CN101515809A - Method and device for reducing reference signal CM in carrier wave polymerization scene - Google Patents

Abstract

The invention discloses a method and device for reducing reference signal CM in carrier wave polymerization scene. The method includes steps of generating long sequence according to LTE-A system carrier wave configure and cell specific descending reference signal sequence in LTE Release 8, grouping the generated long sequence, and distributing the long sequence according to cell carrier wave property to reduce base station terminal CM. The technical solution provided by the present invention can reduce CM of transmitting terminal at the premise of not changing the LTE standard basically, thereby reducing power consumption of device.

Description

Reduce the method and apparatus of reference signal CM in the carrier aggregation scene

Technical field

The present invention relates to wireless communication field, (Long TermEvolution Advanced LTE-A) reduces reference signal cubic measure (Cubic Metric, method and apparatus CM) in the carrier aggregation scene in the system to relate in particular to a kind of senior Long Term Evolution.

Background technology

In radio communication, the nonlinear distortion of high power amplifier (HPA) and peak amplitude restriction can cause imbalance (Inter-modulation) effect between the carrier wave and introduce extra interference in system.In order to prevent and treat this negative effect, just should make power amplifier be operated in its range of linearity.Usually, wireless communication terminal can not dispose a power amplifier that the very big range of linearity is arranged in order to save device cost.In this case, if the bigger signal of amplitude is carried out peak clipping (Clipping), will produce interference to inband signaling and neighboring trace signal.If improve the linear characteristic of power amplifier, then can reduce the power efficiency of power amplifier by " rollback ".

Peak-to-average power is than (peak-to-average power ratio PAPR) is measurement method relatively more commonly used traditionally, the main amplitude peak of transmission signal and the ratio between the mean value of characterizing.The tradition multi-transceiver technology, (Orthogonal Furequency Division Multiplexity, OFDM), its signal is formed by stacking by the signal with different carrier frequency of a large amount of separate modulation, has very big PAPR as OFDM.Under the extreme case, if N the signal stack with same phase, the amplitude of the peak value that is produced is N a times of average signal amplitude.Therefore, the transmission technology with high PAPR can reduce the power efficiency of radio-frequency (RF) power amplification, and requires the transmitter power amplifier that a very big range of linearity is arranged, thereby improves the complexity of D/A and A/D converter greatly, increases the cost of terminal.Adopt the PAPR under 99.9% probability to weigh transmission technology indirectly to the power amplifier effect of nonlinear traditionally morely.

But in fact, CM is than PAPR measure more accurately.CM directly characterizes the reduction of power amplifier power efficiency, or is called power degeneration (Power De-Rating).In amplifier circuit, the cube nonlinear component of gain amplifier is the main cause that produces channel ACLR (ACLR).As shown in the formula:

v ₀(t)＝G ₁v _I(t)+G ₃[v _I(t)] ³

Power amplifier output signal v ₀(t) constitute by two: one and v _I(t) be directly proportional, just linear component; One and v _ICube being directly proportional (t), just nonlinear component.This cube item is to cause channel distortion, triple-frequency harmonics, thereby causes the reason of interior interference of band and monkey chatter.Therefore with CM value directly this cube of measurement item be, accurately balancing method more direct than PAPR.

Because the structure of weighing with PAPR and CM also not exclusively is directly proportional, some technology has obvious effects to the reduction of PAPR, but undesirable to the reduction of CM, and LTE determines that finally CM is the accurate way of measurement power amplifier power efficiency.

In 3GPP LTE-A system, when the spectrum aggregating technology is adopted in up-downgoing, if descending all polymerization carrier wave (Component Carrier, CC) all use same cells identification number (Cell ID), the descending carrier of each polymerization will produce identical downlink reference signal (RS) pattern so, use at transmitting terminal under the situation of a power amplifier and radio frequency, the repeatability of downlink reference signal on frequency domain, to cause using the value of the CM of spectrum aggregating technology to be compared with the CM value of not using the spectrum aggregating technology, very big increase has been arranged, will bring great burden to the power amplifier (Power Amplifier) of base station end like this.

