CN100413364C - TD SCDMA terminal and cell searching method under common-frequency network - Google Patents
TD SCDMA terminal and cell searching method under common-frequency network Download PDFInfo
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- CN100413364C CN100413364C CNB2006100935457A CN200610093545A CN100413364C CN 100413364 C CN100413364 C CN 100413364C CN B2006100935457 A CNB2006100935457 A CN B2006100935457A CN 200610093545 A CN200610093545 A CN 200610093545A CN 100413364 C CN100413364 C CN 100413364C
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Abstract
The present invention discloses a TD-SCDMA terminal and a cell searching method thereof under a common-frequency network. A multi-cell selecting module and a multi-cell confirming module are additionally arranged in the TD-SCDMA terminal. The cell searching method comprises the steps: firstly, position synchronization is carried out to the time slot of downlink pilot frequency; then, a multi-cell list is obtained according to the result of the position synchronization; according to the multi-cell list, carrier frequency is adjusted and multi-cell basic training sequence codes/scrambling codes are confirmed; then, a multi-cell list containing the relevant power value of each cell and the corresponding basic training sequence codes/ scrambling codes thereof is confirmed and obtained; finally, according to the relevant power value of each cell and the corresponding basic training sequence codes/ scrambling codes thereof, the carrier frequency is adjusted accurately; the phase of a registering cell is confirmed; the system information of the registering cell is read. Adopting the method of the present invention enhances the success probability of cell registration.
Description
Technical field
The present invention relates to a kind of mobile communication technology, relate in particular to a kind of TD-SCDMA (TimeDivision-Synchronous Code Division Multiple Access, TD SDMA) terminal and the small region search method under common-frequency network thereof.
Background technology
In the actual networking of TD-SCDMA system,, all adopt identical networking usually in order further to improve the capacity of TD-SCDMA system.That is to say that a complete TD-SCDMA grid can move on a single carrier frequency point.In such cases, require the terminal of TD-SCDMA system can support with inserting frequently and demodulation frequently together.
In above-mentioned TD-SCDMA nets with frequency, behind the TD-SCDMA starting up of terminal, need the search procedure of experience initial cell realize with network synchronously, descending synchronous code, the basic training sequences sign indicating number/scrambler that promptly need realize landing the sub-district confirmed, the system information multiframe is synchronous and system information reads, and just can finish successfully persistent district.
As shown in Figure 1, under the common-frequency network, the step of TD-SCDMA terminal searching sub-district comprises as follows:
Said method is the small region search method of single sub-district, after terminal is successfully landed a TD-SCDMA sub-district that is fit to land, according to its system information that comprises co-frequency neighbor cell list that receives, terminal can be arranged a period of time, according to adjacent cell list, one by one each sub-district is measured, and sort according to certain measurement result, for example, according to the received signal code power size order, draw the tabulation of many cell informations.In ensuing downlink data receives, can utilize the many cell informations in this tabulation to use the common frequency multi-cell demodulating algorithm to carry out data demodulates.The demodulating algorithm of this common frequency multi-cell can only use after landing cell system information successfully reading.And can only use the small region search method of single sub-district in the search of initial zone stage, comprise and initially read the cell system information process of landing.
The algorithm of single sub-district can not overcome because the interference that initial cell stage co-frequency cell brings.For example, in the TD-SCDMA system of the common-frequency network that terminal is landed, when terminal searching to land sub-district and adjacent cell power difference when little, owing to reasons such as decline and temporal extension, carry out estimating carrier frequencies and adjust, carrier frequency accurately adjusts, lands the sub-district phase place and determine, read when landing cell system information, in the data that terminal receives, it lands the power of sub-district even also less than the power of co-frequency neighbor cell.If this moment still use the small region search method of the described single sub-district of Fig. 1, just can't overcome the interference that co-frequency neighbor cell brings, thus the minimizing complete successfully the probability of this task, thereby cause landing network failure.
Summary of the invention
The present invention is directed to the shortcoming of prior art, a kind of TD-SCDMA terminal and the small region search method under common-frequency network thereof are provided, frequency adjustment, the phase place that the common frequency multi-cell information that utilize to obtain is landed the sub-district confirmed and the system message of landing the sub-district reads, and improves the probability that terminal is successfully landed network greatly.
