CN101925191B - Method, device and mobile communication system for determining zero correlation zone (ZCZ) length set - Google Patents

Abstract

The invention provides a method for determining a zero correlation zone (ZCZ) length set, which comprises the following steps: determining the length of a root sequence; and selecting a ZCZ length set which is characterized in that for any cell radius, the maximum leading quantity determined by one ZCZ length selected from the selected ZCZ length set is most approximate to the maximum leading quantity determined by any one ZCZ length selected from a set of all integers, wherein the maximum leading quantity is determined by the length of the root sequence and the selected ZCZ length. The invention also provides a device, a base station and a mobile communication system for determining the ZCZ length set. In the invention, the selected finite set of the ZCZ lengths needs to meet certain conditions, and a technical scheme for selecting a better finite set of the ZCZ lengths is provided, thereby reducing the cost of signaling.

Description

Determine method, device and the mobile communication system of length set of zero-correlation zone

Technical field

The present invention relates to mobile communication technology, relate in particular to method, device and the mobile communication system of definite length set of zero-correlation zone of random access guiding technology.

Background technology

In mobile communication system, generally by portable terminal to the base station send random access guiding (RandomAccess Preamble) with the initialization of carrying out joining procedure at random and realization and base station synchronously.

In in March, 2007 disclosed " 3GPP TS 36.211 v1.0.0-Physical Channels andModulation (physical channel and modulation) ", determined each sub-district have 64 leading.When portable terminal carried out joining procedure initialization at random, it is leading that portable terminal need send 64 in leading one.In addition, portable terminal by select one specific leading, a message can be sent to the base station.

Before transmission was leading, portable terminal must at first be finished with the carrier frequency (carrierfrequency) and the frame timing (frame timing) of base station synchronous, promptly finishes down-going synchronous.Even but portable terminal has been finished down-going synchronous, when a signal that sends from portable terminal arrives the base station, still can there be uncertainty, this be because, a portable terminal far away from the base station is compared with a portable terminal nearer from the base station, have a bigger time delay when receiving downstream signal, and can spend more time to be sent to the base station with respect to the upward signal that sends from the portable terminal nearer from the base station from the upward signal that the portable terminal far away from the base station sends.If caused just not finishing uplink synchronous before uplink signal transmissions, will there be interference in this uncertainty on the winding time (round trip time) between the upward signal that different terminals sends.

Transmission by any random access guiding can make the base station might estimate the time of advent of upward signal.The base station can be based on the estimation of this time of advent, sends a time to order in advance to portable terminal to guarantee uplink synchronous.So, in case portable terminal sent one leading, which the base station just can detect and leadingly be sent out and estimate its time of advent.

In order to obtain leading quite good detecting characteristic, in other words, in order to estimate the time of advent of upward signal accurately, leading set should be designed to have good auto-correlation and their cross correlation.

In the UTRA of evolution (E-UTRA, Evolved UTRA), the random access guiding set is defined by one or several root sequence (root sequence).Leading subclass x _{U, v}(k) be Zadoff-Chu (ZC) sequence x by u rank root _u(k) by a plurality of cyclic shift increment N _CSCyclic shift generate, concrete, x _{U, v}(k) can generate by following formula:

x _u，v(k)＝x _u，v((k+vN _CS)mod?N _ZC)， (1)

Wherein, v is an integer, N _ZCBe the length of ZC sequence, the ZC sequence is defined as follows:

x _u(k)＝W ^uk(k+1)/2，k＝0，1，...，N _ZC-1， $W=e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009102058449E00021.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}/N_{\mathrm{ZC}}},$ $j=\sqrt{-1}---\left(2\right)$

Leading number can be generated by a single sequence, for

Wherein,

Expression is not more than the maximum integer of n.If N _Pre＜64, then need severally to generate leading subclass from different root sequences to obtain 64 an of sub-district leading.Though the cross-correlation between the different root sequences is very little, still greater than the cross-correlation between the sequence that generates by an independent root sequence.So, if can't set the N of bigger probable value _Pre, N then _Pre=64 is useful for detecting performance.

