CN1783752B - Method for obtaining broadcast information position in time-division duplex mobile communication system - Google Patents

Abstract

This invention discloses a method for obtaining broadcast information positions in the TDD mobile communication system, which is the method of utilizing the TDD system to control synchronization of multiple frames to express specific information positions with a same set of specific relative phase modulation information characterizing: A, increasing the operation method for judging phase modulation sequences, B, increasing the operation method for dynamically adjusting the judged thresholds. In this invention, terminal devices in the LCR mobile communication system can get the accurate positions of BCCH in short time when searching for areas.

Description

A kind of time division duplex moves the method for obtaining broadcast information position in low code check (TDD-LCR) communication system

Technical field

The present invention relates to the method that the relative chopping phase place value of a kind of employing indicates the customizing messages position of time division duplex (TDD) communication system, include but not limited to that TDD hangs down code check (LCR) mobile communication system, relate to the cell search process of subscriber equipment (UE) in the broadcast message acquisition process of terminal in these systems, particularly TDD LCR mobile communication system or rather.

Background technology

For a kind of communication system, particularly mobile communication system, reading of system information is the key point of receiving terminal connecting system.And in the system of TDD particularly in the middle of the mobile communication system of TDD, the position of the broadcast channel place frame (subframe) of bearing system information is generally reflected by one group of specific relative phase modulation intelligence.

In TD SDMA (TD-SCDMA) mobile communication system, the position of broadcast channel place frame (being a subframe in the LCR mobile communication system) is provided by relative modulation phase sequence between midamble in downlink synchronous sequence (SYNC-DL) and the TS0 time slot.As shown in Figure 1, for the LCR mobile communication system,, then show in the TS0 time slot of next frame and contain BCCH if the relative modulation phase sequence of the SYNC-DL of continuous 4 subframes is (135,45,225,135) degree.

Modulation phase sequence information is that UE obtains system information position and the synchronous key point of control multi-frame relatively.As depicted in figs. 1 and 2, in the LCR mobile communication system, the modulation phase sequence of the SYNC-DL that control may occur in the multi-frame has two kinds, i.e. S1 and S2, and next control multi-frame will be reused identical modulation phase sequence.In the LCR mobile communication system, then S1 will be used to indicate follow-up four frames and contain BCCH information, and S2 then is used to indicate follow-up four frames and does not contain BCCH information.

In the table 1 expression LCR mobile communication system, the relative modulation phase sequence of SYNC-DL:

Code name	Four phase places (degree)	Implication
			S1	135，45，225，135	Four frames contain BCCH information down
S2	315，225，315，45	Four frames do not contain BCCH information down

As known from Table 1, in the LCR mobile communication system, with regard to cell search process, search time, detection probability and probability of false detection etc. all have great importance.Therefore, the position that how to obtain S1 quickly and accurately just becomes a key, that is to say, search time should be short as much as possible, and detection probability should be high as much as possible.For example: detection probability should be greater than 95%, and probability of false detection should be less than 1%, and is not more than 1.5 times control multi-frame length search time.

Method and apparatus commonly used at present is that the data of collecting a large amount of frames (as 48 frames) are continuously carried out disposable judgement, this method and apparatus need wait for that the extremely long time just can judge, thereby make the time loss of whole cell search process maintain higher level all the time, if disposable judgement failure, judgement so next time needs to wait for identical time and frame number again, and this will can not put up with for the cellphone subscriber; On the other hand, for the LCR mobile communication system, because the position of BCCH has multiple periodicity and pattern, therefore the applicability of this method and apparatus in the LCR mobile communication system also reduces widely.

Summary of the invention

As mentioned above, in TDS-CDMA mobile communication system, how to make terminal equipment obtain the position of BCCH quickly and accurately, reduce probability of false detection, and shorten detection time, be technical problem to be solved by this invention, therefore, the object of the present invention is to provide the method for obtaining broadcast information position in a kind of time division duplex mobile communication system.

