CN100377504C - First-step search of initial zone in time division synchronizing CDMA system - Google Patents
First-step search of initial zone in time division synchronizing CDMA system Download PDFInfo
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Abstract
The present invention relates to a method for the first step of an initial cell search in a time division-synchronous code division multiple access (TD-SCDMA) system, which comprises the steps: the data of a subframe is divided into M time slices, and signals in the first time slice are received in a plurality of continuous subframes; the received signal of each subframe is in sliding correlation with all the 32 downlink synchronous codes, and the correlation results of the subframes are accumulated; a maximum value is found out of the accumulated correlation results so as to record a corresponding value, the downlink synchronous codes and a correlation position. The maximum value of the correlation results of each time slice, the downlink synchronous codes corresponding to the maximum value and the correlation position are orderly obtained in the same way, and the downlink synchronous code corresponding to the maximum value of all the values (M in total) serves as the downlink synchronous code detected in the first step of the cell search; the frame header position of the subframe detected in the first step of the cell search can be obtained by the time slice information and the position information corresponding to the maximum value. The present invention can greatly reduce the power consumption of user equipment under the same condition.
Description
Technical field
The present invention relates to a kind of wireless communication system of being applied to, be particularly related to a kind of TD SDMA (Time Division Synchronous Code-Division Multiple Access that is applied to, abbreviation TD-SCDMA) in the mobile communication system, subscriber terminal equipment carries out the method and apparatus of the downlink pilot search of search of initial zone.
Background technology
Nineteen forty-six, the Bell Laboratory of the U.S. has just proposed the service area of mobile phone is divided into several sub-districts, and a base station is established in each sub-district, constitutes honeycomb (Cellular) the mobile communication new ideas of cellular communication system.1978, this system succeedd in the Chicago,U.S test, and formally puts it into commercial operation in nineteen eighty-three.The employing of cellular system makes identical frequency to reuse, thereby has increased the capacity of mobile communication system greatly, has adapted to the desirability that mobile communication subscriber increases suddenly.The development of cell mobile communication systems experienced one from the simulation net to digital network, from frequency division multiple access (FDMA) to time-division multiple access (TDMA) with the process of code division multiple access (CDMA).
Along with development of times, people comprise the requirement to communication quality and class of business etc. to the requirement of communication, and are also more and more higher.The third generation (3G) mobile communication system is grown up in order to satisfy this requirement just.It is as basic point of departure with global general-use, system synthesis, and attempt to set up the mobile comprehensive service digital network in a whole world, the function of various mobile communication system such as comprehensive honeycomb, wireless, paging, cluster, mobile data, mobile-satellite, aerial and sea, provide and the professional compatibility of fixed telecommunication network, multiple speech and the non-speech service that quality is suitable, carry out the global roaming of pocket personal terminal, thus realize human dream of anywhere, any time and anyone ideal that communicates.
That most critical is radio transmission techniques (RTT) in the 3-G (Generation Three mobile communication system).The RTT candidate motion that International Telecommunications Union in 1998 collects: except that 6 satellite interface technical schemes, the terrestrial wireless interfacing has 10 schemes, is divided into two big class: CDMA and TDMA, and wherein CDMA occupies an leading position.In CDMA technology, International Telecommunications Union has accepted 3 kinds of standards at present altogether, i.e. the TD-SCDMA standard of the CDMA 2000 of the W-CDMA of Europe and Japan, the U.S. and China.
Compare with other 3G (Third Generation) Moblie standard, TD-SCDMA has adopted many exclusive advanced technologies, and all has outstanding advantage aspect the technology, economic two.TD-SCDMA adopts time division duplex (Time Division Duplex, TDD), smart antenna (Smart Antenna), joint-detection technology such as (JointDetection), the availability of frequency spectrum is very high, can solve the problem of high population density area frequency resource anxiety, and have potential advantages aspect the multimedia services such as asymmetric mobile data such as internet browsing and video request program.