The company that has proposes the different Cell Identity CI (Cell ID) of each descending carrier use in 3GPP LTE-A system.Because each descending carrier uses the different districts identification number, the sequence of the downlink reference signal of generation is also different thereupon, and therefore, the problem that CM raises can be too not serious.But this method also can be brought some problems, and for example under the situation of the asymmetric polymerization of up-downgoing, the sequence that can have influence on PUCCH generates, and the PUCCH that causes a plurality of user to produce has nothing in common with each other, and the orthogonality of PUCCH sequence is destroyed between the user.In addition, use different Cell Identity CIs also can bring some troubles to plot planning.

Company of Texas Instrument (TI) proposes, need on different carrier waves, not broadcast different Physical Cell Identifier number (Cell ID), the problem of CM rising simultaneously can be by simple method, and just different descending carriers use the method for different phase place rotations to solve.In motion, TI has lifted a simple example, and emulation has illustrated the benefit of its scheme.Concrete scheme is as follows:

● when there are 5 descending carriers the sub-district: have only the 4th carrier wave to carry out phasing back.

● when there are 4 descending carriers the sub-district: have only the 4th carrier wave to carry out phasing back.

● when there are 3 descending carriers the sub-district: have only the 3rd carrier wave to carry out phasing back.

● when there are 2 descending carriers the sub-district: do not have carrier wave to carry out phasing back.

● when there is 1 descending carrier the sub-district: do not have carrier wave to carry out phasing back.

But the shortcoming of the scheme of TI is the phase place rotation information need inform the LTE-Advanced user terminal by the base station end, and this information is transparent to LTE Release 8 users.Therefore TI proposes, and the user of LTE Release 8 does not insert the descending carrier of phasing back, has so just limited the access of LTE Release 8, and the CM value of the scheme of TI is still than higher.

Summary of the invention

When the technical problem to be solved in the present invention overcomes in the LTE-A system a plurality of carrier wave of cell configuration exactly, because each the polymerization carrier wave under same power amplifier generates identical reference signal sequence according to Cell Identity CI, and then cause the problem of the increase of equipment CM, propose to reduce in the carrier aggregation scene method and apparatus of reference signal CM value, can not change substantially under the prerequisite of LTE standard, reduce the CM of transmitting terminal, thereby reduce the power consumption of equipment.

In order to solve the problems of the technologies described above, the invention provides the method that reduces reference signal cubic measure CM in a kind of carrier aggregation scene, be applied to advanced long-term evolution system, comprising:

The base station generates a long sequence according to following formula:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

The base station is divided into the short sequence of K group with described long sequence, and selects wherein one group short sequence as the reference signal sequence that the descending carrier of backward compatibility uses, and selects wherein one or more groups short sequence as the reference signal sequence of non-backward compatible carrier waves use.

Further, said method also can have following characteristics:

Described K=2, the long sequence that the base station generates is:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The base station is divided into 2 groups short sequences with described long sequence, and selects short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all non-backward compatibles.

Further, said method also can have following characteristics:

Described K=N _{Non_Max}+ 1, N _{Non_Max}Be the maximum number of the descending carrier of non-backward compatible, the long sequence that the base station generates is:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The base station is divided into N with described long sequence _{Non_Max}+ 1 group short sequence, and select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility;

Base station selected N _{Non_Max}Remove short sequence S in+1 group short sequence ₁The reference signal sequence that the short sequence of in addition other is used as the descending carrier of each non-backward compatible respectively, the descending carrier of each backward compatibility corresponding one short sequence.

Further, said method also can have following characteristics:

The base station is according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{Non_Max}The reference signal sequence that+1 group short sequence is used as the descending carrier of non-backward compatible.

Further, said method also can have following characteristics:

Described base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier;

Terminal adopts the corresponding reference signal sequence to detect according to the attribute of the descending carrier that uses;

The attribute of described descending carrier is meant: described descending carrier is backward compatibility or non-backward compatible.

