CN101115269A - Method, device and application for identifying cell identifier ID number - Google Patents
Method, device and application for identifying cell identifier ID number Download PDFInfo
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- CN101115269A CN101115269A CNA200610088894XA CN200610088894A CN101115269A CN 101115269 A CN101115269 A CN 101115269A CN A200610088894X A CNA200610088894X A CN A200610088894XA CN 200610088894 A CN200610088894 A CN 200610088894A CN 101115269 A CN101115269 A CN 101115269A
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Abstract
The invention discloses a method to distinguish an ID numbers of a subdistrict. First, the ID group number of the subdistrict is distinguished by a synchronizing channel and the ID group number is corresponding to a plurality of ID numbers of one group; and then among the ID group numbers of the subdistrict, the ID number of the subdistrict group is distinguished by a pilot frequency marks; at last, the ID number of the subdistrict can be known according to the ID group number and the ID number inside the group. The invention also discloses a subdistrict beginning search method, wherein, first the course synchronizing is processed and then the ID group number of the subdistrict is distinguished by the synchronizing channel; then, according to the ID group number and the pilot frequency marks, the ID number of the subdistrict is made sure; at last, the broadcasting information of the subdistrict is read. The technic proposal greatly reduces the number of the original sequence which takes part in the related calculation, and thus improving the searching efficiency.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method, device and application of discerning cell identifier ID number.
Background technology
The frame structure form of existing TD-SCDMA system as shown in Figure 1.Each wireless sub-frame is by 7 common time slots (TS0～TS6) constitute with three special time slots.Wherein, common time slot is used for transmitting data; three special time slots are respectively DwPTS (downlink pilot frequency channel; be used for the transmission of the down-going synchronous information of system); UpPTS (ascending pilot channel; be used for the uplink synchronous information transmission that the user inserts), GP (the translation and protection time slot is used to provide the time interval of descending sending time slots to up sending time slots conversion).
In order to make mobile communication technology in the longer time, keep certain technology competition advantage, carried out the Long Term Evolution plan (LTE) of 3GPP at present in the world.In a kind of TDD evolution standard of this plan is worked out, in order to take into account the demand with existing TD-SCDMA coexistence of systems, adopted essentially identical with it frame structure, as shown in Figure 1, but on the multi-access mode that physical layer adopted, abandoned the existing C dma mode, and adopted OFDM (OFDM) mode and corresponding multiple access technology.
In this TDD evolution system,, in the DwPTS special time slot, there is 1 OFDM symbol to be used for the estimation of down-going synchronous and frequency deviation as descending synchronous signal channel SCH according to system requirements.Placed two row frequency pilot signs in two row OFDM symbols of TS0 time slot, described sequence of pilot symbols is used to carry one or more pilot frequency informations, and wherein comparatively main information is cell ID (ID) number.Particularly, base station system adopts certain mode to generate a former arrangement set of id number, whole id numbers of a sub-district have all been carried in the former sequence of in this set each, adopting random fashion then is former sequence of id number of each cell allocation, and places it in the pilot frequency symbol position of downlink frame structure TS0 time slot.
Accordingly, user equipment (UE) can be known the former arrangement set of above-mentioned id number, and for example UE adopts the mode identical with the base station to generate above-mentioned former arrangement set, perhaps in advance the former arrangement set of base station generation is stored among the UE or the like.In addition, UE knows also what the sub-district id number that each former sequence is carried in the set specifically is.For example each sub-district id number is 10 item sign indicating numbers of binary representation, and the former arrangement set of base station system generation may comprise 2 so
10=1024 former sequences, corresponding, each UE also knows 1024 former sequences and each the former sequence corresponding district id number in this former arrangement set.
When UE carries out cell initial search after start, determine the original position of received signal subframe by the OFDM symbol of synchronizing channel after, can find the sequence of pilot symbols in the TS0 time slot, the ID of this sequence of pilot symbols respective cell number.The front is mentioned, UE predicts the former sequence of id number (being former arrangement set) and each former sequence corresponding district id number of all sub-districts, in the former arrangement set of id number, must there be one and district pilots symbol sebolic addressing corresponding, though sequence of pilot symbols can be owing to channel effect has certain decline, variation in downlink transmission process, still with former arrangement set in the corresponding former sequence of that id number have the correlation of maximum.
Therefore, UE takes turns doing related operation with 1024 former sequences in described sequence of pilot symbols and the described former arrangement set, finds that the former sequence that has maximum correlation with it.Because UE knows each former sequence corresponding district id number, therefore above-mentioned id number with former sequence correspondence of maximum correlation is the sub-district id number, so UE can obtain the sub-district id number in the cell initial search process.
