CN101568167A - Mobile station, synchronization detection method, sector identification method and mobile communication system - Google Patents

Mobile station, synchronization detection method, sector identification method and mobile communication system Download PDF

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Publication number
CN101568167A
CN101568167A CNA2009101466262A CN200910146626A CN101568167A CN 101568167 A CN101568167 A CN 101568167A CN A2009101466262 A CNA2009101466262 A CN A2009101466262A CN 200910146626 A CN200910146626 A CN 200910146626A CN 101568167 A CN101568167 A CN 101568167A
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sector
code
sch
symbol
sub
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设乐彰一
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]

Abstract

The invention discloses a mobile station, a synchronization detection method, a sector identification method and a mobile communication system. The The purpose is to reduce the process of a cell search including sector identification without increasing loads on a transmission/reception apparatus. A synchronization channel (SCH) included on downlink in a multicarrier mobile communication system is multiplied by a sector specific code and a cell specific code (step S1), assigned to subcarriers on the frequency axis (step S2), subjected to spreading processing and IFFT processing (steps S3, S4), and further subjected to insertion of GI and D/A conversion processing (steps S5, S6), and multicarrier is transmitted from a directional antenna of each sector (step S7). The receiving side specifies a SCH position by auto-correlation method or cross-correlation method, performs FFT, and then, concurrently performs identification of a sector by detection of the sector specific code, and acquisition of cell specific information by demodulation of the cell specific code.

Description

Travelling carriage, synchronization detecting method, sector identification method and mobile communication system
The application be that June 18, application number in 2007 are 200780022460.2 the applying date, denomination of invention divides an application for the application for a patent for invention of " data generating device and method, base station, travelling carriage, synchronization detecting method, sector identification method, information detecting method and mobile communication system ".
Technical field
The present invention relates to adopt the mobile communicating of E-UTRA (Evolved-UTRA) standard of multi-carrier communication mode, related in particular to data generating device, data creation method, base station, travelling carriage, synchronization detecting method, sector identification method, information detecting method and the mobile communication system of the data that generate the synchronizing channel (SCH:Synchronization Channel) that contains in down link (descending transmission) signal.
Background technology
In recent years, popularize in the world based on the 3rd third-generation mobile communication (3G) of W-CDMA mode.Now, further study the 4th third-generation mobile communication (4G) of the communication speed that in down link, realizes 100Mb/s～1Gb/s.But, enter into 4G fully and be not easy from 3G.Therefore, use the frequency band of 3G, import the 4G new technology simultaneously and to carry out the E-UTRA (Evolved-UTRA) of high-speed communication noticeable.In 3GPP (third generation partner program 3rdGeneration Partnership Project), carried out motion widely.
In the mobile communication system, travelling carriage is established or handover in order to carry out initial synchronisation, the sub-district and the sector that need the identification equipment of itself to connect.That is, need to detect the base station of communication object and the antenna of base station.In the 3rd third-generation mobile communication, in order to carry out Cell searching at a high speed, and so-called 3 stage small region search methods have been adopted." Cell searching " is the notion that comprises " sector search ".
3 stage Cell searchings in the 3rd third-generation mobile communication generally use synchronizing channel (SCH:Synchronization Channel) and Common Pilot Channel (CPICH:Common PilotChannel).At first, detect the reception timing (the 1st step) of SCH, then, implement the identification (the 2nd step) of frame timing and scramble code character by the coherent detection of SCH sign indicating number.And,, discern scrambling code (the 3rd step) by having used the coherent detection of CPICH.
In E-UTRA as the next generation mobile communication standard, as modulation system, used OFDM (Orthogonal Frequency Division Multiplexing: OFDM), but for Cell searching, technology (for example, refer to Patent Document 1, patent documentation 2, non-patent literature 1 and non-patent literature 2) according to above-mentioned 3 stage small region search methods has been proposed.
In the patent documentation 1, disclose in the 3 stage Cell searchings in having adopted the multi-carrier communication mode of OFDM, the 2nd synchronous code (S-SCH signal) frequency division multiplexing that the scramble code group identification is used is to the technology of a plurality of subcarriers.
In the patent documentation 2, disclose in the 3 stage Cell searchings in having adopted the multi-carrier communication mode of OFDM, gone up the technology of multiplexed cell identification with sign indicating number in Common Pilot Channel (CPICH).
In addition, in non-patent literature 1, proposed to have adopted the standardization of single sub-district repeated communications mode of OFDM.Further, propose to consider 1 sub-district to be divided into 3 sectors, the standard of the situation that a plurality of travelling carriages in base station that disposes in each sector and the sub-district communicate simultaneously.In this technology, go up the dual intrinsic extended code of intrinsic extended code in sub-district and sector that multiply by in Common Pilot Channel (CPICH).Therefore, travelling carriage can carry out the identification of sub-district (and sector) by carrying out duplicating based on each extended code the contrary expansion and the coherent detection of (replica).
In addition, in the non-patent literature 2, disclose in having adopted the multi-carrier communication mode of OFDM, by with the similar 3 stage Cell searchings of the 3rd generation technique, the technology of carrying out the identification of sub-district (and sector).Disclosed technology is same in this technology and the non-patent literature 1, and a sub-district is divided into 3 sectors, uses identical synchronizing channel sign indicating number (SCH sign indicating number) between each sector.And, for the transmission of SCH sign indicating number, between each sector, get temporal synchronously, and the SCH that carries out each sector simultaneously sends.And, the identification of sub-district and sector, promptly provide the selection of the sub-district and the sector of maximal received power, undertaken by the coherent detection of duplicating in the 3rd step based on the extended code of having used pilot channel.
Like this, even in E-UTRA, also proposed to adopt the technology of having used SCH and CPICH according to the 3 stage Cell searchings of 3G as follow-on communication standard.Especially, for sector identification, multiply by Common Pilot Channel as the extended code disclosed at non-patent literature 1 and non-patent literature 2, that the sector is intrinsic, and, detect the sector of received power maximum by carrying out coherent detection with contrary expansion and handle in the 3rd step.
Patent documentation 1: the spy opens the 2003-179522 communique
Patent documentation 2: the spy opens the 2005-198232 communique
Non-patent literature 1:3GPP " TR25.814, " Physical Layer Aspects for EvolvedUTRA (Release7) v.0.3.1 " 2005/10/18
Non-patent literature 2:3GPP " R1-060042, " SCH Structure and Cell SearchMethod in E-UTRA Downlink " 2006/1/25
As mentioned above, even in E-UTRA, also proposed to adopt the technology of having utilized SCH and CPICH according to the 3 stage Cell searchings of 3G as the next generation communication standard.Under this situation, sector identification is carried out coherent detection by the contrary expansion with having used CPICH (Common Pilot Channel) in the 3rd step and is handled and carry out.That is, in the prior art,, then can not carry out the identification of sector and sub-district as if processing without 3 stages.Therefore, in 3 stage Cell searchings, it is limited that required process is handled in the identification of shortening sub-district and sector.
In addition, in the 3rd step, carry out further needing the same processing of enforcement sector identification usefulness the coherent detection processing against expansion except what use with the cell identification of having used CPICH.That is, in the terminal stage in 3 stage Cell searchings, need carry out the detection of sub-district ID, need simultaneously to judge that the signal strength signal intensity of which sector in the same sub-district is strong by having used the contrary expansion of duplicating symbol.Therefore, the result need use the coherent detection of the reproducing signals of (the sub-district ID number that contains in the sub-district ID group) * (sector ID number).Therefore, the sector number that contains in the required time span of the coherent detection in the 3rd step and the sub-district is proportional.
In order to compare the correlation of each reproducing signals correspondence, need have the memory of storage based on the related operation result's of each reproducing signals capacity.That is, need the individual related operation result's of storage (the sub-district ID number * sector ID number that contains in the sub-district ID group) memory, caused the increase of memory span.
In addition, disclosed as above-mentioned non-patent literature 2, for each sector in the same sub-district, send identical SCH data simultaneously.Therefore, near the travelling carriage sector borders,, might produce the frequency band that received power reduces because of interfering with each other from the signal of a plurality of sectors or because of transmitting the decline that environment causes.Under this situation, the identification probability of sub-district and sector may reduce.
Summary of the invention
The present invention makes in view of these situations, the purpose of this invention is to provide the required time of cell search process that a kind of shortening comprises sector identification, reduces the capacity of the memory of storing the coherent detection result who has used pilot channel.And, the anti-interference of the cell search process that comprises sector identification or anti-fading characteristic are improved, and can not increase the burden of transceiver, simpler and realize comprising the Cell searching of sector identification more accurately.
(1) to achieve these goals, this means below the present invention has considered.Promptly, a kind of data generating device, the data of the synchronizing channel that generation sends by base station that the sub-district that comprises a plurality of sectors is administered, it is characterized in that, utilize and the corresponding sector of the sector identification serial number own code that is used to discern described sector, generate the data of the synchronizing channel of each sector.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(2) in addition, in the data generating device of the present invention, it is characterized in that described sector own code phase is orthogonality relation each other.
By this result, can carry out identification of high-precision sector or synchronous detecting.
(3) in addition, in the data generating device of the present invention, it is characterized in that described sector own code is public between neighbor cell.
By this structure, can carry out sector identification efficiently or synchronous detecting.
(4) in addition, data generating device of the present invention is characterized in that, utilizes and the corresponding orthogonal code of described sector identification serial number, generates the data of the pilot channel of each sector.
By this structure, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference or the anti-fading characteristic of the cell search process that comprises sector identification are improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
(5) in addition, data creation method of the present invention, the data of the synchronizing channel that generation sends by base station that the sub-district that comprises a plurality of sectors is administered, it is characterized in that, utilize and the corresponding sector of the sector identification serial number own code that is used to discern described sector, generate the data of the synchronizing channel of each sector.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(6) in addition, data creation method of the present invention is characterized in that, utilizes and the corresponding orthogonal code of described sector identification serial number, generates the data of the pilot channel of each sector.
By this structure, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference or the anti-fading characteristic of the cell search process that comprises sector identification are improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
(7) in addition, base station of the present invention administration comprises the sub-district of a plurality of sectors, it is characterized in that, comprising: storage part, memory by using with the data of the corresponding sector of sector identification serial number synchronizing channel own code, each sector that is used to discern described sector; And sending part, to the data of each sector transmission with the corresponding described synchronizing channel in described sector.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(8) in addition, base station of the present invention administration comprises the sub-district of a plurality of sectors, it is characterized in that, comprising: the sync channel data generating unit, utilize and the corresponding sector of the sector identification serial number own code that is used to discern described sector, generate the data of the synchronizing channel of each sector; And sending part, to the data of each sector transmission with the corresponding described synchronizing channel in described sector.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(9) in addition, in base station of the present invention, described sync channel data generating unit is utilized and the corresponding orthogonal code of described sector identification serial number, generates the data of the pilot channel of each sector, and described sending part is to the data of each sector transmission with the corresponding pilot channel in described sector.
By this structure, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference or the anti-fading characteristic of the cell search process that comprises sector identification are improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
(10) in addition, travelling carriage of the present invention communicates with the base station that the sub-district that comprises a plurality of sectors is administered, and it is characterized in that, from described base station received signal, this signal comprises the synchronizing channel of having utilized with the corresponding sector of the sector identification serial number own code that is used to discern described sector.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(11) in addition, in travelling carriage of the present invention, it is characterized in that, carry out sector identification according to described synchronizing channel.
By this structure, can carry out the identification of high-precision sector.
(12) in addition,, it is characterized in that, carry out synchronous detecting according to described synchronizing channel at travelling carriage of the present invention.
By this structure, can carry out the identification of high-precision sector.
(13) in addition, in the travelling carriage of the present invention, it is characterized in that described sector own code phase is orthogonality relation each other.
By this structure, can carry out identification of high-precision sector or synchronous detecting.
(14) in addition, in travelling carriage of the present invention, it is characterized in that described sector own code is public between neighbor cell.
By this structure, can carry out identification of high efficiency sector or synchronous detecting.
(15) in addition, travelling carriage of the present invention is characterized in that, it is relevant to utilize described signal and described sector own code to ask for, thereby carries out synchronous detecting.
By this structure, the timing (the 1st step) of SCH on cross-correlation method axle detection time of periodic correlation method that can be by having utilized SCH or the time waveform of duplicating symbol of having utilized the sector own code, with with based on the sector ID of the information on the frequency axis and the identification of sub-district ID (the 2nd step), finish Cell searching.Therefore, compare, can shorten search and handle with existing 3 stage Cell searchings.
(16) in addition, travelling carriage of the present invention is characterized in that, possesses the synchronous channel signal handling part, and described synchronous channel signal handling part is by asking for described signal and carrying out described synchronous detecting with the corresponding replica code of described sector own code relevant.
By this structure, can use the coherent detection of the replica code of sector own code.
(17) in addition, travelling carriage of the present invention is characterized in that, it is relevant to utilize described signal and described sector own code to ask for, thereby carries out sector identification.
By this structure, can carry out the identification of high-precision sector.
(18) in addition, in the travelling carriage of the present invention, it is characterized in that described synchronous channel signal handling part is by asking for described signal and carrying out the identification of described sector with the corresponding replica code of described sector own code relevant.
By this structure, can use the coherent detection of the replica code of sector own code.
(19) in addition, travelling carriage of the present invention is characterized in that, in advance storage a plurality of replica codes corresponding with described a plurality of sectors.
By this structure, can use the coherent detection of the replica code of sector own code.
(20) in addition, in the travelling carriage of the present invention, it is characterized in that described synchronous channel signal handling part is parallel asks for described a plurality of replica code relevant with described signal separately.
By this structure, can efficiently carry out coherent detection.
(21) in addition, in the travelling carriage of the present invention, it is characterized in that described synchronous channel signal handling part is by carrying out the specific described sector identification of carrying out to the described sector own code of correlation maximum.
By this structure, can carry out the identification of high-precision sector.
(22) in addition, in the travelling carriage of the present invention, it is characterized in that described synchronous channel signal handling part by described conversion of signals is asked for relevant with described sector own code to frequency domain, thereby carries out the identification of described sector.
By this structure, can carry out the identification of high-precision sector.
(23) in addition, travelling carriage of the present invention is characterized in that, also possesses sector own code storage part, its storage and corresponding a plurality of sectors, described a plurality of sectors own code.
By this structure, can be efficiently and carry out sector identification or synchronous detecting rapidly, become easy with the increase of the sector number number increase that makes the sector own code that is complementary simultaneously.
(24) in addition, in the travelling carriage of the present invention, it is characterized in that described synchronous channel signal handling part parallel is asked for described a plurality of sectors own code relevant with the signal of described conversion of signals behind the frequency domain separately.
By this structure, can efficiently carry out identification of high-precision sector or coherent detection.
(25) in addition, in the travelling carriage of the present invention, described synchronous channel signal handling part utilizes and the orthogonal code of carrying out the corresponding described pilot channel in sector after the sector is discerned by described synchronizing channel, detects the information that contains in the described pilot channel.
By this structure, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference or the anti-fading characteristic of the cell search process that comprises sector identification are improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
(26) in addition, synchronization detecting method of the present invention, when receiving from signal that the base station that the sub-district that comprises a plurality of sectors is administered sends, uses travelling carriage, this signal comprises the synchronizing channel that utilization generates with being used to discern the sector identification serial number corresponding sector own code of described sector, it is characterized in that, it is relevant to utilize described signal and described sector own code to ask for, thereby carries out synchronous detecting.
By this structure, the timing (the 1st step) of SCH on cross-correlation method axle detection time of periodic correlation method that can be by having utilized SCH or the time waveform of duplicating symbol of having utilized the sector own code, with based on the sector ID of the information on the frequency axis and the identification of sub-district ID (the 2nd step), finish Cell searching.Therefore, compare, can shorten search and handle with existing 3 stage Cell searchings.
(27) in addition, sector identification method of the present invention, when receiving from signal that the base station that the sub-district that comprises a plurality of sectors is administered sends, uses travelling carriage, this signal comprises the synchronizing channel that utilization generates with being used to discern the sector identification serial number corresponding sector own code of described sector, it is characterized in that, it is relevant to utilize described signal and described sector own code to ask for, thereby carries out sector identification.
By this structure, can carry out the identification of high-precision sector.
(28) in addition, sector identification method of the present invention is characterized in that, it is relevant to utilize described signal and described sector own code to ask for, thereby carries out synchronous detecting.
By this structure, the timing (the 1st step) of SCH on cross-correlation method axle detection time of periodic correlation method that can be by having utilized SCH or the time waveform of duplicating symbol of having utilized the sector own code, with based on the sector ID of the information on the frequency axis and the identification of sub-district ID (the 2nd step), finish Cell searching.Therefore, compare, can shorten search and handle with existing 3 stage Cell searchings.
(29) in addition, information detecting method information detecting method of the present invention, be to receive the information detecting method that the travelling carriage of the signal that sends from the base station that the sub-district that comprises a plurality of sectors is administered detects the information that pilot channel comprised, this signal comprises: utilize the synchronizing channel that generates with being used to discern the sector identification serial number corresponding sector own code of described sector, with utilization and the corresponding orthogonal code of described sector identification serial number and the described pilot channel that generates, it is characterized in that, utilize and the orthogonal code of carrying out the corresponding described pilot channel in sector after the sector is discerned by described synchronizing channel, detect the information that contains in the described pilot channel.
By this structure, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference or the anti-fading characteristic of the cell search process that comprises sector identification are improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
(30) in addition, travelling carriage of the present invention is characterized in that, comprising: acceptance division, from the base station received signal that the sub-district that comprises a plurality of sectors is administered; With the identification part, sector, discern the sector in signal transmission source according to the signal of described reception; This travelling carriage is based on the identification of the sector of being undertaken by identification part, described sector, the specific handover that carries out is carried out in the good sector of receiving feature, described acceptance division receives the data of having utilized with the corresponding sector of sector identification serial number synchronizing channel own code, each sector of discerning the sector.
By this structure, can carry out high speed and high-precision handover.
(31) in addition, mobile communication system of the present invention, it is characterized in that, constitute by base station and travelling carriage, the administration of described base station comprises the sub-district of a plurality of sectors, will utilize the data with the corresponding sector of sector identification serial number synchronizing channel own code, each sector that is used to discern described sector to send to each sector; Described travelling carriage receives described data from described base station.
By this structure,, can use synchronizing channel to carry out sector identification, and needn't use pilot channel by the sector own code be multiply by the sector common code.
(32) in addition, mobile communication system of the present invention is characterized in that, the communication mode between described base station and the travelling carriage is the multi-carrier communication mode.
By this structure, in down link, can carry out high speed, jumbo transmission.Can contribution be arranged to practicability based on the communication mode of E-UTRA.
(33) in addition, mobile communication system of the present invention is characterized in that, has used OFDM in the described multi-carrier communication mode.
By this structure, in down link, can carry out high speed, jumbo transmission.Can contribution be arranged to practicability based on the communication mode of E-UTRA.
(invention effect)
According to the present invention, by the sector own code be multiply by the sector common code, and needn't use pilot channel, only carry out the identification of sector by contrary expansion and the coherent detection of having used SCH.Therefore,, do not need to have used the contrary expansion and the coherent detection of pilot channel to handle, can reduce the capacity of the memory that uses in the related operation that has used pilot channel for sector identification.
In addition, because the sector own code be multiply by SCH itself, so in sector borders, also can get rid of the interference between the sector, the raising effect of the anti-fading characteristic that the randomization effect that also can obtain multiplying each other based on symbol causes.Give sector own code (orthogonal code) that each sector distributes increase coupling, and its number increase become easily with sector number, can elasticity corresponding to the sector result.
In addition,, then can only pass through SCH, come Direct Recognition sub-district ID if (multiply by the sub-district own code) sub-carrier number of SCH is abundant.Under this situation, the cell search process that the comprises sector identification only processing in 2 stages by having used SCH gets final product (2 stage Cell searching), compares with existing 3 stage Cell searchings, can shorten search time.