As shown in Figure 1, be the example of a typical cell mobile communication systems.This system is by a plurality of sub-districts 10
1-10
N(10) constitute, a base station (Base Station) 11 is wherein respectively arranged in each sub-district
1-11
N(11), the subscriber terminal equipment (UserEquipment is abbreviated as UE) 12 that in this sub-district service range, has some simultaneously
1-12
N(12).Each subscriber terminal equipment 12 by with affiliated Serving cell 10 in base station 11 keep being connected, finish and other communication equipment between communication function.
Each after subscriber terminal equipment 12 starts, general and do not know its residing position and should select which base station 11 (perhaps the sub-district 10) to carry out relevant up access (Uplink Access) and operate.The process that subscriber terminal equipment selects the sub-district to insert is commonly referred to as " search of initial zone " (InitialCell Search) process.The purpose that subscriber terminal equipment 12 carries out search of initial zone is to select suitable working frequency points, and on this frequency, obtain with certain sub-district 10 in the down-going synchronous of base station 11, understand the relevant system broadcast message that this base station 11 sends simultaneously---according to these information, subscriber terminal equipment 12 could begin relevant up access procedure, and final set up with this base station 11 between be connected.
As shown in Figure 2, be the frame structure schematic diagram of TD-SCDMA system.This structure is according to low spreading rate time division duplex (LCR-TDD) pattern (1.28Mcps) among 3G collaborative project (3GPP) standard TS 25.221 (Release4), perhaps provides among China Wireless Telecommunication Standar (CWTS) standard TSM 05.02 (Release3).The spreading rate of TD-SCDMA system is 1.28Mcps, each radio frames (RadioFrame) 20
0, 20
1(20) length is 5ms, i.e. 6400 chips (for 3GPP LCR-TDD system, each radio frames length is 10ms, and the subframe (subframe) that can be divided into two length be 5ms, and wherein each subframe comprises 6400 chips).Wherein, the radio frames in each TD-SCDMA system (the perhaps subframe in the LCR system) 20 can be divided into 7 time slots again (TS0～TS6) 21
0-21
6(51), and two pilot time slots: descending pilot frequency time slot (DwPTS) 22 and uplink pilot time slot (UpPTS) 24, and protection (Guard) 23 at interval.Further, the TS0 time slot 21
0Be used to bearing system broadcast channel and other possible downlink traffic channel; And TS1～TS6 time slot 21
1-21
6Then be used to carry the uplink and downlink Traffic Channel.It is synchronous that uplink pilot time slot (UpPTS) 24 and descending pilot frequency time slot DwPTS time slot 22 are used to set up initial uplink and downlink respectively.TS0～TS6 time slot 21
0-21
6Length is 0.675ms or 864 chips, wherein comprises data segment DATA1 (27) and DATA2 (29) that two segment lengths are 352 chips, and a middle segment length is the training sequence of 144 chips---in lead sign indicating number (Midamble) sequence 28.The Midamble sequence is significant at TD-SCDMA, comprise cell ID, channel estimating and synchronously modules such as (comprising Frequency Synchronization) all to use it.The protection that DwPTS time slot 22 comprises 32 chips at interval 30 and one long be descending synchronous code (SYNC-DL) code word 25 of 64 chips, its effect is cell ID and sets up initial synchronisation; And the UpPTS time slot comprise one long be uplink synchronous code (SYNC-UL) code word 26 of 128 chips, subscriber terminal equipment utilizes it to carry out relevant up access procedure.