In order to solve the problems of the technologies described above, the present invention also provides the device that reduces reference signal CM in a kind of carrier aggregation scene, is applied to the base station of advanced long-term evolution system, comprising: the generation module of Xiang Lianing, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use.

Further, said apparatus also can have following characteristics:

Described generation module is used to generate following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is used for described long sequence is divided into 2 groups short sequences;

Described selection module is used to select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all non-backward compatibles.

Further, said apparatus also can have following characteristics:

Described generation module is used to generate following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

N wherein _{Non_Max}Maximum number for the descending carrier of non-backward compatible;

Described grouping module is used for described long sequence is divided into N _{Non_Max}+ 1 group short sequence;

Described selection module is used to select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility;

Described selection module is used to select N _{Non_Max}Remove short sequence S in+1 group short sequence ₁The reference signal sequence that the short sequence of in addition other is used as the descending carrier of each non-backward compatible respectively, the descending carrier of each backward compatibility corresponding one short sequence.

Further, said apparatus also can have following characteristics:

Described selection module also is used for the order according to the carrier frequency point height, and selective sequential the 2nd is to N _{Non_Max}The reference signal sequence that+1 group short sequence is used as the descending carrier of non-backward compatible.

In order to solve the problems of the technologies described above, the present invention also provides the device that reduces reference signal CM in a kind of carrier aggregation scene, be applied to the base station and the terminal of advanced long-term evolution system, described base station comprises generation module, grouping module and the selection module that links to each other successively, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use;

Described detection module is used for according to the corresponding relation of the reference signal sequence of appointing with the base station with the attribute of descending carrier, and the attribute of the descending carrier that uses, and employing corresponding reference signal sequence detects.

The present invention is in carrier aggregation scene, generate long sequence according to the specific downlink reference signal sequence formula in sub-district among configuration of LTE-A system carrier and the LTE Release 8, and a long sequence that generates divided into groups, distribute according to the cell carrier attribute, and then reduction base station end CM.Adopt technical scheme of the present invention, can not change substantially under the prerequisite of LTE standard, reduce the CM of transmitting terminal, thereby reduce the power consumption of equipment.

Description of drawings

Fig. 1 is the flow chart of the embodiment of the invention one;

Fig. 2 is the flow chart of the embodiment of the invention two;

Fig. 3 is the device block diagram of the embodiment of the invention.

Embodiment

In the present invention, the base station generates formula according to LTE Release 8 descending cell specific reference signal sequences and generates a long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1,

Be the long sequence that generates, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe time slot (Slot) label in radio frames in the LTE frame structure, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence, with the definition among the 3GPP TR36.211;

The base station is divided into the short sequence of K group with described long sequence, and selects wherein one group short sequence as the reference signal sequence that the descending carrier of backward compatibility uses, and selects wherein one or more groups short sequence as the reference signal sequence of non-backward compatible carrier waves use.

The present invention is described in detail below in conjunction with drawings and the specific embodiments.

Embodiment one (scheme 1)

For example, LTE-A cell downlink configuration carrier wave number is N _Total, wherein the non-backward compatible carrier waves number is N _Non, then backward compatibility carrier wave number is N _Total-N _Non, N wherein _Total-N _Non＞0.

As shown in Figure 1, the embodiment of the invention comprises the steps:

Step 101 serves as that the basis produces long sequence with the sequence generating mode among the LTE Release 8 at first, but different with LTE Release 8 be that we have changed the m length in the formula (1):

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(1\right)$

As shown in Equation (2), we make the extended length of m to 4N _RB ^{Max, DL}, i.e. K=2.

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(2\right)$

Step 102 after long sequence generates, is divided into two groups to the long sequence that generates;

Step 103, base station down when emission, select reference signal sequence: the descending carrier of backward compatibility then uses first group in the sequence that formula (2) produces, just the same with formula (1) downlink reference signal sequence S ₁, so just can guarantee that LTE Release 8 terminals can detect the downlink reference signal on the backward compatibility carrier wave; And the non-backward compatible carrier wave uses the 2nd group of sequence that formula (2) produces, i.e. sequence S shown in the formula (3) ₂

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(3\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier, sequence information are stored in the reference signal sequence memory of base station end and LTE-A terminal respectively.

