CN101032092A - Base station device in multi-carrier transmission, mobile station device, and cell search method - Google Patents
Base station device in multi-carrier transmission, mobile station device, and cell search method Download PDFInfo
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- CN101032092A CN101032092A CNA2005800329287A CN200580032928A CN101032092A CN 101032092 A CN101032092 A CN 101032092A CN A2005800329287 A CNA2005800329287 A CN A2005800329287A CN 200580032928 A CN200580032928 A CN 200580032928A CN 101032092 A CN101032092 A CN 101032092A
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Abstract
There is provided a mobile station device capable of reducing processing of cell search. In this device, an FFT timing detection unit (603) detects a symbol timing and a frame timing detection unit (606) detects a frame timing by using the frame timing detection symbol. After a frame timing is detected, a code group detection unit (608) detects a code group and a scrambling code identification unit (610) identifies a scrambling code. That is, the frame timing detection process is separated from the code group detection process and after detecting the frame timing, a symbol timing multiplied by the code group sequence is identified so that the code group is detected only at the symbol timing.
Description
Technical field
The present invention relates to base station apparatus, mobile station apparatus and Cell searching (cell search) method in multicarrier (multi-carrier) transmission.
Background technology
Be in the mobile communication on a large scale of representative with mobile phone etc., for the output of the electric wave that reduces the base station, the communication zone that a base station is covered is divided into the little zone that is called sub-district (cell) and manages.Mobile radio stations such as mobile phone by suitably selecting to utilize these sub-districts (base station), can make communication continue when power connection or during conversion (handover).Select the situation of sub-district to be called " Cell searching " mobile radio station.In Cell searching, the minimum sub-district of path loss (path loss) is promptly detected in the sub-district of the best that mobile radio station should connect when detecting power connection.More particularly, each sub-district is by intrinsic scrambler (scrambling code) identification, and Cell searching detects the signal that sends in downgoing line by mobile radio station received power is carried out for the scrambler of maximum sub-district.
But mobile radio station will once be distinguished a plurality of scramblers, and existence will spend the problem of corresponding time and computational load, and the technology requirement that addresses this problem is being improved constantly.
As the prior art relevant with Cell searching, the three stage cell searching modes (for example, with reference to patent documentation 1) of for example useful OFCDM (OrthogonalFrequency and Code Division Multiplexing) mode.
In the prior art that patent documentation 1 is put down in writing, by scrambler being divided into several groups (for example 32 groups), and can detect scrambler at high speed.Specifically, in second stage, the related operation that carries out between adjacent code element detects frame timing and code group; In the phase III, be subordinated in the candidate scramble code of the detected code group of second stage, distinguish scrambler by related operation.
The existing frame structure of representing OFCDM at Fig. 1.As shown in Figure 1, at frame boundaries, pilot tone (pilot) code element is continuous at time-axis direction, to the pilot frequency code element at frame end, multiply by the code group sequence of the group of expression scrambler.
Fig. 2 is illustrated in the existing second stage of the Cell searching that mobile radio station carries out and handles.The sequence that mobile radio station extracts by the complex conjugate multiplication computing that calculate to utilize between adjacent code element is relevant with candidate's code group, detects frame timing and scrambler group.Code group and frame are regularly detected simultaneously by the related operation between this adjacent pilot frequencies code element.
Patent documentation 1: TOHKEMY 2003-244763 communique.
Summary of the invention
But, in the prior art shown in the patent documentation 1, owing to carry out the detection and the frame timing detection of code group simultaneously, need all code elements in 1 frame to carry out the related operation of code group quantity, so cause the treating capacity of second stage to increase.
The purpose of this invention is to provide a kind of base station apparatus, mobile station apparatus and small region search method that can alleviate the processing of Cell searching.
Base station apparatus of the present invention adopts has component parts, by pilot frequency code element and data symbols configuration frame; Multiplying unit is to multiply by the code element that the code group sequence is used as being used to detect code group in specific pilot frequency code element or specific data symbols that above-mentioned frame comprised; Transmit block sends to comprise and is used to detect the frame code element regularly and the structure of the above-mentioned frame of the above-mentioned code element that is used to detect code group.
In addition, mobile station apparatus of the present invention adopts has first detection part, is used to detect frame code element regularly and detects frame regularly; Second detection part, detect above-mentioned frame regularly the back code element that is used to detect code group detect code group.
The effect of invention
According to the present invention, can alleviate the processing of Cell searching.
Description of drawings
Fig. 1 is the transmission frame format of existing base station apparatus.
Fig. 2 is the figure of action of the Cell searching of the existing mobile station apparatus of expression.
Fig. 3 is the structure chart of the mobile body communication system that relates to of execution mode 1.
Fig. 4 is the transmission frame format of the base station apparatus that relates to of execution mode 1.
Fig. 5 is the block diagram of the structure of the base station apparatus that relates to of expression execution mode 1.
Fig. 6 is the action flow chart of the base station apparatus that relates to of execution mode 1.
Fig. 7 is the block diagram of the structure of the mobile station apparatus that relates to of expression execution mode 1.
Fig. 8 A is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 1.
Fig. 8 B is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 1.
Fig. 9 is the action flow chart of the mobile station apparatus that relates to of execution mode 1.
Figure 10 is the block diagram (changing example) of the structure of the mobile station apparatus that relates to of expression execution mode 1.
Figure 11 is the transmission frame format of the base station apparatus that relates to of execution mode 2.
Figure 12 is the action flow chart of the base station apparatus that relates to of execution mode 2.
Figure 13 A is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 2.
Figure 13 B is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 2.
Figure 14 is the transmission frame format of the base station apparatus that relates to of execution mode 3.
Figure 15 is the action flow chart of the base station apparatus that relates to of execution mode 3.
Figure 16 A is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 3.
Figure 16 B is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 3.
Figure 17 is the transmission frame format of the base station apparatus that relates to of execution mode 4.
Figure 18 is the action flow chart of the base station apparatus that relates to of execution mode 4.
Figure 19 A is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 4.
Figure 19 B is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 4.
Figure 20 is the action flow chart of the mobile station apparatus that relates to of execution mode 4.
Figure 21 is the transmission frame format of the base station apparatus that relates to of execution mode 5.
Figure 22 is the action flow chart of the base station apparatus that relates to of execution mode 5.
Figure 23 is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 5.
Figure 24 is the transmission frame format of the base station apparatus that relates to of execution mode 6.
Figure 25 is the action flow chart of the base station apparatus that relates to of execution mode 6.
Figure 26 A is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 6.
Figure 26 B is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 6.
Figure 27 is the action flow chart of the mobile station apparatus that relates to of execution mode 6.
Figure 28 is the transmission frame format of the base station apparatus that relates to of execution mode 7.