According to the relevant definition among 3GPP standard TS 25.224 (Release 4) or the CWTS standard TSM 05.08 (Release3), in the TD-SCDMA system, after finishing initial frequency selection, on each candidate's frequency, initial cell search procedure can be divided into following four steps:
First step, DwPTS search: after 32 SYNC-DL code words 25 are carried out relevant treatment or similar processing with the received signal sequence altogether by the general, obtain the synchronizing information of DwPTS time slot, and then obtain the subframe timing information, and detect most possible SYNC-DL code word simultaneously;
Second step, scrambler and Midamble codeword sequence detect: after obtaining the DwPTS coarse position information, can receive according to TD-SCDMA frame structure user terminal and to be positioned at TS0 (21
0) on P-CCPCH (Primary Common Control Physical Channel) channel on Midamble part received signal 28.Because each SYNC-DL code word 25 corresponding code character (Code Group), 4 possible Midamble codeword sequences have been comprised, therefore by after the received signal of these 4 possible code words and the last Midamble part of TS0 is carried out relevant treatment or similar processing, can the system of detecting adopt wherein which Midamble codeword sequence; Because there are one-to-one relationship in scrambler (Scrambling Code) and Midamble code word, so scrambler obtains after also can detecting the Midamble codeword sequence simultaneously;
Third step, the control multi-frame is synchronous: in the TD-SCDMA system by SYNC-DL sign indicating number 25 being carried out QPSK (quarternary phase-shift keying (QPSK)) modulation and determining to control the beginning of multi-frame (Control Multi-frame) according to the phase modulation pattern on the SYNC-DL code word 25 in continuous four frames.User terminal is by determining that to the detection that receives modulation phase pattern on the SYNC-DL character signal control multi-frame is synchronous;
The 4th step, read BCCH (broadcast channel) information: after acquisition control multi-frame was synchronous, just can know had the BCCH system broadcast message to exist on which frame; User terminal carries out demodulation (Demodulation) and decoding (Decoding) to the reception data on the P-CCPCH of these frames, carries out Cyclic Redundancy Check then; If verification is passed through, then this piece BCCH information is considered to effectively and is delivered to high level, and the initial cell process successfully finishes.
The method of search of initial zone and device design thereof are one of important topics in the TD-SCDMA system design.On the one hand, because subscriber terminal equipment carries out often having only before the search of initial zone (even without any) system information seldom, and (for example may face more abominable channel circumstance, when the user is in cell edge or is in the shadow region), therefore require designed initial cell searching method to have good performance, Target cell can be found within a short period of time, various start environment can be adapted to; On the other hand, require this design to have rational complexity again, avoid since the software/hardware resource consumption too much or power consumption a series of problems of implementation of bringing such as too big.
Especially, in the TD-SCDMA system, the design of the downlink pilot search method of aforementioned search of initial zone is particularly crucial to global design: because subscriber terminal equipment is also without any timing information at this moment, so often need by after in whole radio frames, carrying out carrying out a series of slip associative operations and subsequent treatment between received signal and one or more (maximum 32) alternative SYNC-DL code word, could determine the SYNC-DL code word that relevant timing information and power are the strongest, begin the relevant processing of search of initial zone second step then.For example, at International Patent Application Publication No. WO03/028399, denomination of invention is among " small region search method and communication terminal device " (CELL SEARCH METHOD AND COMMUNICATIONTERMINAL APPARATUS), a kind of method and apparatus of carrying out the downlink pilot search method of described Cell searching in the TD-SCDMA system is mainly disclosed, it is relevant at first each SYNC-DL sign indicating number and received signal to be slided in this method, and finds the SYNC-DL of correlation maximum and correspondence position thereof as output.
