CN1642336A - Method for searching down synchronous signal position in mobile communication system - Google Patents
Method for searching down synchronous signal position in mobile communication system Download PDFInfo
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- CN1642336A CN1642336A CN 200410000534 CN200410000534A CN1642336A CN 1642336 A CN1642336 A CN 1642336A CN 200410000534 CN200410000534 CN 200410000534 CN 200410000534 A CN200410000534 A CN 200410000534A CN 1642336 A CN1642336 A CN 1642336A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010295 mobile communication Methods 0.000 title claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 title claims description 64
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 241001269238 Data Species 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000001228 spectrum Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 101000821257 Homo sapiens Syncoilin Proteins 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/10—Arrangements for initial synchronisation
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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
- H04B1/7073—Synchronisation aspects
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Abstract
The invention relates to a method for searching downgoing synchronizing signal position in mobile communication system, including: regulating automatic gain of a receiver to saturate the receiver, and on the condition of the receiver being saturated, executing the follow steps: searching the rough position of downgoing synchronizing signal of one of multiple subframe data by using characteristic window determination method at some frequency point, and obtaining multiple rough positions, and finding the most possible rough position in multiple ones; succeeding in search and according to the most possible rough position, accurately regulating the downgoing synchronizing signal position l. It is a method adopting saturation method to search synchronizing signal position. It can avoid high-power interference, and can conveniently, exactly, effectively and quickly complete initial village searching.
Description
Technical field
The present invention relates to mobile communication technology, more precisely relate in mobile communication system such as Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) mobile communication system, thereby finish the method for initial cell search by the searching downlink synchronizing signal position fast.
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 between time slot TS0 and TS1 (DwPTS), the length of synchronizing signal (SYNC) section is 4 symbols (symbol) totally 64 chips, the GP on this SYNC section left side has 3 symbols totally 48 chips, and the GP on this SYNC section the right has 6 symbols totally 96 chips.Because the SYNC signal is full power transmissions, so the SYNC segment signal power that 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.SYNC1 is up guide time slot (UpPTS) among the figure.
A spread spectrum coefficient (SF) is 16 feature window construction shown in Fig. 2, can get the feature window of 8 symbol lengths, as shown in FIG., is made up of the SYNC section of middle 4 symbols and the GP of each 2 symbol of its both sides.When with the power sum of each 2 symbol (totally 4 symbols) of both sides during divided by the power sum of 4 symbols of SYNC section, the ratio that obtains should be very little.Under 5ms subframe structure condition of unknown, travel through whole reception data (with the power sum of each 2 symbol of both sides power sum) divided by middle 4 symbols, 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, present cell initial searching process comprises as shown in Figure 3:
At present, the algorithm that ICS adopts is earlier receiver gain to be adjusted to appropriate value, seek the position of synchronizing signal (SYNC) then with feature window criterion, search for a plurality of frequencies and (carry out the frequency ordering by received power in advance, and begin search from prominent frequency), search repeatedly (as five times) on each frequency.The disadvantage of this searching method be since when not considering to have around the terminal receiver large-signal to disturb to the problem that influences of its search, thereby the cell initial search success rate is lower, also promptly around the portable terminal receiver, exist large-signal to disturb, the mobile subscriber is arranged under the situation of making a phone call as the next door, what may search is this mobile subscriber's signal, and cell initial search is difficult for successfully.
Summary of the invention
The objective of the invention is to design the method for searching downlink synchronizing signal position in a kind of mobile communication system, not only can finish initial cell search fast but also can avoid large-signal to disturb, improve the success rate of initial ranging.
The inventive method is a kind of method of searching synchronizing signal (DwPTS) approximate location with saturation.