Comprise central processing unit and functional module in the TD-SCDMA terminal of the present invention, also increased many cell informations and selected module and many cell informations to confirm module; Wherein,
Many cell selecting module is used for carrying out many cell selecting according to descending pilot frequency time slot position synchronous result, draws the many cell lists that comprise descending synchronous code information and correspondence code power measurement value information;
The TD-SCDMA terminal carries out the carrier frequency adjustment according to the information in above-mentioned many cell lists and many sub-districts basic training sequences sign indicating number/scrambler is confirmed;
Many sub-districts confirm that module is used to confirm the basic training sequences sign indicating number/scrambler of many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler;
The TD-SCDMA terminal confirms that according to many sub-districts the related power value of each sub-district in many cell lists that modules obtain and its corresponding basic training sequences sign indicating number/scrambler carry out carrier frequency and accurately adjust, land the sub-district phase place and confirm and land cell system information and read.
The present invention also provides the small region search method of a kind of TD-SCDMA terminal under common-frequency network, and its step comprises:
Step 1, the TD-SCDMA terminal is carried out the descending pilot frequency time slot position synchronous;
Step 2 is carried out many cell selecting according to above-mentioned descending pilot frequency time slot position synchronous result, obtains comprising many cell lists of descending synchronous code information and correspondence code performance number;
Step 3 is carried out carrier frequency adjustment and many sub-districts basic training sequences sign indicating number/scrambler affirmation according to the information in above-mentioned many cell lists;
Step 4 is confirmed the basic training sequences sign indicating number/scrambler of above-mentioned many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler;
Step 5 is carried out carrier frequency according to the related power value of each sub-district in above-mentioned many cell lists and its corresponding basic training sequences sign indicating number/scrambler and is accurately adjusted, lands the sub-district phase place and confirm and land cell system information and read.
In the above-mentioned steps two, the step of many cell selecting comprises:
Steps A 1 is chosen maximum measured value and the corresponding descending synchronous code of record from the pairing code power measurement value of all community downlink synchronous codes;
Steps A 2, the code power measurement value of all the other community downlink synchronous codes and the difference of above-mentioned sign indicating number power greatest measurement and setting threshold value are compared, choose the respective cell of descending synchronous code code power measurement value, and in many cell lists, write down this descending synchronous code and corresponding sign indicating number power greater than above-mentioned difference;
Steps A 3, according to the size of sign indicating number power to the processing of sorting of above-mentioned many cell lists.
In the above-mentioned steps four, confirm that the basic training sequences sign indicating number/scrambler of above-mentioned many sub-districts comprises:
Step B1, whether the related power of basic training sequences sign indicating number/scrambler of determining each sub-district is greater than the difference of landing a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a thresholding;
Step B2, selecting related power wherein is interfered cell greater than the basic training sequences sign indicating number/scrambler corresponding district of above-mentioned difference;
Step B3 by the related power processing of sorting, obtains many cell lists with the interfered cell of above-mentioned selection.
By obtaining many cell informations, and the system message of utilizing that many cell informations carry out the frequency adjustment, phase place is confirmed and landing the sub-district reads, and overcome the interference of co-frequency neighbor cell, improved the probability that successfully lands the sub-district among the present invention.
Description of drawings
Fig. 1 is the method flow diagram of TD-SCDMA terminal searching sub-district in the prior art;
Fig. 2 is a TD-SCDMA terminal structure schematic diagram of the present invention;
Fig. 3 is the method flow diagram of TD-SCDMA terminal searching of the present invention sub-district;
Fig. 4 carries out the method flow diagram of many cell selecting for TD-SCDMA terminal of the present invention;
Fig. 5 carries out the method flow diagram that many sub-districts are confirmed for TD-SCDMA terminal of the present invention.
Embodiment
Among the present invention, in the TD-SCDMA terminal, increase many cell selecting module and many sub-districts affirmation module, many cell informations that the utilization of TD-SCDMA terminal is obtained carry out that carrier frequency in the cell search process is accurately adjusted, phase place is confirmed and system information reads, thereby improve the probability that the TD-SCDMA terminal is successfully landed the sub-district.
The present invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 2, TD-SCDMA terminal of the present invention comprises that central authorities handle and other functional modules, has also increased many cell selecting module and many sub-districts simultaneously and has confirmed module.
