CN101674277B - Method for generating a reference signal sequence using grouping - Google Patents

Abstract

Method for generating reference signal sequence using grouping is explained. In this method, base sequences are grouped such that each group contains at least one base sequence of each length, so UE(s) can use various length sequences as a reference signal. And in this method, inter cell interference caused by using various length sequence as a reference signal sequence can be minimized by grouping sequences having the high cross correlation relation.

Description

Utilize the method for grouping generating reference signal sequence

The application is that the original bill application number is 200880003910.8 application for a patent for invention (international application no: PCT/KR2008/000629, the applying date: on February 1st, 2008, denomination of invention: the dividing an application method of utilizing grouping generating reference signal sequence).

Technical field

The present invention relates to the method for the generating reference signal sequence, more particularly, relate to method, the method that is used for the generating reference signal sequence that the sequence with variable-length corresponding with one or more Resource Block sizes is divided into groups and the method for using Zadoff-Chu (ZC) sequence generating reference signal sequence.

Background technology

Following explanation is mainly discussed around 3GPP LTE system, but the invention is not restricted to this system, and exemplary 3GPP LTE system only is in order to allow those skilled in the art can more clearly understand the present invention.

There are many sequences for transmitted signal, but (3rd GenerationPartnership Project Long Term Evolution: third generation partner program Long Term Evolution) in the system, (Constant Amplitude Zero Auto-Correlation: permanent envelope zero auto-correlation) sequence has formed the basic sequence of transmitted signal to CAZAC at 3GPP LTE.The CAZAC sequence can be used for various channels with extract ID or control information (such as, main SCH) and S-SCH (Secondary SCH: uplink/downlink synchronization channel (SCH) auxiliary SCH) be used for to send the pilot channel of reference signal) comprise P-SCH (Primary SCH:.Simultaneously, the CAZAC sequence can be used in the scrambling (scrambling).

Mainly contain two kinds of CAZAC sequences (that is, GCL CAZAC sequence and Zadoff-ChuCAZAC sequence) and be used as the CAZAC sequence.This CAZAC sequence of two types is associated with each other by the conjugate complex number relation.That is to say, can access GCL CAZAC sequence by Zadoff-Chu CAZAC sequence is carried out the conjugate complex number computing.Zadoff-Chu CAZAC sequence is expressed as follows:

[formula 1]

$c(k;N,M)=\exp \left(\frac{\mathrm{j\πMk}(k+1)}{N}\right)$ (N is odd number)

[formula 2]

$c(k;N,M)=\exp \left(\frac{\mathrm{j\πM}{k}^2}{N}\right)$ (N is even number)

Wherein, k represents the index of sequence composition, the length of the CAZAC sequence that N indicates to generate, and M represents serial ID or sequence index.

When using c (k; N, M) when representing the Zadoff-Chu CAZAC sequence that provided by formula 1 and formula 2 and having the GCL CAZAC sequence of conjugate complex number relation with Zadoff-Chu CAZAC sequence, these sequences can have following three features.

[formula 3]

| C (k; N; M) |=1 (for all k, N, M)

[formula 4]

[formula 5]

R _{M1, M2; N}(d)=p is (for all M ₁, M ₂And N)

Formula 3 means that the size of CAZAC sequence is 1 all the time, is represented by the delta function and formula 4 shows the auto-correlation function of CAZAC sequence.In this case, this auto-correlation is based on circular correlation.Equally, formula 5 shows cross-correlation and is always constant.

In these two kinds of CAZAC sequences, following explanation mainly concentrates on Zadoff-ChuCAZAC sequence (after this being called " ZC sequence ").

In 3GPP LTE system, as reference sequences, the length of this ZC sequence should equal the size of Resource Block with this ZC sequence.Simultaneously, not only use a Resource Block size sequence, can also use the reference signal sequence with length corresponding with a plurality of Resource Block sizes.

For single-cell environment, (Frequency Division Multiplexing: method frequency division multiplexing) sends reference signal to carry out multiplexing to the signal from a plurality of subscriber equipmenies (UE) by centralized FDM.But for the environment of many residential quarters, (CodeDivision Multiplexing: method code division multiplexing) sends reference signal to distinguish the signal from neighbor cell by additional (additional) CDM.In this was multiplexing, it was feasible that two kinds of methods are arranged.A kind of is the CDM method of using the ZC sequence with different root index, and another kind is to use the CDM method that has same root index (M) but differentially used the ZC sequence of cyclic shift.

When the length of the reference signal of the ZC sequence of using these types was identical, the cross correlation value in two kinds of situations was all little.But, when the reference signal with different length as arriving from the interference of neighbor cell and being sent out or when crossover occurs frequency range, cross correlation value will be very large by identical frequency range.

Summary of the invention

Technical problem

Therefore, the present invention aims to provide a kind of method for the generating reference signal sequence, and the method makes the minimum interference that is caused by the signal with different length from neighbor cell.

For this method, the present invention also provides a kind of method, and the method can be divided into groups to sequence efficiently so that each group is comprised of the sequence with high cross correlation value, and supports the sequence of variable-length is used as reference signal.

Equally, the invention provides a kind of method of the generating reference signal sequence based on above-mentioned grouping.

Technical scheme

In order to realize these purposes and other advantage, according to purpose of the present invention, as implementing and extensively describe ground herein, a kind of method for the sequence with variable-length corresponding with one or more Resource Block sizes is divided into groups is provided, the method may further comprise the steps: so that comprise the mode of at least one sequence of every kind of length in each group described sequence is divided into groups, wherein, sequence after the grouping is the basic sequence that is used to use the cyclic shift corresponding with variable cyclic shift value, and the described basic sequence that will carry out described cyclic shift is as reference signal sequence.

Preferably, described group quantity is 30.

And, carry out by this way described grouping, that is, each group comprises a basic sequence with 1 to 5 times of every kind of corresponding length of described Resource Block size, and two basic sequences that comprise the every kind length corresponding with 6 times of described Resource Block size or more times.

And, preferably, utilize Zadoff-Chu (ZC) sequence to define to have the basic sequence of the length corresponding with 3 times of described Resource Block size or more times, and utilize other sequence except the ZC sequence to define to have the basic sequence of the length corresponding with 1 times of described Resource Block size or 2 times.