Technical solution of the present invention is as follows:

Obtain the method for broadcast information position in a kind of time division duplex mobile communication system, comprise the steps:

S11 ', four threshold values of initialization and make frame number K=0,

S12 ', reception next frame data, K=K+1,

S13 ', utilize midamble to carry out channel estimating, article one path of the estimating window of winning the confidence, prominent some footpaths and/or set noise gate and obtain channel estimation value,

S14 ', utilization are obtained the impulse response in footpath SYNC-DL are partly carried out phase place rotation and the merging of multipath information, thereby draw the estimated value r ' of SYNC-DL part _n,

SYNC-DL information after S15 ', utilization merge is carried out the estimation of phase modulation,

S16 ', whether judge frame number,, just return and carry out S12 ' if be not more than 3 greater than 3; If frame number greater than 3, is then carried out S17 ',

The phase modulation of S17 ', calculating K-3, K-2, K-1, four frames of K respectively and the back four frames S1 that contains BCCH information and back four frames do not contain similarity degree between the S2 of BCCH information,

Do you S18 ', judge that Ds1 (K-3) satisfies the requirement of certain threshold? if meet the demands, just carry out S19 '; Otherwise, carry out S20 ',

S19 ', the position that obtains the BCCH data block;

Are S20 ', judgement (K-3) 4 multiple? if not 4 multiple just returns and carries out S12 '; Otherwise, carry out S21 ',

The value of S21 ', the 1st to the 4 four thresholding of dynamic adjustments is returned then and is carried out S12 '.

Wherein, the phase modulation of Ds1 (K-3) expression K-3, K-2, K-1, four frames of K and back four frames contain the similarity degree of the S1 of BCCH information.

Advantage of the present invention is as follows: the device of searching the BCCH position in the LCR mobile communication system of the present invention, thereby the synchronous and cell search process of the control multi-frame of realizing travelling carriage, a kind of method of utilizing the dynamic gate limit value to obtain four phase matched has promptly been proposed, can make terminal equipment obtain the position of BCCH quickly and accurately, reduce probability of false detection, and shorten detection time.

Description of drawings

Fig. 1 is the interior four phase place schematic diagrames of control multi-frame of many minutes location mobile communication system of time division synchronization code.

Fig. 2 is the relative phase modulation schematic diagram of many minutes location mobile communication system of time division synchronization code.

Fig. 3 is the device calcspar that obtains the customizing messages position of the present invention.

Fig. 4 is the program flow diagram that is applied to obtain in the LCR mobile communication system BCCH position.

Embodiment

Provide two better embodiment of the present invention according to Fig. 3 and Fig. 4 below, further specify technical characterictic of the present invention and function characteristics, enable to illustrate better the present invention, but be not to be used for limiting protection scope of the present invention.

Referring to Fig. 3, it is a device calcspar that obtains the customizing messages position, and this device can apply to utilize the relative phase modulation intelligence of one group of N length to reflect the TDD communication system of customizing messages position.As shown in Figure 3, TDS-CDMA mobile communication system terminal of the present invention is obtained the device of broadcast information position, comprise that the consensus sequence maker 1, channel estimator 2, the multipath that become circuit to connect successively merge first decision device 6 and the dynamic adjustments decision threshold unit 7 of device 3, phase modulation estimator 5 and conduct judgement phase modulated sequence, this unit 7 comprises calculation element 71, second decision device 72 and the thresholding adjuster 73 that becomes circuit to connect successively; The input of this phase modulation estimator 5 is connected with the output of phase modulated carrying sequence generator 4; This channel estimator 2 and multipath merge device 3 and accept relative modulation phase sequence signal from mobile communication system respectively.

Described channel estimator 2 utilizes the consensus sequence of consensus sequence maker 1 generation (as midamble, training sequence etc., its effect is to play reference role in channel estimating) and received signal carry out channel estimating and channel estimating reprocessing, in implementation process, can use path trace device or path-searcher to specify the multipath parameter; Described multipath merges device 3 and adopts the information of channel estimator 2 that the carrying sequence part of the phase modulated in the input signal (as SYNC-DL) is carried out the multipath merging; Phase modulation estimator 5 carries out the phase modulation estimation of a frame (subframe) according to the input information that multipath merges device 3 and described phase modulated carrying sequence generator 4, and the output result can be hard decision value or soft-decision-value; Frame (subframe) number of 6 pairs of processing of first decision device is added up, and determines whether change calculation element 71 over to, has in fact also played an on-off action; 71 of calculation elements calculate " similarity degree " between nearest N frame (subframe) phase modulation estimated value and the set N length phase pattern, and " similarity degree " described here can adopt between the two " distance " or modes such as " correlations " to represent; Second decision device 72 is adjudicated according to the output result of decision threshold to calculation element 71, so that determine the position of customizing messages (as the BCCH data); If do not find the position of customizing messages as yet, this thresholding adjuster 73 will be according to the decision threshold of certain condition dynamic adjustments second decision device 72, its principle is to design different threshold values according to the different probability of specific N phase place occurring on the diverse location, loosen threshold requirement for the big place of specific N phase place probability occurring, otherwise then strengthen threshold requirement.