The present invention seeks to be achieved through the following technical solutions:
The method of searching downlink synchronizing signal position in a kind of mobile communication system, comprise: A. searches for the downlink synchronous signal of each sub-frame data in a plurality of sub-frame datas with feature window criterion on some frequencies approximate location obtains the approximate location of a plurality of downlink synchronous signals; B. from the approximate location of a plurality of downlink synchronous signals, find out the approximate location of the downlink synchronous signal of maximum possible; C. search for successfully, approximate location according to the downlink synchronous signal of this maximum possible is carried out the accurate adjustment of downlink synchronous signal position, it is characterized in that: before carrying out described steps A, adjust the receiver automatic gain, make the saturation of receiver, and under the situation of the saturation of receiver, carry out described steps A.
The described saturation of receiver that makes further comprises:
A. the control of receiver automatic gain is set to several grades by size;
B. earlier with receiver automatic gain control setting at minimum shelves;
C. judge whether receiver is saturated, directly carry out described steps A during the saturation of receiver, otherwise continue to carry out this step after the control of receiver automatic gain improved one grade, execution in step A again after the saturation of receiver.
Described steps A further comprises:
A1. on some frequencies, receive the data that subframe is complete;
A2. calculate the power of each each chip of symbol of this sub-frame data;
A3. set up the feature window at each chip position of this sub-frame data, calculate feature window power ratio on each chip position with feature window criterion;
A4. select minimum value from the whole power ratio of this sub-frame data, the pairing chip position of this minimum value is the approximate location of this sub-frame data downlink synchronous signal;
A5. judging whether the data of N subframe of this frequency have all been selected the approximate location of their downlink synchronous signal, is then to carry out described step B, carries out otherwise return steps A 1.
The present invention begins just to make the saturated down-going synchronous of finishing of received signal in initial ranging, thereby be a kind of method that adopts saturation search synchronizing signal position, because received signal is saturated, the feature of synchronous head is obvious, though and signal is also very big on other time slot, but do not have the synchronous head feature,, can effectively avoid high-power signal to disturb so can not influence search.By the present invention, can finish cell initial search more convenient, accurately and efficiently fast, improve the efficient and the accuracy of cell initial search.
Description of drawings
Fig. 1 is that spread spectrum coefficient is 16 o'clock 5ms subframe structure figure;
Fig. 2 is that spread spectrum coefficient is 16 o'clock a feature window construction;
Fig. 3 is the FB(flow block) that existing terminal receiver is carried out initial cell search;
Fig. 4 is the FB(flow block) of saturation search synchronizing signal position of the present invention;
Fig. 5 is received signal when saturated, the oscillogram of time slot TS0 and downward guide time slot DwPTS.
Embodiment
The present invention finishes down-going synchronous by the approximate location of saturation characteristics window method search DwPTS.Its key step comprises:
Earlier locking frequency point is being wanted on the synchronous frequency (in advance each frequency being sorted by received power principle from small to large, from prominent frequency); Make terminal receiver saturated by automatic gain control then; Under the situation of the saturation of receiver, get some frame data that receiver receives continuously by base station, adopt characteristics window search synchronous head, determine the approximate location of DwPTS; Do associative operation with associated code, determine the accurate position of DwPTS.
Further specify technology of the present invention below in conjunction with the embodiment accompanying drawing.
Referring to Fig. 4,, finish down-going synchronous by the approximate location of saturation characteristics window method search DwPTS.
Step 401 is adjusted the gain (automatic gain control AGC) of terminal receiver, makes the saturation of receiver.Usually the control of the automatic gain of terminal receiver is divided into several grades, can earlier gain be placed on minimum shelves, judges whether receiver is saturated, if there be not saturated then will the gain to improve one grade, so until the saturation of receiver.Judge receiver whether saturated be exactly the capacity limit of judging the receiver processing signals, if the signal strength signal intensity that receives reaches capacity, think that then receiver is saturated.Signal is saturated, but do not influence the feature of synchronous head, as shown in Figure 5, though received signal is saturated, but the feature of synchronous head is (signal power on the DwPTS SYNC section is apparently higher than the signal power on its both sides) still clearly, though the signal on the time slot TS0 is also very big, do not possess the feature of synchronous head, therefore can not influence search.Continue to carry out following step after the saturation of receiver.