In another aspect of the present invention, provide a kind of method of generating reference signal sequence.In an execution mode aspect this, the method may further comprise the steps: definition has one or more basic sequence of the variable-length corresponding with one or more Resource Block sizes; And the described basic sequence to definition is used the cyclic shift corresponding with variable cyclic shift value, wherein, described basic sequence is divided into groups, and each group comprises at least one basic sequence of every kind of length.

In this case, by length being served as reasons less than the specified (N of largest prime number of corresponding reference signal sequence size _ZC ^RS) the ZC sequence carry out cyclic extensions and define described basic sequence.Can also be by length being served as reasons greater than the specified (N of minimum prime number of corresponding reference signal sequence size _ZC ^RS) the ZC sequence carry out brachymemma and define described basic sequence.

In this execution mode, preferably, described group quantity is 30 equally.

And each described group comprises a basic sequence with 1 to 5 times of every kind of corresponding length of described Resource Block size, and two basic sequences of the every kind length corresponding with 6 times of described Resource Block size or more times.

And, Zadoff-Chu (ZC) sequence that utilization has a specific ZC sequence index (q) defines the basic sequence with length corresponding with 3 times of described Resource Block size or more times, and utilizes other sequence except the ZC sequence to define to have the basic sequence of the length corresponding with 1 times of described Resource Block size or 2 times.

And preferably, described specific ZC sequence index (q) is the function of the basic sequence number index (v) in group index (u) and this group.

And, defined basic sequence of carrying out cyclic shift can be used for the uplink reference signals sequence.

For above execution mode, described Resource Block size can be corresponding to the size of 12 subcarriers in frequency domain equally.

In another aspect of this invention, a kind of method of utilizing Zadoff-Chu (ZC) sequence generating reference signal sequence, in an execution mode aspect this, the method may further comprise the steps: utilize q ZC root sequence to define specific basic sequence, wherein described basic sequence is divided into groups, and " q " is the function of the basic sequence number index (v) in group index (u) and this group; And the basic sequence of definition is used the cyclic shift corresponding with the cyclic shift value of variable-length to generate described reference signal sequence.

In one case, determine described specific ZC sequence index (q) by one in the following formula,

$\left(1\right),q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\},$

$\left(2\right),q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein, $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\},$ Perhaps

$\left(3\right),q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein, $y=\mathrm{round}\left(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}\right)\·(u+1),u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

Wherein, N _ZC ^RSBy the length of coming appointment less than the largest prime number of the size of corresponding reference signal sequence, N _{Reference, zc} ^RSBe corresponding reference signal sequence size, " round (z) " is the function that is rounded near the nearest integer of z, and " floor (z) " is the function that obtains being not more than the maximum integer of z.But, for another embodiment of the invention, N _ZC ^RSCan be by the length of coming appointment greater than the minimum prime number of corresponding reference signal sequence.

In another case, determine described specific ZC sequence index (q) by one in the following formula,

$\left(1\right),q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

$\left(2\right),q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein, $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\},$ Perhaps

$\left(3\right),q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\·{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein, $y=\mathrm{floor}(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}+0.5)\·(u+1),u\∈\{\mathrm{0,1},...,29\},v\∈\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}.$

Wherein, N _ZC ^RSBy the length of coming appointment less than the largest prime number of the size of corresponding reference signal sequence, N _{Reference, zc} ^RSBe corresponding reference signal sequence size, " round (z) " is the function that is rounded near the nearest integer of z, and " floor (z) " is the function that obtains being not more than the maximum integer of z.But, for another embodiment of the invention, N _ZC ^RSCan be by the length of coming appointment greater than the minimum prime number of corresponding reference signal sequence.But, for another embodiment of the invention, can specify N by the minimum prime number of size greater than the described basic sequence of definition _ZC ^RS

In an embodiment of this invention, can be 2 with the maximum quantity of the described basic sequence number index (v) in each group, and, then determine described specific ZC sequence index (q) by one of following formula,

(1)

q＝round(y)+v·(-1) ^floor(2y)

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},u\∈\{\mathrm{0,1},...,29\},v\∈\left\{\mathrm{0,1}\right\}$

(2)

q＝round(y)+v·(-1) ^floor(2y)

Wherein, $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},u\∈\{\mathrm{0,1},...,29\},v\∈\left\{\mathrm{0,1}\right\},$ Perhaps

(3)

q＝round(y)+v·(-1) ^floor(2y)

Wherein, $y=\mathrm{round}\left(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}\right)\·(u+1),u\∈\{\mathrm{0,1},...,29\},v\∈\left\{\mathrm{0,1}\right\}.$

Perhaps determine this specific ZC sequence index (q) by one of following formula,

(1)

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},$ u∈{0，1，...，29}，v∈{0，1}

(2)

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein, $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\·(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},u\∈\{\mathrm{0,1},...,29\},v\∈\left\{\mathrm{0,1}\right\},$ Perhaps

(3)

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein, $y=\mathrm{floor}(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}+0.5)\·(u+1),u\∈\{\mathrm{0,1},...,29\},v\∈\left\{\mathrm{0,1}\right\}.$

Preferably, can be with N _{Reference, zc} ^RSBe set to 31 or 37, but also can be with N _{Reference, zc} ^RSBe set to other value.

Beneficial effect

These execution modes according to this invention, because will be used to the basic sequence of application cycle displacement divides into groups, and each group comprises at least one basic sequence of every kind of length, when giving a residential quarter or Node B with specific set of dispense, UE can be used as reference signal sequence with the sequence of every kind of length.

In addition, because each group comprises the basic sequence with high cross-correlation relation, so, if give a residential quarter or Node B with each set of dispense, then can make intercell interference.

Description of drawings

Fig. 1 shows the concept map for the sequence generating method of explanation brachymemma.

Fig. 2 shows the concept map that adopts the generation method of filling (padding) part for explanation.

Fig. 3 to 5 shows the concept map that sequence is divided into groups according to an embodiment of the invention.

Embodiment

Below, at length introduce with reference to the accompanying drawings preferred implementation of the present invention.Should be appreciated that, be intended to introduce illustrative embodiments of the present invention with the disclosed detailed description of accompanying drawing, rather than be intended to introduce and realize unique execution mode of the present invention.