In addition, by the configuration on the structure of the sub-district own code that multiply by SCH and sector own code and content, the frequency axis is worked hard, the reduction that can not have the mode inhibition information of baneful influence to transmit precision each other with sector intrinsic information and cell unique information.In addition, independent each information of (promptly by parallel processing) demodulation.Thus, can shorten the processing time of the Cell searching that comprises the sector search.
Promptly, form the symbol that 2m is ordered by the symbol that makes up 2 m point quadratures, and the m point is used for sector identification, remaining m point is used for the identification of cell unique information, and, by cell unique information is transmitted as the phase information that the subcarrier of the sector own code key element that multiply by identical value (is preferably in disposed adjacent on the frequency axis) each other, and can efficiently transmit sector intrinsic information and cell unique information, and receiver side can high efficiency separation both and take out.
In addition, in small region search method of the present invention, the timing (the 1st step) of SCH on cross-correlation method axle detection time of periodic correlation method that can be by having utilized SCH or the time waveform of duplicating symbol of having utilized the sector own code, with based on the sector ID of the information on the frequency axis and the identification of sub-district ID (the 2nd step), finish Cell searching.Therefore, compare, can shorten search and handle with existing 3 stage Cell searchings.In addition, the coherent detection of having used pilot channel only data channel separate the timing needs, in Cell searching, do not need, so can realize alleviating the burden (minimizing of memory span etc.) of the hardware of using based on the related operation of pilot channel.The sector own code owing to superposeed on SCH is so for sector identification, also can obtain interference and the strong effect of decline ability between anti-sector.But, under the inadequate situation of sub-carrier number, only can not carry out the Direct Recognition of sub-district ID by SCH, the situation that has the detection that rests on sub-district ID group information, in this case as the processing of the 3rd step, use the contrary expansion and the coherent detection of pilot channel by enforcement, and can discern sub-district ID.
In addition, by multicarrier transceiver of the present invention, in down link, can carry out high speed and jumbo transmission.
Like this, according to the present invention, can shorten the required time of cell search process that comprises sector identification, simultaneously, reduced the capacity of storing the coherent detection result's who has used pilot channel memory, further, the anti-interference of the cell search process that comprises sector identification or anti-fading characteristic have been improved, and can not increase the burden of sending receiving system, can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
In addition, the present invention comprises various changes (concrete example, variation, application examples), and these change has contribution to the practicability based on the communication mode of E-UTRA (Evolved-UTRA).
For example, in the processing (processing of SCH timing detection) of the 1st step of Cell searching, except correlation method, also the cross-correlation method that is conceived to special time waveform can be adopted, under this situation, the such effect of structure of correlator can be obtained simplifying.In addition, by being " 1 " with the symbol as the subcarrier of phase reference on the frequency axis is all for example unified, when the contrary expansion of having used the sector own code, not needing must be with 6 subcarriers as one group of such restriction.In travelling carriage, when the various sectors own code that sends from the base station is known, can expand, and use cross-correlation to detect approaching sector detection based on the time waveform before the FFT based on contrary.When sector number increases, can adopt " the intrinsic symbol of set of sectors " as " sector own code ".
Description of drawings
Fig. 1 is the flow chart that expression multicarrier of the present invention sends an example of the main order of handling;
Fig. 2 is the flow chart that expression multicarrier of the present invention receives an example of the main order of handling;
Fig. 3 is the figure of expression as the notion on the basis of the generation of orthogonal code;
Fig. 4 is the arrangement of the explanation symbol element that constitutes 3 orthogonal codes (symbol 1, symbol 2, symbol 3) and the figure that uses of the principle under the situation of demodulation symbol 2 only;
Fig. 5 is that explanation is superimposed upon the figure that the method on the SCH is used with cell unique information (sector ID, notification channel bandwidth, antenna configurations, GI length etc.);
To be respectively explanation be superimposed upon the figure that the sign format that sent usefulness on the SCH is used with sector intrinsic information and cell unique information to Fig. 6 (a)～(d);
Fig. 7 is the figure of the sub-carrier indices (subcarrier sequence number) on the expression frequency axis;
Fig. 8 (a) is the figure of the distribution of the sector common code on the expression frequency axis; (b) be the figure of the formation of 3 sector own codes of expression; (c) be the figure of expression as the notion on the basis of the generation of sector own code;
Fig. 9 is illustrated on the frequency axis, the figure of the formation of the symbol sebolic addressing that the transmission cell unique information is used;
Figure 10 is the block diagram of the configuration example of physical layer in the base station (multicarrier transmitter apparatus) that is illustrated in mobile communication system and MAC (Media Access Control) sublayer;
Figure 11 is the concrete formation block diagram of expression transtation mission circuit portion shown in Figure 10;
Figure 12 is the block diagram of an example of the formation of expression multi-carrier receiver of the present invention;
Figure 13 is that expression has and regularly detects and the block diagram of the circuit configuration example of the function of frequency error detection;
Figure 14 is the figure of particular content of the contrary extension process of expression sector identification usefulness;
Figure 15 is the figure that the demodulation process of explanation cell unique information is used;
Figure 16 is the figure that is illustrated in the subcarrier that SCH distributed (that is the formation of the SCH on the frequency axis) that disposes on the frequency axis;
Figure 17 (a) is illustrated in the 3rd execution mode, multiply by the figure of the configuration on the frequency axis of sector common code of SCH, is in expression the 3rd execution mode (b), the figure of 3 sector own codes;
Figure 18 is the figure of the configuration of the sub-district own code in expression the 3rd execution mode;
Figure 19 is the figure that the frame in expression the 3rd execution mode constitutes;
Figure 20 is the figure that the particular content example that the related operation of sector own code handles has been used in expression;
Figure 21 is the figure of the demodulation method of the sub-district own code in expression the 3rd execution mode;
Figure 22 is the figure that the frame of the down link of the multi-carrier communications systems that uses among the present invention of expression constitutes;
Figure 23 is the figure of an example of the formation of expression sub-district and sector;
Figure 24 is the figure of an example of the allocation position of the synchronizing channel (SCH) of expression in the frame;
Figure 25 is the figure of the configuration example of expression SCH;
Figure 26 is the repetitive pattern that expression detects SCH, and carries out the formation block diagram of the receiver that time synchronized uses;
Figure 27 is the figure of an example of the synchronizing channel (SCH) of distributing on the subcarrier that is illustrated on the frequency axis;
Figure 28 is the figure of an example of the formation of the Resource Block in the ofdm communication mode studied among the 3GPP of expression;
Figure 29 (a) is the figure of the distribution of the sector common code on the expression frequency axis, (b) is the figure of the formation of 3 sector own codes of expression, is the figure of expression as the notion of the formation base of sector own code (c), represents the vector on the plural phase plane;
Figure 30 is the figure that expression transmits the formation on the frequency axis of the symbol sebolic addressing that cell unique information uses;
Figure 31 detects the time location of SCH by reproducing signals, and carries out the formation block diagram of the receiver that time synchronized uses;
Figure 32 is the figure that represents 76 subcarriers using in the 5th execution mode by each function;
Figure 33 is that expression be multiply by subcarrier (cell unique information detects and use the SCH subcarrier) and the figure of formation as the relation of the paired subcarrier of the subcarrier (cross-correlation test SCH subcarrier) of this phase reference after the cell unique information in the 5th execution mode;
Figure 34 (a) is in the 5th execution mode, the figure of the distribution of the sector common code on the expression frequency axis, (b) be in the 5th execution mode, the figure of the formation of 3 sector own codes of expression, (c) be in the 5th execution mode, expression is represented the vector on the plural phase plane as the figure of the notion on the basis of the generation of sector own code;
Figure 35 (a)～(d) is that explanation is in the 5th execution mode, a plurality of SCH subcarriers in during the synthetic SCH symbol and waveform in the time zone that forms during 1 symbol in, become the figure that the situation of the repetition of reference waveform (or the waveform behind this reference waveform that reverses) is used;
Figure 36 is the pie graph of symbol sebolic addressing on frequency axis that the transmission cell unique information in expression the 5th execution mode is used.
Wherein: 10-MAC portion; 12-SCH data generating unit; 14-sends data output section; 16-transtation mission circuit control part; 20 (20a～20b)-physical layer portion; 22 (22a～22c)-receiving circuit portion; 24 (24a～24c)-transtation mission circuit portion; 26 (26a～26c)-analog circuit portion; 28 (28a～28c)-antenna part; The contrary extension of 210-sector own code identification usefulness; 220-sector power judging part; 230-SCH data (comprising cell unique information) demodulation section; The 400-shift register; The 402-adder; The 404-multiplier; CL1～CL3-sub-district; SC1～SC3-sector.
Embodiment
The basic fundamental and the basic concept of the multi-carrier communication that uses among the present invention at first, are described.
(basic condition of multi-carrier communication)
In the following description, use OFDM as digital modulation mode.In ofdm communication system, consider that the situation that base station that 1 sub-district is controlled as for example 3 Control on Communication zones (sector) and a plurality of travelling carriages in the sub-district communicate simultaneously carries out standardization.In ofdm communication system, cut apart the wireless communication frame that the following describes (below be called " frame ") tinily, make its can in a plurality of travelling carriages, use (below, this is cut apart unit be called " Resource Block "), and with each resource block assignments to the good travelling carriage of communication environment, and realize the raising of communication speed.
In each sector by 1 base stations control, transmit frame under identical timing.That is, frame is sent synchronously.In addition, use same frequency band.Therefore, near cell boarder and sector borders, the signal that uses in neighbor cell or the adjacent sectors and the received signal of hope are disturbed, and cause the reduction of communication speed (throughput).In the mode of above-mentioned non-patent literature 1, estimate that as transfer path the pilot sub-carrier of the subcarrier of usefulness multiply by sector own code (being meant 3 symbol sebolic addressings that the sector is intrinsic in the example below) to what between the sector, distribute to same sub-carrier.And carry out system design, make it can be, remove the interference that the signal of adjacent sectors causes, and carry out transfer path estimation more accurately by the individual pilot sub-carrier of M (M is the integer 2 or more) of contrary expansion by the symbol sebolic addressing decision.
On the other hand, for the interference of neighbor cell, carry out multiply by pilot channel and data channel, and make the signal that in neighbor cell, uses cause that interference signal becomes design at random by the extended code that the sub-district is intrinsic.That is the dual intrinsic extended code of intrinsic orthogonal code in sector and sub-district that multiply by on pilot channel.
(explanation of frame)
Figure 22 is the frame assumption diagram of the down link of the multi-carrier communications systems that uses among the present invention of expression.The general frame structure of using in this frame structure and the ofdma communication mode is identical.That is, this frame structure is divided into certain hour interval (frame interval) a plurality of, and frequency domain also is divided into the certain bandwidth that is made of a plurality of subcarriers.1 zone after these are cut apart is called Resource Block in this manual.Generally, the unit behind the frame in zone sliced time is called subframe, the unit after frequency domain is cut apart is called subchannel.Among Figure 22, constitute to 6 subchannels of F6 by F1, constitute to 10 subframes of SF10 by SF1 along time-axis direction along the frequency axis direction.But piece is cut apart number and block size is not limited to this.Shared these pieces of each travelling carriage.Especially, in order to realize the raising of communication characteristic (throughput), with each block dispatching to the good travelling carriage of transfer path environment.In addition, carry out in existence under the situation of a plurality of travelling carriages of small data quantity communication, also can further cut apart 1 Resource Block and come in addition shared.
(Cell searching)
Each travelling carriage when beginning to communicate by letter, the good base station of selective reception characteristic from a plurality of base stations, and with after the base station is connected, beginning radio communication.So-called receiving feature is meant the received power height of received signal well.Action during the beginning of this radio communication generally is called Cell searching.Cell searching comprises the selection of the good base station of communication characteristic, the obtaining of cell unique information that comprises the information of base station IDs etc., frame synchronization and sign synchronization etc.In addition, sign synchronization is meant the situation that the FFT window is synchronous or window is synchronous.
Figure 23 is the figure of an example of the structure of expression sub-district and sector.As shown in the figure, (center of CL1～CL3) is provided with base station (BS1～BS3) a sub-district.And (CL1～CL3) is divided into 3 sectors (SC1～SC3) respectively with each sub-district.There are a plurality of travelling carriages (UE1 etc.) in each sub-district, the best base station of each mobile station in selecting quality of reception, and carry out radio communication.For example, (BS1～BS3) carry out the down direction radio communication with identical transmitted power, then the minimum BS1 of mobile station UE 1 and transmission loss is connected and communicates if base station shown in Figure 23.Like this, need to detect a plurality of base stations, and therefrom select the best base station of communication quality, will carry out Cell searching in order to connect.In aforesaid non-patent literature 1, because the sub-district own code be multiply by data channel, so when Cell searching, need obtain the information of sub-district own code.
(3 stage Cell searching)
As mentioned above, proposed to be called the small region search method that is divided into 3 steps of 3 stage Cell searching methods.In the 1st step, use the time correlation of SCH to detect, carry out sign synchronization, frequency deviation, 1/N frame timing detection.So-called this 1/N frame timing detection is meant the detection of carrying out under the situation of the multiplexed N SCH along time orientation.Details is described in the back.
Figure 24 is the figure of an example of the allocation position of the synchronizing channel (SCH) of expression in the frame.As shown in the figure, SCH is configured on the last symbol of the 5th subframe (SF5) and the 10th subframe (SF10).As previously mentioned, in the 1st step, come to carry out synchronously with 1/2 cycle in frame interval by the time location that detects 2 SCH in the frame.By using specific subcarrier described later to constitute SCH, thereby in the time shaft zone, form signature waveform.In the 1st step, use this waveform characteristic to get time synchronized.
In the 2nd step,, come demodulation to constitute the data of SCH, thereby obtain cell unique information (for example, sub-district ID or sub-district ID group, cell structure, antenna for base station number, announcement information notice bandwidth etc.) by the coherent detection of frequency domain.
In the 3rd step, by multiply by with the intrinsic extended code in the corresponding base station of sub-district ID after the reproducing signals of the pilot channel that pilot channel and travelling carriage generated between relevant, discern sub-district ID.
Figure 25 is the figure of the structure example of expression SCH.Among Figure 25, the longitudinal axis is represented frequency axis, transverse axis express time axle.Among the figure, one by one little quadrangle is the subcarrier that constitutes SCH, has constituted the channel of 1 symbol lengths.Like this, SCH is made of a plurality of subcarriers, and will establish from the subcarrier (DC subcarrier) of lower frequency side even number subcarrier and centre frequency and make empty (NULL) subcarrier, and the signal that the odd number subcarrier allocation SCH except that the centre frequency subcarrier is used.In addition, so-called gap carrier wave is meant that the power that does not have distributing signal is zero subcarrier.
Below, the subcarrier that has distributed the SCH of data is called " SCH subcarrier ".By such formation, the symbol that has distributed SCH is the waveform of the same signal that repeats to have 1/2 symbol lengths in time zone for 2 times.At the symbol of configuration this channel architecture more than on the precalculated position of frame, and in receiver, detect this repetitive pattern, thereby carry out time synchronized.
Figure 26 is the structured flowchart that repetitive pattern that expression detects SCH carries out the receiver that time synchronized uses.As shown in the figure, receiver has delay portion 91, complex conjugate operational part 92, multiplier 93, average portion 94 and the peak value test section 95 that received signal of making 90 postpones.Synchronous timing signal 96 is from 95 outputs of peak value test section.
In this receiver, with the signal that received with receive before this and the complex conjugate that postpones the signal behind 1/2 significant character multiplies each other.As a result, utilization high situation of correlation under the situation consistent with the SCH timing of aforementioned structure is carried out the detection of synchronization timing.As shown in figure 24, at SCH is under the situation of the locational system after frame N cut apart that is configured in the same time interval (N=2 among Figure 24), aignal averating after in 1/N frame interval, this being multiplied each other, and detect peak, thereby can in the 1/N frame, carry out synchronous and sign synchronization accurately.Wherein, the SCH in the frame counts N and position separately is known to travelling carriage.
Figure 27 is the figure of expression to the example of the SCH of the subcarrier allocation on the frequency axis.In Figure 27, represented to obtain the mode of the information of SCH by the phase difference P that calculates adjacent SCH subcarrier.Based on the information of the phase difference P between these SCH subcarriers, expression sub-district ID group, be in the frame a plurality of SCH which, also represent cell structure, antenna for base station number (the 2nd step).As above like this, generate and the corresponding frequency pilot sign reproducing signals of each sub-district ID that contains during detected sub-district ID organizes.And, can and detect sub-district ID by asking for relevantly with the frequency pilot sign that on subframe, disposes.
Figure 28 is the figure of an example of the structure of the Resource Block in the ofdm communication mode studied among the 3GPP of expression.Represented to comprise the representative Resource Block under the situation of SCH among Figure 28.Among the figure, except that SCH, pilot channel and data channel (comprising control information channel etc.) have also been disposed.Superior at frequency pilot sign so that the orthogonal code of disturbing intrinsic extended code in the sub-district of usefulness at random and the sector chien shih frequency pilot sign quadrature in same sub-district to use.Channel estimating in each sector is used the pilot channel that disposes on the first symbol of frame.But because near sector borders, on the position that can receive from the transmission signal of the different sectors of same sub-district, the transmission signal from adjacent sectors that is positioned at prosign moves as interference signal, so precision of channel estimation worsens.Thus, under this environment, multiply by frequency pilot sign, utilizing is the characteristic of the orthogonal code of orthogonality relation between the sector.That is, be suitable for following transfer path method of estimation, that is, and the complex conjugate of the orthogonal code of in the sector of multiply by on the subcarrier of pilot channel, using in hope, and pass through to implement contrary expansion, and eliminate interference signal from adjacent sectors.
In existing small region search method, when the detection of carrying out based on the sub-district ID of reproducing signals, need carry out the detection of sub-district ID, judge that simultaneously the signal strength signal intensity of which sector in the same sub-district is strong.Therefore, need carry out coherent detection with (sub-district ID number * sector ID number) individual reproducing signals of containing in the sub-district ID group.That is, in described the 1st step and the 2nd step, the SCH that can not use the sector in the same sub-district to send simultaneously judges the received power from the transmission signal of each sector.Therefore, the sector number that contains in the required treating capacity of the coherent detection in the 3 stage Cell searchings and the sub-district increases with being directly proportional.
In addition, under the situation of the storage part that the storage result corresponding with a plurality of reproducing signals is set for the pairing correlation of each reproducing signals is compared, need (sub-district ID number * sector ID number) the individual storage part that contains in the preparation sub-district ID group.Further, owing to send identical SCH data simultaneously from each sector of same sub-district, so near the travelling carriage sector borders, according to situation from the transfer path of the signal of a plurality of sectors, can occur sub-district ID identification probability being reduced because of the continuous very little subcarrier of decline amplitude in frequency domain.
Therefore, among the present invention, make synchronizing channel (SCH) have the recognition function of sector and sub-district.Thus, realized not relying on Cell searching, and overcome the problems referred to above based on the coherent detection of pilot channel.Below, embodiments of the present invention are described with reference to the accompanying drawings.
(the 1st execution mode)
Explanation small region search method of the present invention in the 1st execution mode.Fig. 1 is the flow chart that expression multicarrier of the present invention sends an example of the main order of handling.As shown in the figure, adopt the base station of the multi-carrier mobile communication system of ofdm communication mode to multiply by 3 kinds of sign indicating numbers and generated the synchronizing channel (SCH) that contains in the down link.That is, on " in the same sub-district public sector common code ", multiply by " sector own code (the different orthogonal code in each sector in the same sub-district) " and " sub-district own code (transmitting the different symbol in each sub-district that cell unique information is used) " (step S1).In addition, the sector common code also exists in the situation that a plurality of minizones are common code.
Then, by the distribution on the temporal frequency plane (mapping), SCH and pilot channel are distributed to the subcarrier (step S2) of Resource Block.And the multiplication and the IFFT that implement extended code handle (step S3, S4).Then, implement GI insertion, the D/A conversion process (step S5, S6) of (also being called Guard Interval: protect interval, CP:Cyclic Prefix Cyclic Prefix).At last, carry out frequency translation, from the directivity antennas transmission multicarrier (step S7) of each sector.
