CN102843173A - Antenna calibrating method and antenna s calibrating device in time division duplex coordinated multiple point system - Google Patents

Abstract

The invention discloses an antenna calibrating method and an antenna calibrating device used in a time division duplex coordinated multiple point system. The antenna calibrating method comprises a step of calibrating antennas among cells by a network side: selecting a standard antenna, taking the standard antenna as the standard, and calibrating reference antennas in all the cells; and a step of calibrating the antennas in the cells by the network side again: taking the reference antenna of the cell as the standard in each cell, and calibrating other antennas in the cell, excepting the reference antenna, wherein one of the antennas of the cell is selected as the reference antenna of the cell in each cell respectively. By using the protocol of calibrating the antennas among the cells firstly and then calibrating antennas in the cell on the basis of calibration among the cells, the reciprocity of an uplink and a downlink in the calibrated cell cannot be damaged; the channel reciprocity performance of the time division duplex (TDD) coordinated multiple point (CoMP) system is improved, so that the transmission performance of the CoMP system is also improved.

Description

Antenna calibration method and device in a kind of time division duplex Synergistic multi-point system

Technical field

The present invention relates to wireless communication technology field, relate in particular to antenna calibration method and device in a kind of time division duplex Synergistic multi-point system.

Background technology

Long Term Evolution (Long Term Evolution; Abbreviating LTE as) system defined FDD (Frequency Division Duplexing simultaneously; Abbreviate FDD as) and two kinds of different duplex modes of time division duplex (Time Division Duplexing abbreviates TDD as).FDD receives and sends on two symmetrical frequency channels that separate, and separates receiving and transmitting channel with the protection frequency range.TDD separates reception and transmitting channel with the time, and the carrying of the different time-gap of same frequency carrier as channel used in its reception and transmission.

TDD has symmetry (or being called reciprocity) with topmost different being of FDD, the up-downgoing physical channel of TDD, and FDD does not then have this reciprocity.Because reciprocity; (eNodeB or abbreviate eNB as) can pass through uplink detection signal (Sounding Reference Signal in base station in the TDD system; Abbreviate SRS as) measurement directly obtain descending channel information; Avoid subscriber equipment (User Equipment abbreviates UE as) too much to obtain whole descending channel informations feedback overhead the time, and then improve downlink data transmission quality and the ability of eNB.

But in real system, owing to factors such as not matching of phase place between receipts/two ends radio frequency (Radio Frequency the abbreviates RF as) link and gain cause the channel reciprocity in the TDD system unsatisfactory.In order to utilize reciprocity to obtain descending channel information more accurately,, therefore need carry out antenna calibration to guarantee the performance of descending scheduling and precoding.

The antenna calibration general purpose is to make to have identical amplitude and phase characteristic between the different antennae.Antenna calibration can be divided into base station end antenna calibration, UE end antenna calibration and base station and the calibration simultaneously of UE end according to the difference of calibrating position.But because the restriction of the volume of UE end, cost, computing capability etc., so antenna calibration only carries out in base station end usually.At present; In the existing TDD system; Like what use in TD SDMA (Time Division-Synchronous Code Division Multiple Access the abbreviates TD-SCDMA as) system is method for self-calibrating, promptly in single subdistrict; With wherein antenna of eNB as benchmark; Measure the round link channel information between this antenna and other antennas through feeder line or coupling circuit, obtain the factor that do not match between each antenna of eNB end respectively, thereby each antenna of this eNB is realized calibration.

Coordinate multipoint (Coordinated Multiple Point; Abbreviating CoMP as) technology is LTE-A (Long Term Evolution-Advanced; Senior LTE) system enlarges the important technology that network edge covers, guarantees edge customer QoS (Quality of Service, service quality).

For describing conveniently, make brief account in the face of some proprietary terms in the CoMP system down:

Cooperation set: for same user or multi-user carry out the set of the sub-district of collaboration services simultaneously;

Serving cell: refer generally to the user and belong to the sub-district, or that sub-district best to user's service quality;

Cooperation cell: the sub-district in the cooperation set except that the service sub-district;

CoMP user: the user who receives a plurality of cell coordination services promptly is called CoMP user.

In the CoMP system, a plurality of cell cooperatives are same or a plurality of user's services, so need between the antenna of a plurality of sub-districts, realize joint calibration.Because the remote distribution of each node (being eNB) in the CoMP system, it obviously is not all right that traditional method for self-calibrating based on single sub-district is applied directly to the CoMP system.In the existing antenna calibration scheme to the proposition of CoMP system; Or earlier the minizone calibration is carried out in the sub-district internal calibration again; Or to calibrating simultaneously with the minizone in the sub-district; Up-downgoing reciprocity in the sub-district that the former has calibrated before can destroying unavoidably, the latter implements and possibly compare difficulty.

Summary of the invention

The technical problem that the present invention solves provides antenna calibration method and device in a kind of time division duplex Synergistic multi-point system, can improve TDD CoMP system channel reciprocity performance, thereby improves the transmission performance of CoMP.

For solving the problems of the technologies described above, the invention provides the antenna calibration method in a kind of time division duplex Synergistic multi-point system, said method comprises:

Network side is calibrated the minizone antenna earlier, comprising: behind the selected reference antenna, be benchmark with said reference antenna, the reference antenna of all sub-districts is calibrated;

Network side is calibrated the sub-district internal antenna again, comprising: in each sub-district, be benchmark with this sub-district reference antenna, other antennas outside this sub-district internal reference antenna are calibrated;

Wherein, each sub-district is selected an antenna as a reference respectively from the antenna of this sub-district.

Further, said method also can have following characteristics:

The scope of said minizone antenna calibration comprises: all sub-districts in single or a plurality of cooperation set;

Wherein, there is at least one common cell in said a plurality of cooperation set.

Further, said method also can have following characteristics:

Said reference antenna comprises: one of them antenna of the coordinate multipoint of being served (CoMP) user; Perhaps, the reference antenna of Serving cell or cooperation cell in the cooperation set.