This shows that obtain the method for sub-district id number according to above-mentioned UE in the cell initial search process, UE must carry out related operation one by one with the whole former sequence in sequence of pilot symbols and the former arrangement set of id number, could discern the sub-district id number.But, number of cells is very many, and then the former arrangement set that carries whole sub-districts id number is also corresponding very huge, so it is complicated and very long sequence of pilot symbols and whole former sequence to be carried out successively the process of related operation, cause the efficient of UE identification sub-district id number lower thus, further also reduced the whole efficiency of cell initial search process.
Summary of the invention
The object of the present invention is to provide a kind of method of discerning the sub-district id number, in the method that solves existing identification sub-district id number, owing to need to participate in the huge low technical problem of search efficiency that causes of former sequence number of related operation.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions: a kind of method of discerning cell identifier ID number, may further comprise the steps: receive synchronous channel signal, by synchronizing channel identification sub-district ID group number, described ID group number is corresponding in a plurality of groups ID number; Receive common pilot symbols, in the ID group number scope of described sub-district, by in the described frequency pilot sign identification cell set ID number; Know the sub-district id number interior ID number according to above-mentioned sub-district ID group number and group.
The detailed process of described identification sub-district ID group number comprises: search has the former sequence of maximum correlation with the synchronous channel signal that receives in the former arrangement set of ID group number; With the ID group number of described former sequence correspondence with maximum correlation as sub-district ID group number.
ID number detailed process comprises in the described identification cell set: search has the former sequence of maximum correlation with the frequency pilot sign that receives in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district; With in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.
Described synchronizing channel is positioned at downlink pilot frequency channel DwPTS time slot, and described common pilot symbols is positioned at the time slot to sub-district omnidirectional transmitting system broadcast message.
A kind of device of discerning the sub-district id number comprises ID group number search unit, is used for by synchronizing channel identification sub-district ID group number, and described ID group number is corresponding in a plurality of groups ID number; ID search unit in the group is used in the sub-district ID group number scope that described ID group number search unit provides by in the frequency pilot sign identification cell set ID number; ID number synthetic sub-district id number in the ID search unit provides in the sub-district ID group number that provides according to ID group number search unit and the group the cell set is provided the number synthesis unit.
Described ID group number search unit specifically comprises: the former sequence units of ID group number is used to provide the former arrangement set that carries different I D group number; ID group number related operation unit is used for having the former sequence of maximum correlation in the former sequence units search of ID group number with synchronization channel sequence, and the ID group number of this former sequence correspondence is a sub-district ID group number.
The ID search unit specifically comprises in described group: ID number former sequence units in the group is used to provide ID number former arrangement set in a plurality of groups corresponding to different I D group number; ID related operation unit in the group is used in the group corresponding with sub-district ID group number ID number former arrangement set search and has the former sequence of maximum correlation with sequence of pilot symbols, and ID number be interior ID number of cell set in the group of this former sequence correspondence.
A kind of initial cell search method may further comprise the steps: synchronously thick; Receive synchronous channel signal, by synchronizing channel identification sub-district ID group number; Receive common pilot symbols, determine the sub-district id number jointly according to described sub-district ID group number and frequency pilot sign; Read the broadcast message of sub-district.
Describedly determine jointly that according to sub-district ID group number and frequency pilot sign the process of sub-district id number comprises: in the ID group number scope of described sub-district, by in the frequency pilot sign identification cell set ID number; Know the sub-district id number interior ID number according to above-mentioned sub-district ID group number and group.
The detailed process of described identification sub-district ID group number comprises: search has the former sequence of maximum correlation with synchronous channel signal in the former arrangement set of ID group number; With the ID group number of described former sequence correspondence with maximum correlation ID group number as the sub-district;
ID number detailed process comprises in the described identification cell set: search has the former sequence of maximum correlation with frequency pilot sign in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district; With in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.
Above technical scheme in the present invention at first by synchronous channel signal identification sub-district ID group number, then in the ID group number scope of described sub-district, by in the frequency pilot sign identification cell set ID number, and then is known the sub-district id number as can be seen at last.Because in the search cell group, in ID number the process, need carry out just one group of interior ID number former sequence of group of related operation, rather than ID number former sequence in all organizing, the therefore feasible former sequence number that participates in related operation significantly reduces, thereby has improved search efficiency.