Prior art as shown in Figure 3 is a kind of correlator that is applied to the downlink pilot search method of TD-SCDMA system search of initial zone.At first, receive data through at first sampling, analog-to-digital conversion and base-band digital matched filtering after, obtain receiving of the input of data signal samples stream as this correlator.Wherein, sampling rate generally is chosen as certain multiple of spreading rate, for example adopts 2 times of over-samplings, promptly carries out 2 samplings in each chip-spaced; Analog-to-digital conversion (ADC) is used for input analog sampling value is quantified as corresponding digital value, offers digital baseband unit and carries out a series of processing; The base-band digital matched filter is mainly used in outer interference of filtering band and noise, and typical value of the quantizing bit number M of its output digital signal is 6 or 8.After correlator receives the data sampling input, at first by 31 pairs of inputs of despining device I/Q two-way sampled value a
nCarry out obtaining b after the despining
nThis operation is corresponding with the rotary manipulation of transmitter terminal.Particularly, available following formula sign is operated in despining:
b
n＝a
n*(-j)
n (n＝0，1，2，…)
Wherein, a
nAnd b
nBe respectively input, the output symbol of despining device 31, subscript n is the input sample sequence number, and j is-1 unit root.In fact, with complex representation symbol a
nAnd b
n(wherein the corresponding I of real part road is an in-phase component, and the corresponding Q of imaginary part road is a quadrature component): a
n=ai
n+ j*aq
n, b
n=bi
n+ j*bq
n, then following formula is set up:
bi
n＝ai
n，bq
n＝aq
n (n＝4k，k＝0，1，2，…)
bi
n＝aq
n，bq
n＝-ai
n (n＝4k+1，k＝0，1，2，…)
bi
n＝-ai
n，bq
n＝-aq
n (n＝4k+2，k＝0，1，2，…)
bi
n＝-aq
n，bq
n＝ai
n (n＝4k+3，k＝0，1，2，…)
Therefore, this despining device can pass through realizations such as the exchange of I/Q road, negate and counting unit.Data sampling after the despining is divided into I and Q two-way, is moved into two groups of registers group 32 that respectively contain 64 M bit register respectively
1-64With 34
1-64As shown in Figure 3: in n-hour, each new data sample is moved into Q bit register 32 respectively
1With 34
1, the value of each register in each registers group is moved into the register on the right simultaneously.With the I road is example, this means register 32
iOriginal storing value is moved into register 32
I+1In, i=1 wherein, 2 ..., 63, and register 32
64In original storing value be dropped.Subsequent, the storing value of each register in two groups of registers group is according to the corresponding bit in the candidate SYNC-DL code word, respectively by a collection of " keeping/get negative " unit 33
1-64With 35
1-64Suppose that the storing value in the two groups of registers group in I road and Q road is respectively { bi
N, bi
N-1..., bi
N-63And { bq
N, bq
N-1..., bq
N-63; And hypothesis candidate SYNC-DL code word is { s
1, s
2..., s
64, s wherein
kValue be 0 or 1 (k=1,2 ..., 64), " keeping/get negative " unit 33 of the k on the I road then
kInput bi
N+1-k, s
kWith output ui
kConcern that available following formula characterizes:
Ui
k=bi
N+1-kIf s
k=1;
Ui
k=-bi
N+1-kIf s
k=0 (k=1,2 ..., 64)
Similarly, the k on the Q road " keeping/get negative " unit 35
kInput bq
N+1-k, s
kWith output uq
kConcern that available following formula characterizes:
Uq
k=bq
N+1-kIf s
k=1;
Uq
k=-bq
N+1-kIf s
k=0 (k=1,2 ..., 64)
Then, gained intermediate object program { ui
1, ui
2..., ui
64And { uq
1, uq
2..., uq
64Be transfused to two adders 36 respectively
1With 36
2, obtaining two adder output ci and cq, described additional calculation can characterize with following formula:
c
i＝ui
1+ui
2+…+ui
64
cq＝uq
1+uq
2+…+uq
64
At last, the output ci of two adders and cq are admitted to a power counter 37, output correlated results performance number p
NAvailable following formula characterizes:
p
N＝ci
2+cq
2
Correlator like this, has as shown in Figure 3 just been finished the correlation value calculation of n-hour.When a new sampled value input is arranged at every turn, this correlator just can produce a correlated results output through behind the aforesaid operations; Along with the continuous input that receives data sampling stream, this correlator has just produced a series of relevant outputs, thereby has finished " slip " correlated process like this.Then, the subsequent treatment module will be finished relevant synchronous and measuring ability according to these relevant outputs through after a series of processing.