Fig. 2 is the flow chart that expression multicarrier of the present invention receives an example of the main order of handling.Travelling carriage receives the multi-carrier signal from the base station, and implements frequency inverted and A/D conversion (step S10).In addition, travelling carriage comprises mobile telephone, PDA terminal, portable personal computer.
Then, by being conceived to the periodically correlation method of the repetitive pattern of the SCH of configuration, detect the SCH position, and establish SCH sign synchronization (step S2).(stage a) corresponding to the 1st step of Cell searching for this step S2.Then, carry out the removal (step S12) of GI, serial/parallel conversion and FFT (high speed Fourier transform processing) (step S13).
Below, implement sector identification simultaneously and handle and cell identification process (the 2nd step (stage b)) of Cell searching.That is, by having used the contrary expansion of sector own code, detecting provides the sector of maximal received power own code, and identification best sector (antenna of the base station that will communicate by letter) (step S14).In addition, parallel with it, implement the demodulation (as required, further carrying out coherent detection) of sub-district own code, and obtain cell unique information (sub-district ID etc.) (step S15) with the sub-district own code.
Under the sufficient situation of sub-carrier number, by the Cell searching in these 2 stages, the identification of sub-district and sector is finished.But, under the situation of sub-carrier number deficiency, in step S15, can not Direct Recognition sub-district ID, and stop at the identification of sub-district ID group.Under this situation, implement identification (step S16) based on the sub-district ID of the coherent detection that has utilized pilot channel.Under this situation, it is the Cell searching (stage c) of the 3rd step.
The generation of sector own code (by the symbol of each sector quadrature) then, is described.Here, establish sector number and be " 3 ", the situation that generates 3 orthogonal symbols is described.
Fig. 3 is the figure of expression as the notion of the formation base of orthogonal code.As shown in the figure, plural phase plane is provided with 3 vectors.The plural number phase plane is the IQ plane, and the I axle is equivalent to real number axis, and the Q axle is equivalent to axis of imaginaries.On this plural number phase plane, be provided with amplitude for " 1 " and each other in 120 3 vector P1, P2, the P3 that spend angles.If these 3 vectors are carried out vector addition, then offset the axis of imaginaries composition of vector P2, P3.And, because result (=-1) and the vector P1 (=+ 1) behind the real number axis composition of addition vector P2, P3 offsets each other, so the result of vector addition is " 0 ".3 vectors that use is in this relation generate 3 orthogonal codes.
Fig. 4 is the arrangement of the explanation symbol element that constitutes 3 orthogonal codes (symbol 1, symbol 2, symbol 3) and the figure that uses of the principle under the situation of demodulation symbol 2 only.Among the figure, transverse axis is a time shaft, and the longitudinal axis is a frequency axis.As shown in Figure 4, establish (symbol 1)=(P1, P1, P1), (symbol 2)=(P1, P2, P3), (symbol 3)=(P1, P3, P2).One of them of 3 vectors of each symbol use Fig. 3 constitutes as symbol element.Symbol 2 is identical with employed symbol element in the symbol 3, but the arrangement difference on frequency axis.
Here, for example, suppose the only situation of demodulation symbol 2.Under this situation, respectively symbol element P1, P2, the P3 of symbol 2 be multiply by separately complex conjugate.Thus, phase place rotation and become and do not have the axis of imaginaries composition.And, if each multiplication result of addition, then owing to 3 real number axis compositions of addition (=1), so the coherent detection result becomes " 3 ".Same complex conjugate be multiply by symbol 1 and symbol 2 and addition equally.As a result, for any one symbol, the rotation of the phase place of each symbol element, but the vector of P1, P2, P3 keeps as a result, and can not eliminate.Therefore, if these vectors of addition, then addition result becomes " 0 " (with reference to figure 3).Like this, can only take out symbol 2.Under the situation of only taking out symbol 1 or only take out under the situation of symbol 3 also identical.Like this, symbol 1～symbol 3 of Fig. 4 comes quadrature with 3 symbol elements (3 points (tip)) as one group.
In addition, among the present invention, sector number is not limited to " 3 ".Also having sector number is situation more than 4.Under this situation, utilize said method, just can easily generate the orthogonal code corresponding with sector number.That is, increase the number of the orthogonal vector among Fig. 3, and use the method for Fig. 4 that these vectors are configured on the frequency axis.Thus, can generate more symbol.That is,, then can generate orthogonal code as much as possible if the number of a group code key element that disposes on the frequency axis increases.Therefore, also can be corresponding flexibly under the situation that sector number increases.
Then, the cell unique information that how to superpose is described on SCH.Contain sub-district ID, notification channel bandwidth, antenna configurations and GI length etc. in this cell unique information.
Fig. 5 is the figure that the method for explanation stack cell unique information on SCH is used.Among Fig. 5, transverse axis is a time shaft, and the longitudinal axis is a frequency axis.Among Fig. 5, to subcarrier allocation symbol A as phase reference.And,, dispose and distributed symbol (C1, C2, the C3 of expression with the phase difference of this subcarrier adjacent to subcarrier as this phase reference ...) subcarrier.Symbol (C1, C2, C3 by the symbol as phase reference " A " and this phase difference of expression ...), form and transmit the sub-district own code that cell unique information is used.That is, cell unique information is not the absolute phase of subcarrier, and transmits as the information of the relative phase difference of representing a pair of subcarrier.Among Fig. 5, with dashed lines surrounds K1, K2, the K3 that represents ... represent a pair of subcarrier.
Then, the feature of using SCH to transmit the sign format that sector intrinsic information and cell unique information use simultaneously is described.As shown in Figure 4, if distinguish 3 sectors respectively, then exist the symbol of 3 orthogonal dot cycles to get final product.But,, then can not carry out correspondence by the symbol of simple structure shown in Figure 4 if also will transmit cell unique information simultaneously.Especially under the situation of having used the relative phase difference information between this sub-carrier shown in Figure 5, it is very difficult that the symbol by structure shown in Figure 4 transmits cell unique information.
That is, sector intrinsic information and cell unique information all transmit by the phase modulated of subcarrier, but an information can not have baneful influence to another information.Meanwhile, at receiver side, in order to make the Cell searching high speed, carry out demodulation in the time of must be to two information of same.Therefore, as shown in Figure 4, use the group of 3 points (3 symbol element) of 2 groups of quadratures.These are made up on frequency axis be configured, thereby this 6 point (6 symbol element) is formed symbol as one group (that is, with these 6 as component unit).
To be respectively explanation be superimposed upon the figure that the sign format that sends usefulness on the SCH is used with sector intrinsic information and cell unique information to Fig. 6 (a)～(d).Among Fig. 6 (a), use the group of 3 points (3 symbol element) of the quadrature shown in 2 picture groups 4, and these are made up on frequency axis be configured.And expression is with the example of this 6 point (6 symbol element) as the configuration of the each point under one group of situation that forms symbol.Here, with these 6 o'clock as a component unit.
Fig. 6 (a) expression replaces mixed configuration 3 points, and (P3) (=P1, P2 P3), make that the symbol element of identical value is adjacent on frequency axis each other with other 3 points for=P1, P2.Thus, generate 6 symbol shown in Fig. 6 (b) (=P1, P1, P2, P2, P3, P3).In this symbol of 63 use as the sector own code, and remaining 3 as multiply by cell unique information.
That is, shown in Fig. 6 (c), (=P1, P2 P3) are used for coherent detection (sector identification) based on method shown in Figure 4 to odd number 3 points.On the other hand, (=P1, P2 P3) multiply by symbol as the expression relative phase difference information of cell unique information (C1～C3) to even number 3 points.As shown in Figure 5, so-called " relative phase difference information " is meant " having multiply by the phase information between the subcarrier of sub-district own code of same value ".Among Fig. 6 (c), (=P1, P2, subcarrier P3) are the subcarriers as phase reference to have disposed odd number 3 points respectively.
For example, will (P1, P1) such distribution 2 subcarriers of sector own code of identical value as a pair of, and the P1 of high-frequency side be multiply by the C1 of expression phase difference, and with this C1 as transmitting the symbol that cell unique information is used.Equally, will (P2, P2) such distribution 2 subcarriers of sector own code of identical value as a pair of, and the P2 of high-frequency side be multiply by the C2 of expression phase difference, and with this C2 as transmitting the symbol that cell unique information is used.In addition, among Fig. 6 (c), the circle of with dashed lines surrounds symbol C1, C2, the C3 of expression phase information.Cn=(C0, C1, C2 ...) be the sub-district own code.
In the above description, for convenient, after " sector own code " distributed to subcarrier, further distribute the order of " sub-district own code " to describe.But, the situation that the distribution (multiplication) that in fact, exists the distribution (multiplication) of " sub-district own code " to have precedence over " sector own code " is carried out.No matter which multiplication formerly, its result is identical.That is, the result multiply by sector common code (S0), sub-district own code and sector own code three on SCH.Therefore, which of the multiplication of the multiplication of sub-district own code, sector own code is in the preceding problem that do not become in essence.In addition, above-mentioned " sector common code (S0) " is public symbol in a plurality of sectors in the same sub-district, in this specification, has the situation that only is called " sector common code ".
Under situation, because disposed adjacent has been distributed each subcarrier of the sector own code of identical value on frequency axis, so both sides' subcarrier improves through the probability that equivalent transfer path arrives receiver side as this symbolic construction of Fig. 6 (c).Therefore, the advantage that can ignore the phase place rotation that the tansfer function difference by transfer path causes is arranged.Therefore, receiver side only high Precision Detection go out the phase difference of the adjacent sub-carrier that causes by the sub-district own code.Thus, can carry out the demodulation of cell unique information.
But the structure of sector own code is not limited to the structure as Fig. 6 (b).For example, shown in Fig. 6 (d), can be on frequency axis, to divide 2 sections overlapping sectors 3 points (P1, P2, P3) configurations each other merely.Transmission for cell unique information, for example, will (P1, P1) such distribution 2 subcarriers of sector own code of identical value as a pair of, P1 to the high-frequency side multiply by the C1 that represents phase difference, and this C1 is identical with the situation of Fig. 6 (c) as the aspect of cell unique information.
Like this, among the present invention, synchronizing channel (SCH) be multiply by sector own code by each sector quadrature.That is, make about sector and non-orthogonal SCH orthogonalization.And, can carry out sector identification by the received power measurement of having used SCH, and also can carry out the identification of high-quality sector according to good frequency characteristic in sector borders.Further, the sub-district own code also multiply by SCH and sends simultaneously, thereby can carry out the identification of sub-district ID.
Therefore, the existing 3 stage small region search methods of replaced dual-purpose SCH and CPICH, and can realize 2 new stage small region search methods.Thus, can shorten the processing procedure of the Cell searching that comprises sector identification.In addition, for the identification that takes into account the sector and the identification of sub-district, need work hard multiply by on the symbolic construction of SCH, but among the present invention, will be that the orthogonal code of unit is used in pairs with the multiple spot.That is,, and transmit cell unique information according to this relative phase difference to one in the symbol with identical value symbol that further multiply by the expression relative phase difference.Thus, it is simple and brief that symbol becomes, and can carry out the transmission of the identification of sector and sub-district with information simultaneously.
As a result, in the multicarrier transceiver, can not produce special burden.In multicarrier receiver, can implement the identification of sector ID and the demodulation of cell unique information simultaneously, can implement effective Cell searching.
(the 2nd execution mode)
In the present embodiment, be example, the data structure of SCH be described and comprise the small region search method that the sector is discerned with the situation that SCH is configured in the subframe rear end.
So-called cellular system is meant the mobile communication system that is made of a plurality of sub-districts, uses identical frequency band but the cellular system that uses in the present embodiment is each sub-district, and the ofdma communication mode is used for the single sub-district repeated communications system of communication mode.This communication system is 3 communication zones (sector) with cell division as shown in figure 23, and by 1 base station that the central part in the sub-district is provided with, carries out radio communication with the travelling carriage that is positioned at a plurality of sectors.Though the identical frequency band of use in each sector, the orthogonal code that the sector is intrinsic multiply by pilot channel, and by the contrary expansion of use, and can near sector borders, carry out transfer path estimation accurately.
The communication mode of down direction is an ofdm communication mode same as described above.The structure of communication frame and Resource Block respectively with Figure 22 and shown in Figure 28 be same form.In addition, adopt the structure of the backend arrangement SCH of the time durations after frame being carried out Ss five equilibrium (Ss is the approximate number of number of sub frames Sf (natural number)).Thus, on time shaft, periodically dispose SCH.In execution mode shown in Figure 24, Sf is 10, Ss is 2.
For pilot channel, in the present embodiment, use the such mode of mode (CDM:Code Division Multiplex) multiplexed on the same sub-carrier in same-sign between the sector.But going for same-sign is the mode of orthogonality relation in such mode of mode multiplexed on the different subcarriers (FDM:Frequency Division Multiplex) or the pilot channel that is multiplexed to different symbols between the such sectors such as mode of the mode (TDM:Time Division Multiplex) of identical subcarrier each other.
In the present embodiment,, carry out CDM as the SCH that sends from each sector and send the signal that multiply by behind the pairing symbol sebolic addressing of the orthogonal code that multiplies each other on the pilot channel.Thus, travelling carriage can also be realized good frequency characteristic in sector borders by the expansion effect of symbol when the received power of judging from signal of base station.Meanwhile, can judge the received power of each sector.In addition, also can be identical with the orthogonal code corresponding symbol sequence that multiply by this pilot channel with the symbol sebolic addressing that multiply by pilot channel.
At first, in the mobile communication of present embodiment, the transmission signal that sends from the base station is carried out the physical channel (below be called " SCH ") of the synchronous usefulness of time and frequency, its concrete structure is described about travelling carriage.
Fig. 7 is the figure that is illustrated in the sub-carrier indices (subcarrier sequence number) on the frequency axis.As shown in the figure, the sequence number of the subcarrier of low frequency side (bottom) is 1, and the sequence number of the subcarrier on the centre frequency is " n+1 ".In the following description, suitably use this sub-carrier indices.
Fig. 8 (a)～(c) is respectively the figure that the data structure of the SCH that sends simultaneously of 3 sectors of explanation in the same sub-district is used.Fig. 8 (a) is the figure of the distribution of the sector common code on the expression frequency axis, and Fig. 8 (b) is the figure of the structure of 3 sector own codes of expression.And Fig. 8 (c) is the figure of expression as the notion of the formation base of sector own code, is illustrated in the vector on the plural phase plane.
The signal frame that sends from the base station is made of a plurality of symbols.The SCH data that Fig. 8 is conceived to these a plurality of symbols illustrate.Among Fig. 8, the longitudinal axis is represented frequency axis, transverse axis express time axle.Each subcarrier is identical with situation shown in Figure 4, will from low frequency side even number subcarrier ( sub-carrier indices 2,4,6 ..., 2n) and the centre frequency subcarrier as the gap carrier wave.And, will except that the odd number subcarrier the centre frequency subcarrier ( sub-carrier indices 1,3,5 ..., 2n+1) subcarrier used as data allocations uses.
Signal indication sector common code shown in Fig. 8 (a).To each SCH subcarrier allocation S 0S 0It is arbitrary value with A*exp (j ω) expression.Here, A represents that amplitude, j represent that imaginary unit, ω represent phase place.But, in this specification, amplitude A is illustrated as 1.Because sector common code S 0In all sectors in each sub-district is public, so can be used at random for the signal that makes the minizone.
Then, the sector own code is described.Fig. 8 (b) is illustrated in the situation of using the sector own code in 3 sectors.Symbol is an intrinsic symbol in each sector in same sub-district, and symbol 1～3 is corresponding with 3 sectors as present embodiment.Travelling carriage and base station are known the correspondence of the sector ID in these symbols and the same sub-district in advance.As the sector own code, multiply by in the symbol sebolic addressing of SCH subcarrier, from low frequency side odd number SCH subcarrier ( sub-carrier indices 1,5,9 ...) to even number SCH subcarrier ( sub-carrier indices 3,7,11 ...) phase difference in each sector be 0 the degree, 0 the degree, 0 the degree.Phase difference from even number SCH subcarrier to odd number SCH subcarrier is 0 degree, 120 degree, 240 degree each sector.
Each symbol is that amplitude is 1 symbol.Because these symbol sebolic addressings are 6 repetitions (6 is 1 cycle), so several n of SCH subcarrier are 6 integral multiples.If see 1 repeating part (6 point) of these 3 symbol sebolic addressings, then multiply by each symbol sebolic addressing as if complex conjugate with the optional sign sequence, and be separated by 1 and come average addition 3 points, then under the situation that multiply by the symbol sebolic addressing outside the selected optional sign sequence itself and be 0.In addition, multiply by under the situation of symbol sebolic addressing arbitrarily it and be 3.
For example, the situation of (exp (j0 π), exp (j0 π), exp (j4 π/3), exp (j4 π/3), exp (j2 π/3), the exp (j2 π/3)) of (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), the exp (j4 π/3)) of (exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), the exp (j0 π)) of consideration symbol 1, symbol 2 and symbol 3.If select symbol 2 as optional sign, the complex conjugate of then symbol 2 is (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), exp (j4 π/3)). the symbol that symbol 1 multiply by respectively to symbol 3 after the complex conjugate of symbol 2 is respectively (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), exp (j4 π/3)), (exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π)), (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j2 π/3), exp (j2 π/3)). Further, if the odd number and the even number of each point of vector addition then is respectively (0,0), (3,3), (0,0), become the symbol that has outside the symbol of selecting as optional sign 2 and be the symbol sebolic addressing of 0 such feature.This means, send simultaneously under the situation of SCH of the identical data after multiply by the orthogonal code corresponding (Fig. 8 (b)) in each sector in same sub-district with each sector, travelling carriage by having received SCH by whenever predetermined 3 come contrary expansion SCH, thereby separable from any sector signal and from the interference signal of adjacent sectors.
Then, the symbol sebolic addressing that the transmission cell unique information is used is described.Fig. 9 is illustrated on the frequency axis, the structure chart of the symbol sebolic addressing that the transmission cell unique information is used.Symbol sebolic addressing shown in Figure 9 is owing to being to transmit the symbol sebolic addressing that cell unique information is used, so use different symbol sebolic addressings in each minizone.But, use identical symbol sebolic addressing between the sector in same sub-district.So-called cell unique information is meant sub-district ID or information and the antenna number of base station and the information of system bandwidth etc. of the intrinsic extended code used in the sub-district.Required information when cell unique information comprises travelling carriage and is connected at first with the base station.
But extended code information is very many symbolic numbers because of the symbol lengths that constitutes this information, so in symbol shown in Figure 9, have the inadequate situation of amount of information of notice usefulness.In this case, the several sub-districts (extended code) of can dividing into groups generate symbol sebolic addressing by identical information in belonging to the sub-district of this group.Under this situation, owing to can not discern the intrinsic extended code in sub-district fully, so discern the intrinsic extended code in final sub-district by the pilot channel that multiply by after the extended code by information from SCH.
The symbol sebolic addressing of Fig. 9 is one group of formation from the low frequency side with 6.6 o'clock at the identical symbol of the last distribution of odd number SCH subcarrier ( sub-carrier indices 1,5,9).In addition, the symbol after multiply by the sub-district own code on the symbol that is distributed in the odd number distribution on the even number SCH subcarrier ( sub-carrier indices 3,7,11).Symbol to the odd number subcarrier allocation is identical in 6 o'clock, but does not need identical with the symbol of use in other 6.The each point amplitude separately that forms symbol sebolic addressing is 1.In addition, symbol lengths is under the situation of n at the SCH sub-carrier number, needs the symbol sebolic addressing of n/2 symbol lengths for forming described even number SCH subcarrier.Because symbol lengths depends on the SCH sub-carrier number, so under the fully long situation of SCH sub-carrier number, generally can quantity how to generate the better symbol sebolic addressing of correlation properties.Therefore, as previously mentioned, can can't help to represent the symbol sebolic addressing of sub-district ID group, and constitute by the symbol sebolic addressing of the information that comprises direct representation sub-district ID.