Further, said method also can have following characteristics:

When the scope of said minizone antenna calibration comprises all sub-districts of cooperating in gathering; Said minizone antenna calibration; Specifically comprise: by the selected said reference antenna of Serving cell basis in the said cooperation set; Reference antenna to all sub-districts is calibrated, and obtains the correction coefficient on each sub-district reference antenna, and notice is given respective cell;

When the scope of said minizone antenna calibration comprises all sub-districts in a plurality of cooperation set; Said minizone antenna calibration; Specifically comprise: from said a plurality of cooperation set, select the Serving cell of one of them cooperation set,, the reference antenna of all sub-districts is calibrated according to selected said reference antenna; Obtain the correction coefficient on each sub-district reference antenna, and notice is given respective cell.

Further, said method also can have following characteristics:

Said Serving cell passes through to measure the reference antenna of each sub-district and the round channel information between the said reference antenna, the correction coefficient on the reference antenna of said each sub-district of acquisition.

Further, said method also can have following characteristics:

Said Serving cell is measured the reference antenna of each sub-district and the round channel information between the said reference antenna in such a way:

If said reference antenna is CoMP user's a antenna; Then said reference antenna sends pilot tone to each sub-district reference antenna respectively; Each sub-district reference antenna is based on the said pilot tone that receives; Estimate the channel information of said reference antenna, and the channel information that is obtained is notified to said Serving cell to this sub-district reference antenna; Each sub-district reference antenna sends pilot tone to said reference antenna, and said reference antenna is estimated the channel information of each sub-district to this reference antenna based on the said pilot tone that receives, and gives said Serving cell with the feedback of channel information that is obtained;

If said reference antenna is the Serving cell reference antenna, then said reference antenna sends pilot tone to other sub-district reference antennas respectively; Other sub-district reference antennas are estimated the channel information of said reference antenna to this sub-district reference antenna respectively based on received said pilot tone, and the channel information that will be obtained is separately notified to Serving cell; Pilot tone is sent to said reference antenna in other sub-districts, and said reference antenna is estimated the channel information of other each sub-districts to this reference antenna based on the said pilot tone that receives;

If said reference antenna is the cooperation cell reference antenna; Then said reference antenna sends pilot tone to other each sub-district reference antennas respectively; Other each sub-district reference antennas are based on the said pilot tone that receives; Estimate the channel information of said reference antenna, and the channel information that is obtained is notified to said Serving cell to this sub-district reference antenna; Other each sub-district reference antennas send pilot tone to said reference antenna, and said reference antenna is estimated the channel information of other each sub-districts to this reference antenna based on the said pilot tone that receives, and gives said Serving cell with the feedback of channel information that is obtained.

Further, said method also can have following characteristics: when said network side is calibrated the sub-district internal antenna,

Said in each sub-district; With this sub-district reference antenna is benchmark; Other antennas to outside this sub-district internal reference antenna are calibrated; Be meant: according to the correction coefficient on this sub-district reference antenna of said minizone antenna calibration acquisition, and this sub-district reference antenna that measures and the round channel information between other antennas, obtain the correction coefficient on other each antennas of this sub-district;

Wherein, measure said round channel information between this sub-district reference antenna and other antennas in such a way:

This sub-district reference antenna is to other antenna transmission pilot tones of this sub-district, and other each antennas of this sub-district are estimated the channel information of this sub-district reference antenna to this antenna based on the said pilot tone that receives; Other alignment this sub-district reference antenna in this sub-district sends pilot tone each day, and this sub-district reference antenna is estimated the channel information of other each antennas to this reference antenna based on the said pilot tone that receives.

Further, said method also can have following characteristics:

Said reference antenna, reference antenna through eat dishes without rice or wine, feeder line or special correcting circuit send pilot tone.

Further, said method also can have following characteristics:

The pilot tone of said reference antenna, reference antenna, other antenna transmission; Comprise: public guide frequency (CRS), channel state information reference signals (CSI-RS), descending demodulation pilot frequency (DMRS), detection reference signal (SRS), uplink demodulation pilot tone (DMRS) perhaps are specifically designed to the pilot signal of antenna calibration.

Further, said method also can have following characteristics:

Said other sub-district reference antennas comprise to the mode of said reference antenna transmission pilot tone: the mode of time-division, and promptly each sub-district is switched the mode of pilot tone separately of sending in turn; The mode that sign indicating number divides, promptly the pilot frequency sequence signal of different quadratures is used in each sub-district;

This sub-district of alignment reference antenna sends the mode of pilot tone other days in said each sub-district, comprising: the mode of time-division, and promptly each antenna switches the mode of pilot tone separately of sending in turn; The mode that sign indicating number divides, promptly each antenna uses the pilot frequency sequence signal of different quadratures.

Further, said method also can have following characteristics:

Said antenna calibration is that employing cycle or aperiodic mode are carried out on time slot that is specifically designed to antenna calibration or subframe.

Further, said method also can have following characteristics:

Said time slot or the subframe that is specifically designed to antenna calibration is meant: that network and user make an appointment or through the semi-static notice of Radio Resource control (RRC) signaling, or through system information block (SIB) 2 or SIB3 signaling broadcast announcement.

The present invention also provides the antenna calibration device in a kind of time division duplex Synergistic multi-point system, is applied to network side, and said device comprises:

Antenna calibration unit, minizone is used for: the selected reference antenna, and be benchmark with said reference antenna, the reference antenna of all sub-districts is calibrated;

Sub-district internal antenna alignment unit is used for: selecting an antenna as a reference from the antenna of this sub-district, is benchmark with this sub-district reference antenna, and other antennas outside this sub-district internal reference antenna are calibrated.

Further, said apparatus also can have following characteristics:

Antenna calibration unit, said minizone is used for, and the minizone antenna calibration is carried out in all sub-districts in single or a plurality of cooperation set;

Wherein, there is at least one common cell in said a plurality of cooperation set.

Further, said apparatus also can have following characteristics:

The said reference antenna that antenna calibration unit, said minizone is selected comprises: the coordinate multipoint of being served (CoMP) user's antenna; Perhaps, the reference antenna of Serving cell or cooperation cell in the said cooperation set.

Further, said apparatus also can have following characteristics:

Antenna calibration unit, said minizone is positioned at the Serving cell of said single cooperation set, or the Serving cell of one of them the cooperation set in said a plurality of cooperation set;

Antenna calibration unit, said minizone is used for, and according to selected said reference antenna, the reference antenna of all sub-districts is calibrated, and obtains the correction coefficient on each sub-district reference antenna, and notice is given respective cell.

Further; Said apparatus also can have following characteristics: antenna calibration unit, said minizone is used for; Reference antenna through measuring each sub-district and the round channel information between the said reference antenna obtain the correction coefficient on the reference antenna of said each sub-district.