Figure 29 is the action flow chart of the base station apparatus that relates to of execution mode 7.
Figure 30 is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 7.
Figure 31 is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 7.
Figure 32 is the action flow chart of the mobile station apparatus that relates to of execution mode 7.
Figure 33 is the transmission frame format of the base station apparatus that relates to of execution mode 8.
Figure 34 is the action flow chart of the base station apparatus that relates to of execution mode 8.
Figure 35 is the figure of action of the Cell searching of the mobile station apparatus that relates to of expression execution mode 8.
Figure 36 is the action flow chart of the mobile station apparatus that relates to of execution mode 8.
Embodiment
Below, at embodiments of the present invention, be described in detail with reference to accompanying drawing.Each execution mode shown below is cut down the operand of second stage (frame regularly detects and handles and code group detection processing) in the Cell searching that is made of first～phase III.
(execution mode 1)
As shown in Figure 3, the mobile body communication system of present embodiment has base station apparatus 100 and mobile station apparatus 200.And, receive from the sub-district 1 or the signal that sends of the base station apparatus 100 of sub-district 2 by mobile radio station 200, based on this received signal, mobile station apparatus 200 carries out Cell searching.
Fig. 4 is the transmission frame format of base station apparatus 100.In the past, pilot frequency code element is a kind, with respect to this in the present embodiment, is used to detect frame pilot frequency code element regularly and these the two kinds of pilot frequency code elements of pilot frequency code element that are used to detect code group.As shown in Figure 4, these two kinds of pilot frequency code elements alternately insert frame boundaries at time-axis direction respectively in per two frames.That is, be used to detect frame code element regularly and on time shaft, be disposed at different positions with the code element that is used to detect code group.Detect frame pilot frequency code element regularly for being used to, use the adjacent pilot frequencies code element that not multiply by the code group sequence.That is, the pilot frequency code element of same sequence is adjacent to be configured in frame boundaries as being used to detect frame code element regularly.In addition, the pilot frequency code element that is used to detect code group has and in the past the identical structure of pilot frequency code element.In the adjacent pilot frequencies code element, only to the pilot frequency code element at frame end, per two frames multiply by the code group sequence.
The structure of the base station apparatus 100 of present embodiment then, is described.As shown in Figure 5, base station apparatus 100 has: coding unit 101, encode to sending data; Modulating unit 102 is modulated the data behind the coding; Frame constitutes unit 103, by data and the pilot signal configuration frame after the modulation; Code group multiplication unit 105 multiply by the code group sequence of selecting from code group memory cell 104 at specific pilot frequency code element or specific data symbols; Scrambler unit 107 all multiply by the scrambler of selecting from scrambler memory cell 106 on the code element; S/P unit 108 carries out serial-parallel conversion to the code-element string that multiply by scrambler; The IFFT processing is implemented to being transformed into parallel code-element string in IFFT unit 109; GI inserts unit 110, and insertion protection interval in the OFDM code element (multi-carrier signal) that generates by IFFT (guard interval, GI); And wireless transmission unit 111, the OFDM code element behind the insertion GI is sent to mobile station apparatus 200 via antenna 112.
Then, use the flow chart of Fig. 6 that the frame formation unit 103 of base station apparatus 100 and the action of code group multiplication unit 105 are described, ST (step) 401～407th, frame constitutes the processing in the unit 103, ST408～413rd, the processing in the code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame via the transmission data of modulating unit 102 modulation and pilot signal as input, to be unit carry out buffer memory (ST401) respectively to the data of number of subcarriers and pilot signal handles with the 1OFDM code element.Then, OFDM symbol number i is resetted (ST402).To be made as N as if the OFDM code element number of each frame
Symbol, so at OFDM symbol number i (modN
Symbol)=0 or N
Symbol-1 o'clock (ST403: be) just constitutes the pilot frequency code element (ST404) that the 1OFDM code elements are exported in unit 103 from frame.On the other hand, (ST403: not), then constitute the data (ST405) of unit 103 output 1OFDM code elements when not being i (modNsymbol)=0 or Nsymbol-1 from Frame.And, with i＜2N
SymbolBe condition, establish i=i+1 (that is, the quantity of 2 frames), carry out the processing (ST406, ST407) of ST403～ST405 repeatedly.
When to each frame of ofdm signal with k=0,1, when numbering (ST408, ST413) for order assignment, (ST409: not) under the situation that is not k=0, pilot frequency code element to the frame end in the output signal of frame formation unit 103, multiply by the code group sequence of from the code group sequence of code group memory cell 104 storages, selecting (ST410), and from 105 outputs (ST411) of code group multiplication unit.Under the situation of k=0 (ST409: be), frame is constituted the output signal of unit 103 intactly from 105 outputs (ST411) of code group multiplication unit.And, be condition with k＜2, establish k=k+1, carry out the processing of ST409～ST411 repeatedly.By this processing, in code group multiplication unit 105, the pilot frequency code element at the frame end of per 2 frames is multiplied by the code group sequence.Its result, the structure of the frame of output such as above-mentioned shown in Figure 4.And, comprise and thisly be used to detect the frame that frame pilot tone and being used to regularly detects the pilot tone of code group and send to mobile station apparatus 200 by wireless transmission unit 111.
The structure of mobile station apparatus 200 then, is described.As shown in Figure 7, the mobile station apparatus of present embodiment has: radio receiving unit 602 receives the OFDM code element of sending from base station apparatus 100 via antenna 601; FFT is detecting unit 603 regularly, detects the symbol timing of FFT and exports FFT regularly; GI removes unit 604, removes GI from the OFDM code element; FFT unit 605 is implemented FFT to the OFDM code element and is handled; Frame is detecting unit 606 regularly, detects frame timing and output frame timing information; Code group memory cell 607, storage candidate code group sequence; Code group detecting unit 608 detects code group and exports code group information; Scrambler memory cell 609, the storage candidate scramble code; Scrambler discrimination unit 610 is distinguished scrambler and output code information; Descrambling unit 611 uses the scrambler that picks out to carry out descrambling to received signal; Channel estimating unit 612 is carried out the channel estimating of received signal; Demodulating unit 613 carries out demodulation to received signal; Decoding unit 614 is to being decoded by the signal of demodulation.
Then, the action to mobile station apparatus 200 describes.The Cell searching that carries out at mobile station apparatus 200 is distinguished into the processing of phase I～phase III, regularly detecting unit 603, GI remove the processing of carrying out the phase I in unit 604 and the FFT unit 605 at FFT, in frame timing detecting unit 606, code group memory cell 607 and code group detecting unit 608, carry out the processing of second stage, in scrambler memory cell 609 and scrambler discrimination unit 610, carry out the processing of phase III.
