CN101179819A - Sequence allocated method, system and device in multi-cell system - Google Patents

Sequence allocated method, system and device in multi-cell system Download PDF

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CN101179819A
CN101179819A CNA2006101733645A CN200610173364A CN101179819A CN 101179819 A CN101179819 A CN 101179819A CN A2006101733645 A CNA2006101733645 A CN A2006101733645A CN 200610173364 A CN200610173364 A CN 200610173364A CN 101179819 A CN101179819 A CN 101179819A
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sequence
different
running time
frequency resource
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曲秉玉
何玉娟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to KR1020097008639A priority patent/KR101074884B1/en
Priority to EP11004069.8A priority patent/EP2360851B1/en
Priority to EP19161785.1A priority patent/EP3585018A1/en
Priority to CN202010650098.0A priority patent/CN111884781B/en
Priority to CN201210516511.XA priority patent/CN102983957B/en
Priority to PL11004068T priority patent/PL2360850T3/en
Priority to EP07816965A priority patent/EP2068455B1/en
Priority to PCT/CN2007/070774 priority patent/WO2008049358A1/en
Priority to EP11004067.2A priority patent/EP2360849B1/en
Priority to AU2007308605A priority patent/AU2007308605B2/en
Priority to CN2010102306526A priority patent/CN101924598B/en
Priority to SI200730684T priority patent/SI2068455T1/en
Priority to AT07816965T priority patent/ATE510360T1/en
Priority to PT07816965T priority patent/PT2068455E/en
Priority to PT110040672T priority patent/PT2360849E/en
Priority to CN200780001879XA priority patent/CN101366193B/en
Priority to CN201710610142.3A priority patent/CN107395314B/en
Priority to JP2009529504A priority patent/JP4995914B2/en
Priority to EP11004068.0A priority patent/EP2360850B1/en
Priority to DK07816965.3T priority patent/DK2068455T3/en
Priority to PL07816965T priority patent/PL2068455T3/en
Publication of CN101179819A publication Critical patent/CN101179819A/en
Priority to US12/413,105 priority patent/US9294245B2/en
Priority to US12/982,655 priority patent/US7983237B2/en
Priority to CY20111100774T priority patent/CY1111761T1/en
Priority to JP2012108117A priority patent/JP5647177B2/en
Priority to JP2014225848A priority patent/JP6044034B2/en
Priority to US15/045,270 priority patent/US10305661B2/en
Priority to JP2016177523A priority patent/JP6548332B2/en
Priority to US16/419,008 priority patent/US10764011B2/en
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Abstract

The invention provides a sequence distribution method, system and devices in a multi-cell system. The method includes: different cells are distributed with different sequence groups by a network side, and the sequences in the sequence groups are determined according to a time-frequency resource way of bearing sequences which is supported by the system. The technical proposal in the invention leads to a good correlation of sequences between groups ,and to guarantee that the occupied time-frequency resources of the sequence modulation signals in different cells are not total identical, and to reduce interference between cells.

Description

The method, system and device of sequence allocation in the multi-cell system
Technical field
The present invention relates to the communications field, relate in particular to the method, system and device of sequence allocation in the multi-cell system.
Background technology
In recent years, in communication, normal amplitude zero autocorrelation performance (CAZAC, constant amplitudezero auto-correlate) sequence came into one's own gradually, and the characteristic of this sequence is specially:
The mould of ■ amplitude is a constant value, for example can be normalized to 1;
■ autocorrelation null cycle, except with self correlation maximum, other cyclic shift autocorrelation value of this sequence self is zero.
Because it has above-mentioned character, therefore through behind the Fourier transform, its sequence at frequency domain also is the CAZAC sequence, promptly also has normal amplitude and zero autocorrelation performance on frequency domain.
In the communication system, the signal of carrying CAZAC sequence is widely adopted usually.For example in single-carrier frequency division multiple access (SC-FDMA) system, in a symbol time, promptly the unit of CAZAC sequence is launched on a plurality of subcarriers according to the subcarrier number order, the signal of launching on each subcarrier is the unit of CAZAC sequence, if the known sequence that transmits, receiver just can utilize the signal that receives, and carries out the estimation of channel.Because the CAZAC sequence all is normal amplitude in time domain and frequency domain, therefore the waveform peak-to-average force ratio on time-domain is little, be easy to the transmitter emission.Simultaneously because the signal of emission amplitude on each subcarrier on the frequency domain equates that receiver can compare the fair channel fading that estimates on each subcarrier, can be not smaller because of signal amplitude on a subcarrier, and influence estimation performance.
Sequence with above-mentioned characteristic has a variety of generating modes, and comparatively general a kind of being called pricked doffer-first Zadoff-Chu sequence, and its generating mode is as follows:
a r ( n ) = W N n ( n + N mod 2 ) / 2 + qn , n = 0,1 , . . . , N - 1 ,
a rWhat (.) represented is the sequence that generates with r, and what n represented is n unit of sequence, and that N represents is the length of sequence, wherein W N=exp (± j2 π r/N), r is the number relatively prime with N, q is an integer arbitrarily.
In order to be easy to description and explanation hereinafter, formula (1) can be shown according to the odd even different table of N:
Figure A20061017336400061
In the following formula, when getting different r values, just obtain different sequences.For two different r values, for example r=u and r=v, when the absolute value of u-v and N were relatively prime, the their cross correlation of these two sequences was fine, that is to say that the correlation of all cyclic shifts of two sequences is all lower.When being a prime number for N itself especially, r=1,2 ..., N-1 generated N-1 different CAZAC sequence, and the cross correlation between these CAZAC sequences is fine.Shang Mian formula for example, when N was prime number, the absolute value of the cross-correlation of any two sequences of generation was
More generally also have GCL sequence (Generalized Chirplike Sequence), also can generate several groups of CAZAC sequences with good their cross correlation.