Referring to Fig. 4, it is to be example with the LCR mobile communication system, and a kind of algorithm performing step to device shown in Figure 3 is described.

Fig. 4 is applied to the program flow diagram that the LCR mobile communication system is obtained broadcast information position, it moves the device that obtains broadcast information position in the TDS-CDMA mobile communication system of the present invention shown in Figure 3, four thresholdings of step 11 initialization, make frame data K=0, step 12, receive next frame data K=K+i, with step 13, utilization is carried out channel estimating and carried out these three steps of reprocessing midamble is described consensus sequence maker 1 of operation and channel estimator 2, to obtain the multipath parameter of received signal; Wherein, step 13 realizes by described channel estimator 2;

Step 14 is that SYNC-DL part multipath information is merged, and it moves described multipath and merges device 3, adopts the information of channel estimator 2 that the carrying of the phase modulated in input signal sequence is partly carried out the multipath merging; Step 14 merges device 3 by described multipath and realizes;

Step 15 is to estimate the phase modulation of single frames SYNC-DL, and it moves described phase modulated carrying sequence generator 4 and phase modulation estimator 5, carries out the phase estimation of a frame (subframe).Step 15 realizes by described phase modulation estimator 5;

Is step 16 to judge that frame number is greater than 3? if greater than 3, execution in step 17 is if be not more than 3, then return step 12, it moves described first decision device 6, implements frame (subframe) number of handling is added up, if greater than 3, then send calculation element 71, otherwise continue to handle the next frame data; Step 16 realizes by described first decision device 6;

Step 17 is to calculate the similarity degree of nearest four phase modulations (being the phase modulation of K-3, K-2, K-1, four frames of K) and pre-set four phasetophases, it moves described calculation element 71, thereby makes calculation element 71 calculate " distance " or " correlation " of nearest N frame (subframe) phase modulation estimated value and known N length phasetophase; Step 17 realizes by described calculation element 71;

Is step 18 to judge that Ds2 (K-3) satisfies the requirement of certain threshold? if meet the demands, think then and found the S1 phase pattern that just execution in step 19, obtain the position of BCCH data block; Otherwise execution in step 20,

Step 18 and 19 realizes that by described second decision device 72 this second decision device 72 is adjudicated according to the output of calculation element 71, so that determine the position of customizing messages;

Is step 20 to judge that (K-3) is 4 multiple? if 4 multiple execution in step 21 then; Multiple if not 4, then return step 12, promptly move channel estimator 2, described second decision device 72 of step 20 operation, step 21 is then moved described thresholding adjuster 73, being thresholding adjuster 73 comes the setting thresholding of dynamic adjustments calculation element 71 according to certain condition, thus dynamic adjustments the 1st～4 four threshold value.Provide two embodiment below.

Embodiment one

Step 11, setting four initial threshold Threshold (1) be a certain value of interval in (2.5,4.5) to Threshold (4), for example 3.5,, in principle four initial threshold be set to identical, also difference to some extent; Simultaneously, frame (subframe) number K=0 before beginning, reception one frame (subframe) data need be set,

Step 12 receives next frame data K=K+1,

Step 13, at first utilize the midamble in the TS0 time slot partly to carry out channel estimating, can specify the multipath parameter by path trace device or path-searcher during concrete enforcement, and employing is relevant or the method for fast Fourier transform (FFT), can utilize the technology of over-sampling further to improve the performance of whole invention simultaneously; To carry out reprocessing to the result of channel estimating then, when specifically implementing desirable first footpath, prominent some footpaths or adopt maximum diameter and (or) noise is provided with thresholding and obtains final channel estimation value etc.

