CN101175334A - Synchronizing signal position checking method and subdistrict searching method using the same - Google Patents

Synchronizing signal position checking method and subdistrict searching method using the same Download PDF

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CN101175334A
CN101175334A CNA2007101849260A CN200710184926A CN101175334A CN 101175334 A CN101175334 A CN 101175334A CN A2007101849260 A CNA2007101849260 A CN A2007101849260A CN 200710184926 A CN200710184926 A CN 200710184926A CN 101175334 A CN101175334 A CN 101175334A
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mentioned
signal
zones
index
synchronizing signal
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CN101175334B (en
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李昌宰
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7083—Cell search, e.g. using a three-step approach
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7087—Carrier synchronisation aspects

Abstract

The invention relates to a detecting method of a synchronous signal position and the small area search method adopting the detecting method. According to the invention, the position of the prearranged area containing the part of the synchronous signal in the whole subframe is obtained, with small area search only to the part to reduce the relevancy operation quantity to large extent.

Description

Synchronizing signal position detection method and utilize the small region search method of this detection method
Technical field
The present invention relates to wireless communication technology, particularly synchronizing signal position detection method and utilize the small region search method of this detection method.
Background technology
In the TD-SCDMA system, the cell search process of terminating machine can be made of 4 steps as described below, by these 4 steps, can obtain downlink synchronization code (SYNC_DL), basic midamble code (Basic Midamble code), scrambler (Scrambling code), frame synchronization, BCH information and chip timings (Chip timing) information etc.
Fig. 1 is the flow chart that is used to illustrate whole initial cell search procedure.
At first, in step 1, terminating machine searching downlink link pilot time slot (below abbreviate " DwPTS " as).The downlink synchronization code (SYNC_DL) that uses in the 32 kinds of downlink synchronization codes (SYNC_DL) that the terminating machine utilization is known in advance, the sub-district that searching will be searched for (Cell) is obtained with the timing of DwPTS synchronous.
Then, in step 2, identify scrambler and intermediate code, because the downlink synchronization code (SYNC_DL) of the DwPTS that finds in the step 1 is equivalent to have a code character of 4 basic midamble codes, therefore, terminating machine can adopt trial and error pricing (try and error) to find out the basic midamble code that uses in the sub-district from 4 basic midamble codes.In addition, basic midamble code is relevant with scrambler, therefore can also find out scrambler.
In step 3, it is synchronous to carry out multiframe.That is, terminating machine is found out the MIB of BCH multiframe by the P_CCPCH intermediate code being carried out the QPSK phase modulated of DwPTS.
In step 4,, read the information of playback channels (BCH) at last according to the information that obtains by above-mentioned step 1～3.
In the step 1 of the said process that reference Fig. 1 illustrates, to carrying out the degree of correlation computing between received signal and the whole 32 kinds of downlink synchronization codes (SYNC_DL) during whole subframes, obtain correlation, get maximum wherein, for such computing, the number of occurrence is many and amount of calculation is big.
In the Cell searching algorithm that uses, extract the correlation properties between received signal and 32 the SYNC-DL sign indicating numbers with orthogonality in common terminating machine, detect the SYNC-DL sign indicating number ID of the affiliated base station of current terminal, sense cycle is the subframe border of 5ms.Comprise following method at the algorithm that is used to extract correlation properties: the 5ms data of 1) using correlator to obtain one by one to receive and the prevailing method of the degree of correlation between 32 mutually different SYNC-DL (length=64 chips); 2) above-mentioned 1) in, substitute correlator, utilize the method for FFT; Or the like.
The common feature of this class algorithm is, comprises following formation: measure 5ms and receive whole degrees of correlation between data and 32 the SYNC-DL sign indicating number candidates.That is, there are the following problems; When in the cycle is the subframe of 6400 chip lengths of 5ms, seeking the ID of SYNC-DL sign indicating number of 64 chips and position, need measure the degree of correlation repeatedly to the relevant data of the nothing of 6336 chips.