Above-mentioned functional module is used to finish the set-up function of terminal, and for example, functional module can be for finishing the message output module of information output, i.e. display screen; Finish the MIM message input module of information input, i.e. keyboard; And the information storage module of stored information or the like.
Above-mentioned many cell selecting module is used for carrying out many cell selecting according to descending pilot frequency time slot position synchronous result, draws the many cell lists that comprised descending synchronous code information and correspondence code power measurement value information.The rough position that terminal is carried out descending pilot frequency time slot synchronously and the exact position of descending pilot frequency time slot synchronous after, code power measurement value and the relevant position that can export the descending synchronous code of all sub-districts.So, many cell selecting module is chosen maximum measured value and the corresponding descending synchronous code of record from the pairing code power measurement value of all community downlink synchronous codes, code power measurement value and above-mentioned sign indicating number power greatest measurement with all the other community downlink synchronous code correspondences compares with the difference of setting threshold value again, take off the respective cell of the code power measurement value of capable synchronous code greater than above-mentioned difference, and the descending synchronous code of the sub-district that record is chosen in many cell lists and corresponding code power measurement value, then, according to the size of code power measurement value to the processing of sorting of many cell lists.Like this, just obtain the many cell lists that sort according to code power measurement value size, comprised descending synchronous code information and correspondence code power measurement value information in this tabulation.
The TD-SCDMA terminal carries out the carrier frequency adjustment according to the information in above-mentioned many cell lists and many sub-districts basic training sequences sign indicating number/scrambler is confirmed.The TD-SCDMA terminal at first needs to receive one section data that comprise descending synchronous code, use needs the descending synchronous code of search cell and the descending synchronous code of many sub-districts to carry out the carrier frequency offset estimation respectively afterwards, estimated result is carried out the analysis of most possible property, the frequency departure estimated value that correlation is more intense is weighted on average, weights can be determined according to descending synchronous code power measurement values in many cell lists, thereby obtain final exemplary frequency deviation values and control adjustment.This process need carries out repeatedly could satisfying the scope that carrier frequency offset reaches setting, for example, is less than the target of 1kHz.The TD-SCDMA terminal is after the descending pilot frequency time slot exact position is synchronous, just can find the training sequence part data of time slot 0, carry out relevantly with the training sequence data of the time slot 0 that receives respectively with 4 basic training sequences sign indicating number/scramblers of each descending synchronous code correspondence, calculate related power.For search cell, the pairing basic training sequences sign indicating number/scrambler of related power maximum is the basic training sequences sign indicating number/scrambler of search cell correspondence.
Above-mentioned many sub-districts confirm that module is used to confirm the basic training sequences sign indicating number/scrambler of many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler.Many sub-districts confirm that modules determine that whether the related power of basic training sequences sign indicating number/scrambler of each sub-district is greater than the difference of landing a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a thresholding; Selecting related power wherein is interfered cell greater than the basic training sequences sign indicating number/scrambler corresponding district of above-mentioned difference; Many sub-districts of above-mentioned selection by the related power processing of sorting, are obtained many cell lists.
The TD-SCDMA terminal confirms that according to many sub-districts the related power value of each sub-district in many cell lists that modules obtain and its corresponding basic training sequences sign indicating number/scrambler carry out carrier frequency and accurately adjust, land the sub-district phase place and confirm and land cell system information and read.
Carrying out frequency when accurately adjusting, mainly utilizing in the frame structure Primary Common Control Physical Channel data on the time slot 0 to carry out carrier frequency offset and estimate.Detailed process is: at first receive the data of whole time slot 0, time slot 0 is carried out joint-detection.When carrying out the channel estimating of joint-detection, need utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in many cell lists to carry out channel estimating, the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the real channel estimating of search cell and other many sub-districts; Utilize this channel estimating, use zero forcing algorithm, perhaps the maximal possibility estimation algorithm carries out joint-detection, obtains the data of Primary Common Control Physical Channel; Utilizing these data to carry out carrier frequency more accurately adjusts.Because after each the adjustment, carrier deviation all can gradually reduce, therefore, above-mentioned frequency is accurately adjusted needs a plurality of processes just can reach system requirements, such as, the system requirements carrier frequency offset is in 200 hertz.