Further, said apparatus also can have following characteristics:

Said sub-district internal antenna alignment unit is used for; According to the correction coefficient on this sub-district reference antenna of said minizone antenna calibration acquisition; And this sub-district reference antenna that measures and the round channel information between other antennas, obtain the correction coefficient on other each antennas of this sub-district.

The present invention proposes a kind of elder generation the minizone antenna is calibrated; The scheme of again the sub-district internal antenna being calibrated on the basis based on the minizone calibration; Can not destroy the up-downgoing reciprocity in the sub-district of having calibrated; Improve the channel reciprocity performance of TDD CoMP system, and then also improved the transmission performance of CoMP system; In addition, the present invention program realizes simply, is easy to promote.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the overall procedure sketch map of antenna calibration method of the present invention;

Fig. 2 is the sketch map of minizone of the present invention antenna calibration;

Fig. 3 is the sketch map of sub-district of the present invention internal antenna calibration.

Embodiment

Core concept of the present invention is that the shortcoming to existing CoMP system antenna calibration program proposes a kind of elder generation the minizone is calibrated, the scheme of again the sub-district internal antenna being calibrated on the basis based on the minizone calibration.

Based on above-mentioned thought, the present invention proposes the antenna calibration method of a kind of TDD CoMP system, and is as shown in Figure 1, mainly comprises the steps:

Step 101, at first, network side carries out the minizone antenna calibration, comprising: behind the selected reference antenna, be benchmark with the reference antenna, the reference antenna of all sub-districts is calibrated;

Step 102, then, network side is accomplished sub-district internal antenna self calibration in each sub-district: in each sub-district, be benchmark with this sub-district reference antenna, other antennas outside this sub-district internal reference antenna are calibrated.

Wherein, each sub-district is selected the reference antenna of an antenna as this sub-district separately.

Wherein, said antenna calibration can be the cycle or aperiodic mode on time slot that is specifically designed to antenna calibration or subframe, carry out.

Said time slot or the subframe that is specifically designed to antenna calibration can be that network and user make an appointment, or through RRC (Radio Resource control) the semi-static notice of signaling, or passes through SIB (system information block) x (x=2,3) signaling broadcast announcement.

Further, the scope of said minizone antenna calibration comprises all sub-districts in the same cooperation set.

In conjunction with shown in Figure 2, said minizone antenna calibration specifically comprises:

Selected reference antenna, and each sub-district is selected the reference antenna (Ref) of an antenna as this sub-district self separately; Serving cell is benchmark with the reference antenna, and the reference antenna of all sub-districts is calibrated, and obtains the correction coefficient on the reference antenna of each sub-district self, and the correction coefficient on the reference antenna of other sub-districts self is notified respectively to other sub-districts.

Further, described reference antenna can be: one of them antenna of the CoMP user who is served; Perhaps, the reference antenna of certain sub-district (comprising Serving cell or cooperation cell) in the cooperation set.Preferably, with the Serving cell reference antenna as reference antenna (for example with the reference antenna of eNodeB1 among Fig. 2 as reference antenna).

Wherein, said is a constant as the correction coefficient on the antenna of benchmark, preferably can be made as 1.

Further, obtaining the method for the correction coefficient on the reference antenna of each sub-district self, is through measuring this sub-district reference antenna and obtaining as the round channel information between the antenna of benchmark.

For example; A kind of comparatively simple implementation is; For the minizone antenna calibration, according to reference antenna to the channel fading coefficient of this sub-district reference antenna and this sub-district reference antenna to the ratio of the channel fading coefficient of reference antenna, obtain the correction coefficient on the reference antenna of each sub-district self.

Further, the method for the round channel information of above-mentioned measurement comprises:

If reference antenna is CoMP user's a antenna; Then reference antenna sends pilot tone to each sub-district reference antenna respectively through eating dishes without rice or wine; Each sub-district reference antenna is based on the said pilot tone that receives; Estimate the channel information of this reference antenna, and Serving cell will be given with obtaining feedback of channel information separately in each sub-district to this sub-district reference antenna; Each sub-district reference antenna sends pilot tone to reference antenna through eating dishes without rice or wine, reference antenna is estimated the channel information of each sub-district to it based on the said pilot tone that receives, and gives Serving cell with the feedback of channel information that is obtained;

If reference antenna is the Serving cell reference antenna; Then reference antenna sends pilot tone to other sub-district reference antennas respectively; Other sub-district reference antennas are based on received said pilot tone; Estimate the channel information of this reference antenna, and institute's feedback of channel information that obtains is given Serving cell separately to this sub-district reference antenna; Pilot tone is sent to reference antenna in other sub-districts, and reference antenna is estimated the channel information of each sub-district to it based on the said pilot tone that receives;

If reference antenna is the cooperation cell reference antenna; Then reference antenna sends pilot tone to each sub-district reference antenna respectively; Each sub-district reference antenna is based on the said pilot tone that receives; Estimate the channel information of this reference antenna, and Serving cell will be given with obtaining feedback of channel information separately in each sub-district to this sub-district reference antenna; Each sub-district reference antenna sends pilot tone to reference antenna through eating dishes without rice or wine, reference antenna is estimated the channel information of each sub-district to it based on the said pilot tone that receives, and gives Serving cell with the feedback of channel information that is obtained.

Wherein, reference antenna and other sub-district reference antennas can through eat dishes without rice or wine, feeder line or special correcting circuit send pilot tone respectively (when reference antenna is CoMP user's antenna, can only through the mode of eating dishes without rice or wine).

Further, said reference antenna and the pilot tone that other sub-district reference antennas send can be public guide frequency (CRS; Common Reference Signal), perhaps channel state information reference signals (CSI-RS, Channel State Information-Reference Signal); Perhaps descending demodulation pilot frequency (DMRS; Demodulated Reference Signal), perhaps detection reference signal (SRS, Sounding Reference Signal); Perhaps uplink demodulation pilot tone (DMRS), or the newly-designed pilot signal that is specifically designed to antenna calibration.

Said other sub-district reference antennas to the mode that reference antenna sends pilot tone can be:

Time-division: promptly each sub-district is switched the mode of pilot tone separately of sending in turn;

Sign indicating number divides: promptly the pilot frequency sequence signal of different quadratures is used in each sub-district.