Summary of the invention
In order to address the above problem, the objective of the invention is to, following method is provided: utilize the characteristic of DwPTS structure, acquisition is used for the Position Approximate of the SYNC-DL signal of search of initial zone, utilize this Position Approximate to carry out Cell searching, thereby reduce unnecessary computing.
In order to reach aforesaid purpose, the synchronizing signal position detection method of an embodiment of the invention, it is characterized in that described synchronizing signal position detection method comprises the step of carrying out following processing: read received signal with predetermined length unit, it is divided into 3 zones; Mean value is obtained in above-mentioned 3 zones respectively; And the difference between the mean value of the mean value of the central portion regional signal in satisfying above-mentioned 3 zones divided and all the other regional signals is when being condition predefined critical value more than, and above-mentioned predetermined length index is partly read in acquisition.
Under this situation, also comprise the step of amplifying above-mentioned received signal before the above-mentioned partiting step, the above-mentioned received signal that reads with above-mentioned predetermined length unit can be the above-mentioned received signal of having amplified.
And above-mentioned amplification procedure comprises the step of carrying out following processing: at continuous subframe, the same index of above-mentioned received signal is multiplied each other each other: and the above-mentioned received signal after multiplying each other taken absolute value.Herein, in the above-mentioned step that multiplies each other, the same index of the real number composition of above-mentioned received signal is multiplied each other each other, obtain in the step at above-mentioned index, satisfy under the situation of above-mentioned condition at above-mentioned real number compositional data, whether the imaginary number compositional data of judging above-mentioned received signal satisfies above-mentioned condition, when above-mentioned imaginary number compositional data also satisfies above-mentioned condition, can obtain above-mentioned index.
And, the present invention also comprises the above-mentioned zone partiting step by carrying out pre-determined number repeatedly and above-mentioned index is obtained the step that index that step obtains is obtained mean value, the length in the central portion zone in above-mentioned 3 zones is the length of above-mentioned synchronizing signal, and all the other regional length can be to be respectively the length that does not comprise the data interval in each subframe in above-mentioned 3 zones.
And above-mentioned predetermined length is 160 chip lengths, and the length in the central portion zone in above-mentioned 3 zones is 64 chip lengths, and all the other the regional length in above-mentioned 3 zones are respectively 48 chip lengths.
On the other hand, the small region search method of another embodiment of the present invention is characterized in that, described small region search method comprises the step of carrying out following processing: read received signal with predetermined length unit, it is divided into 3 zones; Mean value is obtained in above-mentioned 3 zones respectively; Obtain the index of above-mentioned predetermined length part, the difference between the mean value of the central portion regional signal in partly satisfied above-mentioned 3 zones divided of this above-mentioned predetermined length and the mean value of all the other regional signals is the above condition of predefined critical value; And utilize the above-mentioned index that obtains to carry out Cell searching.
Description of drawings
Fig. 1 is the flow chart that is used to illustrate whole initial cell search procedure.
Fig. 2 is the figure of the subframe structure of expression TDD-LCR.
Fig. 3 is the figure that amplifies the zone (A) at SYNC-DL signal place in the subframe structure of representing TDD-LCR shown in Figure 2.
Fig. 4 is the figure of signal waveform that schematically shows the zone at SYNC-DL signal place.
Fig. 5 is the flow chart of method of index in zone that is used to illustrate the acquisition SYNC-DL signal place of an embodiment of the invention.
Embodiment
Below, with reference to accompanying drawing, describe the preferred embodiments of the present invention in detail.Accompanying drawing and be used to illustrate illustrative embodiments of the present invention in the detailed description of following discloses is not represented unique execution mode that the present invention can implement.
In the following detailed description,, comprise the concrete details item for the ease of intactly understanding the present invention.But those skilled in the art should understand, even there are not these concrete details items also can realize among the present invention.In some cases,, known construction and device is omitted, or be the center, adopt the block diagram form to illustrate with the Core Feature of each construction and device for fear of concept obfuscation of the present invention.In addition, in this specification,, use identical Reference numeral, describe for all identical inscapes.