The GCL sequence is expressed as follows:
c(n)＝a(n)b(nmodm)，n＝0，1，...，N-1. (2)
N=sm wherein 2, s and m are positive integers, and { b (n) } is " modulation " sequence, and its a m element all is that mould is 1 plural number, as the DFT sequence, b i ( n ) = W m in , i , n = 0,1 , . . . , m - 1 . And { a (n) } in (2) is special " carrier wave " sequence, the Zadoff-Chu sequence of just above-mentioned (1) definition.
{ b (n) } can also be Hadamard (Hadarmard) sequence, promptly is the row of hadamard matrix.The hadamard matrix H on m rank m, be the matrix on m * m rank, the entry of a matrix element is formed by 1 and-1, satisfies H mH m T=mI.Wherein I is a unit matrix, the transposition of T representing matrix.For m=2 n, n is a positive integer, then Hadamard sequences is:
b i ( n ) = ( - 1 ) Σ l = 0 m - 1 i l - n l , i , k = 0,1 , . . . , m - 1 ,
Wherein, i l, n lBe i, the l position bit of the binary representation of the m bit long of n.
In communication, not only to consider the signal of this sub-district, also will consider the interference between signals of different districts emission.When a cell allocation after the emission of CAZAC sequence modulation, the another one sub-district will distribute use to have the another one CAZAC sequence of fine their cross correlation, for example working as N is prime number, and the r value that different cell allocation is different generates CAZAC sequence separately.
The modulation signal of sub-district emission also can adopt the fragment of CAZAC sequence, and perhaps circulation repeats, more generally say, and be exactly the various combinations of various fragments, also can keep the characteristic of CAZAC sequence.When particularly the number of the subcarrier of carrying CAZAC sequence is not a prime number just in the sub-district, perhaps each sub-district need utilize longer CAZAC sequence in the cellular system, when obtaining more different CAZAC sequence, can adopt the fragment of sequence or the mode of fragment combination to form the sequence that to launch.
When the signal of the CAZAC sequence of different sub-district emission takies identical running time-frequency resource, give different districts by determining different sequences, can make signal interference ratio each other less.As shown in Figure 1, the running time-frequency resource of different districts carrying sequence is overlapping, and each sub-district uses the sequence of equal length to launch.The CAZAC sequence of these two sub-districts or CAZAC sequence fragment, perhaps fragment combination can different CAZAC sequences obtain by two of equal length.For example length is two different CAZAC sequences of N, i.e. r=u, r=v, u and v are unequal, can be separately arbitrarily intercepted length be that the sequence of L is launched, wherein L is a constant smaller or equal to N.Because the fragment of two good sequences of cross correlation also has good cross correlation, so the interference ratio between the different districts is less.
When the signal of the CAZAC sequence of modulating takies different running time-frequency resources, have the situation of phase mutual interference.As shown in Figure 2, the part running time-frequency resource that different districts transmits is overlapping, and each sub-district uses the different sequence of length to launch.Transmitting of a sub-district takies the 1.25MHz bandwidth among Fig. 2, and the another one sub-district takies the signal of 5MHz bandwidth emission CAZAC modulation, and two-part running time-frequency resource is partly overlapping.If suppose to have in the 1.25MHZ bandwidth 37 sub-carriers carry CAZAC sequences, and have same sub-carrier at interval in the 5MHZ, but number is 150 subcarrier, the length of the CAZAC sequence that then obvious two sub-districts need be determined is different, and the fragment that the fragment of above-mentioned two long CAZAC sequences and short CAZAC sequence at this time will take place is the situation of mutual interference mutually.
Simultaneously, when distributing the sequence of a sub-district, peripheral cell may be the signal of the CAZAC sequence of 1.25MHz bandwidth, also may be the signal of 5MHz bandwidth, therefore the distribution of sequence can consider no matter peripheral cell is how wide signal, will guarantee that all cross correlation is little.No matter how many sub-districts are arranged on every side, the resource occupation mode of system's support is limited, can carry out rational sequence allocation and planning like this.
The signal of a sub-district modulation CAZAC sequence also may take a part of subcarrier in a certain bandwidth, for example only takies on the subcarrier of systematic sampling.Correlation with the peripheral cell signal also will need to consider in this case.As shown in Figure 3, reflection is exactly this situation.Fig. 3 is that the running time-frequency resource that different districts transmits is overlapped, and the sequence emission of equal length is used in each sub-district.A sub-district transmits and takies all interior subcarriers of 5MHz bandwidth among Fig. 3, and transmitting of another sub-district takies even subcarriers in the 10MHz bandwidth.
Certainly, above-mentioned Fig. 2 and two kinds of resource occupation modes shown in Figure 3 may occur in different constantly, just at a time the resource occupation mode of two sub-districts as shown in Figure 2, next constantly two sub-districts the resource occupation mode as shown in Figure 3.The occupancy mode of above-mentioned 3 kinds of resource transmitting sequences, each constantly all can have the situation of the fragment phase mutual interference of different CAZAC sequences, so will guarantee that the correlation between them is relatively good by assigned sequence.
The modulation signal of above-mentioned emission CAZAC sequence takies the situation of different running time-frequency resources, often takes place in the SC-FDMA system.When the terminal equipment in the system had the transmitted bandwidth that difference is scheduled, each terminal transmitted in the scheduling bandwidth of oneself, may take whole subcarriers emissions of scheduling bandwidth, also may take the subcarrier emission of systematic sampling.And the sequence of different districts takies the mode of running time-frequency resource, is not necessarily always identical all the time, so the problem of correlation of the fragment of different CAZAC sequences will occur.Thereby the sequence of each cell allocation must be will consider to obtain behind the various on every side possible disturbance regimes.