Below, detail specifications comprises provides comprehend particular content of the present invention.But it should be apparent to those skilled in the art that not to need these concrete contents to carry out the present invention.Fuzzy in order to prevent that concept of the present invention from occuring, omitted structure and the device of known technology, perhaps will illustrate based on the major function of each structure and the device form according to block diagram.Equally, in drawing and description as far as possible in the whole text the same reference numerals of usefulness refer to same or similar part.

As mentioned above, the present invention aims to provide a kind of method of generating reference signal sequence, the minimum interference that the method causes the signal with different length from neighbor cell.

For realizing this purpose, the length of CAZAC sequence is described.

At present, in 3GPP LTE system, be used for to send the size of Resource Block (RB) of the various types of OFDM symbols that comprise the reference signal symbol corresponding to the size of 12 subcarriers.Therefore, when generating ZC for the uplink reference signals sequence, the size of ZC sequence will be corresponding to the size of 12 subcarriers.

For the situation of CAZAC sequence, by determining to distinguish the quantity of CAZAC sequence index (M) each other with the quantity of the relatively prime mutual prime rwmber of sequence length (N).Therefore, when generation length was 12 ZC sequence, the quantity with ZC sequence of different sequence index was 4.But if generate the ZC sequence based on prime length (N), the quantity that then has the ZC sequence of different sequence index is N-1, and this is so that the quantity maximization of ZC sequence.Therefore, provide the whole bag of tricks that be used for to generate the CAZAC sequence based on prime length.

The sequence generating method of brachymemma at first, is described.

Fig. 1 shows the concept map for the sequence generating method of explanation brachymemma.

As shown in Figure 1, when the length of required CAZAC sequence is " L ", generated " X " (wherein, the CAZAC sequence of X＞L) that has prime length.Simultaneously, the length that generates is punctured into length " L " for the CAZAC sequence of " X ", that is to say, the Sequence of length " X-L " is clipped.

By this method, make the quantity maximization of CAZAC sequence.But, because clipped the sequence that partly generates, reduced to a certain extent the CAZAC sequence of utilizing formula 4 and formula 5 explanations from/their cross correlation.Simultaneously, when having eliminated the sequence with relatively poor correlation properties, the actual quantity of sequence reduces.In addition, owing to brachymemma, also reduced the good PAPR characteristic of CAZAC sequence.

Therefore, method based on other type of the generation CAZAC sequence of prime number has been proposed.One of these methods are to generate and to have prime length " X " (wherein, the CAZAC sequence of X＜L), and the CAZAC sequence of the part of length " L-X " being added to this generation.The part of adding the sequence of this generation to can be called filling part (padding part), this method can be called the generation method that adopts filling part thus.

Fig. 2 shows the concept map that adopts the generation method of filling part for explanation.

As shown in Figure 2, when the length of required CAZAC sequence is " L ", generated the CAZAC sequence of length for " X " (X is the largest prime number less than " L ").The sequence of simultaneously, adding length to this generation for the filling part of " L-X ".

In the method in such method, filling part can form by 0.By the method, can make the quantity maximization of CAZAC sequence.In addition, when carrying out the differentiation (distinction) of sequence about the length " C1 " of Fig. 2, can keep the CAZAC sequence from/their cross correlation.

Simultaneously, preferably, filling part can be the cyclic extensions of CAZAC sequence.That is to say, can carry out recursive copying by the first to the CAZAC sequence that generates and generate filling part (C2), and add it sequence of generation to.By such operation, even when carrying out the differentiation of sequence about whole sequence length (L), the sequence that generates also can have good in-their cross correlation.Therefore, the method further is better than filling part as 0 said method.

Use the present invention of CAZAC sequence generating reference signal sequence mainly based on the generation method of using the filling part that generates by above-mentioned cyclic extensions.But the present invention is not limited to this generation method, that is to say, the present invention can and use generation method by 0 filling part that forms based on the sequence generating method of brachymemma.

Based on this, the presence of intercell interference that causes having the sequence of different length by use describes.

When with the CAZAC sequence when the reference signal sequence, the cross correlation value between presence of intercell interference and two sequences is proportional.Therefore, in the example below, with the index of ZC sequence consider relevantly by the original reference signals that sends by specific resources zone and from neighbor cell, have the length that is different from this original reference signals and the arrival sequence that sends by identical resource area between the cross correlation value that causes of crossover.

More particularly, in following example, consideration length is the sequence of 1RB, 2RB and 3RB.Simultaneously, our hypothesis is by to become length next life be the sequence of 1RB and 2RB by carry out cyclic extensions less than the ZC sequence of the length of the largest prime number appointment of the Resource Block size of correspondence to having.Simultaneously, we utilize the sequence method of formation of brachymemma to become length to be the sequence of 3RB next life at hypothesis.That is to say, by one in above-mentioned three kinds of generation methods, can generate the sequence with corresponding Resource Block size based on prime length.

At first, the situation of consideration when the sequence with 1RB length in the same asset zone crossover occurs with the sequence with 2RB length.Sequence with 1RB length can followingly represent with the sequence with 2RB length:

[formula 6]

$g_{1\mathrm{RB}}(k;s_1)=e^{-j\frac{\mathrm{\π}}{N_1}{s}_{1}k(k+1)},$ k＝0，...，N-1

${\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2\mathrm{RB}}(k;s_2)=e^{-j\frac{\mathrm{\&pi;}}{N_2}{s}_{2}k(k+1)},$ k＝0，...，2N-1

Here, S ₁And S ₂The index that expression is relatively prime with sequence length (N or 2N).In this example, because employing cyclic extensions method generates the sequence with 1RB length and the sequence with 2RB length so S ₁Can be 1,2 ..., 10, and S ₂Can be 1,2 ..., 22.Simultaneously, N ₁Can be 11, and N ₂Can be 23.

