CN104244395B - The decision method and decision system of WCDMA cell searching frame synchronization - Google Patents
The decision method and decision system of WCDMA cell searching frame synchronization Download PDFInfo
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Abstract
The present invention provides the decision methods and decision system of a kind of WCDMA cell searching frame synchronization, wherein the decision method of the WCDMA cell searching frame synchronization includes: that the size of one vector C, the vector C of offer is 15*16, and the value in the vector C is zero；The data for receiving multiple time slots, the data of each time slot are done to 16 SSC code words related, and are stored in obtained correlation is cumulative in the vector C；The correlation in the vector C is merged according to the following formula:Determine the scrambling code group number and frame header position where cell according to the following formula: wherein, X is the main scrambling code group number of the cell to (X, Y)=index (max (R (x, y))), and Y is the frame header position of the cell.The decision method and decision system of the WCDMA cell searching frame synchronization provided through the invention reduce time and data required for frame synchronization is adjudicated.
Description
Technical field
The present invention relates to wireless communication technology field, in particular to a kind of decision method of WCDMA cell searching frame synchronization
And decision system.
Background technique
WCDMA(wideband code division multiple access, Wideband Code Division Multiple Access) system need it is logical
It is synchronous with base station to cross the realization of three step cell searchings: the first step realizes slot synchronization, has been assisted by primary synchronization channel (P-SCH)
At the determining time slot head for receiving signal；Second step realizes frame synchronization, assists completing by auxiliary synchronization channel (S-SCH), determines and receive
Scrambling code group number where the main scrambling code that the frame head and cell of signal use；Third step realizes pilot synchronization, by primary pilot channel (P-
CPICH) auxiliary is completed, and determines the main scrambling code number of cell；Cell is read finally by Primary Common Control Physical Channel (P-CCPCH)
System message.
Traditional frame synchronizing process are as follows: firstly, by the reception data of 15 time slots of a frame respectively with 16 possible SSC codes
Correlation is done, 15 × 16 correlations (for the confidence level for improving judgement, multiframe merging can be carried out) is obtained；Then, it is assisted according to 3GPP
64 × 15 code table merging correlation (as shown in table 1 below) for discussing and deciding justice, obtains 64 × 15 correlations；Finally, finding maximum
It is worth position, that is, can determine the scrambling code group number and frame header position where the cell.
1 secondary synchronization code allocation table of table
The generation and frame synchronizing process of the frame structure, secondary synchronization code of auxiliary synchronization channel is described in detail below:
1, the frame structure of auxiliary synchronization channel
Include secondary synchronization code (SSC) in S-SCH, occupy preceding 256 chips in each time slot (totally 2560 chips),
A frame of S-SCH is made of the coded sequence of 15 2560 chips, these coded sequences have mapped scrambling code group belonging to cell,
And repeat to send using frame as the period, channel architecture is as shown in Figure 1.
When being actually wirelessly transferred, primary synchronization channel and auxiliary synchronization channel are superimposed and are transmitted, i.e.,
SSC and PSC is code division multiplexing on preceding 256 chip positions in each time slot, as shown in Figure 2.Wherein acpIndicate PSC,Indicate SSC, i=0,1,2 ... 63 be scrambling code group group number, and k=0,1,2 ... 14 is timeslot number.SSC shares 16 kinds of code words, often
The S-SCH of one frame (15 time slots) selects a kind of combination according to secondary synchronization code allocation table from 16 kinds of SSC codes, shares 64 kinds
Combination.It is all different from other 63 groups after each combination cyclic shift.It therefore, can be true by the coded sequence of S-SCH
While determining the scrambling code group of cell, frame header position can also be obtained.
2, the generation of secondary synchronization code
16 secondary synchronization code sequence Csssc,1,Cssc,2,...,Cssc,16It is 16 sequence of complex numbers with identical real and imaginary parts,
It is to be obtained after being multiplied with z sequence by step-by-step by Hadamard sequences.
Z sequence definition are as follows:
Z=< b, b, b ,-b, b, b ,-b ,-b, b ,-b, b ,-b ,-b ,-b ,-b ,-b > (1.1)
Wherein:
B=< x1,x2,x3,x4,x5,x6,x7,x8,-x9,-x10,-x11,-x12,-x13,-x14,-x15,-x16>
< x1,x2,...,x161,1,1,1,1,1, -1, -1,1, -1,1, -1,1, -1, -1,1 > of >=<
Hadamard sequences be by the first trip 0 of hadamard matrix H8, every 16 row selects a sequence, the Kazakhstan of serial number m
H is expressed as up to horse sequencem。HkIt is 2kRank hadamard matrix:
H0=(1)
K-th of secondary synchronization code can indicate are as follows:
Cssc,k=(1+j) × < hm(0)×z(0),hm(1)×z(1),...,hm(255) × z (255) > (1.3)
Wherein, k=1,2 ..., 16, m=16 × (k-1).