More than shown in 3 kinds of symbol sebolic addressings are the symbol sebolic addressings that constitute SCH, multiply by these symbol sebolic addressings, and send SCH from the transmitter of each sector.The structure of base station then, is described.
Figure 10 is the physical layer in the base station (multicarrier transmitter apparatus) of expression mobile communication system and the block diagram of the structure example of MAC (Media Access Control) sublayer.As shown in the figure, the base station comprises that mapping, the scheduling of carrying out logic channel and physical channel are handled and the control of physical layer portion, and will output to physical layer portion from the data of higher level's layer input, on the other hand, will output to from the data of physical layer portion input the MAC portion 10 of higher level's layer, according to carrying out from the control information of MAC portion from the transmission data of this MAC portion 10 inputs to the conversion of wireless transmission signal and the wireless receiving signal that will receive by antenna part the 20a～20c of physical layer portion to the conversion of transmission data.
MAC portion 10 comprise according to the transtation mission circuit control part 16 of controlling transtation mission circuit portion from the assignment information of each Resource Block of the frame of higher level's layer notice, with the be complementary SCH data generating unit 12 of the cell unique information that transmission data output section 14, generation or memory allocation that data with the physical channel of the data channel of each Resource Block, pilot channel etc. are input to transtation mission circuit portion use to SCH of the timing of being dispatched.
In the present embodiment, SCH be travelling carriage in time with the frame and the sign synchronization that send from the base station, and obtain the channel that cell unique information is used.Therefore, under the immutable situation of SCH data, must generate data from MAC portion 10 in the time of must not sending at every turn, and (stored on the 20a～20c) in each physical layer portion corresponding with the inside of MAC portion 10 or sector, and send with SCH and regularly to be complementary and to distribute to this symbol, thereby can regularly be sent.In the present embodiment, carry out the generation of SCH data, but also can make (the 20a～20c) have this function to be implemented of physical layer portion of each sector by the SCH data generating unit 12 in the MAC portion 10.
The SCH data are with the data of other data channels, are input to (the 20a～20c) of physical layer portion from MAC portion 10.The data of SCH data and data channel are with the distribution control information from each Resource Block of transtation mission circuit control part 16 notice of MAC portion 10, are input to (the 20a～20c), and according to the assignment information of Resource Block, give each resource with data allocations of physical layer portion.
Physical layer portion (20a～20c) comprises data channel, pilot channel and SCH from 10 inputs of MAC portion modulated and the multiplying each other of sector own code, and after being multiplexed on the Resource Block, be input to analog circuit portion (the transtation mission circuit portion of 26a～26c) (24a～24c); Demodulation is from (the output of 26a～26c) the and be input to (22a～22c) of receiving circuit portion of MAC portion 10 of analog circuit portion; Will (the transmission conversion of signals of the input of 24a～24c) be a wireless frequency, and will (received signal of 28a～28c) receive is converted to the ((26a～26c) of the analog circuit portion of the frequency band of 22a～22c) can handle of receiving circuit portion from antenna part from transtation mission circuit portion; Will (the transmission signal of the input of 26a～26c) sends to wireless space, and the antenna part 28 that receives the signal in the wireless space (comprises the directivity antennas 28a corresponding with each sector～28c) from analog circuit portion.
Then, transtation mission circuit portion (the concrete internal structure of 24a～24c) is described.Figure 11 is the concrete structure block diagram of expression transtation mission circuit portion shown in Figure 10.(the Reference numeral 24a of Figure 10～24c) carry out of transtation mission circuit portion 24 from the data channel of MAC portion 10 inputs and the coding and the modulation of pilot channel, and after having modulated aforesaid SCH data, multiply by the sector own code, in data channel, pilot channel and dispenser, according to from the control signal of MAC portion, be multiplexed on the Resource Block and send.
" SCH data " among Figure 11 are meant sub-district own code (with reference to figure 9) be multiply by symbol data after the sector common code (with reference to figure 8 (a)).And, in the physical layer portion of each sector, send the data after sector own code (with reference to figure 8 (b)) multiply by these symbol datas.
(the 24a～24c) comprising: the signal processing part 50 (50a～50c) and carrying out equally that the data channel from MAC portion 10 input is sent the signal processing of data by each Resource Block of transtation mission circuit portion 24 shown in Figure 11 from the modulation of the SCH data of MAC portion 10 inputs and the SCH data processing division 60 that multiplies each other of sector own code.In addition, comprising: the pilot channel data handling part 70 that multiplies each other that carries out equally the orthogonal code intrinsic from the modulation of the pilot channel data of MAC portion 10 inputs and sector; With will from signal handling part 50 (output signal of 50a～50c), from the output signal of SCH data processing division 60 and the dispenser 81 of distributing to each subcarrier of Resource Block from the output signal of pilot channel data handling part 70.
In addition, comprising: use the extended code that generates by extended code generating unit 83 to carry out the extended code multiplier 82 that forms of extended code; To be converted to IFFT (the lnverse Fast Fourier Transform) portion 84 of time waveform through the data-signal string of the frequency domain after the extension process; And the P/S converter section 85 of the output of string conversion IFFT portion 84; The output of P/S converter section 85 is inserted the GI insertion section 86 of GI; With the D/A converter section 87 that the output signal of GI insertion section 86 is converted to analog signal from digital signal.Dispenser 81 and extended code multiplier 82 are all according to handling from the control information of MAC portion 10.Dispenser 81 is distributed to each physical channel the subcarrier of hope.Extended code multiplier 82 multiply by physical channel except that SCH with extended code.
Signal processing part 50 (50a～50c) comprising: the error correction coding portion 51 that sends the error correction coding of data; And the S/P converter section 52 of string conversion error correction coding portion output; With the modulation portion 53 of the output of S/P converter section being carried out the modulation treatment of BPSK, QPSK, 16QAM etc.
In addition, SCH data processing division 60 comprises: to carry out the SCH modulation portion 61 of modulation treatment from the SCH data of MAC portion 10 inputs; The sector own code be multiply by the multiplier 62 of the output of SCH modulation portion; Generate the sector own code generating unit 63 of (or storage) sector own code.
In addition, pilot channel handling part 70 comprises: the pilot data modulation portion 71 of the pilot data from 10 inputs of MAC portion being carried out modulation treatment; The sector own code be multiply by the multiplier 72 of the output of pilot data modulation portion 71; Generate the code element generating unit 73 of (or storage) sector own code.
Signal processing part 50 (distributing to the dispenser 81 of suitable subcarrier according to the control information from transtation mission circuit control part (Reference numeral 16 of Figure 10) notice of MAC portion 10 by the output of 50a～50c), after distributing to suitable subcarrier, output to IFFT portion 84.
But, under the situation that the symbol 1 shown in Fig. 8 (b) uses as the sector own code, because all symbols are 1, so can contraction in multiplication portion (62,72) and code element generating unit (63,73).In addition, as previously mentioned, be under the situation of fixed value in the SCH data, do not export the SCH data from MAC portion 10 when not needing SCH transmission at every turn.Therefore, also can replace SCH data processing division 60, the SCH data store is set wait and store the SCH data.Thus, can when sending SCH, read the SCH data at every turn, and be undertaken multiplexed by dispenser 81 and data channel and pilot channel from this SCH storage part.
(the Reference numeral 26a of Figure 10～26c) is from antenna part 28 (the directivity antennas 28a of Figure 10～28c) send as wireless signal air through carrying out analog circuit portion to the frequency translation of wireless frequency in the output of D/A converter section 87.
As mentioned above, in the transmitter of the base station of controlling a plurality of sectors, for the SCH data, the sector own code be multiply by identical SCH data, and send simultaneously from the antenna of each sector correspondence.The SCH reception that can have thus, high-quality frequency characteristic.Meanwhile, can when receiving, SCH select best sub-district, the also selection of the sector that can receive.
The structure of multi-carrier receiver then, is described.Figure 12 is the structured flowchart of expression multi-carrier receiver of the present invention.This multi-carrier receiver is equivalent to mobile telephone, PDA terminal, portable personal computer etc.As shown in the figure, multi-carrier receiver comprises antenna part 100, simulation receiving circuit portion 101, A/D converter section 102, timing test section 103, GI removal portion 104, S/P (serial) converter section 105, FFT portion 106, extended code multiplier 107, subcarrier compensation section 108, demodulation section 109, error correction decoding portion 110, extended code generating unit 111 and SCH signal processing part 200.SCH signal processing part 200 comprises the contrary extension 210 of sector identification usefulness, the SCH data demodulates portion 230 that district's intrinsic information is turned in power judging part 220 reconciliation in sector down.
This multi-carrier receiver (following only be called sometimes " receiver ") implements to comprise the Cell searching of sector identification basically based on flow chart shown in Figure 2.At first, receiver detects SCH regularly in order to proofread and correct time synchronized and the frequency departure with the signal that sends from the base station according to received signal.That is, receive the wireless signal that sends from the base station, and the wireless signal that is received is converted to the base band frequency band by simulation receiving circuit portion 101 from radio band by antenna part 100.And the analog signal conversion that A/D (analog/digital) converter section 102 will be converted to the base band frequency band is a digital signal.
Then, regularly test section 103 carries out the detection of SCH and handles in order to carry out sign synchronization from the reception data that are converted to numerical data by A/D converter section 102.Here, the regularly circuit structure of test section 103 is described.
Figure 13 is the regularly block diagram of the structure example of test section 103 of expression.Regularly test section 103 has the function of regularly detection and frequency error detection.As shown in figure 13, this timing test section 103 comprises delay portion 301, complex conjugate operational part 302, multiplier 303, average portion 304, peak value test section 305 and as the arctangent cp cp operation circuit 307 of frequency error detection portion.
From this structure as can be seen, the complex conjugate that timing test section 103 becomes by the signal behind signal delay 1/2 significant character that will be received multiplies each other with the reception data, thereby detects the circuit of peak value when the same waveform as of 1/2 significant character repeats.That is, used from aforesaid low frequency side odd number subcarrier ( sub-carrier indices 1,3,5 ..., 2n+1) the situation of timing of SCH data under, detect peak value.Detect a plurality of peak values by the signal from a plurality of sub-districts, still, generally the highest timing of peak value of the absolute value of correlation or real part being judged as is the timing of the SCH that sends from immediate sub-district, thus the connecting moves of beginning and base station.
Under the situation that adopts frame structure shown in Figure 24, can get at interval synchronously with half the time as the frame at the interval that has disposed SCH.By getting synchronously, carry out sign synchronization simultaneously with the SCH symbol.In addition, can pass through the fixedly position of SCH symbol in subframe, carrying out simultaneously with the subframe is the synchronous of cycle.
Among Figure 12, stopped by timing test section 103 in the symbol period synchronously after, with aforesaid symbol period coupling, from each symbol, remove the GI portion that before significant character, adds by GI removal portion 104.After symbol behind the removal GI is converted to parallel signal by S/P (serial) converter section 105 from serial signal, implements FFT by FFT portion 106 and handle.
The data of SCH symbol portion are input to the SCH signal processing part 200 of treatment S CH data from FFT portion 106.In addition, pilot channel and the data channel that comprises the control information of travelling carriage are input to extended code multiplier 107 from FFT portion 106.Owing to when travelling carriage carries out initial connection to the base station, do not obtain cell unique information and sector intrinsic information, so preferentially carry out the processing in the SCH signal processing part 200.In the SCH signal processing part 200, the data of SCH symbol are input to 3 multipliers 212 corresponding with the sector number of present embodiment, SCH data demodulates portion 230 respectively simultaneously from FFT portion 106.
In multiplier 212,, implement to generate or the multiplying each other of sector own code (Fig. 8 (b)) of storage by sector own code generating unit 211 by control information from MAC portion (not shown).In each multiplier 212, calculate from the complex conjugate of the sector own code of sector own code generating unit 211 inputs, and to from the odd number SCH subcarrier of the SCH symbol of FFT portion 106 input ( sub-carrier indices 1,5,9 ...) multiply by the symbol of complex conjugate, make its when the base station sends with multiply by the sector own code after subcarrier corresponding.Further, be input to addition portion 214, implement the homophase addition having multiply by the data after the complex conjugate.That is, addition is as the data that multiply by 3 subcarriers after the complex conjugate in 6 subcarriers of the repetition period of sector own code.The situation of this processing as the processing 1 of Figure 14, handle shown in 2.
Figure 14 is the figure of particular content of the contrary extension process of expression sector identification usefulness.Among Figure 14, sector own code shown in the px presentation graphs 8 (b), x represents the index of sector.In addition, f represents transfer path, is certain in the frequency band as 9 subcarriers implementing the contrary carrier spacing of expanding.
Further, among Figure 12, making the data of having implemented after the contrary extension process is 1/3 times, and all the data behind the side are input to sector power judging part 220.From the data behind all sides of each sector is the index that the received power in the sector power judging part 220 is judged.
Sector power judging part 220 is relatively from the data of the expression addition result imported with the corresponding respectively addition portion 214 in 3 sectors.And, determine the highest sector of received power, be the sector that reception environment is connected best.Notify the sector detection result by control signal to MAC portion.
On the other hand, among Figure 12, come demodulation from the SCH symbol data (data cell unique information multiply by sector common code after) of FFT portion 106 to 230 inputs of SCH data demodulates portion by demodulation method shown in Figure 15.
Figure 15 is the figure that the demodulation process of explanation cell unique information is used.The processing of Figure 15 is the subcarrier that the complex conjugate of sub-district own code that will distribute to the subcarrier of low frequency side in a pair of subcarrier multiply by the high-frequency side, thus, comes the processing of demodulation relative phase difference information (that is cell unique information).
In the SCH data demodulates portion 230 among Figure 12, will from the low frequency side odd number SCH subcarrier of SCH symbol ( sub-carrier indices 1,5,9 ...) the complex conjugate of data and the even number SCH subcarrier of high-frequency side ( sub-carrier indices 3,7,11 ...) data multiply each other.
As shown in figure 15, the ideal value of multiplied result is made of transfer path f between each sector, travelling carriage and sub-district own code c.Because c is that amplitude is 1 plural number, so can obtain easily by deriving phase place.Here, the x of fxy represents sector ID (be equivalent to the sector identifier, be also referred to as sector index), and y is the index of the frequency direction of 2 subcarriers on transfer path after multiplying each other.The transfer path that is assumed to 2 sub-intercarriers after multiplying each other is identical.
When the demodulation cell unique information, by the symbol sebolic addressing of SCH data demodulates portion 230 according to cell unique information, generation might be carried out duplicating of candidate symbol (Cn) that use in the notice of cell unique information by the base station.And, also can judge and obtain cell unique information by getting cross-correlation with the result who in fact calculates by preceding method.In fact, preferably carry out judgement based on this cross correlation process.
In the present embodiment, in frame, be provided with the SCH symbol on two positions, and become, get synchronous state with 1/2 cycle of frame when postponing relevant sign synchronization.In order to carry out with the frame period synchronously, make the information of representing by aforementioned sub-district own code c comprise which the information of SCH in the frame.Perhaps, also can be assignment information on certain symbol at the time location of distance SCH.
In addition, as previously mentioned, so the symbol lengths very many symbolic number of extended code information because of constituting it is the inadequate situation of the amount of information that exists the notifying cell intrinsic information to use.That is,, be not enough to the amount of information of notifying cell intrinsic information according to the number of the subcarrier that is used for SCH, thus also there is the information of not notifying the intrinsic extended code in expression sub-district, and the notice expression will be divided into the situation of several groups information for a short time.In this case, need carry out following detection to all extended codes of thinking of assigning to the sub-district in the group.
That is, in the extended code of sub-district detects, use pilot channel, generate the reproducing signals behind the symbol (sub-district own code and orthogonal code) that multiplies each other pilot channel and multiply each other with it.For the reproducing signals of this generation cross-correlation, the extended code candidate of all sub-districts in the aforesaid cell set is carried out coherent detection with actual received signal.When all coherent detection stops, with expression the extended code candidate of high correlation be judged as the extended code of in immediate base station, using.This is general method.But, in the present embodiment,, can shorten cross-correlation test and handle by only using the orthogonal code of judging the sector of decision by aforesaid sector.
The symbol sebolic addressing of sub-district own code c preferably with the good symbol of their cross correlation of symbol of the information of other sub-districts of expression.On concrete, preferably Walsh-Hadamard symbol sebolic addressing or Generalized Chirp Like (GCL) symbol sebolic addressing etc.
Will by as above like this SCH data after the demodulation deliver to MAC portion.In the MAC portion, can receive, carry out and being connected of base station according to this information.Generally, the reception of the data channel that sends from the base station need be following such structure.Also can use receiving circuit in addition.
Among Figure 12, by the intrinsic extended code in the sub-district of containing in the cell unique information, expand by FFT portion 106 and implemented data channel and pilot channel after FFT handles.Therefore, in extended code multiplier 107, multiply by the complex conjugate of the intrinsic extended code in sub-district.From the intrinsic extended code in extended code generating unit 111 output sub-districts.In extended code generating unit 111, by the cell extension sign indicating number of selecting from a plurality of extended codes from the control signal on upper strata to wish.
In addition, the intrinsic orthogonal code in sector is also selected by extended code generating unit 111 simultaneously, and is input to extended code multiplier 107.By extended code multiplier 107 orthogonal code and the pilot channel of being imported multiplied each other.To multiply by data behind the symbol, pilot channel as reference signal, and is implemented to be input to demodulation section 109 after the subcarrier compensation by subcarrier compensation section 108.In demodulation section 109, carry out the demodulation of data channel, further, carry out error correction decoding by error correction decoding portion 110.
(the 3rd execution mode)
Then, the 3rd execution mode of the present invention is described.In aforesaid the 2nd execution mode, every frame inserts SCH (Figure 24), follows in this 1 subcarrier of being separated by gap carrier wave (Figure 25) is set.
In the present embodiment, as shown in figure 16, will except that the subcarrier the subcarrier that is positioned at band center (DC subcarrier) as the SCH subcarrier.In addition, the configuration of the SCH symbol in the frame as shown in figure 19, the identical SCH symbol of continuous 2 symbols configuration on the position of the special time in frame.Figure 19 is the figure of the frame structure in expression the 3rd execution mode.
That is, in the present embodiment, compare, because the number of SCH subcarrier is 2 times, so it is elongated to can be used for the symbol lengths of cell unique information with aforesaid the 2nd execution mode.Therefore, can the many SCH signals of sent-received message amount.
Figure 16 is the figure that expression has distributed the subcarrier of SCH.In the present embodiment, SCH constitutes on frequency axis as shown in figure 16 like this.That is, the SCH data that Figure 16 pays close attention to a plurality of symbols of the signal frame that formation sends from the base station are illustrated, and the longitudinal axis is represented frequency axis, transverse axis express time axle.Each subcarrier as shown in figure 16 will be except that the subcarrier of the subcarrier the center subcarrier (DC subcarrier) as distribution SCH data.
Below, several the establishing as 2n of the subcarrier (SCH subcarrier) that constitutes SCH carried out explanation afterwards.Figure 17 (a) and (b) are figure of the data structure of the SCH in expression the 3rd execution mode.Figure 17 (a) is the figure of the expression configuration of sector common code on frequency axis of multiplying each other with SCH, and Figure 17 (b) is the figure of 3 sector own codes of expression.
Figure 17 (a) expression sector common code.To each SCH subcarrier ( sub-carrier indices 1,2,3 ...) distribution S 0S 0Be with A*exp (jw)) arbitrary value of expression.Here, A represents that amplitude, j represent that imaginary unit, ω represent phase place.Sector common code S 0In all sectors in each sub-district (being 3 sectors in the present embodiment) is public.Same with aforementioned the 2nd execution mode, by with known S 0Be used for travelling carriage, and the decoding of the sub-district own code after can be used for multiplying each other with SCH.