In mobile station apparatus 200, the OFDM code element that is received by radio receiving unit 602 via antenna 601 is imported into regularly detecting unit 603 of FFT, as the phase I, and regularly detecting unit 603 detected symbol timing of FFT.
As second stage, based at detected symbol timing of phase I, frame regularly detecting unit 606 and code group detecting unit 608 carries out the detection of frame timing detection and code group respectively shown in Fig. 8 A and Fig. 8 B.Details about the processing of second stage will be narrated in the back.
The OFDM code element is removed unit 604 at GI and is removed GI according at detected symbol timing of phase I, and 605 carry out the FFT processing in the FFT unit.Then, extract the candidate scramble code that belongs in the detected code group of second stage,, distinguish scrambler by related operation as the phase III from scrambler memory cell 609.Then, use the scrambler that picks out, carry out descrambling in descrambling unit 611 to received signal.
Below, the flow chart of use Fig. 9 illustrates the detailed treatment step of second stage.
＜frame timing detection: Fig. 8 A 〉
At first, according at FFT timing detecting unit 603 detected symbol timings, carry out adjacent code element i, the related operation between the i+1 (ST101, ST102) at frame timing detecting unit 606.Work as N=2N
SymbolThe time, if code element i is i＜2N
Symbol(ST103: be) then establishes i=i+1 (ST104), turns back to ST102, if not i＜2N
Symbol(ST103: not), then will be maximum adjacent code element i at the correlation that ST102 obtains, the border of i+1 is as frame timing (ST105).
In addition, need not to use as shown in Figure 7 the signal that carries out behind the FFT to detect frame regularly, and use the signal that carries out before the FFT also can detect frame regularly as shown in Figure 10, thus, related operation between adjacent code element need not each subcarrier is carried out, and can carry out with the OFDM symbol unit.
The detection of＜code group: Fig. 8 B 〉
Owing to dispose the pilot frequency code element that is used to detect code group at the next frame boundaries that is inserted with the frame boundaries that is used to detect frame pilot frequency code element regularly, so based at the detected frame of ST105 regularly, code group detecting unit 608 is identified for detecting the position (ST106) of the pilot frequency code element of code group.After determining,,, extract code group sequence (ST107) by between adjacent code element, carrying out the complex conjugate multiplication computing at the pilot frequency code element that is used for detecting code group.And, the related operation (ST108) of the code group sequence that extracts and candidate's code group, the candidate that will have maximum related value is as code group sequence (ST109).
Like this, according to present embodiment, because frame is regularly detected processing to be separated with code group detection processing, after the frame timing detection is handled, determined multiply by the symbol timing of code group sequence, only the detection of carrying out code group with this symbol timing is handled, detect and handle so do not need that whole code elements are carried out code group, and the operand of the second stage that can reduce Cell searching in handling.
(execution mode 2)
Figure 11 is the transmission frame format of the base station apparatus 100 of present embodiment.Setting detects the pilot frequency code element of frame timing with identical being used to of using at execution mode 1 and detects the data of code group again in shown below being used to.As shown in figure 11, will be disposed at the follow-up adjacent code element of this data symbols in the code element that certain data symbols multiply by the code group sequence, as the data that are used to detect code group.That is, one of them adjacent on time shaft data symbols be multiply by the code group sequence, and, be used to detect frame code element regularly and on time shaft, be disposed at different positions with the code element that is used to detect code group.
The structure of the base station apparatus 100 that present embodiment relates to is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103 and code group multiplication unit 105.Below, use the flow chart of Figure 12 that the frame formation unit 103 of present embodiment and the action of code group multiplication unit 105 are described.ST501～ST509 is the processing in frame formation unit 103, and ST510～ST515 is the processing in code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame by the transmission data of modulating unit 102 modulation and pilot signal as input, with number of sub be N code element as the 1OFDM symbol unit, logarithm reaches pilot signal according to this and carries out buffer memory (ST501).Then, OFDM symbol number i is resetted (ST502).If the OFDM code element number of each frame is made as N
Symbol, so at OFDM symbol number i=0 or N
SymbolUnder-1 the situation (ST503: be), just constitute the pilot frequency code element (ST505) of unit 103 output 1OFDM code elements from frame.On the other hand, not i=0 or N
Symbol(ST503: not), then enter into ST504 under-1 the situation.And, under the situation (ST504: be) of i=Nt (Nt be not 1 but certain established data symbol number), constitute the unit 103 outputs data (ST506) identical with preceding data symbols from frame.On the other hand, (ST504: not), then constitute the data (ST507) of unit 103 output 1OFDM code elements under the situation that is not i=Nt from frame.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST508, ST509) of ST503～ST507 repeatedly.
Back (ST510) once more resets OFDM symbol number i, frame constitutes the output signal (ST511: be) under the situation of symbol number i=Nt of unit 103, on data symbols, multiply by the code group sequence of from the code group sequence that code group memory cell 104 is stored, selecting (ST512), and from 105 outputs (ST513) of code group multiplication unit.(ST511: not), frame is constituted the output signal of unit 103 intactly from 105 outputs (ST513) of code group multiplication unit under the situation that is not i=Nt.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST514, ST515) of ST511～ST513 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 11.And, comprise such being used to and detect the frame that frame pilot tone and being used to regularly detects the data of code group and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7, Figure 10).But, the processing difference of the second stage of Cell searching.Below, use Figure 13 A, Figure 13 B that the processing of the second stage of present embodiment is described.In addition, the motion flow of second stage is identical with execution mode 1 (Fig. 9).
＜frame timing detection: Figure 13 A 〉
At first, according at FFT timing detecting unit 603 detected symbol timings, carry out adjacent code element i, the related operation between the i+1 (ST101, ST102) at frame timing detecting unit 606.Work as N=N
SymbolThe time, if code element i is i＜N
Symbol(ST103: be) then establishes i=i+1 (ST104), turns back to ST102, if not i＜N
Symbol(ST103: not), then will be maximum adjacent code element i at the correlation that ST102 obtains, the border of i+1 is as frame timing (ST105).
The detection of＜code group: Figure 13 B 〉
According at the detected frame of ST105 regularly, code group detecting unit 608 is identified for detecting the position (ST106) of the data symbols of code group.After determining,,, extract code group sequence (ST107) by between adjacent code element, carrying out the complex conjugate multiplication computing in the data symbols that is used for detecting code group.And, the related operation (ST108) of the code group sequence of extracting and candidate's code group, the candidate that will have maximum related value is as code group sequence (ST109).
Like this, according to present embodiment, regularly detect and handle and code group detects and handles owing in 1 frame, carry out frame, so can further be reduced in operand in the second stage processing of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.