Though though this device can reach optimum in theory performance, its complexity is very high, this means and to consume a lot of processor resources and more power consumption.Suppose 2 times of fast data samplings of received signal input employing (promptly corresponding each chip has two input samples inputs), and 6 bit quantizations are adopted in each sampling, because the SYNC-DL code word size is 64, the relevant addition and subtraction of each 64 12-bit of reality/imaginary part that needs of corresponding 64 samplings is operated, and carries out the relevant treatment needs of each SYNC-DL like this:
64*2*6400*2＝1,638,400
First step is finished in individual 12-bit addition and subtraction operation.For the search of initial zone of TD-SCDMA system,, therefore adopt correlator configuration as shown in Figure 3 will make the entire process process more complicated or consuming time owing to carry out the search and the synchronizing process of 32 SYNC-DL sign indicating numbers possibly simultaneously.Because if will carry out the relevant treatment of all 32 code words simultaneously, then in 5ms, finish altogether:
1,638,400*32＝52,428,800
Individual 12-bit addition and subtraction operation---this is that generally institute is unapproachable for present commercial software/hardware disposal ability.Therefore,, often can only in each 5ms, only carry out the relevant treatment of a collection of several SYNC-DL code words (for example 2 or 4 code words), and all alternative SYNC-DL code words are divided into many batches handle in order to realize this device.The purpose of doing like this is the requirement that reduces the software/hardware disposal ability, but the cost of being paid is to have elongated the time that the downlink pilot search method of carrying out search of initial zone is spent.Adopt this method all to need to open the RF/ABB module in free simultaneously in the institute of the downlink pilot search method of Cell searching, also very big for the mobile phone power consumption.Therefore, how reducing the complexity and the power consumption of this correlator, guarantee again synchronously simultaneously and detect performance to meet design requirement, is one of key issue that is faced in the initial cell search procedure design of TD-SCDMA system.
Summary of the invention
The object of the present invention is to provide a kind of method that UE in TD SDMA (TD-SCDMA) mobile communication system carries out the downlink pilot search method of search of initial zone that is applied to, can finish the detection of frame synchronization and synchronization code word within a short period of time under low Signal to Interference plus Noise Ratio (SINR) condition.Can reduce the power consumption of subscriber equipment (UE) under the same conditions greatly.
The invention provides the timeslice segmentation correlation process method in the downlink pilot search method a kind of TD-SCDMA of being applied to system customer equipment receiver, that carry out search of initial zone, said method comprising the steps of:
The data of a subframe are divided into M timeslice, and the length of each timeslice is M+W sampled value of 6400 * N ÷.N is the over-sampling rate of input signal, and W is the direct lap of timeslice, and M is the number of the timeslice of division.The length of considering descending synchronous code is 64chips, and the value of W is at least 64 * Nsamples, and purpose is in order to obtain M correlated results of 6400 * N ÷ for each descending synchronous code in each timeslice.
At first in continuous several subframes, all receive the signal in first timeslice, and it is relevant that the received signal of each subframe is done slip to all 32 descending synchronous codes (SYNC-DL code), and the correlated results of these several frames is added up.From the correlated results that adds up, find out a maximum, and remember corresponding value, descending synchronous code and relevant position.
Can obtain maximum and the pairing descending synchronous code and the relevant position of the correlated results of each timeslice successively with identical method.
With all these values (total M value) detected descending synchronous code of downlink pilot search method that the maximum pairing descending synchronous code of value is a Cell searching, the downlink pilot search method that then can obtain Cell searching by pairing timeslice of the value of maximum and positional information detects subframe frame head position.
Further, the present invention also provides the method a kind of TD-SCDMA of being applied to system customer equipment receiver, that be used to accelerate search of initial zone.Concrete method is:
The correlated results that adds up for some timeslices, calculate the ratio of the mean value of maximum and other all values except maximum, if this ratio is greater than the thresholding of setting, think that then the downlink pilot search method of Cell searching finishes, according to this maximum for descending synchronous code, relevant position, timeslice obtain the result of the downlink pilot search method of Cell searching.Since adopt method of the present invention be simultaneously 32 descending synchronous codes are done simultaneously relevant, if like this in certain timeslice detected peak value clearly just can think and detected a strongest sub-district.By adopting this method can statistically can reduce the time of the required cost of downlink pilot search method of Cell searching greatly.