Step 402 receives the complete data of a frame, and length is 400 symbols;
Step 403 is calculated the power P c of each chip of each symbol (chip);
Step 404 is set up the feature window at each chip position, calculates its feature window power ratio Ri, and i represents wherein any chip;
Step 405 is called the Log10float module and feature window power ratio Ri is done is asked logarithm (Log10) computing, and be about to Ri and show with dBm, and input find most module;
Step 406, find most module is selected minimum value minimun (Ri) from whole Ri, and the pairing chip position of this minimum value minimun (Ri) is the approximate location sync_pos of downlink synchronous signal DwPTS, and precision can reach ± 1 symbol;
Step 407 judges whether that the N frame is received data all uses saturation characteristics window method to judge the approximate location sync_pos of downlink synchronous signal DwPTS.For avoiding synchronous head by segmentation, should get the multiframe data continuously, suppose that N equals 5, receive then execution in step 408 of data if finished 5 frames, otherwise return step 402, continue to take off frame data.
Above-mentioned steps 402 to 407 has been finished the task with characteristics window search synchronous head, has determined the approximate location of a plurality of (equaling 5 in this example) DwPTS.
Step 408 is called find most module is found out maximum likelihood from the approximate location of this a plurality of (equaling 5 this example) DwPTS position.In the abovementioned steps, use characteristic window method search synchronous head is found out the Ri minimum value of each frame data, and is write down the position i at its place.The size of the i that frame data and former frame data are obtained relatively, in the present embodiment, when the approximate location of DwPTS has 5, if differing within 3 chips, the position of two i (comprises 3 chips), just think that these two sub-frame datas have same minimum value, the position of downlink synchronous signal is identical (promptly thinking same position) in two sub-frame datas; If the position of two i differs outside 3 chips, just think that the position of downlink synchronous signal is inequality in these two sub-frame datas.Count for number of subframes with identical downlink synchronous signal position, also to count for number of subframes with downlink synchronous signal inequality position, after the comparison of finishing whole 5 sub-frame data position i continuously, judge at last and whether have the number of subframes of identical downlink synchronous signal position greater than 2, if having the count value of some downlink synchronous signals position just to mean greater than 2 o'clock, i.e. judgement searches for successfully, and with the count value approximate location that is the downlink synchronous signal of maximum possible greater than 2 pairing downlink synchronous signal location determinations, if without any the count value of a downlink synchronous signal position greater than 2, just meaning search failure.
For example compare the i of the 2nd sub-frame data and the 1st sub-frame data for the first time, differ 3 chips, the number of subframes that then will have identical downlink synchronous signal position counts 2; Compare the i of the 3rd sub-frame data and the 2nd sub-frame data for the second time, differ 4 chips, the number of subframes that then will have downlink synchronous signal inequality position counts 1; Compare the i of the 4th sub-frame data and the 3rd sub-frame data for the third time, differ 3 chips, the number of subframes that then will have identical downlink synchronous signal position counts 2; The i of the 4th comparison the 5th sub-frame data and the 4th sub-frame data differs 3 chips, and the number of subframes that then will have identical downlink synchronous signal position is counted 3 (greater than 2).Judge that at last the 3rd, 4,5 subframes have identical downlink synchronous signal position, count value is searched for successfully greater than 2, and this position is the approximate location of the downlink synchronous signal of maximum possible.
In the above-mentioned example, if compare the i of the 4th sub-frame data and the 3rd sub-frame data for the third time, differ 4 chips, the number of sub frames that then will have identical downlink synchronous signal position counts 1; The i of the 4th comparison the 5th sub-frame data and the 4th sub-frame data, differ 4 chips, the number of sub frames that then will have identical downlink synchronous signal position counts 1, judges that at last the 1st, 2 subframes have identical downlink synchronous signal position, count value is not more than 2, the search failure.
Above judgement is carried out in find most module, and find most module is also to searching for success or mark is made in failure.