(execution mode 3)
Figure 14 is the transmission frame format of the base station apparatus 100 of present embodiment.Setting detects the pilot frequency code element of frame timing with identical being used to of using and detects the data of code group again in shown below being used in execution mode 1.As shown in figure 14, to on the next pilot frequency code element adjacent, multiply by the result of code group sequence at the pilot frequency code element (being used for detecting frame pilot frequency code element regularly) of the adjacent same sequence of frame boundaries on time shaft as the pilot frequency code element that is used to detect code group with the pilot frequency code element of frame beginning.
The structure of the base station apparatus 100 of present embodiment is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103 and code group multiplication unit 105.Below, use the flow chart of Figure 15 that the frame formation unit 103 of present embodiment and the action of code group multiplication unit 105 are described.ST601～ST609 is the processing in frame formation unit 103, and ST610～ST615 is the processing in code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame by the transmission data of modulating unit 102 modulation and pilot signal as input, with number of sub be N code element as the 1OFDM symbol unit, logarithm reaches pilot signal according to this and carries out buffer memory (ST601).Then, OFDM symbol number i is resetted (ST602).If the OFDM code element number of each frame is made as N
Symbol, under the situation of OFDM symbol number i=0 or Nsymbol-1 (ST603: be) so just constitutes the pilot frequency code element (ST605) that the 1OFDM code elements are exported in unit 103 from frame.On the other hand, not i=0 or N
Symbol(ST603: not), then enter into ST604 under-1 the situation.And, under the situation of i=1 (ST604: be), constitute the unit 103 outputs data (ST606) identical with preceding pilot frequency code element from frame.On the other hand, (ST604: not), then constitute the data (ST607) of unit 103 output 1OFDM code elements under the situation that is not i=1 from frame.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST608, ST609) of ST603～ST607 repeatedly.
Back (ST610) once more resets OFDM symbol number i, frame constitutes the output signal (ST611: be) under the situation of symbol number i=1 of unit 103, on pilot frequency code element, multiply by the code group sequence of from the code group sequence that code group memory cell 104 is stored, selecting (ST612), and from 105 outputs (ST613) of code group multiplication unit.(ST611: not), frame is constituted the output signal of unit 103 intactly from 105 outputs (ST613) of code group multiplication unit under the situation that is not i=1.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST614, ST615) of ST611～ST613 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 14.And, comprise such being used to and detect the frame that frame pilot tone and being used to regularly detects the pilot tone of code group and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7, Figure 10).But, the processing difference of the second stage of Cell searching.Below, use Figure 16 A, Figure 16 B that the processing of the second stage of present embodiment is described.In addition, the motion flow of second stage is identical with execution mode 1 (Fig. 9).
＜frame timing detection: Figure 16 A 〉
At first, according at FFT timing detecting unit 603 detected symbol timings, carry out adjacent code element i, the related operation between the i+1 (ST101, ST102) at frame timing detecting unit 606.Work as N=N
SymbolThe time, if code element i is i＜N
Symbol(ST103: be) then establishes i=i+1 (ST104), turns back to ST102, if not i＜N
Symbol(ST103: not), then will be maximum adjacent code element i at the correlation that ST102 obtains, the border of i+1 is as frame timing (ST105).
The detection of＜code group: Figure 16 B 〉
According at the detected frame of ST105 regularly, code group detecting unit 608 is identified for detecting the position (ST106) of the pilot frequency code element of code group.After determining,,, extract code group sequence (ST107) by between adjacent code element, carrying out the complex conjugate multiplication computing at the pilot frequency code element that is used for detecting code group.And, the related operation (ST108) of the code group sequence of extracting and candidate's code group, the candidate that will have maximum related value is as code group sequence (ST109).
Like this, according to present embodiment, regularly detect and handle and code group detects processing owing in 1 frame, carry out frame, so can further be reduced in operand in the processing of second stage of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.
(execution mode 4)
Figure 17 is the transmission frame format of the base station apparatus 100 of present embodiment.In the present embodiment, shown below being used to is set and detects the pilot frequency code element that code group is used for the timing of detection frame.As shown in figure 17, to be divided into two in the frequency axis direction at the subcarrier of the adjacent pilot frequency code element of frame boundaries, the result who multiply by same code group sequence on the pilot frequency code element at both sides' that will be after cutting apart frame end is used for and detects frame pilot frequency code element regularly as being used to detect code group.That is, the pilot frequency code element at frame beginning and frame end is divided into two on frequency axis, allows the pilot frequency code element of the both sides after cutting apart multiply by identical code group sequence at the frame end.
The structure of the base station apparatus 100 that present embodiment relates to is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103 and code group multiplication unit 105.Below, use the flow chart of Figure 18 that the frame formation unit 103 of present embodiment and the action of code group multiplication unit 105 are described.ST701～ST707 is the processing in frame formation unit 103, and ST708～ST713 is the processing in code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame by the transmission data of modulating unit 102 modulation and pilot signal as input, with number of sub be N code element as the 1OFDM symbol unit, logarithm reaches pilot signal according to this and carries out buffer memory (ST701).Then, OFDM symbol number i is resetted (ST702).If the OFDM code element number of each frame is made as N
Symbol, so at OFDM symbol number i=0 or N
SymbolUnder-1 the situation (ST703: be), just constitute the pilot frequency code element (ST704) of unit 103 output 1OFDM code elements from frame.On the other hand, not i=0 or N
Symbol(ST703: not), then constitute the data (ST705) of unit 103 output 1OFDM code elements under-1 the situation from frame.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST706, ST707) of ST703～ST705 repeatedly.
Back (ST708) once more resets OFDM symbol number i, frame constitutes the output signal (ST709: be) under the situation of symbol number i=0 of unit 103, with subcarrier unit the output signal that frame constitutes unit 103 is divided into two, on both sides' pilot frequency code element, multiply by the code group sequence of from the code group sequence that code group memory cell 104 is stored, selecting (ST710), and from 105 outputs (ST711) of code group multiplication unit.Under the situation that is not i=0 (ST709: not), from code group multiplication unit 105 intactly output frame constitute the output signal (ST711) of unit 103.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST712, ST713) of ST709～ST711 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 17.And, comprise such being used to and detect code group and be used for the frame that detects frame pilot tone regularly and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7).But, the processing difference of the second stage of Cell searching.Below, use Figure 19 A, Figure 19 B and Figure 20 that the processing of the second stage of present embodiment is described.
＜frame timing detection: Figure 19 A 〉
At first, according at FFT detecting unit 603 detected symbol timings regularly, frame timing detecting unit 606 is by being divided into two pilot frequency code element on frequency axis with subcarrier unit, between the adjacent respectively code element of frame boundaries, carry out the complex conjugate multiplication computing, extract two sequences (ST201, ST202).And, between the code group sequence of extracting, carry out related operation (ST203).If N=N
SymbolThe time, if code element i is i＜N
Symbol(ST204: be) then establishes i=i+1 (ST205), turns back to ST202, if not i＜N
Symbol(ST204: not), then will be maximum adjacent code element i at the correlation that ST203 obtains, the border of i+1 is as frame timing (ST206).
