CN1642337A - Quick frequency scanning method for howing estate primary searching - Google Patents
Quick frequency scanning method for howing estate primary searching Download PDFInfo
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- CN1642337A CN1642337A CN 200410000535 CN200410000535A CN1642337A CN 1642337 A CN1642337 A CN 1642337A CN 200410000535 CN200410000535 CN 200410000535 CN 200410000535 A CN200410000535 A CN 200410000535A CN 1642337 A CN1642337 A CN 1642337A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 claims description 25
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000010295 mobile communication Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention is a frequency scanning method for initial village searching, able to speed up initial village searching and including: a frequency point scanning course and a course of searching all the frequency pointed determined by frequency point scanning and obtaining the downgoing guide signal position. The frequency scanning course comprises a frequency rough scanning course and a frequency fine scanning courses. The frequency rough scanning course is using a n times fixed step frequency as interval to measure the maximum powers of all the frequency points and obtaining a group of spare frequency points with the maximum power values and according to the maximum power values, arranging all the spare frequency points; the frequency fine scanning course is measuring the maximum powers of all the spare frequency points by using a fixed step frequency as interval nearby the obtained spare frequency points by scanning, and obtaining another group of spare frequency points with the maximum power values and arranging this group according to the maximum power values. The course of searching by characteristic window determination method and obtaining downgoing guide signal position is executed in the frequency rough scanning course and also in the frequency fine scanning course.
Description
Technical field
The present invention relates to mobile communication technology, the frequency scanning method when relating to or rather finish initial cell search fast in time division duplex-CDMA mobile communication systems (TD-SCDMA).
Background technology
Initial cell search is meant that portable terminal (UE) searches the process that signs in to suitable cell from start, is called for short ICS.As in the TD-SCDMA system, UE is after powering on, need to search the sub-district that may exist, select the proper cell login then, UE is only after signing in to the sub-district, can obtain the information of adjacent cell and obtain the more detailed information in this sub-district, and further monitor the paging on the network or make a call and connect.
The subframe structure of the 5ms of TD-SCDMA shown in Fig. 1; in the downward guide time slot (DwPTS) between descending time slot TS0 and up TS1; the length of synchronizing signal (SYNC) section descending pilot frequency SYNC_DL sign indicating number is 4 symbols (symbol) totally 64 chips; the protection on this SYNC section left side GP at interval has 3 symbols totally 48 chip (not shown)s, and the protection on this SYNC section the right GP at interval has 6 symbols totally 96 chips.Because the SYNC signal is a full power transmissions, so the signal power of the SYNC section descending pilot frequency SYNC_DL sign indicating number that terminal receiver receives is very big, and the GP segment signal power that receives is very little, so from the angle of power spectrum, the SYNC section is compared with the received power of both sides GP section peak value (synchronous head feature) can occur.UpPTS among the figure (160 chip) is up guide time slot, and Switching Point is a switching point.
A spread spectrum coefficient (SF) shown in Fig. 2 is 16 feature window construction; can get the feature window of 8 symbol 128 chip lengths; as shown in FIG., form by the SYNC section descending pilot frequency SYNC_DL sign indicating number of 64 chips of middle 4 symbols and the protection interval GP of each 32 chip of 2 symbols of its both sides.When the power sum of totally 64 chips is divided by 4 symbols of middle SYNC section SYNC_DL sign indicating number during the power sum of totally 64 chips with each 2 symbol of both sides, the ratio that obtains should be very little.Under 5ms subframe structure condition of unknown, travel through whole reception data, promptly with the power sum of each 2 whole 64 chip of symbol of both sides power sum divided by middle 4 whole 64 chips of symbol, the position of ratio minimum promptly is the position of DwPTS, also can judge the approximate location of SYNC section thus.The feature window criterion of Here it is synchronizing signal position.
According to above-mentioned feature window criterion, the method of present initial cell search is: the received signal to all frequencies is searched for by feature window criterion, as adopt a kind of with 200kHz be at interval, to each frequency by the algorithm that frequently carries out the scanning search of feature window, in case obtain to carry out again after a certain frequency DwPTS (obtains the DwPTS signal location) synchronously other step of initial cell search, then can stop feature window search this moment to other frequency received signal; Perhaps, elder generation measures the power of all frequency received signals and sorts, carry out the search of feature window by the descending order of frequency power then, obtain a certain more high-power frequency DwPTS carries out cell initial search again synchronously other step, then can stop feature window search other smaller power frequency received signal.