Each length is N _ZCThe ZC sequence number that comprises of ZC arrangement set be N _ZC-1, when the number that is 64 leading root sequences of a sub-district of acquisition is N _rThe time,

Wherein

Expression is not less than the smallest positive integral of n, then the number N of non-crossing set _DFor

Different districts in the network should use by the non-crossing set of root sequence derive leading whether be defined as a specific sub-district so that be sent out leading is known in the base station.If number N for the root sequence of 64 leading needs obtaining a sub-district _rMany more, the number N of the non-crossing set of random access guiding _DJust few more.Therefore, from the viewpoint of the network planning, if the N of higher as far as possible numerical value can't be arranged _Pre, N then _Pre=64 is exactly suitable selection.

At present, the leading subclass that is generated by (1) formula can be called the set of a zero correlation block (ZCZ, Zero-Correlation Zone) sequence.The sets definition of zero-correlation zone sequence is as follows: as a set { d who has M sequence _v(k) }, v=0,1 ..., M-1, k=0,1 .., N-1, when sequence length was N, if auto-correlation and the their cross correlation of all sequences in this set below satisfying, then this set was the ZCZ arrangement set:

The periodic auto-correlation function ∑ _K=0 ^N-1d _v(k) d _v ^*((k+p) modN) for when 0＜| all p of p|≤T are zero, and periodic cross-correlation function ∑ _K=0 ^N-1d _v(k) d _w ^*((k+p) modN) is for working as | and all p of p|≤T (comprising p=0) are zero, and wherein, T is the length of ZCZ.

The ZC sequence has the ideal period auto-correlation, for example, and ∑ _K=0 ^N-1(k) x _u ^*((k+p) modN) is zero for the p of all nonzero values.Therefore, be the ZCZ arrangement set by the leading set that comes based on the definition of the cyclic shift of the root sequence of (1), its ZCZ length is T=N _CS-1.

According to

For the N of high as far as possible numerical value is arranged _Pre, N _CSShould be as much as possible little, but N _CSValue can not be too little, this be because, in the base station, use row's correlator when receiving random access guiding, leading a correlator arranged all corresponding to each.Each correlator output 0 to T * T _s=(N _CS-1) * T _sThe time of advent, wherein, T _sSymbol period for sequence.The ZCZ characteristic of leading set means that for any leading, if any other leading being sent out, the summation that needs only the time delay expansion of winding time and sub-district is less than or equal to length and the T of ZCZ _sProduct (be T * T _s), correlator will provide zero output.The maximum winding time T of a sub-district _rBe T by radius of society R decision _r=2R/c, wherein, c is the light velocity.So, for a specific cell, the minimum value of ZCZ length and N _CSThe minimum value of length increases along with radius of society, therefore, and the N of selection _CSValue must be enough greatly to guarantee to satisfy above condition.

Because the radius of society size that is supported in E-UTRA is from 1km to 100km, and N _CSShould be as much as possible little for any known sub-district, so there are a plurality of N _CSThe demand of value.In a sub-district, be to broadcast N to portable terminal by the base station _CSValue, certainly, ZCZ length also can be broadcasted to portable terminal in the base station so that portable terminal know how to go to generate leading.So in broadcast channel, should use the least possible signaling to pare down expenses.Therefore, in order to realize low signaling consumption, a limited N who pre-defines must be arranged _CSThe set or the ZCZ lengths sets of value.

At present, disclosed 3GPP Tdoc of in March, 2007 " R1-071661-On construction andsignaling of RACH preambles " proposes, and uses signal with cyclic shift increment size N _CSNotify portable terminal, but not the value of cyclic shift increment is not limited, so caused a large amount of relatively signaling consumptions.Disclosed 3GPP Tdoc of in March, 2007 " R1-071471-Outstanding issues in randomaccess preamble design for E-UTRA " has provided another relative scheme,, uses the N of 11 values that is _CSHow set does not select these values but specify.Certainly, above-mentioned two files more not explanation how to select ZCZ length.So, also there is not a kind of feasible scheme at present, be used to select the finite aggregate of a reasonable ZCZ length, to guarantee less limited signaling consumption.