Realize according to the present invention be used for TD-SCDMA system subscriber terminal equipment the method and apparatus that carries out search of initial zone, have relatively low relevant complexity, and can under more abominable propagation conditions, reach the higher detection probability.Simultaneously because implementation of the present invention only needs the part-time (timeslice) of each subframe to open the RF/ABB module, with respect to the method that need in whole cell search process, all need to open the RF/ABB module, can shorten search of initial zone time and the power consumption that reduces subscriber equipment (UE) in the TD-SCDMA system effectively.Simultaneously because the continuous several frames of this method all receive the signal of sheet at the same time, AGC (automatic gain control) design for the downlink pilot search method of Cell searching, the gain meeting of AGC (automatic gain control) is more accurate, thereby improves the performance of search of initial zone.The present invention can accept or reject in disposal ability with between the processing time mutually by choosing different parameters, and the present invention who makes can use the commercial software/hardware processor with the different disposal ability.
Objects and advantages of the present invention are by following description to the method and apparatus of search of initial zone in the TD-SCDMA system, and it is more and more obvious to become.
Description of drawings
Fig. 1 is the rough schematic of a typical cell mobile communication systems;
Fig. 2 is the frame structure schematic diagram of TD-SCDMA system;
Fig. 3 is the relevant apparatus that belongs to prior art of the downlink pilot search method of a kind of TD-SCDMA of being applied to system search of initial zone;
The schematic diagram of the timeslice among Fig. 4 the present invention;
Fig. 5 is the flow chart of the method that realizes the downlink pilot search method that is applied to TD-SCDMA system search of initial zone of the present invention;
Fig. 6 is to the realization flow figure of the method for further optimization of the present invention;
Embodiment
Below by Fig. 4 to Fig. 6, introduce a specific embodiment of the present invention in detail, so that further understand summary of the invention of the present invention.
As shown in Figure 5: the downlink pilot search method of TDS-CDMA system search of initial zone of the present invention comprises the steps:
Step 6 is judged the average number of sub-frames (Step1AveSf) whether counter J equals to set, if then jump to step 61, otherwise just jumps to step 2.
Step 8, m adds one with counter.
Step 9 judges whether counter m equals M, if do not wait then jump to step 2.
With all these values (total M value) detected descending synchronous code of downlink pilot search method that the maximum pairing descending synchronous code of value is a Cell searching, the downlink pilot search method that then can obtain Cell searching by pairing timeslice of the value of maximum and positional information detects subframe frame head position.
Introduce a specific embodiment of optimization method of the present invention in detail below by Fig. 6.
Step 6 is judged the average number of sub-frames (Step1AveSf) whether counter J equals to set, if then jump to step 61, otherwise just jumps to step 2.
Value and pairing descending synchronous code and relevant position.
Step 8, UE (subscriber equipment) calculates the maximum of correlated results and owning except maximum
Ratio between the mean value of other values.
Step 9, the relatively maximum of correlated results and the mean value of the every other value except maximum
Between ratio whether greater than the threshold value of setting.If greater than would jump to step 13.
With all these values (total M value) detected descending synchronous code of downlink pilot search method that the maximum pairing descending synchronous code of value is a Cell searching, the downlink pilot search method that then can obtain Cell searching by pairing timeslice of the value of maximum and positional information detects subframe frame head position.