Because the algorithm that initial cell search adopts need scan each frequency that is spaced apart 200kHz (by the communication protocol regulation), thereby speed is very slow.For accelerating just to search speed, can search all frequencies on the broadcast channel assigned table (the BA table: Broadcasting channel Allcation is provided by operator usually) earlier, if unsuccessful, search all frequencies again.However, under a lot of situation of search frequency,, still can not effectively promote the speed of cell initial search owing to still need many frequencies are all carried out scanning search.
Summary of the invention
The objective of the invention is to design a kind of rapid frequency scanning method of initial cell search, just search with the fast cell of realizing mobile communication system.The rapid frequency scanning method of initial cell search of the present invention can be applicable to have in the mobile communication system of feature window construction, comprises TD-SCDMA system, SCDMA system etc.
The objective of the invention is to be achieved through the following technical solutions: a kind of rapid frequency scanning method of initial cell search, comprise: frequency point scanning course, process with each frequency of determining through frequency point scanning is searched for acquisition downward guide signal location by feature window criterion is characterized in that:
Described frequency point scanning course comprises that frequency coarse scan and frequency fine sweep two processes;
The inswept journey of described frequency rough is that the frequency with a n times of fixed step size is the maximum power of the whole frequencies of interval measurement, obtains one group of alternative frequency of maximum power value, and by the size of maximum power value each alternative frequency is sorted;
The inswept journey of described frequency fine is in the frequency coarse scan and near the alternative frequency that ordering obtains, frequency with fixed step size is the maximum power of each alternative frequency of interval measurement, another of acquisition maximum power value organized alternative frequency, and by the size of maximum power value this organized alternative frequency and sort.
Described measurement maximum power comprises:
A. the automatic gain of adjusting the terminal receiver amplifier is controlled to maximum, measures the data that receive continuously on certain frequency, obtains one first maximum power value;
B. the automatic gain control with the terminal receiver amplifier reduces a rank, remeasures the data that receive continuously on certain frequency and obtains another second maximum power value;
C. obtain the difference between second power measurement values and first power measurement values, and compare with the power difference threshold of setting;
D. if difference less than the power difference threshold, with the maximum power measured value of second maximum power value as described this frequency, and the maximum power that finishes on this frequency is measured, if difference is greater than the power difference threshold, then with second power measurement values as first power measurement values, and return step b and carry out.
The process that obtains the downward guide signal location by the search of feature window criterion can be carried out in the inswept journey of frequency rough, also can carry out in the inswept journey of frequency fine.
Method of the present invention is not as prior art each frequency that is spaced apart 200kHz (frequency interval of fixed step size) to be pursued scanning frequently, but realizes rapid frequency scanning by two step sweeping schemes:
The first step: frequency coarse scan, n with 200kHz doubly is a frequency interval, carry out the coarse scan (as get n be integer between 1 to 8) of frequency, determine one (getting a prominent frequency) or one group of alternative frequency (frequency being sorted) by the frequency coarse scan, this or one group of alternative frequency that alternative frequency is carefully swept as the second step frequency by watt level;
Second step: frequency is carefully swept, and near frequency alternative frequency that coarse scan is determined, is that frequency interval carries out frequency and carefully sweeps with 200kHz, carefully sweeps definite one group of alternative frequency (frequency being sorted by watt level) by frequency.Sweep limits when frequency is carefully swept each time is in n 200kHz frequency range doubly.
The present invention is by doing the frequency coarse scan earlier and then make frequency and carefully sweep on frequency coarse scan basis, owing to reduced frequency number to be scanned effectively, thereby can accelerate frequency-scan speed; When the present invention states step in realization, related maximum power is finished by measurement, promptly the maximum power of each Frequency point is measured, also adjusted the automatic gain control (AGC) of terminal receiver, the frequency of search maximum power by the method that compares and measures value.
Description of drawings
Fig. 1 is a 5ms subframe structure schematic diagram in the TD-SCDMA system;
Fig. 2 is the feature window construction schematic diagram of Fig. 1 subframe structure;
Fig. 3 is first kind of embodiment FB(flow block) of rapid frequency scanning method of the present invention;
Fig. 4 is second kind of embodiment FB(flow block) of fast scanning method of the present invention.