In the prior art, can require all cell allocation to give the running time-frequency resource of carrying CAZAC sequence always identical, promptly the running time-frequency resource of CAZAC sequence signal has been modulated in sub-district, necessarily overlapping fully with the running time-frequency resource of the CAZAC sequence signal of another one sub-district modulation, the different CAZAC sequence that so just can allocated length equates is distributed to different sub-districts.The operation that can certainly block, because take same running time-frequency resource, good correlation between the sequence has guaranteed the correlation that transmits.
But such scheme can only be supported the distribution of the resource of the CAZAC sequence of fixing, and the running time-frequency resource that the CAZAC sequence of all sub-districts takies all can only be identical at any time, concerning each sub-district, and can not efficent use of resources.
Summary of the invention
In view of this, the embodiment of the invention provides the method, system and device of sequence allocation in the multi-cell system, is used for running time-frequency resource that the signal of different districts sequence modulation takies not simultaneously, reduces the interference between each sub-district.
The embodiment of the invention provides the method for network side assigned sequence in a kind of multi-cell system, and this method comprises: network side is that different districts distributes different sequence set, and the sequence in the described sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports.
The embodiment of the invention also provides terminal in a kind of multi-cell system to determine and send the method for sequence, and this method comprises:
User terminal is according to the information of sub-district in the sub-district, determines that network side distributes to the sequence set of this sub-district;
This user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in the above-mentioned sequence set.
The embodiment of the invention also provides assigned sequence method in a kind of multi-cell system, and this method comprises:
Network side is that different districts distributes different sequence set, and the sequence in this sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports;
User terminal is according to the information of sub-district in the sub-district, determines that network side distributes to the sequence set of this sub-district;
This user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in this sequence set.
The embodiment of the invention also provides a kind of system of many cell allocation sequence, and this system comprises:
The sequence allocation unit is used to different districts to distribute different sequence set, and the sequence in the group is determined according to the running time-frequency resource mode of the carrying sequence that system supports;
The sequence of cells determining unit is used for according to the definite sequence set of using of cell information;
Running time-frequency resource sequence determining unit is used for according to the running time-frequency resource occupancy mode, determines the sequence that will generate in the above-mentioned sequence set;
Sequence generating unit is used to generate this sequence; With
Transmitter unit is used for this sequence is sent on corresponding running time-frequency resource.
The embodiment of the invention also provides a kind of cordless communication network side device, be used to carry out the sequence allocation of different districts, this device comprises the sequence allocation unit, be used to different districts to distribute different sequence set, determine sequence in the described sequence set according to the running time-frequency resource mode of the carrying sequence of system's support.
The embodiment of the invention also provides a kind of wireless communication terminal, is used for determining and send sequence that this terminal comprises:
The sequence of cells determining unit is used for according to the definite sequence set of using of cell information;
Running time-frequency resource sequence determining unit is used for according to the running time-frequency resource occupancy mode, determines the sequence that will generate in the above-mentioned sequence set;
Sequence generating unit is used to generate this sequence; With
Transmitter unit is used for this sequence is sent on corresponding running time-frequency resource.
The technical scheme that the embodiment of the invention provides, by network side is that different districts distributes different sequence set, sequence in the described sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports, make sequence between group have good correlation, when the running time-frequency resource that takies with the signal that guarantees the modulation of different sequence of cells was incomplete same, the interference ratio of minizone was less.
Description of drawings
Fig. 1 is that the different districts running time-frequency resource is overlapping in the prior art, uses the schematic diagram of equal length sequence;
Fig. 2 is that different districts part running time-frequency resource is overlapping in the prior art, uses the schematic diagram of the different sequence of length;
Fig. 3 is that different districts part running time-frequency resource is overlapping in the prior art, uses the schematic diagram of the sequence of equal length;
Fig. 4 is the schematic flow sheet of sequence allocating method in the multi-cell system of the present invention;
Fig. 5 is the schematic diagram of the correlation of short-and-medium sequence of the specific embodiment of the invention and long sequence fragment;
Fig. 6 is the schematic diagram of the correlation of the fragment of sequence in the specific embodiment of the invention and sequential sampling;
Fig. 7 is the structural representation of system of the present invention embodiment.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
As shown in Figure 4, be the schematic flow sheet of sequence allocating method embodiment in the multi-cell system, as seen from the figure, mainly comprise following content:
Network side:
Step 401, network side are that different districts distributes different sequence set, and the sequence in this sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports.
At the different running time-frequency resource that the sequence that will launch may take, the present invention program provides a plurality of sequences, guarantees that simultaneously these sequences have following characteristic:
When taking its corresponding running time-frequency resource, correlation each other is bigger.
These sequences that will meet above-mentioned characteristic are one group, according to the different group of mentioned above principle structure, guarantee the sequence between the different groups, and after taking its corresponding running time-frequency resource modulation, its correlation is smaller.
By such scheme, the equipment in the wireless communication system can generate so many group sequences, and according to the information of sub-district, carries out determining of sequence set.
For example,, generate the pseudo random sequence that the sub-district is specific, determine the sequence set of the emission that user in each launch time is used by this pseudo random sequence according to sub-district ID.The generation of this pseudo random sequence can be adopted the shift register generating mode, as m sequence commonly used or Gold sequence etc.The k of shift register state (a 1, a 2..., a k) corresponding the numbering of sequence set, the shift register revolution once, buffer status changes and produces new state, the corresponding next sequence set that adopts constantly.