Terminal is according to the attribute of the descending carrier that uses, and promptly descending carrier is backward compatibility or non-backward compatible, adopts the corresponding reference signal sequence to detect.For example, then use in the sequence that formula (2) produces the 1st group, just the same downlink reference signal sequence S when the descending carrier that has used backward compatibility with formula (1) ₁Detect; When using non-backward compatible carrier waves, then use sequence that formula (2) produces the 2nd group, i.e. sequence S shown in the formula (3) ₂Carry out the detection of reference signal.

Embodiment two (scheme 2)

For example, as certain LTE-A cell downlink configuration N _TotalDuring individual carrier wave, N wherein _NonBe the non-backward compatible carrier waves number of this LTE-A cell downlink configuration, N _{Non_Max}Be the maximum number of non-backward compatible carrier waves in the LTE-A system, and N _{Non_Max}〉=N _Non, so the backward compatibility carrier number of this LTE-A cell configuration is N _Total-N _Non, and N _Total-N _Non＞0.

As shown in Figure 2, the embodiment of the invention comprises the steps:

Step 201 serves as that the basis produces long sequence with the sequence generating mode among the LTE Release 8 at first, but different with LTE Release 8 be that we have changed the m length in the formula (1):

As shown in Equation (4), we make extended length to the 2 (N of m _{Non_Max}+ 1) N _RB ^{Max, DL}, i.e. K=N _{Non_Max}+ 1:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(4\right)$

Step 202 after long sequence generates, is divided into N to long sequence in order _{Non_Max}+ 1 group;

Step 203, in the LTE-A sub-district, during the base station down emission, select reference signal sequence: the carrier wave of backward compatibility uses first group in the sequence that formula (4) produces, just the same with formula (1) downlink reference signal sequence so just can guarantee that LTE Release 8 terminals can detect the downlink reference signal on the backward compatibility carrier wave; And N _{Non_Max}Individual non-backward compatible carrier waves is according to the carrier frequency point height, and the back the 2nd of the sequence that the formula that uses in order (4) produces is to N _Non+ 1 part of sequence, i.e. sequence shown in the formula (5) (6) (7).

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(5\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$S_3=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(6\right)$

$m=4N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{4N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,6N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$\·\·\·$

$S_{N_{\mathrm{Non}}+1}{r}_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(7\right)$

$m=2N_{\mathrm{Non}}{N}_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{Non}}{N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,2(N_{\mathrm{Non}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier, sequence information are stored in the reference signal sequence memory of base station end and LTE-A terminal respectively.

Terminal is according to the attribute of the descending carrier that uses, and promptly descending carrier is backward compatibility or non-backward compatible, adopts the corresponding reference signal sequence to detect.If what use is the backward compatibility carrier wave, then use the downlink reference signal sequence the same to detect with formula (1), if what use is the non-backward compatible carrier wave, then according to this carrier wave carrier frequency point order or other mapping relations in non-backward compatible carrier waves, select corresponding reference signal sequence to detect, for example the carrier frequency point of certain non-backward compatible carrier waves is arranged i according to from high to low order, then selects S _I+1

As shown in Figure 3, the device of the embodiment of the invention is applied to the base station of advanced long-term evolution system, comprising: the generation module of Xiang Lianing, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use.

Specifically, corresponding scheme 1,

Described generation module is used to generate following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is used for described long sequence is divided into 2 groups short sequences;

Described selection module is used to select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all non-backward compatibles.

Corresponding scheme 2,

Described generation module is used to generate following long sequence:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is used for described long sequence is divided into N _{Non_Max}+ 1 group short sequence;

Described selection module is used to select short sequence S ₁:

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility;

Described selection module is used to select N _{Non_Max}Remove short sequence S in+1 group short sequence ₁The reference signal sequence that the short sequence of in addition other is used as the descending carrier of each non-backward compatible respectively, the descending carrier of each backward compatibility corresponding one short sequence.