Embodiment
In frequency scanning, need finish two tasks: first is that each frequency is carried out that maximum power is measured and by watt level frequency sorted; Second is synchronous by the feature window search acquisition DwPTS of each frequency of frequency ordering carrying out from front to back.In case it is synchronous to obtain DwPTS, then no longer other frequency that did not carry out the search of feature window is done the search of feature window.
The technical method that first coarse scan of the present invention is done carefully to sweep again on the coarse scan basis can have different implementations, respectively first kind of implementation as shown in Figure 3 and by second kind of implementation shown in Figure 4.
Referring to Fig. 3, first kind of scheme is: when carrying out the coarse scan of first step frequency, n with 200kHz doubly is a frequency interval, the maximum power of carrying out each frequency earlier measure and by the maximum power size to frequency sort (step 311), be the position (step 312) that is up to the downward guide synchronizing signal of time big some (number is selected on request) frequency by feature window criterion search maximum power again, obtain the synchronous maximum power frequency of DwPTS; When second step, frequency was carefully swept, near the frequency coarse scan obtains the synchronous maximum power frequency of DwPTS, be the interval with the 200kHz frequency again, the DwPTS signal is carried out power measurement and by watt level each frequency sorted, obtain one group of alternative frequency (step 321); Therefrom select a power to be maximum alternative frequency, on the basis of this frequency and DwPTS signal Synchronization, carry out other steps (step 33) of cell initial search again.Search for and successfully then finish initial cell search (step 34,35), otherwise return step 312, selecting maximum power is time big frequency, searches for the position of the downward guide synchronizing signal of this frequency again by feature window criterion.
Referring to Fig. 4, second kind of scheme is: when carrying out the coarse scan of first step frequency, n with 200kHz doubly is a frequency interval, the maximum power of carrying out each frequency is earlier measured and by watt level each frequency is sorted, and selects maximum power from being up to time several big (number is selected on request) alternative frequencies (step 411); When making frequency and carefully sweep in second step, earlier near each alternative frequency that coarse scan obtains, be the interval with the 200kHz frequency respectively, carrying out the maximum power of each frequency measures, obtain one group of alternative frequency, carry out frequency ordering (step 421) by the maximum power size again, the final feature window criterion of pressing again obtains the synchronous frequency (step 422) of DwPTS to alternative frequency search; On the basis of frequency that obtains thus and DwPTS signal Synchronization, carry out other steps (step 43) of cell initial search again.Search for and successfully then finish initial cell search (step 44,45), otherwise return step 422, selecting maximum power is time big frequency, searches for the position of the downward guide synchronizing signal of this frequency again by feature window criterion.
The difference of these two kinds of implementations is: search obtains the execution difference on opportunity of the synchronous frequency of DwPTS, and the former is after the frequency coarse scan, carefully carry out before sweeping, and the latter is in the frequency coarse scan, carefully carry out after sweeping.The former implementation result is better than the latter.
Maximum power related in the rapid frequency scanning scheme of above-mentioned initial cell search is measured (step 311,411 and 421), is that the maximum power of each Frequency point is measured.Because the power dynamic range of terminal received signal is very big, measure the signal power size of comparison different frequent points, receiver amplifier just can not be operated in the saturation region, and must operate at the linear work district.Therefore, need to measure the maximum power value of the received signal under the linear work district by the automatic gain control (AGC) of adjusting receiver.