These pseudo random sequences to the sub-district be different separately, the sub-district is specific, also can be that cell set is specific certainly under some condition.Such as three sectors under the Node B, they can use same pseudo random number to select sequence set, and the different time displacement by selected sequence obtains orthogonalized transmitting between the different sector.And the different pseudo random sequence of use between the different Node B.
End side:
Step 402, user terminal be according to cell information, determines that network side distributes to the sequence set of this sub-district, and the running time-frequency resource mode that takies by this user terminal carrying sequence is determined the sequence that will send in this sequence set.
After having determined group,, determine the sequence in the group, carry out sequence and generate according to the situation that user in the sub-district launches the running time-frequency resource that takies.
User terminal sends the sequence of above-mentioned generation in step 403, the sub-district.
In such scheme, network side generates different sequence set, distribute different one or more sequence set for different districts then, and the user terminal in each sub-district is according to the sign (ID) of this sub-district or distribute to the sign of the sequence set of this sub-district, occupancy mode according to separately running time-frequency resource, determine the sequence in the corresponding sequence set, carry out sequence then and generate and send.Above-mentioned network side generates different sequence set according to the correlation between each sequence, and the cross correlation value of the sequence in making on the same group can be not bigger, and the cross correlation value of the sequence between on the same group is not smaller.Thereby when different districts uses different sequence set, guarantee that the interference between the sub-district is less.
The sequence that is adopted in the specific embodiment of the invention scheme has the CAZAC characteristic, concrete for example Zadoff-Chu sequence and GCL sequence etc.
According to the generation expression formula of Zadoff-Chu sequence, the sequence of different length is controlled by parameter N, and the different sequences that generate equal length are controlled by parameter r, and the cyclic shift of the corresponding Zadoff-Chu of q also can be thought corresponding different sequence.
Below be the specific embodiment that different running time-frequency resources takies situation tectonic sequence group:
Specific embodiment one
Under environment shown in Figure 2, suppose in the 5MHz bandwidth, one has 150 available subcarriers, and system supports 5MHz to be divided into the CAZAC sequence transmitted bandwidth of 4 1.25MHz, perhaps has only two kinds of resource occupation modes of the transmitted bandwidth of a 5MHz, so at the 5MHz transmitted bandwidth, the length that takies the CAZAC sequence of all 150 subcarriers is to get prime number N=151, intercepts into 150, for taking the 1.25MHz transmitted bandwidth, subcarrier number 37 is just got prime number N=37.According to above-mentioned running time-frequency resource occupancy mode structure CAZAC sequence, for example can use the Zadoff-Chu sequence.Sequence according to same group of the resource occupation mode of system's support just has two, and corresponding respectively two kinds of situations that take 1.25MHz and 5MHz running time-frequency resource that is to say that two Zadoff-Chu sequences of same group are respectively:
37 long Zadoff-Chu sequence fragments are got r=k, k=1 wherein, and 2 ..., 36;
With 150 long Zadoff-Chu sequence fragments, the fragment of the Zadoff-Chu sequence of just former 151 length is got r=4*k, k=1,2 ..., 150, behind k＞38, r greater than 150, according to the generating mode of Zadoff-Chu, is equivalent to the calculating that r has carried out mould N during Practical Calculation.Long sequence can generate 150 sequences, but since short sequence can with r have only 36 sequences, so after two kinds of situations are got common factor, have only 36.Can certainly allow short sequence to reuse, at this moment just have 150 groups.
Two sequences of getting same k are one group, and different k constitutes different CAZAC sequence set.
In addition, these 2 the CAZAC sequences in same group, if in the frequency domain carrying, can also on the time domain waveform that obtains through discrete inverse-Fourier transform, generate different CAZAC sequences by cyclic shift, distribute as required.
Above-mentioned cyclic shift is about to one section front that copies to this array, back of former array, for example, if former CAZAC sequence transformation shape on the time domain is grown into the time domain waveform { a of s 0, a 1, a 2..., a S-1, after the cyclic shift, just become { a P+1, a P+2..., a S-1..., a 0, a 1..., a p, wherein p can be 0,1 ..., the integer between the s-1.
The sequence that the cyclic shift of a sequence produces when distributing to different sub-districts, can be thought a plurality of sequences, thus the also corresponding different sequence set of different displacements.
The transmitted bandwidth of 4 1.25MHz, the amount of bandwidth that takies is identical, but the position of frequency resource block and different, therefore, also can think 4 kinds of different running time-frequency resource occupancy modes, corresponding different respectively CAZAC sequences just has 5 sequences in such CAZAC sequence set.The formation of these 5 sequences can be carried out according to following rule:
r i=a iK+b i, r i=a iK+b i, a wherein i, i=1,2,3,4 corresponding 4 1.25M bandwidth, i distinguishes different running time-frequency resources.4 1.25M bandwidth can be selected a respectively 1=1, a 2=2, a 3=3, a 4=5, can select a to the 5MHz bandwidth 5=4, and all b iAll equal zero, i.e. b 1=0, b 2=0, b 3=0, b 4=0, b 5=0
When 4 sequences that adopt in the transmitted bandwidth of 4 1.25MHz are identical, then become the situation that a CAZAC sequence set has 2 sequences.
Specific embodiment two
Under environment shown in Figure 3, system supports the bandwidth of two kinds of resource occupation mode: 10MHz to be divided into two 5MHz bandwidth, the running time-frequency resource that the CAZAC sequence signal takies in the 5MHz bandwidth is that running time-frequency resource that the signal of the CAZAC sequence of whole 150 subcarriers and 10MHz bandwidth takies is 150 or 151 subcarriers that obtain every an extraction in 301 subcarriers.This moment, same group of interior CAZAC sequence was example with Zadoff-Chu, was exactly:
Get N=151, r=k is cut into 150, generates the Zadoff-Chu sequence of 5MHz bandwidth correspondence;
Get N=151, r=4k is cut into 150, generates the Zadoff-Chu sequence of 10MHz bandwidth correspondence.
