparatus and system, solved complex steps when cell synchronizing is carried out again in the terminal in the prior art, repetition, consuming time more and increase the problem of TDD system power dissipation based on GPS information.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
A kind of based on positioning GPS information realization cell synchronizing method, comprising:
Obtain the radio frames that prestores and regularly appear at the time point T1 in the GPS timing in the border, and the GPS timing T2 that obtains the Current GPS network;
Cycle T period, said time point T1 and current said GPS timing T2 regularly calculates according to the TDD system radio frames, obtains said TDD system wireless frame rough time point T regularly;
According to said rough time point T, obtain current said system TDD radio frames regularly, realize said cell synchronizing.
Preferably, the said radio frames that prestores of obtaining regularly appears at the time point T1 in the GPS timing in the border, is specially:
Obtain said TDD system wireless frame regularly with the GPS of GPS network regularly;
Detect and write down said radio frames and regularly appear at the time point T1 in the GPS timing in the border.
Preferably, after the said cell synchronizing of said realization, also comprise:
Obtain current said TDD system wireless frame precise time point T ' regularly;
Obtain the difference DELTA t between said precise time point T ' and the said rough time point T;
When said difference DELTA t less than 0 the time; The radio frames of upgrading current said TDD system according to said difference DELTA t regularly border appears at the time point T1 of GPS in regularly; The concrete mode of said renewal is: obtain said difference DELTA t and said rough time point T sum; Give said time point T1 with said both sums, accomplish and upgrade.
Preferably, after the said cell synchronizing of said realization, also comprise:
Obtain current said system TDD radio frames precise time point T ' regularly;
Utilize said precise time point T ', the radio frames of upgrading current said TDD system regularly border appears at the time point T1 of GPS in regularly, and the concrete mode of said renewal: giving said time point with said precise time point T ' is T1, accomplishes renewal.
Preferably, the said TDD system wireless of said foundation frame cycle T period, said time point T1 and said GPS regularly regularly T2 calculates, and the process that obtains said TDD system wireless frame rough time point T regularly is:
T＝T2-(T2-T1)％Tperiod+Tperiod。
A kind of device based on positioning GPS information realization cell synchronizing is characterized in that, comprising: initial module, memory module, GPS module, computing module and synchronization module;
Said initial module is used to obtain and preserve the radio frames timing of TDD system and the GPS timing of GPS network;
Said memory module is used for detecting and writing down said radio frames and regularly appears at said GPS time point T1 regularly in the border;
Said GPS module, the GPS that is used to obtain current said GPS network is T2 regularly;
Said computing module is used for calculating according to said TDD system wireless frame cycle T period, T1 and T2 regularly, obtains current said TDD system wireless frame rough time point T regularly;
Said synchronization module is used for according to said rough time point T, obtains current said system TDD radio frames regularly, realizes said cell synchronizing.
Preferably, said device also comprises: the judge module and first update module;
Said judge module is used to obtain the said TDD system wireless frame in synchronous back precise time point T ' regularly, and judges that whether difference DELTA t between said precise time point T ' and the said rough time point T is less than 0;
Said first update module was used at said difference DELTA t less than 0 o'clock, and the radio frames of upgrading current said TDD system according to said difference DELTA t regularly border appears at the time point T1 of GPS in regularly.
Preferably, said device also comprises: second update module;
Said second update module is used to obtain the said TDD system wireless frame in synchronous back precise time point T ' regularly, appears at the time point T1 in the GPS timing according to the radio frames timing border of the current said TDD of said precise time point T ' renewal system.
A kind of system based on positioning GPS information realization cell synchronizing comprises: terminal, GPS network and TDD subsystem with the said device of claim 6;
Said terminal, the radio frames that is used to obtain said TDD system regularly with the GPS of said GPS network regularly, detect and write down said radio frames and regularly appear at the time point T1 of GPS in regularly in the border, and the GPS timing T2 that obtains current said GPS network; And the said TDD system wireless frame of foundation cycle T period, T1 and T2 regularly calculates; Obtain said TDD system wireless frame rough time point T regularly; And obtain current said system TDD radio frames regularly according to said rough time point T, realize said cell synchronizing;
Said GPS network is used for to the said GPS of the continuous timed sending in said terminal regularly;
Said TDD subsystem is used for said terminal and sends the current wireless frame regularly.
Preferably, said TDD subsystem is specially time division multiple access TD-SCDMA system or Long Term Evolution TD-LTE system.