The detection of＜code group: Figure 19 B 〉
Two code group sequences (abstraction sequence 1,2) that calculating is extracted at ST202 and candidate's code group sequence relevant, and addition (ST207), the candidate who with addition result is maximum correlation value is as code group sequence (ST208).
Like this, according to present embodiment, regularly detect and handle and code group detects and handles owing in 1 frame, carry out frame, so can further be reduced in operand in the second stage processing of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.
(execution mode 5)
Under the situation of execution mode 4, if as the structure of above-mentioned pilot frequency code element shown in Figure 17, in the big propagation path characteristic of the frequency variation that causes by frequency selective attenuation, be divided into two the code group sequence between can not get high correlation when carrying out related operation, and frame timing detection precision can worsen.
Therefore, in the present embodiment, as shown in figure 21, the influence by the frame structure that adopts at the different pilot frequency code element of frequency axis direction alternate configurations alleviates frequency variation improves the precision that frame regularly detects.In addition, in the present embodiment, alternately multiply by the code group sequence on the different pilot frequency code element of configuration on the frequency axis at frame end.
The structure of the base station apparatus 100 of present embodiment is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103 and code group multiplication unit 105.Below, use the flow chart of Figure 22 that the frame formation unit 103 of present embodiment and the action of code group multiplication unit 105 are described.ST801～ST807 is the processing in frame formation unit 103, and ST808～ST813 is the processing in code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame by the transmission data of modulating unit 102 modulation and pilot signal as input, with number of sub be N code element as the 1OFDM symbol unit, logarithm reaches pilot signal according to this and carries out buffer memory (ST801).Then, OFDM symbol number i is resetted (ST802).If the OFDM code element number of each frame is made as N
Symbol, under the situation of OFDM symbol number i=0 or Nsymbol-1 (ST803: be) so just constitutes the pilot frequency code element (ST804) that the 1OFDM code elements are exported in unit 103 from frame.On the other hand, not i=0 or N
Symbol(ST803: not), then constitute the data (ST805) of unit 103 output 1OFDM code elements under-1 the situation from frame.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST806, ST807) of ST803～ST805 repeatedly.
Back (ST808) once more resets OFDM symbol number i, frame constitutes the output signal (ST809: be) under the situation of symbol number i=0 of unit 103, on subcarrier, alternately multiply by the same code group sequence (ST810) of the code group sequence selection of being stored from code group memory cell 104, and from 105 outputs (ST811) of code group multiplication unit.Under the situation that is not i=0 (ST809: not), from code group multiplication unit 105 intactly output frame constitute the output signal (ST811) of unit 103.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST812, ST813) of ST809～ST811 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 21.And, comprise such being used to and detect code group and be used for the frame that detects frame pilot tone regularly and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7).But, the processing difference of the second stage of Cell searching.Below, use Figure 23 that the processing of the second stage of present embodiment is described.In addition, the motion flow of the detection of code group and second stage is identical with execution mode 4 (Figure 19 B, Figure 20).
＜frame timing detection: Figure 23 〉
At first,,,, between adjacent respectively code element, carry out the complex conjugate multiplication computing, extract two sequences (ST201, ST202) by alternately taking out subcarrier at frame timing detecting unit 606 according at FFT timing detecting unit 603 detected symbol timings.
And, will carry out related operation (ST203) between the code group sequence of extracting.Work as N=N
SymbolThe time, if code element i is i＜N
Symbol(ST204: be) then establishes i=i+1 (ST205), turns back to ST202, if not i＜N
Symbol(ST204: not), the adjacent code element i of the correlation maximum that will obtain at ST203 then, the border of i+1 is as frame regularly (ST206).
Like this, according to present embodiment, regularly detect and handle and code group detects processing owing in 1 frame, carry out frame, so can further be reduced in operand in the processing of second stage of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.In addition and execution mode 4 compare, can improve the ability of the big propagation path characteristic of frequency variation that antagonism causes by frequency selective attenuation etc.
(execution mode 6)
Figure 24 is the transmission frame format of the base station apparatus 100 of present embodiment.In the present embodiment, shown below being used to is set and detects the pilot frequency code element that code group is used for the timing of detection frame.As shown in figure 24, will be divided into the subcarrier block of code group quantity at whole subcarriers of the adjacent pilot frequency code element of frame boundaries in the frequency axis direction.The result who multiply by the code group sequence on the subcarrier block corresponding with the code group numbering that will carry out at the frame end is used for the pilot frequency code element that detects the frame timing as being used to detect code group.
The structure of the base station apparatus 100 of present embodiment is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103 and code group multiplication unit 105.Below, use the flow chart of Figure 25 that the frame formation unit 103 of present embodiment and the action of code group multiplication unit 105 are described.ST901～ST907 is the processing in frame formation unit 103, and ST908～ST913 is the processing in code group multiplication unit 105.
In base station apparatus 100, will constitute in the unit 103 at frame by the transmission data of modulating unit 102 modulation and pilot signal as input, with number of sub be N code element as the 1OFDM symbol unit, logarithm reaches pilot signal according to this and carries out buffer memory (ST901).Then, OFDM symbol number i is resetted (ST902).If establishing the OFDM code element number of each frame is N
Symbol, so at OFDM symbol number i=0 or N
SymbolUnder-1 the situation (ST903: be), just constitute the pilot frequency code element (ST904) of unit 103 output 1OFDM code elements from frame.On the other hand, not i=0 or N
Symbol(ST903: not), then constitute the data (ST905) of the pilot frequency code element of unit 103 output 1OFDM code elements under-1 the situation from frame.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST906, ST907) of ST903～ST905 repeatedly.
Back (ST908) once more resets OFDM symbol number i, frame constitutes the output signal (ST909: be) under the situation of symbol number i=0 of unit 103, all subcarriers are divided into the subcarrier block of suitable code character quantity, on the subcarrier block corresponding, multiply by code group sequence (normally same sequence) that code group memory cell 104 stored (ST910) with the code group number, and from the result (ST911) of code group multiplication unit 105 output multiplications.Under the situation that is not i=0 (ST909: not), from code group multiplication unit 105 intactly output frame constitute the output signal (ST911) of unit 103.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST912, ST913) of ST909～ST911 repeatedly.Its result, the frame structure of being exported such as above-mentioned shown in Figure 24.And, comprise such being used to and detect being used for of code group and detect the frame of frame pilot tone regularly and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7).But, the processing difference of the second stage of Cell searching.Below, use Figure 26 A, Figure 26 B and Figure 27 that the processing of the second stage of present embodiment is described.