Top k value can be from 1～150.
Therefore, have two CAZAC sequences in one group, certainly, also can generate more sequence by cyclic shift by these two CAZAC sequences again, cyclic shift can be regarded a class as, has only different k, just the different group of correspondence.
Same group CAZAC sequence when generating with the Zadoff-Chu sequence, is selected r=a*k, and a is a factor at different time-frequency resource allocating modes, is an integer.The CAZAC sequence of identical k is one group, and the CAZAC sequence of different k is different group.The selection of a need be satisfied r i · g i 2 r j · g j 2 = b j b i , G wherein i, g jRepresent in two kinds of resource occupation modes, on frequency separately every g iAnd g jIndividual subcarrier extracts a subcarrier, b j/ b iThe ratio of representing actual occupied bandwidth under two kinds of resource occupation modes can be specially the ratio of subcarrier number of carrying sequence usually.That is to say square being inversely proportional to of the numbering of sequence of two kinds of resource correspondences and sampling interval g.
General, according to the theory of the CAZAC sequence of knowing, one is long is the CAZAC sequence a of M i, i=0 ..., M-1, if the sampling interval is s, and M and s are coprime, then a (si) modM, i=0,1 ..., M-1 is a CAZAC sequence.So these two sequences can be distinguished two interior sequences of a group in the sampling interval of corresponding different running time-frequency resources.Top Zadoff-Chu sequence is one of them example.
Specific embodiment three
Because the resource occupation mode that each sub-district at a time all may exist in the known system, so selection requirement according to above-mentioned a, carry out sequence selection as long as satisfy each sub-district basis running time-frequency resource separately, need not distinguish peripheral cell is any resource occupation mode on earth, can guarantee that the interference ratio between peripheral cell is less.For example, current system support resource occupation mode at a time has three kinds, is respectively that the sequence shown in Fig. 2 and Fig. 3 is launched the subcarrier that takies the 1.25MHz bandwidth, subcarrier and the sequence emission that the sequence emission takies the 5M bandwidth takies in the 10M bandwidth every a subcarrier of taking out one.Therefore when giving each cell allocation sequence set:
The mode that takies the subcarrier of 1.25MHz bandwidth is got N=37, can get r=k, and wherein possible k is 36 to the maximum; This mode and other two kinds of resource modes relatively satisfy r i · g i 2 r j · g j 2 = b j b i The choosing of a the time, will obtain: r=4k need be got in the sub-district that takies the subcarrier mode of 5M bandwidth, and k wherein is 150 to the maximum; With take in the 10M bandwidth every one take out one subcarrier mode relatively, just need r=16k, k wherein is 150 to the maximum.
The resource occupation mode is used according to distributing to it in each sub-district, carries out determining of sequence in the sequence set k that is distributed.Need the interference of consideration under every kind of resource mode, for example, suppose that the sequence relation of each sub-district acquiescence is
Figure A20061017336400152
The sequence set of distributing as sub-district A is k=2, and the sequence emission takies the subcarrier of 5M bandwidth, and it can only be generated the sequence of r=8 by N=151, launches after in addition necessary the blocking; Emission takies the subcarrier of 1.25M bandwidth as infructescence, is then launched by the sequence of N=37 generation r=2; Take in the 10M bandwidth every a subcarrier of taking out one as infructescence emission, then generate in the sequence of r=32 and launch by N=151.Identical sequence generating mode is also adopted in other sub-district, the sequence set k difference of each cell allocation only, and resource occupation mode separately also may not be identical, so two local resource occupancy mode differences may occur, but r is identical, uses same sequence, but because the resource difference, and satisfied above-mentioned requirements, both made and on overlapping resource, also do not had very strong interference.
Under the various resource occupation modes that system supports, the sequence relation of each sub-district acquiescence also can be other the relation of requirement of other the satisfied a of choosing, for example
Figure A20061017336400161
By simulating, verifying, the sequence in the different sequence set of the present invention design, correlation is little when taking corresponding running time-frequency resource, and the correlation between the sequence in same group is bigger.Therefore, concerning the planning of cellular system, different sub-districts is as long as the group difference of the sequence of determining just can guarantee to turn down mutually, disturb little.Concerning same sub-district, can determine one group or organize sequence more, sequence number is as required determined.
When multiple resource occupation mode, more than two sequences are just arranged in each sequence set, 2 sub-district resource occupation mode situations as shown in Figure 2 at a time for example, next occupancy mode constantly is as shown in Figure 3 situation etc. then.
Fig. 5 has verified the correlation between two groups of k=1 and k=2.Wherein (N, r) expression length is r sequence in the N sequence.Can see that N is 37 sequence, its auto-correlation (except 37 correlation was arranged in zero displacement place, other displacement place correlation all was 0) and cross-correlation are all fine, and (correlation in any displacement place all is
Figure A20061017336400162
).And being a part of fragment in 37 the sequence and N, N is the correlation of a part of fragment in 151 the sequence, relevant with the r value of definite sequence.Can see when k=1, N is that 37 the 1st sequence and N are that 151 the 4th sequence just has higher cross correlation value, maximum reaches about 28, because being actually, they belong to same group sequence, and with N be that the cross correlation value of 151 the 2nd sequence is just lower, greatly about about 11, because this sequence is actually the sequence that belongs in the k=2 group.Good relationship between the sequence during this has just illustrated not on the same group.