Description of drawings
Fig. 1 is the frame structure schematic diagram of existing TD-SCDMA system;
Fig. 2 is a kind of synchronizing channel organigram that is applicable to technical solution of the present invention;
Fig. 3 is a kind of TS0 time-multiplexed pilot symbol construction schematic diagram that is applicable to technical solution of the present invention;
Fig. 4 is the schematic diagram that concerns of former arrangement set of ID group number and the interior ID number former arrangement set of group;
Fig. 5 is a kind of embodiment flow chart of discerning the sub-district id number disclosed by the invention;
Fig. 6 is the schematic flow sheet of a kind of initial cell search method disclosed by the invention;
Fig. 7 is a kind of device example structure schematic diagram of discerning the sub-district id number disclosed by the invention.
Embodiment
Core concept of the present invention is: obtain the sub-district id number by two-step method, at first obtain the ID group number of sub-district by synchronizing channel, obtain in the group of sub-district ID number by frequency pilot sign then, and then determine the sub-district id number jointly.
Because it is relevant that the UE side is carried out the structural scheme of concrete mode in the cell initial search process and frame structure, therefore introduce a kind of frame structure scheme that is applicable to technical solution of the present invention earlier, wherein related to the present invention mainly is synchronizing channel and frequency pilot sign.More concrete in order to narrate, with broad band time division duplex honey comb system as the exemplary application environment, but described environment should not be construed as the restriction to technical solution of the present invention, for example the present invention is not limited only to the TDD pattern, also be applicable to the FDD pattern, all be suitable for technical solution of the present invention based on the various wireless systems of OFDM modulation system.
With reference to the TD-SCDMA frame structure among Fig. 1, when the tcp data segment employing OFDM of TS0～TS6 mode, the Design of Signal of then corresponding descending pilot frequency special time slot DwPTS part can adopt the aspect of single carrier, perhaps adopts the OFDM working method of a plurality of arrowbands parallel transmission.According to the frame structure characteristics of TD-SCDMA, for make the TD-SCDMA evolution system can and existing TD-SCDMA (1.6MHz) system between realize that adjacent colocation site frequently disposes, do not cause interference each other, the slot length of DwPTS is restricted.
Particularly, the center of TD-SCDMA evolution system GP time slot must with the aliging of existing TD-SCDMA system, could guarantee so can not cause and adjacently disturb frequently.Simultaneously, the sub-district maximum coverage range of the length of GP time slot and system design interrelates, and must guarantee certain length, thereby make that the DwPTS slot length is restricted.Under the time span condition of limited of descending pilot frequency special time slot, in order to be used for the descending synchronous signal channel of OFDM, an OFDM symbol can be set in this special time slot, the structural scheme of concrete descending synchronous signal channel SCH is as shown in Figure 2.
Synchronous channel SCH is made of an OFDM symbol, and the bandwidth of SCH is provided with according to system requirements, is 1.25MHz or other bandwidth.The OFDM symbol of structure SCH channel is formed a S set, and the OFDM symbol has nothing in common with each other in the set.In the TDD system, the SCH channel that the OFDM symbol is constructed this sub-district is always chosen in each sub-district from S set, adopts different OFDM symbols between neighbor cell.Simultaneously, each OFDM symbol correspondence a sub-district ID group number, and this group number has been represented a group sub-district ID number.
When the OFDM sign map in the S set is on the subcarrier in frequency domain of correspondence, form a frequency domain sequence set, correspondingly, wherein each frequency domain sequence carries a sub-district ID group number.For the frequency domain sequence set that S set forms, to be used when not only base station side is carried out the synchronizing channel structure, the UE side also can be used, and in other words, this frequency domain sequence set is that base station side and UE side are known information altogether, is former arrangement set.Convenient for following narration, the frequency domain sequence set that S set is formed is called the former arrangement set of ID group number.
Have good their cross correlation between the former in twos sequence in the former arrangement set of described ID group number, simultaneously, each former sequence also has good autocorrelation performance.Need explanation, well cross correlation is meant when carrying out related operation between the different former sequences, can obtain less correlation; And well autocorrelation is meant when identical former sequence is carried out related operation, can obtain bigger correlation.
From frequency domain, the SCH synchronizing channel OFDM symbol sebolic addressing of this sub-district of the former sequence structure of ID group number is always chosen in each sub-district from the former arrangement set of ID group number, and simultaneously, each synchronizing channel OFDM symbol sebolic addressing carries a sub-district ID group number.Sub-district ID group number is the part of a sub-district id number, and normally the former position of sub-district id number has 10 as certain sub-district id number, preceding 4 ID group numbers that are called as this sub-district, in back 6 groups that are called as this sub-district ID number.
By as can be known aforementioned, a former sequence is chosen from the former arrangement set of ID group number in each sub-district, constructs the OFMD symbol sebolic addressing of this sub-district synchronizing channel, and carries sub-district ID group number therein.As in the group of sub-district ID number, then carried in the sequence of pilot symbols in the TS0 time slot.