In addition, the scope of said minizone antenna calibration also can be all sub-districts in a plurality of cooperation set, has at least one common cell in said a plurality of cooperation set.

Preferably; When the scope of minizone antenna calibration is all sub-districts in a plurality of cooperation cell set, be that benchmark carries out the minizone calibration according to the method described above to all sub-districts in these a plurality of cooperation cell set with the reference antenna of the Serving cell of some cooperation set.

Further, as shown in Figure 3, in each sub-district, be benchmark with this sub-district reference antenna (Ref), other antennas of this sub-district are calibrated.

Particularly, through measuring the round channel information between this sub-district reference antenna and other antennas, obtain the correction coefficient of these other each antennas of sub-district.For example; Correction coefficient on this this sub-district reference antenna that is obtained according to the minizone antenna calibration before this sub-district internal reference antenna multiply by to the ratio of the channel fading coefficient of this reference antenna with other antennas respectively to the channel fading coefficient of other antennas again obtains the correction coefficient on other each antennas of this sub-district.

Further, measure the method that this sub-district reference antenna and other antennas come and go channel, can use traditional automatic correcting method; The perhaps method through the pilot tone of eating dishes without rice or wine.

In conjunction with shown in Figure 3, the said pilot frequency system of eating dishes without rice or wine specifically comprises:

This sub-district reference antenna is through eating dishes without rice or wine to other antenna transmission pilot tones of this sub-district, and other antennas of this sub-district are estimated the channel information of this reference antenna to oneself based on the said pilot tone that receives; Other antennas of this sub-district send pilot tone through eating dishes without rice or wine to this sub-district reference antenna, and this sub-district reference antenna is estimated the channel information of other antennas to it based on the said pilot tone that receives.

The pilot tone that said this sub-district reference antenna and other antennas of this sub-district send can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed pilot signal that is specifically designed to antenna calibration.

The mode that said this sub-district other days alignment reference antenna sends pilot tone can be:

Time-division: promptly each antenna switches the mode of pilot tone separately of sending in turn;

Sign indicating number divides: promptly each antenna uses the pilot frequency sequence signal of different quadratures.

Particularly, suppose that the sub-district number in the cooperation set is 2, promptly have 2 sub-districts (for example eNB1 and eNB2) cooperation to be same CoMP user's service, and eNB1 be this user's a Serving cell:

CoMP user has M antenna, and the simulation coefficient of sending out, receive on i antenna is respectively T _UE(i), R _UE(i), the emission correction coefficient on i antenna is c _UE(i), and antenna m1 be this user's reference antenna.

ENB1 has N1 antenna, and the simulation coefficient of sending out, receive on j antenna is respectively T _BS1(j), R _BS1(j), the emission correction coefficient on j antenna is c _BS1(j), and antenna n1 be the reference antenna of eNB1.

ENB2 has N2 antenna, and the simulation coefficient of sending out, receive on q antenna is respectively T _BS2(q), R _BS2(q), the emission correction coefficient on q antenna is c _BS2(q), and w1 be the reference antenna of eNB2.

Step 1: minizone antenna calibration.

The antenna n1 that measures eNB1 can obtain this channel to the channel between the antenna w1 of eNB2 at the eNB2 end, and this channel can be expressed as:

$h_{n1,w1}^{\mathrm{inter}}=T_{\mathrm{BS}1}\left(n1\right)\·g_{n1,w1}^{\mathrm{inter}}\·R_{\mathrm{BS}2}\left(w1\right)$

Wherein,

is that the antenna n1 of eNB1 is to the space channel between the antenna w1 of eNB2.

The antenna w1 that measures eNB2 can obtain this channel to the channel between the antenna n1 of eNB1

at the eNB1 end, and this channel can be expressed as:

$h_{w1,n1}^{\mathrm{inter}}=T_{\mathrm{BS}2}\left(w1\right)\·g_{w1,n1}^{\mathrm{inter}}\·R_{\mathrm{BS}1}\left(n1\right)$

Wherein,

is that the antenna w1 of eNB2 is to the space channel between the antenna n1 of eNB1.

Space channel between the antenna n1 of eNB1 and the antenna w1 of eNB2 satisfies:

$g_{n1,w1}^{\mathrm{inter}}=g_{w1,n1}^{\mathrm{inter}}$

ENB1 feeds back to

eNB2, can obtain at the eNB2 end so:

$\frac{h_{w1,n1}^{\mathrm{inter}}}{h_{n1,w1}^{\mathrm{inter}}}=\frac{T_{\mathrm{BS}2}\left(w1\right)\·R_{\mathrm{BS}1}\left(n1\right)}{T_{\mathrm{BS}1}\left(n1\right)\·R_{\mathrm{BS}2}\left(w1\right)}=\frac{c_{\mathrm{BS}1}}{c_{\mathrm{BS}2}}$

For being without loss of generality, suppose c _BS1=1, then the reference antenna correction coefficient of eNB2 should be:

$c_{\mathrm{BS}2}=\frac{h_{n1,w1}^{\mathrm{inter}}}{h_{w1,n1}^{\mathrm{inter}}}$

and

can obtain through self-tuning method, carries out self calibration with the antenna n1 of eNB1 as the common reference antenna of the antenna w1 of the antenna n1 of eNB1 and eNB2.

and

also can obtain through the method for pilot measurement, that is:

ENB1 goes up the emission measurement pilot signal from antenna n1; ENB2 receives the measurement pilot signals that eNB1 sent from antenna w1, and according to the pilot signal that is received is estimated

ENB2 goes up the emission measurement pilot signal from antenna w1; ENB1 receives the measurement pilot signals that eNB2 sent from antenna n1, and according to the pilot signal that is received is estimated

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Step 2: single sub-district internal calibration.

In eNB1, be its reference antenna with antenna n1, carry out the antenna calibration on the eNB1 according to method for self-calibrating, be elaborated in the face of the method for self-calibrating on the eNB1 down.

Before the correction:

$h_{n,m}^{(\mathrm{DL},1)}=T_{\mathrm{BS}1}\left(n\right)\·g_{n,m}^{(\mathrm{DL},1)}\·R_{\mathrm{UE}}\left(m\right)$ (1)

$h_{m,n}^{(\mathrm{UL},1)}=T_{\mathrm{UE}}\left(m\right)\·g_{m,n}^{(\mathrm{UL},1)}\·R_{\mathrm{BS}1}\left(n\right)$

Wherein,

and is respectively UL and the actual channel of DL between user's n the antenna of m antenna and eNB1, and actual channel satisfies the measured channel that

and

are respectively UL and DL.