When landing sub-district phase place affirmation, the data that comprise training sequence code of receiving slot 0 at first, utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in many cell lists to carry out channel estimating, the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the channel estimating after the search cell interference eliminated; Utilize this impulse response and land the used descending synchronous code in sub-district and carry out convolution, the sequence that obtains is compared with the descending synchronous code partial data that comprises that receives, and obtains the phase modulation of the descending synchronous code of this subframe.According to the TD-SCDMA system features, this phase place is exclusively used in indication mechanism information interlacing frames.So obtain to detect the interlacing frames of system information after continuous several phase place.
When landing cell system information and read, according to the interlacing frames of the Primary Common Control Physical Channel of above-mentioned affirmation, for example, 20 milliseconds, 4 TD-SCDMA subframes since the frame head that interweaves, receive the data of the time slot 0 of an interlacing frames.To time slot 0 data of each subframe, carry out the data demodulates of code channel 0 and code channel 1.At first carry out channel estimating, the basic training sequences sign indicating number of sub-district is landed in utilization and the many sub-districts training sequence code in many cell lists carries out, and the original channel that obtains many sub-districts is estimated; This many sub-district original channel is estimated to carry out each other interference eliminated, obtain the real channel impulse response of search cell and other many sub-districts; Then utilize joint detection algorithm, for example adopt zero forcing algorithm or maximum likelihood algorithm to carry out Data Detection, obtain the data of this subframe code channel 0 and code channel 1; The data of 4 subframes are input to the channel decoding unit, obtain the information of this Primary Common Control Physical Channel, promptly land system information of subdistricts.
Among the present invention, confirm module, make terminal can utilize many cell informations of acquisition to carry out Cell searching, thereby improved the probability that terminal is successfully landed the sub-district by in the TD-SCDMA terminal, increasing many cell selecting module and many sub-districts.
The present invention also provides the small region search method of a kind of TD-SCDMA terminal under common-frequency network, as shown in Figure 3, comprises the steps:
Step 201, the TD-SCDMA terminal is carried out the descending pilot frequency time slot position synchronous.
In this step, the TD-SCDMA terminal is carried out the descending pilot frequency time slot position synchronous and is comprised two processes, and the rough position exact position synchronous and descending pilot frequency time slot that is followed successively by descending pilot frequency time slot is synchronous.
In the rough position synchronizing process of descending pilot frequency time slot; by the TD-SCDMA frame characteristics as can be known; the power of protection symbol before and after the descending synchronous code power that descending pilot frequency time slot in each subframe sends is higher than far away; therefore; can utilize the power structure feature of this subframe; a power features window is set, seeks the rough position of descending pilot frequency time slot by the power features window.For example: it is 8 symbols that power features window length is set, and divided by the both sides power sum of totally 4 symbols, can obtain the ratio of this power features window with the power sum of middle 4 symbols.By the whole sub-frame data that receives is carried out same power features window ratio calculation and slip ratio, maximizing in all power features window ratios, the pairing position of this maximum is the rough position of the descending pilot frequency time slot in this subframe.The precision of the rough position of above-mentioned definite descending pilot frequency time slot depends on the power features window when sliding selected interval, short more at interval, determine that the precision of rough position of descending pilot frequency time slot is high more.The rough position of the descending pilot frequency time slot that the employing said method is determined can reach the precision of 1 symbol level.
Descending pilot frequency time slot is carried out on the synchronous basis of rough position above-mentioned, terminal can receive one section data that contain descending synchronous code, and the exact position of descending pilot frequency time slot is based on synchronously that these data carry out.The synchronous process in the exact position of descending pilot frequency time slot is: utilize the data that contain descending synchronous code one by one all descending synchronous codes to be carried out matching treatment, each descending synchronous code and these data are carried out matched filtering and are obtained one group of matched filtering related power value; In each group matched filtering related power value, choose maximum and write down correspondence position; If this maximum is simultaneously greater than predefined thresholding, this maximum is the measured value of this descending synchronous code correspondence.Can obtain the measured value and the relevant position of all descending synchronous codes through this processing, simultaneously adjust descending pilot frequency time slot synchronously, can reach the precision of 1 chip after the adjustment according to the pairing position of descending synchronous code of measured value maximum in all descending synchronous codes.
