CN1953609A - Accurate access method in the case of the initial search at the cell in TD-SCDMA system - Google Patents
Accurate access method in the case of the initial search at the cell in TD-SCDMA system Download PDFInfo
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- CN1953609A CN1953609A CNA2006100952128A CN200610095212A CN1953609A CN 1953609 A CN1953609 A CN 1953609A CN A2006100952128 A CNA2006100952128 A CN A2006100952128A CN 200610095212 A CN200610095212 A CN 200610095212A CN 1953609 A CN1953609 A CN 1953609A
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Abstract
The invention relates to an accurate access method of user terminal region initial search in TD-SCDMA wireless mobile communication system. Wherein, it uses characteristic window powder ratio as the reference to judge DwPTS position, the characteristic window slides on sub frame data with a step; and using the position with minimum characteristic powder ratio as DwPTS position; before calculating the characteristic window powder ratio, it calculates out the ratio of power sums of left and right data sections of characteristic window, or the ratio between power sun of middle data section and the difference of power sums of left and right data sections, to select the characteristic window position; the window met preset condition is effective characteristic window, or it is ineffective one; the calculates the characteristic window power ratio of effective position, the minimum effective ratio of ratio, as the position of Sync code, to find the DwPTS position.
Description
Technical field
Accurate cut-in method when the present invention relates to user terminal initial cell search in the TD-SCDMA mobile radio system (abbreviating TD-SCDMA as).
Background technology
Initial cell search in the TD-SCDMA system (is commonly referred to cell initial search, perhaps abbreviate ICS as) must search a proper cell when being meant mobile communication subscriber terminal (abbreviating UE as) start as soon as possible and insert (be commonly referred to and land) fast, so that the process of the service that the use network provides.The purpose of ICS is to allow UE and base station with frequency, synchronous, and the original position of definite radio frames, determine down-going synchronous (abbreviating Sync_DL as) and basic training sequences (abbreviating Basic Miamble as) the sign indicating number number, and then, finally land the sub-district by detecting and demodulating system broadcast channel (abbreviating BCH as) information.
For guaranteeing accurately landing of UE, obtain down-going synchronous information, in the TD-SCDMA system, be provided with the downlink synchronization slot (abbreviating DwPTS as) that is used for sending descending synchronous code (abbreviating Sync as).UE is by the Sync sign indicating number section in search and the definite sub-frame data, and then definite DwPTS position and land as access point.Therefore, UE determines accurately whether being directly connected to UE and whether accurately landing of DwPTS position.Usually; 4 symbols of Sync sign indicating number segment length are totally 64 chips; be provided with protection time slot (abbreviating GP as) sign indicating number section on the left and right two sides of Sync sign indicating number section, 3 symbols GP sign indicating number section of totally 48 chips is arranged on the left side of Sync sign indicating number section, be used for the hangover protection of conventional time slot 0 (abbreviating TS0 as).6 symbols GP sign indicating number section of totally 96 chips is arranged on the right side of Sync sign indicating number section, be used for the propagation delay time protection that uplink synchronous is set up process.Because the data of Sync sign indicating number section send with total power, and left and right two GP sign indicating number sections send with zero energy, therefore, do not having under the situation about disturbing, the performance number of comparing Sync sign indicating number section with the GP sign indicating number section on left and right two sides is " peak " value.If calculate the ratio of the performance number sum of chip in the performance number sum of chip in the GP sign indicating number section of left and right two sides and the Sync sign indicating number section, then this ratio will go to zero.The prior art cut-in method is according to above-mentioned feature, UE search for and definite sub-frame data in Sync sign indicating number fragment position the time set up a feature window earlier, the data structure of its feature window is similar to the data structure of Sync sign indicating number section position, the data segment of the data segment of 4 symbols and left and right each 2 symbol, composition characteristic window thus in the middle of promptly comprising.When UE carries out initial cell search, earlier begin to receive sufficiently long sub-frame data from random time, then, above-mentioned feature window slides on these cross-talk frame data, the ratio (abbreviating feature window power ratio as) of the performance number sum of the left and right both sides of while calculated characteristics window data segment chip and the performance number sum of middle data segment chip, when feature window power ratio hour, determine that promptly this position is the approximate location of Sync sign indicating number section, determine the DwPTS position thus.The slip of feature window on sub-frame data is to carry out with certain step-length, so-called step-length be meant the feature window sliding time every number of chips, be generally 1,2,4 or 8 chip.Specifically getting what value then determines according to the real-time and the complexity of practical application.