Proofread and correct the back:

$a_{m,n}^{(\mathrm{UL},1)}=c_{\mathrm{UE}}\left(m\right)h_{m,n}^{(\mathrm{UL},1)},$ $a_{n,m}^{\left(\mathrm{DL}\right)}=c_{\mathrm{BS}1}\left(n\right)h_{n,m}^{\left(\mathrm{DL}\right)};$

And $\frac{a_{n,m}^{\mathrm{DL},1}}{a_{m,n}^{\mathrm{UL},1}}={\mathrm{\γ}}_{\mathrm{BS}1},$

That is:

$\frac{a_{\mathrm{1,1}}^{(\mathrm{DL},1)}}{a_{\mathrm{1,1}}^{(\mathrm{UL},1)}}=\frac{a_{n,m}^{(\mathrm{DL},1)}}{a_{m,n}^{(\mathrm{UL},1)}},m=1,...,M;n=1,...,N1---\left(2\right)$

Wherein,

is respectively user's m antenna and UL after the correction between n antenna and the measured channel of DL.

Can be found out that by (2) formula after the calibration, each antenna has identical up-downgoing ratio, this also carries out the purpose of antenna calibration just.

By (1) and (2) also can equivalence be:

$\frac{c_{\mathrm{UE}}\left(1\right)T_{\mathrm{UE}}\left(1\right)}{R_{\mathrm{UE}}\left(1\right)}=\frac{c_{\mathrm{UE}}\left(2\right)T_{\mathrm{UE}}\left(2\right)}{R_{\mathrm{UE}}\left(2\right)}=...=\frac{c_{\mathrm{UE}}\left(M\right)T_{\mathrm{UE}}\left(M\right)}{R_{\mathrm{UE}\left(M\right)}}$

$\frac{c_{\mathrm{BS}1}\left(1\right)T_{\mathrm{BS}1}\left(1\right)}{R_{\mathrm{BS}1}\left(1\right)}=\frac{c_{\mathrm{BS}1}\left(2\right)T_{\mathrm{BS}1}\left(2\right)}{R_{\mathrm{BS}1}\left(2\right)}=...=\frac{c_{\mathrm{BS}1}\left(N1\right)T_{\mathrm{BS}1}\left(N\right)}{R_{\mathrm{BS}1}\left(N1\right)}$

See below through self-correcting process (two-way channel based on 2 antennas is measured) and realize The above results:

ENB1 holds self-correcting:

$h_{n2,n1}^{(\mathrm{BS}1\_\mathrm{self})}=T_{\mathrm{BS}1}\left(n2\right)\·g_{n2,n1}^{(\mathrm{BS}1\_\mathrm{self})}\·R_{\mathrm{BS}1}\left(n1\right)$

$h_{n1,n2}^{(\mathrm{BS}1\_\mathrm{self})}=T_{\mathrm{BS}1}\left(n1\right)\·g_{n1,n2}^{(\mathrm{BS}1\_\mathrm{self})}\·R_{\mathrm{BS}1}\left(n2\right)$

and

is respectively that the antenna n2 of eNB1 is to measured channel and space channel between the antenna n1;

and

be respectively the antenna m1 of eNB1 to measured channel and space channel between the antenna m2, then eNB1 correction coefficient:

$\frac{c_{\mathrm{BS}1}\left(n1\right)}{c_{\mathrm{BS}1}\left(n2\right)}=\frac{T_{\mathrm{BS}1}\left(n2\right)}{R_{\mathrm{UE}}\left(n2\right)}\frac{R_{\mathrm{BS}1}\left(n1\right)}{T_{\mathrm{UE}}\left(n1\right)}=\frac{h_{n2,n1}^{(\mathrm{BS}1\_\mathrm{self})}}{h_{n1,n2}^{(\mathrm{UE}\_\mathrm{self})}}$

Thus, the c that obtains based on step 1 _BS1(n1), can obtain antenna correction factor c on the antenna n2 of eNB1 _BS1(n2).

In eNB2, be its reference antenna in like manner, carry out the antenna calibration on the eNB2, be elaborated in the face of the antenna calibration method on the eNB2 down according to method for self-calibrating with antenna w1.

Before the correction:

$h_{n,m}^{(\mathrm{DL},2)}=T_{\mathrm{BS}2}\left(n\right)\·g_{n,m}^{(\mathrm{DL},2)}\·R_{\mathrm{BS}2}\left(m\right)$ (3)

$h_{m,n}^{(\mathrm{UL},2)}=T_{\mathrm{UE}}\left(m\right)\·g_{m,n}^{(\mathrm{UL},2)}\·R_{\mathrm{UE}}\left(n\right)$

Wherein,

and

is respectively UL and the actual channel of DL between user's n the antenna of m antenna and eNB2, and actual channel satisfies the measured channel that

and

are respectively UL and DL.

Proofread and correct the back:

$a_{m,n}^{(\mathrm{UL},2)}=c_{\mathrm{UE}}\left(m\right)h_{m,n}^{(\mathrm{UL},2)},$ $a_{n,m}^{(\mathrm{DL},2)}=c_{\mathrm{BS}2}\left(n\right)h_{n,m}^{(\mathrm{DL},2)}$

And $\frac{a_{n,m}^{\mathrm{DL},2}}{a_{m,n}^{\mathrm{UL},2}}={\mathrm{\γ}}_{\mathrm{BS}2}$

Promptly

$\frac{a_{\mathrm{1,1}}^{(\mathrm{DL},2)}}{a_{\mathrm{1,1}}^{(\mathrm{UL},2)}}=\frac{a_{n,m}^{(\mathrm{DL},2)}}{a_{m,n}^{(\mathrm{UL},2)}},m=1,...,M,n=1,...,N2---\left(4\right)$

By (3) and (4) also can equivalence be:

$\frac{c_{\mathrm{UE}}\left(1\right)T_{\mathrm{UE}}\left(1\right)}{R_{\mathrm{UE}}\left(1\right)}=\frac{c_{\mathrm{UE}}\left(2\right)T_{\mathrm{UE}}\left(2\right)}{R_{\mathrm{UE}}\left(2\right)}=...=\frac{c_{\mathrm{UE}}\left(M\right)T_{\mathrm{UE}}\left(M\right)}{R_{\mathrm{UE}\left(M\right)}}$