Same, Fig. 6 has verified the correlation between two groups of k=1 and k=2.Wherein (N, r) expression length is r sequence in the N sequence.Can see that N is 151 sequence, its auto-correlation (except 151 correlation was arranged in zero displacement place, other displacement place correlation all was 0) and cross-correlation are all fine, and (correlation in any displacement place all is
Figure A20061017336400163
).And the correlation of N to be length in 151 the sequence be 75 fragment and the fragment of the back combination of sampling is relevant with the r value of definite sequence.Can see that N is that 151 the 1st sequence and N are that 151 the 4th sequence just has higher cross correlation value, can about 50 correlation peak occur two displacements place, and with N be that the cross correlation value of 151 the 2nd sequence is just lower, all be lower than in all displacements place
Figure A20061017336400164
, the good relationship between the sequence during this has just illustrated not on the same group.
Specific embodiment four
The existence that transmits of multiple different bandwidth is arranged in system, and the interior employed sequence of different bandwidth of sequence set can be constructed by following rule.The method of this structure is as follows:
Two CAZAC sequences are respectively the long a of M that is 0, a 1..., a M-1With growing is the b of N 0, b 1..., b N-1, then utilize long two the CAZAC sequences long of M, the long CAZAC sequence c of structure MN with N i=a ImodMB ImodN, i=0,1 ..., MN-1.Work as M, when N is coprime, constructs the sequence that obtains in this way and still satisfy the CAZAC characteristic.Sequence b iCorresponding is the mode that takies N subcarrier running time-frequency resource, sequence c iCorresponding is the mode that takies M*N subcarrier running time-frequency resource.Sequence b i, c iBelong to same group.Application such as Fig. 2 that it is concrete show.The sequence length that the 1.25MHz bandwidth of a sub-district is used is 37 Zadoff-Chu sequence b i, and another sub-district use is by 37 long sequence b iWith 4 long Zadoff-Chu sequence a iThe sequence (, also having some necessary sequence truncation or fillings) of 148 length of structure in order to mate the subcarrier number.If same b is used in two sub-districts iCorresponding sequence, during the sequence in group, then correlation is big in other words.If different b is used in two sub-districts iWhen corresponding sequence, the sequence of perhaps different groups, correlation is little.
Can prove for the Zadoff-Chu sequence that especially if M, N is coprime, two long is the Zadoff-Chu sequence of M and N, and the sequence that obtains by above-mentioned operation is the Zadoff-Chu sequence of MN for length.Prove as follows:
a m = exp [ 2 π r 1 j · ( m ( m + M mod 2 ) / 2 ) M ]
b n = exp [ 2 π r 2 j · ( n ( n + M mod 2 ) / 2 ) N ]
c i = a i mod M · b i mod N = exp [ 2 πj · { r 1 m ( m + M mod 2 ) / 2 + r 2 n ( n + N mod 2 ) / 2 } MN ]
= exp [ 2 πj · { Nr 1 i ( i + M mod 2 ) / 2 + Mr 2 i ( i + N mod 2 ) / 2 } MN ]
= exp [ 2 πj · { Nr 1 i ( i + M mod 2 ) / 2 + Mr 2 i ( i + N mod 2 ) / 2 } MN ]
= exp [ 2 πj · { ( Nr 1 + Mr 2 ) i ( i + MN mod 2 ) / 2 } MN ]
Following formula is at M, set up when N is odd number, when one be one of even number when being odd number, differ under the situation of a cyclic shift and also set up.Because r 1Coprime with M, r 2Coprime with N, so Nr 1+ Mr 2Coprime with MN, so this sequence is the Zadoff-Chu sequence.
General, be the Zadoff-Chu sequence of M to length, and M = Π i p i k i , p iIt is different prime factors.Then this sequence is to be p by length i k iSeveral Zadoff-Chu sequences multiply each other and obtain.Long sequence c is if the product of short sequence a and the short sequence b of another one obtains, then will grow sequence c and b two sequences as corresponding different running time-frequency resources in a group, can certainly be with long sequence c and a two sequences as corresponding different running time-frequency resources in a group.
Above-mentioned four embodiment take the whole bag of tricks of situation tectonic sequence group to different running time-frequency resources.After having constructed sequence set, distribute one or more different sequence set according to cell ID.Usually can distribute by the mode that randomization distributes.For example, according to cell ID, generate the pseudo random sequence that the sub-district is specific, promptly the pseudo random sequence of each sub-district is different, is determined the sequence set of the emission that user in each launch time is used by this pseudo random sequence.The generation of this pseudo random sequence can be adopted the shift register generating mode, and as two element field or m sequence among the polynary territory GF (q) or Gold sequence etc. commonly used, the initial condition of different registers, the sequence of perhaps different displacements are adopted in different sub-districts.The k of shift register state (a 1, a 2..., a k) corresponding the numbering of sequence set, the shift register revolution once, buffer status changes and produces new state, the corresponding next sequence set that adopts constantly.
These pseudo random sequences to the sub-district be different separately, the sub-district is specific, also can be that cell set is specific certainly under some condition.Such as three sectors under the Node B, as a group, they can use same pseudo random number to select sequence set, and the different time displacement by selected sequence obtains orthogonalized transmitting between the different sector.Different groups is to use different pseudo random sequences between the different NodeB.