Summary of the invention

The embodiment of the invention provides a kind of method, device and mobile communication system of definite length set of zero-correlation zone, selects the finite aggregate of a reasonable ZCZ length with realization, and then improves the quality that portable terminal inserts at random, and reduce the expense of signaling.

The embodiment of the invention provides a kind of method of definite length set of zero-correlation zone, comprising: the length of determining the root sequence; Select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

The embodiment of the invention provides a kind of device of definite length set of zero-correlation zone, comprising: the length determining unit is used for determining the length of root sequence; The set selected cell, be used to select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

The embodiment of the invention provides a kind of base station, comprising: the length determining unit is used for determining the length of root sequence; The set selected cell, be used to select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

The embodiment of the invention provides a kind of mobile communication system, comprises base station and portable terminal, shown in the base station be used for carrying out alternately with portable terminal, specify a zero correlation section length in the length set of zero-correlation zone to described portable terminal; Described portable terminal is used for the zero correlation section length according to the appointment of described base station, generates leadingly, and uses and leadingly sends upward signal to described base station; Described length set of zero-correlation zone is a such length set of zero-correlation zone, for any radius of society, the leading quantity of from described length set of zero-correlation zone, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

In an embodiment of the present invention, the finite aggregate of the ZCZ length of selection should meet some requirements, and this has just provided the technical scheme of the finite aggregate of a reasonable ZCZ length of a kind of selection, thereby has reduced the expense of signaling.

Description of drawings

Fig. 1 is the flow chart of the inventive method embodiment;

Fig. 2 is the schematic diagram that concerns between the leading quantity of maximum of the embodiment of the invention and the radius of society;

Fig. 3 be the embodiment of the invention radius of society at interval the maximum maximal phase in the k to the gap schematic diagram;

The structure chart of the base station that Fig. 4 provides for the embodiment of the invention;

The schematic diagram of the mobile communication system that Fig. 5 provides for the embodiment of the invention.

Embodiment

At first in conjunction with Fig. 1, the overall technical architecture of the embodiment of the invention is described.As shown in Figure 1, comprising:

Step S101: the length of determining the root sequence;

Step S102: select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

In an embodiment of the present invention, need at first to guarantee that the product of symbol period of ZCZ length and sequence is greater than the summation of the time delay expansion of winding time and sub-district, promptly, T * Ts＞Tr+Td, wherein, T is a ZCZ length, Ts is a symbol period, and Tr is the winding time, and Td is the time delay expansion.

Because the maximum winding time T r of a sub-district is by radius of society R decision, that is, Tr=2R/c, wherein, c is the light velocity, so T * Ts＞Tr+Td can replace with T * Ts＞2R/c+Td.

Again because T=NCS-1, can get NCS＞1+ (2R/c+Td)/Ts thus so T * Ts＞2R/c+Td can replace with (NCS-1) * Ts＞2R/c+Td.

In addition, because

So, Like this, Npre just can be used as the function of radius of society R, and certainly, radius of society also can change, and the value of Npre reduces along with the growth of NCS value.

In an embodiment of the present invention, the finite aggregate that needs the such NCS value of structure, promptly, under certain radius of society, the pairing Npre of minimum NCS value that is applicable to this sub-district that assurance is selected from this finite aggregate, the most approaching with the pairing Npre of minimum NCS value that is applicable to this sub-district that from all integer set, selects.Further, can construct a maximal phase to gap by Npre, this maximal phase is that maximal phase between the definite Npre (R) of Npre (R) that is determined by the minimum NCS value that is applicable to this sub-district in the integer set and the minimum NCS value of selecting from described finite aggregate that is applicable to this sub-district is to gap to gap, if the described finite aggregate of determining at last or selecting makes maximal phase between the definite Npre (R) of the minimum NCS value that is applicable to this sub-district Npre (R) that determines and the minimum NCS value of selecting from described finite aggregate that is applicable to this sub-district that selects in the integer set to the gap minimum in the sub-district of any radius, then this finite aggregate be exactly need set.