Step 14 utilizes above-mentioned impulse response of obtaining the footpath that SYNC-DL is partly carried out the phase place rotation and multipath information merges, thereby draws the estimated value r ' of SYNC-DL part _n, can adopt high specific merging, equal gain combining etc. when specifically implementing.

Step 15 utilizes the SYNC-DL information after merging to carry out the estimation of phase modulation, can adopt the algorithm of formula (1) to obtain a phase modulation correlated series t when specifically implementing earlier _n,

$t_n=c_n^{*}\×r_n^{\′}---\left(1\right)$

N=1 wherein, 2 ... 64, r ' _nBe the estimated value of receiving terminal SYNC-DL part,

Be SYNC-DL part original series, and get altogether and grip without phase modulated.Because t _nBe that a length is 64 sequence, thereby must obtain the estimated value of a single S YNC-DL chopping phase place value, can adopt the method for soft-decision or hard decision when specifically implementing, a kind of soft decision method shown in the formula (2) for example,

$S_k=\underset{n=1}{\overset{64}{\mathrm{\Σ}}}{t}_n/\left|\underset{n=1}{\overset{64}{\mathrm{\Σ}}}{t}_n\right|---\left(2\right)$

Wherein, symbol " | .| " expression is asked the computing of mould value to what a plural number carried out.

Does step 16 judge that frame number is greater than 3? if be not more than 3, return execution in step 12; If frame number is greater than 3, then execution in step 17,

Step 17, the purpose of this step are to prepare for the dynamic threshold adjustment of the judgement of step 18 and step 21, and its implementation can be various, as long as can reflect the similarity degree that detects four phase places and set four phasetophases.For example, can calculate nearest 4 frames (subframe) (being K-3, K-2, four successive frames of K-1, K) estimated value of SYNC-DL phase modulation and the similarity degree Ds1 (K-3) between S1 and S2 and Ds2 (K-3) adopt 2 norm distances square.According to the information of table 1, can S1 and S2 is as follows with complex representation:

$S1=\frac{1}{\sqrt{2}}\{-1+j,1+j,-1-j,-1+j\}---\left(3\right)$

$\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="S04189030020041220E000011.png"\; state="\{\{state\}\}">S</figure-callout>}2=\frac{1}{\sqrt{2}}\{1-j,-1-j,1-j,1+j\}---\left(4\right)$

Utilize formula (5) and formula (6) to obtain Ds1 (K-3) and Ds2 (K-3) respectively:

$\mathrm{Ds}1(K-3)=\underset{i=1}{\overset{4}{\mathrm{\&Sigma;}}}{|S_{K-4+i}-S1\left(i\right)|}^2---\left(5\right)$

$\mathrm{Ds}2(K-3)=\underset{i=1}{\overset{4}{\mathrm{\&Sigma;}}}{|S_{K-4+i}-S2\left(i\right)|}^2---\left(6\right)$

Wherein, S _K-4+iI=1,2,3,4, the chopping phase place value of representing K-3, K-2, K-1, four frames of K respectively, four frames contained BCCH information after S1 indicated, S2 indicates back four frames and do not contain BCCH information, and the phase modulation and back four frames of Ds2 (K-3) expression K-3, K-2, K-1, four frames of K do not contain the similarity degree of the S2 of BCCH information.

Step 18 for the LCR mobile communication system, utilizes N thresholding that Ds1 (K-3) is adjudicated, and whether wherein N equals K and adds 1 again divided by 4 remainder, promptly adjudicate inequality (7) and set up:

Ds1(K-3)＜Threshold(Kmod(4)+1) (7)

In fact, four initial values of threshold T hreshold (i) (i=1,2,3,4) are very important, and under the prerequisite of method shown in the step 17, the value of four initial threshold can be a certain value in the interval (2.5,4.5), for example 3.5.

Step 19 if judgement inequality (7) is set up, is then thought and has been found the S1 phase pattern, according to normalized definition, will have the BCCH data at the TS0 time slot of next frame (subframe).