$\frac{c_{\mathrm{BS}2}\left(1\right)T_{\mathrm{BS}2}\left(1\right)}{R_{\mathrm{BS}2}\left(1\right)}=\frac{c_{\mathrm{BS}2}\left(2\right)T_{\mathrm{BS}2}\left(2\right)}{R_{\mathrm{BS}2}\left(2\right)}=...=\frac{c_{\mathrm{BS}2}\left(N2\right)T_{\mathrm{BS}2}\left(N2\right)}{R_{\mathrm{BS}2}\left(N2\right)}$

See below through self-correcting process (two-way channel based on 2 antennas is measured) and realize The above results:

ENB2 holds self-correcting:

$h_{w2,w1}^{(\mathrm{BS}2\_\mathrm{self})}=T_{\mathrm{BS}2}\left(w2\right)\·g_{w2,w1}^{(\mathrm{BS}2\_\mathrm{self})}\·R_{\mathrm{BS}2}\left(w1\right)$

$h_{w1,w2}^{(\mathrm{BS}2\_\mathrm{self})}=T_{\mathrm{BS}2}\left(w1\right)\·g_{w1,w2}^{(\mathrm{BS}2\_\mathrm{self})}\·R_{\mathrm{BS}2}\left(w2\right)$

and

is respectively that the antenna w2 of eNB2 is to measured channel and space channel between the antenna w1;

and

be respectively the antenna w1 of eNB2 to measured channel and space channel between the antenna w2, then eNB2 correction coefficient:

$\frac{c_{\mathrm{BS}2}\left(w1\right)}{c_{\mathrm{BS}2}\left(w2\right)}=\frac{T_{\mathrm{BS}2}\left(w2\right)}{R_{\mathrm{BS}2}\left(w2\right)}\frac{R_{\mathrm{BS}2}\left(w1\right)}{T_{\mathrm{BS}2}\left(w1\right)}=\frac{h_{w2,w1}^{(\mathrm{BS}2\_\mathrm{self})}}{h_{w1,w2}^{(\mathrm{BS}2\_\mathrm{self})}}$

Thus, based on the c that obtains in the step 1 _BS2(w1), can obtain the correction coefficient c of the antenna w2 of eNB2 _BS2(w2).

For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.

Embodiment one

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 101:eNB1 and the reference antenna w1 of eNB2 are through eating dishes without rice or wine to CoMP user's antenna m1 pilot signal transmitted; The user receives the reference antenna n1 that estimates eNB1 after the said pilot signal respectively channel information to the reference antenna w1 of the channel information of user's reference antenna m1 and eNB2 to user's reference antenna m1, and it is fed back to eNB1.

Step 102:CoMP user's antenna m1 is to eNB1 and eNB2 pilot signal transmitted; ENB1 and eNB2 only use antenna n1 and antenna w1 to receive respectively; ENB1 estimates the channel information of user antenna m1 to eNB1 after receiving said pilot signal, and eNB2 estimates the channel information of user antenna m1 to eNB2 after receiving said pilot signal.

Step 103:eNB1 obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1 based on the round channel information between the above-mentioned eNB1 that obtains, eNB2 and the CoMP user.

Step 104:eNB1 notifies the calibration factor on the antenna w1 of eNB2 to eNB2.

Step 105:eNB1 uses traditional automatic correcting method that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses traditional automatic correcting method that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Embodiment two

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 201:eNB1 after eNB2 receives said pilot signal, estimates the channel information of the antenna n1 of eNB1 to the antenna w1 of eNB2, and it is fed back to eNB1 through eating dishes without rice or wine to the reference antenna w1 of eNB2 pilot signal transmitted.

The reference antenna w1 of step 202:eNB2 is through eating dishes without rice or wine to the reference antenna n1 of eNB1 pilot signal transmitted, and after eNB1 received said pilot signal, the antenna w1 that estimates eNB2 was to the channel information between the antenna n1 of eNB1.

Step 203:eNB1 is based on the round channel information between above-mentioned eNB1 that obtains and the eNB2, obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1.

Step 204:eNB1 notifies the correction coefficient on the antenna w1 of eNB2 to eNB2.

Step 205:eNB1 uses traditional automatic correcting method that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses traditional automatic correcting method that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Embodiment three

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 301:eNB1 through feeder line or special correcting circuit to the reference antenna w1 of eNB2 pilot signal transmitted; After eNB2 receives said pilot signal; Estimate the channel information of the antenna n1 of eNB1, and it is fed back to eNB1 to the antenna w1 of eNB2.

To the reference antenna n1 of eNB1 pilot signal transmitted, after eNB1 received said pilot signal, the antenna w1 that estimates eNB2 was to the channel information between the antenna n1 of eNB1 through feeder line or special correcting circuit for the reference antenna w1 of step 302:eNB2.

Step 303:eNB1 is based on the round channel information between above-mentioned eNB1 that obtains and the eNB2, obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1.

Step 304:eNB1 notifies the correction coefficient on the antenna w1 of eNB2 to eNB2.

Step 305:eNB1 uses traditional automatic correcting method that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses traditional automatic correcting method that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Embodiment four

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 401:eNB1 and the reference antenna w1 of eNB2 are through eating dishes without rice or wine to CoMP user's antenna m1 pilot signal transmitted; The user receives the reference antenna n1 that estimates eNB1 after the said pilot signal respectively channel information to the reference antenna w1 of the channel information of user's reference antenna m1 and eNB2 to user's reference antenna m1, and it is fed back to eNB1.

Step 402:CoMP user's antenna m1 is to eNB1 and eNB2 pilot signal transmitted; ENB1 and eNB2 only use antenna n1 and antenna w1 to receive respectively; ENB1 estimates the channel information of user antenna m1 to eNB1 after receiving said pilot signal, and eNB2 estimates the channel information of user antenna m1 to eNB2 after receiving said pilot signal.

Step 403:eNB1 obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1 based on the round channel information between the above-mentioned eNB1 that obtains, eNB2 and the CoMP user.

Step 404:eNB1 notifies the calibration factor on the antenna w1 of eNB2 to eNB2.