Step 202 is carried out many cell selecting according to above-mentioned descending pilot frequency time slot position synchronous result, obtains comprising many cell lists of descending synchronous code information and correspondence code performance number.
In above-mentioned steps 201, can export the measured value and the relevant position of the descending synchronous code of all sub-districts, so, in this step, carry out many cell selecting according to the output result of above-mentioned steps 201.
As shown in Figure 4, select the process of many sub-districts, comprise following steps:
Steps A 1 is chosen maximum measured value and the corresponding descending synchronous code of record from the pairing code power measurement value of all community downlink synchronous codes.
Steps A 2, the code power measurement value of all the other community downlink synchronous codes and the difference of above-mentioned sign indicating number power greatest measurement and setting threshold value are compared, choose the respective cell of descending synchronous code code power measurement value, and in many cell lists, write down this descending synchronous code and corresponding sign indicating number power greater than above-mentioned difference.
Steps A 3, according to the size of sign indicating number power to the processing of sorting of above-mentioned many cell lists.
Through above-mentioned sequencer procedure, can obtain the many cell lists that sort according to code power measurement value size, comprised descending synchronous code information and correspondence code power in this tabulation.
Step 203 is carried out carrier frequency adjustment and many sub-districts basic training sequences sign indicating number/scrambler affirmation according to the information in above-mentioned many cell lists.
In this step, the information of many sub-districts of selecting according to step 202 is promptly estimated carrier frequency offset according to many cell lists information and is adjusted.In this step, the TD-SCDMA terminal at first needs to receive one section data that comprise descending synchronous code; Afterwards, use needs the descending synchronous code of search cell and the descending synchronous code of many sub-districts to carry out the carrier frequency offset estimation respectively, estimated result is carried out the analysis of most possible property, the frequency offset estimating value that correlation is more intense is weighted on average, and these weights can be determined according to the code power measurement value of descending synchronous code in above-mentioned many cell lists; At last, obtain final exemplary frequency deviation values and control adjustment.This process need carries out repeatedly could satisfying the scope that the carrier frequency offset value reaches setting, for example, makes the target of carrier frequency offset value less than 1kHz through repeatedly adjusting.
The TD-SCDMA terminal just can find the training sequence part data of time slot 0 after the descending pilot frequency time slot exact position is synchronous.Carry out relevantly with the training sequence data of the time slot 0 that receives respectively with 4 basic training sequences sign indicating number/scramblers of each descending synchronous code correspondence, calculate related power.For search cell, the pairing basic training sequences sign indicating number/scrambler of related power maximum is basic training sequences sign indicating number/scrambler that search cell is used.That describes after this search cell that is to say lands the sub-district.
Step 204 is confirmed the basic training sequences sign indicating number/scrambler of above-mentioned many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler.
As shown in Figure 5, confirm the basic training sequences sign indicating number/scrambler of many sub-districts, its step comprises:
Step B1, whether the related power of basic training sequences sign indicating number/scrambler of determining each sub-district is greater than the difference of landing a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a thresholding.
In this step, the input data of adjudicating comprise aforementioned in many cell lists that many cell selecting obtain all basic training sequences sign indicating number/scramblers the related power value, land a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a predefined thresholding.The related power of the basic training sequences sign indicating number of each sub-district is landed the sub-district related power and a difference of setting thresholding is compared with above-mentioned.
Step B2, selecting related power wherein is interfered cell greater than the basic training sequences sign indicating number/scrambler corresponding district of above-mentioned difference.
Step B3 by the related power processing of sorting, obtains many cell lists with many sub-districts of above-mentioned selection.
Through this step, can obtain one and comprise the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler.
Step 205 is carried out carrier frequency according to the related power value of each sub-district in above-mentioned many cell lists and its corresponding basic training sequences sign indicating number/scrambler and is accurately adjusted, lands the sub-district phase place and confirm and land cell system information and read.
In this step, carrying out frequency when accurately adjusting, mainly utilizing in the frame structure Primary Common Control Physical Channel data on the time slot 0 to carry out carrier frequency offset and estimate.