Figure 17 (b) expression with the sector own code as the example under the situation about in 3 sectors, using of the 3rd execution mode.Symbol is intrinsic symbol in each sector in same sub-district, and symbol 1 to 3 is corresponding with 3 sectors as the 2nd execution mode.The corresponding relation of the sector ID in known in advance these symbols in travelling carriage and base station and the same sub-district.The symbol sebolic addressing that multiply by the SCH subcarrier as the sector own code from lower frequency side odd number SCH subcarrier ( sub-carrier indices 1,3,5 ...) to even number SCH subcarrier ( sub-carrier indices 2,4,6 ...) phase difference in each sector be 0 the degree, 0 the degree, 0 the degree, the phase difference from even number SCH subcarrier to odd number SCH subcarrier each sector be 0 the degree, 120 the degree, 240 the degree.Each symbol is that amplitude is 1 symbol.Because these symbol sebolic addressings are 6 repetitions (6 was 1 cycle), so SCH sub-carrier number 2n is 6 integral multiple.
If see 1 repeating part (6 point) of these sector own codes, then the complex conjugate of symbol sebolic addressing multiply by each symbol sebolic addressing arbitrarily, 1 is come average addition 3 points if be separated by, then under the situation that multiply by the symbol sebolic addressing outside the selected optional sign sequence, itself and be 0, multiply by under the situation of symbol sebolic addressing arbitrarily, itself and be 3.
For example, if consider (the exp (j0 π) of symbol 1, exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π)), (the exp (j0 π) of symbol 2, exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), exp (j4 π/3)) and (exp (j0 π) of symbol 3, exp (j0 π), exp (j4 π/3), exp (j4 π/3), exp (j2 π/3), exp (j2 π/3)) situation, if as the symbol 2 of symbol selection arbitrarily, the complex conjugate of then symbol 2 becomes (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), exp (j4 π/3)), the complex conjugate of symbol 2 multiply by the symbol of symbol 1 behind the symbol 3 respectively and is respectively (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j4 π/3), exp (j4 π/3)), (exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π), exp (j0 π)), (exp (j0 π), exp (j0 π), exp (j2 π/3), exp (j2 π/3), exp (j2 π/3), exp (j2 π/3)).
Further, if the odd number and the even number of each point of vector addition then becomes (0,0), (3,3), (0,0) respectively, for the symbol sum that has outside the symbol of selecting as symbol arbitrarily 2 is the symbol sebolic addressing of 0 this feature.This means, under the situation of the SCH of the identical data after each sector in same sub-district sends the orthogonal code (Figure 17 (b)) that multiply by each sector correspondence simultaneously, by receive behind the SCH travelling carriage by whenever predetermined 3 come contrary expansion SCH, and separable from any sector signal and from the interference signal of adjacent sectors.
Figure 18 is the figure of the configuration of the sub-district own code in expression the 3rd execution mode.Because symbol sebolic addressing shown in Figure 180 is to transmit the symbol sebolic addressing that cell unique information is used, thus symbol sebolic addressings different in each sub-district used, but use identical symbol sebolic addressing between the sector in same sub-district.So-called cell unique information is meant information and the antenna number of base station and the information of system bandwidth etc. of the intrinsic extended code of using in the sub-district, be included in information required when travelling carriage is initial to be connected with the base station.
But, because extended code information is got very many symbolic numbers because of its symbol lengths, so exist in the inadequate situation of amount of information in the symbol shown in Figure 180.In this case, can also be with several sub-districts as group, and in belonging to the sub-district of this group, generate symbol sebolic addressing by identical information.Under this situation, because can not be by discerning the intrinsic extended code in sub-district fully, so discern the intrinsic extended code in final sub-district by the pilot channel that multiply by after the extended code from the information of SCH.
Symbol sebolic addressing shown in Figure 180 from lower frequency side with 6 o'clock as one group of formation.In 6, to the identical symbol of odd number SCH subcarrier allocation, to the symbol of even number SCH subcarrier allocation after the sub-district own code multiply by the symbol that odd number distributes.Symbol to the odd number subcarrier allocation is identical in 6 o'clock, but does not need identical with the symbol of use in other 6.The each point amplitude separately that forms symbol sebolic addressing is 1.In addition, symbol lengths is under the situation of 2n, to need the symbol sebolic addressing of n symbol lengths in order to form the even number subcarrier at the SCH sub-carrier number.
Because symbol lengths depends on the SCH sub-carrier number, so under the fully long situation of SCH sub-carrier number, but how general quantity form the better symbol sebolic addressing of correlation properties.Therefore, as previously mentioned, also be not that the symbol sebolic addressing of being organized by expression sub-district ID constitutes, but constitute by the symbol sebolic addressing of the information that comprises direct representation sub-district ID.
The symbol that multiplies each other on the subcarrier that constitutes above-mentioned SCH distributes identical symbol in 2 continuous symbols.Above-mentioned 3 kinds of symbol sebolic addressings that symbol sebolic addressing is the formation SCH in the 3rd execution mode multiply by these symbol sebolic addressings and send SCH from the transmitter of each sector.
Because the sending method of the SCH in the present embodiment and disclosed the 2nd execution mode of structure and front of transmitter are same, omit explanation.With the difference of the 2nd execution mode be the symbol (with reference to Figure 17, Figure 18) that generates of the sector own code generating unit 63 in the SCH data processing division 60 and from the SCH data of MAC portion 10 inputs.In addition, in the present embodiment, 2 symbols send identical SCH symbol (with reference to Figure 19) continuously.Figure 19 is the figure of the configuration of the SCH in the expression frame interval.Execution mode is substantially the same publicly with the front for receiver structure in the present embodiment and method of reseptance.But, in the timing test section 103 (Figure 13) of the 2nd execution mode, by behind the signal delay 1/2 significant character interval that will be received and signal multiplication, and detect the position of SCH symbol, but in the present embodiment, by behind 1 symbol of symbol delay that will be received with signal multiplication, thereby detect the symbol of SCH.
Below, the order of Cell searching is described.Travelling carriage and the 2nd execution mode are same, receive the wireless signal that sends from the base station by antenna part 100.101 pairs of wireless signals that received of simulation receiving circuit portion are converted to the base band frequency band from radio band.A/D (analog/digital) converter section 102 is digital signal for the signal that is transformed to the base band frequency band from analog signal conversion.
Then, regularly test section 103 carries out the SCH detection processing that sign synchronization is used according to the reception data that are converted to numerical data by A/D converter section 102.And, multiply each other by the complex conjugate and the reception data of the signal behind 1 symbol of signal delay that will be received, when repeating, the waveform of same-sign detects peak value.That is, under the situation that becomes the identical SCH symbol timing that has received aforesaid 2 symbols, detect peak value.Detect a plurality of peak values by the signal from a plurality of sub-districts, still general that the peak value of correlation is the highest timing is judged as the timing of the SCH that sends from nearest sub-district, and the connecting moves of beginning and base station.
In the present embodiment, because the SCH of 2 symbols is configured in the end of frame, so by detecting the correlation peak of SCH signal by aforesaid method, and can carry out frame synchronization.Simultaneously, carry out sign synchronization synchronously by getting with the SCH symbol.And, after the synchronous termination that with the symbol is the cycle, be complementary with aforesaid symbol period, by GI removal portion 104, remove the GI portion that before significant character, adds from each symbol.The symbol of removing behind the GI is converted to parallel signal by S/P (serial) converter section 105 from serial signal, and implements the FFT processing by FFT portion 106.
The data of SCH symbol portion are input to the SCH signal processing part 200 of treatment S CH data from FFT portion 106.And, from FFT portion 106 pilot channel and the data channel that comprises the control information of travelling carriage are input to extended code multiplier 107.Owing to, do not obtain cell unique information and sector intrinsic information, so preferentially carry out the processing in the SCH signal processing part 200 when travelling carriage carries out initial connection to the base station.In SCH signal processing part 200, import the data of SCH symbol respectively to corresponding with the sector number of present embodiment 3 multipliers 212 and SCH data demodulates portion 230 from FFT portion 106.By control information, to the sector own code of multiplier 212 inputs by 211 generations of sector own code generating unit or storage from MAC portion (not shown).
In each multiplier 212, calculate from the complex conjugate of the sector own code of sector own code generating unit 211 inputs, to from each odd number subcarrier of the SCH signal of FFT portion 106 input ( sub-carrier indices 1,3,5 ...) multiply by the symbol of complex conjugate, make it when sending from the base station, corresponding with the subcarrier after multiply by the sector own code.Processing 1 this situation of expression of Figure 20.Figure 20 is the figure that the particular content example that the related operation of sector own code handles has been used in expression.Be input in the contrary extension 210 having multiply by the data after the complex conjugate, implement contrary extension process.Contrary extension process is carried out (handling 2 with reference to Figure 20) by addition as the data that multiply by 3 subcarriers after the complex conjugate in 6 subcarriers of the repetition period of sector own code.
Further, the data of having implemented after the contrary extension process are established do its 1/3, the data of calculating behind equal sides also are input to sector power judging part 220.Will be from the index of the data behind all sides of each sector as the received power judgement of sector power judging part 220.Among Figure 20, px represents the sector own code shown in Figure 17 (b), and x represents the index of sector.In addition, f represents transfer path, is certain in the frequency band as 5 subcarriers implementing the contrary subcarrier spacing of expanding.
In the sector power judging part 220, obtain described value from each contrary extension 210 corresponding and compared, thereby the highest sector of decision received power, be the sector that reception environment is connected best with 3 sectors.Should determine to be notified to MAC portion as control signal.
On the other hand, will carry out demodulation to the SCH symbol data of SCH data demodulates portion 230 inputs by demodulation method shown in Figure 21 from FFT portion 106.Figure 21 is the figure of the demodulation method of the sub-district own code in expression the 3rd execution mode.In the SCH data demodulates portion 230, will from the lower frequency side odd number SCH subcarrier of SCH symbol ( sub-carrier indices 1,3,5 ...) the complex conjugate of data and the even number SCH subcarrier of this high frequency side ( sub-carrier indices 2,4,6 ...) data multiply each other.
As shown in figure 21, the ideal value of multiplied result is made of transfer path f between each sector, travelling carriage and sub-district own code c, because c is that amplitude is 1 plural number, so can obtain easily by deriving phase place.Here, the x of fxy represents sector ID, and y is as the index of the frequency direction of 2 subcarriers on transfer path after multiplying each other.The transfer path that is assumed to 2 sub-intercarriers after multiplying each other is identical.
When the demodulation cell unique information, by the symbol sebolic addressing of SCH data demodulates portion according to the cell unique information of following expression, generation might be duplicated by the candidate that the base station carries out using in the notice of cell unique information, in fact also can get cross-correlation with the result who calculates by aforesaid method, and judgement obtains cell unique information.Further, in the 3rd execution mode, because 2 symbols send identical SCH symbol continuously, thus between 2 sign fields, carry out described demodulation continuously, thus can carry out the higher demodulation of reliability.
With as above like this SCH data after the demodulation deliver to MAC portion.In MAC portion, can receive according to this information, and carry out and being connected of base station.In the 3rd execution mode, on last 2 symbols of 1 image duration, dispose SCH.Thus, on time shaft, have and periodically dispose SCH, simultaneously, send continuously at 2 symbols under the situation of identical SCH symbol, because the amount of information increase, so, can carry out the higher demodulation of reliability at receiver side.In addition, owing to can use the subcarrier of whole frequency band to send SCH, so sending by each symbol under the situation of different information, can increase the symbol lengths of the transmission that is used for cell unique information (relative phase difference information), can send more cell unique information.
(the 4th execution mode)
Then, the 4th execution mode of the present invention is described.In the present embodiment, the cross-correlation method of the time waveform of the replica code by having utilized the sector own code is described, carries out the example that the timing of the SCH in the 1st step of Cell searching detects.
In the disclosed in front the 2nd and the 3rd execution mode, in the 1st step of aforesaid 3 stage Cell searchings, use the time correlation of SCH to detect, carry out sign synchronization, frequency deviation, 1/N frame timing detection.In the present embodiment, the cross correlation process of the reproducing signals that generates by received signal with by travelling carriage, the timing of carrying out the SCH in the 1st step of aforementioned 3 stage Cell searchings detects.In order to make it become possibility, need on the data structure of SCH, work hard.
The SCH method for detecting position of the 1st step shown in the present embodiment can be used as it is the frame structure shown in the 2nd or the 3rd execution mode and the configuration of SCH is realized.The 2nd step or the 3rd step also can be implemented equally with aforementioned embodiments.
In addition, under situation about adopting as the data structure of the SCH of present embodiment, with SCH periodically be configured in 1 image duration the aspect identical with aforementioned disclosed execution mode.Therefore, can implement to have used and the SCH position probing of the same correlation method of the 2nd and the 3rd execution mode the establishment of the autocorrelative sign synchronization of having utilized repetitive pattern (that is, based on).But, in the detection of the SCH position of having used cross-correlation, owing to can obtain sharper correlation peak, so can carry out the detection of more high-precision SCH position.
The SCH timing detection method of the 1st step in the present embodiment is the detection method that has been suitable for the detection method that is called cross-correlation test (or copy detection) method.As mentioned above, compare with the Autocorrelation Detection method of the continuous SCH waveform of the utilization shown in the 3rd execution mode, can detect its detection peak sharplyer with the 2nd.That is, present embodiment is compared with the 3rd execution mode with the aforementioned the disclosed the 2nd, can use the 1st step diverse ways with 3 stage Cell searchings.Therefore, can carry out more high-precision SCH timing detection.
In the present embodiment, with the communication mode of the same down direction of the 2nd execution mode in use the ofdm communication mode.In addition, the structure of communication frame and Resource Block and Figure 22 and shown in Figure 28 be same form.At first, synchronous with physical channel (SCH) for as the feature of present embodiment illustrates its concrete structure.
Figure 29 (a)～(c) and the 2nd execution mode are same, are respectively the figure that the data structure of the SCH that sends simultaneously from 3 sectors in the same sub-district of explanation is used.Figure 29 (a) is the figure of the distribution of the sector common code on the expression frequency axis, and Figure 29 (b) is the figure of the structure of 3 sector own codes of expression, and Figure 29 (c) is the concept map of expression as the formation base of sector own code, is illustrated in the vector on the plural phase plane.Basic structure and the 2nd execution mode are same, but a part constitutes the symbol difference, makes it can be suitable for the cross-correlation test method in the 1st step of 3 sections Cell searchings.
Signal indication shown in Figure 29 (a) constitutes the sector common code of SCH.Distributed S by per 6 on each SCH subcarrier 01To S On/6S 0It is arbitrary value with A*exp (j ω) expression.Here, A represents that amplitude (wherein in the present invention it being illustrated as 1), j represent that imaginary unit, ω represent phase place.
One of feature of present embodiment is different with the 2nd and the 3rd execution mode, and this sector common code is public symbol in all sub-districts.That is, the sector common code is also referred to as the sub-district common symbol.Another feature is also to be public in all sub-districts for the symbol element as phase reference in the own code of sub-district.Thus, can use the coherent detection of the replica code of sector own code.
That is, SCH multiply by 3 kinds of symbols (sector common code, sector own code, sub-district own code) back formation.Here, the sector common code also is public in the minizone, in addition, if in the own code of sub-district, symbol element as phase reference also is public in the sub-district, then about having multiply by as the subcarrier behind the symbol element of this phase reference, the symbol that multiplies each other comes down to (sector own code) and multiply by (symbol that all sub-districts are public) for (in all sub-districts public sector common code), (sector own code) and (in all sub-districts public sub-district own code).That is, about having multiply by as the subcarrier behind the symbol element of this phase reference, the 3 kinds of symbols that multiply each other, but 2 symbols in it are public in all sub-districts.Therefore, different only is the sector own code.It means the coherent detection of the replica code that can use the sector own code.
Therefore, at receiver side, prepare the time waveform of duplicating symbol of the sector own code corresponding, detect correlation peak by making the received signal that this time waveform of duplicating symbol multiply by before the FFT, thereby can detect the timing of the SCH in the received signal accurately with each sector.Therefore, can more efficiently carry out sector afterwards discerns and cell identification.Wherein, under the situation that has adopted this special SCH structure, in 1 image duration, periodically dispose the SCH this respect and do not change, so also can carry out position probing based on correlation method (that is, detecting the signal that makes after the receiving signal delayed scheduled period and the relevant method of primary reception signal).
Below, come with reference to the accompanying drawings specifically to be illustrated.At first, the sector own code is described.The example of Figure 29 (b) expression sector own code (establish sector number here, and be " 3 ").Here, use and the identical Reference numeral of Reference numeral shown in the 2nd execution mode.
Then, the symbol sebolic addressing that the transmission cell unique information is used is described.Figure 30 is the figure that expression transmits the structure of symbol sebolic addressing on frequency axis that cell unique information uses.In the present embodiment, by symbol sebolic addressing shown in Figure 30, carry out the transmission of cell unique information, but different with the 2nd and the 3rd execution mode, the symbol sebolic addressing public by the symbol sebolic addressing different in each minizone and minizone constitutes.On concrete, c shown in Figure 30 Ik(k is that 1 to n/6 natural number, n are the SCH sub-carrier numbers) is " in the minizone public symbol ", c 1(l is 1 to n/2 natural number) is " symbol that the sub-district is intrinsic ".
The symbol sebolic addressing of Figure 30 is one group of formation with 6 from the low frequency side successively.In 6, distribute " symbol that the minizone is public " to odd number SCH subcarrier ( sub-carrier indices 1,5,9).Distribute the symbol that the sub-district own code be multiply by behind the symbol that odd number distributes (that is the symbol of phase information that, has the symbol of relative phase benchmark) to even number SCH subcarrier ( sub-carrier indices 3,7,11).Symbol to the odd number subcarrier allocation is identical in 6 o'clock, but does not need identical with the symbol of use in other 6.
More than shown in 3 kinds of symbol sebolic addressings are the symbol sebolic addressings that constitute SCH, multiply each other these symbol sebolic addressings and constitute SCH.Send the multi-carrier signal that comprises SCH from the transmitter of each sector.
Because the sending method of the SCH of present embodiment is identical with aforementioned disclosed the 2nd execution mode with the structure of transmitter, omit explanation.Difference is the symbol (with reference to Figure 29, Figure 30) that is generated by the sector own code generating unit in the SCH data processing division 60 63.
Receiver structure in the present embodiment and method of reseptance are except that the 1st step, and be substantially the same with aforementioned disclosed execution mode.In the timing test section 103 (Figure 13) in aforementioned disclosed the 2nd execution mode, with the signal delay 1/2 significant character interval that is received, and and signal multiplication, thereby detect the position of SCH symbol.In the present embodiment, the signal that receives by calculating with generate by travelling carriage or the cross correlation value of the reproducing signals of the SCH symbol of storage, detect the symbol of SCH.Below, the explanation Cell searching order.
Travelling carriage and the 2nd execution mode are same, receive the wireless signal that sends from the base station by antenna part 100.101 pairs of wireless signals that received of simulation receiving circuit portion are converted to the base band frequency band with it from radio band.102 pairs of signals that are converted to the base band frequency band of A/D (analog/digital) converter section are digital signal from analog signal conversion.Then, regularly test section 103 is according to the reception data that are converted to by A/D converter section 102 after the numerical data, carried out SCH that sign synchronization uses and detects and handle.
Figure 31 is the block diagram of the structure (comprising correlator) of the Symbol Synchronization Circuit in the expression present embodiment.The Symbol Synchronization Circuit of Figure 31 has shift register 400, adder 402, the multiplier 404 of m level.In the Symbol Synchronization Circuit of Figure 31, received signal is input to the shift register 400 of m level.Generate by travelling carriage from the signal of this shift register 400 outputs, or with travelling carriage in the reproducing signals (r of storage in advance m: m is a natural number) complex conjugate multiply each other.
Derive reproducing signals according to the value that multiply by behind 3 symbols that constitute aforesaid SCH subcarrier, used odd number ( sub-carrier indices 1,5,9 about the SCH subcarrier ...) data.Because received signal is the data of time-axis direction, so reproducing signals too, calculates the signal of time-axis direction from the data of using aforesaid SCH subcarrier.