Described selection module also is used for the order according to the carrier frequency point height, and selective sequential the 2nd is to N _{Non_Max}The reference signal sequence that+1 group short sequence is used as the descending carrier of non-backward compatible.

The device of the embodiment of the invention is applied to the base station and the terminal of advanced long-term evolution system, and described base station comprises generation module, grouping module and the selection module that links to each other successively, and described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use;

Described detection module is used for according to the corresponding relation of the reference signal sequence of appointing with the base station with the attribute of descending carrier, and the attribute of the descending carrier that uses, and employing corresponding reference signal sequence detects.

For the ease of understanding the present invention, the present invention is further set forth below in conjunction with concrete application example.

Suppose that the LTE-A cell downlink has 4 carrier waves, CC ₁, CC ₂, CC ₃And CC ₄CC wherein ₁And CC ₂Be backward compatibility carrier wave, CC ₃And CC ₄Be non-backward compatible carrier waves, and in this LTE-A system, the non-backward compatible carrier waves number that single subdistrict is maximum is 2.

It is as follows that scheme 1 is used example:

At first generate formula according to the descending specific reference signals sequence among the LTE Release 8 and produce long sequence, long sequence is seen formula (8).

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(8\right)$

Reference signal sequence generating unit in Fig. 1 is divided into two groups to long sequence then, is designated as S ₁And S ₂

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(9\right)$

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(10\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Two groups of sequences are deposited in the reference signal sequence memory of base station end and terminal.

During base station end downlink, select the corresponding reference signal sequence, CC ₁And CC ₂Select the S in the reference signal sequence memory ₁, CC ₃And CC ₄Select the S in the reference signal sequence memory ₂

The LTE-A terminal selects suitable reference sequences to detect according to the attribute of employed descending carrier.When using CC ₁Perhaps CC ₂The time, then control part is selected reference signal sequence S ₁Detect; When using CC ₃Perhaps CC ₄The time, then control part is selected reference signal sequence S ₂Carry out the detection of reference signal.

It is as follows that scheme 2 is used example:

At first generate formula according to the descending specific reference signals sequence among the LTE Release 8 and produce long sequence, long sequence is seen formula (8).

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2\×(2+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(11\right)$

Reference signal sequence generating unit in Fig. 1 is divided into three groups to long sequence then, is designated as S ₁, S ₂And S ₃

$S_1=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(12\right)$

$S_2=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),---\left(13\right)$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

$S_3=r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=4N_{\mathrm{RB}}^{\max ,\mathrm{DL}},{4N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,6N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(14\right)$

Three groups of sequences are deposited in the reference signal sequence memory of base station end and terminal.

During base station end downlink, select the corresponding reference signal sequence, CC ₁And CC ₂Select the S in the reference signal sequence memory ₁, CC ₃Select the S in the reference signal sequence memory ₂, CC ₄Select the S in the reference signal sequence memory ₃

The LTE-A terminal selects suitable reference sequences to detect according to the attribute of employed descending carrier.When using CC ₁Perhaps CC ₂The time, then control part is selected reference signal sequence S ₁Detect; When using CC ₃The time, then control part is selected reference signal sequence S ₂Carry out the detection of reference signal, when using CC ₄The time, then control part is selected reference signal sequence S ₃Carry out the detection of reference signal.

We have carried out the CM emulation experiment, and simulating scenes is the transmission of downlink reference signal in the LTE-A system, and simulation parameter sees Table 1.

Table 1 simulation parameter

Annotate: for justice compares, when the situation of imitative 1 non-backward compatible carrier waves, when the cell downlink carrier wave was two, we also reversed to one of them descending carrier when the scheme of imitative TI.When the situation of imitative 2 non-backward compatible carrier waves, the scheme that we suppose TI is reversed for 2 descending carriers wherein.The scene of the non-backward compatible carrier waves more than 3 may occur in the LTE-A system hardly, has therefore omitted the emulation of this kind scene at this.