Claims (3)
1. the downlink pilot search method of a TDS-CDMA system search of initial zone, it comprises the steps:
Step 1, with used counter K in the computational process, m, the J zero clearing, and with the memory zero clearing that can use in the computational process; Counter K is used for sub-frame count, and counter m is used for the timeslice counting, and counter J is used for the counting to average subframe lengths;
Step 2, subscriber equipment receives the signal that belongs to m timeslice of K subframe, and counter K is added one;
Step 3, the K subframe that subscriber equipment will be imported belong to m timeslice signal do with 32 descending synchronous codes respectively and slide relevantly, can obtain M correlated results of 32 * 6400 * N ÷ like this; N is the over-sampling rate of input signal, and M is the number of the timeslice of division;
Step 4, the corresponding data that subscriber equipment is deposited correlated results and memory adds up and result of calculation is put into the memory relevant position again;
Step 5, J adds one with counter;
Step 6 is judged the average number of sub-frames whether counter J equals to set, if then jump to step 61, otherwise just jump to step 2;
Step 61 is with counter J clear 0;
Step 7, subscriber equipment is found out maximum from the correlated results that adds up, and remembers this value and pairing descending synchronous code and relevant position;
Step 8, m adds one with counter;
Step 9 judges whether counter m equals M, if do not wait, then jumps to step 2;
Step 10, subscriber equipment be the maximum of all M timeslice relatively, finds out the maximum in this M value, and obtains the pairing descending synchronous code of this maximum, relevant position and timeslice;
Subscriber equipment detects subframe frame head position as exporting the result to realize search of initial zone by the downlink pilot search that calculating pairing timeslice of maximum and positional information obtain Cell searching.
2. the downlink pilot search method of TDS-CDMA system search of initial zone as claimed in claim 1 is characterized in that, also comprises:
Step 11, the output result of the downlink pilot search of subscriber devices compute Cell searching.
3. the downlink pilot search method of a TDS-CDMA system search of initial zone, it comprises the steps:
Step 1, with used counter K in the computational process, m, the J zero clearing, and with the memory zero clearing that can use in the computational process, counter K is used for sub-frame count, and counter m is used for the timeslice counting, and counter J is used for the counting to average subframe lengths;
Step 2, subscriber equipment receives the signal that belongs to m timeslice of K subframe, and counter K is added one;
Step 3, the K subframe that subscriber equipment will be imported belong to m timeslice signal respectively with 32 descending synchronous codes do slide relevant, can obtain M correlated results of 32 * 6400 * N ÷ like this, N is the over-sampling rate of input signal, and M is the number of the timeslice of division;
Step 4, the corresponding data that subscriber equipment is deposited correlated results and memory adds up and result of calculation is put into the memory relevant position again;
Step 5, J adds one with counter;
Step 6 is judged the average number of sub-frames whether counter J equals to set; If then jump to step 61, otherwise just jump to step 2;
Step 61 is with counter J clear 0;
Step 7, subscriber equipment is found out maximum from the correlated results that adds up, and remembers this value and pairing descending synchronous code and relevant position;
Step 8, the ratio between the mean value of the maximum of subscriber devices compute correlated results and the every other value except maximum;
Step 9, relatively whether the ratio between the mean value of the maximum of correlated results and the every other value except maximum greater than the threshold value of setting, if greater than would jump to step 13;
Step 10, m adds one with counter;
Step 11 judges whether counter m equals M, if do not wait then jump to step 2;
Step 12, subscriber equipment be the maximum of all M timeslice relatively, finds out the maximum in this M value, and obtains the pairing descending synchronous code of this maximum, relevant position and timeslice;
Step 13, the output result of the downlink pilot search of subscriber devices compute Cell searching;
Subscriber equipment detects subframe frame head position as exporting the result to realize search of initial zone by the downlink pilot search that calculating pairing timeslice of maximum and positional information obtain Cell searching.
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| CN2005100968418A Division CN1801650B (en) | 2005-07-14 | 2005-07-14 | Method for carrying out initial cell search first step by user terminal |
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|---|---|---|---|---|
| CN101478721B (en) * | 2008-01-04 | 2012-12-19 | 中兴通讯股份有限公司 | Carrier cell preamble configuring method special for multimedia broadcast and multicast system |
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