According to the building method of the sequence set of introducing above and the distribution method of sequence set, illustrate below:
System to a 5MHz bandwidth, its frequency band is divided into 25 elementary cells uniformly, and the scheduling bandwidth of pilot signal can be 1 elementary cell, 2 elementary cells, ..., 25 elementary cells are so the combination of corresponding these baseband unit is present among the system with regard to the sequence that 25 kinds of length are arranged.If use l 1, l 2..., l 25Represent these sequences length separately, and each length l iUnder sequence number N iRepresent, so different length l iUnder sequence can be numbered r I, 1, r I, 2..., r I, NiLike this, just comprise 25 sequences in the sequence set, be expressed as { r I, kmodNi| i=1,2 ..., 25}, k are exactly the numbering of sequence set.Carry out the distribution of sequence set if utilize sub-district particular random method, be exactly that information such as numbering, user ID according to the time slot at current pilot place produce the numbering k that current random number is come corresponding sequence set so, the frequency bandwidth that takies according to pilot tone determines the length of the sequence of use then, again with { r I, kmodNi| i=1,2 ..., the numbering of the sequence under this length that 25} obtains choosing is carried out sequence then and is generated or read and launch.
In the above-mentioned method, constructed sequence set is the occupancy mode according to the different pilot resources that exist in the system, and carry out with some rules.This application of rules is in all sub-districts, can be called a burst mode that the sub-district is public, but the use of sequence is the selection of carrying out sequence set by sub-district particular random number, saltus step takes place in this sub-district particular random number on different pilot time slots, so some short sequences can be not always occurred simultaneously with the some long sequence of adjacent sub-district.Interference is more for a long time from one like this, has avoided always disturbing between two sub-districts stronger situation to occur.
Above-mentioned method embodiment can realize that this system comprises by communication system shown in Figure 7:
Sequence allocation unit 701 is used to different districts to distribute different sequence set, determines sequence in the described sequence set according to the running time-frequency resource mode of the carrying sequence of system's support.
Sequence of cells determining unit 702 is used for determining spendable sequence set according to cell information.
Running time-frequency resource sequence determining unit 703 is used for according to the running time-frequency resource occupancy mode, determines the sequence that will generate in the sequence set of determining from sequence of cells determining unit 702.
Sequence generating unit 704 is used to generate the sequence of being determined by running time-frequency resource sequence determining unit 703.
Transmitter unit 705 is used for the sequence that sequence generating unit 704 generates is sent on corresponding running time-frequency resource.
Comprise a kind of cordless communication network side device and a kind of wireless communication terminal in the said system, wherein,
Comprise sequence allocation unit 701 in the cordless communication network side device, be used to different districts to distribute different sequence set, determine sequence in the described sequence set according to the running time-frequency resource mode of the carrying sequence of system's support.
Wireless communication terminal is used for determining and send sequence that this device comprises: sequence of cells determining unit 702, running time-frequency resource sequence determining unit 703, sequence generating unit 704 and transmitter unit 705.
Protection scope of the present invention is as the criterion with the protection range of claims, and the various changes and the modification that do not break away from spirit and scope of the invention that those skilled in the art carries out the present invention are all within the protection range of claim of the present invention.

Claims (16)

1. the method for network side assigned sequence in the multi-cell system is characterized in that,
Network side is that different districts distributes different sequence set, and the sequence in the described sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports.
2. the method for claim 1 is characterized in that,
Network side is that different districts distributes different sequence set in pseudorandom mode.
3. the method for claim 1 is characterized in that,
The sequence set that network side distributes the described sub-district of current time with the specific pseudo random sequence in sub-district.
4. method as claimed in claim 3 is characterized in that, the specific pseudo random sequence in described sub-district is the specific pseudo random sequence of cell set.
5. the method for claim 1 is characterized in that, the running time-frequency resource mode of the carrying sequence of described system support comprises: the mode that different bandwidth, different frequency sub-carrier extract at interval or the position of different time.
6. the method for claim 1 is characterized in that, the sequence in the described sequence set is normal amplitude zero an autocorrelation performance CAZAC sequence, or makes up the sequence that generates by the CAZAC sequence fragment.
7. the method for claim 1 is characterized in that, the sequence in the described sequence set generates by pricking doffer-first Zadoff-Chu sequence, meets following generation formula:
a r ( n ) = W N n ( n + N mod 2 ) / 2 + qn , n＝0，1，...，N-1
a rThe sequence that (.) expression generates with r, n represents n unit of sequence, N represents the length of sequence, wherein W N=exp (± j2 π r/N), r is the number relatively prime with N, q is an integer arbitrarily.
8. the method for sequence is determined and sent to terminal in the multi-cell system, it is characterized in that described method comprises:
User terminal is according to the information of sub-district in the sub-district, determines that network side distributes to the sequence set of this sub-district;
Described user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in the described sequence set.
9. method as claimed in claim 8 is characterized in that, the running time-frequency resource mode of described carrying sequence comprises: the mode that different bandwidth, different frequency sub-carrier extract at interval or the position of different time.
10. method as claimed in claim 9 is characterized in that, the mode that described user terminal extracts at interval according to different frequency sub-carrier is determined the sequence that will send in the described sequence set, in the following way:
The running time-frequency resource that takies when user terminal carrying sequence be to another running time-frequency resource be spaced apart that the sampling of s obtains the time, then its corresponding sequence is to the pairing sequence a of another running time-frequency resource i, i=0 ..., M-1 is spaced apart the sequence a that the sampling of s obtains (si) modM, i=0,1 ..., M-1;
When the described sampling interval, s was inequality, square being inversely proportional to of the numbering of the sequence that described sampling obtains and sampling interval.
11. method is characterized in that as claimed in claim 8 or 9, described user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in the described sequence set, in the following way:
When user terminal carrying sequence took different running time-frequency resources, the numbering of corresponding length sequence satisfied: r i=a iK+b i, the group that identical k is corresponding identical, a i, b iDifferent running time-frequency resources by CU determine that i distinguishes different running time-frequency resources.