The present invention relates to detect the mode of Position Approximate of the reference signal (SYNC-DL) of the base station that comprises in the subframe of cycle of using among the TD-SCDMA as 5ms.For this reason, as mentioned above, the invention provides following method: farthest reduce in cell search process the actual relevant data of nothing of 6336 chips of SYNC-DL signal that do not exist in the subframe that is generated are carried out degree of correlation computing.
Fig. 2 is the figure of the subframe structure of expression TDD-LCR, and Fig. 3 is the figure that amplifies the zone (A) at SYNC-DL signal place in the subframe structure of representing TDD-LCR shown in Figure 2.
As shown in Figure 2, the subframe among the TDD-LCR comprises down link pilot timeslot (DwPTS), and this DwPTS comprises the SYNC-DL signal.Specifically, as shown in Figure 3, DwPTS has the length of 96 chips, and is made of the SYNC_DL signal of 64 chips and the guard interval of 32 chips.And above-mentioned DwPTS is positioned between the guard interval (GP) and time slot 0 (TS0) of 48 chip lengths, and guard interval (GP) is between DwPTS and UpPTS, time slot 0 with the boundary portion of DwPTS on have about 16 chip lengths guard interval.
In an embodiment of the invention, as mentioned above, only detect the presumptive area that comprises SYNC-DL in the subframe of TDD-LCR, be used to carry out the degree of correlation computing of Cell searching, thereby the computing of 6336 chips part unnecessary in whole 6400 chips can be minimized.For this reason; preferably will be set at 160 chips for detecting the unit length that whether exists the SYNC-DL signal to read in the received signal; this 160 chip is to length 64 chips of SYNC-DL signal and the guard interval length (1/2 length of the guard interval of guard interval 32 chips of DwPTS, guard interval 16 chips of TS0 and DwPTS back i.e. 48 chips) of both sides 48 chips of its encirclement is carried out addition obtain, and will describe in detail below this.
Fig. 4 is the figure of signal waveform that schematically shows the zone at SYNC-DL signal place.
As shown in Figure 4, SYNC-DL signal and the signal waveform between the peripheral guard interval zone of its encirclement be there are differences on mean amplitude of tide.Usually in the guard interval of SYNC-DL, insert by 0 signal that constitutes.
And, in an embodiment of the invention, utilize the mean amplitude of tide between such SYNC-DL signal and its peripheral GP zone poor, detect the Position Approximate of SYNC-DL signal.
The following process of SYNC-DL signal location detection method process according to such an embodiment of the invention: read whole received signal with length-specific unit, judge whether the length part that is read comprises the SYNC-DL signal.Specifically, the length-specific that reads partly is divided into 3 zones, whether the difference between the mean value of the central portion regional signal in 3 zones that judgement is divided and the mean value of all the other regional signals is more than the predefined critical value.When the difference between the signal averaging in central portion zone and periphery zone is critical value when above, be judged as to have the SYNC-DL signal on the corresponding central portion, this index is used in cell search process afterwards.
And; in order to increase the zone that comprises the SYNC-DL signal and the difference between its periphery guard interval; consider and insert in the guard interval by 0 signal that constitutes; the preferred process of amplifying received signal of carrying out; this amplification process can carry out in the following way: with same index signal multiplication each other in the continuous subframes, take absolute value.By such amplification process, can be easier division SYNC-DL part and by 0 guard interval that constitutes.
And, at first the I channel is carried out above-mentioned signal amplification procedure and detected the step of the position in the zone that comprises SYNC-DL by amplifying signal, the Q channel is confirmed the position of thus obtained SYNC-DL signal roughly, thereby can further improve accuracy.
In addition, carry out the such affirmation process of pre-determined number repeatedly, detected value is asked on average, detect error to reduce.