Based on this, the cross correlation value (c (d that when the sequence with 1RB length in front 12 subcarriers zone of the sequence with 2RB length crossover occurs with the sequence with 2RB length, generates; S ₁, S ₂)) can be expressed as follows:

[formula 7]

$c(d;s_1,s_2)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{g}_{1\mathrm{RB}}(k;s_1){\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2\mathrm{RB}}^{*}(k+d;s_2)$

For?d＝0，

$c(0;s_1,s_2)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\exp (-j\frac{\mathrm{\&pi;}}{N_1}{s}_1\mathrm{mod}(k,N-1)(\mathrm{mod}(k,N-1)+1))\exp \left(j\frac{\mathrm{\&pi;}}{N_2}{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\mathrm{mod}(k,2N-1)(\mathrm{mod}(k,2N-1)+1)\right)$

$=\left[\underset{k=0}{\overset{10}{\mathrm{\&Sigma;}}}\exp \right\{\mathrm{j\&pi;k}(k+1)(\frac{{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2}{23}-\frac{s_1}{11})\left\}\right]+\exp (j\frac{\mathrm{\&pi;}}{23}{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\&CenterDot;11\&CenterDot;12)$

According to formula 7, should be appreciated that, if sequence index (S ₁And S ₂) combination satisfy

Near 0 condition, then by the high cross-correlation of sequence generation of these sequence index indications.

Therefore, an embodiment of the invention propose by this way sequence to be divided into groups, that is, the sequence that comprises in each group has high cross-correlation relation each other.Simultaneously, if consider the sequence of 1RB length and the sequence of 2RB length, then advise satisfying

Divide into groups near the combination of the sequence index of 0 condition.

But for the more general conditions that is identified for sequence is divided into groups, we consider some other examples.

When crossover occurs in rear 12 subcarriers zone of 2RB sequence in the 1RB sequence, the cross correlation value of two sequences (c (d; S ₁, S ₂)) can be expressed as follows:

[formula 8]

$c(d;s_1,s_2)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{g}_{1\mathrm{RB}}(k;s_1){\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">g</figure-callout>}}_{2\mathrm{RB}}^{*}(k+12+d;s_2)$

For?d＝0，

$c(d;s_1,s_2)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\exp (-j\frac{\mathrm{\&pi;}}{N_1}{s}_1\mathrm{mod}(k,N-1)(\mathrm{mod}(k,N-1)+1))\exp \left(j\frac{\mathrm{\&pi;}}{N_2}{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\mathrm{mod}(k+12,2N-1)(\mathrm{mod}(k+12,2N-1)+1)\right)$

$=\left[\underset{k=0}{\overset{10}{\mathrm{\&Sigma;}}}\exp \right\{\mathrm{j\&pi;k}(k+1)(\frac{{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2}{23}-\frac{s_1}{11})+\frac{{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2}{23}\&CenterDot;12\&CenterDot;(2k+13)\left\}\right]+1$

According to formula 8, also can reach a conclusion, if sequence index (S ₁And S ₂) combination satisfy

Near 0 condition, the cross-correlation that the sequence generation that is then represented by these sequence index is high.Therefore, if consider the sequence of 1RB length and the sequence of 2RB length, the position that crossover then occurs does not change a minute set condition.

Then, we consider that the situation of crossover occurs the sequence when the sequence of 1RB length and 3RB length in the same asset zone.

At first, the sequence of the sequence of 1RB length and 3RB length can be expressed as follows:

[formula 9]

$g_{1\mathrm{RB}}(k;s_1)=e^{-j\frac{\mathrm{\&pi;}}{N_1}{s}_{1}k(k+1)},$ k＝0，...，N-1

$g_{3\mathrm{RB}}(k;s_3)=e^{-j\frac{\mathrm{\&pi;}}{N_3}{s}_{3}k(k+1)},$ k＝0，...，3N-1

Here, S ₁And S ₃The index that expression is relatively prime with sequence length (N or 3N).In this example, owing to adopt the cyclic extensions method to generate the sequence of 1RB length, and adopt the sequence of truncated sequence method of formation generation 3RB length so S ₁Can be 1,2 ..., 10, and S ₂Can be 1,2 ..., 36.Simultaneously, N1 can be 11, and N2 can be 37.

Based on this, if 1RB length sequences and 3RB length sequences in initial 12 subcarriers zone of 3RB length sequences crossover occur, then the cross correlation value between two sequences can be expressed as follows:

[formula 10]

$c(d;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{g}_{1\mathrm{RB}}(k;s_1)g_{3\mathrm{RB}}^{*}(k+d;s_3)$

For?d＝0，

$c(0;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\exp (-j\frac{\mathrm{\&pi;}}{N_1}{s}_1\mathrm{mod}(k,N-1)(\mathrm{mod}(k,N-1)+1))\exp \left(j\frac{\mathrm{\&pi;}}{N_3}{s}_{3}k(k+1)\right)$

$=\left[\underset{k=0}{\overset{10}{\mathrm{\&Sigma;}}}\exp \right\{\mathrm{j\&pi;k}(k+1)(\frac{s_3}{37}-\frac{s_1}{11})\left\}\right]+\exp (j\frac{\mathrm{\&pi;}}{37}{s}_3\&CenterDot;11\&CenterDot;12)$

According to formula 10, should be appreciated that, if sequence index (S ₁And S ₃) combination satisfy Near 0 condition, then by the high cross-correlation of sequence generation of these sequence index indications.Therefore, if consider the sequence of 1RB length and the sequence of 3RB length, then advise satisfying

Divide into groups near the combination of the sequence index of 0 condition.

Simultaneously, in order to confirm and the relation of the position that crossover occurs, we consider to occur in second 12 subcarriers zone of 3RB length sequences when the 1RB length sequences situation of crossover.In this case, the cross correlation value of two sequences can be expressed as follows:

[formula 11]

$c(d;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{g}_{1\mathrm{RB}}(k;s_1)g_{3\mathrm{RB}}^{*}(k+12+d;s_3)$

For?d＝0，

$c(0;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\exp (-j\frac{\mathrm{\&pi;}}{N_1}{s}_1\mathrm{mod}(k,N-1)(\mathrm{mod}(k,N-1)+1))\exp \left(j\frac{\mathrm{\&pi;}}{N_3}{s}_3(k+12)(k+13)\right)$

$=\left[\underset{k=0}{\overset{10}{\mathrm{\&Sigma;}}}\exp \right[\mathrm{j\&pi;}\{k(k+1)(\frac{s_3}{37}-\frac{s_1}{11})+\frac{{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2}{37}\&CenterDot;12\&CenterDot;(2k+13)\}\left]\right]+\exp (j\frac{\mathrm{\&pi;}}{37}{s}_3\&CenterDot;23\&CenterDot;24)$