Step 409 judges whether success or fail flag Icsfailflag equal 0, equals 0 search successful execution step 410, otherwise search failure execution in step 411;
Step 410 is searched for and is successfully found DwPTS, and frequency points corresponding is kept in the form, is used for the subsequent step of Cell searching, further carries out the accurate adjustment of DwPTS position by make relevant operation of associated code, determines the exact position of DwPTS;
Step 411, if do not find synchronous head, the login failure that satisfies condition, i.e. search failure, then filter out this frequency, can select next time high-power frequency, search for the big frequency of next power, repeat this flow process (from step 401), up to finding synchronous head and logining successfully.
Traditional way is when carrying out the downlink synchronous signal location finding, allows operation of receiver suitably increase Benefit is lower, in case because the saturation of receiver impacts then can for the reception signal, make wave distortion, demodulation Signal is imperfect. Method of the present invention then utilizes the saturated down-going synchronous of finishing of reception signal (to finish down Row allows operation of receiver again under suitably gaining synchronously), can avoid high-power signal to disturb, by reality Existing the inventive method can make things convenient for, finish accurately and efficiently initial cell search, improves cell initial and searches The efficient of rope and accuracy.
Claims (6)
1. the method for searching downlink synchronizing signal position in the mobile communication system comprises:
A. the approximate location of searching for the downlink synchronous signal of each sub-frame data in a plurality of sub-frame datas with feature window criterion on some frequencies obtains the approximate location of a plurality of downlink synchronous signals;
B. from the approximate location of a plurality of downlink synchronous signals, find out the approximate location of the downlink synchronous signal of maximum possible;
C. search for successfully, carry out the accurate adjustment of downlink synchronous signal position, it is characterized in that according to the approximate location of the downlink synchronous signal of this maximum possible:
Before carrying out described steps A, adjust the receiver automatic gain, make the saturation of receiver, and under the situation of the saturation of receiver, carry out described steps A.
2. the method for searching downlink synchronizing signal position in the mobile communication system according to claim 1 is characterized in that the described saturation of receiver that makes further comprises:
A. the control of receiver automatic gain is set to several grades by size;
B. earlier with receiver automatic gain control setting at minimum shelves;
C. judge whether receiver is saturated, directly carry out described steps A during the saturation of receiver, otherwise continue to carry out this step after the control of receiver automatic gain improved one grade, execution in step A again after the saturation of receiver.
3. the method for searching downlink synchronizing signal position is characterized in that described steps A in the mobile communication system according to claim 1, further comprises:
A1. on some frequencies, receive the data that subframe is complete;
A2. calculate the power of each each chip of symbol of this sub-frame data;
A3. set up the feature window at each chip position of this sub-frame data, calculate feature window power ratio on each chip position with feature window criterion;
A4. select minimum value from the whole power ratio of this sub-frame data, the pairing chip position of this minimum value is the approximate location of this sub-frame data downlink synchronous signal;
A5. judging whether the data of N subframe of this frequency have all been selected the approximate location of their downlink synchronous signal, is then to carry out described step B, carries out otherwise return steps A 1.
4. the method for searching downlink synchronizing signal position in the mobile communication system according to claim 3, it is characterized in that: described N is taken as 5.
5. the method for searching downlink synchronizing signal position in the mobile communication system according to claim 1, it is characterized in that: a certain frequency in the described steps A, be that a plurality of frequencies are sorted by received power principle from small to large, and begin described search from prominent frequency.