Table 2 has only the situation of reference signal

N CC(carrier number)	1	2	3	4	5
						Basic scheme	3.24	6.49	8.40	9.75	10.50
The scheme of TI (1 non-backward compatible	N/A	6.41	4.30	3.22	4.30

Carrier wave)
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.25	4.01	5.97	7.67
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.25	4.01	5.97	7.67
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	4.30	6.49	6.31
Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	4.18	4.94	5.88
						Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	2.92	3.62	4.75

Table 3 data+reference signal (0dB)

N CC(carrier number)

1

2

3

4

5

Basic scheme	3.37	3.44	3.50	3.56	3.63
						The scheme of TI (1 non-backward compatible carrier waves)	N/A	3.43	3.39	3.38	3.39
Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.38	3.39	3.42	3.47
						Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.38	3.39	3.42	3.47
The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.39	3.44	3.43
						Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.39	3.41	3.43
Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	3.38	3.38	3.40

Table 4 data+reference signal (3dB)

N CC(carrier number)	1	2	3	4	5
						Basic scheme	3.40	3.64	3.87	4.11	4.35
The scheme of TI (1 non-backward compatible carrier waves)	N/A	3.62	3.46	3.42	3.46
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.42	3.46	3.59	3.75
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.42	3.46	3.59	3.75
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.46	3.64	3.60
Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.46	3.53	3.60

Scheme 2 (2 non-backward compatible carrier waves)

N/A

N/A

3.41

3.43

3.49

Table 5 data+reference signal (6dB)

N CC(carrier number)	1	2	3	4	5
						Basic scheme	3.64	4.36	5.02	5.64	6.21
The scheme of TI (1 non-backward compatible carrier waves)	N/A	4.33	3.82	3.66	3.79
						Scheme 1 (1 non-backward compatible carrier waves)	N/A	3.67	3.82	4.23	4.75
Scheme 2 (1 non-backward compatible carrier waves)	N/A	3.67	3.82	4.23	4.75
						The scheme of TI (2 non-backward compatible carrier waves)	N/A	N/A	3.81	4.35	4.25

Scheme 1 (2 non-backward compatible carrier waves)	N/A	N/A	3.85	4.03	4.26
						Scheme 2 (2 non-backward compatible carrier waves)	N/A	N/A	3.63	3.72	3.92

Wherein, basic scheme refers to traditional each polymerization carrier wave under same power amplifier generates identical reference signal sequence according to Cell Identity CI scheme.

We can obtain to draw a conclusion from table 2 to table 5:

When the LTE-A sub-district only disposed a non-backward compatible carrier waves, comparing in the CM value of cell configuration when being descending 2 and 3 carrier waves of our scheme 1 and TI was low, but wanted height in the CM value of cell configuration when being descending 4,5 carrier waves.Compare with basic scheme, all lower in any situation CM value.When two non-backward compatible carrier waves of LTE-A cell configuration, all the scheme than TI is good basically for our scheme 1 and scheme 2, and wherein the performance of scheme 2 is best.From the angle that realizes, our scheme does not need the sequence generation formula of LTE Release 8 is carried out any change, only is that the employed sequence of non-backward compatible carrier wave is in the long sequence, the sequence except first section.And the scheme of TI will be reversed to the sequence generation of downlink reference signal, is to bigger change of LTE Release 8 standards therefore.In addition, in the LTE-A system configuration, three scenes with up-downgoing polymerization carrier wave of single frequency range configuration are rare, so comprehensively, under LTE-A system configuration descending carrier number was not a lot of situation, our scheme had remarkable advantages.

Certainly; scheme 1 and scheme 2 be preferred embodiment just; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1, reduce the method for reference signal cubic measure CM in a kind of carrier aggregation scene, be applied to advanced long-term evolution system, comprising:

The base station generates a long sequence according to following formula:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

The base station is divided into the short sequence of K group with described long sequence, and selects wherein one group short sequence as the reference signal sequence that the descending carrier of backward compatibility uses, and selects wherein one or more groups short sequence as the reference signal sequence of non-backward compatible carrier waves use.

2, the method for claim 1 is characterized in that,

Described K=2, the long sequence that the base station generates is:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The base station is divided into 2 groups short sequences with described long sequence, and selects short sequence S ₁:

$S_1=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all non-backward compatibles.