As shown in Figure 2, what A represented is for any one radius of society, can get to make its targeting sequencing that produces maximum targeting sequencing number and generation be used as the N of this sub-district at the operable integer in this sub-district from the integer set _CsThat B represents is a N _CsSet, wherein comprise limited N _Cs, this limited N _CsBe applied in the sub-district of all radiuses, within the scope of some radius of societies, all radius of societies can use identical N so _Cs, this N so _CsShould determine that compare with A like this, the leading number of generation will reduce according to the largest cell radius in this radius of society scope.

Under these conditions, make any one N if guarantee the described finite aggregate of selecting _CSThe N that value is determined _Pre(R) with the N that from described finite aggregate, selects _CSThe N that value is determined _Pre(R) maximal phase between is to the gap minimum, and supposes any one N _CSThe N that value is determined _Pre(R) be A (R), the N that selects in the described finite aggregate _CSThe N that value is determined _Pre(R) be B (R), then A (R) and B (R) are respectively as shown in Figure 2.

As shown in Figure 2, between A (R) and the B (R) certain departing from arranged.For certain radius of society R, depart from the number that can increase between A (R) and the B (R) to root sequence required under this radius of society R, the increase of this root sequence number is for big radius of society N _PreVery important when very little.For example, when A (R)=3 and B (R)=2, the number of root sequence significantly increases, and is concrete, by

Individual arriving

Individual.So,, should estimate the poor of A (R) and B (R), to being worth less N for departing between correct measurement A (R) and the B (R) _PreCan use higher weight.For example, maximal phase between consideration use A (R) and the B (R) is to gap, promptly, [A (R)-B (R)]/A (R), for all radius of societies, can adopt maximal phase between A (R) and the B (R) to the measurement of gap, and find the N of the minimum deviation that makes measurement as deviation between A (R) and the B (R) _CSThe set of value, this set can be by a N _CS=0 and the N of K+1 nonzero value _CSForm N in the set _CSTotal number of value is K+2.

For example: in a less sub-district, if

It is leading to generate 64 ZCZ from a single sequence, and this value is set N _CS(k) minimum value in.

Maximum N _CS(K), allow to generate 2 ZCZ sequences from a single sequence, institute thinks

For the sub-district of maximum, each root sequence only generates a random access guiding, therefore, and N _CS(K+1)=0.

Maximal phase between A (R) and the B (R) is to gap, i.e. [A (R)-B (R)]/A (R) is at [(r (k-1), r (k)] in the scope, be spacing with k, non-increasing on radius of society R, can be referring to Fig. 2, wherein, r (k) represents k radius of society of ascending arrangement.This is because B (R) is a constant within this scope, but A (R) is under given radius of society R, for possible minimum N _CSBe inverse proportion.This N _CSValue in other words, increased with radius of society R along with the winding time.

Suppose in the radius of society interval [(r (k-1), r (k)], set A (R) is N in the quantity of the maximum targeting sequencing in this interval _Pre(k-1)-1, set B (R) is fixed against radius of society r (k) in this interval maximum leading quantity that produces, and promptly maximum leading quantity is N _Pre(k), so the maximum maximal phase in the k of interval to gap D _k, can obtain by following formula:

$D_k=\frac{N_{\mathrm{pre}}(k-1)-1-N_{\mathrm{pre}}\left(k\right)}{N_{\mathrm{pre}}(k-1)-1}$

If D _kAnd N _Pre(k-1) provide, then can obtain N by rearranging following formula _Pre(k), that is, and N _Pre(k)=(1-D _k) (N _Pre(k-1)-1)

With respect to the maximal phase of all radius of societies to gap D _Max, can by $D_{\max }=\max {\left\{D_k\right\}}_{k=1}^K$ Obtain.

For N _Pre(k), at first make N _Pre(k) be real number, and then this real number is rounded up to obtain immediate integer.In addition, N _Pre(0) and N _Pre(K) be the value of fixing.

Therefore, if all D _kAll equate, for example D _k=D, k=1,2 ..., K, then D _MaxFor minimum.Below this is proved.