Simultaneously, when the 1RB length sequences in last 12 subcarriers zone of 3RB length sequences crossover occured, cross correlation value can be expressed as follows:

[formula 12]

$c(d;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{g}_{1\mathrm{RB}}(k;s_1)g_{3\mathrm{RB}}^{*}(k+24+d;s_3)$

For?d＝0，

$c(0;s_1,s_3)=\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}\exp (-j\frac{\mathrm{\&pi;}}{N_1}{s}_1\mathrm{mod}(k,N-1)(\mathrm{mod}(k,N-1)+1))\exp \left(j\frac{\mathrm{\&pi;}}{N_3}{s}_3(k+24)(k+25)\right)$

$=\left[\underset{k=0}{\overset{10}{\mathrm{\&Sigma;}}}\exp \right[\mathrm{j\&pi;}\{k(k+1)(\frac{s_3}{37}-\frac{s_1}{11})+\frac{{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2009101690380E00021.png,H2009101690380E00031.png"\; state="\{\{state\}\}">s</figure-callout>}}_2}{37}\&CenterDot;24\&CenterDot;(2k+25)\}\left]\right]+\exp (j\frac{\mathrm{\&pi;}}{37}{s}_3\&CenterDot;35\&CenterDot;36)$

According to formula 11 and formula 12, also can reach a conclusion, if sequence index (S ₁And S ₃) combination satisfy

Near 0 condition, then by the high cross-correlation of sequence generation of these sequence index indications.Therefore, if consider the sequence of 1RB length and the sequence of 3RB length, the position that crossover then occurs does not change a minute set condition.

According to above example, the present invention's suggestion: when considering that length is N ₁And N ₂Two sequences the time, as follows sequence is carried out grouping, that is, two sequence index in being grouped into same group all sequences index satisfy

Near 0 condition.Here, N ₁And N ₂It can be the largest prime number less than the reference signal sequence that generates.Simultaneously, S ₁And S ₂The root index of expression ZC sequence can be respectively at 1～(N ₁-1) and 1～(N ₂-1) selects in the scope.

Based on this concept, we have considered the more general group technology of every kind of length sequences.

Fig. 3 to 5 shows the concept map that sequence is divided into groups according to an embodiment of the invention.

According to this execution mode, in every kind of length sequences such as 1RB, 2RB, 3 RB as shown in Figure 3, the sequence of packets that index can be satisfied above-mentioned high correlation Condition is same group.Simultaneously, can be with the same residential quarter of being assigned to of each sequence set or Node B.

Usually, take the residential quarter or Node B carry out FDM as unit, the minimum interference that therefore can in a residential quarter or Node B, will use the sequence of different length to cause.Therefore, arrive same residential quarter or Node B by the sequence allocation that will have high cross-correlation relation, the intercell interference that the sequence of using different length can be caused.

Simultaneously, another embodiment of the invention proposes by carrying out grouping so that each group comprises the mode of at least one sequence of every kind of length.By such operation, if sequence set is assigned to same residential quarter or Node B, the UE that then can support to be positioned at this residential quarter or Node B adopts the reference signal sequence of every kind of length.But can define by different modes concrete group technology.

At first, distributing to the quantity of the sequence of a group can be proportional with the quantity corresponding to the RB of reference signal sequence length.Among Fig. 3, a sequence of 1RB length sequences, two sequences of 2RB length sequences, three sequences of 3RB length sequences etc. are made up.

Secondly, the quantity that is assigned as one group sequence can be constant.Among Fig. 4, it is same group with a sequence of packets of every kind of RB length sequences.

Equally, present embodiment can be defined as by this way and carry out grouping, that is, be assigned to one group sequence quantity neither with the proportional constant that also do not keep of sequence length.Fig. 5 shows the example of by this way sequence being divided into groups, and is about to two sequences of two sequences, 3RB length sequences of a sequence, the 2RB length sequences of 1RB length sequences and three sequences of 4RB length sequences etc. and is grouped into one group.

With top similar, if each group comprises at least one sequence of every kind of RB length, then can define the maximum quantity of every group sequence.When the maximum quantity of sequence that defined every group, can in the sequence quantitative limits, select the method for the root index of ZC sequence be defined as follows.

If every kind of RB length sequences is selected a sequence, and if for this group selection index be S ₁With length be N ₁A particular sequence, then can every kind RB length select a sequence (have index S ₂), wherein this index is so that (S ₂/ N ₂-S ₁/ N ₁) near 0, N wherein ₂The sequence length corresponding with the RB length of this consideration.Simultaneously, if every specific RB length sequences has been selected two sequences, and if for this group selection index be S ₁With length be N ₁A particular sequence, then can select two sequences so that (S to this RB length ₂/ N ₂-S ₁/ N ₁) near 0.This can further be summarized as the maximal sequence quantity " x " of every kind of RB length.

Equally, another kind of group technology can be defined as follows.If every kind of RB length sequences is selected a sequence, and if for this group selection index be S ₁With length be N ₁A particular sequence, then at first make (S ₂/ N ₂-S ₁/ N ₁) sequence near selection specific quantity (y) in the middle of the sequence of particular value, then, selecting with index from this y sequence is S ₁Sequence have a sequence of high cross-correlation relation.Simultaneously, if every specific RB length sequences is selected two sequences, and if for this group selection index be S ₁With length be N ₁A particular sequence, then at first make (S ₂/ N ₂-S ₁/ N ₁) item near the sequence of selecting specific quantity (y) in the middle of the sequence of particular value, then, from this y sequence, select and index is S ₁Sequence have two sequences of high cross-correlation relation.This can further be summarized as the maximal sequence quantity " x " of every kind of RB length.

In above-mentioned example, at first having selected index is S ₁With length be N ₁A particular sequence, and this particular sequence becomes the benchmark of selecting all the other sequences.This consensus sequence can be defined as the sequence of 1RB length, the sequence of 2RB length, the sequence of 3RB length etc.But in the following description, we suppose that consensus sequence is the sequence of 3RB length.Therefore simultaneously, because the quantity of the sequence index of every 3RB length is 30, the quantity according to the group that sequence is divided into groups of this execution mode of the present invention can be 30.

The quantity of root index of considering the sequence of 3RB length is 30, and the quantity of the root index of selecting for particular group can be determined as follows:

[formula 13]

Round (quantity of the root index of the sequence of specific RB length/30)

Here, " round (z) " is rounded to (round off) near the function of the nearest integer of z.