Does step 20 judge that (K-3) is 4 multiple? if 4 multiple, execution in step 21; Otherwise return step 12 and receive next frame data K=K+1,

Step 21, for the LCR mobile communication system, when K-3 is 4 multiple, the value of having utilized Ds2 (K-6) to regulate the 1st to 4 thresholding respectively to the information of Ds2 (K-3), wherein, the phase modulation of Ds2 (K-6) expression K-6, K-5, K-4, four frames of K-3 and back four frames do not contain the similarity degree of the S2 of BCCH information.This step is one of key of the present invention.During concrete enforcement multiple implementation can be arranged.For example in the LCR mobile communication system:

Implementation one be with Ds2 (K-6) to Ds2 (K-3) respectively with a fixed value relatively, regulate corresponding thresholding according to magnitude relationship separately, as described in formula (8), wherein Threshold is a threshold value, for example 3.5; α is an adjusted value, for example 0.3.

(i＝1，2，3，4)

Implementation two is for seeking the position of the minimum value of Ds2 (K-6) to the Ds2 (K-3), and only will increase with the corresponding thresholding in minimum value position, and other thresholding is reduced.

Implementation three is regulated corresponding thresholding for utilizing the described IIR filter of formula (9), wherein λ (i) is the forgetting factor of IIR filter, for simplified embodiment, λ (i) all is taken as identical fixed value generally speaking, and for example 0.1 or 0.2 or the like.

Threshold(i)＝(1+λ(K+i-7))*Threshold(i)-λ(K+i-7)·Ds2(K+i-7) (9)

(i＝1，2，3，4)

In addition, span that can also restricted T hreshold (i) in the middle of implementation process for example can be limited in Threshold (i) interval of (2.0,5.0).

For all embodiments, whether the position that four phase places that can also be relatively more similar to S2 occur exists periodically, so that the decision thresholding is adjusted scheme.

Embodiment two

Here introduce another kind of another embodiment that in the LCR mobile communication system, obtains broadcast information position.

For the LCR mobile communication system, basic identical in step 11-16 and the above preferred embodiment one, just in step 11, four threshold values of initialization are a certain value in interval (0.0,4.0), for example, 2.0, with in step 15, calculate the phase modulation of gained and estimate not carry out normalized, but directly by formula calculate (10):

$S_k=\underset{n=1}{\overset{64}{\mathrm{\&Sigma;}}}{t}_n---\left(10\right)$

In the step 17, detect four phase places and adopt the method for relevant (correlation) to obtain, promptly calculate correlation P between nearest continuous four detected phase and S1 and the S2 respectively by following formula (11) and (12) with the similarity degree of pre-set four phasetophases _S1(K-3) and P _S2(K-3):

$P_{S1}(K-3)=\underset{i=1}{\overset{4}{\mathrm{\&Sigma;}}}{S}_{K-4+i}\&CenterDot;{\left(S1\left(i\right)\right)}^{*}---\left(11\right)$

$P_{S2}(K-3)=\underset{i=1}{\overset{4}{\mathrm{\&Sigma;}}}{S}_{K-4+i}\&CenterDot;{\left(S2\left(i\right)\right)}^{*}---\left(12\right)$

Then, utilize formula (13), calculate the performance number and the P of continuous four detected phase recently _Avg(K-3):

$P_{\mathrm{avg}}(K-3)=\underset{i=1}{\overset{4}{\mathrm{\&Sigma;}}}{\left|S_{k-4+i}\right|}^2---\left(13\right)$

And respectively by following formula (14) and (15), with P _S1(K-3) and P _S2(K-3) press P _Avg(K-3) carry out obtaining two variable P in addition after the normalized _{S1, norm}(K-3) and P _{S2, norm}(K-3):

$P_{S1,\mathrm{norm}}(K-3)=\frac{{\left|P_{S1}(K-3)\right|}^2}{P_{\mathrm{avg}}(K-3)}---\left(14\right)$

${\mathrm{<figure-callout\; id="2"\; label="P\; S"\; filenames="S04189030020041220E000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_S(K-3)=\frac{{\left|P_{S2}(K-3)\right|}^2}{P_{\mathrm{avg}}(K-3)}---\left(15\right)$

Simultaneously, by following formula (16), calculate judgment variables D at S1 _S1(K-3):

$D_{S1}(K-3)=P_{S1,\mathrm{norm}}(K-3)\&CenterDot;\cos \left(\arg \left(P_{S1}(K-3)\right)\right)$