Set { the N of a value of structure _Pre ⁽¹⁾(k) } _K=0 ^K, being restricted to when k=0 and k=K of selection, $N_{\mathrm{pre}}^{\left(1\right)}\left(k\right)=N_{\mathrm{pre}}\left(k\right),$ $D_k^{\left(1\right)}=D,$ k＝1，2，...，K。Set hereto, D _Max=D.

Construct the set { N of another value again _Pre ⁽²⁾(k) } _K=0 ^K, it is restricted to when k=0 and k=K $N_{\mathrm{pre}}^{\left(2\right)}\left(k\right)=N_{\mathrm{pre}}\left(k\right),$ D _Max＜D, perhaps $D_k^{\left(2\right)}<D_k^{\left(1\right)},$ k＝1，2，...，K。

When k=1, because $D_1^{\left(2\right)}<D_1^{\left(1\right)}$ And $N_{\mathrm{pre}}^{\left(2\right)}\left(0\right)=N_{\mathrm{pre}}^{\left(1\right)}\left(0\right),$ According to N _Pre(k)=(1-D _k) (N _Pre(k-1)-1), obtain $N_{\mathrm{pre}}^{\left(2\right)}\left(1\right)>N_{\mathrm{pre}}^{\left(1\right)}\left(1\right).$

When k=2, $D_2^{\left(2\right)}<D_2^{\left(1\right)}$ And $N_{\mathrm{pre}}^{\left(2\right)}\left(1\right)>N_{\mathrm{pre}}^{\left(1\right)}\left(1\right),$ According to N _Pre(k)=(1-D _k) (N _Pre(k-1)-1), obtain $N_{\mathrm{pre}}^{\left(2\right)}\left(2\right)>N_{\mathrm{pre}}^{\left(1\right)}\left(2\right).$

The rest may be inferred, for all k, because $N_{\mathrm{pre}}^{\left(2\right)}\left(K\right)=N_{\mathrm{pre}}^{\left(1\right)}\left(K\right)=N_{\mathrm{pre}}\left(K\right),$ So $N_{\mathrm{pre}}^{\left(2\right)}\left(k\right)>N_{\mathrm{pre}}^{\left(1\right)}\left(k\right)$ Be invalid.

Therefore, can not value set N of structure _Pre(k) to guarantee D _Max＜D is if proved D thus _kEquate, for example D _k=D, k=1,2 ..., K, then D _MaxBe minimum.

Like this, just can find and make D _MaxMinimum value set { N _Pre(k) } _K=0 ^K

Replace N with D _Pre(k)=(1-D _k) (N _Pre(k-1)-1 the D) _k, and rearrange, can draw following linearity difference formula:

N _Pre(k)-aN _Pre(k-1)=-a, wherein, a=(1-D).

Can recursion obtain by following formula $N_{\mathrm{pre}}\left(k\right)=N_{\mathrm{pre}}\left(0\right)a^k+\frac{a}{1-a}(a^k-1).---\left(3\right)$

Following formula and the boundary condition N that obtains by recursion again _Pre(0) and N _Pre(K), just can determine a in number.

For example, the maximum leading quantity of a root sequence generation is 64, i.e. N _Pre(0)=64, to change the minimum leading number that obtains of displacement be 2 by following, such as, N _Pre(14)=2, then can obtain a=0.856, and then just can obtain all N by these two parameters _Pre(k), k=1,2 ....

Be similar to minimize by a sub-optimal algorithm and guarantee that maximal phase is to the gap minimum, promptly by the maximum of zero correlation block random access guiding is supposed that the maximal phase of real number quantity minimizes gap, and then zero correlation block is inserted maximum leading quantity at random quantize the following explanation of concrete grammar.

By right $N_{\mathrm{pre}}\left(k\right)=N_{\mathrm{pre}}\left(0\right)a^k+\frac{a}{1-a}(a^k-1)$ In supposition real number quantity N _Pre(k) value rounds for the first time and can obtain following formula:

Wherein,

Expression is not more than the maximum integer of x, N _ZCBe the length of root sequence, N _Pre(0) expression is the maximum leading quantity that the root sequence produces.