See also Fig. 3, it is the pilot design schematic diagram of TS0 time slot.In the TS0 time slot, placed two row frequency pilot sign R1 and R2 in two row OFDM symbols, frequency pilot sign can be continuous placement on one section frequency domain, also can place a frequency pilot sign by at interval several subcarriers.The sequence of pilot symbols of TS0 has taken two OFDM symbols, the density of sequence of pilot symbols on the frequency-domain OFDM subcarrier can be set as required, for example can a frequency pilot sign be set according to per two subcarriers, perhaps three subcarriers are provided with a frequency pilot sign, also can a frequency pilot sign all be set each subcarrier.If place frequency pilot sign on the introns carrier wave, other subcarriers of same OFDM symbol can be placed data also can not let alone for what data, specifically stipulates according to system.
Owing to sub-district ID group number is former positions of sub-district id number, the ID group number that therefore has a plurality of sub-districts is identical, and they distinguish part each other and are a few item sign indicating numbers in back, and promptly group is interior ID number.In other words, same ID group number can be corresponding in a plurality of groups ID number, and carry in sequence of pilot symbols in the group of this sub-district ID number each sub-district.
In order to achieve the above object, on the former arrangement set of ID group number basis, construct a plurality of groups of interior ID number former arrangement sets.See also Fig. 4, it is the schematic diagram that concerns of former arrangement set of ID group number and the interior ID number former arrangement set of group.Comprise the former sequence of a plurality of ID group numbers in the former arrangement set of ID group number, the former sequence of each ID group number is carried a sub-district ID group number; The former sequence of each ID group number is corresponding to ID number former arrangement set in the group, and each the former sequence in described group in ID number former arrangement set carries in the cell set ID number.
In other words, ID number former arrangement set comprises what sub-district ID group numbers (being the former sequence of ID group number) corresponding to a sub-district ID group number in each group in the former arrangement set of ID group number, ID number former arrangement set in just corresponding what groups of existence.The OFDM symbol sebolic addressing of this sub-district synchronizing channel of the former sequence structure of ID group number is at first chosen in the sub-district from the former arrangement set of ID group number, and then, in that group of the former sequence correspondence of this ID group number, choose ID number former sequence in the group ID number former arrangement set, construct the part of this district pilots symbol sebolic addressing.Certainly, the information that sequence of pilot symbols carries may be not only in the group of this sub-district ID number, also has other to be used for the information (this part information is not that the present invention is concerned about) of pilot tone.
In order to be illustrated more clearly in the relation of ID number former arrangement set in former arrangement set of above-mentioned ID group number and the group, provide a concrete example below.The id number of supposing each sub-district is made of ten bits, and then can have 2 to greatest extent
10=1024 kinds of sub-district id numbers, with preceding 46 be as sub-district ID group number with the back as ID in the cell set number, promptly sub-district id number=sub-district ID group number+cell set is interior ID number.
The former arrangement set of ID group number was introduced in the front when describing the structure of synchronizing channel, the former sequence of ID group number in this set has nothing in common with each other, and the former sequence of each ID group number is carried a sub-district ID group number, and the former sequence of each ID group number is corresponding to a sub-district ID group number in other words.For the sub-district ID group number that 4 bits constitute, always have 2
4=16 kinds of assembled schemes, so, comprising 16 former sequences of ID group number in the former arrangement set of ID group number, the former sequence of each ID group number is corresponding to a sub-district ID group number.6 hytes of each ID group number back, 4 sub-districts have 2 interior ID number
6=64 kinds of assembled schemes, promptly each ID group number at most can be corresponding in 64 kinds of groups ID number, so the former arrangement set correspondence of ID group number ID number former arrangement set in 16 groups, and ID number former arrangement set comprises ID number former sequence in 64 groups in each group.From in essence, exactly 1024 sub-district id numbers are divided into 16 groups, every group corresponding to 64.
No matter being ID number former arrangement set in the former arrangement set of ID group number or each group, all is the information of knowing jointly for base station side and UE side.When certain cell base station during descending sub frame, jointly carries this sub-district id number by the frequency pilot sign in synchronizing channel OFDM symbol and the TS0 time slot in transmission.
A kind of frame structure scheme that is applicable to technical solution of the present invention is more than disclosed, and the former arrangement set known jointly of base station and UE side.Below on this basis, introduce a kind of method embodiment that discerns the sub-district id number disclosed by the invention in detail from UE side angle degree.
See also Fig. 5, it is a kind of embodiment flow chart of discerning the sub-district id number disclosed by the invention.