12. method is characterized in that as claimed in claim 8 or 9, described user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in the described sequence set, in the following way:
When user terminal carrying sequence takies two different running time-frequency resources, the corresponding relation of length sequence satisfies: long sequence c is if the product of short sequence a and the short sequence b of another one obtains, and then will grow sequence c and lack two sequences in the sequence set that sequence b is corresponding different running time-frequency resources.
13. assigned sequence method in the multi-cell system is characterized in that,
Network side is that different districts distributes different sequence set, and the sequence in the described sequence set is determined according to the running time-frequency resource mode of the carrying sequence that system supports;
User terminal is according to the information of sub-district in the sub-district, determines that network side distributes to the sequence set of this sub-district;
Described user terminal is according to the running time-frequency resource mode that takies of carrying sequence, determines the sequence that will send in the described sequence set.
14. the system of cell allocation sequence is characterized in that more than one kind, described system comprises:
The sequence allocation unit is used to different districts to distribute different sequence set, determines sequence in the described sequence set according to the running time-frequency resource mode of the carrying sequence of system's support;
The sequence of cells determining unit is used for according to the definite sequence set of using of cell information;
Running time-frequency resource sequence determining unit is used for according to the running time-frequency resource occupancy mode, determines the sequence that will generate in the described sequence set;
Sequence generating unit is used to generate described sequence; With
Transmitter unit is used for described sequence is sent on corresponding running time-frequency resource.
15. cordless communication network side device, be used to carry out the sequence allocation of different districts, it is characterized in that, described device comprises the sequence allocation unit, be used to different districts to distribute different sequence set, determine sequence in the described sequence set according to the running time-frequency resource mode of the carrying sequence of system's support.
16. a wireless communication terminal is used for determining and sending sequence, it is characterized in that described terminal comprises:
The sequence of cells determining unit is used for according to the definite sequence set of using of cell information;
Running time-frequency resource sequence determining unit is used for according to the running time-frequency resource occupancy mode, determines the sequence that will generate in the described sequence set;
Sequence generating unit is used to generate described sequence; With
Transmitter unit is used for described sequence is sent on corresponding running time-frequency resource.
CNA2006101733645A 2006-09-30 2006-12-30 Sequence allocated method, system and device in multi-cell system Pending CN101179819A (en)

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CNA2006101733645A CN101179819A (en) 2006-09-30 2006-12-30 Sequence allocated method, system and device in multi-cell system
PT110040672T PT2360849E (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
JP2009529504A JP4995914B2 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
EP19161785.1A EP3585018A1 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
CN201710610142.3A CN107395314B (en) 2006-09-30 2007-09-25 Sequence generation method, signal transmission and reception method and device in communication system
CN201210516511.XA CN102983957B (en) 2006-09-30 2007-09-25 Sequence allocating method, series processing method and device in communication system
PL11004068T PL2360850T3 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
EP07816965A EP2068455B1 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
EP11004069.8A EP2360851B1 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
EP11004067.2A EP2360849B1 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
AU2007308605A AU2007308605B2 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
CN2010102306526A CN101924598B (en) 2006-09-30 2007-09-25 Sequence distribution method, sequence processing method and device in communication system
SI200730684T SI2068455T1 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
AT07816965T ATE510360T1 (en) 2006-09-30 2007-09-25 SEQUENCE DISTRIBUTION METHOD, SEQUENCE PROCESSING METHOD AND APPARATUS IN A COMMUNICATIONS SYSTEM
EP11004068.0A EP2360850B1 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distribution and processing in a communication system
KR1020097008639A KR101074884B1 (en) 2006-09-30 2007-09-25 Method and apparatus for sequence distributing and sequence processing in communication system
CN200780001879XA CN101366193B (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
CN202010650098.0A CN111884781B (en) 2006-09-30 2007-09-25 Sequence allocation method, sequence processing method and device in communication system
PCT/CN2007/070774 WO2008049358A1 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
PT07816965T PT2068455E (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
DK07816965.3T DK2068455T3 (en) 2006-09-30 2007-09-25 Sequence distribution method, sequence processing method and apparatus in communication system
PL07816965T PL2068455T3 (en) 2006-09-30 2007-09-25 Sequence distributing method, sequence processing method and apparatus in communication system
US12/413,105 US9294245B2 (en) 2006-09-30 2009-03-27 Method and apparatus for sequence distributing and sequence processing in communication system
US12/982,655 US7983237B2 (en) 2006-09-30 2010-12-30 Method and apparatus for sequence distributing and sequence processing in communication system
CY20111100774T CY1111761T1 (en) 2006-09-30 2011-08-10 Sequence Distribution Method, Sequence Processing Method, and Communications Device
JP2012108117A JP5647177B2 (en) 2006-09-30 2012-05-10 Method and apparatus for sequence distribution and processing in a communication system
JP2014225848A JP6044034B2 (en) 2006-09-30 2014-11-06 Method and apparatus for sequence distribution and processing in a communication system
US15/045,270 US10305661B2 (en) 2006-09-30 2016-02-17 Method and apparatus for sequence distributing and sequence processing in communication system
JP2016177523A JP6548332B2 (en) 2006-09-30 2016-09-12 Method and apparatus for sequence distribution and processing in a communication system
US16/419,008 US10764011B2 (en) 2006-09-30 2019-05-22 Method and apparatus for sequence distributing and sequence processing in communication system
US17/006,790 US11811697B2 (en) 2006-09-30 2020-08-29 Method and apparatus for sequence distributing and sequence processing in communication system
US18/186,446 US20230299927A1 (en) 2006-09-30 2023-03-20 Method and apparatus for sequence distributing and sequence processing in communication system

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