Through type 13 can be selected a sequence for 3RB length and 4RB.Simultaneously can select two sequences for 5～6RB length.In addition, can select respectively 3 or more sequence for the length greater than 6RB length.Simultaneously, according to an embodiment of the invention, can to length less than the sequence of 3RB length define by different way (such as, do not use the ZC sequence).By such operation, the quantity of the sequence selected for 1RB length and 2RB length can be defined as 1.

In a word, according to present embodiment, the quantity of every group of sequence can be defined as follows

[formula 14]

{1RB，2RB，3RB，4RB，5RB，6RB，8RB，9RB，10RB，12RB，15RB，16RB，18RB，20RB，24RB，25RB，...}＝{1，1，1，1，2，2，3，3，4，5，6，6，7，8，9，9，...}

Based on this, following table 1～5 shows by each group and comprises the example of carrying out sequence of packets according to the mode of the quantity of the sequence of formula 14, and simultaneously, the sequence of every group selection satisfies above-mentioned high cross-correlation relation.

[table 1]

[table 2]

[table 3]

[table 4]

[table 5]

In table 1～5, because defined by different way 1RB length and 2RB length, so the sequence of 1RB length and 2RB length is not shown.

Simultaneously, in other example, consider that the quantity of root index of the sequence of 3RB length is 30, the quantity of the root index that can select for particular group is determined as follows.

[formula 15]

Floor (quantity of the root index of the sequence of specific RB length/30)

Here, floor (z) is the function that obtains being not more than the maximum integer of z.

Through type 15 can be selected a sequence for 3RB～5RB length.Simultaneously can select two sequences for 6～8RB length.In addition, for the length greater than 9RB length, can select respectively 3 or more sequence.Simultaneously, according to an embodiment of the invention, can to length less than the sequence of 3RB length define by different way (such as, do not use the ZC sequence).By such operation, the quantity of the sequence selected for 1RB length and 2RB length can be defined as 1.

In a word, according to present embodiment, the quantity of every group of sequence can be defined as follows:

[formula 16]

{1RB，2RB，3RB，4RB，5RB，6RB，8RB，9RB，10RB，12RB，15RB，16RB，18RB，20RB，24RB，25RB，...}＝{1，1，1，1，1，2，2，3，3，4，5，6，7，7，9，9，...}

Based on this, following table 6～8 shows by each group and comprises the example of carrying out sequence of packets according to the mode of the quantity of the sequence of formula 16, and simultaneously, the sequence of every group selection satisfies above-mentioned high cross-correlation relation.

[table 6]

[table 7]

[table 8]

Similar with table 1～5, in table 6～8, because defined by different way 1RB length and 2RB length, so the sequence of 1RB length and 2RB length is not shown.

In other execution mode of the present invention, because a variety of causes can pre-determine the maximum quantity of every group sequence.Following table 9 and 10 shows the example when the maximum quantity with every group sequence is restricted to 5 sequences.

[table 9]

[table 10]

Simultaneously, in other example, the maximum quantity of sequence can be pre-determined is 4.Following table 11 and 12 shows this situation.

[table 11]

[table 12]

Simultaneously, in other example, the maximum quantity of sequence can be pre-determined is 3.Following table 13 and 14 shows this situation.

[table 13]

[table 14]

Simultaneously, in other example, the maximum quantity of sequence can be pre-determined is 2.Following table 15 and 16 shows this situation.

[table 15]

[table 16]

Simultaneously, in other example, the maximum quantity of sequence can be pre-determined is 1.Following table 17 shows this situation.

[table 17]

Consider the complexity of structure and support UE to use the flexibility of the reference signal sequence of variable-length, an embodiment of the invention propose to carry out as follows the example of grouping, namely each group comprise corresponding with every kind of length in 1 to a 5RB length basic sequence and with 6RB or corresponding two basic sequences of every kind of length in the big-length more.This is corresponding to table 15 and table 16.

Here, basic sequence means that it is employed the cyclic shift corresponding with various cyclic shift value by the ZC sequence of root index indication.The basic sequence of simultaneously, having carried out cyclic shift can be used as reference signal sequence.

Upper table 1～17th is when utilizing (S ₁/ N ₁-S ₂/ N ₂) situation when selecting (a plurality of) root index.But in other execution mode of the present invention, can select the root index by the cross correlation value computing of reality.Under table 18～20 corresponding to table 6～8, difference is to select the root index by the cross correlation value computing of reality.

[table 18]

[table 19]

[table 20]

In this case, be 5 if the maximum quantity of the sequence of each group is pre-determined, then can shown in following table 21 and 22, carry out grouping.Table 21 and 22 also is the situation of selecting basic sequence by the computing cross-correlation of reality.

[table 21]

[table 22]

In other example, be 4 if the maximum quantity of the sequence of each group is pre-determined, then can shown in following table 23 and 24, carry out grouping.Table 23 and 24 also is the situation of selecting basic sequence by the computing cross-correlation of reality.

[table 23]

[table 24]

In other example, be 3 if the maximum quantity of the sequence of each group is pre-determined, then can shown in following table 25 and 26, carry out grouping.Table 25 and 26 also is the situation of selecting basic sequence by the computing cross-correlation of reality.

[table 25]

[table 26]

In other example, be 2 if the maximum quantity of the sequence of each group is pre-determined, then can as shown in table 27 belowly carry out grouping.Table 27 also is the situation of selecting basic sequence by the computing cross-correlation of reality.

[table 27]

In other example, be 1 if the maximum quantity of the sequence of each group is pre-determined, then can as shown in table 28 belowly carry out grouping.Table 28 also is the situation of selecting basic sequence by the computing cross-correlation of reality.

[table 28]

For above-mentioned situation, can come his-and-hers watches to recombinate according to the quantity of the sequence of every group and every kind length allocation.

For other example of the present invention, above each table can be expanded to the length of 100RB, following table shows this example.In this example, be set to 1 with 5RB length or less than the maximum quantity (v) of the root index number of 5RB length, the maximum quantity (v) of root index number that simultaneously will be longer than 5RB length is set to 2.

[table 29]

[table 30]

[table 31]

[table 32]

Based on these concepts, the invention provides the following method of utilizing ZC sequence generating reference signal sequence.