For so of the present invention preferred execution mode, with reference to Fig. 5, following being elaborated.
Fig. 5 is the flow chart of method of index in zone that is used to illustrate the acquisition SYNC-DL signal place of an embodiment of the invention.
At first, in step S501, from base station receiving downlink signal.The signal that receives comprises real number composition and imaginary number composition, also may comprise noise (noise) in by the process of Channel Transmission, therefore, and received signal that can following expression I subframe.
[formula 1]
S k I = ( r k I , real ) + ( r k I , imag ) + noise , Wherein, k=0,1 ... (6400 * osr-1)
Herein, k represents the chip index, and osr represents over-sampling rate.
Then, adopt the signal of an embodiment of the invention to amplify mode, amplify received signal.Specifically, in step S502, the same index of the real number composition of 2 subframes receiving is continuously multiplied each other each other, its result, picked up signal, this process is as follows.
[formula 2]
M k real = r k I , real × r k I + 1 , real + noise , Wherein, k=0,1 ... (6400 * osr-1)
Amplification about received signal, can adopt real number composition and the imaginary number composition of considering received signal simultaneously, same index is multiplied each other each other, with the method for amplifying, but, in the preferred execution mode of the present invention, shown in above-mentioned formula 2, at first only the same index of real number composition with continuous subframe signal multiplied each other each other, carry out the synchronizing signal position procurement process thus, and the whether correct process in the position that affirmation obtained of imaginary number composition after being used for, thereby operand can be minimized.And, among the step S502, the computing that continuous subframe is carried out computing that the same index with the I channel signal multiplies each other each other and the same index of Q channel signal is multiplied each other each other simultaneously, then in the affirmation process, preferably to the same index of Q channel signal each other multiplied signals only carry out the affirmation step, and do not carry out other computings, but, also can be therewith different, after the affirmation process in, carry out the computing of Q channel in addition.
Reason with same index signal multiplication each other in the continuous subframe is like this; different with other intervals of subframe; the base station continues to transmit identical SYNC-DL signal with 4 subframe unit transformation phase places; as mentioned above; on the characteristic of guard interval with " 0 " value; when 2 continuous subframes are multiplied each other same index each other, divide the part at SYNC-DL signal place and other signal areas of periphery easily.
Then, in step S503, to the received signal M that multiplies each other by above-mentioned formula 2 k RealTake absolute value.
[formula 3]
| M k Real|, wherein, k=0,1 ... (6400 * osr-1)
The reason that takes absolute value like this is, for after with length-specific, be that unit length reads received signal, the signal that reads is divided into 3 parts, when comparing the mean value of each regional signal, as shown in Figure 4, the SYNC-DL signal value has "+" value and "-" value, therefore, prevents that by taking absolute value them from offsetting each other.
By the signal amplification process of above-mentioned step S502, S503, divide the guard interval of SYNC-DL signal section and periphery easily to received signal.
Then, carry out following process in an embodiment of the invention: utilize amplifying signal as mentioned above, detect the SYNC-DL signal location.Specifically, in step S504, read with 160 chip units and to obtain among the above-mentioned step S504 | M k Real|.With read received signal length-specific, be that the reason that unit length is made as 160 chips is; as shown in Figure 3; when comprise SYNC-DL signal length 64 chips and with its encirclement by the maximum length of 0 guard interval that constitutes the time, divide SYNC-DL signal section and periphery easily.But; as mentioned above; read received signal with 160 chip units; the mode of confirming the position of SYNC-DL signal only is a preferred execution mode of the present invention; as long as can be more than the SYNC-DL signal length and comprise in the random length of guard interval of predetermined length; divide SYNC-DL signal section and periphery and get final product, can adopt random length to read, confirm the position of synchronizing signal as unit length.