$=P_{S1,\mathrm{norm}}(K-3)\&CenterDot;\frac{\mathrm{Re}\left\{P_{S1}(K-3)\right\}}{\left|P_{S1}(K-3)\right|}---\left(16\right)$

Wherein, function arg (.) expression is extracted phase operation to a plural number, the computing of function cos (.) expression complementation string, and function R e (.) expression is got real part operation, P to a plural number _Avg(K-3) performance number of expression K-3, K-2, K-1, four detected phase of K and, P _{S1, norm}(K-3) represent that the correlation of the phase modulation of K-3, K-2, K-1, four frames of K and the S1 that back four frames contain BCCH information is through the value after the normalization, P _{S2, norm}(K-3) represent that the correlation of the phase modulation of K-3, K-2, K-1, four frames of K and the S2 that back four frames do not contain BCCH information is through the value after the normalization.

And at the judgment variables D of S2 _S2(K-3) can directly be taken as P _{S2, norm}(K-3); Perhaps, also can with D _S1(K-3) calculate by following formula (17) similarly:

$D_{S2}(K-3)={\mathrm{<figure-callout\; id="2"\; label="P\; S"\; filenames="S04189030020041220E000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_S(K-3)\&CenterDot;\cos \left(\arg \left(P_{S2}(K-3)\right)\right)$

$={\mathrm{<figure-callout\; id="2"\; label="P\; S"\; filenames="S04189030020041220E000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_S(K-3)\&CenterDot;\frac{\mathrm{Re}\left\{P_{S2}(K-3)\right\}}{\left|P_{S2}(K-3)\right|}---\left(17\right)$

Step 18, judge and whether set up with lower inequality (18):

D _S1(K-3)＞Threshold(Kmod(4)+1) (18)

Wherein, the real number that the value of four initial value threshold values of threshold T hreshold (i) (i=1,2,3,4) should be between [0.0,4.0] here, the value of recommendation is for all being made as 2.0.

Step 19 if judgement inequality (18) is set up, is then thought and has been found the S1 phase pattern, according to normalized definition, will have the BCCH data at the TS0 time slot of next frame (subframe).

Step 20 is identical with above-mentioned enforcement one.

Step 21 is utilized P _{S2, norm}(K-6) to P _{S2, norm}(K-3) information is regulated the value of the 1st to 4 thresholding respectively.For example, (19) and (20) carry out the renewal of threshold value as follows:

S2_pattern(i)＝(1-λ(K+i-7))*S2_pattern(i)+λ(K+i-7)*D _S2(K+i-7) (19)

Threshold(i)＝C-S2_pattern(i) (20)

(i＝1，2，3，4)

Wherein, S2_pattern (i) is an accumulated value, and i=1,2,3,4 by formula is the P on the subframe of (K+i-7) with corresponding subframe numbers _{S2, norm}(K+i-7) carry out The disposal of gentle filter, λ is that a value is a real number between [0.0,1.0], expression smothing filtering coefficient.

Wherein, the value of forgetting factor λ (K+i-7) is a real number between [0.0,1.0], recommends value all to be taken as 0.90 for all λ (K+i-7); The initial value of recommendation of array { S2_pattern (i) } (i=1,2,3,4) is for all being taken as 2.0 (that is the initial value of corresponding threshold T hreshold (i) also is 2.0); Constant C in the formula (18) then is used to carry out the conversion between S2_pattern (i) and the thresholding Threshold (i), and the recommendation value is C=4.0.

By enforcement of the present invention, terminal equipment UE can obtain the position of BCCH in the short period of time exactly in the LCR mobile communication system when carrying out Cell searching.