＜frame timing detection: Figure 26 A 〉
At first, according at FFT timing detecting unit 603 detected symbol timings, carry out adjacent i, the related operation between the i+1 (ST301, ST302) at frame timing detecting unit 606.If N=N
Symbol, if code element i is i＜N
Symbol(ST303: be) then establishes i=i+1 (ST304), turns back to ST302, if not i＜N
Symbol(ST303: not), then will be maximum adjacent code element i at the correlation that ST302 obtains, the border of i+1 is as frame timing (ST305).
The detection of＜code group: Figure 26 B 〉
According at the detected frame of ST305 regularly, code group detecting unit 608 carries out related operation (ST306) between adjacent code element at the frame boundaries of each subcarrier block.From having the subcarrier block position probing code group sequence (ST307) of minimum correlation value.
Like this, according to present embodiment, regularly detect and handle and code group detects processing owing in 1 frame, carry out frame, so can further be reduced in operand in the processing of second stage of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.
(execution mode 7)
Figure 28 is the transmission frame format of the base station apparatus 100 of present embodiment.In the present embodiment, shown below being used to is set and detects the pilot frequency code element that code group is used for the timing of detection frame.As shown in figure 28, will be divided into two the same pilot frequency sequence (P of configuration on the subcarrier of the both sides after cutting apart at the subcarrier of the adjacent pilot frequency code element of frame boundaries in the frequency axis direction
1～P
N/2), will be in the pilot frequency code element at frame end, those same pilot frequency sequence (P
1～P
N/2) multiply by same code group sequence (C
1～C
N/2) result (P
1'～P
N/2') be used for the pilot frequency code element that detects the frame timing as being used to detect code group.That is, the subcarrier at frame beginning and frame end is divided into two, disposes same pilot frequency sequence (P both sides
1～P
N/2), allow both sides' same pilot frequency sequence (P at the frame end
1～P
N/2) multiply by same code group sequence (C
1～C
N/2).
The structure of the base station apparatus 100 of present embodiment is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103, code group multiplication unit 105 and scrambler unit 107.Below, the flow chart of use Figure 29 describes the action of frame formation unit 103, code group multiplication unit 105 and the scrambler unit 107 of present embodiment.ST1001～1007th, the processing in frame formation unit 103, ST1008～1013rd, the processing in code group multiplication unit 105, ST1014～1020th, the processing in scrambler unit 107.
In base station apparatus 100, will be by the transmission data of modulating unit 102 modulation and pilot signal as input, constitute in the unit 103 at frame, data that are equivalent to whole number of subcarriers (1OFDM code element amount) and the pilot signal that is equivalent to half quantity of whole subcarriers are carried out buffer memory (ST1001).Then, OFDM symbol number i is resetted (ST1002).If the OFDM code element number of each frame is N
SymbolUnder the situation of OFDM symbol number i=0 or Nsymbol-1 (ST1003: be) so, subcarrier is divided into two in the frequency axis direction, the same pilot frequency sequence of configuration on the subcarrier of the both sides after cutting apart, and from 03 output (ST1004) of frame formation unit.On the other hand, (ST1003: not), constitute the data (ST1005) of unit 103 output 1OFDM code elements from frame under the situation that is not i=0 or Nsymbol-1.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST1006, ST1007) of ST1003～ST1005 repeatedly.
Back (ST1008) once more resets OFDM symbol number i, frame constitutes the output signal (ST1009: be) under the situation of symbol number i=0 of unit 103, the output signal that frame is constituted unit 103 is divided into two with subcarrier unit, multiply by the same code group sequence of from the code group sequence that code group memory cell 104 is stored, selecting (ST1010) on the pilot frequency code element of both sides after being divided into two, and from 105 outputs (ST1011) of code group multiplication unit.Under the situation that is not i=0 (ST1009: not), from code group multiplication unit 105 intactly output frame constitute the output signal (ST1011) of unit 103.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST1012, ST1013) of ST1009～ST1011 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 28.
Then, the back (ST1014) that once more OFDM symbol number i resetted, the output signal of code group multiplication unit 105 is at symbol number i=0 or N
SymbolUnder-1 the situation (ST1015: be), on the both sides' that are divided into two with subcarrier unit pilot frequency code element, multiply by corresponding with half quantity of whole subcarriers respectively same scrambler (ST1016), and 107 outputs (ST1018) from the scrambler unit.On the other hand, not i=0 and N
SymbolUnder-1 the situation (ST1015: not), on code element, multiply by scrambler (ST1017), and 107 outputs (ST1018) from the scrambler unit.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST1019, ST1020) of ST1015～ST1018 repeatedly.And, comprise such being used to and detect being used for of code group and detect the frame of frame pilot tone regularly and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7).But, the processing difference of the second stage of Cell searching.Below, use the processing of the second stage of Figure 30～32 pair present embodiment to describe.
＜frame timing detection: Figure 30 〉
At first, according at FFT detecting unit 603 detected symbol timings regularly, frame timing detecting unit 606 is by being divided into two pilot frequency code element with subcarrier unit on frequency axis, between the subcarrier of the identical frequency band between the adjacent respectively code element of frame boundaries, carry out the complex conjugate computing, extract two sequences.In addition, frame timing detecting unit 606 extracts two sequences again by carry out the complex conjugate computing between the subcarrier of the different frequency bands between the adjacent respectively code element of frame boundaries.So, frame timing detecting unit 606 extracts 4 sequences (ST1101, ST1102).Then, synthetic 4 code group sequences (ST1103) of extracting.If N=N
Symbol, if code element i is i＜N
Symbol(ST1104: be) then establishes i=i+1 (ST1105), turns back to ST1102.If not i＜N
Symbol(ST1104: not), then will be maximum adjacent code element i at the composite value that ST1103 obtains, the border of i+1 is as frame timing (ST1106).
Synthetic being meant here in 4 code group sequences extracting, carried out related operation between per two sequences, with two correlation additions that obtain, perhaps in 4 code group sequences extracting, carry out the homophase addition between per two sequence, being correlated with between two sequences that the calculating addition obtains.
The detection of＜code group: Figure 31 〉
Relevant and the addition (ST1107) of 4 code group sequences (abstraction sequence 1～4) that calculating extracts at ST1102 and candidate's code group sequence is that the candidate of maximum correlation value is as code group sequence (ST1108) with the result of addition.In addition, in ST1107, also can carry out the homophase addition, calculate the relevant of sequence after the addition and candidate's code group sequence 4 code group sequences extracting.