Then, in step S505, the signal that will read with 160 chip units | M k Real| be divided into 3 zones.The division of carrying out when this division is hypothesis guard interval (48 chip)+SYNC-DL signal (64 chip)+guard interval (48 chip) is whether to satisfy the above-mentioned state that comprises the SYNC-DL signal for the unit length part of confirming to read.In step S506, at the signal that is divided into 3 zones is as mentioned above compared each regional mean value, difference between the mean value of mean value that satisfies the central portion regional signal and periphery regional signal is under the situation of the condition more than the predetermined critical, regard the index (being referred to as " k ' ") that reads the original position of corresponding signal as comprise the SYNC-DL signal position, in step S508, confirm that imaginary number with same position becomes sub-signal, promptly | M k Imag| also be divided into 3 when regional, whether the difference between the mean value in the mean value of central portion signal and periphery zone is more than the predetermined critical.
Herein, M k ImagAs follows.
[formula 4]
M k imag = r k I , imag × r k I + 1 , imag + noise , Wherein, k=k ', k '+1 ... k '+(160 * osr-1)
In the above-mentioned formula 4, can confirm | M k Imag| also be to obtain the interval that its index k ' that whether satisfies above-mentioned condition plays 160 chips by the real number composition.
On the other hand, the judged result of step S506, | M k Real| value does not satisfy under the situation of above-mentioned condition, transfers to step S507, moves to after the original position index k that reads with 160 chip units the process of repeating step S504～S506.
Among the above-mentioned steps S508, when the imaginary number composition of relevant position, be that difference between the mean value of the mean value of central portion regional signal and periphery regional signal is when being condition more than the predetermined critical, in step S509, corresponding index is transmitted as the zone that comprises the SYNC-DL signal, to be used for Cell searching.
By the said method of reference Fig. 5 explanation, acquisition comprises the position of 160 chip interval of SYNC-DL signal, uses it for Cell searching, thereby can significantly reduce the operand of the degree of correlation computing of carrying out in the Cell searching.
But, in the preferred execution mode of the present invention, carry out the SYNC-DL signal location of step S504～S509 in the method for Fig. 5 of specific times repeatedly and confirm step, get the mean value outside the maximum and minimum value in the detected instantaneous value SYNC-DL location index, the mean value of the index obtained is judged as the initial value of the position at SYNC-DL signal place in the sub-frame data that receives.Carry out the SYNC-DL signal location like this repeatedly and confirm step, thereby reduce the mistake that produces in the process of confirming the SYNC-DL signal location, obtain correct information.
On the other hand, the small region search method of an embodiment of the invention, as mentioned above, utilize 32 synchronous codes of knowing in advance only to the location confirmation synchronous code of 160 chip interval at SYNC-DL signal place, the acquisition sequential is synchronous, by carrying out the method for Cell searching and compare, can significantly reduce operand with existing to carrying out degree of correlation computing between whole subframe and 32 synchronous codes one by one.
As mentioned above, to the detailed description of preferred implementation of the present invention openly to making those skilled in the art realize implementing.In the above-mentioned explanation, be illustrated with reference to the preferred embodiments of the present invention, but those skilled in the art should be understood that, in the aim of in not breaking away from claims scope, putting down in writing of the present invention and the scope in field, and can be to the various modifications and changes of the invention process.And, the invention is not restricted to execution mode disclosed herein, but include the wide region consistent with principle shown here and new feature.
As mentioned above, according to an embodiment of the invention, provide following method: utilize the characteristic of DwPTS structure, acquisition is used for the approximate location of the SYNC-DL signal of search of initial zone, utilizes this position to carry out Cell searching, to reduce unnecessary computing.
Specifically, used Cell searching algorithm of the present invention and had following effect: SYNC-DL has been minimized with degree of correlation computing between the no relevant 6336 chip data, this means and to reduce Cell searching time and memory span.For example, utilize in the Cell searching algorithm of single subframe, the multiplying number of times from known 13107200 (=6400*64*32) inferiorly reduce to 327680 (=160*64*32) inferior, promptly reduce about 40 times, and, also inferior to reduce to 5120 (160*32) inferior from known 204800 (6400*32) for the add operation number of times, promptly reduces about 40 times.