Still above example is an example, if N _Pre(0)=64, N _Pre(14)=2, obtain a=0.856 according to formula (3); And then if work as N _ZC=839 o'clock, the N that obtains according to formula (4) _Cs(k), k=0,1,2 ..., 14 is as shown in table 1.

Table 1:

k	N CS(k)
		0	13
1	15
		2	18
3	22
		4	26
5	32
		6	38
7	46
		8	59
9	76
		10	93
11	119
		12	167
13	279
		14	419

If during for king-sized sub-district, the targeting sequencing that obtains has only one, is exactly sequence itself, at this moment N _Cs=0, this value is added can table 2 in the top table.

Table 2:

k	N CS(k)
		0	13
1	15
		2	18
3	22
		4	26
5	32
		6	38
7	46
		8	59
9	76
		10	93
11	119
		12	167
13	279
		14	419
15	0

At last, the true integer value of Npre (k) from

The middle acquisition, that is, and for some value N of k _ZC/ N _CS(k) greater than the value Npre that rounds (k).As shown in Figure 3, when K=14, the value of the Dk that obtains from the real number value of Npre (k) is D=0.144.As seen from Figure 3, the true integer value of Npre (k) can cause Dk to depart from from D, but except the sub-district of two maximums, for all the other all sub-districts, depart from still very little, so the finite aggregate of the NCS value of this selection is suitable available.

Need to prove that if determine the finite aggregate of NCS value, then the finite aggregate of ZCZ length also can be determined, and is concrete, can be according to T=NCS-1.

Accordingly, the present invention also provides a kind of device embodiment of definite length set of zero-correlation zone, as shown in Figure 4, comprising: length determining unit 410 is used for determining the length of root sequence; Set selected cell 420, be used to select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

Described set selected cell 420 can comprise: module 421 is selected in the set of cyclic shift increment, be used to select such cyclic shift increment set, for any radius of society, from the cyclic shift increment set of described selection, select to be applicable to the leading quantity of the determined maximum of cyclic shift increment of this sub-district, the most approaching with the leading quantity of from all integer set, selecting of the determined maximum of cyclic shift increment that is applicable to this sub-district, wherein, the leading quantity of described maximum is determined by the length of root sequence and the cyclic shift increment of selection; Length set of zero-correlation zone obtains module 422, is used for obtaining length set of zero-correlation zone according to the cyclic shift increment set of selecting.

In said apparatus embodiment, the cyclic shift increment of selecting from the cyclic shift increment set of described selection is a minimum cyclic shift increment during the cyclic shift increment of described selection is gathered, and the cyclic shift increment of selecting from all integers set is the cyclic shift increment of minimum in described all integer set.

The present invention also provides a kind of embodiment of base station, as shown in Figure 4, comprising: length determining unit 410 is used for determining the length of root sequence; Set selected cell 420, be used to select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

The present invention also provides a kind of embodiment of mobile communication system, as shown in Figure 5, comprise base station 400 and portable terminal 500, described base station 400 is used for carrying out alternately with portable terminal 500, a zero correlation section length in described portable terminal 500 appointment length set of zero-correlation zone; Described portable terminal 500 is according to the zero correlation section length of described base station 400 appointments, generates leadingly, and uses and leadingly sends upward signals to described base station 400; Described length set of zero-correlation zone is a such length set of zero-correlation zone, for any radius of society, the leading quantity of from described length set of zero-correlation zone, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection.

In above-mentioned mobile communication system embodiment, the cyclic shift increment of selecting from the cyclic shift increment set of described selection is the cyclic shift increment that is applicable to the minimum of this sub-district during the cyclic shift increment of described selection is gathered, and the cyclic shift increment of selecting from all integers set is the cyclic shift increment that is applicable to the minimum of this sub-district in described all integer set.