3, frame synchronizing process
Firstly, the reception data of 15 time slots of a frame are done to 16 possible SSC codes respectively related, 15 × 16 are obtained
Correlation (the application illustrates by taking non-coherent fashion as an example):
Wherein, l is related frame number；M is timeslot number, and value range is 0~14；K is SSC code number, value range 1
~16.
For the confidence level for improving judgement, multiframe merging can be carried out:
Wherein, length is cumulative frame number.
Then, correlation is merged according to 64 × 15 code table (table 1) of 3GPP protocol definition, obtains 64 × 15 correlations
Value.Assuming that A (x) (j) is matrix element represented in table 1, the group number where wherein x is indicated, value range is 0~63；J table
Show time slot position, value range is 0~14；So, the phase closed for the frame header position of xth group in the SSC code character of y-th
Pass value are as follows:
Finally, maximizing position, that is, can determine the scrambling code group number and frame header position where the cell:
(X, Y)=index (max (R (x, y))) (1.7)
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell.
Wherein, frame synchronizing process can be found in Fig. 3.
The decision method, which understands, to be easy, realize it is simple, but have the shortcomings that one it is obvious, it may be assumed that adjudicated each time with frame
To handle unit (data at least needing 1 frame), the so many time may not be needed when channel circumstance is relatively good
And data.
Summary of the invention
The purpose of the present invention is to provide the decision methods and decision system of a kind of WCDMA cell searching frame synchronization, with solution
Time required for certainly existing frame synchronization is adjudicated and the more problem of data.
In order to solve the above technical problems, the present invention provides a kind of decision method of WCDMA cell searching frame synchronization, it is described
The decision method of WCDMA cell searching frame synchronization includes:
The size for providing vector a C, the vector C is 15*16, and the value in the vector C is zero；
The data of each time slot are done correlation that is related, and will obtaining to 16 SSC code words by the data for receiving multiple time slots
Value is cumulative to be stored in the vector C；
The correlation in the vector C is merged according to the following formula:
The scrambling code group number and frame header position where cell are determined according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell.
Optionally, in the decision method of the WCDMA cell searching frame synchronization, the data of 3~24 time slots are received.
Optionally, in the decision method of the WCDMA cell searching frame synchronization, the data of 24 time slots are received.
Optionally, in the decision method of the WCDMA cell searching frame synchronization, the phase that will obtain by the following method
Pass value is cumulative to be stored in the vector C:
Step 1: setting and receive time slot index nssc, receive time slot and index nsscInitial value be 0；
Step 2: the correlation of a time slot being added up and is stored in element (16n in vector Cssc) %240 to element (16nssc+
15) %240, and update nssc=nssc+1；
Step 3: repeating step 2 until the cumulative storage of the correlation of received multiple time slots is finished.
The present invention also provides a kind of decision system of WCDMA cell searching frame synchronization, the WCDMA cell searching frame synchronization
Decision system include:
Correlation obtains module, and it is 15* that the correlation, which obtains size of the module to provide vector a C, the vector C,
Value in 16, the vector C is zero；The data of each time slot and 16 SSC code words are done phase by the data for receiving multiple time slots
It closes, and obtained correlation is added up and is stored in the vector C；
Correlation merging module, the correlation merging module is according to the following formula to close the correlation in the vector C
And:
Judging module, the judging module is to the scrambling code group number and frame header position where determining cell according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell.
Optionally, in the decision system of the WCDMA cell searching frame synchronization, the correlation obtains module and receives
The data of 3~24 time slots.
Optionally, in the decision system of the WCDMA cell searching frame synchronization, the correlation obtains module and receives
The data of 24 time slots.
Optionally, in the decision system of the WCDMA cell searching frame synchronization, the correlation obtains module and passes through
Following method, which adds up obtained correlation, to be stored in the vector C:
Step 1: setting and receive time slot index nssc, receive time slot and index nsscInitial value be 0；
Step 2: the correlation of a time slot being added up and is stored in element (16n in vector Cssc) %240 to element (16nssc+
15) %240, and update nssc=nssc+1；
Step 3: repeating step 2 until the cumulative storage of the correlation of received multiple time slots is finished.
In the decision method of WCDMA cell searching frame synchronization provided by the invention and decision system, sentence different from tradition
Certainly in mode with frame be processing unit, generation with time slot be processing unit, thus adjudicate mode it is more flexible, reduce frame synchronization sentence
Certainly required time and data.