Step 405:eNB1 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Embodiment five

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 501:eNB1 after eNB2 receives said pilot signal, estimates the channel information of the antenna n1 of eNB1 to the antenna w1 of eNB2, and it is fed back to eNB1 through eating dishes without rice or wine to the reference antenna w1 of eNB2 pilot signal transmitted.

The reference antenna w1 of step 502:eNB2 is through eating dishes without rice or wine to the reference antenna n1 of eNB1 pilot signal transmitted, and after eNB1 received said pilot signal, the antenna w1 that estimates eNB2 was to the channel information between the antenna n1 of eNB1.

Step 503:eNB1 is based on the round channel information between above-mentioned eNB1 that obtains and the eNB2, obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1.

Step 504:eNB1 notifies the correction coefficient on the antenna w1 of eNB2 to eNB2.

Step 505:eNB1 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

Embodiment six

The antenna calibration method of present embodiment specifically describes as follows:

The reference antenna n1 of step 601:eNB1 through feeder line or special correcting circuit to the reference antenna w1 of eNB2 pilot signal transmitted; After eNB2 receives said pilot signal; Estimate the channel information of the antenna n1 of eNB1, and it is fed back to eNB1 to the antenna w1 of eNB2.

To the reference antenna n1 of eNB1 pilot signal transmitted, after eNB1 received said pilot signal, the antenna w1 that estimates eNB2 was to the channel information between the antenna n1 of eNB1 through feeder line or special correcting circuit for the reference antenna w1 of step 602:eNB2.

Step 603:eNB1 is based on the round channel information between above-mentioned eNB1 that obtains and the eNB2, obtains the correction coefficient on the antenna w1 of antenna n1 and eNB2 of eNB1.

Step 604:eNB1 notifies the correction coefficient on the antenna w1 of eNB2 to eNB2.

Step 605:eNB1 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB1 is gone up other antennas based on antenna n1 and calibrates; ENB2 uses the pilot tone bearing calibration of eating dishes without rice or wine that eNB2 is gone up other antennas based on antenna w1 and calibrates.

Said pilot signal can be CRS, perhaps CSI-RS, perhaps descending DMRS, perhaps SRS, perhaps up DMRS, or the newly-designed signal that is specifically designed to antenna calibration.

The foregoing description is based on the situation that 2 sub-districts are arranged in the cooperation set, is easy to expand to the situation that cooperation cell has a plurality of sub-districts.

The foregoing description is based on the situation of having only a cooperation set; When a sub-district belongs to a plurality of different cooperations set simultaneously; The joint antenna calibration is carried out in these a plurality of cooperation set, and the reference antenna that is adopted when wherein carrying out the minizone calibration can be the reference antenna of the Serving cell of some cooperation set.

In addition, the antenna calibration device in a kind of time division duplex coordinate multipoint communication system is provided also in the embodiment of the invention, has been applied to network side, this device mainly comprises:

Antenna calibration unit, minizone is used for: the selected reference antenna, and be benchmark with said reference antenna, the reference antenna of all sub-districts is calibrated;

Sub-district internal antenna alignment unit is used for: selecting an antenna as a reference from the antenna of this sub-district, is benchmark with this sub-district reference antenna, and other antennas outside this sub-district internal reference antenna are calibrated.

Further, antenna calibration unit, said minizone is used for, and the minizone antenna calibration is carried out in all sub-districts in single or a plurality of cooperation set;

Wherein, there is at least one common cell in said a plurality of cooperation set.

Further, the said reference antenna that antenna calibration unit, said minizone is selected comprises: the coordinate multipoint of being served (CoMP) user's antenna; Perhaps, the reference antenna of Serving cell or cooperation cell in the said cooperation set.

Further, antenna calibration unit, said minizone is positioned at the Serving cell of said single cooperation set, or the Serving cell of one of them the cooperation set in said a plurality of cooperation set;

Antenna calibration unit, said minizone is used for, and according to selected said reference antenna, the reference antenna of all sub-districts is calibrated, and obtains the correction coefficient on each sub-district reference antenna, and notice is given respective cell.

Further, antenna calibration unit, said minizone is used for, and reference antenna through measuring each sub-district and the round channel information between the said reference antenna obtain the correction coefficient on the reference antenna of said each sub-district.

Further; Said sub-district internal antenna alignment unit is used for; According to the correction coefficient on this sub-district reference antenna of said minizone antenna calibration acquisition; And this sub-district reference antenna that measures and the round channel information between other antennas, obtain the correction coefficient on other each antennas of this sub-district.

More than be merely preferred case study on implementation of the present invention; Be not limited to the present invention; 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 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.

Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

Claims (18)

1. the antenna calibration method in the time division duplex Synergistic multi-point system is characterized in that said method comprises:

Network side is calibrated the minizone antenna earlier, comprising: behind the selected reference antenna, be benchmark with said reference antenna, the reference antenna of all sub-districts is calibrated;

Network side is calibrated the sub-district internal antenna again, comprising: in each sub-district, be benchmark with this sub-district reference antenna, other antennas outside this sub-district internal reference antenna are calibrated;

Wherein, each sub-district is selected an antenna as a reference respectively from the antenna of this sub-district.

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

The scope of said minizone antenna calibration comprises: all sub-districts in single or a plurality of cooperation set;

Wherein, there is at least one common cell in said a plurality of cooperation set.

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

Said reference antenna comprises: one of them antenna of the coordinate multipoint of being served (CoMP) user; Perhaps, the reference antenna of Serving cell or cooperation cell in the cooperation set.

4. method as claimed in claim 3 is characterized in that,

When the scope of said minizone antenna calibration comprises all sub-districts of cooperating in gathering; Said minizone antenna calibration; Specifically comprise: by the selected said reference antenna of Serving cell basis in the said cooperation set; Reference antenna to all sub-districts is calibrated, and obtains the correction coefficient on each sub-district reference antenna, and notice is given respective cell;

When the scope of said minizone antenna calibration comprises all sub-districts in a plurality of cooperation set; Said minizone antenna calibration; Specifically comprise: from said a plurality of cooperation set, select the Serving cell of one of them cooperation set,, the reference antenna of all sub-districts is calibrated according to selected said reference antenna; Obtain the correction coefficient on each sub-district reference antenna, and notice is given respective cell.

5. method as claimed in claim 4 is characterized in that,

Said Serving cell passes through to measure the reference antenna of each sub-district and the round channel information between the said reference antenna, the correction coefficient on the reference antenna of said each sub-district of acquisition.