Can know via above-mentioned technical scheme; Compared with prior art; The invention discloses and a kind ofly realize cell synchronizing method, Apparatus and system, in the time of need carrying out cell synchronizing again at the terminal, obtain the GPS timing that radio frames that the TDD system sends is regularly sent with the GPS network through utilizing the terminal based on GPS information; Detect and write down said radio frames and regularly appear at the time point T1 in the GPS timing in the border, and the GPS timing T2 that obtains current said GPS network; And the said TDD system wireless frame of foundation cycle T period, T1 and T2 regularly calculates; Obtain said TDD system wireless frame rough time point T regularly; And obtain current said system TDD radio frames regularly according to said rough time point T, realize said cell synchronizing.According to cell synchronizing of the present invention; The GPS that radio frames timing that the TDD system that utilization gets access to sends and GPS network send regularly; And the relation of setting up between the two; In repeating the process of cell synchronizing, not only simplify the process of carrying out cell synchronizing, reduced the terminal and carried out expending time in of cell synchronizing, and reduced the power consumption of system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is that the embodiment of the invention is disclosed a kind of based on GPS information realization cell synchronizing method flow chart;
Fig. 2 is further embodiment of this invention disclosed method flow chart;
Fig. 3 is further embodiment of this invention disclosed method flow chart;
Fig. 4 is the disclosed a kind of device sketch map of realizing cell synchronizing based on GPS information of the embodiment of the invention;
Fig. 5 is the disclosed device sketch map of further embodiment of this invention;
Fig. 6 is the disclosed device sketch map of further embodiment of this invention;
Fig. 7 is the disclosed a kind of system schematic that realizes cell synchronizing based on GPS information of the embodiment of the invention.
Embodiment
For quote and know for the purpose of, the explanation of the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and sum up as follows:
TDD system: Time Division Duplex, time-division system;
TD-SCDMA system: Time Division-Synchronous Code Division MultipleAccess, TDS-CDMA system;
TD-LTE system: Time Division-Long Term Evolution, long evolving system;
PSS: be the subframe master's synchronizing symbol in the TDD system, different according to the position of different mode in subframe;
SSS: be the auxilliary synchronizing symbol of the subframe in the TDD system, the position of SSS is relevant with PSS.
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention discloses and a kind ofly realize cell synchronizing method seeing also accompanying drawing 1 based on GPS information, idiographic flow is as follows:
Step S101 obtains the radio frames timing of TDD system and the GPS timing of GPS network.
In the use of terminal, the radio frames that receives the transmission of TDD system regularly realizes cell synchronizing, and receives the GPS information that the GPS network timing sends by being arranged on the GPS module of opening on this terminal, and both are preserved in the terminal.
Step S102 detects and writes down said radio frames and regularly appears at the time point T1 in the GPS timing in the border.
When execution in step S102; The radio frames of the TDD system that obtains to the terminal regularly regularly detects with GPS, detects association between the two, promptly detects said radio frames and regularly appears at the time point T1 of GPS in regularly in the border; And be kept in the terminal, so that in needs, use.
Need to prove; When execution in step S101; Actual gps timing information and the radio frames of TDD system that is kept in the terminal regularly brought in constant renewal in, and therefore detected said radio frames regularly appears at the time point T1 of GPS in regularly and also brings in constant renewal in the border when execution in step S102.
Step S103 obtains the radio frames that prestores and regularly appears at the time point T1 in the GPS timing in the border, and the GPS timing T2 that obtains current said GPS network.
The terminal run into pass through cavern after or sub-district when switching or the like situation; Need carry out cell synchronizing again; This moment execution in step S103; Extract the radio frames that prestores at last in the terminal and regularly appear at the time point T1 in the GPS timing in the border, so that utilize this relation that exists to carry out cell synchronizing again between the two.
Step S 104, and cycle T period, said time point T1 and said GPS timing T2 regularly calculates according to said TDD system wireless frame, obtains said TDD system wireless frame rough time point T regularly.
Because; TDD system wireless frame cycle T period regularly is certain; Therefore, utilize radio frames that step S103 obtains regularly and the relation of GPS between regularly, promptly said time point T1 and said radio frames cycle T period regularly; And the GPS of the Current GPS network that obtains of execution in step S103 regularly T2 calculate, obtain current TDD system wireless frame rough time point T regularly.
Need to prove; When execution in step S104; The said TDD system wireless of said foundation frame cycle T period, said time point T1 and current said GPS regularly regularly T2 calculates, and the process that obtains said TDD system wireless frame rough time point T regularly is:
T＝T2-(T2-T1)％Tperiod+Tperiod。
Step S105 according to said radio frames rough time point T regularly, obtains current said system TDD radio frames frame regularly, realizes said cell synchronizing.