Like this, according to present embodiment, regularly detect and handle and code group detects and handles owing in a frame, carry out frame, so more can be reduced in the operand of processing of the second stage of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.In addition, owing to will be divided into two in the frequency axis direction at the subcarrier of the adjacent pilot frequency code element of frame boundaries, the same pilot frequency sequence of configuration on the subcarrier of both sides after cutting apart, therefore, in the frame timing detection is handled, be not only identical frequency band, also can carry out complex conjugate computing between the adjacent code element at different frequency bands, and can increase the quantity (that is, becoming the quantity of the sampling of synthetic object) of extractible code group sequence.For example and execution mode 4 compare, the quantity of extractible code group sequence is twice, that is, the hits of related operation is a twice.Like this, owing to can obtain bigger correlation, therefore can improve frame regularly accuracy of detection and code group accuracy of detection.
In addition, in the present embodiment, on adjacent sub-carriers, dispose two same pilot frequency sequences and two same code group sequences respectively, but, also can dispose same pilot frequency sequence more than 3 and the same code group sequence more than 3.
In addition, in the present embodiment, because the length of the scrambler that multiply by on pilot tone is whole number of subcarriers half, therefore the length of distinguishing in the processing too the scrambler that will use at the scrambler of phase III is decided to be half.
(execution mode 8)
Under the situation of execution mode 7, if as during the structure of above-mentioned pilot frequency code element shown in Figure 28, in the big propagation path characteristic of the frequency variation that causes by frequency selective attenuation, can not get high correlation during relevant between the code group sequence that calculating is divided into two, and frame timing detection precision can worsen.Therefore, in the present embodiment, as shown in figure 33, alternately dispose same pilot frequency code element (P in per two of frequency axis direction by adopting
1, P
1, P
2, P
2..., P
N/2, P
N/2, wherein, P
1, P
2..., P
N/2Be respectively different pilot frequency code elements) frame structure, thereby the influence that alleviates frequency variation improves the precision that frame regularly detects.In addition, in the present embodiment, allow on the frequency axis at frame end per two alternately the configuration same pilot frequency code elements multiply by same code group sequence respectively.
The structure of the base station apparatus 100 of present embodiment is identical with execution mode 1 (Fig. 5).But frame constitutes the action difference of unit 103, code group multiplication unit 105 and scrambler unit 107.Below, the flow chart of use Figure 34 describes the action of frame formation unit 103, code group multiplication unit 105 and the scrambler unit 107 of present embodiment.ST1201～ST1207 is the processing in frame formation unit 103, and ST1208～ST1213 is the processing in code group multiplication unit 105, and ST1214～ST1220 is the processing in scrambler unit 107.
In base station apparatus 100, will be by the transmission data of modulating unit 102 modulation and pilot signal as input, in frame constitutes unit 103, to the data of quite whole number of subcarriers (1OFDM code element amount) and quite all the pilot signal of half quantity of subcarriers carry out buffer memory (ST1201).Then, OFDM symbol number i is resetted (ST1202).If the OFDM code element number of each frame is made as N
SymbolThe time, under the situation of OFDM symbol number i=0 or Nsymbol-1 (ST1203: be) so just is configured in per two the same pilot signals that replace on the subcarrier and constitutes unit 103 from frame and export (ST1204).On the other hand, not i=0 or N
Symbol(ST1203: not), then constitute the data (ST1205) of unit 103 output 1OFDM code elements under-1 the situation from frame.And, be condition with i＜Nsymbol, establish i=i+1, carry out the processing (ST1206, ST1207) of ST1203～ST1205 repeatedly.
Back (ST1208) once more resets OFDM symbol number i, frame constitutes the output signal (ST1209: be) under the situation of symbol number i=0 of unit 103, for per two pilot frequency code elements that alternately dispose on subcarrier, allow it alternately multiply by the same code group sequence of from the code group sequence that code group memory cell 104 is stored, selecting (ST1210), and from 105 outputs (ST1211) of code group multiplication unit.Under the situation that is not i=0 (ST1209: not), then from code group multiplication unit 105 intactly output frame constitute the output signal (ST1211) of unit 103.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST1212, ST1213) of ST1209～ST1211 repeatedly.Its result, the structure of the frame of being exported such as above-mentioned shown in Figure 33.
Then, the back (ST1214) that once more OFDM symbol number i resetted, the output signal of code group multiplication unit 105 is at symbol number i=0 or N
SymbolUnder-1 the situation (ST1215: be), for per two pilot frequency code elements that alternately dispose on subcarrier, allow its alternately multiply by the length of selecting from scrambler memory cell 106 be scrambler half two same sequences (first half of scrambler half or latter half half can) (ST1216), and 107 outputs (ST1218) from the scrambler unit.On the other hand, not i=0 and N
SymbolUnder-1 the situation (ST1215: not), on code element, multiply by scrambler (ST1217), and 107 outputs (ST1218) from the scrambler unit.And, with i＜N
SymbolBe condition, establish i=i+1, carry out the processing (ST1219, ST1220) of ST1215～ST1218 repeatedly.And, comprise such being used to and detect code group and be used for the frame that detects frame pilot tone regularly and sent to mobile station apparatus 200 by wireless transmission unit 111.
Then, the action to the mobile station apparatus 200 of present embodiment describes.The structure of mobile station apparatus 200 is identical with execution mode 1 (Fig. 7).But, the processing difference of the second stage of Cell searching.Below, use Figure 35, Figure 36 that the processing of the second stage of present embodiment is described.In addition, about the detection of code group, since identical with execution mode 7, the Therefore, omited explanation.
＜frame timing detection: Figure 35 〉
At first, according at FFT detecting unit 603 detected symbol timings regularly, frame regularly detecting unit 606 carries out the complex conjugate computing by alternately taking out subcarrier per two of frequency axis between the subcarrier of the same frequency between the adjacent respectively code element, extract two sequences.In addition, frame regularly detecting unit 606 carries out the complex conjugate computing between the subcarrier of the different frequency between the adjacent respectively code element, extract two sequences again.So, frame timing detecting unit 606 extracts 4 sequences (ST1301, ST1302).Then, synthetic 4 code group sequences (ST1303) of extracting.If N=N
Symbol, if code element i is i＜N
Symbol(ST1304: be) then establishes i=i+1 (ST1305), turns back to ST1102.If not i＜N
Symbol(ST1304: not), then will be maximum adjacent code element i at the composite value that ST203 obtains, the border of i+1 is as frame timing (ST1306).
Same with execution mode 7, synthetic being meant here, in 4 code group sequences extracting, carry out related operation between per two sequences, with two correlation additions that obtain, perhaps in 4 code group sequences extracting, carry out the homophase addition between per two sequence, being correlated with between two sequences that the calculating addition obtains.