Detailed process is: at first receive the data of whole time slot 0, time slot 0 is carried out joint-detection.When carrying out the channel estimating of joint-detection, need utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in many cell lists to carry out channel estimating, the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the real channel estimating of search cell and other many sub-districts; Utilize this channel estimating, use zero forcing algorithm, perhaps the maximal possibility estimation algorithm carries out joint-detection, obtains the data of Primary Common Control Physical Channel; Utilizing these data to carry out carrier frequency more accurately adjusts.Because after each the adjustment, carrier deviation all can gradually reduce, therefore, above-mentioned frequency is accurately adjusted needs a plurality of processes just can reach system requirements, such as, the system requirements carrier frequency offset is in 200 hertz.
In this step, when landing sub-district phase place affirmation, at first the data that comprise training sequence code of receiving slot 0 utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in many cell lists to carry out channel estimating, and the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the channel estimating after the search cell interference eliminated; Utilize impulse response and land the used descending synchronous code in sub-district and carry out convolution, the sequence that obtains is compared with the descending synchronous code partial data that comprises that receives, and obtains the phase modulation of the descending synchronous code of corresponding subframe.According to the TD-SCDMA system features, this phase place is exclusively used in indication mechanism information interlacing frames.So obtain to detect the interlacing frames of system information after continuous several phase place.
In this step, when landing cell system information and read, according to the interlacing frames of the Primary Common Control Physical Channel of above-mentioned affirmation, for example, 20 milliseconds, 4 TD-SCDMA subframes since the frame head that interweaves, receive the data of the time slot 0 of an interlacing frames.
To time slot 0 data of each subframe, carry out the data demodulates of code channel 0 and code channel 1.At first carry out channel estimating, the basic training sequences sign indicating number of sub-district is landed in utilization and the many sub-districts training sequence code in many cell lists carries out, and the original channel that obtains many sub-districts is estimated; This many sub-district original channel is estimated to carry out each other interference eliminated, obtain the real channel impulse response of search cell and other many sub-districts; Then utilize joint detection algorithm, for example adopt zero forcing algorithm or maximum likelihood algorithm to carry out Data Detection, obtain the data of this subframe code channel 0 and code channel 1; The data of 4 subframes are input to the channel decoding unit, obtain the information of this Primary Common Control Physical Channel, promptly land system information of subdistricts.
So far, terminal is finished the search of initial cell according to many cell informations.With respect to prior art, terminal can be in the search phase of initial cell, Zao the common frequency multi-cell information that detects as far as possible, comprise the descending synchronous code of each sub-district, corresponding sign indicating number power and basic training sequences sign indicating number/scrambler, utilize detected many cell informations then, the frequency of going to land the sub-district is accurately adjusted, is landed sub-district phase place judgement and lands cell system information and read, thereby eliminated the interference that common frequency multi-cell brought when unvanquishable terminal was landed in the prior art, improved the success rate of search of initial zone.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore under the universal that does not deviate from claim and equivalency range and limited, the legend that the present invention is not limited to specific details and illustrates here and describe.
Claims (15)
1. a TD-SCDMA terminal comprises central processing unit and functional module, it is characterized in that, also comprises many cell selecting module and many sub-districts affirmation module;
Many cell selecting module is used for carrying out many cell selecting according to descending pilot frequency time slot position synchronous result, draws the many cell lists that comprise descending synchronous code information and correspondence code power measurement value information;
The TD-SCDMA terminal carries out the carrier frequency adjustment according to the information in above-mentioned many cell lists and many sub-districts basic training sequences sign indicating number/scrambler is confirmed;
Many sub-districts confirm that module is used to confirm the basic training sequences sign indicating number/scrambler of many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler;
The TD-SCDMA terminal confirms that according to many sub-districts the related power value of each sub-district in many cell lists that modules obtain and its corresponding basic training sequences sign indicating number/scrambler carry out carrier frequency and accurately adjust, land the sub-district phase place and confirm and land cell system information and read.
2. TD-SCDMA terminal as claimed in claim 1, it is characterized in that, described many cell selecting module is chosen maximum measured value and the corresponding descending synchronous code of record from the pairing code power measurement value of all community downlink synchronous codes, code power measurement value and above-mentioned sign indicating number power greatest measurement with all the other community downlink synchronous code correspondences compares with the difference of setting threshold value again, take off the respective cell of the code power measurement value of capable synchronous code greater than above-mentioned difference, and the descending synchronous code of the sub-district that record is chosen in many cell lists and corresponding code power measurement value, then, according to the size of code power measurement value to the processing of sorting of many cell lists.