The rough time point T that the current wireless frame that obtains through calculating regularly occurs confirms regularly border of current wireless frame, can dope the radio frames timing of current system, realizes then utilizing this radio frames regularly to realize cell synchronizing.Utilize GPS that the terminal preserves in advance regularly and the relation of TDD system wireless frame between regularly in the present invention; And the cycle T period that regularly occurs of radio frames and the Current GPS network sends when carrying out cell synchronizing again GPS T2 regularly; Completion is to the roughly estimation regularly of current TDD system wireless frame; Thereby simplified the terminal and carried out seeking radio frames in the cell synchronizing process regularly again; Confirm the process on radio frames border, reduced the terminal and when carrying out cell synchronizing, expended time in, also reduced the power consumption of TDD system simultaneously.
In addition, the process of decoding generally adopts sliding window to decipher in the prior art, and this process possibly carried out 7 times at most; Through method disclosed by the invention; Simplify the terminal and in carrying out the cell synchronizing process, sought radio frames regularly, confirmed the process on radio frames border, therefore can reduce the maximum times that adopts sliding window to decipher; Based on cell synchronous method of the present invention, the maximum times when adopting sliding window to decipher can reduce to 3 times.
On the disclosed embodiment of the invention described above basis; After carrying out cell synchronizing again; The terminal will be preserved the GPS timing and TDD system wireless frame relation regularly of this moment again; Because the information regularly of the radio frames synchronously may have slight deviations in the process that terminal location constantly changes for what estimate.Therefore need to judge the deviation that possibly occur, and upgrade the GPS timing and TDD system wireless frame relation regularly that is stored in the terminal according to this deviation.
As shown in Figure 2, the step S101 in executing the invention described above embodiment is to step S105, and is further comprising the steps of:
Step S106 obtains current said system TDD radio frames precise time point T ' regularly.
Step S107 obtains the difference DELTA t between said precise time point T ' and the said rough time point T.
Whether step S108 judges said difference DELTA t less than 0, if less than 0, and execution in step S109; If, then do not transfer execution in step S110.
Step S109, the radio frames of upgrading current said TDD system according to said difference DELTA t regularly border appears at the time point T1 of GPS in regularly.
Step S110 keeps radio frames timing and GPS relation regularly, does not promptly carry out renewal.
In execution in step S108; Size to said difference DELTA t judges, when Δ t greater than 0 the time, then explanation; The current radio frames regularly time ratio radio frames timing border incoming terminal before of border incoming terminal is wanted evening; The position of the position that is to say current terminal and base station between wants far away, therefore do not need to put update time T1, i.e. execution in step S110; Otherwise, when Δ t less than 0 the time, then need the said time point T1 that preserve at the terminal be upgraded.
Therefore, need to judge whether to upgrade, can improve and obtain radio frames accuracy regularly in the process of carrying out cell synchronizing in the terminal.Simultaneously, simplified in the prior art for obtain radio frames accurately regularly continuous several times receive and the process of statistics, simplify synchronous flow process, shorten lock in time, improve synchronous accuracy, improve cell synchronizing efficient and reduce the purpose of system power dissipation thereby reach.
Need to prove that in above-mentioned disclosed embodiment, the radio frames of upgrading current said TDD system according to the said difference DELTA t regularly border concrete mode that appears at the time point T1 of GPS in regularly is:
T1＝T+Δt。
In addition, as shown in Figure 3, after the step S106 in executing the invention described above embodiment, can also not judge and directly upgrade, promptly comprise step in the present embodiment:
Step S111 utilizes said precise time point T ', and the radio frames of upgrading current said TDD system regularly border appears at the time point T1 of GPS in regularly, and the concrete mode of said renewal is T1=T '.
Owing in practical application, adopt calculated difference Δ t to carry out the judgment mode inaccuracy, therefore modes of directly upgrading that adopt guarantee next time in the accuracy of using T1 more.
In addition, in disclosed each embodiment of the invention described above, said TDD system can be specially present widely used time division multiple access TD-SCDMA system, also can be fast-developing at present Long Term Evolution TD-LTE system.
Describe in detail a kind of among the disclosed embodiment of the invention described above based on positioning GPS information realization cell synchronizing method; Can adopt the device of various ways to realize for method of the present invention; Therefore the invention also discloses a kind of device, provide concrete embodiment below and be elaborated based on positioning GPS information realization cell synchronizing.
As shown in Figure 4, mainly comprise in this device: initial module 401, memory module 402, GPS module 403, computing module 404 and synchronization module 405.