Step 510: receive synchronous channel signal, search has the former sequence of maximum correlation with synchronizing channel OFDM symbol sebolic addressing in the former arrangement set of ID group number.
Step 520: as sub-district ID group number, described ID group number is corresponding in a plurality of groups ID number with the ID group number of described former sequence correspondence with maximum correlation.
UE can carry out the location of synchronizing channel to receiving sequence by the thick method such as synchronous of time domain, and then finds synchronizing channel OFDM symbol sebolic addressing.The front was carried, described synchronizing channel OFDM symbol sebolic addressing is selected from the former arrangement set of ID group number, in this synchronizing channel OFDM symbol sebolic addressing, carrying sub-district ID group number (because the former sequence of each ID group number in the ID group number arrangement set is all being carried a sub-district ID group number), but UE can not directly read sub-district ID group number from the synchronizing channel OFDM symbol sebolic addressing that receives specifically be what.
The front was carried, UE can know the content of the former arrangement set of ID group number, and know wherein what the former sequence corresponding district of each ID group number ID group number specifically is, so as long as the synchronizing channel OFDM symbol sebolic addressing of knowing its reception can achieve the goal corresponding in the former arrangement set of described ID group number which.Owing to have good cross correlation between each the former sequence in the former arrangement set of ID group number, and the former sequence of each ID group number has reasonable autocorrelation again, therefore, can be in the known former arrangement set of ID group number of UE, the synchronizing channel OFDM symbol sebolic addressing of searching for and receiving has the former sequence of ID group number of maximum correlation.Particularly, the synchronizing channel OFDM symbol sebolic addressing of reception and each the former sequence in the former arrangement set of ID group number are carried out related operation successively, by relatively finding the former sequence of that ID group number of maximum related value correspondence, this former sequence corresponding district ID group number is exactly this sub-district ID group number.
Step 530: receive common pilot symbols, search has the former sequence of maximum correlation with sequence of pilot symbols in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district.
Step 540: with in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.
Discerned sub-district ID group number by step 510 and 520, so need further to discern this cell set interior ID number.UE is in the thick position of finding synchronizing channel after synchronously, and then according to the timing relationship between known TS0 time-multiplexed pilot symbol and the synchronizing channel OFDM symbol, also can find the position of frequency pilot sign in the TS0 time slot, and then from receiving sequence, obtain sequence of pilot symbols.Before chat and carried, the sequence of pilot symbols of each sub-district partly is selected from the interior ID number former arrangement set of group, in described sequence of pilot symbols, carrying in the cell set ID number (because ID number former sequence all carried in the cell set ID number in each group), but UE can't directly read from the sequence of pilot symbols that receives in the cell set ID number equally.
The former sequence of each ID group number is corresponding to ID number former arrangement set in the group, and promptly each sub-district ID group number is corresponding in the group ID number, and UE knows above-mentioned information.So,, just can learn what cell set specifically is interior ID number as long as UE can know that its sequence of pilot symbols that receives adopts is ID number former sequence in which group.After step 520 had obtained sub-district ID group number, UE can find ID number former arrangement set in that corresponding in this ID group number scope group.Then, each former sequence in ID number former arrangement set in the sequence of pilot symbols that receives and this group is carried out related operation successively, by ID number former sequence in that group that relatively finds the maximum related value correspondence, the group of this former sequence correspondence is cell set interior ID number interior ID number.
Step 550: know the sub-district id number interior ID number according to above-mentioned sub-district ID group number and group.
Aforementioned carrying, therefore interior ID number of sub-district id number=sub-district ID group number+cell set, is obtaining sub-district ID group numbers by step 510 and 520, and obtains can know the sub-district id number on the interior ID basis of cell set by step 530 and 540.
Make a general survey of the foregoing description as can be known, UE is divided into two and goes on foot identification sub-district id number, and then the former arrangement set that relates to that carries out related calculation is two: ID number former arrangement set in former arrangement set of ID group number and the group.Suppose that each sub-district number is 10 bit binary number, according to technical solution of the present invention (suppose that preceding 4 are the ID group number, back 6 is interior ID number of group), Searching I D group number step need carry out 2
4The ID step need carry out 2 in=16 correlations computings, search groups
6=64 correlations computings, UE needs to carry out the computing of 16+64=80 correlations altogether can discern the sub-district id number; And adopt the existing method (as described in the background art) of discerning the sub-district id number, then need to carry out 2
10=1024 correlations computings.This shows, adopt the former sequence number that technical scheme provided by the invention can significantly reduce needs to participate in related operation, and then it is low to improve search efficiency.