3. TD-SCDMA terminal as claimed in claim 1, it is characterized in that described many sub-districts confirm that modules determine that whether the related power of basic training sequences sign indicating number/scrambler of each sub-district is greater than the difference of landing a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a thresholding; Selecting related power wherein is interfered cell greater than the basic training sequences sign indicating number/scrambler corresponding district of above-mentioned difference; The interfered cell of above-mentioned selection by the related power processing of sorting, is obtained many cell lists.
4. the small region search method of a TD-SCDMA terminal under common-frequency network is characterized in that step comprises:
Step 1, the TD-SCDMA terminal is carried out the descending pilot frequency time slot position synchronous;
Step 2 is carried out many cell selecting according to above-mentioned descending pilot frequency time slot position synchronous result, obtains comprising many cell lists of descending synchronous code information and correspondence code performance number;
Step 3 is carried out carrier frequency adjustment and many sub-districts basic training sequences sign indicating number/scrambler affirmation according to the information in above-mentioned many cell lists;
Step 4 is confirmed the basic training sequences sign indicating number/scrambler of above-mentioned many sub-districts, obtains comprising the related power value of each sub-district and many cell lists of its corresponding basic training sequences sign indicating number/scrambler;
Step 5 is carried out carrier frequency according to the related power value of each sub-district in above-mentioned many cell lists and its corresponding basic training sequences sign indicating number/scrambler and is accurately adjusted, lands the sub-district phase place and confirm and land cell system information and read.
5. small region search method as claimed in claim 4 is characterized in that, in the described step 1, the rough position that terminal is carried out descending pilot frequency time slot successively synchronously and the exact position of descending pilot frequency time slot synchronous.
6. small region search method as claimed in claim 5, it is characterized in that, in the described step 1, the synchronous method of rough position of carrying out descending pilot frequency time slot is: the whole sub-frame data that receives is carried out same power features window ratio calculation and slip ratio, maximizing from all power features window ratios, the pairing position of this maximum is the rough position of the descending pilot frequency time slot in this subframe.
7. small region search method as claimed in claim 5, it is characterized in that, in the described step 1, the synchronous method in exact position of carrying out descending pilot frequency time slot is: utilize the data that contain descending synchronous code one by one all descending synchronous codes to be carried out matching treatment, each descending synchronous code and these data are carried out matched filtering and are obtained one group of matched filtering related power value; In each group matched filtering related power value, choose maximum and write down correspondence position; If this maximum is simultaneously greater than predefined thresholding, this maximum is the measured value of this descending synchronous code correspondence; The above-mentioned processing of process can obtain the measured value and the relevant position of all descending synchronous codes, adjusts descending pilot frequency time slot synchronously according to the pairing position of descending synchronous code of measured value maximum in all descending synchronous codes simultaneously.
8. small region search method as claimed in claim 4 is characterized in that, in the described step 2, the step of many cell selecting comprises:
Steps A 1 is chosen maximum measured value and the corresponding descending synchronous code of record from the pairing code power measurement value of all community downlink synchronous codes;
Steps A 2, the code power measurement value of all the other community downlink synchronous codes and the difference of above-mentioned sign indicating number power greatest measurement and setting threshold value are compared, choose the respective cell of descending synchronous code code power measurement value, and in many cell lists, write down this descending synchronous code and corresponding sign indicating number power greater than above-mentioned difference;
Steps A 3, according to the size of sign indicating number power to the processing of sorting of above-mentioned many cell lists.
9. the described small region search method of claim 4, it is characterized in that, in the described step 3, the method that many sub-districts basic training sequences sign indicating number/scrambler is confirmed is: the basic training sequences sign indicating number/scrambler with each descending synchronous code correspondence carries out relevant with the training sequence data of the corresponding time slot that receives respectively, calculate related power, the pairing basic training sequences sign indicating number/scrambler of related power maximum is basic training sequences sign indicating number/scrambler that search cell is used.
10. small region search method as claimed in claim 4 is characterized in that, in the described step 4, confirms that the basic training sequences sign indicating number/scrambler of above-mentioned many sub-districts comprises:
Step B1, whether the related power of basic training sequences sign indicating number/scrambler of determining each sub-district is greater than the difference of landing a pairing related power value of sub-district basic training sequences sign indicating number/scrambler and a thresholding;
Step B2, selecting related power wherein is interfered cell greater than the basic training sequences sign indicating number/scrambler corresponding district of above-mentioned difference;
Step B3 by the related power processing of sorting, obtains many cell lists with the interfered cell of above-mentioned selection.
