CN1972156B - Precise determining method for downlink synchronization slot under low signal-to-noise ratio - Google Patents
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Abstract
This invention relates to one area initial index for down simultaneous time gap judgment method in low signal to noise proportion, which comprises the following steps: receiving N frame data in area initial indexing on UE and adopting characteristics window to judge each frame for three positions as DwPTS accurate positions with minimum proportion values for three prepare positions; then removing the prepare position with times as one and researching prepare position with best prance position.
Description
Technical field
The present invention relates to a kind of method that improves downlink synchronization slot determination rate of accuracy in the mobile communication system cell initial ranging, particularly the accurate decision method of downlink synchronization slot in the initial cell search under the low signal-to-noise ratio condition of the portable terminal in the 3-G (Generation Three mobile communication system) (abbreviating the TD-SCDMA system as).
Background technology
Initial cell search (becomes cell initial search usually, perhaps be called for short ICS) must search a proper cell as soon as possible when being meant portable terminal (abbreviating UE as) when start or being in mobile status, 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 descending synchronous code (Sync_DL, abbreviate Sync as) and basic training sequences (being commonly referred to Miamble) the sign indicating number number, and then, finally land the sub-district by detecting and demodulating process solves broadcast channel (abbreviating BCH as) information.
In the TD-SCDMA system, be provided with the sub-frame data that carries out initial cell search for UE.The sub-frame data structure has generally included the downlink synchronization slot (abbreviating DwPTS as) that is used for sending Sync.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.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 the performance number sum of left and right two sides GP sign indicating number segment encode sheet and Sync sign indicating number segment encode sheet, 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 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 two 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.Sync sign indicating number section in aforementioned search and the definite sub-frame data, and then the method for definite DwPTS position is commonly called " characteristics window ".
Yet, low signal-to-noise ratio (＜0dB) under the condition, because noise may flood communication signal, make the tram of DwPTS not necessarily, position of feature window power ratio minimum, if the position of still adopting feature window power ratio minimum just causes the misjudgement of Sync sign indicating number fragment position possibly as the tram of DwPTS, and then causes 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 propose a kind of under the low signal-to-noise ratio condition the accurate decision method of downlink synchronization slot in the initial cell search, when carrying out initial cell search, UE receives N frame (span of N is 1～10 usually) sub-frame data, adopt characteristics window to judge 3 position candidate that the position is the DwPTS tram that feature window power ratio minimum value may occur in each sub-frame data according to the difference principle, the maximum decidables of N frame data go out 3 * N position candidate, again with the descending ordering of 3 * N position candidate opsition dependent sequence number, and be the position candidate merger in certain precision same position candidate according to identity principle, then, remove occurrence number smaller or equal to 2 position candidate, the maximum position candidate of search occurrence number in the position candidate that remains, has only one as the maximum position candidate of occurrence number, then choose the tram that this position is DwPTS, be equipped with more than one as the maximum candidate bit of occurrence number, then the position candidate of selected characteristic window power ratio minimum is the tram of DwPTS in the maximum position candidate of occurrence number.
After aforementioned " difference principle " is meant and adopts characteristics window to calculate the feature window power ratio of a sub-frame data, intactly search for the feature window power ratio of this sub-frame data, search is also write down first minimum value and position, then the feature window power ratio of this position is made as the mean value of this subframe characteristics window power ratio, intactly search for the feature window power ratio of this sub-frame data once more and find second minimum value, if the absolute value of the difference of first minimum value and second minimum value is greater than Di, then finish this frame search, if be less than or equal to Di, then write down second minimum value and position, and the feature window power ratio of this position is made as the mean value of this frame feature window power ratio, intactly search for the feature window power ratio of these frame data once more and find the 3rd minimum value, if the absolute value of the difference of second minimum value and the 3rd minimum value is greater than Di, then finish this frame search, if be less than or equal to Di, then write down the 3rd minimum value and position, and finish this frame search, wherein, the span of the absolute value Di of minimum value difference is 0.05～0.2.
After the descending ordering of 3 * N position candidate opsition dependent sequence number that aforementioned " identity principle " searches out after being meant N frame data search being finished, if distance then is considered as them same position candidate less than having another or a plurality of position candidate in the scope of 2 or 3 or 4 sliding steps about a certain position candidate.
Adopt decision method of the present invention both can guarantee that the accuracy of cell initial search frame synchronization when height, middle signal to noise ratio reached 100%, the frame synchronization accuracy remains on higher level in the time of can guaranteeing low signal-to-noise ratio again.