In sum, in an embodiment of the present invention, the finite aggregate of the NCS value of selecting should be a such set, promptly, within the scope of a plurality of radius of societies, the ZCZ that is determined by one in the described finite aggregate minimum NCS value that is applicable to these a plurality of sub-districts inserts maximum leading quantity and ZCZ by a plurality of NCS values acquisitions that are applicable to these a plurality of sub-districts in the integer set at random and inserts maximal phase between the maximum leading quantity at random to the gap minimum.Further, can select the finite aggregate of a ZCZ length, certainly, within the scope of a plurality of radius of societies, the ZCZ that a plurality of ZCZ length that are applicable to these a plurality of sub-districts during the ZCZ that is determined by one in the finite aggregate of described ZCZ length minimum ZCZ length that is applicable to these a plurality of sub-districts inserts maximum leading quantity at random and gathered by all integers are obtained inserts maximal phase between the maximum leading quantity at random to the gap minimum.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (16)

1. method of determining length set of zero-correlation zone in communication system is characterized in that comprising:

Select a cyclic shift increment set, described cyclic shift increment set comprises a cyclic shift increment N _CS=0 and the cyclic shift increment N of K+1 nonzero value _CS(k);

The cyclic shift increment of each nonzero value in the described cyclic shift increment set subtracts 1, obtains a length set of zero-correlation zone;

Wherein, described cyclic shift increment is used to produce random access guiding, the cyclic shift increment N of nonzero value _CS(k) generate by following formula:

Wherein,

Expression is not more than the maximum integer of x, and [x] expression rounds a=0.856, N to x _Pre(0)=64, N _ZC=839.

2. the method for claim 1 is characterized in that, described cyclic shift increment set is applicable to a plurality of radius of societies interval, a plurality of radius of societies of the interval corresponding described communication system of described radius of society, wherein,

One first cyclic shift increment in the described cyclic shift increment set is corresponding to one second cyclic shift increment in all integer set; The described first cyclic shift increment is applicable to a radius of society interval in described a plurality of radius of societies interval at least, and can determine one first maximum leading quantity for this radius of society is interval; The described second cyclic shift increment is suitable in this radius of society interval, and can determine one second maximum leading quantity in this radius of society interval; Wherein,

Element number in the described cyclic shift increment set is less than the element number in all integer set, and described leading quantity is definite by the length and the cyclic shift increment of root sequence, and,

Maximal phase between one first cyclic shift increment determined first maximum leading quantity and one the second cyclic shift increment determined second maximum leading quantity minimizes on described a plurality of radius of societies interval gap.

3. method as claimed in claim 2 is characterized in that, guarantees that in the following manner maximal phase is to the gap minimum: be similar to by a sub-optimal algorithm and minimize.

4. method as claimed in claim 2 is characterized in that, by the maximal phase with the maximum of zero correlation block random access guiding supposition real number quantity gap is minimized, and then the maximum leading quantity that zero correlation block inserts is at random quantized.

5. method as claimed in claim 2 is characterized in that, guarantees that in the following manner maximal phase is to the gap minimum:

For any one the radius of society interval in described a plurality of radius of societies interval, one first cyclic shift increment determined first maximum leading quantity all equates gap with maximal phase between one the second cyclic shift increment determined second maximum leading quantity.

6. method as claimed in claim 2 is characterized in that, described definite maximum leading quantity is generated by following formula:

$N_{\mathrm{pre}}\left(k\right)=N_{\mathrm{pre}}\left(0\right)a^k+\frac{a}{1-a}(a^k-1),k=\mathrm{1,2},...$

Wherein, N _Pre(0) be the maximum leading quantity that the root sequence produces, a=(1-D), D are that described maximal phase is to gap.

7. method as claimed in claim 6 is characterized in that, works as N _PreAnd N (0)=64 _Pre(14)=2 o'clock, obtain a=0.856.

8. method as claimed in claim 2 is characterized in that, the leading quantity of described maximum is generated by a single sequence.

9. method as claimed in claim 2, it is characterized in that, the first cyclic shift increment of selecting from described cyclic shift increment set is the cyclic shift increment of minimum applicatory in the described cyclic shift increment set, and the second cyclic shift increment of selecting from all integer set is the cyclic shift increment of minimum applicatory in described all integer set.