Need explanation, though present embodiment is to be described under the situation of the described frame structure scheme of hypothesis descending sub frame employing preamble,, the described frame structure scheme of preamble should not be construed as the restriction to the present invention program.Because essence of the present invention is to discern in two steps the sub-district id number, specifically how to construct as for synchronizing channel in the downlink frame structure and frequency pilot sign, be not the essence that the present invention is concerned about, the pilot frequency symbol position that for example carries in the cell set ID number not only is confined in the TS0 time slot, and the structure of synchronizing channel also not only is confined to OFDM (OFDM) mode etc.Based on this, a kind of method of discerning the sub-district id number disclosed by the invention may be summarized to be following step: by synchronizing channel identification sub-district ID group number, described ID group number is corresponding in a plurality of groups ID number; In the ID group number scope of described sub-district, by in the frequency pilot sign identification cell set ID number; Know the sub-district id number interior ID number according to above-mentioned sub-district ID group number and group.
Utilize above-mentioned two to go on foot the method for discerning the sub-district id number, the invention also discloses a kind of method of cell initial search.See also Fig. 6, it is a kind of initial cell search method schematic flow sheet disclosed by the invention.
Step 610: time domain is slightly synchronous.This step is the first step of cell initial search process, user equipment (UE) mainly be utilize synchronizing channel (SCH) OFDM symbol carry out temporal thick synchronously.Preamble was introduced, sub-district for broad band time division duplex honey comb system, the SCH channel of different districts sends the OFDM symbol sebolic addressing by choosing the former sequence difference of the ID group number that neighbor cell is chosen, i.e. the OFDM symbol difference of neighbor cell in the former arrangement set of ID group number.
Thick synchronous concrete grammar for example, is repeated to constitute if the waveform of OFDM symbol on time domain is two identical waveforms by the waveform decision of OFDM symbol in the SCH channel on time domain, then can adopt methods such as difference is relevant to carry out thick time synchronized.By synchronously thick, UE and base station can keep synchronously substantially, and synchronism deviation diminishes, and can find the position of synchronizing channel, and then knows synchronizing channel OFDM symbol from receiving sequence.
Step 620: receive synchronous channel signal, by synchronizing channel OFDM Symbol recognition sub-district ID group number.On the basis of step 610, SCH channel OFDM symbol is carried out conventional thick frequency offset correction, to reduce the frequency departure between UE and base station.After having finished thick frequency offset correction, the OFDM symbol time-domain signal that receives is passed through the IDFT conversion, be converted into frequency domain sequence, promptly obtain synchronizing channel OFDM symbol sebolic addressing.The synchronizing channel OFDM symbol sebolic addressing that obtains is carried out related operation with different former row in the former arrangement set of ID group number, choose the transmission symbol of the sequence of correlation maximum as this OFDM, the former sequence corresponding district of this ID group number ID group number is sub-district ID group number.Because preamble embodiment had done in detail the related content of this step and had introduced, thereby repeated no more herein.
Step 630: receive common pilot symbols, determine the sub-district id number jointly according to described sub-district ID group number and frequency pilot sign.At first in the ID group number scope of described sub-district, by in the frequency pilot sign identification cell set ID number; Know the sub-district id number interior ID number according to sub-district ID group number and group then.Particularly, search has the former sequence of maximum correlation with sequence of pilot symbols in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district; With in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.Because preamble embodiment had done in detail the related content of this step and had introduced, thereby repeated no more herein.
Step 640: the broadcast message that reads the sub-district.Deadline synchronously, frequency offset correction and obtain the sub-district id number after, the broadcast message that UE can reading system.UE is before the id number of identification sub-district, though can receive the broadcast message of sub-district, but can't know the information that is used to resolve broadcasted content such as cell scrambling etc., and then can't from broadcast message, really read required content, only identify after the id number of sub-district, just can know the specifying informations such as scrambler that adopt this sub-district.UE is by reading the broadcast message of this sub-district, and the acquisition system sends system's basic configuration informations such as bandwidth, and then finishes the cell initial search process.
The invention also discloses a kind of device of discerning the sub-district id number, see also Fig. 7, it is the device example structure schematic diagram of described identification sub-district id number.Described device comprises ID search unit 72 and number synthesis unit 73 in ID group number search unit 71, the group.Wherein, ID group number search unit 71 specifically comprises former sequence units 711 of ID group number and ID group number related operation unit 712; ID search unit 72 specifically comprises ID related operation unit 722 in interior ID number former sequence units 721 of group and the group in the group.Below in conjunction with the operation principle of this device, be described in further detail its content structure.Need explanation, because preamble carried out introducing in detail to some notions that the present invention relates to, for example ID number former arrangement set and the relation between them in the former arrangement set of ID group number, the group, contents such as synchronizing channel OFMD symbol sebolic addressing and sequence of pilot symbols, therefore no longer repeat in the present embodiment to introduce, please described referring to preamble.