Yet the available machine time of UE is at random, and what begin to search for may not be the beginning of the frame data that sent of base station (being called Node B in the 3GPP agreement).In addition, because code division multiple access (abbreviating CDMA as) system is a self-interference system, other users or the base station of closing on all can produce interference to UE.When supposing the UE cell initial search, because UE is far away apart from Node B, make the performance number of the Sync sign indicating number section that UE receives less, if just with Node B communicate by letter at existing another UE in the scope of UE close together this moment, then may emergent power bigger interference business time-slot, make in the sub-frame data that the UE that carrying out cell initial search receives the performance number of Sync sign indicating number section less and at the bigger interference time slot of other position emergent powers.At this moment, cut-in method according to prior art, judge the position of Sync sign indicating number section by the position of sliding characteristics window searching feature window power ratio minimum, because the existence of more high-power interference time slot, the position of feature window power ratio minimum is exactly the position of the initial of high-power interference signal or end probably, just may cause the false judgment of Sync sign indicating number fragment position thus, and then cause the misjudgement of DwPTS position.If wrong judgement the DwPTS position, will cause descending synchronous code and basic training sequences sign indicating number to detect mistake, make UE read or read wrong BCH that finally cause the failure of UE initial cell search, UE can not land proper cell less than BCH.
Summary of the invention
The present invention proposes a kind of cut-in method that UE can precisely land that guarantees during initial cell search in the TD-SCDMA system, also the cut-in method of the influence that promptly the high-power interference time slot of opposing causes normal access in the down-going synchronous access procedure.Cut-in method of the present invention is the same with prior art, adopts feature window power ratio as the foundation of judging the DwPTS position, and the feature window slides on sub-frame data with certain step-length, and is the DwPTS position with the position of feature window power ratio minimum.Difference was before calculated characteristics window power ratio, elder generation is to the ratio of the performance number sum of chip in left and right two data segments of feature window, perhaps to the performance number sum of chip in the feature window middle data segment respectively with left and right two data segments of feature window in the ratio of difference of performance number sum of chip calculate, the feature window position is screened according to predetermined condition according to result of calculation, the feature window that satisfies predetermined condition is considered as the validity feature window, otherwise, be considered as invalid feature window.Then the feature window power ratio of active position is calculated, the active position of feature window power ratio minimum then is defined as the approximate location of Sync sign indicating number section, has also just determined the DwPTS position.Experimental results show that, adopt the ratio of the performance number sum of chip in left and right two data segments of feature window, the performance number sum that perhaps adopts chip in the feature window middle data segment respectively with left and right two data segments of feature window in the ratio of difference of performance number sum of chip the feature window is screened, satisfied effect can be obtained, the requirement that cut-in method of the present invention precisely lands can be satisfied.
Cut-in method of the present invention is according to the feature of high-power interference time slot, before calculated characteristics window power ratio, ratio according to the performance number sum of chip in the left and right data segment of feature window, perhaps in the feature window middle data segment performance number sum of chip respectively with left and right two data segments of feature window in the ratio of difference of performance number sum of chip the feature window is screened, effectively got rid of the influence of high-power interference time slot, make UE when carrying out cell initial search under the situation that high-power interference time slot exists, still can search the DwPTS position exactly.
Description of drawings
Fig. 1 is the 5ms of a TD-SCDMA system subframe structure schematic diagram
Fig. 2 (a) is that spreading factor is 16 feature window construction schematic diagram
Fig. 2 (b) is that spreading factor is 16 feature window measured waveform figure
Fig. 3 is the oscillogram of conventional time slot TS0, DwPTS time slot and high-power interference time slot
Fig. 4 is the feature window power ratio that adopts DwPTS position, the high-power interference time slot position left side and the high-power interference time slot position right side that the prior art cut-in method calculates
Fig. 5 is the search routine figure of cut-in method of the present invention
Fig. 6 is the percentage that prior art cut-in method and cut-in method of the present invention search out DwPTS position and high-power interference time slot position
Below in conjunction with drawings and Examples cut-in method of the present invention is further described.