6. the method for searching downlink synchronizing signal position in the mobile communication system according to claim 1 is characterized in that described step B further comprises:
B1. write down the minimum power ratio and the approximate location thereof of the downlink synchronous signal of 5 sub-frame datas;
B2. the downlink synchronous signal approximate location that compares back one sub-frame data and last sub-frame data;
B3. approximate location differs within 3 chips, judge that the downlink synchronous signal in these two sub-frame datas is same position, approximate location differs outside 3 chips, judge that the downlink synchronous signal in these two sub-frame datas is not same position, record has the number of sub frames of identical downlink synchronous signal position and has the number of sub frames of downlink synchronous signal inequality position respectively;
B4. execution in step B2, B3 repeatedly are until whole relatively intacter 5 sub-frame datas;
B5. whether last judgement has the number of sub frames of identical downlink synchronous signal position greater than 2, search for successfully greater than 2, and judge that count value is the approximate location of the downlink synchronous signal of described maximum possible greater than 2 pairing downlink synchronous signal positions, be not more than 2 search failures.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100005340A CN100337508C (en) | 2004-01-12 | 2004-01-12 | Method for searching down synchronous signal position in mobile communication system |
| PCT/CN2005/000041 WO2005069649A1 (en) | 2004-01-12 | 2005-01-12 | A method of searching the position of the down-link synchronous signal in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100005340A CN100337508C (en) | 2004-01-12 | 2004-01-12 | Method for searching down synchronous signal position in mobile communication system |
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| Publication Number | Publication Date |
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| CN1642336A true CN1642336A (en) | 2005-07-20 |
| CN100337508C CN100337508C (en) | 2007-09-12 |
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| CNB2004100005340A Expired - Fee Related CN100337508C (en) | 2004-01-12 | 2004-01-12 | Method for searching down synchronous signal position in mobile communication system |
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| WO (1) | WO2005069649A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1972156B (en) * | 2006-12-06 | 2011-03-23 | 重庆重邮信科通信技术有限公司 | Precise determining method for downlink synchronization slot under low signal-to-noise ratio |
| WO2011143905A1 (en) * | 2010-05-17 | 2011-11-24 | 中兴通讯股份有限公司 | Receiving apparatus and method for multi-frame synchronization |
| CN106102136A (en) * | 2016-08-23 | 2016-11-09 | 成都国恒空间技术工程有限公司 | A kind of searching method of FDD mobile telecommunication system down synchronizing signal |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2787660B1 (en) * | 1998-12-17 | 2001-03-09 | Cit Alcatel | SYNCHRONIZATION METHOD IN A TELECOMMUNICATION SYSTEM |
| US6480558B1 (en) * | 1999-03-17 | 2002-11-12 | Ericsson Inc. | Synchronization and cell search methods and apparatus for wireless communications |
| TW507458B (en) * | 2000-03-10 | 2002-10-21 | Ericsson Telefon Ab L M | Uplink synchronization signal transmission in TDD systems |
| CN1131653C (en) * | 2000-03-27 | 2003-12-17 | 信息产业部电信科学技术研究院 | Small-region initial search method for CDMA digital mobile communication system |
| JP2005525725A (en) * | 2002-01-21 | 2005-08-25 | シーメンス モービル コミュニケイションズ ソシエタ ペル アチオニ | Method and mobile station for initial cell search in time slot system |
| US20050147059A1 (en) * | 2002-03-05 | 2005-07-07 | Koninklijke Philips Electronics N.V. | Mobile terminal with down-link synchronisation via an iterative correlation system |
| CN1192650C (en) * | 2002-04-26 | 2005-03-09 | 华为技术有限公司 | Directly amplifying station and its mobile station locating method |
-
2004
- 2004-01-12 CN CNB2004100005340A patent/CN100337508C/en not_active Expired - Fee Related
-
2005
- 2005-01-12 WO PCT/CN2005/000041 patent/WO2005069649A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1972156B (en) * | 2006-12-06 | 2011-03-23 | 重庆重邮信科通信技术有限公司 | Precise determining method for downlink synchronization slot under low signal-to-noise ratio |
| WO2011143905A1 (en) * | 2010-05-17 | 2011-11-24 | 中兴通讯股份有限公司 | Receiving apparatus and method for multi-frame synchronization |
| CN106102136A (en) * | 2016-08-23 | 2016-11-09 | 成都国恒空间技术工程有限公司 | A kind of searching method of FDD mobile telecommunication system down synchronizing signal |
| CN106102136B (en) * | 2016-08-23 | 2019-11-05 | 成都国恒空间技术工程有限公司 | A kind of searching method of frequency division duplex mobile telecommunication system down synchronization signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100337508C (en) | 2007-09-12 |
| WO2005069649A1 (en) | 2005-07-28 |
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