Detailed description of the invention
Fig. 1 is S-SCH frame structure schematic diagram；
Fig. 2 is synchronous channel structure schematic diagram；
Fig. 3 is frame synchronizing process schematic diagram；
Fig. 4 is the flow diagram of the decision method of the WCDMA cell searching frame synchronization of the embodiment of the present invention；
Fig. 5 is the mount structure schematic diagram of the decision system of the WCDMA cell searching frame synchronization of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to the decision method of WCDMA cell searching frame synchronization proposed by the present invention and
Decision system is described in further detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.
It should be noted that attached drawing is all made of very simplified form and using non-accurate ratio, only conveniently, lucidly to assist
Illustrate the purpose of the embodiment of the present invention.
The core concept of the application is, will in traditional judgement mode be processing unit with frame, generation is processing with time slot
Unit, thus judgement mode is more flexible, reduces time and data required for frame synchronization is adjudicated.
Specifically, referring to FIG. 4, it is the stream of the decision method of the WCDMA cell searching frame synchronization of the embodiment of the present invention
Journey schematic diagram.As shown in figure 4, the decision method of the WCDMA cell searching frame synchronization includes:
Step S40: the size for providing vector a C, the vector C is 15*16, and the value in the vector C is zero；
Step S41: receiving the data of multiple time slots, the data of each time slot are done to 16 SSC code words it is related, and will
To correlation cumulative be stored in the vector C；
Step S42: the correlation in the vector C is merged according to the following formula:
Step S43: the scrambling code group number and frame header position where cell are determined according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell.
Correspondingly, the present embodiment also provides a kind of decision system of WCDMA cell searching frame synchronization, the WCDMA cell
Search frame synchronization decision system 5 include:
Correlation obtains module 50, and the correlation obtains module to provide a vector C, the size of the vector C and is
Value in 15*16, the vector C is zero；The data for receiving multiple time slots, by the data of each time slot and 16 SSC code words
Correlation is done, and obtained correlation is added up and is stored in the vector C；
Correlation merging module 51, the correlation merging module is to according to the following formula to the correlation in the vector C
Merge:
Judging module 52, the judging module is to the scrambling code group number and frame header position where determining cell according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell.
Specifically, the data of 3~24 time slots are received, it is available according to emulation (such as CCSS is emulated) result: to work as letter
When road quality is preferable, when the number of received time slot is more than or equal to 3, acquired main scrambling code group number and frame header position are just non-
It is often reliable；And when channel quality is excessively poor, when the number of received time slot is 24, it can also guarantee that acquired master disturbs
The correctness of block number and frame header position.Therefore, in the present embodiment, it is preferred that the number for receiving time slot is 3~24.
Wherein, the initial vector C when value in the vector C initially provided, i.e., the described vector C is zero can be by counting as follows
Learning formula is indicated:
C=[c0,1,c0,2,…,c0,16,c1,1,c1,2,…,c1,16,…,c14,1,c14,2,…,c14,16]T
Or C=[(016)T,(016)T…,(016)T]T(1.8)
Wherein, 016Indicate that size is 16 × 1 null vector.
In the present embodiment, the cumulative deposit method for obtained correlation in vector C is mainly in the following way
It is achieved:
It executes step 1: setting and receive time slot index nssc, receive time slot and index nsscInitial value be 0；
It executes step 2: the correlation of a time slot being added up and is stored in element (16n in vector Cssc) %240 is to element
(16nssc+ 15) %240, and update nssc=nssc+1；
It executes step 3: repeating step 2 until the cumulative storage of the correlation of received multiple time slots is finished.
Wherein, described " cumulative storage " refer to when have on element in vector C correlation (when wherein, initial value is zero,
It is believed that having correlation, value zero in vector C on element) when, newly generated correlation mutually adds up with initial value, then will tire out
On the value added element being stored in corresponding vector C.For example, being element c when receiving the 16th time slot0,1,c0,2,…,c0,16
On have receive the 1st time slot caused by correlation, then at this point, first by correlation caused by the 16th time slot and the 1st
Correlation caused by time slot is cumulative；Then, accumulated result is stored in c0,1,c0,2,…,c0,16On, as cumulative storage.
Specifically, can one time slot of every reception, the data of received time slot are done to 16 SSC code words related, and passed through
The above method, which adds up correlation, is stored in vector C and then the next time slot of reception.And before receiving next time slot,
First received timeslot number can be judged, if having reached preset reception timeslot number N, if having reached, stopping is connect
It receives；If having not yet been reached, continue to and done to 16 SSC code words it is related, by obtained correlation it is cumulative be stored in it is described to
It measures in C.
The time slot for having received preset number and by resulting correlation it is cumulative be stored in vector C after, then
The merging of correlation can be carried out according to the following formula:
Wherein,A(x,(t+y)%15)Matrix equivalent in meaning with the A (x) ((y+m) mod15) in formula 1.6, in expression table 1
Element.
The obtained correlation of multiple time slots can will be received according to formula 1.9 to be merged.