Need to prove, the GPS timing of the GPS network that initial module 401 is obtained and preserved, the GPS that regularly receives the transmission of GPS network owing to GPS module 403 regularly brings in constant renewal in; And in memory module 402 the up-to-date radio frames of storage regularly with GPS related between regularly, promptly preserve up-to-date radio frames and regularly appear at the time point T1 of GPS in regularly in the border.
When cell synchronizing need be carried out again in the terminal, obtain the GPS timing T2 that the current GPS network sends by GPS module 403, and be sent in the computing module 404.Simultaneously, according to the timing of TDD system wireless frame and GPS relation regularly of memory module 402 storages, i.e. cycle T period that time point T1, and TDD system wireless frame regularly occurs and current said GPS regularly T2 calculate in computing module 404.
In calculation process, T=T2-(T2-T1) %Tperiod+Tperiod.
The said TDD system wireless frame rough time point T regularly that utilizes computing module 404 to calculate obtains current system TDD radio frames regularly in synchronization module 405, confirm regularly border of current wireless frame, realizes cell synchronizing.Utilize the device among the embodiment disclosed by the invention; Utilize the radio frames timing and GPS relation regularly of preserving in the cell synchronizing process; Radio frames timing information when obtaining cell synchronizing roughly, thus simplify the efficient obtaining regularly flow process of radio frames in the prior art, improved cell synchronizing, shortened lock in time, also reduced the power consumption of TDD system.
For guaranteeing that the disclosed device of the embodiment of the invention can provide radio frames timing more accurately; As shown in Figure 5; The present invention discloses an embodiment again, mainly comprises: initial module 501, memory module 502, GPS module 503, computing module 504, synchronization module 505, judge module 506 and first update module 507.
In this embodiment disclosed by the invention, function, the structure of disclosed initial module 401, memory module 402, GPS module 403, computing module 404 and synchronization module 405 are identical in initial module 501, memory module 502, GPS module 503, computing module 504 and synchronization module 505 and the foregoing description repeats no more here.
Whether in judge module 506, judge said difference DELTA t less than 0, if then get into update module 507; If otherwise do not upgrade.
In addition, also can not carry out judgement, and directly upgrade.Therefore, the sketch map of another embodiment disclosed by the invention, as shown in Figure 6, on the basis of Fig. 4, only increased by one second update module 508.
T1 (T1=T+ Δ t or T1=T ') after upgrading is preserved in memory module 502; The radio frames deviation regularly that radio frames after can reducing synchronously regularly before provides with it; Avoiding the terminal is to obtain the process that accurate radio frames regularly constantly receives and adds up, and realizes that the process of cell synchronizing, reduction cell synchronizing expend time in, improve the accuracy of obtaining the radio frames timing in the cell synchronizing process, the purpose that improves cell synchronizing efficient and reduction system power dissipation thereby reach the simplification terminal.
Describe in detail a kind of among the disclosed embodiment of the invention described above based on positioning GPS information realization cell synchronizing method and device; Can be applicable to for device of the present invention in the system of various ways; Therefore the invention also discloses a kind of system, provide concrete embodiment below and be elaborated based on positioning GPS information realization cell synchronizing.
As shown in Figure 7, a kind of system based on positioning GPS information realization cell synchronizing mainly comprises: be provided with the terminal 701 of the device among the disclosed embodiment of the invention described above, and GPS network 702 and TDD subsystem 703.
Need to prove that in the disclosed system of the embodiment of the invention, said TDD subsystem specifically can be time division multiple access TD-SCDMA system, also can be Long Term Evolution TD-LTE system.
In sum:
Through embodiment of the invention disclosed method, Apparatus and system; Again carry out in the process of cell synchronizing at the terminal; Radio frames timing that main utilization prestores and the relation between the GPS timing; Completion is to the estimation regularly of current wireless frame, carries out confirming in the cell synchronizing process regularly process of radio frames, shortens lock in time, improves the efficient of cell synchronizing and reduces the purpose of system power dissipation thereby realize simplifying the terminal.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. realize it is characterized in that cell synchronizing method based on positioning GPS information for one kind, comprising:
Obtain the radio frames that prestores and regularly appear at the time point T1 in the GPS timing in the border, and the GPS timing T2 that obtains the Current GPS network;
Cycle T period, said time point T1 and current said GPS timing T2 regularly calculates according to the TDD system radio frames, obtains said TDD system wireless frame rough time point T regularly;
According to said rough time point T, obtain current said system TDD radio frames regularly, realize said cell synchronizing.