In the generation of this reproducing signals, use the odd number data of SCH subcarrier.As mentioned above, on the odd number subcarrier of SCH subcarrier, multiply by sector common code S public in all sub-districts 0(with reference to Figure 29 (a)) with as shown in figure 30, be illustrated in the symbol (as the symbol of phase reference) of the part of cell unique information public in all sub-districts.That is, in the odd number subcarrier of SCH subcarrier, only the sector own code shown in Figure 29 (b) is in the minizone difference.Therefore, in the present embodiment, the same number of 3 reproducing signals of generation and sector own code, and can carry out the detection of SCH time location by monitoring and the cross correlation value of received signal.
In addition, identical with the 2nd and the 3rd execution mode, detect a plurality of peak values by signal, but the general timing that the peak value of correlation is the highest is judged as the timing of the SCH that sends from immediate sub-district from a plurality of sub-districts, and the connecting moves of beginning and base station.
As mentioned above, in the 1st step of the Cell searching of present embodiment, utilize the cross correlation value of received signal and reproducing signals to realize sign synchronization.The 2nd step of the small region search method in the present embodiment and the 3rd step are because identical with aforementioned disclosed the 2nd execution mode, so omit explanation.
(the 5th execution mode)
Then, the 5th execution mode of the present invention is described.In the present embodiment, following 1.～5. each points are described.
[1. the 1st step of Cell searching specializes]
Here, the cross-correlation method of the time waveform of the replica code of expression by having utilized the sector own code carries out the concrete change of the timing detection technique of the SCH in the 1st step of Cell searching.This is the variation of the 4th execution mode.That is, in aforementioned disclosed execution mode, the total multiple of sub-carrier number (except that the DC subcarrier) with 6 is as the basis, but in the present embodiment, concrete regulation is that subcarrier is 75 (except that the DC subcarriers).About having multiply by as the subcarrier behind the symbol element of phase reference, in fact (sector own code) multiply by (symbol that whole sub-district is public) aspect with utilize this subcarrier and detect the timing aspect of SCH by cross-correlation method identical with the 4th execution mode.But, in the present embodiment, comprise detection to cell unique information and do not have the subcarrier of contribution (multiply by virtual sign after subcarrier).In the method that not only can use based on cross-correlation, and can use the aspect of correlation method identical with the 4th execution mode.
[2. based on formation] as the characteristic time waveform of the balanced configuration of the subcarrier of phase reference
The subcarrier that multiply by as the symbol element of phase reference is benchmark with the centre frequency, and balanced configuration is in low frequency side and high-frequency side.Because having multiply by as the subcarrier behind the symbol element of this phase reference is to be used for the SCH subcarrier that the SCH based on cross-correlation method regularly detects, so in the following description, is called " cross-correlation test SCH subcarrier " sometimes.In the 4th execution mode, owing to be to be the execution mode that benchmark is distributed, so do not need to satisfy the condition of the present embodiment that is the benchmark configuration of carrying out symmetry with the centre frequency with the low frequency side.
Using the SCH subcarrier with predetermined space cross-correlation test, is that benchmark carries out balanced configuration with the centre frequency.With the time waveform of the signal of these subcarriers coupling during 1 symbol in (during having disposed SCH), for example, by using from the 2nd of center, the 6th, the 10th ... subcarrier, come the identical and opposite polarity waveform of repetition amplitude, make it by every (1/4) individual symbol, (B is a signal amplitude arbitrarily: reference waveform), have characteristic periodic time waveform and form for " B ", " B ", " B ", " B ".In addition, by using from the 4th of center, the 8th, the 12nd ... subcarrier, be that ' (D is a signal amplitude arbitrarily: such time waveform reference waveform) for " D ", " D ", " D ", " D " thereby form by per 1/4 symbol.Therefore, at receiver side, the doubling time waveform that preparation is used for cross-correlation test also can be the time waveform that changes as " B ", " B ", " B ", " B " or " D ", " D ", " D ", " D " by every (1/4) symbol.That is, can detect the signal waveform of the feature of (1/4) symbolic unit.Therefore, can simplify the structure of correlator.
[the 3. sector of the 2nd step of Cell searching identification]
Here, implement to have used the contrary expansion of sector own code, and realized detecting the raising of the degree of freedom of motion of the sector of representing maximum related value.Be (the sector common code that all sub-districts are public), (sector own code) and (the sub-district own code that all sub-districts are public) aspect with the symbol that multiply by as the subcarrier behind the symbol element of phase reference (cross-correlation test subcarrier), identical with the 4th execution mode.But, in the present embodiment, in total subcarrier as whole subcarriers of phase reference, the public sub-district own code in the sector common code (fiducial mark) that all sub-districts are public and all sub-districts is established work " 1 " simultaneously.In the 4th execution mode, the sub-district own code (C of Figure 30 I1, C I2C In/6) be new symbol by 6 subcarriers.That is, 6 subcarriers at first are C I1, 6 subcarriers following are C I2Under this situation, when carrying out the contrary expansion of sector identification usefulness, need carry out contrary expansion successively by per 6 subcarriers.This aspect has limited the degree of freedom of sector identification.But, as mentioned above, if C I1, C I2C In/6All be " 1 " to have multiply by then that any one all is " 1 " as the sub-district own code behind the subcarrier of phase reference in total subcarrier.Therefore, multiply by this subcarrier for " 1 (the sector common code that all sub-districts are public) " * " 1 (the sub-district own code that all sub-districts are public) " * " sector own code (P1, P2, one of them of P3 :) " with reference to Figure 29 (b).As a result, having multiply by respectively is sector own code (P1, P2, one of them of P3) as the subcarrier of phase reference.Thus, need be not one group and carry out contrary expansion with 6 subcarriers, can be by selecting one of them subcarrier in total subcarrier, (P1, P2 P3), and implement contrary expansion with it to come the particular sector common code.Therefore, when discerning, do not implement the restriction of contrary expansion by per 6 subcarriers in the sector.As a result, improved the degree of freedom that sector identification is handled.
[4. be not that FFT handles the correlation peaks judgement of back based on contrary expansion, but carry out the investigation of sector identification by the cross-correlation of the time waveform before the FFT]
When adopting the symbolic construction of above-mentioned (3), (contrary expansion P3) also can utilize as above-mentioned (1) described cross-correlation method based on the doubling time waveform for P1, P2, the approaching sector of identification before FFT handles even do not used orthogonal code behind FFT.Promptly, before FFT handles, use the doubling time waveform (according to the time waveform of one of them formation of the symbol 1 of Figure 34, symbol 2, symbol 3) of sector own code to detect cross-correlation peak value, and can be by the specific symbol that peak-peak is provided (one of them of the symbol 1 of Figure 34, symbol 2, symbol 3), discern and be in immediate sector.Particularly, because in the 1st step of Cell searching, undertaken under the synchronous situation of the timing of SCH by duplicating correlation method, compare by the correlation of between different sector own codes, calculating to regularly synchronously the time, can carry out sector identification, carry out the sector recognized action so change after not needing.In addition, in order to be suitable for the cross-correlation method that has used this doubling time waveform, will be in travelling carriage, the various sectors own code that sends from the base station is known to condition.As the sector method of identification, be to use the coherent detection method of the contrary expansion that forms based on orthogonal code still to detect cross-correlation method based on the doubling time waveform, can consider that restriction on desired accuracy of detection and the circuit waits suitably to determine.
[5. the sector own code is not only the symbol that the Direct Recognition sector is used, and also comprises making clear of the intrinsic symbol situation of set of sectors]
If sector number is too much, then in order to ensure orthogonal code, need the group of more sub-carrier number, suppose the inadequate situation of sub-carrier number.Under this situation, can divide into groups a plurality of sectors and import the notion of " set of sectors ", and come specific this set of sectors with the sector own code.That is, it must be the symbol that the Direct Recognition sector is used that above-mentioned " sector own code " do not need, and can also be the symbol that the set of sectors of several sectors has been concentrated in expression.This situation is applicable to aforementioned disclosed all execution modes jointly.Below, specify these aspects respectively.
In aforementioned disclosed the 1st to the 4th execution mode, total sub-carrier number is illustrated as 2n+1 (comprising center DC subcarrier), but is that the situation of 76 (comprising center DC subcarrier) is illustrated more specifically in the present embodiment total sub-carrier number.In the present embodiment owing to except that the DC subcarrier, used 75 subcarriers, so be that low frequency side in the center frequency-band is different with high-frequency side sub-carriers number with the DC subcarrier.But, in the present embodiment,,, be 2n+1 (n=37 in the present embodiment) so the subcarrier of Shi Yonging comprises the DC subcarrier in essence because the phase difference of the subcarrier by constituting SCH comes the notifying cell intrinsic information.
In the present embodiment, same with the 4th execution mode, the timing of carrying out the SCH in the 1st step of 3 stage Cell searchings by the received signal and the cross correlation process of the reproducing signals that is generated by travelling carriage detects.In addition, by will be on certain location, and become the characteristic time waveform as the sub-carrier configuration of the object of the cross correlation process of having used reproducing signals.For realizing above situation, need work hard to data structure and the sub-carrier configuration of SCH.
The configuration that the SCH position probing method of the 1st step shown in the present embodiment can be used as it is frame structure shown in the 4th execution mode and SCH is realized.The 2nd step or the 3rd step can also be implemented with aforementioned disclosed execution mode equally.
According to the data structure of the SCH shown in the present embodiment, same with the 4th execution mode, realized the SCH of indication cycle's waveform (repetitive pattern) in 1 symbol that the Autocorrelation Detection method is required.Meanwhile, also can realize the applicable SCH that has adopted the detection method of the cross-correlation test method of using reproducing signals.The Autocorrelation Detection method generally can by than cross-correlation test method more simple circuit configuration realize, be known that the peak value that more gently detects correlation than cross-correlation test method but then.Because the cross-correlation test method can detect the peak value of correlation more shrilly, so can carry out time synchronized more accurately, is known that but then circuit structure and processing thereof complicate.Thus, in the communication mode of a part of WLAN, when time synchronized, carry out thick time synchronized, in finite time interval to a certain degree, carry out accurately true time synchronized by the cross-correlation test method by the Autocorrelation Detection method.Also can make in the present embodiment and use the same method.
The SCH timing detection method of the 1st step in the present embodiment can be suitable for 2 detection methods as previously mentioned.The Autocorrelation Detection method is the method for utilizing according to the repetitive pattern of the time zone in the SCH symbol that the position determined of the frequency domain of the subcarrier that uses among the SCH, thus with the 2nd or the 3rd execution mode in the method shown in detail almost do not change.Therefore, the following describes the cross-correlation test method of having used as the reproducing signals of the feature of present embodiment.In this cross-correlation test method, utilize characteristic signal waveform by the configuration formation of subcarrier.
In the present embodiment, with the communication mode of the same down direction of the 2nd execution mode in use the ofdm communication mode.The structure of communication frame and Resource Block is and Figure 22 and identical structure shown in Figure 28.At first, the synchronous physical channel (SCH) of using to as the feature in the present embodiment illustrates its concrete structure.
Figure 32 is the figure that represents 76 subcarriers using in the present embodiment by each function.As shown in the figure, the subcarrier that will be positioned at odd number from the DC subcarrier and the center at center is as the gap carrier wave, and in addition subcarrier is used as the SCH subcarrier.In the SCH subcarrier, will be from center odd number SCH subcarrier as being used for the subcarrier of cross-correlation test, subcarrier (the cross-correlation test SCH subcarrier) use of phase reference when being the detected cells intrinsic information.In addition, will from center even number SCH subcarrier as the subcarrier that multiply by cell unique information (below explanation, be called sometimes cell unique information detect use subcarrier) use.
Here, what is called is meant the integral body from center the 2nd, 6,10,14 from center odd number SCH subcarrier ... individual subcarrier.Wherein, the center is the 0th.In addition, what is called is meant the integral body from center the 4th, 8,12 from center even number SCH subcarrier ... individual subcarrier.
As mentioned above, cross-correlation test is benchmark with the centre frequency with the SCH subcarrier, in low frequency side and the balanced configuration of high-frequency side.Its cross-correlation test is that 3 subcarriers of being separated by dispose, and are the 2nd, the 6th, the 10th under the 0th the situation in centre frequency with subcarrier ...Be that this one side of benchmark is different with the 4th execution mode with the centre frequency.Among Figure 32, with the centre frequency be benchmark in high-frequency side and low frequency side, the cross-correlation test that is disposed is with the number difference of SCH subcarrier.That is, 10 in high-frequency side configuration (1)～(10), on the other hand, 9 in low frequency side configuration (11)～(19).But, detecting with SCH subcarrier paired (a pair of) use aspect with 4th execution mode identical with SCH subcarrier (as the subcarrier of phase reference) and cell unique information cross-correlation test.If as unit, then under the situation of Figure 32, use subcarrier (as the subcarrier of phase reference in 1 cross-correlation test of high-frequency side with a pair of subcarrier; Subcarrier among Figure 32 (10)) residue, and to this subcarrier (10) distribution virtual sign (being " 1 " in the present embodiment).
Figure 33 is that expression forms as having multiply by the subcarrier after the cell unique information (cell unique information detects and uses the SCH subcarrier) and as the figure of the relation of the right subcarrier of the subcarrier (cross-correlation test SCH subcarrier) of its phase reference.Under the situation of 76 subcarriers in the present embodiment, can use 37 subcarriers as the SCH subcarrier.Therefore, can be that 18 information P1 (x) (wherein, x=1～18) is set at the aforesaid subcarrier (cross-correlation test subcarrier) that becomes phase reference and cell unique information and detects relative value with subcarrier with symbol lengths.But, because paired assignment information, so in the present embodiment, 1 subcarrier is not used in allocation of symbols.That is, the symbol S19 of Figure 33 is virtual sign (being " 1 " in the present embodiment).
Figure 34 (a)～(c) is same with the 4th execution mode, and the figure that the data structure of the SCH that 3 sectors in the same sub-district send is simultaneously used is described respectively.Figure 34 (a) is the figure of the distribution of the sector common code on the expression frequency axis, and Figure 34 (b) is the figure of the structure of 3 sector own codes of expression.And Figure 34 (c) is the figure of expression as the basic concept of the generation of sector own code, represents the vector on the plural phase plane.
Basic structure and the 4th execution mode are same, but as previously mentioned, the subcarrier that is used for cross-correlation test is different with the position relation of the subcarrier that multiply by cell unique information on frequency axis.Shown in figure 32, the SCH subcarrier uses the even number subcarrier to high side of frequency and downside respectively from the DC subcarrier at center.
Figure 35 (a)～(d) is used to illustrate by the cross-correlation test on the frequency axis is worked hard with the configuration of SCH subcarrier and the SCH symbolic number on the time shaft, thus in making during the SCH symbol, to merge waveform in the time zone that forms behind a plurality of SCH subcarriers be the figure of the repetition of reference waveform (or the waveform behind this reference waveform that reverses) in during 1 symbol.
In the present embodiment (also comprising aforementioned disclosed execution mode), on frequency axis, with the next SCH subcarrier (for example, with reference to Figure 25) that periodically disposes of the frequency interval of 1 subcarrier of being separated by.If the SCH subcarrier during 1 symbol of synthetic so periodically configuration, then as Figure 35 (a), during 1 significant character (during 1 symbol, remove insert GI during after during), obtain repeating the time waveform (waveform in the time zone before the FFT) of reference waveform (being made as A) with (1/2) symbolic unit.Therefore, disclosed as described above execution mode is illustrated, if make time waveform postpone (1/2) significant character, and gets relevant with former time waveform, then obtains correlation peak.Therefore, can carry out the detection (based on the processing of the 1st step of the Cell searching of correlation method) of SCH position.
In addition, as shown in figure 19, on last 2 symbols of 1 image duration continuously under the situation of configuration SCH, shown in Figure 35 (c), during 2 adjacent significant characters in, repeat identical time waveform (being made as C).Therefore,, and get relevant with former time waveform, then can obtain correlation peak if make time waveform postpone 1 symbol.Therefore, can carry out the detection (based on the processing of the 1st step of the Cell searching of correlation method) of SCH position.
On the other hand, further be benchmark in the 5th execution mode, and use the SCH balanced configuration in low frequency side, high-frequency side cross-correlation test with the centre frequency.That is, subcarrier is as previously mentioned as the DC subcarrier the 2nd, 6,10,14 from the center ... individual (with the 2nd to start with, be separated by 3 afterwards).Thus, by coming the structure of repeating signal with 1/2 interval of significant character, and further interval with its (1/2), promptly the interval of whole (1/4) is a unit, forms the time waveform of the such feature of time waveform after the polarity inversion of repetition amplitude.On concrete, shown in Figure 35 (b), form B ,-B, B ,-time waveform that B repeats.This phenomenon to the frequency relation of orthogonal subcarrier, is caused by the objectivity of time orientation in the ofdm communication mode.Under this situation, can detect property eigenperiod, thereby come specific SCH position by being unit with (1/4) significant character.Can utilize this feature, generate the correlator that is used for cross-correlation test by simpler circuit.That is, can carry out high-precision SCH and regularly detect by the correlator of simple structure.
In addition, by the subcarrier of cross-correlation test with SCH is used as from DC subcarrier the 4th, 8,12,16 ... individual (with the 4th be beginning, be separated by 3 afterwards), and can be formed on the time waveform of feature of 1/4 interval repeating signal of significant character.On concrete, shown in Figure 35 (d), form the time waveform of D, D, D, D repetition.
Then, specify the sub-district own code that all sub-districts is public and all establish the simplest sub-carrier structure of work " 1 ".This sub-carrier structure is also thought the structure favourable to practicability.
Signal indication shown in Figure 34 (a) constitutes the sector common code of SCH.In the 4th execution mode, shown in Figure 29 (a), each SCH subcarrier is distributed s by per 6 points 01To s On/6In the present embodiment, to all SCH subcarrier allocation S 0Here, S 0It is arbitrary value with A*exp (j ω) expression.Here, A represents that amplitude (wherein, in the present embodiment it being illustrated as 1), j represent that imaginary unit, ω represent phase place.All SCH subcarriers be multiply by S 0, and make that the symbol as the subcarrier of phase reference is " 1 " (aftermentioned) without exception.Thus, the power calculation of sector identification usefulness needn't inevitable be carried out as unit with the group of 6 subcarriers.That is, the symbol 2 of lifting Figure 34 (b) be an example, can from one of them the SCH subcarrier on the frequency axis select " P1 ", " P2 ", each symbol of " P3 ", and carry out the Power arithmetic processing.But, will regard the identical situation of transfer path as condition owing to be used for the subcarrier of Power arithmetic processing, so if the subcarrier that is separated on the selection frequency axis, then its precision reduces, so preferably use adjacent subcarrier.
Present embodiment and the 4th execution mode are same, and the sector common code is a symbol public in all sub-districts.In addition, the symbol element as phase reference is also public in all SCH in the own code of sub-district.
SCH multiply by 3 kinds of symbols (sector common code, sector own code, sub-district own code) back and constitutes.Here, establishing the sector common code is public in the minizone, and the symbol element as phase reference in the own code of sub-district also is that the sub-district is public.The result, for multiply by as the subcarrier behind the symbol element of this phase reference, symbol after multiplying each other is (the sector common code that all sub-districts are public), (sector own code) and (the sub-district own code that all sub-districts are public), is essentially (sector own code) and multiply by (symbol that all sub-districts are public).That is,, multiply by 3 kinds of symbols, but 2 symbols wherein are public in all sub-districts for multiply by as the subcarrier behind the symbol element of its phase reference.Therefore, different only is the sector own code.It means the coherent detection of the replica code that can use the sector own code easily.
Therefore, in the receiving system side, prepare the time waveform of duplicating symbol of the sector own code corresponding with each sector, and multiply by received signal (FFT before signal) by the time waveform of this being duplicated symbol and detect correlation peak, thereby the timing that can high Precision Detection goes out the SCH in the received signal.Therefore, can more effectively carry out sector afterwards discerns and cell identification.
Further, in the present embodiment, can be configured in certain location, thereby repeat identical signal waveform at this 1/2 significant character length of interval shown in Figure 35 (b) by the sub-carrier positions that will be used for cross-correlation test.And be formed on the signal waveform of 1/4 significant character length of interval reverses sign.Thus, can get the simpler correlator configuration of having utilized this characteristic.