Fig. 1 is 5ms sub-frame data structural representation in the TD-SCDMA system, comprises 400 symbols Totally 6400 chips. As seen from the figure, in sub-frame data except conventional time slot (TS0, TS1, TS2, TS3 ...) outside, also have a DwPTS time slot for UE search and affirmation. In Fig. 1 during DwPTS The crack is between conventional time slot 0 (referred to as TS0) and the conventional time slot 1 (referred to as TS1), at that time Crack length is 6 symbols totally 96 chips, and 4 symbols of Sync code segment length wherein are totally 64 chips.
Fig. 2 (a) is that spreading factor is 16 Window structural representation, as seen at Sync code Duan Zuo Face has 3 symbols GP code section of totally 48 chips, is used for the hangover protection of TS0 time slot. At Sync There is 6 symbols GP time slot of totally 96 chips on a code section right side, is used for uplink synchronous and sets up process The propagation delay time protection.
Fig. 2 (b) is that spreading factor is 16 feature window measured waveform figure.Because the data of Sync sign indicating number section send with total power, and about two GP sections be that 0 power sends, so from power, comparing Sync sign indicating number section with the GP sign indicating number section on left and right two sides is " peak " value.
Fig. 3 is the oscillogram of conventional time slot TS0, DwPTS time slot and high-power interference business time-slot, and 1 is the waveform of conventional time slot TS0 among the figure, and 2 is the waveform of DwPTS time slot, and 3 is the waveform of high-power interference business time-slot.When UE carries out cell initial search in distance Node B place far away, the performance number of the Sync sign indicating number section that UE receives is less, if just with Node B communicate by letter at existing another UE in the scope of UE close together this moment, then may emergent power bigger interference time slot, make in the sub-frame data that the UE that carrying out cell initial search receives the performance number of Sync sign indicating number section less and at the bigger interference time slot of other position emergent powers.
Fig. 4 is the feature window power ratio that adopts DwPTS position, the high-power interference time slot position left side and the right side, high-power interference business time-slot position that the prior art cut-in method calculates, 1 is the feature window power ratio of DwPTS position among the figure, 2 is the feature window power ratio on the left side, high-power interference business time-slot position, and 3 is the feature window power ratio on the right side, high-power interference business time-slot position.As seen from the figure, when having high-power interference time slot, calculate if adopt the prior art cut-in method to carry out feature window power ratio, the residing position of feature window power ratio minimum value, not near the DwPTS position, and disturb time slot near.If still judge Sync sign indicating number fragment position, just may cause the false judgment of Sync sign indicating number fragment position, and then cause the misjudgement of DwPTS position with the minimum value of feature window power ratio.
Fig. 5 is the search routine figure of cut-in method of the present invention.As seen from the figure, the key step of cut-in method of the present invention is:
1, receives the complete sub-frame data of a frame, for the slip that guarantees that the feature window is can be on frame data complete, get length and be 400+delta symbol (an additional delta symbol be for the feature window can complete slip on the data of a frame, the length of generally getting the feature window);
2, calculate the power P of each chip
c
3, set up the chip power value sum of 2 symbols of the feature window and the difference calculated characteristics window left side, i.e. A
i=P
i+ P
I+1The chip power value sum of 2 symbols in the feature window right side, i.e. B
i=P
I+6+ P
I+7The chip power value sum of middle 4 symbols, i.e. C
i=P
I+2+ P
I+3+ P
I+4+ P
I+5(wherein: P
iBe the performance number sum of continuous 16 chips, i=1,2 ..., (6400+delta)/N
Glide);
4, rated output ratio, i.e. F
i=A
i/ B
iPerhaps F
i=(C
i-A
i)/(C
i-B
i), if satisfy
The condition of (Thre gets 2～5) thinks that then this feature window position is effective; Otherwise, be invalid feature window position;
5, the feature window power ratio of calculated characteristics window active position, i.e. R
i=(A
i+ B
i)/C
i
6, on all feature window active positions, seek feature window power ratio R
i, R
iThe pairing chip position of minimum value is the approximate location of DwPTS.