At first, after UE obtains synchronizing channel OFMD symbol, use ID group number search unit 71 by synchronizing channel identification sub-district ID group number, described ID group number is corresponding in a plurality of groups ID number.Particularly, the former sequence units 711 of ID group number is used to provide the former arrangement set that carries different I D group number, the former sequence units 711 of described ID group number can adopt with the base station same way as and generate the former arrangement set of ID group number, also can store the former arrangement set of ID group number that is generated by base station side.ID group number related operation unit 712 uses synchronizing channel OFDM symbol to carry out relevant search in the former sequence units of ID group number, each sequence that is about in synchronizing channel OFDM symbol sebolic addressing and the former arrangement set of ID group number carries out related calculation, by relatively finding the former sequence of that ID group number that has maximum correlation with synchronizing channel OFDM symbol sebolic addressing, the ID group number of this former sequence correspondence is sub-district ID group number.
Then, ID search unit 72 in the group is informed with the sub-district ID group number that draws in ID group number related operation unit 712.ID search unit 72 comprises ID related operation unit 722 in interior ID number former sequence units 721 of group and the group in the group.Wherein, ID number former sequence units 721 is used to provide ID number former arrangement set in corresponding to different I D group number a plurality of groups in the group, and each former sequence that ID number former arrangement set comprises in each group is carried in the different groups ID number.In other words, ID number former sequence units 721 is to concern one to one with the former sequence units 711 of ID group number in the group, the former sequence of each ID group number in the former sequence units 711 of ID group number is all corresponding to ID number former arrangement set in the group in ID number former sequence units 721 in the group, promptly in each group ID number former arrangement set all corresponding an ID group number.
In the sub-district ID group number that draws is informed group in ID group number related operation unit 712 behind the ID related operation unit 722, ID related operation unit 722 is just in organizing in ID number former sequence units 721, carry out relevant search in ID number former arrangement set in the group of sub-district ID group number correspondence in the group, i.e. search has interior ID number former sequence of group of maximum correlation with sequence of pilot symbols, and then the group of this former sequence correspondence is exactly interior ID number of cell set interior ID number.
At last, by number synthesis unit 73, ID number synthetic sub-district id number in the cell set that ID search unit 72 provides in sub-district ID group number that ID group number search unit 71 is provided and the group.
More than a kind of method, device and application of discerning the sub-district id number provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a method of discerning cell identifier ID number is characterized in that, may further comprise the steps:
Receive synchronous channel signal, by described synchronizing channel identification sub-district ID group number, described ID group number is corresponding in a plurality of groups ID number;
Receive common pilot symbols, in the ID group number scope of above-mentioned sub-district, discern in the cell set ID number by described frequency pilot sign;
Know the sub-district id number interior ID number according to described sub-district ID group number and group.
2. the method for identification as claimed in claim 1 sub-district id number is characterized in that, the detailed process of described identification sub-district ID group number comprises:
Search has the former sequence of maximum correlation with the synchronous channel signal that receives in the former arrangement set of ID group number;
With the ID group number of described former sequence correspondence with maximum correlation as sub-district ID group number.
3. the method for identification as claimed in claim 1 sub-district id number is characterized in that, ID number detailed process comprises in the described identification cell set:
Search has the former sequence of maximum correlation with the frequency pilot sign that receives in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district;
With in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.
4. as the method for any described identification sub-district id number in the claim 1 to 3, it is characterized in that described synchronizing channel is positioned at downlink pilot frequency channel DwPTS time slot, described common pilot symbols is positioned at the time slot to sub-district omnidirectional transmitting system broadcast message.
5. device of discerning the sub-district id number is characterized in that comprising:
ID group number search unit is used for by synchronizing channel identification sub-district ID group number, and described ID group number is corresponding in a plurality of groups ID number;
ID search unit in the group is used in the sub-district ID group number scope that described ID group number search unit provides by in the frequency pilot sign identification cell set ID number;
ID number synthetic sub-district id number in the ID search unit provides in the sub-district ID group number that provides according to ID group number search unit and the group the cell set is provided the number synthesis unit.
6. the device of identification as claimed in claim 5 sub-district id number is characterized in that, described ID group number search unit specifically comprises:
The former sequence units of ID group number is used to provide the former arrangement set that carries different I D group number;
ID group number related operation unit is used for having the former sequence of maximum correlation in the former sequence units search of ID group number with synchronization channel sequence, and the ID group number of this former sequence correspondence is a sub-district ID group number.