Description of drawings
The partial data power of one frame data when Fig. 1 is 3dB for signal to noise ratio
The Partial Feature window power ratio curve chart of one frame data when Fig. 2 is 3dB for signal to noise ratio
Fig. 3 for signal to noise ratio is-the partial data power of one frame data during 3dB
Fig. 4 for signal to noise ratio is-the Partial Feature window power ratio curve chart of one frame data during 3dB
Fig. 5 is the FB(flow block) of decision method of the present invention
Fig. 6 accuracy rate that art methods and the inventive method DwPTS judge under the CASE1 channel circumstance relatively
Below in conjunction with drawings and Examples the accurate cut-in method of the present invention is further described.
The partial data power of one frame data when Fig. 1 is 3dB for signal to noise ratio, among the figure, abscissa is a number of chips, ordinate is a performance number.Set DwPTS time slot original position at 865 places.As can be seen from the figure, from the position 865 to the position " feature window " shape of 992 power curve is very obvious.
Fig. 2 is the Partial Feature window power ratio curve chart of signal to noise ratio shown in Figure 1 one frame data when being 3dB, and among the figure, abscissa is a number of chips, and ordinate is a feature window power ratio, and figure below is the partial enlarged drawing of last figure.The feature window power ratio of one frame data is calculated (it is 4 chips that step-length is set) when adopting " characteristics window " that signal to noise ratio is 3dB, obtains 1600 feature window power ratio.The partial data of this ratio is amplified, and the position that can obviously find out feature window power ratio minimum is at 217 places, and this place that is to say the correct original position of DwPTS.Need to prove that the DwPTS original position is 865 places in data power figure, after the sliding step conversion, its original position should be at 217 places of feature window power ratio figure.
From Fig. 1, Fig. 2 as can be known, when signal to noise ratio is big, adopt characteristics window can find the DwPTS position comparatively exactly.
Fig. 3 for signal to noise ratio is-the partial data power of one frame data during 3dB, and among the figure, abscissa is a number of chips, and ordinate is a performance number.Set DwPTS time slot original position at 865 places, but from the position 865 to the position 992 power curve can not find the shape of " feature window ".
The Partial Feature window power ratio curve chart of one frame data when Fig. 4 is a signal to noise ratio shown in Figure 3 for-3dB, among the figure, abscissa is a number of chips, and ordinate is a feature window power ratio, and figure below is the partial enlarged drawing of last figure.。The position of its feature window power ratio minimum is at 898 places, but this position is not correct DwPTS position, and correct DwPTS position is at 217 places of feature window power ratio, and the feature window power ratio of this position is not a minimum, but ascendingly is in the 3rd.
From Fig. 3, Fig. 4 as can be known, as signal to noise ratio hour (less than 0dB), because noise power is greater than communication signal power, may cause noise to flood useful signal, make that " feature window " is no longer obvious, its characteristic of correspondence window power ratio is not a minimum value, makes the tram of DwPTS not necessarily, position of feature window power ratio minimum, if the position of still adopting feature window power ratio minimum will cause erroneous judgement as the tram of DwPTS.
Embodiment
Fig. 5 is the FB(flow block) of decision method of the present invention, and the key step of decision method of the present invention is:
1, from 9 candidate's dominant frequency points, choose a frequency by power is descending, and definite frames received N;
2, receive the complete data (6400chip) of a frame, for the slip that guarantees that the feature window is can be on frame data complete, get the data that length is 6400+delta symbol, delta is the length of feature window: 8 symbols are totally 128 chip;
3, calculate the energy Pc of each chip in the frame.；
4, calculated characteristics window power ratio:
Wherein i represents " feature window " sequence number, P
I+kThe power of the individual symbol of k (k=0～7) in the expression " feature window ".
5, search and record minimum M in and position Pos thereof in the Ri data, this locational Ri value is set to the mean value of Ri, searches minimum M in1 once more in the Ri data, if the absolute value of the difference of Min and Min1 is then finished this frame search greater than numerical value Di; Otherwise, record Min1 and Pos1, and this locational Ri value is set to the mean value of Ri, in the Ri data, search minimum M in2 once more, if the absolute value of the difference of Min1 and Min2 is then finished this frame search greater than numerical value Di, otherwise record Min2 and Pos2 finish this frame search.
The span of the absolute value Di of common minimum value difference is 0.05～0.2.
Repeated for the 2nd～5 step, N frame feature window power ratio is calculated and the minimum value search up to finishing.
Be not difficult to find out that after each sub-frame data had been searched for, the feature window power ratio minimum value that finds may be 1 or 2 or 3, the feature window power ratio minimum value that the N frame data find is no more than 3 * N at most.
6, the descending ordering of maximum 3 * N position candidate opsition dependent sequence numbers that will find, and with distance about a certain position candidate less than existing another or a plurality of position candidate to be considered as same position candidate in the scope of 2 or 3 or 4 sliding steps, keep occurrence number greater than 2 position candidate.