2. method according to claim 1 is characterized in that, the said radio frames that prestores of obtaining regularly appears at the time point T1 in the GPS timing in the border, is specially:
Obtain said TDD system wireless frame regularly with the GPS of GPS network regularly;
Detect and write down said radio frames and regularly appear at the time point T1 in the GPS timing in the border.
3. method according to claim 1 is characterized in that, after the said cell synchronizing of said realization, also comprises:
Obtain current said TDD system wireless frame precise time point T ' regularly;
Obtain the difference DELTA t between said precise time point T ' and the said rough time point T;
When said difference DELTA t less than 0 the time; The radio frames of upgrading current said TDD system according to said difference DELTA t regularly border appears at the time point T1 of GPS in regularly; The concrete mode of said renewal is: obtain said difference DELTA t and said rough time point T sum; Give said time point T1 with said both sums, accomplish and upgrade.
4. method according to claim 1 is characterized in that, after the said cell synchronizing of said realization, also comprises:
Obtain current said system TDD radio frames precise time point T ' regularly;
Utilize said precise time point T ', the radio frames of upgrading current said TDD system regularly border appears at the time point T1 of GPS in regularly, and the concrete mode of said renewal: giving said time point with said precise time point T ' is T1, accomplishes renewal.
5. method according to claim 1; It is characterized in that; The said TDD system wireless of said foundation frame cycle T period, said time point T1 and said GPS regularly regularly T2 calculates, and the process that obtains said TDD system wireless frame rough time point T regularly is:
T＝T2-(T2-T1)％Tperiod+Tperiod。
6. the device based on positioning GPS information realization cell synchronizing is applied to it is characterized in that in the terminal, comprising: initial module, memory module, GPS module, computing module and synchronization module;
Said initial module is used to obtain and preserve the radio frames timing of TDD system and the GPS timing of GPS network;
Said memory module is used for detecting and writing down said radio frames and regularly appears at said GPS time point T1 regularly in the border;
Said GPS module, the GPS that is used to obtain current said GPS network is T2 regularly;
Said computing module is used for calculating according to said TDD system wireless frame cycle T period, T1 and T2 regularly, obtains current said TDD system wireless frame rough time point T regularly;
Said synchronization module is used for according to said rough time point T, obtains current said system TDD radio frames regularly, realizes said cell synchronizing.
7. device according to claim 6 is characterized in that, said device also comprises: the judge module and first update module;
Said judge module is used to obtain the said TDD system wireless frame in synchronous back precise time point T ' regularly, and judges that whether difference DELTA t between the said rough time point T of said precise time point T ' is less than 0;
Said first update module was used at said difference DELTA t less than 0 o'clock, and the radio frames of upgrading current said TDD system according to said difference DELTA t regularly border appears at the time point T1 of GPS in regularly.
8. device according to claim 6 is characterized in that, said device also comprises: second update module;
Said second update module is used to obtain the said TDD system wireless frame in synchronous back precise time point T ' regularly, appears at the time point T1 in the GPS timing according to the radio frames timing border of the current said TDD of said precise time point T ' renewal system.
9. the system based on positioning GPS information realization cell synchronizing is characterized in that, comprising: terminal, GPS network and TDD subsystem with the said device of claim 6;
Said terminal, the radio frames that is used to obtain said TDD system regularly with the GPS of said GPS network regularly, detect and write down said radio frames and regularly appear at the time point T1 of GPS in regularly in the border, and the GPS timing T2 that obtains current said GPS network; And the said TDD system wireless frame of foundation cycle T period, T1 and T2 regularly calculates; Obtain said TDD system wireless frame rough time point T regularly; And obtain current said system TDD radio frames regularly according to said rough time point T, realize said cell synchronizing;
Said GPS network is used for to the said GPS of the continuous timed sending in said terminal regularly;
Said TDD subsystem is used for said terminal and sends the current wireless frame regularly.
10. system according to claim 9 is characterized in that, said TDD subsystem is specially time division multiple access TD-SCDMA system or Long Term Evolution TD-LTE system.
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| WO2008013404A1 (en) * | 2006-07-25 | 2008-01-31 | Electronics And Telecommunications Research Institute | Cell search method, forward link frame transmission method, apparatus using the same and forward link frame structure |
| CN101405986A (en) * | 2006-07-25 | 2009-04-08 | 韩国电子通信研究院 | Cell search method, forward link frame transmission method, apparatus using the same and forward link frame structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110662284A (en) * | 2018-06-28 | 2020-01-07 | 华为技术有限公司 | Method and device for correcting time information |
| CN110662284B (en) * | 2018-06-28 | 2021-05-11 | 华为技术有限公司 | Method and device for correcting time information |
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