For the generating reference signal sequence, an embodiment of the invention have defined the specific basic sequence that is used to the application cycle displacement.In this execution mode, utilize the ZC sequence with specific root index (after this, being called " q ") to define basic sequence.Simultaneously, select specific basic sequence from basic sequence set, each basic sequence set comprises the basic sequence with above-mentioned high cross-correlation relation.Therefore, if plan to select to have the specific basic sequence of index " q ", should consider that then the basic sequence number index (after this, being called " v ") in group index (after this, being called " u ") and each group is selected " q ".That is to say, " q " should be the function of " u " and " v ".

Simultaneously, after having selected to have the specific basic sequence of root index " q ", then can use the cyclic shift corresponding with various cyclic shift value to selected basic sequence.

If more specifically consider the relation between " q ", " u " and " v ", then can obtain by following formula " q ".Following formula 17 and formula 18 are used for selecting index " q " to satisfy (S ₁/ N ₁-S ₂/ N ₂) close to 0 condition.

[formula 17]

$q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

[formula 18]

$q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

Here, N _ZC ^RSTo generate length for the target ZC sequence that generates q ZC root sequence (root ZC sequence), by specifying N less than the largest prime number of corresponding reference signal sequence size _ZC ^RSThat is to say, come the formation base sequence by the cyclic extensions method.

Simultaneously, N _{Reference, ZC} ^RSBy the length (for example, 3RB length) less than the largest prime number appointment of reference sequences size.If divide into groups based on 3RB length, then N _{Reference, ZC} ^RS31." round (z) " is the function that is rounded near the nearest integer of z.Floor (z) is the function that obtains being not more than the maximum integer of z.

Simultaneously, according to another embodiment of the present invention, if generate the ZC sequence based on truncation method, then can be by specifying N greater than the minimum prime number of corresponding reference signal sequence size _ZC ^RSAnd, in this case, N _{Reference, ZC} ^RSCan be by the length (for example, 3RB length) greater than the minimum prime number appointment of reference sequences size.If divide into groups based on 3RB length, then N _{Reference, ZC} ^RS37.

Simultaneously, according to " m " individual element (x of the individual ZC sequence of formula 17 and 18, the " q " _q(m)) can be expressed as follows:

[formula 19]

$x_q\left(m\right)=e^{-j\frac{\mathrm{\&pi;qm}(m+1)}{N_{\mathrm{ZC}}^{\mathrm{RS}}}},0\&le;m\&le;N_{\mathrm{ZC}}^{\mathrm{RS}}-1$

Because " round (y) " in fact equates with " floor (y+0.5) ", so formula 17 and 18 has identical implication.In formula 17 and 18, (1) ^{Floor (round (y)-y)}If an expression " y " is 0.5 or larger value at its decimal place place, then can be with (1) ^{Floor (round (y)-y)}Be calculated as " 1 ", and if " y " is the value less than 0.5 at its decimal place place, then can be with (1) ^{Foor (round (y)-y)}Be calculated as " 1 ".Therefore, can use (1) ^{Floor (y-round (y))+1}Any other equivalence item that perhaps has identical meanings replaces (1) ^{Floor (round (y)-y)}

In above-mentioned example, when based on 3RB length when carrying out grouping greater than the length of 3RB length, simultaneously when generating the ZC sequence based on the cyclic extensions method, N _{Reference, ZC} ^RSCan be 31.Equally, when generating the ZC sequence based on truncation method, N _{Reference, ZC} ^RSCan be 37.Equally, when based on 4RB length when carrying out grouping greater than the length of 4RB length, simultaneously when generating the ZC sequence based on the cyclic extensions method, N _{Reference, ZC} ^RSCan be 47.Equally, when generating the ZC sequence based on truncation method, N _{Reference, ZC} ^RSCan be 49.And, can easily this method be applied to other based on the grouping of length.

Can through type 17 and formula 18 obtain above-mentioned table.Following example is the part according to formula 17 and formula 18 selection root index.

At first, if N _{Reference, ZC}=31, then when 1) N _Zc=47,2) N _Zc=71,3) N _Zc, select the method for first group (" u "=0) as follows at=211 o'clock.In following example, used formula 18.

1)N _{reference，ZC}＝31， $N_{\mathrm{ZC}}^{\mathrm{RS}}=47,$ U＝0，V＝0；y＝47/31，

Therefore, for 4RB length, the first foundation sequence number (v=0) in first group (u=0) is 2 (q=2).

2)N _{reference，ZC}＝31， $N_{\mathrm{ZC}}^{\mathrm{RS}}=71,$ U＝0，V＝0；y＝71/31，

Therefore, for 6RB length, the first foundation sequence number (v=0) in first group (u=0) is 2 (q=2).

3)N _{reference，ZC}＝31， $N_{\mathrm{ZC}}^{\mathrm{RS}}=211,$ U＝0，V＝0；y＝211/31，

Therefore, for 18RB length, the first foundation sequence number (v=0) in first group (u=0) is 7 (q=7).

For above-mentioned situation, selected index (q) is corresponding to the data that generate based on 3RB length in table 6～8.

In other example, if N _{Reference, ZC}=47 (based on the 4RB length) are then when 1) N _Zc=59,2) N _Zc=107,3) N _Zc, be used for selecting the method for second group (" u "=1) as follows at=139 o'clock.In following example, used formula 18.

1)N _{reference，ZC}＝47， $N_{\mathrm{ZC}}^{\mathrm{RS}}=59,$ U＝1，V＝0；y＝59/47*2，

Therefore, for 5RB length, the first foundation sequence number (v=0) in second group (u=1) is 3 (q=3).

2)N _{reference，ZC}＝47， $N_{\mathrm{ZC}}^{\mathrm{RS}}=107,$ U＝1，V＝0；y＝107/47*2，

Therefore, for 9RB length, the first foundation sequence number (v=0) in second group (u=1) is 5 (q=5).

3)N _{reference，ZC}＝47， $N_{\mathrm{ZC}}^{\mathrm{RS}}=139,$ U＝1，V＝0；y＝139/47*2，

Therefore, for 12RB length, the first foundation sequence number (v=0) in second group (u=1) is 6 (q=6).

In other execution mode of the present invention, can replace formula 17 and formula 18 as follows.