Claims (18)

1. a time division duplex hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, comprises the steps:

S11 ', four threshold values of initialization and make frame number K=0,

S12 ', reception next frame data, K=K+1,

S13 ', utilize midamble to carry out channel estimating, article one path of the estimating window of winning the confidence, prominent some footpaths and/or set noise gate and obtain channel estimation value,

S14 ', utilization are obtained the impulse response in footpath SYNC-DL are partly carried out phase place rotation and the merging of multipath information, thereby draw the estimated value r ' of SYNC-DL part _n,

SYNC-DL information after S15 ', utilization merge is carried out the estimation of phase modulation,

S16 ', whether judge frame number,, just return and carry out S12 ' if be not more than 3 greater than 3; If frame number greater than 3, is then carried out S17 ',

The phase modulation of S17 ', calculating K-3, K-2, K-1, four frames of K respectively and the similarity degree between S1, the S2, wherein S1 indicates back four frames and contains BCCH information, S2 indicates back four frames and does not contain BCCH information,

Wherein the phase modulation of calculating K-3, K-2, K-1, four frames of K and the similarity degree Ds1 (K-3) between aforementioned S1 and S2 and Ds2 (K-3) adopt 2 norm distances square:

Wherein, S _K-4+iI=1,2,3,4, the chopping phase place value of representing K-3, K-2, K-1, four frames of K respectively, S1 indicates back four frames and contains BCCH information S2 and indicate back four frames and do not contain BCCH information, Ds2 (K-3) expression K-3, K-2, K-1, the phase modulation of four frames of K and the similarity degree of aforementioned S2.

S18 ', judge whether Ds1 (K-3) satisfies the requirement of certain threshold,, just carry out S19 ' if meet the demands; Otherwise, carry out S20 ', wherein, the phase modulation of Ds1 (K-3) expression K-3, K-2, K-1, four frames of K and back four frames contain the similarity degree of the S1 of BCCH information;

S19 ',, the position that obtains the BCCH data block;

Do you S20 ', judge that K-3 is 4 multiple? if not 4 multiple just returns and carries out S12 '; Otherwise, carry out S21 ',

The value of S21 ', the 1st to the 4 four thresholding of dynamic adjustments is returned then and is carried out S12 '.

2. obtain the method for broadcast information position in low code check (TDD-LCR) mobile communication system of time division duplex according to claim 1, it is characterized in that the interval of four threshold values of said S11 ' is arbitrary value in (2.5,4.5).

3. obtain the method for broadcast information position in low code check (TDD-LCR) mobile communication system of time division duplex according to claim 1, it is characterized in that the interval of four threshold values is arbitrary value in (0.0,4.0) among the said S11 '.

4. obtain the method for broadcast information position in low code check (TDD-LCR) mobile communication system of time division duplex according to claim 1, it is characterized in that, channel estimation value among the said S13 ' is meant by path trace device or the specified multipath parameter of path-searcher, and adopts the method for relevant or fast fourier transform to carry out channel estimating.

5. obtain the method for broadcast information position in low code check (TDD-LCR) mobile communication system of time division duplex according to claim 1, it is characterized in that it is to adopt the mode of high specific merging or equal gain combining to obtain SYNC-DL estimated value r ' partly that said S14 ' merges SYNC-DL part multipath information _n

6. according to the method for obtaining broadcast information position in claim 1, low code check (TDD-LCR) mobile communication system of 2 or 5 described time division duplexs, it is characterized in that, said S15 ', it utilizes the SYNC-DL information after merging to carry out phase modulation, and obtains the estimated value of a single S YNC-DL chopping phase place value:

Wherein, phase modulation correlated series

In the formula, n=1,2 ... 64, r ' _nBe the estimated value of receiving terminal SYNC-DL part,

Be gripping altogether without the SYNC-DL part original series of phase modulated; Symbol " | .| " expression is asked the computing of mould value to what a plural number carried out.

7. according to the method for obtaining broadcast information position in claim 1, low code check (TDD-LCR) mobile communication system of 3 or 5 described time division duplexs, it is characterized in that, said S15 ', phase estimation wherein:

Wherein

In the formula, n=1,2 ... 64, r ' _nBe the estimated value of receiving terminal SYNC-DL part, Be gripping altogether without the SYNC-DL part original series of phase modulated.