But, even under the situation that adopts this special SCH structure, between the SCH sign field, form the not variation of repetitive waveform this point, so can carry out position probing based on correlation method.This correlation method is the relevant method that detects the signal with the primary reception signal that make the receiving signal delayed scheduled period.
Below, specify with reference to the accompanying drawings.At first, the sector own code is described.The example of Figure 34 (b) expression sector own code (establish sector number here, and be " 3 ").Here, use and the identical symbol of symbol shown in the 4th execution mode.
Then, the symbol sebolic addressing that the transmission cell unique information is used is described.Figure 36 is that expression transmits the structure chart of symbol sebolic addressing on frequency axis that cell unique information is used.In the present embodiment, carry out the transmission of cell unique information by symbol sebolic addressing shown in Figure 36.C1 shown in Figure 36 (1 is 1 to 18 natural number) is " symbol that the sub-district is intrinsic ", to travelling carriage notifying cell intrinsic information.C1 is that amplitude is 1 symbol sebolic addressing.
The symbol sebolic addressing of the 4th execution mode shown in Figure 30 is one group of formation from low frequency side order with 6, but the symbol sebolic addressing of present embodiment shown in Figure 36 is for all to establish the specific form of work " 1 " with the symbol sebolic addressing cik of Figure 30.Thus, when the Power arithmetic of aforesaid sector, do not have the restriction that must select the group of 6 adjacent on the frequency axis each subcarrier, the degree of freedom that sector identification is handled increases.
More than shown in 3 kinds of symbol sebolic addressings are the symbol sebolic addressings that constitute SCH, multiply by these symbol sebolic addressings and constitute SCH.And, send the multi-carrier signal that comprises SCH from the transmitter of each sector.
Because the sending method of the SCH in the present embodiment is identical with aforementioned the disclosed the 2nd execution mode with the structure of transmitter, omit explanation.Difference is the symbol (with reference to Figure 35, Figure 36) that is generated by the sector own code generating unit in the SCH data processing division 60 63.
In addition, because the receiver structure in the present embodiment is identical with aforementioned disclosed the 4th execution mode with method of reseptance, so omit explanation.In addition, when adopting, even behind FFT, do not used orthogonal code (P1 as this symbolic construction of Figure 36, P2, contrary expansion P3) also can be identical with the processing of the 1st step of Cell searching, utilization is based on the cross-correlation method of doubling time waveform, and before FFT handles, discerns approaching sector.
Promptly, before FFT handles, doubling time waveform that can be by using the sector own code (time waveform of one of them formation of the symbol 1 by Figure 34, symbol 2, symbol 3) detects cross-correlation peak value, and the specific symbol that largest peaks is provided (one of them of the symbol 1 of Figure 34, symbol 2, symbol 3), and discern immediate sector.
Especially, in the 1st step of Cell searching, undertaken under the situation of SCH time synchronized, can be used as it is this result and carry out sector identification by cross-correlation method.That is, can carry out the SCH time synchronized, and judge received power height from which sector by this amplitude by position based on the time orientation of the correlation of cross-correlation test.
As sector identification method, accuracy of detection that consider to require and the restriction on the circuit etc., suitably determine to adopt based on orthogonal code against the coherent detection method of expanding or detection cross-correlation method based on the doubling time waveform.
In addition,,, need the more group of multi-subcarrier number, suppose the inadequate situation of sub-carrier number then in order to ensure orthogonal code if sector number is too much.Under this situation, can divide into groups a plurality of sectors and import the notion of " set of sectors ", and with specific this set of sectors of sector own code.That is, it must be the symbol that the Direct Recognition sector is used that above-mentioned " sector own code " do not need, and also can be the symbol that the set of sectors of several sectors has been concentrated in expression.It all is suitable in aforementioned disclosed all execution modes.
As described above,,, can not use pilot channel, and only carry out the identification of sector by contrary expansion and the coherent detection of having used SCH by the sector own code be multiply by the sector common code according to the present invention.Therefore, for sector identification, do not need the contrary expansion and the coherent detection of pilot channel to handle, and can reduce the capacity of the memory of the related operation that has been used to use pilot channel.
In addition, because the sector own code be multiply by SCH itself, also can in sector borders, get rid of the interference between the sector.Also can obtain the raising effect of the anti-fading characteristic that causes because of the randomization effect.The sector own code (orthogonal code) of distributing to each sector can be complementary with the increase of sector number, and increase its number and become easily, and can flexible corresponding sector strucre.
In addition,, and can guarantee the subcarrier of abundant number if by the sub-district own code be multiply by SCH, then only by SCH, but Direct Recognition sub-district ID just.Under this situation, the processing in 2 stages of the cell search process that comprises sector identification by only having used SCH can be shortened search procedure with regard to passable (2 stage Cell searching), compare with existing 3 stage Cell searchings.
In addition, structure by making the sub-district own code that multiply by SCH and sector own code and content, on frequency axis, be configured to the present invention like this, sector intrinsic information and cell unique information can not produce baneful influence each other, the reduction that also can inhibition information transmits precision.Each information of (that is, by parallel processing) demodulation thus, can further shorten the processing time of the Cell searching that comprises the sector search independently.
That is, make up the symbol of 2 m point quadratures and form the symbol that 2m is ordered, and the m point is used for sector identification, remaining m point is used for the identification of cell unique information.Cell unique information transmits by the phase information that (is preferably in disposed adjacent on the frequency axis) each other as the subcarrier that multiply by the sector own code key element of identical value, and can efficiently transmit sector intrinsic information and cell unique information, and at receiver side, can high efficiency separation both take out.
In addition, in small region search method of the present invention, can be by based on the periodic correlation method that has utilized SCH or based on the cross-correlation method of the time waveform of duplicating symbol of having utilized the sector own code, come the timing (the 1st step) of the SCH on axle detection time and, finish Cell searching thus based on the identification (the 2nd step) of frame identification, sector ID and the sub-district ID regularly of the information on the frequency axis.Therefore, compare, can shorten search procedure with existing 3 stage Cell searchings.
Further, used the contrary expansion of pilot channel and coherent detection only to separate the timing needs at data channel, in Cell searching, do not need, so can realize alleviating the effect of the burden (reduction of memory span etc.) of the hardware that the related operation that undertaken by pilot channel uses.In addition, because the sector own code that on SCH, superposeed, so, also can obtain resisting the interference between the sector and the strong such effect of ability of decline for sector identification.But, under the inadequate situation of sub-carrier number, the Direct Recognition of sub-district ID can not be only carried out in existence by SCH, and rest on the situation of the detection of sub-district ID group information, but in this case, as the processing of the 3rd step, can be by implementing to have used the contrary expansion and the coherent detection of pilot channel to discern sub-district ID.
In addition, by multicarrier transceiver of the present invention, in down link, can carry out high speed, jumbo transmission.
Like this,, shortened the required processing of cell search process that comprises sector identification, can reduce the capacity of the memory of storing the coherent detection result who has used pilot channel simultaneously according to the present invention.Further, the anti-interference of the cell search process that comprises sector identification or anti-fading characteristic are improved, can not increase the burden of transceiver, and can realize comprising more at a high speed and the Cell searching of more high-precision sector identification.
In addition, the present invention comprises various changes (concrete example, variation, application examples), and these change has contribution to the practicability based on the communication mode of E-UTRA (Evolved-UTRA).For example, in the processing (processing of SCH timing detection) of the 1st step of Cell searching, except that correlation method, also can adopt the cross-correlation method that is conceived to special time waveform.Under this situation, can obtain to simplify the such effect of structure of correlator.In addition, be for example " 1 " by will be as the symbol of the subcarrier of the phase reference on the frequency axis all unified, when having used contrary expansion of sector own code, the restriction that can not need 6 subcarriers to be necessary for a group.In addition, in the travelling carriage, when the various sectors own code that sends from the base station is known, can expand, and use cross-correlation to detect approaching sector detection based on the time waveform before the FFT based on contrary.When sector number increases,, can adopt " the intrinsic symbol of set of sectors " as " sector own code ".
In addition, the present invention can be used as the data structure formation of synchronizing channel (SCH).Promptly, data structure of the present invention is to be a plurality of sectors with a cell division, and the travelling carriage in this sub-district is sent down link signal by multi-carrier communication from the base station of administering described sub-district, in this down link signal, contain synchronizing channel (SCH), and this synchronizing channel (SCH) is the Cell searching that can be used for comprising sector identification, adopted the data structure of the described synchronizing channel (SCH) in the mobile communication system of multi-carrier communication mode, sector common code public in a plurality of sectors in same sub-district be multiply by by the different sector own code in each sector in the same sub-district, thus, can implement to use the Cell searching that comprises sector identification of synchronizing channel (SCH).
The data structure of the synchronizing channel that contains in the down link as the multi-carrier mobile communication mode (SCH: following, only be called " SCH ") adopts the new construction that comprises the sector intrinsic information.That is, the sector own code be multiply by the sector common code, and do not use pilot channel, can only carry out the identification of sector by contrary expansion and the coherent detection of having used synchronizing channel (SCH).That is, make in the past between the sector in a sub-district in (that is, nonopiate) SCH of public use to the sector be changed in the present invention by the intrinsic orthogonal channel in each sector, thereby can use SCH directly to carry out sector identification.Therefore,, do not need to have used the contrary expansion and the coherent detection of pilot channel to handle, can reduce the capacity of the memory of the related operation that has been used to use pilot channel for sector identification.In addition, because the sector own code be multiply by SCH itself,, also can obtain the raising effect of the anti-fading characteristic that causes by stochastic effects so in sector borders, also can get rid of the interference between the sector.In addition, if be increased in the information that SCH goes up stack, then only come the situation of Direct Recognition sub-district ID self also can enter into the visual field by SCH, under this situation, the processing (2 stage Cell searching) in 2 stages that can be by only having used SCH realizes comprising the cell search process of sector identification.
In addition, in the data structure of synchronizing channel of the present invention (SCH), described sector own code by with m (m is the natural number more than 2) symbol element as one group, simultaneously by this symbol element duplicate allocation of group is constituted on the subcarrier on the frequency axis, and the described sector own code of each sector correspondence is an orthogonality relation respectively each other.
Obviously the sector own code is carried out duplicate allocation by with m symbol element being one group unit on the subcarrier on the frequency axis, and this m symbol element quadrature on each sector.In addition, " symbol element " such term is for the ease of distinguishing " symbol string " this implication " as the symbol of upperseat concept " and using as each symbol (" as the symbol of subordinate concept ") of the structural element of this symbol string, for example, corresponding to contrary " point " of expanding unit of conduct.In addition, by symbol element being distributed to the subcarrier on the frequency axis, thereby for example make the phase change of subcarrier, thus, can transmit the sector intrinsic information.Here, for example, when m=3, sector 1 corresponding symbol M1 with symbol element (m1, m2 m3) as unit, are the cycle to stress subdivision from low frequency side direction high-frequency to join with 3 symbol elements, make its on frequency axis for M1=(m1, m2, m3, m1, m2, m3 ...).The symbol M 2 of sector 2 is the cycle with 3 symbol elements too, stresses subdivision from low frequency side direction high-frequency and joins, be M2=(m4, m5, m6, m4, m5, m6 ...).And, as the component unit of symbol M 1, M2 (m1, m2, m3) with (m4, m5, m6) orthogonal.
For example, under the situation that m1, m2, m3 complex conjugate separately be multiply by (contrary expansion) symbol M 1 and M2 and its result of addition,, represented high correlation, but be " 0 ", can distinguish two symbols and take out for symbol M 2 correlations for symbol M 1.An example of representing the basic thinking that the generation orthogonal code is used below.At plural phase plane (be the IQ plane, the I axle is equivalent to real number axis, and the Q axle is equivalent to axis of imaginaries), for example, be arranged to the amplitude that disposed of angles of 120 degree for 3 vectors of " 1 " (P1, P2, P3).Carrying out vector addition because these 3 vectors exist then is the relation of " 0 ", so if utilize this relation, then can generate easily (under the situation of m=3) orthogonal code.For example, symbol M 1=(P1, P1, P1), symbol M 2=(P1, P2, P3) with symbol M 3=(P1, P3, P2) orthogonal.For example, at symbol element (P1 with symbol M 2, P2, P3) complex conjugate separately multiply by respectively under the situation of symbol M 1, M2, M3 and each symbol element of addition, the correlation of symbol M 2 becomes " 3 ", but under the situation of symbol M 1, M3, the result, as each symbol element relativeness each other, only be the relation of still keeping vector P1, P2, P3.Therefore,, then become " 0 " as addition.In above example, utilization has 3 vectors of orthogonality relation, but if the vector number (for example increases, if use into 4 vectors of the angle of 90 degree), then can further increase the quantity of symbol element, thus, the number that can make the symbol of orthogonality relation is (in the above-mentioned example, the symbol that can generate is these 3 of M1, M2, M3, so symbolic number is " 3 ") more.Therefore, even the sector number that contains in sub-district increases, also can consider above-mentioned mode, and can generate the orthogonal code corresponding easily with this sector number.
In addition, the data structure of synchronizing channel of the present invention (SCH) further multiply by sub-district own code (expression " symbol of cell unique information " or comprise the situation of " symbol of the intrinsic sub-district ID in sub-district (or also having expression information as sub-district ID group public in several sub-districts) ") except described sector common code and described sector own code.
By the sub-district own code also be multiply by SCH,, then except sector identification, also can only come Direct Recognition sub-district ID by SCH based on SCH if satisfy the condition of wishing.Under this situation, the cell search process that comprises sector identification becomes by the processing in 2 stages of only having used SCH can finish (2 stage Cell searching), compares with existing 3 stage Cell searchings, can shorten search procedure.
In addition, sub-district own code described in the data structure of synchronizing channel of the present invention (SCH) is to represent the symbol of the cell unique information that travelling carriage is obtained when Cell searching.The sub-district own code is represented cell unique information (sub-district ID etc.) as can be known.
In addition, the data structure of synchronizing channel of the present invention (SCH) is distributed to subcarrier on the frequency axis with described sector common code, described sector intrinsic signal is distributed to the subcarrier that has distributed described sector common code, and each symbol element that constitutes described sub-district own code has represented to distribute the relative phase difference information between a pair of subcarrier in the subcarrier of described sector common code.Therefore, the distribution on frequency axis in the subcarrier of described sector common code, to a described symbol element that multiply by as phase reference of a pair of subcarrier, to another subcarrier multiply by the expression relative phase difference described symbol element.
Should understand by the information that is configured in 2 subcarriers relative phase difference each other on the frequency axis and transmit cell unique information (sub-district ID, antenna configurations, BCH (notification channel) bandwidth, GI (GuardInterval: protection interval, CP: be called Cyclic Prefix) length etc.).Promptly, it is not the absolute phase of each subcarrier of expression that the sub-district own code adopts, and employing is expressed as the mode of the relative phase of right subcarrier, thus, the generation of sub-district own code is become easily, by for example utilizing GCL symbol and Walsh-Hadamard symbol etc., corresponding with cell unique information, thus can be to the travelling carriage announcement information.If sub-carrier number is abundant, then can transmit all required information of cell identification by SCH.
In addition, in the data structure of synchronizing channel of the present invention (SCH), each symbol element that constitutes the described phase reference of conduct of described sector common code and described sub-district own code is the public symbol in all sub-districts.
Like this, because the cross-correlation method of replica code that can be by having used the sector own code is implemented the signal processing (detecting the signal processing that the position of the SCH in the received signal is used) in the 1st step of Cell searching, so the data structure of SCH is worked hard.Because SCH periodically disposed in 1 image duration, so can carry out position probing by having utilized its periodic " correlation method ", if adopt and used " cross-correlation method " that duplicates symbol, then can realize more sharp-pointed detection peak, the timing that can carry out more high-precision SCH detects.SCH multiply by 3 kinds of symbols (sector common code, sector own code, sub-district own code) and constitutes.Here, it is public in all sub-districts to establish the sector common code, and the symbol element as phase reference in the own code of sub-district is also public in all sub-districts.Thus, the symbol that multiplies each other with the subcarrier that multiply by as the symbol element of its phase reference is (the sector common code that all sub-districts are public), (sector own code) and (the sub-district own code that all sub-districts are public), (sector own code) be multiply by (in all sub-districts public symbol) in fact.That is,, multiply by 3 kinds of symbols, but 2 symbols wherein are public in all sub-districts for the subcarrier that multiply by as the symbol element of its phase reference.Therefore, different only is the sector own code.It means the coherent detection of the replica code that can use the sector own code.Therefore, in the receiving system side, prepare the time waveform of duplicating symbol of the sector own code corresponding, multiply by received signal (signal before the FFT) by the time waveform of this being duplicated symbol and detect correlation peak, thereby but high Precision Detection goes out the position of the SCH in the received signal with each sector.Therefore, can more efficiently carry out sector afterwards discerns and cell identification.But, even under the situation that adopts aforesaid SCH structure, the situation that periodically disposes SCH in 1 image duration does not change yet, so can carry out position probing based on correlation method (that is, detecting) with the relevant method of the signal after the receiving signal delayed scheduled period with the primary reception signal.
In addition, in the data structure of synchronizing channel of the present invention (SCH), described sector own code with 2m (m is the natural number more than 2) symbol element as one group, and with this symbol element duplicate allocation of group on the subcarrier on the frequency axis and constitute, simultaneously, a described 2m symbol element, by preparing m the symbol element group that 2 groups of technical schemes 2 or technical scheme 3 are put down in writing to each sector quadrature, and be distributed on the subcarrier and make each group is adjacent on frequency axis and constitute, and, to being m symbol element as in described 2m the symbol element of the component unit of described sector own code half, multiply by respectively and have the value identical, and expression is separately with respect to second half the symbol element of the described sub-district of formation own code of relative phase difference of m symbol element with this symbol element.
If SCH only is used for sector identification, then as mentioned above, only repeated configuration gets final product with the orthogonal code of m symbol element as component unit on frequency axis, but further, if also transmit cell unique information, then condition is tighter.That is,, will sector intrinsic information and cell unique information there be baneful influence each other as condition for stack on SCH transmits sector intrinsic information and cell unique information, in addition, in order to shorten the processing time, independently (that is, by parallel processing) to recover each information very important.In order to satisfy these conditions, here, prepare 2 groups of groups as m symbol element of the component unit of the orthogonal code of sector identification usefulness, and with these on frequency axis, divide 2 sections overlapping, with 2m symbol element as new component unit, and with these repeated configuration on frequency axis.M symbol element is used to discern the sector.Remaining m symbol element is used to multiply by the sub-district own code.Because the sub-district own code as mentioned above, the relative phase difference of representing a pair of subcarrier, so respectively remaining m symbol element be multiply by expression separately with respect to the symbol of the phase difference of other m symbol element with identical value (that is the symbol element of each sector own code).For example, consider on frequency axis, to divide 2 sections overlapping by (m1, m2, symbol element m3) constitute the orthogonal code of sector identification usefulness, and stress composite putting as unit from low frequency side direction high-frequency and form the situation of symbol.For example, establish and make symbol M 1=(m1, m2, m3, " m1 ", " m2 ", " m3 " ...)." " adds each other for the symbol element of distinguishing same value.And the expression with identical value of " m1 " be multiply by the low frequency side also be multiply by symbol " c2 ", " c3 " of expression with respect to the phase difference of m2, the m3 of low frequency side with respect to the symbol " c1 " of the phase difference of m1 respectively to " m2 ", " m3 ".