6. method as claimed in claim 5 is characterized in that,

Said Serving cell is measured the reference antenna of each sub-district and the round channel information between the said reference antenna in such a way:

If said reference antenna is CoMP user's a antenna; Then said reference antenna sends pilot tone to each sub-district reference antenna respectively; Each sub-district reference antenna is based on the said pilot tone that receives; Estimate the channel information of said reference antenna, and the channel information that is obtained is notified to said Serving cell to this sub-district reference antenna; Each sub-district reference antenna sends pilot tone to said reference antenna, and said reference antenna is estimated the channel information of each sub-district to this reference antenna based on the said pilot tone that receives, and gives said Serving cell with the feedback of channel information that is obtained;

If said reference antenna is the Serving cell reference antenna, then said reference antenna sends pilot tone to other sub-district reference antennas respectively; Other sub-district reference antennas are estimated the channel information of said reference antenna to this sub-district reference antenna respectively based on received said pilot tone, and the channel information that will be obtained is separately notified to Serving cell; Pilot tone is sent to said reference antenna in other sub-districts, and said reference antenna is estimated the channel information of other each sub-districts to this reference antenna based on the said pilot tone that receives;

If said reference antenna is the cooperation cell reference antenna; Then said reference antenna sends pilot tone to other each sub-district reference antennas respectively; Other each sub-district reference antennas are based on the said pilot tone that receives; Estimate the channel information of said reference antenna, and the channel information that is obtained is notified to said Serving cell to this sub-district reference antenna; Other each sub-district reference antennas send pilot tone to said reference antenna, and said reference antenna is estimated the channel information of other each sub-districts to this reference antenna based on the said pilot tone that receives, and gives said Serving cell with the feedback of channel information that is obtained.

7. like claim 4,5 or 6 described methods, it is characterized in that, when said network side is calibrated the sub-district internal antenna,

Said in each sub-district; With this sub-district reference antenna is benchmark; Other antennas to outside this sub-district internal reference antenna are calibrated; Be meant: according to the correction coefficient on this sub-district reference antenna of said minizone antenna calibration acquisition, and this sub-district reference antenna that measures and the round channel information between other antennas, obtain the correction coefficient on other each antennas of this sub-district;

Wherein, measure said round channel information between this sub-district reference antenna and other antennas in such a way:

This sub-district reference antenna is to other antenna transmission pilot tones of this sub-district, and other each antennas of this sub-district are estimated the channel information of this sub-district reference antenna to this antenna based on the said pilot tone that receives; Other alignment this sub-district reference antenna in this sub-district sends pilot tone each day, and this sub-district reference antenna is estimated the channel information of other each antennas to this reference antenna based on the said pilot tone that receives.

8. method as claimed in claim 7 is characterized in that,

Said reference antenna, reference antenna through eat dishes without rice or wine, feeder line or special correcting circuit send pilot tone.

9. method as claimed in claim 8 is characterized in that,

The pilot tone of said reference antenna, reference antenna, other antenna transmission; Comprise: public guide frequency (CRS), channel state information reference signals (CSI-RS), descending demodulation pilot frequency (DMRS), detection reference signal (SRS), uplink demodulation pilot tone (DMRS) perhaps are specifically designed to the pilot signal of antenna calibration.

10. method as claimed in claim 8 is characterized in that,

Said other sub-district reference antennas comprise to the mode of said reference antenna transmission pilot tone: the mode of time-division, and promptly each sub-district is switched the mode of pilot tone separately of sending in turn; The mode that sign indicating number divides, promptly the pilot frequency sequence signal of different quadratures is used in each sub-district;

This sub-district of alignment reference antenna sends the mode of pilot tone other days in said each sub-district, comprising: the mode of time-division, and promptly each antenna switches the mode of pilot tone separately of sending in turn; The mode that sign indicating number divides, promptly each antenna uses the pilot frequency sequence signal of different quadratures.

11. each the described method like claim 1 to 6 is characterized in that,

Said antenna calibration is that employing cycle or aperiodic mode are carried out on time slot that is specifically designed to antenna calibration or subframe.

12. method as claimed in claim 11 is characterized in that,

Said time slot or the subframe that is specifically designed to antenna calibration is meant: that network and user make an appointment or through the semi-static notice of Radio Resource control (RRC) signaling, or through system information block (SIB) 2 or SIB3 signaling broadcast announcement.

13. the antenna calibration device in the time division duplex Synergistic multi-point system is characterized in that be applied to network side, said device comprises:

Antenna calibration unit, minizone is used for: the selected reference antenna, and be benchmark with said reference antenna, the reference antenna of all sub-districts is calibrated;

Sub-district internal antenna alignment unit is used for: selecting an antenna as a reference from the antenna of this sub-district, is benchmark with this sub-district reference antenna, and other antennas outside this sub-district internal reference antenna are calibrated.

14. device as claimed in claim 13 is characterized in that,

Antenna calibration unit, said minizone is used for, and the minizone antenna calibration is carried out in all sub-districts in single or a plurality of cooperation set;

Wherein, there is at least one common cell in said a plurality of cooperation set.

15. device as claimed in claim 14 is characterized in that,

The said reference antenna that antenna calibration unit, said minizone is selected comprises: the coordinate multipoint of being served (CoMP) user's antenna; Perhaps, the reference antenna of Serving cell or cooperation cell in the said cooperation set.

16. device as claimed in claim 15 is characterized in that, antenna calibration unit, said minizone is positioned at the Serving cell of said single cooperation set, or the Serving cell of one of them the cooperation set in said a plurality of cooperation set;

Antenna calibration unit, said minizone is used for, and according to selected said reference antenna, the reference antenna of all sub-districts is calibrated, and obtains the correction coefficient on each sub-district reference antenna, and notice is given respective cell.

17. device as claimed in claim 16 is characterized in that,

Antenna calibration unit, said minizone is used for, and reference antenna through measuring each sub-district and the round channel information between the said reference antenna obtain the correction coefficient on the reference antenna of said each sub-district.

18. device as claimed in claim 17 is characterized in that,

Said sub-district internal antenna alignment unit is used for; According to the correction coefficient on this sub-district reference antenna of said minizone antenna calibration acquisition; And this sub-district reference antenna that measures and the round channel information between other antennas, obtain the correction coefficient on other each antennas of this sub-district.

Images