10. as the described method of arbitrary claim in the claim 2 to 9, it is characterized in that described sequence is the Zadoff-Chu sequence.

11., it is characterized in that the zero correlation section length in the described length set of zero-correlation zone and the product of symbol period are greater than the time delay expansion sum of winding time and sub-district as the described method of arbitrary claim in the claim 2 to 9.

12. a method of determining length set of zero-correlation zone in communication system is characterized in that comprising:

Select a cyclic shift increment set;

The cyclic shift increment of each nonzero value in the described cyclic shift increment set subtracts 1, obtains a length set of zero-correlation zone;

Wherein, described cyclic shift increment is used to produce random access guiding, described cyclic shift increment set N _CS(k) as shown in the table:

k N _CS(k) 0 13 1 15 2 18 3 22 4 26 5 32 6 38 7 46 8 59 9 76 10 93 11 119 12 167 13 279 14 419 15 0

13. method as claimed in claim 12 is characterized in that, described cyclic shift increment set N _CSThe cyclic shift increment of the nonzero value (k) is generated by following formula:

Wherein,

Expression is not more than the maximum integer of x, and [x] expression rounds a=0.856, N to x _Pre(0)=64, N _ZC=839.

14. a device of determining length set of zero-correlation zone in communication system is characterized in that, comprising:

Be used to select the unit of a cyclic shift increment set; With

Be used for the cyclic shift increment of each nonzero value of described cyclic shift increment set is subtracted 1, thereby obtain the unit of a length set of zero-correlation zone;

Wherein, described cyclic shift increment is used to produce random access guiding, described cyclic shift increment set N _CS(k) as shown in the table:

k N _CS(k) 0 13 1 15 2 18 3 22 4 26 5 32 6 38 7 46 8 59 9 76 10 93 11 119 12 167 13 279 14 419 15 0

15. a base station is characterized in that, comprising:

Length determining unit (410) is used for determining the length of root sequence;

Set selected cell (420), be used to select such length set of zero-correlation zone, for any radius of society, the leading quantity of from the length set of zero-correlation zone of described selection, selecting of the determined maximum of zero correlation section length that is applicable to this sub-district and can determines maximum leading quantity, with one that from the set of all integers, selects be applicable to this sub-district and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching, wherein, the leading quantity of described maximum is determined by the length of described sequence and the zero correlation section length of selection;

Described length set of zero-correlation zone obtains for subtracting 1 by the cyclic shift increment with each nonzero value in the cyclic shift increment set, described cyclic shift increment set N _CS(k) as shown in the table:

k N _CS(k) 0 13 1 15 2 18 3 22 4 26 5 32 6 38 7 46 8 59 9 76 10 93 11 119 12 167 13 279 14 419 15 0

16. a mobile communication system is characterized in that, comprises base station (400) and portable terminal (500),

Described base station is used for carrying out alternately with portable terminal, a zero correlation section length in described portable terminal appointment length set of zero-correlation zone;

Described portable terminal is according to the zero correlation section length of described base station appointment, generates leadingly, and uses and leadingly sends upward signal to described base station;

Described length set of zero-correlation zone is a such length set of zero-correlation zone; For any radius of society; The leading quantity of the determined maximum of zero correlation section length that is applicable to this residential quarter and can determines maximum leading quantity of from described length set of zero-correlation zone, selecting; With one that from the set of all integers, selects be applicable to this residential quarter and can determine the leading quantity of the determined maximum of zero correlation section length of maximum leading quantity the most approaching; Wherein, The leading quantity of described maximum is determined by the length of root sequence and the zero correlation section length of selection

Described length set of zero-correlation zone obtains for subtracting 1 by the cyclic shift increment with each nonzero value in the cyclic shift increment set, described cyclic shift increment set N _CS(k) as shown in the table:

k N _CS(k) 0 13 1 15 2 18 3 22 4 26 5 32 6 38 7 46 8 59 9 76 10 93 11 119 12 167 13 279 14 419 15 0

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