Specific embodiment
For checking cut-in method of the present invention, carried out l-G simulation test according to cut-in method of the present invention, its result is:
Simulated conditions: narrowband Gaussian white noise (abbreviating AWGN as) channel circumstance ,-6～3dB
The average power of high-power interference time slot is 10 times of TS0 time slot and DwPTS time slot average power, and adopts 0.1 times AGC to adjust strategy
Fig. 6 is the percentage that prior art cut-in method and cut-in method of the present invention search out DwPTS position and high-power interference time slot position." old DwPTS pos " expression among the figure uses the prior art cut-in method to find the percentage of DwPTS position, " old IS pos " expression uses the prior art cut-in method to find the percentage of high-power interference time slot position, " new DwPTS pos " expression uses cut-in method of the present invention to find the percentage of DwPTS position, and " new IS pos " expression uses cut-in method of the present invention to find the percentage of high-power interference time slot position.As can be seen from the figure, cut-in method of the present invention can effectively be resisted the influence of high-power interference time slot, has reduced the wrong probability that searches out high-power interference time slot, and the accuracy rate that searches out DwPTS is obviously improved.
Cut-in method of the present invention is before calculated characteristics window power ratio, by predetermined condition the feature window is screened, can effectively avoid the interference of high-power signal, by cut-in method of the present invention can be effectively, convenient, finish the access of the down-going synchronous of cell initial search accurately, improved the efficient and the accuracy of cell initial search.And cut-in method of the present invention has only increased a mode decision scheme on the basis of prior art cut-in method, has reduced inoperative position feature window power ratio R simultaneously
iCalculating, do not increase too much computation complexity and workload on the whole, improved efficient on the contrary.
Cut-in method of the present invention also can have other various embodiments; under the situation of spirit that does not deviate from cut-in method of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes or distortion according to cut-in method of the present invention, but these corresponding changes or distortion all belong to the claim protection range of cut-in method of the present invention.
Claims (5)
1, accurate cut-in method during a kind of wireless telecommunications user terminal initial cell search, user terminal receives sufficiently long sub-frame data, and according to certain step-length sliding characteristics window on these cross-talk frame data, calculated characteristics window power ratio also compares, when feature window power ratio hour, determine that promptly this position is the approximate location of descending synchronous code (abbreviating Sync as) sign indicating number section, determine downlink synchronization slot (abbreviating DwPTS as) position thus, it is characterized in that before calculated characteristics window power ratio, earlier to a feature window left side, the ratio of the performance number sum of chip in right two data segments, perhaps to the performance number sum of chip in the feature window middle data segment respectively with a feature window left side, the ratio of the difference of the performance number sum of chip calculates in right two data segments, the feature window position is screened according to predetermined condition according to result of calculation, the feature window that satisfies predetermined condition is considered as the validity feature window, otherwise, be considered as invalid feature window, then the feature window power ratio of validity feature window is calculated, the validity feature window position of feature window power ratio minimum, be defined as the approximate location of Sync sign indicating number section, also be the DwPTS position.
2,, it is characterized in that the ratio of the performance number sum of chip in left and right two data segments of feature window is F according to the described cut-in method of claim 1
i=A
i/ B
i, wherein: A
i=P
i+ P
I+1, be the chip power value sum of 2 symbols in the feature window left side, B
i=P
I+6+ P
I+7The chip power value sum of 2 symbols in the feature window right side.
3, according to the described cut-in method of claim 1, the performance number sum that it is characterized in that chip in the feature window middle data segment respectively with left and right two data segments of feature window in the ratio of difference of performance number sum of chip be F
i=(C
i-A
i)/(C
i-B
i), wherein: A
i=P
i+ P
I+1Be the chip power value sum of 2 symbols in the feature window left side, B
i=P
I+6+ P
I+7Be the chip power value sum of 2 symbols in the feature window right side, C
i=P
I+2+ P
I+3+ P
I+4+ P
I+5Chip power value sum for 4 symbols in the middle of the feature window.