8. according to the method for obtaining broadcast information position in claim 1 or low code check (TDD-LCR) mobile communication system of 3 described time division duplexs, it is characterized in that, the phase modulation of the calculating K among the said S17 '-3, K-2, K-1, four frames of K replaces with the similarity degree of aforementioned S1, S2 and adopts relevant mode to obtain, and its step comprises:

Correlation between a, nearest continuous four detected phase of calculating and aforementioned S1 and the S2:

B, calculating is the performance number and the P of continuous four detected phase recently _Avg(K-3):

C, carry out normalization:

D, obtain the judgement amount of S1 and S2:

D _S2(K-3)=P _{S2, norm}(K-3) or

Wherein, function arg (.) expression is extracted phase operation to a plural number, the computing of function cos (.) expression complementation string, and function R e (.) expression is got the real part operation to a plural number, four frames contained BCCH information after S1 indicated, S2 indicates back four frames and do not contain BCCH information, S _K-4+i, i=1,2,3,4 represents the chopping phase place value of K-3, K-2, K-1, four frames of K, P respectively _Avg(K-3) performance number of expression K-3, K-2, K-1, four detected phase of K and.

9. obtain the method for broadcast information position in low code check (TDD-LCR) mobile communication system of time division duplex according to claim 1 and 2, it is characterized in that, the requirement whether middle Ds1 of judgement of said S18 ' (K-3) satisfies thresholding is meant that the value of four thresholdings is interval (2.5,4.5) in arbitrary value, satisfy Ds1 (K-3)＜Threshold (Kmod (4)+1), wherein Threshold (K mod (4)+1) is a threshold value.

10. according to the method for obtaining broadcast information position in claim 1 or low code check (TDD-LCR) mobile communication system of 3 described time division duplexs, it is characterized in that, the requirement whether middle Ds1 of judgement of said S18 ' (K-3) satisfies thresholding is meant that the value of four thresholdings is interval (0.0,4.0) in arbitrary value, satisfy Ds1 (K-3)＞Threshold (Kmod (4)+1), wherein Threshold (K mod (4)+1) is a threshold value.

11. time division duplex according to claim 1 and 2 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, the the 1st to the 4 four threshold value of the dynamic adjustments of said S21 ' is the value of having utilized Ds2 (K-6) to regulate the 1st to the 4 four thresholding respectively to the information of Ds2 (K-3), wherein Ds2 (K-6) represents K-6, K-5, K-4, the phase modulation of four frames of K-3 and back four frames do not contain the similarity degree of the S2 of BCCH information, and Ds2 (K-3) represents K-3, K-2, the phase modulation of K-1 and four frames of K and back four frames do not contain the similarity degree of the S2 of BCCH information.

12. time division duplex according to claim 11 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, with Ds2 (K-6) to Ds2 (K-3) respectively with fixed value relatively, regulate respective threshold according to magnitude relationship separately.

13. time division duplex according to claim 11 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that said thresholding is adjusted to

Wherein Threshold is a threshold value, as 3.5 or 2.0; α is an adjusted value, as 0.3 and-0.3.

14. time division duplex according to claim 11 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, the value of utilizing Ds2 (K-6) to regulate the 1st to 4 four thresholding respectively to the information of Ds2 (K-3) among the said S21 ' is to Ds2 (K-3) searching and the most similar position of S2 four phase places by Ds2 (K-6), and only will relax to the corresponding threshold requirement in the most similar position, and other threshold requirement is strengthened, wherein, four frames did not contain BCCH information after S2 indicated.

15. time division duplex according to claim 11 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, the value of utilizing Ds2 (K-6) to regulate the 1st to 4 four thresholding respectively to the information of Ds2 (K-3) among the said S21 ' is to regulate corresponding thresholding by IIR filter, promptly

Threshold(i)＝(1+λ(K+i-7))*Threshold(i)-λ(K+i-7)·Ds2(K+i-7)

λ in the formula (i) is the forgetting factor of IIR filter.

16. time division duplex according to claim 15 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, the forgetting factor λ (i) of said IIR filter all gets identical fixed value, 0.1 or 0.2.

17. time division duplex according to claim 16 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, threshold T hreshold (i) is limited in the interval of (2.0,5.0).

18. time division duplex according to claim 8 hangs down the method for obtaining broadcast information position in code check (TDD-LCR) mobile communication system, it is characterized in that, the 1st to the 4 four threshold value of the dynamic adjustments of said S21 ' is to utilize P _{S2, norm}(K-6) to P _{S2, norm}(K-3) information is regulated the value of the 1st to the 4 four thresholding respectively, wherein, and P _{S2, norm}(K-6) represent that the correlation of the phase modulation of K-6, K-5, K-4, four frames of K-3 and the S2 that back four frames do not contain BCCH information is through the value after the normalization.

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