7. as the device of claim 5 or 6 described identification sub-district id numbers, it is characterized in that described group of interior ID search unit specifically comprises:
ID number former sequence units in the group is used to provide ID number former arrangement set in a plurality of groups corresponding to different I D group number;
ID related operation unit in the group is used in the group corresponding with sub-district ID group number ID number former arrangement set search and has the former sequence of maximum correlation with sequence of pilot symbols, and ID number be interior ID number of cell set in the group of this former sequence correspondence.
8. an initial cell search method is characterized in that, may further comprise the steps:
Synchronously thick;
Receive synchronous channel signal, by synchronizing channel identification sub-district I D group number;
Receive common pilot symbols, determine the sub-district id number jointly according to described sub-district ID group number and frequency pilot sign;
Read the broadcast message of sub-district.
9. initial cell search method as claimed in claim 8 is characterized in that, described process according to sub-district ID group number and the definite jointly sub-district of frequency pilot sign id number comprises:
In the ID group number scope of described sub-district, by in the frequency pilot sign identification cell set ID number;
Know the sub-district id number interior ID number according to above-mentioned sub-district ID group number and group.
10. initial cell search method as claimed in claim 9 is characterized in that,
The detailed process of described identification sub-district ID group number comprises: search has the former sequence of maximum correlation with synchronous channel signal in the former arrangement set of ID group number; With the ID group number of described former sequence correspondence with maximum correlation ID group number as the sub-district;
ID number detailed process comprises in the described identification cell set: search has the former sequence of maximum correlation with frequency pilot sign in ID number former arrangement set in group, and described group of interior ID number former arrangement set is under the jurisdiction of in the ID group number scope of sub-district; With in the group of described former sequence correspondence with maximum correlation ID number as ID in the cell set number.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009146582A1 (en) * | 2008-06-02 | 2009-12-10 | Huawei Technologies Co., Ltd. | Method in a wireless communication system |
| CN101227232B (en) * | 2008-02-01 | 2010-06-09 | 中兴通讯股份有限公司 | Method and apparatus for mapping of downlink pilot frequency initial position |
| CN102026168A (en) * | 2010-12-29 | 2011-04-20 | 大唐移动通信设备有限公司 | Method and equipment for distributing physical cell ID |
| CN101801064B (en) * | 2009-02-10 | 2013-06-26 | 电信科学技术研究院 | Method, device and system for recognizing cell and/or cell carrier |
| CN106851783A (en) * | 2017-03-14 | 2017-06-13 | 北京邮电大学 | Cell based on NB IoT systems finds method and device |
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| CN100539466C (en) * | 2004-11-15 | 2009-09-09 | 凯明信息科技股份有限公司 | The serial iteration method of rapid and second step of initial cell search first step in the tdd systems |
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| CN101227232B (en) * | 2008-02-01 | 2010-06-09 | 中兴通讯股份有限公司 | Method and apparatus for mapping of downlink pilot frequency initial position |
| WO2009146582A1 (en) * | 2008-06-02 | 2009-12-10 | Huawei Technologies Co., Ltd. | Method in a wireless communication system |
| CN102067718A (en) * | 2008-06-02 | 2011-05-18 | 华为技术有限公司 | Method in a wireless communication system |
| CN102067718B (en) * | 2008-06-02 | 2013-06-26 | 华为技术有限公司 | Method in a wireless communication system |
| CN101801064B (en) * | 2009-02-10 | 2013-06-26 | 电信科学技术研究院 | Method, device and system for recognizing cell and/or cell carrier |
| CN102026168A (en) * | 2010-12-29 | 2011-04-20 | 大唐移动通信设备有限公司 | Method and equipment for distributing physical cell ID |
| CN102026168B (en) * | 2010-12-29 | 2013-06-12 | 大唐移动通信设备有限公司 | Method and equipment for distributing physical cell ID |
| CN106851783A (en) * | 2017-03-14 | 2017-06-13 | 北京邮电大学 | Cell based on NB IoT systems finds method and device |
| CN110959298A (en) * | 2017-07-24 | 2020-04-03 | 华为技术有限公司 | Wireless device operating according to pilot time slots associated with a group of base stations |
| CN110959298B (en) * | 2017-07-24 | 2021-10-01 | 华为技术有限公司 | Wireless device operating according to pilot time slots associated with a group of base stations |
| US11165616B2 (en) | 2017-07-24 | 2021-11-02 | Huawei Technologies Co., Ltd. | Cell search of user equipment in accordance with cell search slots associated with groups of base stations |
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