It, then can according to the following formula (namely formula 1.7) after correlation merges completion:
(X, Y)=index (max (R (x, y)))
It makes decisions, so that it is determined that scrambling code group number and frame header position where cell.
By decision method and the decision system of above-mentioned WCDMA cell searching frame synchronization it is found that WCDMA provided by the present application
The decision method and decision system of cell searching frame synchronization at least can be used 3 time slots can determine scrambling code group number where cell and
Frame header position.Scrambling code group number where at least needing just to can determine that cell with a frame (i.e. 15 time slots) in compared with the existing technology
And frame header position, the decision method and decision system of WCDMA cell searching frame synchronization provided by the present application reduce frame synchronization and sentence
Certainly required time and data.In addition, even if in order to maximumlly guarantee the scrambling code group number and frame where identified cell
The correctness of head position is needed using 24 time slots, compared with the existing technology in for the scrambling code where cell determined by guaranteeing
The correctness of group number and frame header position needs equally to reduce time and data required for frame synchronization is adjudicated using multiframe.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (4)
1. a kind of decision method of WCDMA cell searching frame synchronization characterized by comprising
The size for providing vector a C, the vector C is 15*16, and the value in the vector C is zero；
The data for receiving multiple time slots, the data of each time slot are done to 16 SSC code words related, and obtained correlation are tired out
Add and is stored in the vector C；
The correlation in the vector C is merged according to the following formula:
Wherein, the group number where x is indicated, y is cell
Frame header position corresponding to time slot position, t is temporary variable, A representing matrix element；
The scrambling code group number and frame header position where cell are determined according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell；
Obtained correlation is added up by the following method and is stored in the vector C:
Step 1: setting and receive time slot index nssc, receive time slot and index nsscInitial value be 0；
Step 2: the correlation of a time slot being added up and is stored in element (16n in vector Cssc) %240 to element (16nssc+
15) %240, and update nssc=nssc+1；
Step 3: repeating step 2 until the cumulative storage of the correlation of received multiple time slots is finished；
Wherein, the data of 3~14 or 16~24 time slots are received.
2. the decision method of WCDMA cell searching frame synchronization as described in claim 1, which is characterized in that receive 24 time slots
Data.
3. a kind of decision system of WCDMA cell searching frame synchronization characterized by comprising
Correlation obtains module, and it is 15*16 that the correlation, which obtains size of the module to provide vector a C, the vector C,
Value in the vector C is zero；The data for receiving multiple time slots, the data of each time slot are done to 16 SSC code words it is related,
And obtained correlation is added up and is stored in the vector C；
Correlation merging module, the correlation merging module is according to the following formula to merge the correlation in the vector C:
Wherein, the group number where x is indicated, y is cell
Frame header position corresponding to time slot position, t is temporary variable, A representing matrix element；
Judging module, the judging module is to the scrambling code group number and frame header position where determining cell according to the following formula:
(X, Y)=index (max (R (x, y)))
Wherein, X is the main scrambling code group number of the cell, and Y is the frame header position of the cell；
The correlation acquisition module, which by the following method adds up obtained correlation, to be stored in the vector C:
Step 1: setting and receive time slot index nssc, receive time slot and index nsscInitial value be 0；
Step 2: the correlation of a time slot being added up and is stored in element (16n in vector Cssc) %240 to element (16nssc+
15) %240, and update nssc=nssc+1；
Step 3: repeating step 2 until the cumulative storage of the correlation of received multiple time slots is finished；
Wherein, the correlation obtains the data that module receives 3~14 or 16~24 time slots.
4. the decision system of WCDMA cell searching frame synchronization as claimed in claim 3, which is characterized in that the correlation obtains
Modulus block receives the data of 24 time slots.
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| CN106851704B (en) * | 2017-02-16 | 2021-02-09 | 上海白虹软件科技股份有限公司 | Method for WCDMA system to carry out multi-cell tracking scheduling |
| CN108574548B (en) * | 2017-03-13 | 2019-09-17 | 电信科学技术研究院 | A kind of small region search method and UE |
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| CN101499843A (en) * | 2008-01-30 | 2009-08-05 | 京信通信系统（中国）有限公司 | Common frequency multi-cell downlink synchronization method applied to WCDMA system |
| CN101924577A (en) * | 2010-09-02 | 2010-12-22 | 上海交通大学 | Time slot synchronization method for resisting sampling clock frequency deviation in WCDMA (Wideband Code Division Multiple Access) system |
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| CN101499843A (en) * | 2008-01-30 | 2009-08-05 | 京信通信系统（中国）有限公司 | Common frequency multi-cell downlink synchronization method applied to WCDMA system |
| CN101924577A (en) * | 2010-09-02 | 2010-12-22 | 上海交通大学 | Time slot synchronization method for resisting sampling clock frequency deviation in WCDMA (Wideband Code Division Multiple Access) system |
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