The method that adopts is: judge by the measured value of comparison amplifier when the different operating frequency whether receiver is in the saturation region, and adjust AGC thus; After definite receiver is in the linear work district, finally determine the measured value of maximum power again.Concrete steps are as follows:
1) earlier receiver amplifier gain (AGC) is adjusted to maximum (such as, Gain=-35dBm), on a certain frequency fn, receive some frame data (as 2 frame data) continuously;
2) measure the maximum power value of this frequency fn, be designated as Pfn_tmp1 (for obtaining stable measured value, need select a plurality of sampled points (being a plurality of chips) to measure maximum power value to receiving data on this frequency, as from whole sampled points, choosing 30 bigger sampled points of power, again with the mean value of these sampled point power maximum power measured value Pfn_tmp1 as this frequency fn;
3) AGC gain is reduced a rank (such as 10dB), remeasure the maximum power value of this frequency fn, be designated as Pfn_tmp2 by the process in the above-mentioned steps;
4) setting power difference threshold P1 (such as 3dB), the maximum power measured value that compares this frequency fn of twice measurement: Pfn_tmp2-Pfn_tmp1, if difference is less than power difference threshold P1, receiver was all near the linear work district when twice measurement was described, the maximum power value Pfn that then assert this frequency fn be Pfn_tmp2 (think the linearity of back during one-shot measurement be better than before linearity during one-shot measurement, so get the latter's measurement result), the maximum power on the frequency fn is measured and is finished;
5) if difference greater than P1, illustrate and have an operation of receiver in twice measurement at least in the saturation region, then abandon the maximum power value of measuring for the first time, and the maximum power value that will measure for the second time is as the maximum power value of measuring for the first time: Pfn_tmp1=Pfn_tmp2, and return step 3), continue to do maximum power value measurement for the second time;
6) if receiver gain AGC has dropped to minimum rank, the maximum power value Pfn that then gets this frequency fn is Pfn_tmp2:Pfn=Pfn_tmp2, and the maximum power on the frequency fn is measured and finished.
Two step scanning methods of the present invention can realize sub-district search and raising success rate fast.The inventive method is not limited to the TD-SCDMA system, can adopt so long as have the mobile communication system of feature window construction, as the SCDMA system.
Claims (9)
1. the rapid frequency scanning method of an initial cell search comprises: frequency point scanning course and each frequency of determining through frequency point scanning obtained the process of downward guide signal location by the search of feature window criterion is characterized in that:
Described frequency point scanning course comprises that frequency coarse scan and frequency fine sweep two processes;
The inswept journey of described frequency rough is that the frequency with a n times of fixed step size is the maximum power of the whole frequencies of interval measurement, obtains one group of alternative frequency of maximum power value, and by the size of maximum power value each alternative frequency is sorted;
The inswept journey of described frequency fine is in the frequency coarse scan and near the alternative frequency that ordering obtains, frequency with fixed step size is the maximum power of each alternative frequency of interval measurement, another of acquisition maximum power value organized alternative frequency, and by the size of maximum power value this organized alternative frequency and sort.
2. the rapid frequency scanning method of initial cell search according to claim 1, it is characterized in that: the described process that obtains the downward guide signal location by the search of feature window criterion, in the inswept journey of frequency rough, carry out, one group of alternative frequency after sorted to frequency coarse scan acquisition, begin to obtain the downward guide signal location for maximum frequency from maximum power, the more alternative frequency that obtains the downward guide signal location is carried out the inswept journey of described frequency fine by the search of feature window criterion.
3. the rapid frequency scanning method of initial cell search according to claim 2, it is characterized in that: described alternative frequency to acquisition downward guide signal location is carried out the inswept journey of described frequency fine, be to obtaining the alternative frequency of downward guide signal location, frequency with described fixed step size is the power of interval measurement downward guide signal, obtain one group of alternative frequency, and by the size of descending pilot power value this is organized alternative frequency and sort, therefrom select the alternative frequency of maximum power to carry out other step of initial cell search.
4. the rapid frequency scanning method of initial cell search according to claim 1, it is characterized in that: the described process that obtains the downward guide signal location by the search of feature window criterion, in the inswept journey of frequency fine, carry out, carry out inswept journey of frequency rough and the inswept journey of frequency fine continuously, another group alternative frequency after sorted of frequency fine being swept acquisition obtains the downward guide signal location by the search of feature window criterion, carries out other step of initial cell search again.
5. the rapid frequency scanning method of initial cell search according to claim 1 is characterized in that:
In the inswept journey of described frequency rough, selecting maximum power value from the one group of alternative frequency that obtains is a maximum alternative frequency, carries out the inswept journey of described frequency fine again near this alternative frequency.
6. the rapid frequency scanning method of initial cell search according to claim 1, it is characterized in that: the frequency of described fixed step size is 200KHz, described n is any integer of 1 to 8.