4,, it is characterized in that the predetermined condition of screening the validity feature window is according to the described cut-in method of claim 1
, wherein: Thre=2～5, F
i=A
i/ B
iOr F
i=(C
i-A
i)/(C
i-B
i), as the ratio F of the performance number sum of chip in left and right two data segments of feature window
i=A
i/ B
iSatisfy above-mentioned condition, perhaps in the middle data segment performance number sum of chip respectively with left and right two data segments of feature window in the ratio F of difference of performance number sum of chip
i=(C
i-A
i)/(C
i-B
i) satisfy above-mentioned condition, then this feature window is the validity feature window; Otherwise, be invalid feature window.
5, according to the described cut-in method of claim 1, it is characterized in that only the feature window power ratio of validity feature window being calculated and being compared, the validity feature window position of feature window power ratio minimum is defined as the approximate location of Sync sign indicating number section, also is the DwPTS position.
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| CNB2006100952128A CN100499870C (en) | 2006-11-16 | 2006-11-16 | Accurate access method in the case of the initial search at the cell in TD-SCDMA system |
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| CN100499870C CN100499870C (en) | 2009-06-10 |
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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 |
| CN101651976A (en) * | 2008-07-18 | 2010-02-17 | 俊茂微电子（上海）有限公司 | Method and device for detection and synchronization of broadcast channel propagation time interval |
| CN102412864A (en) * | 2010-09-20 | 2012-04-11 | 联芯科技有限公司 | Downlink pilot time slot positioning method and system |
| CN101394221B (en) * | 2007-09-17 | 2012-09-05 | 大唐移动通信设备有限公司 | Synchronization method, device and UE when measuring TD-SCDMA cell |
| CN101534150B (en) * | 2008-03-14 | 2012-10-10 | 中兴通讯股份有限公司 | Multiframe synchronization method for cell searching in TD-SCDMA system |
| CN102761895A (en) * | 2011-04-26 | 2012-10-31 | 普天信息技术研究院有限公司 | Neighbor cell timing synchronizing method of communication system |
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| CN101394221B (en) * | 2007-09-17 | 2012-09-05 | 大唐移动通信设备有限公司 | Synchronization method, device and UE when measuring TD-SCDMA cell |
| CN101534150B (en) * | 2008-03-14 | 2012-10-10 | 中兴通讯股份有限公司 | Multiframe synchronization method for cell searching in TD-SCDMA system |
| CN101651976A (en) * | 2008-07-18 | 2010-02-17 | 俊茂微电子（上海）有限公司 | Method and device for detection and synchronization of broadcast channel propagation time interval |
| CN101651976B (en) * | 2008-07-18 | 2013-11-06 | 俊茂微电子（上海）有限公司 | Method and device for detection and synchronization of broadcast channel propagation time interval |
| CN101651983B (en) * | 2008-07-18 | 2015-01-14 | 美满电子科技(上海)有限公司 | Downlink synchronization method and device used for communicating system |
| 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 |
| CN101651465B (en) * | 2008-07-21 | 2014-08-06 | 美满电子科技(上海)有限公司 | Carrier ordering method and device |
| CN101635938B (en) * | 2008-07-21 | 2014-11-12 | 美满电子科技(上海)有限公司 | Features window detecting device and method capable of working under rapid AGC mechanism |
| CN102412864A (en) * | 2010-09-20 | 2012-04-11 | 联芯科技有限公司 | Downlink pilot time slot positioning method and system |
| CN102761895A (en) * | 2011-04-26 | 2012-10-31 | 普天信息技术研究院有限公司 | Neighbor cell timing synchronizing method of communication system |
| CN102761895B (en) * | 2011-04-26 | 2014-11-26 | 普天信息技术研究院有限公司 | Neighbor cell timing synchronizing method of communication system |
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Assignee: Chongqing Xinke Design Co., Ltd. Assignor: Chongqing City Communication & Technology Co., Ltd. Contract record no.: 2011500000067 Denomination of invention: Accurate access method in the case of the initial search at the cell in TD-SCDMA system Granted publication date: 20090610 License type: Exclusive License Open date: 20070425 Record date: 20111227 |
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