7, from the position candidate that keeps, find out the maximum position candidate of occurrence number,, judge that then this position candidate is the tram of DwPTS if the maximum position candidate of number of times has only one; If the maximum candidate bit of number of times is equipped with more than one, judge that then the position candidate of feature window power ratio minimum in the maximum position candidate of occurrence number is the tram of DwPTS.
L-G simulation test
For the actual effect of checking decision method of the present invention, carried out l-G simulation test according to decision method of the present invention, be specially:
Simulated conditions:
Channel circumstance: the CASE1 of 25.102 regulations (CASE1 is meant that channel has a main footpath and one footpath, and with respect to directly main, inferior footpath postpones 2.93 μ s, i.e. 3.75chip, power attenuation 10dB)
Signal to noise ratio :-6～5dB
Time Slot Occupancy and power: with respect to TS0, DwPTS time slot power 0dB, other time slot is vacant
Simulation result:
This method all has the performance of fabulous performance under the various CASE channel circumstances of 25.102 regulations, Fig. 6 be the accuracy rate comparison of art methods and the DwPTS judgement of the inventive method under the CASE1 channel circumstance.As can be seen from the figure, compare with art methods, the inventive method can guarantee that the determination rate of accuracy of DwPTS tram under the high s/n ratio condition is suitable with prior art, and its determination rate of accuracy of judging the DwPTS tram all is 100%.And under the low signal-to-noise ratio condition, the determination rate of accuracy of decision method DwPTS of the present invention tram has very big lifting than prior art.
The inventive method also can have other various embodiments; without departing from the spirit and substance of the case in the method for the present invention; those skilled in the art work as can make various corresponding changes or distortion according to the inventive method, but these corresponding changes or distortion all belong to the claim protection range of the inventive method.
Claims (2)
1. the accurate decision method of downlink synchronization slot in the initial cell search under the low signal-to-noise ratio condition of the portable terminal in the TD-SCDMA system, adopt the judgment basis of feature window power ratio minimum value as downlink synchronization slot (DwPTS) tram, it is characterized in that: receive N frame sub-frame data, and adopt characteristics window to judge 3 position candidate that the position is the DwPTS tram that feature window power ratio minimum value may occur in each sub-frame data according to " difference principle ", the maximum decidables of N frame data go out 3 * N position candidate, again with the descending ordering of all position candidate opsition dependent sequence numbers, and be the position candidate merger in the predetermined accuracy same position candidate according to " identity principle ", remove occurrence number smaller or equal to 2 position candidate, the maximum position candidate of search occurrence number in the position candidate that remains, has only one as the maximum position candidate of occurrence number, then choose the tram that this position is DwPTS, be equipped with more than one as the maximum candidate bit of occurrence number, then the position candidate of selected characteristic window power ratio minimum is the tram of DwPTS in the maximum position candidate of occurrence number; Wherein:
After described " difference principle " is meant and adopts characteristics window to calculate the feature window power ratio of a sub-frame data, intactly search for the feature window power ratio of this sub-frame data, search is also write down first minimum value and position, then the feature window power ratio of this position is made as the mean value of this subframe characteristics window power ratio, intactly search for the feature window power ratio of this sub-frame data once more and find second minimum value, if the absolute value of the difference of first minimum value and second minimum value is greater than Di, then finish this frame search, if be less than or equal to Di, then write down second minimum value and position, and the feature window power ratio of this position is made as the mean value of this frame feature window power ratio, intactly search for the feature window power ratio of these frame data once more and find the 3rd minimum value, if the absolute value of the difference of second minimum value and the 3rd minimum value is greater than Di, then finish this frame search, if be less than or equal to Di, then write down the 3rd minimum value and position, and finish this frame search, wherein, the span of the absolute value Di of minimum value difference is 0.05～0.2;
After the descending ordering of maximum 3 * N position candidate opsition dependent sequence numbers that described " identity principle " searches out after being meant N frame data search being finished, if distance then is considered as them same position candidate less than having another or a plurality of position candidate in the scope of 2 or 3 or 4 sliding steps about a certain position candidate.
2. according to the described decision method of claim 1, it is characterized in that: the span that receiving data frames is counted N is 1～10.
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| CN1553586A (en) * | 2003-12-19 | 2004-12-08 | 大唐移动通信设备有限公司 | Descending synchronous calibrating method and apparatus for TD-SCDMA system |
| CN1642336A (en) * | 2004-01-12 | 2005-07-20 | 大唐移动通信设备有限公司 | Method for searching down synchronous signal position in mobile communication system |
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| CN1553586A (en) * | 2003-12-19 | 2004-12-08 | 大唐移动通信设备有限公司 | Descending synchronous calibrating method and apparatus for TD-SCDMA system |
| CN1642336A (en) * | 2004-01-12 | 2005-07-20 | 大唐移动通信设备有限公司 | Method for searching down synchronous signal position in mobile communication system |
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