Claims (8)

1. a synchronizing signal position detection method is characterized in that, described synchronizing signal position detection method comprises the step of carrying out following processing:
Read received signal with predetermined length unit, it is divided into 3 zones;
Mean value is obtained in above-mentioned 3 zones respectively; And
When the mean value of the central portion regional signal in satisfying above-mentioned 3 zones divided and difference between the mean value of all the other regional signals are condition more than the predefined critical value, obtain to read above-mentioned predetermined length index partly.
2. synchronizing signal position detection method according to claim 1, it is characterized in that, also comprised the step of amplifying above-mentioned received signal before above-mentioned partiting step, the above-mentioned received signal that reads with above-mentioned predetermined length unit is the above-mentioned received signal after amplifying.
3. synchronizing signal position detection method according to claim 2 is characterized in that,
Above-mentioned amplification procedure comprises the step of carrying out following processing:
At continuous subframe, the same index of above-mentioned received signal is multiplied each other each other: and
Above-mentioned received signal after multiplying each other is taken absolute value.
4. synchronizing signal position detection method according to claim 3, it is characterized in that, in the above-mentioned step that multiplies each other, the same index of the real number composition of above-mentioned received signal is multiplied each other each other, obtain to satisfy under the situation of above-mentioned condition at above-mentioned real number compositional data in the step at above-mentioned index, judge whether the imaginary number compositional data of above-mentioned received signal satisfies above-mentioned condition, when above-mentioned imaginary number compositional data also satisfies above-mentioned condition, obtain above-mentioned index.
5. according to each the described synchronizing signal position detection method in the claim 1～4, it is characterized in that described synchronizing signal position detection method also comprises the step of the index that obtains to above-mentioned index acquisition step by the above-mentioned zone partiting step that carries out pre-determined number repeatedly being obtained mean value.
6. according to each the described synchronizing signal position detection method in the claim 1～4, it is characterized in that, the length in the central portion zone in above-mentioned 3 zones is the length of above-mentioned synchronizing signal, and all the other regional length are respectively the length that does not comprise the data interval in each subframe in above-mentioned 3 zones.
7. synchronizing signal position detection method according to claim 6, it is characterized in that, above-mentioned predetermined length is 160 chip lengths, and the length in the central portion zone in above-mentioned 3 zones is 64 chip lengths, and all the other the regional length in above-mentioned 3 zones are respectively 48 chip lengths.
8. a small region search method is characterized in that, described small region search method comprises the step of carrying out following processing:
Read received signal with predetermined length unit, it is divided into 3 zones;
Mean value is obtained in above-mentioned 3 zones respectively;
Obtain the index of above-mentioned predetermined length part, wherein, the difference between the mean value of the mean value of the central portion regional signal in partly satisfied above-mentioned 3 zones divided of this above-mentioned predetermined length and all the other regional signals is the above condition of predefined critical value; And
Utilize the above-mentioned index that obtains to carry out Cell searching.
CN2007101849260A 2006-11-01 2007-10-30 Synchronizing signal position checking method and subdistrict searching method using the same Expired - Fee Related CN101175334B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102282893A (en) * 2009-01-15 2011-12-14 瑞典爱立信有限公司 Method and apparatus for cell searching

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CN1131653C (en) 2000-03-27 2003-12-17 信息产业部电信科学技术研究院 Small-region initial search method for CDMA digital mobile communication system
KR100524730B1 (en) 2002-11-02 2005-10-31 엘지전자 주식회사 Early syncrounization search method for mobile communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102282893A (en) * 2009-01-15 2011-12-14 瑞典爱立信有限公司 Method and apparatus for cell searching
US8705440B2 (en) 2009-01-15 2014-04-22 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for cell searching
CN102282893B (en) * 2009-01-15 2014-07-23 瑞典爱立信有限公司 Method and apparatus for cell searching

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