[formula 20]

$q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

[formula 21]

$q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

Because " round (y) " is in fact equal with " floor (y+0.5) ", therefore, formula 20 has identical implication with formula 21.

In other execution mode of the present invention, can replace formula 17 and formula 18 as follows.

[formula 22]

$q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein $y=\mathrm{round}\left(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}\right)\&CenterDot;(u+1),u\&Element;\{\mathrm{0,1},...,29\},$ $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

[formula 23]

$q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein $y=\mathrm{floor}(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}+0.5)\&CenterDot;(u+1),u\&Element;\{\mathrm{0,1},...,29\},$ $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

These formulas are corresponding to the various group technologies that describe for above-mentioned table.

If can be grouped in that the maximum quantity of one group sequence pre-determines is 2, then can simplify respectively formula 17-18, formula 20-21 and formula 22-23 as follows.

[formula 24]

q＝round(y)+v·(-1) ^floor(2y)

Wherein $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},$ u∈{0，1，...，29}，v?∈{0，1}

[formula 25]

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},$ u∈{0，1，...，29}，v?∈{0，1}

[formula 26]

q＝round(y)+v·(-1) ^floor(2y)

Wherein $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},$ u∈{0，1，...，29}，v∈{0，1}

[formula 27]

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein $y=\frac{(N_{\mathrm{zc}}^{\mathrm{RS}}-1)\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}-1},$ u∈{0，1，...，29}，v∈{0，1}

[formula 28]

q＝round(y)+v·(-1) ^floor(2y)

Wherein $y=\mathrm{round}\left(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}\right)\&CenterDot;(u+1),$ u∈{0，1，...，29}，v∈{0，1}

[formula 29]

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein $y=\mathrm{floor}(\frac{N_{\mathrm{zc}}^{\mathrm{RS}}}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}+0.5)\&CenterDot;(u+1),$ u∈{0，1，...，29}，v∈{0，1}

Formula 17-18, formula 20-21 and formula 22-23 are used for selecting to satisfy (S ₁/ N ₁-S ₂/ N ₂) a ZC root index close to 0 condition.And formula 24-29 selects ZC root index for being restricted at the maximum quantity with every group of sequence of every kind of length in 2 the situation.

But, if we further conclude these formulas so that (S ₁/ N ₁-S ₂/ N ₂) close to particular value (T), then can obtain following formula.In this case, value " T " can be 0,1/2 ,-1/2,1/3 ,-1/3.Value " T " can have other value in addition.

In the formula below, formula 30 and formula 31 are used for can having selection ZC root index in the peaked situation at the maximum quantity of every group of sequence of every kind of length.And formula 32 and formula 33 is used for maximum quantity in every group of sequence of every kind of length and is restricted in 2 the situation and selects ZC root index.

[formula 30]

$q=\mathrm{round}\left(y\right)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{round}\left(y\right)-y)+v}$

Wherein $y=N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(T+\frac{(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}),$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

[formula 31]

$q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein $y=N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(T+\frac{(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}),$ u∈{0，1，...，29}， $v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

[formula 32]

q＝round(y)+v·(-1) ^floor(2y)

Wherein $y=N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(T+\frac{(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}),$ u∈{0，1，...，29}，v∈{0，1}

[formula 33]

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein $y=N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(T+\frac{(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}}),$ u∈{0，1，...，29}，v∈{0，1}

It should be apparent to those skilled in the art that in the situation that do not break away from spirit of the present invention and inner characteristic can be realized the present invention according to other specific mode.Therefore, above-mentioned execution mode all is regarded as illustrative rather than restrictive in every respect.Scope of the present invention should be determined by the reasonable explanation of claims, falls into simultaneously the interior all modifications of equivalent scope of the present invention and all comprises within the scope of the invention.

[industrial Applicability A]

The minimum interference of the minizone that the sequence of using variable-length can be brought according to the embodiment of the present invention.Simultaneously, if give specific residential quarter or Node B with each packet by packet basis sequence allocation, then UE can be used as reference signal with the sequence of variable-length.

These methods are applicable to 3GPP LTE (3rd Generation Partnership Project LongTerm Evolution: third generation partner program Long Term Evolution) in the system.But those skilled in the art can easily understand, and these methods can be applied to the sequence of variable-length is used as any wireless communication system of reference signal sequence.

Claims (3)

1. method that sends reference signal sequence, the method may further comprise the steps:

The ZadoFF-Chu ZC sequence that utilization has a q root index obtains a basic sequence in a plurality of basic sequences;

Obtain reference signal sequence by described basic sequence is carried out cyclic shift, wherein said cyclic shift is corresponding to the cyclic shift value with variate-value; And

The reference signal sequence that obtains is sent to the recipient,

Wherein said a plurality of basic sequence formation sequence group, and " q " provided by the group index u of described sequence set and the function of the basic sequence number index v in the sequence set in the described sequence set,

Wherein determine q by following formula,

$q=\mathrm{floor}(y+0.5)+\mathrm{floor}\left(\frac{v+1}{2}\right)\&CenterDot;{(-1)}^{\mathrm{floor}(\mathrm{floor}(y+0.5)-y)+v}$

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},u\&Element;\{\mathrm{0,1},...,29\},v\&Element;\{\mathrm{0,1},...,\mathrm{floor}(N_{\mathrm{ZC}}^{\mathrm{RS}}/30)-1\}$

Wherein,

To have the ZC sequence of using in the Zadoff-Chu ZC sequence of q root index in generation to generate length,

The largest prime number that has the length of the basic sequence that the Zadoff-Chu ZC sequence of q root index obtains less than utilization,

Be specific benchmark prime number, and floor (z) is the function that generates the maximum integer that is not more than z.

2. method according to claim 1, wherein, the maximum number of the basic sequence in each sequence set is 2, and

Wherein, determine described " q " by following formula

q＝floor(y+0.5)+v·(-1) ^floor(2y)

Wherein, $y=\frac{N_{\mathrm{zc}}^{\mathrm{RS}}\&CenterDot;(u+1)}{N_{\mathrm{reference},\mathrm{zc}}^{\mathrm{RS}}},u\&Element;\{\mathrm{0,1},...,29\},v\&Element;\left\{\mathrm{0,1}\right\}.$

3. method according to claim 1, wherein, described specific benchmark prime number is 31.

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