7. the rapid frequency scanning method of initial cell search according to claim 1, it is characterized in that: described measurement maximum power comprises:
A. the automatic gain of adjusting the terminal receiver amplifier is controlled to maximum, measures the data that receive continuously on certain frequency, obtains one first maximum power value;
B. the automatic gain control with the terminal receiver amplifier reduces a rank, remeasures the data that receive continuously on certain frequency and obtains another second maximum power value;
C. obtain the difference between second power measurement values and first power measurement values, and compare with the power difference threshold of setting;
D. if difference less than the power difference threshold, with the maximum power measured value of second maximum power value as described this frequency, and the maximum power that finishes on this frequency is measured, if difference is greater than the power difference threshold, then with second power measurement values as first power measurement values, and return step b and carry out.
8. the rapid frequency scanning method of initial cell search according to claim 7, it is characterized in that: among the described step b, when the automatic gain control of terminal receiver amplifier is reduced to minimum rank, then with the maximum power measured value of second maximum power value as described this frequency, and the maximum power that finishes on this frequency is measured.
9. the rapid frequency scanning method of initial cell search according to claim 7, it is characterized in that: the data that receive continuously on the measurement frequency among described step a, the b obtain maximum power value, be to be sampled point with the chip, the power average value of getting high-power a plurality of sampled points is as described maximum power measured value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100005355A CN100405866C (en) | 2004-01-12 | 2004-01-12 | Quick frequency scanning method for howing estate primary searching |
| PCT/CN2005/000042 WO2005069650A1 (en) | 2004-01-12 | 2005-01-12 | Fast frequency scanning method of cell initial search |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100005355A CN100405866C (en) | 2004-01-12 | 2004-01-12 | Quick frequency scanning method for howing estate primary searching |
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| Publication Number | Publication Date |
|---|---|
| CN1642337A true CN1642337A (en) | 2005-07-20 |
| CN100405866C CN100405866C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100005355A Expired - Fee Related CN100405866C (en) | 2004-01-12 | 2004-01-12 | Quick frequency scanning method for howing estate primary searching |
Country Status (2)
| Country | Link |
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| CN (1) | CN100405866C (en) |
| WO (1) | WO2005069650A1 (en) |
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| CN101635938A (en) * | 2008-07-21 | 2010-01-27 | 俊茂微电子（上海）有限公司 | Features window detecting device and method capable of working under rapid AGC mechanism |
| CN1988415B (en) * | 2005-12-21 | 2010-04-14 | 大唐移动通信设备有限公司 | Method for judging downward pilot frequency signal transmission mode in CDMA communication system |
| CN101072438B (en) * | 2007-06-15 | 2010-09-29 | 中兴通讯股份有限公司 | Initial cell searching method for TD-SCDMA system mobile terminal |
| CN101494886B (en) * | 2008-01-21 | 2010-09-29 | 联芯科技有限公司 | Method and apparatus for implementing frequency points ordering under GSM/GPRS connection mode |
| CN101026390B (en) * | 2007-01-19 | 2010-10-13 | 重庆重邮信科通信技术有限公司 | Method for accurately determining downlink guaranteed time slot |
| CN101106394B (en) * | 2007-08-10 | 2010-11-10 | 中兴通讯股份有限公司 | Method for searching downlink pilot frequency slot in TD-SCDMA system |
| CN101883411A (en) * | 2010-05-27 | 2010-11-10 | 复旦大学 | Rapid frequency scanning method and device for initial cell search |
| CN1797990B (en) * | 2004-12-27 | 2010-12-08 | 上海宣普实业有限公司 | Method for scanning frequency points in TDS-CDMA system |
| CN1988427B (en) * | 2005-12-23 | 2011-01-26 | 上海华龙信息技术开发中心 | Method for accurately catching frequency in wide band CDMA communication system |
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| CN102202381A (en) * | 2010-03-26 | 2011-09-28 | 复旦大学 | Method for rapidly scanning frequency point of multiple cells |
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| CN102412864A (en) * | 2010-09-20 | 2012-04-11 | 联芯科技有限公司 | Downlink pilot time slot positioning method and system |
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| CN1988427B (en) * | 2005-12-23 | 2011-01-26 | 上海华龙信息技术开发中心 | Method for accurately catching frequency in wide band CDMA communication system |
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| Publication number | Publication date |
|---|---|
| WO2005069650A1 (en) | 2005-07-28 |
| CN100405866C (en) | 2008-07-23 |
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