Thus, establish sector and cell identification and be M1=(m1, m2, m3, m1c1, m2c2, m3c3 with symbol M 1 ...).As mentioned above, (m1, m2, m3) since between the sector quadrature, take out so the sector own code is distinguished in multiplication that can be by complex conjugate and coherent detection.In addition, for example, for " m1c1 ", if multiply by the complex conjugate of m1 (multiply by symbol) as the subcarrier of phase reference, then can't see m1, and desirable " c1 " that goes out to have cell unique information also can take out equally for c2, c3, like this, basically the phase difference of the subcarrier by detecting another subcarrier relative phase benchmark, can demodulation sub-district own code (Cn) (wherein,, preferably obtaining and cross-correlation) as candidate's sub-district own code Cn in order to improve demodulation accuracy.Can distinguish independent (walk abreast) and implement to have used sector own code (m1, m2, contrary expansion m3) and based on the sector identification of coherent detection and based on cell unique information Cn (c1, c2, the c3 of the multiplication of complex conjugate ...) demodulation process.Transmission for cell unique information, for example, 2 subcarriers that will multiply by identical value " m1 " are as right, and with a subcarrier as phase reference, to another subcarrier allocation sub-district own code Cn, provide and the subcarrier of this phase reference between relative phase difference, so can only cell unique information be transmitted as the relative phase difference information between subcarrier, and can not be subjected to the interference of sector own code.Therefore, can efficiently transmit cell unique information.
In addition, in the data structure of synchronizing channel of the present invention (SCH), described sector own code with 2m (m is the natural number more than 2) symbol element as one group, and by this symbol element duplicate allocation of group is constituted on the subcarrier on the frequency axis, simultaneously a described 2m symbol element is by 2 groups of the preparations group with m symbol element of each sector quadrature of the present invention, and by the symbol element alternate configurations with described each group on subcarrier, make the identical value in each symbol symbol element each other on frequency axis disposed adjacent constitute, and, to as of the symbol element that on subcarrier adjacent on the frequency axis, distributes described identical value in described 2m the symbol element of the component unit of described sector own code, multiply by the symbol element of expression at another described sub-district of formation as the relative phase difference of the symbol element of phase reference own code.
In above-mentioned example, prepare the group (orthogonal code of sector identification usefulness: (m1 for example of 2 groups of m symbol elements, m2, m3)), and with these overlay configuration on frequency axis only, still, among the present invention, the same-sign key element of each group is disposed with the form of replacing combination each other, make it adjacent on frequency axis.For example, be made as symbol M 1=(m1, m1, m2, m2, m3, m3).And, to a sub-district own code that multiply by the expression relative phase difference of the symbol element of identical value.Therefore, establish sector and cell identification symbol and be M1=(m1, m1c1, m2, m2c2, m3, m3c3).And, use odd number symbol element (m1, m2, m3) carry out sector identification, by respectively to even number (m1c1, m2c2, m3c3) multiply by m1, m2, the m3 complex conjugate separately that the subcarrier with adjacent phase reference multiplies each other, thereby can demodulation sub-district own code (c1, c2, c3 ...).Advantage of the present invention is, in the sector own code list of elements before multiply by sub-district own code Cn, and the symbol element of identical value configuration adjacent one another are (that is configuration in pairs on frequency axis as " m1, m1 ", " m2, In2 ", " m3, m3 ").Because the identical symbol of value is configured on the contiguous frequency axis each other, so can regard as the subcarrier that has distributed this symbol transfer path transfer function also the equivalence (promptly, if separate by the position that on frequency axis, makes subcarrier, the transfer function difference of the transfer path of each subcarrier, then can rotate because of this influence phase place, this relative phase difference because of 2 sub-intercarriers becomes the error under the situation that transmits cell unique information, has the situation of the demodulation accuracy reduction of cell unique information).Among the present invention, owing to, improve so can be estimated as the identical probability of the transmission condition of each subcarrier, and can transmit cell unique information (that is the phase difference of 2 subcarriers) more accurately with 2 subcarriers disposed adjacent on frequency axis.
In addition, the data structure of synchronizing channel of the present invention (SCH) disposes at time-axis direction the individual subframe of Sf (Sf is a natural number) in 1 image duration, and a plurality of subchannels of configuration in axial all frequency bands of frequency, constitute the frame in the multi-carrier communication thus, described synchronizing channel (SCH) is configured on last 1 symbol that will be divided into described 1 image duration behind the individual time durations of Ss (Ss is the approximate number of Sf) separately, and this synchronizing channel (SCH) periodically disposes with a predetermined subcarrier spacing on frequency.Therefore, the time waveform that forms with the subcarrier coupling that is used for sector identification has the periodicity time waveform that repeats predetermined waveform in during 1 symbol, by utilizing the periodicity of this time waveform, can carry out detection based on the SCH position of correlation method.
On last (1) symbol of the time durations that obtained with the predetermined number five equilibrium 1 image duration, distribute SCH, disposed having distributed the subcarrier that is used for sector identification in the subcarrier of this SCH on frequency axis, to have periodically with predetermined space.According to this configuration, owing to the frequency relation of the orthogonal sub-carriers in the ofdm communication mode, be the symmetry of time direction, with these subcarriers be complementary the time waveform that forms have in can obtaining during 1 symbol repeat predetermined waveform periodic time waveform (for example, if establishing predetermined waveform is A, then repeat this time waveform of A) every 1/2 symbol.By utilizing the periodicity of time waveform, can carry out based on correlation method or based on the detection of the SCH position of cross-correlation method.
In addition, the data structure of synchronizing channel of the present invention (SCH), a plurality of subframes are disposed in 1 image duration at time-axis direction, and a plurality of subchannels of configuration in axial all frequency bands of frequency, thus, constitute the frame in the multi-carrier communication, described synchronizing channel (SCH) is the identical synchronizing channel of configuration on predetermined 2 symbols of described 1 image duration.Therefore, cooperate the subcarrier be used for sector identification and the time waveform that forms for during 2 symbols, have by the periodic time waveform that repeats same waveform as during per 1 symbol,, can carry out detection based on the SCH position of correlation method by utilizing the periodicity of this time waveform.
To on 2 symbols, distribute SCH, and distribute the subcarrier that is used for sector identification in the subcarrier of SCH, and on frequency axis, have periodically and disposed with predetermined space.Under the situation of the present invention, owing on 2 symbols, distributed SCH, so, the result (for example identical time waveform occurs on each symbol, if to establish 1 waveform during the symbol is C, then during 2 symbols in, by the time waveform of coming repetition C during each symbol).By utilizing the periodicity of the time waveform during this each symbol, can carry out detection based on the SCH position of correlation method.In addition, owing to can utilize the subcarrier of whole frequency band to send SCH, so under situation about sending, can increase the symbol lengths of the transmission that can be used for cell unique information (relative phase information), can send more cell unique information to the different information of each symbol.
In addition, small region search method of the present invention is the multi-carrier signal that receives from multicarrier transmitter apparatus, and utilize the synchronizing channel of the present invention (SCH) that comprises sub-district and sector identifying information that contains in this received signal, discern the small region search method of sector and sub-district, wherein, carry out by the 1st step and the 2nd step, in first step, by according to correlation method or cross-correlation method, detect synchronizing channel (SCH) position in the received signal, in the 2nd step, by contrary extension process based on the sector own code of the described synchronizing channel (SCH) that on frequency axis, disposes, detect the sector own code of the received power that provides maximum and discern the sector, and it is parallel therewith, the subcarrier that has distributed the described phase reference of conduct in the subcarrier of described synchronizing channel (SCH) by detection, with and the subcarrier of the corresponding symbol element that multiply by the sub-district own code of this subcarrier between phase difference come the described sub-district of demodulation own code, and further as required, carry out handling with the coherent detection of the sub-district own code of wanting to detect, thus, detected cells own code.
As mentioned above, the information of using by stack identification sector and sub-district on the SCH of the down link of multi-carrier communication, if satisfy predetermined condition (promptly, if sub-carrier number is abundant, by the relative phase difference between a pair of subcarrier, can all transmit the cell unique information that needs), then can not use pilot channel, and only use SCH, finish the Cell searching that comprises sector identification.Promptly, by based on the periodic correlation method that has utilized SCH or based on the cross-correlation method of the replica code that has utilized the sector own code come on axle detection time SCH regularly (the 1st step), with identification (the 2nd step) based on frame identification, sector ID and the sub-district ID regularly of the information on the frequency axis, Cell searching is finished.Therefore, compare, can shorten search and handle with existing 3 stage Cell searchings.Under this situation, only separate the timing needs owing to used the contrary expansion of pilot channel and coherent detection at data channel, and in Cell searching, do not need, so can realize alleviating the hardware burden of using based on the related operation of pilot channel (minimizing of memory span etc.).In addition, because the sector own code that on SCH, superposeed, so, also can obtain interference and the strong effect of decline ability between anti-sector for sector identification.But, under the inadequate situation of sub-carrier number, only can not carry out the Direct Recognition of sub-district ID by SCH, there is the situation in the detection that stops at sub-district ID group information, so in this case, as the processing of the 3rd step, implement to have used the contrary expansion and the coherent detection of pilot channel, discern sub-district ID.
In addition, multicarrier transmitter apparatus of the present invention comprises that the synchronizing channel (SCH) that will have structure of the present invention is distributed in the allocation units on the frequency axis in image duration; With the transmitting element with directivity antennas, described directivity antennas is sent in the multi-carrier signal that has distributed described synchronizing channel (SCH) on the frequency axis, and is arranged on each of a plurality of sectors.
Thus, can distribute the multi-carrier signal of sector intrinsic information and cell unique information from the antenna transmission of each sector at frequency axis.
In addition, multicarrier receiver of the present invention is to receive the described multi-carrier signal that sends from multicarrier transmitter apparatus of the present invention, and utilize the synchronizing channel (SCH) that contains in this received signal, multiply by the sector own code to discern the multicarrier receiver of sector, comprise: utilize the situation that on time shaft, has periodically disposed described synchronizing channel (SCH), detect the timing detecting unit of synchronizing channel (SCH) position in the received signal; With by based on multiply by of on frequency axis, disposing the contrary extension process of sector own code of described synchronizing channel (SCH), detect the sector recognition unit of the sector own code of the received power that provides maximum.
Thus, can receive multi-carrier signal, implement identification processing (sector search) based on the sector of SCH.
In addition, multicarrier receiver of the present invention is to receive the multi-carrier signal that sends from multicarrier transmitter apparatus, and utilize and contain in this received signal, adopted the synchronizing channel (SCH) of the symbol public to discern the multicarrier receiver of sector in the minizone, comprise: the timing detecting unit, the cross-correlation method of its time waveform of duplicating symbol by utilizing the described sector own code that multiplies each other with the subcarrier that has distributed in the symbol element that constitutes described sub-district own code as the described symbol element of described phase reference detects synchronizing channel (SCH) position in the received signal; With the sector recognition unit, it detects the sector own code of the received power that provides maximum by the contrary extension process based on the sector own code of the described synchronizing channel (SCH) that disposes on frequency axis.
In the multicarrier receiver of the present invention, in the 1st step of the position of the SCH that in detecting received signal, contains, adopt the time waveform of duplicating symbol with the sector own code to multiply by received signal and ask relevant method (cross-correlation method).Thus, timing that can high Precision Detection SCH.
In addition, multicarrier receiver of the present invention further has the cell identification unit, this cell identification unit is handled concurrently with the detection of the sector own code of being undertaken by described sector recognition unit, detection has distributed the subcarrier of the described phase reference of conduct in the subcarrier of described synchronizing channel (SCH), and this subcarrier is pairing to have multiply by phase difference between the subcarrier of symbol element of sub-district own code, come the described sub-district of demodulation own code, and further carry out as required handling with the coherent detection of the sub-district own code of wanting to detect, detected cells own code thus, thereby detected cells ID or sub-district ID group information.
Thus, can receive multi-carrier signal, and implement the Cell searching that comprises sector identification based on SCH.If sub-carrier number is abundant, then can only pass through SCH, carry out the identification of sector ID and sub-district ID.
In addition, multicarrier receiver of the present invention further has under the situation that by described cell identification unit information specific is sub-district ID group information, makes the unit of implementing to have utilized the contrary expansion of pilot channel and the cell identification process termination usefulness that coherent detection handles detected cells ID.
Thus, insufficient at sub-carrier number, only can discern by SCH under the situation of sub-district ID group, can discern sub-district ID and finish Cell searching then by the contrary expansion and the coherent detection of pilot channel.
In addition, in the data structure of synchronizing channel of the present invention (SCH), multiply by the described phase reference of conduct that constitutes described sub-district own code symbol element subcarrier (promptly, the subcarrier that is used for sector identification) be that benchmark is in low frequency side and high-frequency side symmetry with the centre frequency, and with a predetermined fixed subcarrier serves as to dispose at interval, thus, the time waveform that forms with the subcarrier coupling that is used for the identification of described sector with 1 symbol during in 1/M (M is the natural number more than 2) symbol be unit, the inversion waveforms of reference waveform or this reference waveform becomes the periodic time waveform with repetition, by utilizing the periodicity of this time waveform, can carry out the detection of synchronizing channel (SCH) position based on correlation method.
Further, by the configuration on frequency axis that is used for sector recognin carrier wave is worked hard, and can be unit with 1/N (N is the natural number more than 4) symbol, obtain the time waveform of feature, by utilizing property eigenperiod of this time waveform, can carry out high-precision correlated judgment more efficiently.Owing to be that the periodic simple correlation detection that is conceived to 1/N unit gets final product, so can simplify the structure of correlator (situation that also has matched filter).
In addition, for the data structure of synchronizing channel of the present invention (SCH), the subcarrier that in the identification of described sector, uses with centre frequency as benchmark in low frequency side and high-frequency side symmetry, and be under the 0th the situation in centre frequency, with the 2nd, the 6th, the 10th, the 14th ... like that, below similarly be configured on the position of 3 subcarriers of being separated by, thus, in the time waveform that forms with the subcarrier coupling that is used for the identification of described sector becomes during 1 symbol, with 1/4 symbol is unit, has the periodic time waveform of the inversion waveforms that alternately repeats reference waveform and this reference waveform.
If to establish reference waveform is B, then during 1 symbol in, obtaining with 1/4 symbol is unit, as B ,-B, B ,-mode the B, have the periodic time waveform of the inversion waveforms that alternately repeats reference waveform and this reference waveform.Under this situation, get final product owing to detect property specific cycle of the time waveform that repeats with 1/4 symbolic unit, so can simplify the structure of correlator.
In addition, for the data structure of synchronizing channel of the present invention (SCH), the subcarrier that in the identification of described sector, uses with centre frequency as benchmark in low frequency side and high-frequency side symmetry, and be under the 0th the situation in centre frequency, with the 4th, the 8th, the 12nd, the 16th ... like that, below similarly be configured on the position of 3 subcarriers of being separated by, thus, in the time waveform that forms with the subcarrier coupling that is used for the identification of described sector becomes during 1 symbol, with 1/4 symbol is unit, has the periodic time waveform of repetition reference waveform.
As to establish reference waveform be D, then during 1 symbol in, be unit with 1/4 symbol, with D, D, the such mode of D, D, obtain having the periodic time waveform that repeats identical reference waveform.Also can simplify the structure of correlator under this situation.
In addition, for the data structure of synchronizing channel of the present invention (SCH), the symbol element that constitutes the described phase reference of conduct of described sector common code and described sub-district own code is respectively a symbol public in all sub-districts, and the symbol element of described sector common code for the distribution on the frequency axis subcarrier of synchronizing channel (SCH) be public, and, the symbol element that constitutes the described phase reference of conduct of described sub-district own code is public to the subcarrier as phase reference on the frequency axis also, thus, when the sector own code that detects the received power that provides maximum by the contrary extension process based on described sector own code was discerned the sector, obtaining not needing to be defined as the subcarrier that the symbol element of the object of contrary expansion is used was the condition of adjacent one group of subcarrier.
Under the situation of the processing of carrying out the 1st step of Cell searching by cross-correlation (detection of SCH position is handled), make sector public in sector common code public in all sub-districts and all sub-districts with the symbol element that multiplies each other with subcarrier as phase reference is arranged in the sign indicating number, public between the subcarrier on the frequency axis (promptly all identical) then can adopt the simplest symbolic construction.Thus, can select any one subcarrier in total subcarrier to come the particular sector own code.Therefore, the subcarrier that does not need will obtain to use as the symbol element of the object of contrary expansion is defined as one group of adjacent condition that subcarrier is such.
In addition, small region search method of the present invention comprises the 1st step and the 2nd step, in the 1st step, by correlation method or cross-correlation method, detect the position of the synchronizing channel (SCH) in the received signal, in the 2nd step, the time waveform of utilizing the subcarrier coupling as phase reference with the symbol element that has distributed described sector own code to form becomes the situation of the symbol element characteristic of correspondence waveform that is distributed with this, detection is based on the correlation of cross-correlation method, with expression the sector of high correlation as nearest sector identification, the subcarrier that has distributed simultaneously the described phase reference of conduct in the subcarrier of described synchronizing channel (SCH) therewith concurrently by detection, with and the subcarrier of the corresponding symbol element that multiply by the sub-district own code of this subcarrier between phase difference, come the described sub-district of demodulation own code, and further carry out handling detected cells own code thus as required with the coherent detection of wanting the sub-district own code that detects.
In small region search method, can understand the contrary correlation peaks judgement of expanding after sector identification is not based on the FFT processing, and be undertaken by the cross-correlation of the time waveform before the FFT.That is, before FFT handles, use the doubling time waveform of sector own code to detect cross-correlation peak value, and the specific symbol that largest peaks is provided, thereby immediate sector can be discerned.In order to be suitable for the cross-correlation method used this doubling time waveform, with the known various sectors own code that sends from the base station of travelling carriage as condition.In addition,, use method also to be to use the method for detection, can consider that restriction on desired accuracy of detection and the circuit waits suitably to determine based on the cross-correlation of doubling time waveform based on the coherent detection of the contrary expansion of orthogonal code as sector identification method.

Claims (15)

1, a kind of sector identification method, when receiving from signal that the base station that the sub-district that comprises a plurality of sectors is administered sends, uses travelling carriage, this signal comprises the synchronizing channel that utilization generates with being used to discern the sector identification serial number corresponding sector own code of described sector, it is characterized in that
It is relevant to utilize described signal and described sector own code to ask for, thereby carries out sector identification.
2, sector identification method according to claim 1 is characterized in that,
It is relevant to utilize described signal and described sector own code to ask for, thereby carries out synchronous detecting.
3, sector identification method according to claim 1 is characterized in that,
Described sector own code is public between neighbor cell.
4, sector identification method according to claim 1 is characterized in that,
Described sector own code phase is orthogonality relation each other.
5, a kind of travelling carriage communicates with the base station that the sub-district that comprises a plurality of sectors is administered, it is characterized in that,
From described base station received signal, this signal comprises the synchronizing channel of having utilized with the corresponding sector of the sector identification serial number own code that is used to discern described sector.
6, travelling carriage according to claim 5 is characterized in that,
Carry out sector identification according to described synchronizing channel.
7, travelling carriage according to claim 6 is characterized in that,
It is relevant to utilize described signal and described sector own code to ask for, thereby carries out sector identification.
8, travelling carriage according to claim 6 is characterized in that,
Has synchronous channel signal handling part (200), by the described sector own code of correlation maximum being carried out the specific described sector identification of carrying out.
9, travelling carriage according to claim 5 is characterized in that,
Carry out synchronous detecting according to described synchronizing channel.
10, travelling carriage according to claim 9 is characterized in that,
It is relevant to utilize described signal and described sector own code to ask for, thereby carries out synchronous detecting.
11, travelling carriage according to claim 5 is characterized in that,
Described sector own code is public between neighbor cell.
12, travelling carriage according to claim 5 is characterized in that,
Described sector own code phase is orthogonality relation each other.
13, a kind of mobile communication system is characterized in that,
Constitute by base station and travelling carriage,
The administration of described base station comprises the sub-district of a plurality of sectors, sends to comprise the signal that has utilized with the corresponding sector of sector identification serial number synchronizing channel own code, each sector that is used to discern described sector,
Described travelling carriage receives described signal, carries out sector identification based on the described synchronizing channel that is included in the described signal.
14, mobile communication system according to claim 13 is characterized in that,
Described sector own code is public between neighbor cell.
15, mobile communication system according to claim 13 is characterized in that,
Described sector own code phase is orthogonality relation each other.
CNA2009101466262A 2006-06-16 2007-06-18 Mobile station, synchronization detection method, sector identification method and mobile communication system Pending CN101568167A (en)

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