3, the method for claim 1 is characterized in that,

Described K=N _{Non_Max}+ 1, N _{Non_Max}Be the maximum number of the descending carrier of non-backward compatible, the long sequence that the base station generates is:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The base station is divided into N with described long sequence _{Non_Max}+ 1 group short sequence, and select short sequence S ₁:

$S_1=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility;

Base station selected N _{Non_Max}Remove short sequence S in+1 group short sequence ₁The reference signal sequence that the short sequence of in addition other is used as the descending carrier of each non-backward compatible respectively, the descending carrier of each backward compatibility corresponding one short sequence.

4, method as claimed in claim 3 is characterized in that, the base station is according to the order of carrier frequency point height, and selective sequential the 2nd is to N _{Non_Max}The reference signal sequence that+1 group short sequence is used as the descending carrier of non-backward compatible.

5, as any described method in the claim 1～4, it is characterized in that,

Described base station and terminal are appointed the corresponding relation of the attribute of reference signal sequence and descending carrier;

Terminal adopts the corresponding reference signal sequence to detect according to the attribute of the descending carrier that uses;

The attribute of described descending carrier is meant: described descending carrier is backward compatibility or non-backward compatible.

6, reduce the device of reference signal CM in a kind of carrier aggregation scene, be applied to the base station of advanced long-term evolution system, it is characterized in that, comprising: the generation module of Xiang Lianing, grouping module and selection module successively,

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use.

7, device as claimed in claim 6 is characterized in that,

Described generation module is used to generate following long sequence:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Described grouping module is used for described long sequence is divided into 2 groups short sequences;

Described selection module is used to select short sequence S ₁:

$S_1=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility,

Select short sequence S ₂:

$S_2=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

$m=2N_{\mathrm{RB}}^{\max ,\mathrm{DL}},2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+1,...,4N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all non-backward compatibles.

8, device as claimed in claim 6 is characterized in that,

Described generation module is used to generate following long sequence:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2(N_{\mathrm{Non}\_\mathrm{Max}}+1)N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

N wherein _{Non_Max}Maximum number for the descending carrier of non-backward compatible;

Described grouping module is used for described long sequence is divided into N _{Non_Max}+ 1 group short sequence;

Described selection module is used to select short sequence S ₁:

$S_1=r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

The reference signal sequence that uses as the descending carrier of all backward compatibility;

Described selection module is used to select N _{Non_Max}Remove short sequence S in+1 group short sequence ₁The reference signal sequence that the short sequence of in addition other is used as the descending carrier of each non-backward compatible respectively, the descending carrier of each backward compatibility corresponding one short sequence.

9, device as claimed in claim 8 is characterized in that,

Described selection module also is used for the order according to the carrier frequency point height, and selective sequential the 2nd is to N _{Non_Max}The reference signal sequence that+1 group short sequence is used as the descending carrier of non-backward compatible.

10, reduce the device of reference signal CM in a kind of carrier aggregation scene, be applied to the base station and the terminal of advanced long-term evolution system, it is characterized in that described base station comprises generation module, grouping module and the selection module that links to each other successively, described terminal comprises detection module;

Described generation module is used for generating a long sequence according to following formula, and sends to grouping module:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,K*2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein, K is the integer greater than 1, N _RB ^{Max, DL}Be the maximum resource piece number of downlink transfer, n _sBe a time slot label in the radio frames, l is an OFDM symbol sequence number in the time slot, and c (i) is a pseudo random sequence;

Described grouping module is used for described long sequence is divided into the short sequence of K group, sends to the selection module;

Described selection module is used for selecting the reference signal sequence of one group short sequence of the short sequence of described K group as the descending carrier use of backward compatibility, and one or more groups the short sequence in the short sequence of selection K group is as the reference signal sequence of non-backward compatible carrier waves use;

Described detection module is used for according to the corresponding relation of the reference signal sequence of appointing with the base station with the attribute of descending carrier, and the attribute of the descending carrier that uses, and employing corresponding reference signal sequence detects.

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