11. small region search method as claimed in claim 4 is characterized in that, in the described step 5, the method that frequency is accurately adjusted is: receive the data of corresponding time slot, this time slot is carried out joint-detection, to obtain the data of Primary Common Control Physical Channel; Utilizing these data to carry out carrier frequency more accurately adjusts.
12. small region search method as claimed in claim 11, it is characterized in that, when carrying out the channel estimating of joint-detection, utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in many cell lists to carry out channel estimating, the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the real channel estimating of search cell and other many sub-districts; Utilize this real channel estimating again, carry out joint-detection.
13. small region search method as claimed in claim 12 is characterized in that, to the real channel estimating that obtains, uses zero forcing algorithm or maximal possibility estimation algorithm, carries out joint-detection.
14. small region search method as claimed in claim 4, it is characterized in that, in the described step 5, the method of landing sub-district phase place affirmation is: the data that comprise training sequence code that at first receive corresponding time slot, utilize the basic training sequences sign indicating number of search cell and the many sub-districts training sequence code in above-mentioned many cell lists to carry out channel estimating, the original channel that obtains many sub-districts is estimated; Again many sub-districts original channel is estimated to carry out each other interference eliminated, obtain the channel estimating after the search cell interference eliminated; Utilize impulse response and land the used descending synchronous code in sub-district and carry out convolution, the sequence that obtains is compared with the descending synchronous code partial data that comprises that receives, and obtains the phase modulation of the descending synchronous code of corresponding subframe.
15. small region search method as claimed in claim 4, it is characterized in that, in the described step 5, landing the method that cell system information reads is: at first, the basic training sequences sign indicating number of sub-district is landed in utilization and the many sub-districts training sequence code in above-mentioned many cell lists carries out channel estimating, and the original channel that obtains many sub-districts is estimated; Afterwards, this many sub-district original channel is estimated to carry out each other interference eliminated, obtain the real channel impulse response of search cell and other many sub-districts; Utilize joint detection algorithm to carry out Data Detection again, obtain the data of the corresponding code channel of subframe; At last, the data of corresponding subframe are input to the channel decoding unit, obtain landing system information of subdistricts.
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| CN101193332B (en) | 2006-11-20 | 2011-01-26 | 大唐移动通信设备有限公司 | Method, system and base station for sending broadcast service data in same-frequency network |
| CN101523950B (en) * | 2007-01-08 | 2011-03-16 | 华为技术有限公司 | Method and system for generating a set of target cells suitable for handover from a source cell in a cellular communication system |
| CN101466071B (en) * | 2007-12-17 | 2010-11-10 | 华为技术有限公司 | Method and apparatus for distributing time frequency resource |
| CN101583080B (en) * | 2008-05-12 | 2011-08-10 | 华为技术有限公司 | Method, device and system for measuring regional signal |
| CN101291511B (en) * | 2008-06-11 | 2011-01-26 | 北京邮电大学 | Carrier detecting method for downlink signal of TD-SCDMA |
| CN101651465B (en) * | 2008-07-21 | 2014-08-06 | 美满电子科技(上海)有限公司 | Carrier ordering method and device |
| CN101765130A (en) * | 2008-12-23 | 2010-06-30 | 中兴通讯股份有限公司 | Cell measuring method and device in multi-carrier system |
| CN102111855B (en) * | 2009-12-25 | 2014-03-12 | 中兴通讯股份有限公司 | Communication system and method for updating system information in communication system |
| CN102131276B (en) * | 2010-01-12 | 2013-10-23 | 中国移动通信集团公司 | Method for sending and receiving system information of co-station multiple cells and evolution node base (eNB) |
| CN103428872A (en) * | 2012-05-15 | 2013-12-04 | 马维尔国际有限公司 | Method and apparatus for eliminating co-channel interference |
| CN116015345B (en) * | 2022-12-27 | 2023-09-12 | 中国人民解放军军事科学院系统工程研究院 | Satellite communication spread spectrum signal blind analysis method based on independent component analysis |
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