Like this, according to present embodiment, regularly detect and handle and code group detects and handles owing in a frame, carry out frame, so more can be reduced in the operand of processing of the second stage of Cell searching, and can shorten the Cell searching time, so can carry out Cell searching more at a high speed.And, owing to alternately dispose same pilot frequency code element in per two of frequency axis direction, therefore, in the frame timing detection is handled, be not only same frequency, also can carry out complex conjugate computing between the adjacent code element at different frequency, therefore can increase the quantity (that is, becoming the quantity of the sampling of synthetic object) of extractible code group sequence.For example and execution mode 4 compare, the quantity of extractible code group sequence is twice, that is, the hits of related operation is a twice.Like this, owing to can obtain bigger correlation, therefore can improve frame regularly accuracy of detection and code group accuracy of detection.
In addition, in the present embodiment, on adjacent sub-carriers, dispose two same pilot frequency sequences and two same code group sequences respectively, still, also can dispose same pilot frequency sequence more than 3 and the same code group sequence more than 3.
In addition, the same with execution mode 7 in the present embodiment, because the length of the scrambler that multiply by on pilot tone is whole number of subcarriers half, therefore the length of distinguishing in the processing too the scrambler that will use at the scrambler of phase III is decided to be half.
In addition, in the respective embodiments described above, with situation about constituting by hardware be example the present invention will be described, still, the present invention also can be realized by software.
In addition, each functional block of using in explanation of the respective embodiments described above is LSI and realizing as integrated circuit typically.These can be separately by 1 chipization, also can comprise part or all like this and by 1 chipization.
Though be LSI,, be sometimes referred to as IC, system LSI, super (super) LSI, super large (ultra) LSI here, because of the integrated level difference.
In addition, the method for integrated circuit is not limited to LSI, also can realize with special circuit or common processes.After LSI makes, the connection of the circuit unit that can utilize the FPGA (Field ProgrammableGate Array) that can programme, can reconstruct LSI inside and the reconfigurable processor (reconfigurable processor) of setting.
And then, the other technologies of progress or derivation by semiconductor technology, the technology of the integrated circuit of displacement LSI occurs, and certainly uses its technology to carry out the integrated of functional block.Also there is possibility in the adaptation of biotechnology etc.
This specification is willing to that based on the spy of application on September 30th, 2004 spy of 2004-289149 and application on April 27th, 2005 is willing to 2005-130440.These contents all are comprised in here.
Industrial utilizability
The present invention is suitable for wireless mobile station arrangement and the radio communication base station dress that the moving body communication system is used Put etc.
Claims (17)
1. base station apparatus is characterized in that possessing:
Component parts is by pilot frequency code element and data symbols configuration frame;
Multiplying unit multiply by the code element that the code group sequence is used as being used to detect code group on specific pilot frequency code element that described frame comprised or specific data symbols; And
Transmit block sends to comprise and is used to detect frame code element and the described above-mentioned frame that is used to detect the code element of code group regularly.
2. base station apparatus as claimed in claim 1 is characterized in that,
Described transmit block sends described frame, and described frame is described frame code element regularly and the described code element that is used to detect code group are disposed at different positions on time shaft the frame that is used to detect.
3. base station apparatus as claimed in claim 1 is characterized in that,
Described transmit block sends described frame, and described frame is that the pilot frequency code element of same sequence is used to detect frame code element regularly as described, with the frame of frame boundaries disposed adjacent.
4. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit multiply by the code group sequence on the pilot frequency code element at the frame end of per two frames.
5. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit allows one of them of on time shaft adjacent data symbols multiply by the code group sequence.
6. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit allows in the pilot frequency code element of on time shaft adjacent same sequence the adjacent next pilot frequency code element of pilot frequency code element with the frame beginning, multiply by the code group sequence.
7. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit is divided into two the pilot frequency code element at frame end on frequency axis, allow the pilot frequency code element of the both sides after cutting apart multiply by same code group sequence.
8. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit allows at the frame end pilot frequency code element that alternately disposes on frequency axis multiply by the code group sequence.
9. base station apparatus as claimed in claim 1 is characterized in that,
Described multiplying unit is divided into a plurality of with the pilot frequency code element at frame end on frequency axis, allow the piece corresponding with the code group numbering multiply by the code group sequence in described a plurality of.
10. mobile station apparatus is characterized in that possessing:
First detection part detects frame regularly; And
Second detection part detects code group after detecting described frame timing.
11. mobile station apparatus as claimed in claim 10 is characterized in that,
Described first detection part carries out the related operation between adjacent code element, detects frame regularly according to the correlation that obtains by this related operation.
12. mobile station apparatus as claimed in claim 10 is characterized in that,
Described first detection part, code element for the both sides after being divided into two on the frequency axis, carry out the complex conjugate multiplication computing between adjacent code element, and a plurality of sequences that extracted by this complex conjugate multiplication computing are carried out related operation, detect frame regularly according to the correlation that obtains by this related operation again.
13. mobile station apparatus as claimed in claim 10 is characterized in that,
Described first detection part, carry out between the adjacent code element of same frequency and the complex conjugate multiplication computing between the adjacent code element of different frequency, and a plurality of sequences that extracted by this complex conjugate multiplication computing are carried out related operation, detect frame regularly according to the correlation that obtains by this related operation again.
14. mobile station apparatus as claimed in claim 10 is characterized in that,
Described second detection part carries out the related operation of described a plurality of sequence and code group sequence, obtains a plurality of correlations, and detects code group according to the summation of these a plurality of correlations.
15. mobile station apparatus as claimed in claim 10 is characterized in that,
Described second detection part is regularly determined the described position that is used to detect the code element of code group according to described frame.
16. mobile station apparatus as claimed in claim 10 is characterized in that,
Described second detection part for the pilot frequency code element that is split into a plurality of on frequency axis, carries out related operation at frame boundaries to each piece, and detects code group according to the correlation that is obtained by this related operation.
17. a small region search method is characterized in that having following steps:
Receiving step receives to comprise and is used to detect the frame that frame code element and being used to regularly detects the code element of code group;
First detects step, uses describedly to be used to detect frame code element regularly and to detect the frame timing; And
Second detects step, detect state frame regularly after, use the described code element that is used to detect code group to detect code group.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004289149 | 2004-09-30 | ||
| JP289149/2004 | 2004-09-30 | ||
| JP130440/2005 | 2005-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101032092A true CN101032092A (en) | 2007-09-05 |
Family
ID=38716330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800329287A Pending CN101032092A (en) | 2004-09-30 | 2005-09-29 | Base station device in multi-carrier transmission, mobile station device, and cell search method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101032092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420767B (en) * | 2007-10-25 | 2011-04-20 | 中兴通讯股份有限公司 | MBMS special carrier configuring method and data receiving method |
-
2005
- 2005-09-29 CN CNA2005800329287A patent/CN101032092A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420767B (en) * | 2007-10-25 | 2011-04-20 | 中兴通讯股份有限公司 | MBMS special carrier configuring method and data receiving method |
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